Xem 1-20 trên 20 kết quả Environmental noise
  • In 2005 the National Academy of Engineering (NAE) held a workshop to review the present state of technology in noise control engineering. The workshop was organized by a steering committee charged with developing a prospectus for further studies of noise-related issues in the United States and to investigate how current technologies could be used to reduce exposures to noise. The issues framed by the steering committee were subsequently considered in a series of workshops held by NAE in 2007 and 2008...

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  • This book on Environmental Technology takes a look at issues such as air, soil and noise pollution problems, environmental quality assessment, monitoring, modelling and risk as- sessment, environmental health impact assessment, environmental management and envi- ronmental technology development. It represents institutional arrangements, financial mechanisms and some sustainable technologies. The user can always count on finding both introductory material and more specific material based on national interests and problems.

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  • Starting from the in situ quality of waterbodies themselves and working backwards to address threats to quality sounds like simple common sense. It is, but it is not how one would describe the current regulatory system. The focus of the current system is on specific numeric discharge limits applied to a precisely defined universe of pollution sources. The quality of surface waters themselves is a binding regulatory issue only if quality is adequately monitored and if point sources are found to be the source of the problem. Effluent taxes could play an important role in...

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  • The environment and the problems of environmental pollution are not new. The Industrial Revolution, whilst bringing prosperity to Great Britain, could be said to be the starting point for the increasing concern over environmental pollution. Early public health legislation, such as the Public Health and Clean Air Acts, endeavoured to regulate pollution to some extent, but it wasn’t until the Environmental Protection Act 1990 that any major strides were made in controlling emissions to the environmental media: air, water and land....

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  • This review of the environmental effects of freight is structured by transport mode, addressing shipping, air cargo, trucking, rail, pipelines and intermodal terminals. It begins with a brief overview of the major environmental media or mechanisms through which transport can affect the environment. These include air pollution, global climate concerns, noise, water pollution, accidents, land use and habitat fragmentation.

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  • The Heart Truth warns women about heart disease and encourages them to take action against its risk factors. The message is paired with an arresting image—the Red Dress—the national symbol for women and heart disease awareness. The symbol links a woman’s focus on her “outer self” to the need to also focus on her “inner self,” especially her heart health. The Red Dress is a visual “red alert” to convey the message that “Heart Disease Doesn’t Care What You Wear—It’s the #1 Killer of Women.”...

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  • C H A P T E R E I G H T E E N Urban Transport Policies: The Dutch Struggle with 18.1 INTRODUCTION Transport is characterized by various market failures that are of particular importance in urban settings. A basic market failure concerns environmental externalities, such as pollution and noise

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  • Motivated by the need of energy-efficiency improvements, process optimization, soft-start capability and numerous other environmental benefits, it may be desirable to operate induction motors for many applications at continuously adjustable speeds. The induction motor drives can provide high productivity with energy efficiency in different industrial applications and are the basis for modern automation. This book provides an account of this developing subject through such topics as modelling, noise, control techniques used for high-performance applications and diagnostics....

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  • The environmental goods and services  (EGS) sector has  traditionally  included solutions  for problems  such  as  air, noise  and marine pollution,  land  and water  contamination,  as well  as  activities  such  as  environmental  analysis  and  consultancy  and  waste  management  and  recycling.  However  more  recently,  the  definition  of  this  sector  has  widened.

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  • In  the  past,  environmental  goods  and  services were  seen  as  having  limited  economic  importance.  Now, environmental issues and activities pervade every aspect of our economic life and performance  and  are  subject  to  challenging  national  and  international  targets,  strict  monitoring  regimes  and  ongoing  discussion  and  debate  in  the  media.  As  understanding  of  environmental  challenges  has  grown, so too has appreciation of the size of the market and the associated business opportunities.

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  • Several countries present a series of urban problems, such as: dwelling deficit, infrastructure problems, inefficient services, environmental pollution, etc. Urban Engineering searches solution for these problems, by using a conjoined system of planning, management and technology. Many researches are related to application of instruments, methodologies and tools for monitoring and acquisition of data, based on the factual experience and computational modelling.

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  • Sensor Fusion With a specific focus for the monitoring in mind, researchers have developed over the years a wide variety of sensors and sensing strategies, each attempting to predict or detect a specific phenomenon during the operation of the process and in the presence of noise and other environmental contaminants. A good number of these sensing techniques applicable to manufacturing have been reviewed in the early part of this chapter.

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  • New material in this edition includes the latest developments in refrigerants and lubricants, together with updated information on compressors, heat exchangers, liquid chillers, electronic expansion valves, controls and cold storage. Topics also covered include efficiency, environmental impact, split systems, retail refrigeration (supermarket systems and cold rooms), industrial systems, fans, air infiltration and noise. This book is divided into 2 parts, part 1 includes the following contents: Fundamentals, the refrigeration cycle, refrigerants, compressors,...

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  • ‘Eco-procurement’ is already a key concept for operators, manufacturers and policy- makers, not least because railway rolling stock is often used for 30 years or more. Adherence to strict environmental performance specifi cations, including energy effi ciency, noise, diesel-exhaust emissions and recycling, must be considered when rail suppliers submit tenders.

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  • In addition to affecting air quality and natural environmental degradation, transportation can also play a key role in the degradation of urban environments. The delays and frustrations caused by urban traffic congestion can reduce human productivity and quality of life, thus possibly reducing the potential gross domestic or gross regional product. The noise produced by various types of motor vehicles, as well as the excessive use of horns–a fact of life in cities in many developing countries–raises the level of ambient noise, increases stress and reduces the quality of life.

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  • Tiếng ồn và âm thanh biến động áp lực âm thanh trong không khí. Cả hai đều là đặc trưng bởi mức độ âm thanh trong decibel và nội dung tần số hertz. Mặc dù âm thanh là quan trọng đối với truyền thông, tiếng ồn là một trong những vấn đề lớn nhất của chúng tôi. Cố ý tạo ra tín hiệu âm thanh bao gồm cả lời nói và âm nhạc thường được gọi là âm thanh. Tiếng ồn là một thuật ngữ được sử dụng để xác định âm thanh không mong muốn, bao gồm cả âm...

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  • Construction activities have significant potential to have adverse environmental impacts. During this phase, often a large transient workforce is employed, workforce numbers tend to peak and material and equipment movements tend to be large. Impacts are typically related to land disturbance caused by earth- works, air emissions from dust, noise from equipment and construction activities and heavy volumes of traf- fic on access roads. In many cases, specialized third party companies and consultants conduct mine construction activities.

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  • Self-sustained oscillations are perhaps the most studied objects in science. The accomplishment of such a task reliably and accurately requires the presence of specific control mechanisms to face the presence of variable and largely unpredictable environmental stimuli and noise.

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  • European urban areas face a number of environmental challenges. Although the scale and intensity of the problems vary, a common set of issues can be identified. These comprise poor air quality, traffic volumes and congestion, high levels of ambient noise and scarcity of quiet areas as sport, play and recreational areas, neglect of the built environment, high level of greenhouse gas emissions, urban sprawl and generation of large volumes of waste and waste water.

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  • An increasingly common requirement of computer systems is to extract information regarding the people present in an environment. In this article "A Survey of Human-Sensing: Methods for Detecting Presence, Count, Location, Track, and Identity "we provide a comprehensive, multi-disciplinary survey of the existing literature, focusing mainly on the extraction of five commonly needed spatiotemporal properties: Namely presence, count, location, track and identity,...

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