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Light energy

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  • Aspects of intramolecular light energy and electron transfer will be discussed for three protein-cofactor complexes, whose three-dimensional structures have been elucidated by X-ray crystallography: components of lightharvesting cyanobacterial phycobilisomes; the purple bacterial reaction centre; and the blue multi-copper oxidases. A wealth of functional data is available for these systems which allows specific correlations between structure and function and general conclusions about light energy and electron transfer in biological materials to be made.

    pdf23p byphasse043256 12-01-2019 11 0   Download

  • energy management and conservation are the keys to using fuel and electrical energy in the most efficient way. proper energy management can lead to big savings on the operating costs of a building. if fuel and electrical energy consumption are reduced, money will be saved as a result. many residential, industrial, and commercial buildings have already undergone changes that have resulted in the savings of both energy and money. any building can be made more energy efficient when proper energy management procedures are applied....

    pdf526p coeus75 29-01-2013 60 16   Download

  • Electrical energy plays an important role in our daily life. It can universally be applied and easily be converted into light, heat or mechanical energy. A general problem, however, is that electrical energy can hardly be stored. Capacitors allow its direct storage, but the quantities are small, compared to the demand of most applications. In general, the storage of electrical energy requires its conversion into another form of energy.

    pdf100p congdat261 08-11-2010 79 17   Download

  • The ConnectM Energy Management Solution is designed to help you intelligently monitor, and optimise the energy consumed by the various energy assets like lighting, HVAC, and DG sets. ConnectM also leverages the solution framework for enhancing the in-building fire and security operations.Lighting & HVAC ConnectM focuses on Energy technologies (Clean Tech) with its Energy Management Solution. Organizations spend typically about 20% of their energy on lighting, 60% on HVAC, 10% on their Datacenters and 20% on essential equipments & machineries....

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  • Organic light-emitting diodes (OLED) are playing a major role in information technology (IT) by providing the promise of further expanding the use of digital displays through making display fabrication technology lower in cost and higher in performance to replace liquid crystal displays (LCD). Due to various attractive features such as high contrast, high brightness, large color gamut and thin structure, various sized OLED displays from small-sized mobile phone display to large-sized TV display have already begun to be mass-produced....

    pdf0p ktcn_1 10-07-2012 74 11   Download

  • Lighting Controller 1. Dimming control of fluorescent lamps, mercury lamps and metal halide lamps. • More than 40% electric power saving compared with NO MERS systems. 2. Replace mercury lamp with metal halide lamp with MERS metal halide controller. • Approx. 40% electric power saving compared with NO MERS mercury lamp systems. (from Titech experiment) 3. Intelligent dimming control of lamps with MERS, sensors and Constraint Technology. • Significant saving can be expected compared with existing systems according to QOS....

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  • LIFE ON EARTH ULTIMATELY DEPENDS ON ENERGY derived from the sun. Photosynthesis is the only process of biological importance that can harvest this energy. In addition, a large fraction of the planet’s energy resources results from photosynthetic activity in either recent or ancient times (fossil fuels). This chapter introduces the basic physical principles that underlie photosynthetic energy storage and the current understanding of the structure and function of the photosynthetic apparatus (Blankenship 2002). The term photosynthesis means literally “synthesis using light.

    pdf36p anhphuonggl 11-04-2013 56 9   Download

  • HAVE YOU EVER LIFTED UP A BOARD that has been lying on a lawn for a few weeks and noticed that the grass growing underneath was much paler and spindlier than the surrounding grass? The reason this happens is that the board is opaque, keeping the underlying grass in darkness. Seedlings grown in the dark have a pale, unusually tall and spindly appearance. This form of growth, known as etiolated growth, is dramatically different from the stockier, green appearance of seedlings grown in the light (Figure 17.1). Given the key role of photosynthesis in plant metabolism, one might be tempted...

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  • (BQ) Tài liệu Daylighting Natural Light in Architecture offers a general theory and introduction to the use of natural light in architecture.Phillips makes a rational argument for considering daylight first, outlining the arguments in favour of a daylight approach, and goes on to show, through a series of beautifully illustrated case studies, how architects have created buildings in which natural light has been shown to play a major strategic role in the development of the design of a building.

