Volatile organic

Xem 1-20 trên 126 kết quả Volatile organic
  • Hydrogen peroxide is a strong oxidant that can be injected into a contaminated zone to destroy petroleum contaminants. When injected to groundwater, hydrogen peroxide is unstable, and reacts with organic contaminants and subsurface materials. It decomposes to oxygen and water within hours of its introduction into groundwater generating heat in the process. Peroxide is typically shipped to a remediation site in liquid form at dose concentrations ranging from five percent to 50 percent by weight.

    pdf240p cao_can 29-12-2012 28 8   Download

  • The history, culture and community values of East Africans are embedded in agriculture. It is the most important source of livelihoods for millions of East Africans. The sustainable management of the agriculture production process is therefore crucial if livelihoods are to be sustained. Organic agriculture is a holistic production management system, which promotes and enhances agro- ecosystem health, including bio-diversity, biological cycles and soil biological activity.

    pdf16p ut_hai_can 29-12-2012 24 5   Download

  • Concurrent treatment of source area saturated and unsaturated zones usually requires the integration of chemical oxidation with other remedial technologies that target unsaturated zone contamination (e.g., soil vapor extraction). Frequently, soil vapor extraction, which is used to treat the unsaturated zone, is included as a component of chemical oxidation remedial solutions even if there is no specific need to treat unsaturated soils in the source area.

    pdf73p cao_can 29-12-2012 24 3   Download

  • The current global epidemic of pulmonary tuberculosis has highlighted the need for new screening tests that are rapid and accurate. The social burden of pulmonary tuberculosis has increased because many patients are also infected with human immunodeficiency virus (HIV), and the rates of multidrug-resistant tuberculosis are increasing.1 However, screening technology has not changed greatly during the past several decades. Many highburden countries depend upon sputum smears and chest radiographs, supplemented by cultures when resources permit.

    pdf9p taisaocothedung 12-01-2013 25 3   Download

  • Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học 'Respiratory Research cung cấp cho các bạn kiến thức về ngành y đề tài:" Exhaled volatile organic compounds in patients with non-small cell lung cancer: cross sectional and nested short-term follow-up study...

    pdf10p toshiba14 22-10-2011 14 2   Download

  • Worldwide consumption of organic products has experienced tremendous growth, often surpassing the U.S. figures of 20 percent annual gain. Much of the increase in worldwide consumption has been fueled by consumers’ demand for GMO-free products. Because GMOs are disallowed in organic production and processing, organic products auto- matically are designated as GMO-free at the marketplace. European consumers have led the demand for organic products, particularly in coun- tries such as the Netherlands, Italy, and Austria.

    pdf22p cao_can 02-01-2013 20 2   Download

  • The complexity of the volatile organic compound (VOC) mixture in the Houston area makes studies of the air quality in that area very challenging. In this paper, a novel factor analysis model, where the normal chemical mass balance model was augmented by a parallel equation that accounted for wind speed and direction, temperature, and weekend/weekday effects, was fitted with a multilinear engine (ME) to provide identification and apportionment of the VOC sources at the La Porte Municipal Airport site in Houston during the Texas Air Quality Study (TexAQS) 2000.

    pdf10p cao_can 02-01-2013 22 2   Download

  • A study to measure indoor concentrations and emission rates of volatile organic compounds (VOCs), including formaldehyde, was conducted in a new, unoccupied manufactured house installed at the National Institute of Standards and Technology (NIST) campus. The house was instrumented to continuously monitor indoor temperature and relative humidity, heating and air conditioning system operation, and outdoor weather. It also was equipped with an automated tracer gas injection and detection system to estimate air change rates every 2 h.

    pdf228p ut_hai_can 29-12-2012 42 17   Download

  • Contemporary organizations face constant pressure to enhance levels of service and productivity whilst also improving levels of cost efficiency. The volatility of external environment and the rapid pace of technological change increasingly demand innovative means of improving business performance and securing competitive advantage. Human resources (HR) are increasingly recognized as the prime source of competitive advantage and the need for effective people management is therefore more important than ever before....

    pdf321p greengrass304 15-09-2012 29 9   Download

  • The chemistry of fine organic intermediates and products shows an enormous diversity. But in reality, the number of operations/processes used remains reasonably small. These include charging/discharging of reactants and solvents, inertisation, reactions, crystallisations, phase separations, filtrations, distillation, product washing. In many cases cooling, heating, or the application of vacuum or pressure is necessary. The unavoidable waste streams are treated in recovery/abatement systems or disposed of as waste.

