Acoustical Quality And Student Learning

Good acoustical quality in classrooms is critical for student learning. Research has shown that noise exposure affects educational outcomes and provides evidence of mechanisms that explain the effects of noise on learning. Speech intelligibility studies indicate that students’ ability to recognize speech sounds is decreased by even modest levels of ambient noise, and this effect is magnified for younger children. This problem is frequently not appreciated by adults, who are better able to recognize speech in the presence of noise. Most learning activities in school classrooms, especially for younger children, involve speaking and listening as the primary communication modes: Students learn by listening to the teacher and to each other.

Excessive background noise or reverberation (i.e., multiple delayed reflections of the original sound) can interfere with speech perception and thereby impair learning. Careful attention to acoustical design requirements, then, is essential for creating an effective learning environment. Nonetheless, a 1995 report of the U.S. General Accounting Office estimated that the acoustical quality in approximately 22,000 U.S. schools attended by 11 million students was unsatisfactory. Figure 6.1 illustrates the four typical major sources of noise in classrooms and reflected speech sounds (reverberation). HVAC systems are perhaps the most common source of ambient noise in classrooms. However, significant levels of noise can also be transmitted through walls and windows from outdoors or from adjacent indoor spaces.

Reflected sound within a classroom, if uncontrolled, degrades speech intelligibility. One way to describe the desired acoustical quality in a classroom is to specify an acceptable maximum ambient noise level. This level is measured in terms of A weighted sound levels or octave band sound levels that can be used to determine other measures such as noise criterion (NC), room criterion (RC), or balanced noise criterion (BNC) values. By combining the effects of sound at different frequencies in a manner similar to that which takes place in the human hearing system, these measures rate the loudness of sound to listeners. A second way to describe acceptable room acoustical quality is to specify the reverberation time, which is approximately the time it takes for a loud sound to die awa after the source is turned off. Reverberation times increase with room volume and decrease as sound-absorbing material is added to a room. However, excessive sound-absorbing treatments will have the negative effect of reducing speech levels and degrading the intelligibility of speech in a classroom.

People’s ability to understand speech is influenced largely by how loud speech sounds are relative to ambient noise or any other competing sounds, hence the importance of an adequate signal-to-noise ratio (i.e., speech to background noise ratio) for a classroom to function well. Reverberant sound causes one word to smear into the next and can decrease the intelligibility of speech. Acoustical design should be aimed at improving the recognition of speech sounds in the classroom. The focus should be first on reducing unwanted noise. Good acoustical design can facilitate learning by allowing for more accurate verbal interaction and less repetition among teachers and students because spoken words are clearly understood. There is also evidence that good acoustical design may have a health benefit for teachers by reducing the potential for vocal impairment, and it may have the ancillary benefit of reducing teacher absenteeism. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Japanese and Rosetta Stone Korean. If you have a creative mind, you will make all your own differences in the end!

Findings And Recommendations About Green School

Finding 5a: The research findings from studies of adult populations seem to indicate clearly that the visual conditions in schools resulting from both electric lighting and natural light (daylighting) should be adequate for most children and adults, although this supposition cannot be supported by direct evidence. Finding 5b: There is concern that a significant percentage of students in classrooms do not have properly corrected eyesight, and so the general lighting conditions suitable for visual functioning by most students may be inadequate for those students who need but do not have corrective lenses. It could be hypothesized that daylight might benefit these children by providing higher light levels and better light distribution (side light) than would electric lighting alone. However, the potential advantages of daylight in classrooms for improving the visual performance of children without properly corrected eyesight has not been systematically studied.

Finding 5c: Current green school guidelines typically focus on energy-efficient lighting technologies and components and the use of daylight to further conserve energy when addressing lighting requirements. Guidance for lighting design that supports the visual performance of children and adults, based on task, school room configurations, layout, and surface finishes, is not provided. Finding 5d: Windows and clerestories can supplement electric light sources, providing high light levels, and good color rendering. Light from these sources is ever-changing and can cause glare unless appropriately managed. Currently, there is insufficient scientific evidence to determine whether or not an association exists between daylight and student achievement. Finding 5e: A growing body of evidence suggests that lighting may play an important nonvisual role in human health and well-being through the circadian system. However, little is known about the effects of lighting in schools on student achievement or health through the circadian system. Recommendation 5a: Future green school guidelines should seek to support the visual performance of students, teachers, and other adults by encouraging the design of lighting systems based on task, school room configurations, layout, and surface finishes.

