A drive is an adjustable speed device that regulates the speed and direction of motors. Adjustment is done by varying the current flow through the motor. Drives are classified into two broad categories based on the type of current: AC drives and DC drives. AC drives are used to control AC electric motors, while DC drives are used for DC electric motors. Drives are widely used in manufacturing industries to regulate and control electrical devices such as fans,conveyors, machine spindles, and pumps. AC drives are widely used in process industries to increase the energy efficiency of motors.

关键词：驱动；调节电机；速度；方向；调速装置；交流驱动器；直流驱动器

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At the end of 2012, U.S. wind turbines in distributed applications reached a 10-year cumulative installed capacity of more than 812 MW from more than 69,000 units across all 50 states. In 2012 alone, nearly 3,800 wind turbines totaling 175 MW of distributed wind capacity were documented in 40 states and in the U.S. Virgin Islands, with 138 MW using utility-scale turbines (i.e., greater than 1 MW in size), 19 MW using mid-size turbines (i.e., 101 kW to 1 MW in size), and 18.4 MW using small turbines (i.e., up through 100 kW in size).

关键词：风能；分布式应用；风能技术；市场报告

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In light of rising motorization, transportation planners have increasingly supported alternatives to the indiscriminate use of the car. Off-street parking policy and carsharing have emerged as credible alternatives for discouraging car ownership. This report explores an initiative that could connect these policy fields and build on their synergy: the provision of on-site carsharing service in residential developments. It evaluates the performance of on-site carsharing programs in the San Francisco Bay Area by interviewing developers, planners, and carsharing service providers. Interviews were conducted in four Bay Area cities that support the provision of carsharing as an alternative to the private automobile. Based on these interviews, this report identifies the principal factors contributing to the success or failure of on-site carsharing: the unbundling status of off-street parking in residential developments; ties to off-street parking standards; financial constraints; and the level of coordination among stakeholders. The interviews revealed that on-site carsharing has been accepted by developers, planners, and service providers, particularly in densely-populated, transit-rich communities. Nevertheless, there appears to be a gap between on-site carsharing programs and off-street parking standards, and between carsharing programs and carsharing business operations. The authors recommend that a few models for establishing carsharing policy be tested: a model designed to serve high-density cities with traditional carsharing; and another designed to serve moderately-dense communities, with new carsharing options (e.g., peer-to-peer). In the case of the latter, trip reduction can be achieved through the promotion of alternative modes along major corridors.

关键词：汽车；街边停车位；现场节目；交通规划

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关键词：混合动力车；美国；市场分析；2018

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关键词：新能源；PHEV；市场细分分析；混合动力电动汽车

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Over the six months under review, the Asia-Pacific insurance industry continued to face slower economic growth, a low interest rate environment and regulatory issues. However,the continuing rise in the number of middle class and high net worth individuals, and liberalization of trade barriers were highly favorable for the Asian insurance market.Demand for health insurance continued to grow in 2013,due to the ageing population, rising consumer affluence and strain on public resources.

关键词：亚太保险；寿险；房产

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关键词：整形外科；美国；市场分析；2018

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The Monthly Energy Review (MER) is the U.S. Energy Information Administration’s (EIA) primary report of recent and historical energy statistics. Included are statistics on total energy production,consumption, trade, and energy prices; overviews of petroleum, natural gas, coal, electricity,nuclear energy, renewable energy, and international petroleum; carbon dioxide emissions; and data unit conversions. 

关键词：能源；煤炭；电力；核能；石油

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In 2008, the National Renewable Energy Laboratory (NREL), under contract to the US Department of Energy (DOE), conducted a manufacturing readiness assessment (MRA) of fuel cell systems and fuel cell stacks for back-up power and material handling applications (MHE). To facilitate the MRA, manufacturing readiness levels (MRL) were defined that were based on the Technology Readiness Levels previously established by the US Department of Energy (DOE). NREL assessed the extensive existing hierarchy of MRLs developed by Department of Defense (DoD) and other Federal entities, and developed a MRL scale adapted to the needs of the Fuel Cell Technologies Program (FCTP) and to the status of the fuel cell industry. The MRL ranking of a fuel cell manufacturing facility increases as the manufacturing capability transitions from laboratory prototype development through Low Rate Initial Production to Full Rate Production. DOE can use MRLs to address the economic and institutional risks associated with a ramp-up in polymer electrolyte membrane (PEM) fuel cell production. In 2010, NREL updated this assessment, including additional manufacturers, an assessment of market developments since the original report, and a comparison of MRLs between 2008 and 2010.

关键词：燃料电池；后备电源;；聚合物；制氢

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HVAC control systems are required to efficiently manage HVAC equipment. They help in reducing energy consumption and enhance the performance of an HVAC unit. There are various types of HVAC control systems including sensors, field devices, floor-level controllers, and building-level controllers. These HVAC control systems are used in the Commercial and Residential sectors worldwide.

关键词：HVAC；控制系统；HVAC设备；降低能耗；提高性能

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