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下游常水位水力自动控制渠道运行动态过程及数学模型的研究 被引量:13
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作者 王长德 张礼卫 《水利学报》 EI CSCD 北大核心 1997年第11期11-19,70,共10页
本文通过分析灌溉渠道中AVIO和AVIS下游常水位闸门的工作原理和运行过程,动用自动控制理论求出这两类闸门门后水位偏差和过闸流量之间的传递函数,并将之作离散化处理,再结合渠道的明渠非恒定流方程联合求解,最后可得出设置... 本文通过分析灌溉渠道中AVIO和AVIS下游常水位闸门的工作原理和运行过程,动用自动控制理论求出这两类闸门门后水位偏差和过闸流量之间的传递函数,并将之作离散化处理,再结合渠道的明渠非恒定流方程联合求解,最后可得出设置AVIO、AVIS下游常水位闸门渠道的运行动态过程.数学模型由计算机求解,可为水力自动控制系统的渠道和闸门设计提供依据,并可预测系统的运行过程与稳定性. 展开更多
关键词 自动控制 渠道 运行动态过程 灌溉 数学模型
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辽河流域中下游地区农业节水灌溉的潜力分析
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作者 张桂杰 马传波 《东北水利水电》 2005年第5期52-53,60,共3页
文章介绍了辽宁省现状水平年农业灌溉用水量,并以2000年各项发展指标为基数,对2020年农业灌溉面积、各种作物灌溉定额、灌溉需水量进行了预测。
关键词 节水灌溉 节水措施 辽河流域中下游地区
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GCL-Poly Energy Plans 20 MW PV Solar Plant, Extends Product Line
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《China Chemical Reporter》 2009年第33期12-12,共6页
GCL-Poly Energy Holding Limited (HK:0380) plans to build a 20 MW crystal siliconphotovoltaic power plant, in Xuzhoucity, Jiangsu province, it said on October26th. The power plant in Qingshanquantown, Jiawang district,... GCL-Poly Energy Holding Limited (HK:0380) plans to build a 20 MW crystal siliconphotovoltaic power plant, in Xuzhoucity, Jiangsu province, it said on October26th. The power plant in Qingshanquantown, Jiawang district, costing RMB600million, is expected to start generating powerby the end of 2009.GCL-Poly completed the acquisition 展开更多
关键词 completed Jiangsu costing DISTRICT SOLAR downstrea
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BR Market to Be Adjusted in Downturn
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作者 Lu Xiaoping 《China Chemical Reporter》 2008年第36期22-22,共4页
Supply decreasingIn recent years,the development speed ofdomestic BR(cis-1,4-polybutadienerubber) lags significantly behind SBR(styrene-butadiene rubber.).The produc-tion
关键词 BUTADIENE rubber STYRENE QUARTER creased downstrea
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Iron Oxide Sectors Suffering from Global Economic Turmoil
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作者 Lin Zhihua 《China Chemical Reporter》 2008年第33期20-20,共4页
In October 2008,impacted from the global financial turmoil,the price of chemical prod-ucts saw a drastic sudden downturn in do-mestic markets.Because the demand for
关键词 TURMOIL DOWNTURN sudden DRASTIC IMPACTED downstrea
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China's Aniline Market Will Experience a Freezing Winter in 2011
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《China Chemical Reporter》 2010年第10期23-23,共11页
Due to the global financial crisis and domesticovercapacity,in 2009 no new aniline productionline was built in China,but the country’stotal anilme capacity still remained unchanged,1.66 million t/a,of which commercia... Due to the global financial crisis and domesticovercapacity,in 2009 no new aniline productionline was built in China,but the country’stotal anilme capacity still remained unchanged,1.66 million t/a,of which commercial anilinecapacity was about 1.2 million t/a (the rest wasthe supporting aniline units of MDI plants).According to incomplete statistics,due to thepull of the demand from MDI and rubberadditives,China’s aniline output was slightlyhigher in 2009 than in 2008,reaching about 785000 tons (not including the output of the supportinganiline units of MDI plants.The followingthe same.),and the average operatingrate of aniline units in China was about 64%.With the economic rebound,in 2010China’s market demand for aniline will un- 展开更多
关键词 ANILINE REBOUND WINTER unchanged QUARTER downstrea
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Organic Chemicals Went up
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《China Chemical Reporter》 2008年第17期18-18,共4页
Pure benzene In May 2008,due to the price rise of crude oil and tense supply of pure benzene,the price of pure benzene in Asian markets was up considerably.China’s price of pure benzene rose rapidly in response to th... Pure benzene In May 2008,due to the price rise of crude oil and tense supply of pure benzene,the price of pure benzene in Asian markets was up considerably.China’s price of pure benzene rose rapidly in response to the ex-work price rise of major domestic producers.As of May 31 st pure benzene was traded at RMB10500-10600/tin eastern China,an in-crease of RMB 1450-1500/t from a month before. 展开更多
关键词 BENZENE considerably TENSE EASTERN CRUDE downstrea
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NEWSDESK
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《China Chemical Reporter》 2007年第1期5-10,共2页
On December 15th,2006 the NationalDevelopment and Reform Commis-sion (NDRC) issued an urgent notice,tentatively terminating the approvalof corn-based alcohol projects.On December 18th,2006 NDRC is-sued another notice ... On December 15th,2006 the NationalDevelopment and Reform Commis-sion (NDRC) issued an urgent notice,tentatively terminating the approvalof corn-based alcohol projects.On December 18th,2006 NDRC is-sued another notice concerning thedevelopment of the bio-fuel alcoholsector.It is emphasized in the docu-ment that China will continue toimplement the policy of "desig-nated production,orientedcirculation,open market and faircompetition"to bio-fuel alcohol.Bio-fuel alcohol projects must be exam-ined and approved by 展开更多
关键词 ALCOHOL engaged Qingdao VENTURE approved downstrea
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Prices of Organics Changed Differently
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《China Chemical Reporter》 2009年第25期18-18,共6页
MethanolIn early August, due to the increased de-mand for methanol in dimethyl ether sector,China’s methanol price rose slightly. In east-ern China, the bulk trading price of metha-nol rose to around RMB1 960/t, upRM... MethanolIn early August, due to the increased de-mand for methanol in dimethyl ether sector,China’s methanol price rose slightly. In east-ern China, the bulk trading price of metha-nol rose to around RMB1 960/t, upRMB40/t over that in mid July 2009.In mid August, the price of methanol con-tinued to increase in response to the pricerise of methanol in the international marketand the increased demand for methanol indimethyl ether sector. In eastern China, thebulk trading price of methanol rose to 展开更多
关键词 METHANOL TRADING SECTOR EASTERN slightly downstrea
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Why Is the Capacity of Polyurethane Raw Materials in Surplus?
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作者 Lu Lizhu 《China Chemical Reporter》 2009年第29期20-21,共6页
The polyurethane sector in China has developedrapidly in the past decade and theaverage annual growth is around 20%. Theoutput of polyurethane products had alreadyreached 4.50 million tons in 2008. Acomplete productio... The polyurethane sector in China has developedrapidly in the past decade and theaverage annual growth is around 20%. Theoutput of polyurethane products had alreadyreached 4.50 million tons in 2008. Acomplete production and market systemhas been formed. Polyurethane is used inevery aspect of the national economy. Ithas been especially significant in the developmentof the automotive, furniture, 展开更多
关键词 POLYURETHANE FURNITURE SECTOR automotive downstrea
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