Lighting system performance should be evaluated in its entirety, not solely on the source of illumination or on individual components. Recommendation 5b: Future green school guidelines for the design and application of electric lighting systems should conform to the latest published engineering practices, such as the consensus lighting recommend actions of the Illuminating Engineering Society of North America. Recommendation 5c: Green school guidelines that encourage the extensive use of daylight should address electric control systems and specify easily operated manual blinds or other types of window treatments to control excessive sunlight or glare. Recommendation 5d: Because light is important in regulating daily biological cycles, both acute effects on learning and lifelong effects on children’s health should be researched, particularly the role that lighting in school environments plays in regulating sleep and wakefulness in children. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Japanese and Rosetta Stone Korean. If you have a creative mind, you will make all your own differences in the end!

Studies Of Offices And Other Building Types

In a study of 3,720 hourly employees of a large Massachusetts manufacturer in 40 buildings with 115 independently ventilated working areas, Milton et al. analyzed the relationship between the rate at which outdoor air was supplied for ventilation and the amount of sick leave taken. The researchers found “consistent associations of increased sick leave with lower levels of outdoor air supply and IEQ [indoor environmental quality] complaints.” Seppanen and Fisk developed a further quantitative relationship by fitting the data from these epidemiological studies using the Wells-Riley model of airborne disease transmission to predict the relationship. The model predicted that there would be a decrease in illness over time with increased ventilation rates. Seppanen et al. reviewed the literature on the association of ventilation rates in nonresidential and nonindustrial buildings (primarily offices) with health and performance outcomes.

The review included 20 studies investigating the association of ventilation rates with human responses and 21 studies investigating the association of CO2 levels with human responses. A majority of studies found that ventilation rates of less than 10 L/s per person were associated in all building types with a statistically significant worsening in one or more health or perceived air quality outcomes. Some studies found that increasing ventilation rates up to 20 L/s per person was associated with significant decreases in the prevalence of building-related symptoms or with further significant improvements in perceived air quality. The ventilation rate studies reported relative risks of 1.1 for building-related symptoms at low ventilation rates and 6 at high ventilation rates. The report Clearing the Air stated: There are both theoretical evidence and limited empirical data indicating that feasible modifications in ventilation rates can decrease or increase concentrations of some of the indoor pollutants associated with asthma by up to approximately 75%. Limited or suggestive evidence exists to indicate that particle air cleaning is associated with a reduction in the exacerbation of asthma symptoms.

It should also be noted that microorganisms can grow on some air-cleaning equipment such as filter media; thus improperly maintained air cleaners are a source of indoor pollutants. The same report also stated Control options for chemical and particulate pollutants in indoor environments include source modification (removal, substitution, or emission reduction), ventilation (exhaust or dilution), or pollutant removal (filtration). The various forms of pollutant source modification are usually the most effective. For most gaseous pollutants-NO, for example-removal via air cleaning is not presently practical. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Japanese and Rosetta Stone Korean. If you have a creative mind, you will make all your own differences in the end!

Studies At School

Wargocki et al. conducted a field intervention experiment in two classes of 10-year-old children. Average air temperatures were reduced from 23.60C to 200C, and outdoor air supply rates were increased from 5.2 to 9.6 liters per second per person in a 2 x 2 crossover design, each condition lasting a week. Tasks representing eight different aspects of schoolwork, from reading to mathematics, were performed during appropriate lessons, and the children marked visual-analogue scales each week to indicate their perception of building-related symptom intensity. In this study, increased ventilation rates corresponded to increased task completion in multiplication, addition, number checking, and subtraction.

Reduced temperature corresponded to increased task completion in subtraction and reading and fewer errors in check-ing a transcript against a recorded voice reading aloud. When reduced temperature was combined with increased ventilation rates, task completion increased in a test of logical thinking. Experimental data indicated that increasing ventilation rates from 5.4 to 9.6 L/s per person and decreasing temperatures from 240C to 200C could improve the performance of schoolwork by children as measured by task completion. Smedje and Norback investigated the impact of improving school ventilation systems on allergies, asthma, and asthma symptoms in schoolchildren. They issued questionnaires to 1,476 children in 39 schools (mixed primary and secondary schools) from 1993 to 1995.

