发展农村生物质冷热电三联供的可行性分析

在介绍生物质冷热电三联供技术的基础上,分析了在农村发展生物质冷热电三联供系统的可行性及存在的问题.在农村发展该系统,在技术上是可行的,并且对建设新农村,提高能源利用率等方面都有积极作用.     

太阳能地板辐射采暖形式探讨及可行性分析

介绍了太阳能地板辐射采暖系统的特点，对其形式及原理作了简单探讨，并以济南地区太阳辐射量为参考，分析了太阳能地板辐射采暖系统的可行性，指出了该系统是完全可行、节能的一种采暖方式。     

分期建设项目水土保持设施验收工作探讨

本文以广州市某房地产项目为例，通过对水土保持防治责任范围、水土保持措施、水土保持 效果等验收结论的分析，论述分期建设项目水土保持设施验收工作的重点和难点。     

浅谈高频介质加热机的原理与维修

高频复合材加热设备，属于高频介质加热设备。由于使用方法不正确或设置环境不合理，容易造成高频介质加热设备发生故障，使设备无法正常运行。为满足生产要求，保证设备最佳运行状态，文中阐述了高频介质加热机的工作原理，对设备常见故障原因进行认真分析，就设备的技术改造和故障的维修方法进行探讨。     

地暖环境下地板甲醛释放特征研究

通过研究标准文献以及考察市场上地板产品在20℃和40℃环境下的甲醛释放量情况,得出市场上地暖地板普遍未考虑地暖环境。通过研究地板在地暖环境下的甲醛释放特征得出了温度与甲醛释放量的关系,可以为改善地暖环境和地暖地板使用过程中的环境控制提供理论依据参考。     

Is air pollution detrimental to regional innovation? Evidence from Chinese cities

Could the negative effect of air pollution be a threat to regional innovation and stunt economic growth in the most polluted Chinese cities? Considering that the generation of innovation can greatly rely on skilled workers and their productivity, this paper examines the association between air quality and regional innovation. An instrumental variable for air quality—the central heating policy—is used to address potential endogeneity problems. The results suggest a growing negative and significant impact of air pollution on city-level innovation. A corresponding mechanism analysis rules out the possibility that self-selection of skilled workers has accounted for the negative impact of air pollution on innovation and consequently infers that the productivity effects may have explained the negative impact.     

油罐冬季不加热运行的热力计算

鄯善外运油库原油罐热力系统冬季运行期间暴露了两个问题。一是水击严惩,影响油罐的运行安全;二是油罐冬季非运行期间油温过高,造成能源浪费。为妥善解决这些问题,对油罐的保温性能进行了分析,同时对油罐的伴热系统进行了热力计算。计算结果对油罐冬季退出热力运行提供了理论依据。经济分析结果表明,油罐热力系统冬季退出运行后,原油输送成本降低,节能降耗效果显著。     

The CLIMEX soil-heating experiment: soil response after 2 years of treatment

 Most model predictions concerning the response of boreal forest ecosystems to climate change are inferred from small-scale experiments on artificial, simplified systems. Whole-ecosystem experiments designed to validate these models are scarce. We experimentally manipulated a small forested catchment in southern Norway by increasing soil temperature (+3  °C in summer to +5  °C in winter) using heating cables installed at 1 cm depth in the litter layer. Especially nitrification in the 0 to 10-cm soil layer increased as a result of the climate manipulation. Betula litter, produced after exposing trees for 2 years to ambient and elevated CO₂ in greenhouses, was incubated for 1 year in the manipulated catchment. Exposure to elevated CO₂ did not affect the C/N ratio or decomposition of the Betula litter, but lignin content decreased by 10%. We found no effect of elevated temperature on litter decomposition, probably due to desiccation of the litter. The heating cables caused a permanent increase in soil temperature in this soil layer, but when soils were dry, the temperature difference between control and heated plots decreased with increasing distance from the cables. When soils were wet, no gradients in temperature increase occurred. Received: 25 November 1997     

炭化工艺对高活性木炭性能的影响

利用工业下脚料杉木屑为原料,通过一步炭化法和二步炭化法制备高活性木炭.研究认为,一步炭化法和二步炭化法均能制得微孔和中孔结构发达的活性木炭.通过对900℃下炭化样品N2吸附等温线的分析得知,一步炭化法和二步炭化法均有利于提高木炭的比表面积,制得孔隙结构发达的活性木炭,总孔容积分别为0.561和0.784 mL·g-1,且孔半径主要集中在0.6～2.0 nm之间.但总体上来说,二步炭化法制备的样品性能比一步炭化法更优,二步炭化法样品的比表面积、总孔容积、碘吸附值分别为1 288.4 m2·g-1,0.784 mL·g-1,1 038.2mg·g-1.根据X射线衍射图谱和拉曼光谱的分析可知,二步炭化法比一步炭化法更有利于活性木炭石墨状微晶的形成与生长.     

2种栽培模式对辣椒DUS测试性状表达的影响

对比大棚设施栽培和露地栽培4个辣椒测试品种,分别调查分析其33个质量性状及假质量性状和11个数量性状的表达.结果表明:质量性状和假质量性状的表达无显著差异,不同类型辣椒品种在数量性状上存在不同程度的差异,其中叶片长和叶片宽的表达差异达到极显著水平,说明冬春季在海南开展测试工作时,设施栽培与露地栽培对不同类型辣椒的测试性...