Chemical sensors

Xem 1-20 trên 33 kết quả Chemical sensors
  • The chemical sensor plays an essential role in the fields of environmental conservation and monitoring, disaster and disease prevention, and industrial analysis. A typical chemical sensor is a device that transforms chemical information in a selective and reversible way, ranging from the concentration of a specific sample component to total composition analysis, into an analytically useful signal.

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Fabrication of a Highly Sensitive Chemical Sensor Based on ZnO Nanorod Arrays

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  • This book presents a comprehensive account of recent advances and researches in fiber optic sensor technology. It consists of 21 chapters encompassing the recent progress in the subject, basic principles of various sensor types, their applications in structural health monitoring and the measurement of various physical, chemical and biological parameters.

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  • The feature of polyimides and other heterocyclic polymers are now well-established and used for long term temperature durability in the range of 250 - 350'C. This book will review synthesis, mechanisms, ultimate properties, physico-chemical properties, processing and applications of such high performance materials needed in advanced technologies. It presents interdisciplinary papers on the state of knowledge of each topic under consideration through a combination of overviews and original unpublished research.

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  • Principles of Sensors in Manufacturing sult of their relatively low cost, these are expected to be the ‘sensors of choice’ in the future. The six types of signal outputs listed above reflect the 10 basic forms of energy that sensors convert from one form to another. These are listed in Table 1.2-1 [3, 5, 6]. In practice, these 10 forms of energy are condensed into the six signal types listed as we can consider atomic and molecular energy as part of chemical energy, gravitational and mechanical as one, mechanical, and we can ignore nuclear and mass energy. The six signal...

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  • Soft sensors are a valuable tool in many different industrial fields of application, including refineries, chemical plants, cement kilns, power plants, pulp and paper industry, food processing, nuclear plants, urban and industrial pollution monitoring, just to give a few examples.

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  • Temperature is the most often-measured environmental quantity. This might be expected since most physical, electronic, chemical, mechanical and biological systems are affected by temperature.

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  • Covers important methods and recent developments in food-aroma analysis. The text discusses the problem-solving capabilities of analytical methods for food flavours and aromas, showing how to select appropriate techniques for resolving the problems of major food trends. It includes a treatment of off-flavour and malodor analyses and new polymer sensor array instruments.

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  • The extraordinary mechanical properties and unique electrical properties of carbon nanotubes (CNTs) have stimulated extensive research activities across the world since their discovery by Sumio Iijima of the NEC Corporation in the early 1990s. Although early research focused on growth and characterization, these interesting properties have led to an increase in the number of investigations focused on application development in the past 5 years.

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  • For example, because of their different jobs and schedules, women and men may be exposed to toxins in different amounts and levels. In South Africa, women are exposed more often to pesticides during planting and harvesting and men during application (London et al., 2002; Kisting in WHO, 2005). Men’s jobs in factories can involve higher exposure than women’s to toluene, a chemical solvent that can cause various problems to the reproductive and nervous systems (Neubert et al., 2001).

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  • While it has been demonstrated that these materials have good sensitivity to polar VOCs, such as alcohols and acetone, 11,12 their rather poor response to nonpolar analytes has been viewed as a major drawback. In this report, we explored two ways to improve the sensor performance of regioregular polythiophene. The first approach is to add a second polymer at the end of the polythiophene chain to form a block copolymer. This second polymer interacts with the analytes in different ways, thus adding another dimensionality to the sensing response of the material.

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  • This book collects original and innovative research studies concerning modeling and simulation of physical systems in a very wide range of applications, encompassing micro-electro-mechanical systems, measurement instrumentations, catalytic reactors, biomechanical applications, biological and chemical sensors, magnetosensitive materials, silicon photonic devices, electronic devices, optical fibers, electro-microfluidic systems, composite materials, fuel cells, indoor air-conditioning systems, active magnetic levitation systems and more.

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  • So far limit values for pollutants in sewage sludge or soils were based on background concentrations and set with the explicit political intention to avoid adverse effects. It will never be possible to derive limit values solely from scientific research. Limiting pollution so far always resulted in improvements of the environmental situation. Accordingly the continuing development of regulations is a very important matter, especially when regarded from an integrative point of view. The study tries to contribute to this attempt.

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  • Sensors are still some time away from actual mass fabrication and use. Current smartsensor prototypes, such as the Berkeley Renee Mote, have a larger footprint and are generally restricted to the following sensor types: accelerometers, microphones, light, motion and magnetometers. We envision a design inclusive of these sensors types; however, our proposed application assumes a (not so) futuristic scenario that include sensors that test for nitrates (explosives), chemical toxins, biological toxins and radiation.

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  • 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.

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  • The studies on calcium sensor calcineurin B-like protein (CBL) and CBL interacting protein kinases (CIPK) are limited to Arabidopsisand rice and their functional role is only beginning to emerge. Here, we present cloning and characterization of a protein kinase (PsCIPK) from a legume, pea, with novel properties.

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  • We have investigated mutants of phytochrome Cph1 from the cyanobacter-ium SynechocystisPCC6803 in order to study chromophore–protein inter-actions. Cph1D2, the 514-residue N-terminal sensor module produced as a recombinant His6-tagged apoprotein in Escherichia coli, autoassembles in vitro to form a holoprotein photochemically indistinguishable from the full-length product.

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  • There has been considerable debate in Canada on the relative contributions of mercury from natural sources versus releases to the environment from human activity. One of the challenges with this debate is the lack of accurate information on mercury emissions, past and present. Scientists have analyzed sediment cores and determined that the levels of mercury in the environment today are more than double what they were in pre-industrial times. They have also measured mercury in the atmosphere and found that it continues to increase globally at more than one per cent per year.

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  • The Secretary faces a number of threats. Physical threats include poisoning from radiation, chemical or bi- ological toxins. These threats are in addition to threats from explosives and individuals utilizing small arms or other military ordinance. More insidious threats are posed by collection efforts aimed at both the substance of the Secretary’s agenda and those aimed at analyzing security controls in order to compromise them in order to harm the Secretary at some later time.

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  • The Process Control settings allow you to enable additional Outpost security technologies such as Component Control, Hidden Process Control and Open Process Control. This protection is disabled by default, but if you consider your users experienced enough to manage the enormous number of network access request messages, you can enable it. Component Control monitors the components of each application to make sure they are not fake or malicious. You can set the desired Component Control level using the corresponding drop- down list. ...

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