Various exposure factors were measured in 100 classrooms during this time. In 12 percent of the classrooms, new ventilation systems were installed; their effect was to increase the air-exchange rate and reduce humidity. Air pollutant levels were lower in classrooms with the new ventilation systems. This investigation indicated a health improvement for children in the classrooms with increased ventilation, lower humidity, and reduced airborne pollutants. The incidence of asthma symptoms, but not allergies, was reduced in the classrooms with the new ventilation systems. Shendell et al. (2004b) explored the association between student absences and indoor CO2 levels. These researchers noted that since measuring the actual ventilation rate is expensive and potentially problematic, the indoor concentration of CO2 has often been used as a surrogate for the ventilation rate per occupant, including in schools.

They measured the short-term (5 min) C02 levels in 409 traditional and 25 portable classrooms from 22 schools in Washington State. Attendance data were collected from school records. Their results indicated that a 1,000 parts per million (ppm) increase above the outdoor concentration of CO2 was associated with statistically significant 10 to 20 percent increases in student absences. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Japanese and Rosetta Stone Korean. If you have a creative mind, you will make all your own differences in the end!

Volatile Organic Compounds

Volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) are chemical compounds used extensively in building materials such as adhesives for wood products and structural materials, paints, and carpet adhesives. They also are found in art supplies, paints and lacquers, paint strippers, cleaning supplies, pesticides, office equipment such as copiers and printers, correction fluids and carbonless copy paper, graphics and craft materials, markers, and photographic solutions.

In fact, there are no places in schools where VOCs and SVOCs are not found. Outdoor sources of VOCs and SVOCs include fuels and combustion, biological organisms, and pesticides. Research has shown that concentrations of VOCs are consistently higher indoors than outdoors (Adgate et al., 2004; Wallace, 1991), and studies in homes suggest that indoor concentrations vary depending on the specific VOC (Weisel et al., 2005; Meng et al., 2005). One study also showed that building renovation contributes significantly to total VOC concentrations (Crump et al., 2005). Particulate matter (PM) includes solid particles ranging in size from ultrafine to relatively large. These particles come from outdoors (including dusts and particles from traffic, stationary sources, and microorganisms), and indoors (humans, building materials, fibers, bioaerosols, mold, pet dander) (Afshari et al., 2005). Larger PM remains suspended in air for relatively short periods of time, instead settling on floors, surfaces, and furnishings.

Smaller PM has longer suspension times-i.e., it remains airborne longer. Particulate matter has been implicated in a number of health effects, primarily respiratory and cardiac (Nel, 2005). Particulate matter can absorb VOCs, which may affect occupants’ health and comfort. Larger PM tends to be related to housekeeping practices, ineffective filtration by HVAC systems, and local activity. Finer PM tends to be more independent of these factors, and a fraction of finer PM will even diffuse through structures and so be not removable by HVAC filtration. One important group of PM is the airborne allergens, including molds and fungi, dander and other body fragments, dust mites, and cockroach antigens. Because these bioaerosols can induce an immune response, they are capable of causing illness at very low exposure levels and also of causing more severe respiratory disease than PM from nonbiological sources.

The strength of the association of each of these bioaerosols with illness was summarized in Clearing the Air: Asthma and Indoor Air Exposures (IOM, 2000), and many of them were found to be more strongly related to asthmatic symptoms than were moisture and mold. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone German and Rosetta Stone Hebrew. If you have a creative mind, you will make all your own differences in the end!

Outdoor Sources of Pollutants

Outdoor air pollutants can affect the health of children and adults in two ways. First, students, teachers, administrators, and support staff are exposed to outdoor pollutants before they enter a building, which can lead to increased respiratory symptoms. Second, outdoor sources of pollution can contribute to indoor air pollutant concentrations when outdoor air is drawn into a school building through air intakes located at the rooftop, at ground level, or from below-grade “wells.” Outside air also enters the building through doors, windows, ventilation shafts, and leaks in the building envelope. Mendell and Heath found that “a substantial literature of strongly designed cohort studies is available on associations between outdoor pollutants and attendance of children at school.” They concluded that there was strongly suggestive evidence that absence from school increased with exposure to ozone at higher concentrations.

However, the findings were mixed on the associations of school absence with exposure to outdoor nitrogen oxides, carbon dioxide, and particles. Site location can be an important determinant of outdoor pollutants. Schools next to high-traffic areas or with school buses idling their engines next to school doorways, windows, and air intakes may have higher levels of outdoor air pollutants being drawn indoors. Other significant sources of outdoor pollutants are plant-derived materials, or biomass, which can generate bioaerosols, including molds, fungi, and pollen. An IOM study found as follows: Although there is sufficient evidence to conclude that pollen exposure is associated with exacerbation of existing asthma in sensitized individuals, and pollen allergens have been documented in both dust and indoor air, there is inadequate or insufficient information to determine whether indoor air exposure to pollen is associated with exacerbation of asthma. The IOM study also noted that “there is relatively little information on the impact of ventilation and air cleaning measures on indoor pollen levels, although it is clear that shutting limit the entry rate of unfiltered air can windows and other measures that be effective” (p. 14). Indoor Sources of Pollutants Indoor pollutants include chemicals, allergens, volatile organic compounds (VOCs), particulate matter, and biological particles or organisms. Chemicals in indoor environments include combustion products such as nitrogen oxides (NO,,), sulfur oxides (SOX), and carbon monoxide (CO).