    pdf0p cao_can 29-12-2012 41 9   Download

  • Food purchasing is an important expression of food habits. This paper therefore examines the factors associated with a household’s decision to purchase organic food products because such information is not yet available for the study area despite anecdotal evidence of the growing importance of organic products in the country. A randomly chosen sample of 200 consumers in rural and urban areas of the province’s two major regions, the former Ciskei and Transkei homeland areas, were enumerated.

    pdf11p ut_hai_can 29-12-2012 37 7   Download

  • Currently there is uncertainty about the degree of difference in nutrient composition between conventionally and organically produced foodstuffs. Organic foodstuffs are those that are produced according to specified standards which, among other things, control the use of chemicals and medicines in crop and animal production, and emphasise protection of the environment. Recently published non-systematic reviews comparing nutrient composition of organically and conventionally produced foods have come to contrasting conclusions.

    pdf61p ut_hai_can 29-12-2012 21 6   Download

  • The European Union has developed the draft of a “Working document on sludge” (EU 2000), to promote the use of sewage sludge in agriculture while improving the safety and harmonize quality standards. It proposes limit values for concentrations of heavy metals and organic compounds that should restrict the use of sewage sludge in agriculture if the limits are exceeded and provides suggestions for good practice in treatment and agricultural use.

    pdf0p ut_hai_can 29-12-2012 28 6   Download

  • Analysis was conducted on nutrients or nutrient groups for which numeric data were provided in at least 10 of the 137 crop studies identified by the review.

    pdf0p ut_hai_can 29-12-2012 19 5   Download

  • During the Uruguay Round trade negotiations, the United States and several of its major trading partners agreed to eliminate tariffs on pharmaceutical products, certain derivatives, and certain chemical intermediates used in the production of pharmaceuticals. 1 This agreement is known as the Pharmaceutical Zero-for-Zero Initiative (Initiative or Pharmaceutical Agreement).

    pdf138p cao_can 29-12-2012 23 5   Download

  • Microorganisms associated with the production of volatile compound in spoilt mango fruits sold in Sokoto town were isolated and identified. The organisms include seven species of bacteria and a species of yeast. These include Bacillus pumilus, Bacillus firmus, Brevibacillus laterosporus, Morganella morganii, Paenibacillus alvei, Staphylococcus saccharolyticus, Listeria monocytogenes and Candida krusei respectively. GC-MS analysis revealed the presence of eleven and sixteen volatile organic compound in the healthy and spoilt ripe mango fruits.

    pdf24p ut_hai_can 29-12-2012 21 4   Download

  • Petroleum contaminant decomposition and in-situ destruction may be accomplished using chemical oxidation technologies. In contrast to other remedial technologies, contaminant reduction can be seen in short time frames (e.g., weeks or months). As discussed in this chapter, a variety of chemical oxidants and application techniques can be used to bring oxidizing materials into contact with subsurface contaminants to remediate the contamination.

    pdf112p cao_can 29-12-2012 25 4   Download

  • Organic agriculture offers developing countries a wide range of economic, environment, social and cultural benefits. Global markets for certified organic products have been growing rapidly over the past two decades. In 2006, global certified organic sales were estimated to have reached over 30 billion Euros, a 20 per cent increase over 2005, and are expected to increase to 52 billion Euros by 2012 (UNEP-UNCTAD, 2008). While most sales are in North America and Europe, production is global with developing countries producing and exporting ever-increasing shares.

    pdf20p ut_hai_can 29-12-2012 21 3   Download

  • Regioregular polythiophene-based conductive copolymers with highly crystalline nanostructures are shown to hold considerable promise as the active layer in volatile organic compound (VOC) chemresistor sensors. While the regioregular polythiophene polymer chain provides a charge conduction path, its chemical sensing selectivity and sensitivity can be altered either by incorporating a second polymer to form a block copolymer or by making a random copolymer of polythiophene with different alkyl side chains.

    pdf14p cao_can 02-01-2013 24 3   Download

  • Consequently the chemical contamination builds to higher levels in these organisms. Indigenous peoples in the Arctic, whose traditional diets are heavy in fatty foods and who often have no alternatives for nourishment, thus have some of the highest recorded levels of POPs. Yet they are hundreds or thousands of kilometres from where these pesticides and industrial chemicals were released, and they certainly received little benefit from the chemicals' original use.

    pdf5p cao_can 02-01-2013 16 3   Download

Đồng bộ tài khoản