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  • As I write this in the year 2002 electric vehicles (EVs) are practically irrelevant for road transport (Figure 10.1). In the year 2000 there were 109 electric cars registered in Germany out of 3,378,343 total (0.003%). Why do we talk about EVs at all? Electricity is widely used in nearly all industrial and private areas because it can be converted easily into heat, light, and motion and runs all electric devices. Electricity is convenient, clean where it is used, and economical.

    pdf20p congdat261 08-11-2010 67 6   Download

  • Harrison's Internal Medicine Chapter 57. Photosensitivity and Other Reactions to Light Solar Radiation Sunlight is the most visible and obvious source of comfort in the environment. The sun provides the beneficial effects of warmth and vitamin D synthesis; however, acute and chronic sun exposure also have pathologic consequences. Few effects of sun exposure beyond those affecting the skin have been identified, but cutaneous exposure to sunlight is the major cause of human skin cancer and can exert immunosuppressive effects as well.

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  • Anyone looking for information about power outages in Germany needs to consult the “Availability Statistics” published by the association of German electricity network operators (VDN) within the German Energy and Water Association (BDEW). This is where the power industry keeps a tally of “incidents”, by which it generally means mains power failures.

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  • MOST OF US are familiar with the observation that house plants placed near a window have branches that grow toward the incoming light. This response, called phototropism, is an example of how plants alter their growth patterns in response to the direction of incident radiation. This response to light is intrinsically different from light trapping by photosynthesis. In photosynthesis, plants harness light and convert it into chemical energy (see Chapters 7 and 8). In contrast, phototropism is an example of the use of light as an environmental signal.

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  • Biophotonics is revolutionizing the field of medicine, biology and chemistry and creating a new breed of medical engineers while at the same time getting engineers a taste of medicine. From an engineer's perspective, biophotonics is the application of photonics - the technology of generating and harnessing packet of light energy called photons - to image, detect and manipulate biological materials. In biology the understanding of molecular mechanisms, function of proteins and molecules has seen great new advances.

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  • A production tax credit (PTC) is an example of such a performance-based incentive that provides the investor or owner of an eligible renewable energy system with an annual tax credit based on the amount of electricity generated by the system. By linking the incentive to energy produced rather than capital invested, this type of incentive encourages and rewards projects based on performance.

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  • More than a third of the primary energy used in developed countries is used to heat, cool, and light buildings or is utilized within buildings. Studies have shown that commercial real estate presents opportunities to achieve substantial, relatively low-cost improvements in energy efficiency. In recent years, the European Union and its

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  • Renewable energy is shifting from the fringe to the mainstream of sustainable development. Past donor efforts achieved modest results but often were not sustained or replicated, which leads now to greater market orientation. Markets for rural household lighting with solar home systems, biogas, and small hydro power have expanded through rural entrepreneurship, government programs, and donor assistance, serving millions of households. Applications in agriculture, small industry, and social services are emerging. Public programs resulted in 220 million improved biomass cook stoves.

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  • The crisis of energy producing molecules (fuels) is expected to increase in future, which is currently produced from crude mineral oil. Biodiesel is most reliable, non-toxic, biocompatible liquid fuel that can replace the existing unsustainable sources of energy.

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  • The impacts of fuel consumption by light-duty vehicles are profound, influencing economic prosperity, national security, and Earth’s environment. Increasing energy efficiency has been a continuing and central objective for automobile manufacturers and regulators pursuing objectives that range from reducing vehicle operating costs and improving performance to reducing dependence on petroleum and limiting greenhouse gas emissions.

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  • Fujishima and Honda (1972) demonstrated the potential of titanium dioxide (TiO2) semiconductor materials to split water into hydrogen and oxygen in a photo-electrochemical cell. Their work triggered the development of semiconductor photocatalysis for a wide range of environmental and energy applications. One of the most significant scientific and commercial advances to date has been the development of visible light active (VLA) TiO2 photocatalytic materials. In this review, a background on TiO2 structure, properties and electronic properties in photocatalysis is presented.

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