Combustion products can be generated by gas-fired pilot lights in kitchens and laboratories. Other sources of indoor chemical pollutants include building materials (e.g., structural materials such as particleboard, adhesives, insulation); furnishings (carpets, paints, furniture); products used in a building (cleaning materials, pesticides, markers, art supplies); and equipment (copiers and printers). Indoor allergen sources-house dust mites, pet dander, cockroaches, rodents, and seasonal pollens can be brought into a building by occupants, can be generated by furry animals kept in classrooms, or can be attracted to food sources in, for example, school kitchens and cafeterias. Daisey et al. found that a variety of bioaerosols (primarily molds and fungi, dust mites, and animal antigens) could be found in school environments. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone English and Rosetta Stone French. If you have a creative mind, you will make all your own differences in the end!

Recommendations About Students

Finding 3a: There is sufficient scientific evidence to establish an association between excess moisture, dampness, and mold in buildings and adverse health outcomes, particularly asthma and respiratory symptoms, among children and adults. Finding 3b: Excess moisture in buildings can lead to structural damage, degraded performance of building systems and components, and cosmetic damage, all of which may result in increased maintenance and repair costs. Finding 3c: Well-designed, Well-constructed, and Well-maintained building envelopes are critical to the control and prevention of excess moisture and molds. Designing for effective moisture management may also have benefits for the building, such as lower life-cycle costs. Finding 3d: Current green school guidelines typically do not adequately address the design detailing, construction, and long-term maintenance of buildings to ensure that excess moisture is controlled and a building is kept dry during its service life.

Recommendation 3a: Future green school guidelines should emphasize the control of excess moisture, dampness, and mold to protect the health of children and adults in schools and to protect a building’s structural integrity. Such guidelines should specifically address moisture control as it relates to the design, construction, operation, and maintenance of a school building’s envelope (foundations, walls, windows, and roofs) and related items such as siting and landscaping. Recommendation 3b: Research should be conducted on the moisture resistance and durability of materials used in school construction. Such research should also investigate other properties of these materials such as the generation of bioaerosols and indoor pollutants as well as the environmental impacts of producing and disposing of these materials. Indoor Air Quality, Health, and Performance Indoor air quality, which is a function of outdoor and indoor air pollutants, thermal comfort, and sensory loads (odors, “freshness”), can affect the health of children and adults and may affect student learning and teacher productivity. Pollutants are generated from many sources. Outdoor pollutants include ozone, which has been associated with absenteeism among Students.

Pollutants and allergens in indoor air-mold, dust, pet dander, bacterial and fungal products, volatile organic compounds, and particulate matter are associated with asthma and other respiratory symptoms and with a set of building-related symptoms (eye, nose, and throat irritations; headaches; fatigue; difficulty breathing; itching; and dry, irritated skin). In some cases, outdoor pollutants react with indoor chemicals to create new irritants. Thermal comfort is influenced by temperature, relative humidity, and perceived air quality (sensory loads) and has been linked to student achievement as measured by task performance. Relative humidity is also a factor in the survival rates of viruses, bacteria, and fungi and their effects on human health. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Arabic and Rosetta Stone Chinese. If you have a creative mind, you will make all your own differences in the end!

Talk About Living

Moist air also leaks into basements through floor and slab perimeters, wall joints, cracks, windows, and around drains. Winter stack forces can act to depressurize the basement area, drawing moist air into the basement through these pathways. Moist air is subsequently directed to the upper regions of a structure. Since below-grade moisture is one of the most powerful sources of moisture in conditioned spaces, building dry foundation assemblies can be one of the most effective strategies used to control interior airborne moisture.The easiest way to control diffusion is by installing vapor impermeable materials on the side of the assembly with the highest vapor pressure.

