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Keywords: regulated power supply of direct current; single2ch ip m icrocomputer, digital control Abstract:This system to dc voltage source as the core, mainly AT89S52 SCM, through the keyboard controller to install dc power supply output voltage, setting stepping class can reach.01v output voltage, the range of 0-9.9 V, the maximum current 330mA for, and can show the actual pipe by digital output voltage values.

数控直流稳压电源论文关键词：论文关键词：直流稳压电源单片机数字控制论文摘要：论文摘要：本系统以直流电压源为核心，AT89S52 单片机为主控制器，通过键盘来设置直流电源的输出电压，设置步进等级可达 0.1V，输出电压范围为 0—9.9V，最大电流为 330mA，并可由液晶屏显示实际输出电压值。

First Member companies must supply all information online, the brokerage houses trading shop companies directly sharing information, listing the inventory of all member companies, and any company can supply Acting transactions; At the same time, Member companies sent representatives to the ad hoc transactions concentrated market place, through the transaction on behalf of the OTC shop clerk, transactions between the company representatives and the realization of the handover procedures, the completion of the transaction; Once all housing transactions are timely Chepai shop.

首先是各会员公司的房源信息必须全部上网，各公司直接经纪房屋买卖的门店共享信息、挂牌所有会员公司的房源，并可以代理任何一家公司房源的交易；同时，各会员公司派交易代。。。。。。

This paper analyzes both wood supply from commodity limber, peasant wood, artificial board and import lumber and demand from main building industry, peasant wood, firewood, export wood. It collect the data of log, converted timber, plywood, fiberboard, shaving board, paper and cardboard, paper pulp and wastepaper output, import and export volume from 2000 to 2005, forming the quantitative result. At last it analyses the cause that wood supply and demand breach produces and gives resolving method.

本研究对木材市场的商品材、农民自用材、人造板和进口材的供给分析以及对木材市场的主要工业建筑业用材、农民自用材和薪炭材和出口材的需求分析，并收集2000~2005年间原木、锯材、胶合板、纤维板、刨花板、纸及纸板、纸浆和废纸产量、进口量以及出口量数据，按照经验比例折算成原木量，得出各年度木材需求总量的定量分析结果，最后分析了木材供需缺口产生的原因和采取的对策。

Based on hazard analysis of using elevator to evacuate, improving measures are proposed from the self-safety of elevators, air supply, elevator partition and power supply. Finally, the safety and rationality of the model is studied. The result indicates that it is feasible to use elevators for evacuation during the initial stage of high-rise building fire.

针对火灾时使用电梯的主要危害，提出从电梯及电梯井本身的安全、送风、电梯分区及供电保障4方面的改进措施，并对火灾初期利用电梯进行人员疏散的安全合理性进行分析，结果表明在火灾初期利用电梯进行人员疏散具有一定的可行性。

When scope economies increase further to some point, supply chain cluster will be observed and the market prices in the case of supply chain cluster will be less than those in the case of independently self-making, and this result can be used to explain the widely observed phenomenon of the China price.

而当范围经济进一步增大超过另一个临界值时，不但供应链聚集会出现，而且供应链聚集下的产品市场价格要低于它们各自被独立生产时的产品市场价格，这又可以对&中国价格&的形成做出解释。

Unplug the power supply and then connected with all parts of the plugs and connections, remove the power of the fixed screw box, remove the power supply box.

然后再拔下与电源连接的所有配件的插头和连线，卸下电源盒的固定螺丝，取出电源盒。

While this kind of power supply has many disadvantages, such as low reliability, short longevity of vacuum tube, operational safety and low transfer efficiency, existing huge capacity solid induction heating power supply cannot replace them to meet industrial needs.

由于工作频率非常高(1MHz～3MHz)，现有技术成熟的大容量全固态感应加热电源几乎无法满足要求。

Theoretical analysis proves that the new power supply has high performance such as high accuracy, high efficiency, low input ripple current, excellent EMC characteristic, light weight and low cost compared with the traditional laser power supply.

在理论和仿真分析的基础上，完成了新型高性能脉冲激光电源的硬件电路系统，详细的分析了主要电路参数的确定和电源的系统具体的电路设计。

The power factor is a power supply system of an importance technique economy index sign, use electricity equipments at consume useful power of in the meantime, return have a great deal of of useless the power be send by the power supply to burden, what power factor reflection is to use electricity equipments at consume certain of have a great achievement power of in the meantime demand of have no achievement power.

功率因数是供电系统的一项重要技术经济指标，用电设备在消耗有用功率的同时，还有大量的无用功率由电源送往负荷，功率因素反映的是用电设备在消耗一定的有功功率的同时所需要的无功功率。

Therefore, the policy changes brought about by the real estate market in Beijing, the potential substantial reduction in supply will not create a Beijing housing prices up, but so could have been because of the emergence of excess supply of villas and other property types, downward trend in prices of "stop" so that Beijing's housing prices more stable.

因此，政策变化所带来的房地产市场在北京，有可能大幅度减少供应不会造成北京房价上涨，但可能是因为出现了供应过剩的别墅和其他财产的种类，向下价格趋势的&一站式&，使北京的住房价格更稳定。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。