Building codes consider materials with a permeability rating of 51 to be vapor barriers. As a general rule, designers should position vapor barriers toward the inside surface in heating-dominated climates and toward the outside surface in cooling-dominated climates. Many building codes and architectural standards require seams and holes in vapor barriers to be sealed to form a continuous, uninterrupted line of protection. However, effectiveness depends on a material’s vapor permeability and surface area covered. In other words, if 95 percent of an envelope surface is covered with a vapor barrier, the barrier is 95 percent effective as a vapor diffusion retarder.This relationship provides designers and builders with some leeway, suggesting as it does that diffusion barriers need not be installed perfectly.However, in order for air barriers to be effective, they must be continuous and durable.In some cases diffusion can drive moisture through an envelope from the inside and from the outside. A structure built in a locality where a balanced mix of heating and cooling is required is one example. A foundation assembly where significant amounts of moisture exist inside and outside the envelope is another example of a situation where moisture can diffuse in both directions.

And porous claddings like masonry and wood that become rain soaked and subsequently exposed to solar radiation give rise to vapor driving inward, even in a heating-dominated climate. This type of diffusion will affect the design of vapor barriers. Buildings should be designed such that moisture can dry toward both the inside and the outside.Box 3.2 lists design measures that could be incorporated into green school guidelines to ensure appropriate moisture management as it relates to a building’s envelope. Excellent resources for proper moisture control design include The Moisture Control Handbook: Principles and Practices fo? Residential and Small Commercial Buildings by Joseph Lstiburek and John Carmody, The Building Foundation Design Handbook, and Moisture Control in Buildings. Building commissioning can also be an effective way to identify and preempt potential moisture problems in schools. In addition to bringing potential health benefits, designing for effective moisture management will probably have benefits for the building itself.

The more durable a building is, the longer its components will last. Materials in long-lived building assemblies are replaced less frequently than those in nondurable structures. This makes dry structures resource-efficient and energy-efficient, because no replacement materials need be harvested, mined, or produced, nor is energy used to make, transport, or assemble the replacement components. Dry buildings also require fewer resources and money for repair and maintenance. For example, damp surfaces cause stains and peeling paint, which necessitate frequent repainting and cleaning. For these reasons, dry buildings may have lower life-cycle costs, in addition to offering potential health benefits for occupants.More research is needed on the moisture resistance and durability of materials used in school construction. Such research should also investigate other properties of these materials, such as their generation of bioaerosols and indoor pollutants as well as the environmental impacts of producing and disposing of them.

Green School Guidelines

A consortium of state and utility leaders in California launched an effort in 2001 to develop energy and environmental standards specifically for schools. The Collaborative for High Performance Schools (CHPS, often pronounced “chips”) aims to increase the energy efficiency of California schools by marketing information, services, and incentive programs directly to school districts and designers. The CHPS Web site defines green schools as having the following 13 attributes: “healthy, comfortable, energy efficient, material efficient, water efficient, easy to maintain and operate, commissioned, environmentally responsive site, a building that teaches, safe and secure, community resource, stimulating architecture, and adaptable to changing needs” (CHPS, 2005). Green school objectives are to be achieved through guidelines that are similar to the LEED rating system but specifically geared to schools.

Similar guidelines have been issued by Washington state (WSBE, 2005) and are in development in Massachusetts and other states? Green school guidelines move well beyond design and engineering criteria for the buildings themselves, addressing land use, processes for construction and equipment installation, and operation and maintenance practices. They include design and engineering techniques to meet specific objectives: ” Locating schools near public transportation to reduce pollution and land development impacts; ” Placing a building on a site so as to minimize its environmental impact and make the most of available natural light and solar gain; ” Designing irrigation systems and indoor plumbing systems to conserve water; ” Designing energy and lighting systems to conserve fossil fuels and maximize the use of renewable resources; ” Selecting materials that are nontoxic, biodegradable, and easily recycled and that minimize the impacts on landfills and otherwise reduce waste; and ” Creating an indoor environment that provides occupants with a comfortable temperature, and good air quality, lighting, and acoustics.

Green school guidelines also recommend construction techniques to meet objectives such as the appropriate storage of materials on construction sites to avoid water damage, the reduction of waste materials and appropriate disposal to reduce resource depletion, and the introduction of commissioning practices to ensure the performance of building systems. Operation and maintenance practices to achieve good indoor environmental quality include using nontoxic cleaning products, replacing air filters in ventilation systems regularly, and establishing a long-term indoor environmental management plan. Because they follow conventional design and construction practice, current green school guidelines typically treat materials, lighting, ventilation systems, windows, and other building components as individual elements, not as interrelated systems. They allow designers to accumulate credits by optimizing certain components or systems (e.g., energy efficiency) while sub optimizing or ignoring others (health and development).

In doing so, such guidelines fail to account for the interrelationships among systems, occupants, and ongoing practices. Nor do they identify the potential need for compromises or trade-offs among design objectives in order to optimize overall building performance as it relates to multiple objectives. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone German and Rosetta Stone Hebrew. If you have a creative mind, you will make all your own differences in the end!

School Building Performance

Although most school buildings perform well when first built, their performance can and will deteriorate if the systems are not operated appropriately, if preventive maintenance programs are ineffective, or if needed maintenance and repairs are deferred. Because overall building performance is difficult to measure directly, overall building condition is often used as a surrogate. Professional organizations and governmental agencies have been reporting on the condition of the nation’s schools for 25 years. These reports consistently found that a substantial portion of the school-age population was being educated in substandard buildings. And schools with higher concentrations of students from low-income households were more likely to be in substandard condition.

In School Facilities: Condition of America’s Schools, the U.S. General Accounting Office estimated that approximately 14 million students (30 percent of all students) attended schools that needed extensive repairs or replacement (one-third of the school inventory) as of 1995. Approximately 28 million students attended schools that needed extensive repairs on one or more major building systems. The building components or features most often identified as needing attention in substandard schools were thermal control (temperature and humidity), ventilation, plumbing, roofs, exterior walls, finishes, windows, doors, electrical power, electrical lighting, life safety (fire suppression), and interior finishes and trims. The cost to make necessary repairs was estimated at more than $100 billion.

A second GAO report, School Facilities: America’s Schools Not Designed or Equipped for 21st Century, found that approximately 40 percent of the schools surveyed could not meet the functional requirements for teaching laboratory science or large groups (GAO, 1995b). About two-thirds of the schools could not support educational reform measures such as private space for counseling and testing, parental support activities, social health care, day care, and after-school care. In 2000, the NCES reported that at least 29 percent of the nation’s public elementary and secondary schools had problems with heating, ventilation, and air conditioning; 25 percent had plumbing problems; 24 percent reported problems with exterior walls, finishes, windows, and doors; and about 20 percent had less than adequate life safety, roofs, and electrical power.

About 11 million students attended school in districts reporting less-than-adequate buildings, of whom approximately 3.5 million were in schools whose condition was rated as poor, which needed to be replaced, or in which significant substandard performance was apparent (NCES, 2000). The NCES also found that: Schools in rural areas and small towns were more likely than schools in urban fringe areas and large towns to report that at least one of their environmental conditions was unsatisfactory (47 percent compared with 37 percent), Schools with the highest concentrations of households with incomes below the poverty level were more likely to report at least one unsatisfactory environmental condition than were schools with lower concentrations of low-income households (55 percent compared with 38 percent), and About one-third of school administrators were dissatisfied with the energy efficiency of their schools, and 38 percent were dissatisfied with the flexibility of instructional space. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Arabic and Rosetta Stone Chinese. If you have a creative mind, you will make all your own differences in the end!

Assessment Center Exercises

Candidates’ mastery of the content necessary for accomplished teaching in their field is assessed by means of a computer-based assessment consisting of six individual 30-minute exercises taken at a designated testing center. The board contracts with a vendor to establish centers throughout the country so that 90 percent of candidates do not need to travel more than 60 miles. Candidates can take the assessment center exercises between July 1 and June 15. The NBPTS posts scoring guides on its website to assist candidates in understanding what will be expected of them; these describe several sample exercises and provide discussion of how responses are scored. These assessment exercises focus primarily on the candidates’ knowledge of the content important for the area in which they seek certification, although some questions cover pedagogical strategies.

For the middle childhood generalist certificate, the six exercises measure the ability to support reading skills, analyze student work, and integrate the arts, as well as knowledge of science, social studies, and health. For the middle childhood and early adolescence mathematics certificate, the six exercises measure candidates’ understanding of six areas (algebra and functions, connections, data analysis, geometry, number and operation sense, and technology and manipulatives) with an emphasis on the capacity to draw inferences and apply knowledge to real-world circumstances. For example, in a sample exercise for the middle childhood generalist certificate, the candidate is asked to imagine that he or she is working with a group of third grade students of mixed ability and to read a passage and a transcription of a student’s oral reading of the passage. The candidate then responds to four prompts that explicitly ask him or her to identify errors, cite examples from the student’s text to support analysis of the student’s skills, describe strategies for addressing the errors, and provide a rationale for using these strategies.

An example from the early adolescence mathematics assessments shows a similar assessment approach in a different context. The scoring guide for this exercise, which covers data analysis, explains that candidates must present: a complete and accurate graphical representation of a given set of data; a meaningful interpretation of the data based on the graphical representation; an appropriate and accurate alternate graphical representation of the data; and a meaningful, accurate, and distinct interpretation of the data based on its alternate graphical representation. For the exercise, the candidate is provided with some data on high-grossing movies. The candidate is asked to create a box-and-whisker plot to display the data, to discuss the skewing of the data, and then to produce an alternate representation of the data and answer a question about it. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone English and Rosetta Stone French. If you have a creative mind, you will make all your own differences in the end!

Occupational Fields of Teaching

In practice, occupational fields possess these characteristics in varying degrees. Medicine, for example, could be said to meet most of these criteria and is generally regarded as a profession. Others, such as engineering, accounting, or nursing, meet fewer of them. Many occupations, such as carpentry and other building trades, and many computer and other technical fields have periods of apprenticeship and require the development of expertise that may be acquired on the job or through schooling, but they are not normally recognized as professions. Furthermore, external circumstances may affect the practice of a profession. For example, some physicians have found that rising costs and changes in the financing and administration of health care have compromised their autonomy. Box 3-2 provides information about efforts to professionalize other occupations. A review of these criteria suggests that teaching has some, but not all, of the characteristics that social scientists associate with professions, and that the task force was correct in its judgment that teaching is not a full profession.

On one hand, public school teachers are required to accumulate a body of technical expertise and usually do so in a school of education. A state-granted license is a requirement for employment in the public schools, although the field itself has only limited influence on the individual states’ requirements for licensure. Teaching is also perceived as a calling with an ethical or moral component, perhaps to an even greater degree than other professions, because it involves close relationships with children and youth. In fact, teaching has been imbued with a moral purpose in most contexts. On the other hand, teachers have been widely viewed as not possessing the degree of knowledge and expertise required of other professionals, and they do not have control over entry into the field or standards of practice. As employees of school districts and schools, public school teachers have comparatively little professional autonomy or control over the conditions in which they work. It is generally the case that teachers unions, rather than professional associations, protect and advance the interests of teachers, a situation that tends to reinforce teachers’ status as employees, not professionals. It is also worth noting that although most teachers before the 19th century were male, the field has been largely female for much of its history in the United States, and only since the 20th century has it edged toward greater gender balance (Sedlak and Schlossman, 1986). The perception of teaching as a women’s field has not enhanced its status. We note also that the goal of professionalizing teaching was articulated by the Carnegie task force and the national board at a time when professionalization was a topical concern in other fields as well.

Other fields had been pushing to join the ranks of professions; a 1964 article identified social work, veterinary medicine, school teaching, nursing, and pharmacy, among others, as “in process” of becoming professions or “borderline” (Wilensky, 1964). Sociologists and others were also devoting attention to questions about the defining characteristics of professions, determining how professionals should be trained, and the intellectual relationship between research and professional practice (Schon, 1983; Wilensky, 1964). Thus, the proponents of professionalizing teachers were part of a trend, and they also faced some resistance from those who did not view the field as intellectually rigorous enough to join the ranks of the established professions. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone Hindi and Rosetta Stone Italian. If you have a creative mind, you will make all your own differences in the end!

Certified Nursing Schools And CNA Job Duties

CNA is a health aid professional who works as a certified nursing assistant. CNA is required to help the patients and return them to their normal functions. With the growing demand of certified nursing assistants, jobs are in plenty with wide range of field and opportunities to choose from, which is projected to grow within few next years. Nursing assistants may be able to find work within a particular specialty area, which they find interesting and should look at state and private hospitals as well as nursing homes and long term care centers, home health care businesses and a variety of other medical facilities for employment.

CNA’s work under the guidance and supervision of registered nurse. They are required to look forward to patient’s basic needs such bathing, cleaning, washing, walking and eating. In order to earn a lucrative salary CNA’s are required to have CNA certification from a recognized training institute or online CNA schools as well as 2-3 years of working experience in the medical sector. The basic tasks of a CNA includes, bathing, feeding, dressing, cleaning patient’s room, help making bed and in walking. At times, they are also required to take body fluids, assisting doctors and take care of medical procedures.

Based on the type of facility the CNA is working in, their job responsibilities tend to change. Some CNA’s are required to take care of mentally retarded patients. Those living with patients in their homes are known as Home nursing aids. These patients require 24 hours care; CNA’s are required to work round the clock in shifts.
Those willing to work as a CNA are required to take up the one year nursing course that can be obtained from any local medical institution. Upon successful completion of the course the students are certified to working as certified nursing aide.
The average salary of a CNA falls between $20,000 to $ 27,000, which may vary depending upon the location for which you are chosen to work for.

Capacity Of Gis As A Support System For Spatial Thinking

For current GIS software products to support the teaching and learning of spatial thinking in the K-12 context, they must have the capacity to (I) spatialize data sets by providing spatial data structures and coding systems for nonspatial data, (2)visuahze working and final results by providing multiple forms of representation, and (3) perform functions that manipulate the structural ielations of data sets. The capacity to spatialize data sets motivates the process of spatial thinking, the capacity to visualize is integral to the process of spatial thinking, and the capacity to manipulate structural relations is the essence of spatial thinking. The following sections discuss the extent to which current GIS software products meet each of these three specific requirements of a support system for spatial thinking. Inside a typical GIS, space is defined by a combination of geometry, projection, and registration data. The structures of space and geographic data are so tightly bound in the software that they are inseparable at the application level.

This strong bond sets a GIS apart from most other kinds of information systems by providing the infrastructure necessary for the direct support of geographic operations that can be performed on that space (e.g., registration, reprojection, neighborhood and distance calculations, network analysis, spatial interpolation). Because of the bonds between space and geography, a GIS is a system that is designed to handle geographic data, but in principle, data defined in any spatial domain are also amenable to handling with GIS. The adjective geographic refers specifically to Earth’s surface and near-surface, and the more general adjective qarial refers to any space, including the space of Earth’s surface. Thus, G15 methods have been applied to nongeographic spaces, including the surfaces of other planets, the space of the cosmos, and the space of the human body. GIS has also been applied to the analysis of genome sequences of DNA. Attempts have been made to estimate the amount of data that are geographic. It is estimated that between 70 to 80 percent of the data generated and used by local government organizations are geographic (Langley et al., 2001). Local governments use geographic data to improve the quality of their products, processes, and services.

Typical GIS applications of geographic data include inventorying resources and infrastructure, planning transportation routing, improving service response time, managing land development, monitoring public health risk, and tracking crime. These applications of GIS often require databases that can easily reach a gigabyte or more in size (Table 8.2). To be used in a GIS, data must be spatialized. Spatialization is the process of attaching coordinate codes to each data item (e.g., x and y in the case of two-dimensional spatial data, or latitude and longitude in the case of two-dimensional geographic data). A GIS does a fine job of spatializing spatial data. Once spatialized, these data can he presented in a visual representation such as a thematic map. Learning things is not limited to the scentific area. Instead it also has relations with some other things like speaking a language or using software, including Rosetta Stone English and Rosetta Stone French. If you have a creative mind, you will make all your own differences in the end!

Get The Best Education – Best Educational Institutions in Ahmedabad

Education can be described as the important process that responsible to change the person’s thought skills, and responsibility. It is also responsible to bring out huge changes in the society as educated people adopt the new way to develop the society and accomplish their task effectively in comparison with unlettered people. They also transform their skills and knowledge to the new generation, so that they can also follow the same way to and give their contribution to making a well organized and developed society. Education is needed for everyone as it differentiates human being from animal.

In developing country like India, education is fully controlled by the public sector at three levels; federal, state and local level. Statistically it has been proved that India got tremendous progress in terms of offering best education. Today there are several institutions and universities such as Indian Institute of Technology, Indian Institute of Management, Delhi University, and more are quite popular among students, attract foreign students as well.

While talking about education in India, it is much needed to talk about education in Ahmedabad, a major industrial hub of the country. Ahmedabad, the capital of Gujarat, also got more reason to be popular among local as well as international students as it has some prestigious institution such as Indian Institute of Management, Mudra Institute of Communication, National Institute of Fashion Technology, and more. Such intuitions are considered a best for professional education in Ahmedabad. So it is an appropriate place for those who are keen for higher education. Besides higher education in Ahmedabad, one can also find elementary education in the city, often controlled by public as well as private sectors.

You can easily find out various public schools which are either affiliated with CBSE or ICSE board. Such schools got well recognition as they offer great atmosphere where children can develop their skills, of course quality of education makes it huge popular not only in the city, in fact all over the country. Such private schools strictly follow the rule and regulation of English medium. On the contrary schools run by public sector, controlled by the state government and affiliated with state board and emphasize on regional language rather than English.