Experimental study on premix combustion at isosceles triangle type rate of heat release for squish type combustion chamber

This paper presents a theory on premix fuel combustion at near isoceles triangle type rate of heat release, describes the measures taken for the combustion system, points out its many theoretical advantages, and that it can solve effectively the problems of rough running, fuel consumption and exhaust emission. Two squish lip type combustion chambers are designed to match separately with multiple holes injector and conical spray type injector in order to achieve premix combustion at near isosceles triangle type rate of heat release. Experimental studies on two single cylinder diesel engines showed that premix combustion at isosceles triangle type rate of heat release resulted in longer ignition delay period, larger amount of fuel injected into cylinder during the ignition delay period, lower maximum pressure, better fuel economy, and better exhaust emission.     

张艺谋电影创作风格论

从电影的本世界出发，张艺谋的创作风格可归纳为两点：一是浓郁，由最初的创作冲动生长晕染而成的一种氛围；二是朴拗，质朴而执拗的人物性格给影片带来的相应的表现形态。这里还探讨了形成这两种风格的原因。     

影视时代的小说阅读

文字阅读一直是小说的传统接受方式。影视艺术的产生，为小说提供了一种新的接受途径——视听感知。从此，小说接受进入文字阅读和视听感知相结合的“共读”时代。“共读”表明文字阅读和视听感知两种行为之间相互依赖、激励、阐释、补充的对话关系，反映了影视时代人类审美方式的历史性变革。     

高职林业院校森林资源保护专业“3+2”型人才培养模式探究——以辽宁林业职业技术学院为例

随着现代林业建设的快速发展,森林资源保护的相关领域对高素质综合性应用型人才的需求量不断增加。据此,根据推动高职专科与应用型本科院校的教育衔接,联合培养的相关政策性文件的指导意见,结合高职院校的教学实际,高职林业院校森林资源保护专业与本科院校应充分发挥各自优势,启动共育共享机制,初步探究并构建高职与应用型本科教育的"3+2"分段培养高级技能型人才模式,拓宽育人途径。     

对加强我国森林资源监督的思考

我国森林资源十分贫乏,在国家日益重视生态建设和各地方加快经济发展的矛盾中,加强对森林资源的监督和保护刻不容缓。森林资源监督工作的定位应是预防把关,检查督办,调研服务。     

影视艺术与文学审美的日常生活化

影视艺术的发展,使文学与新的大众传媒结合,使文学的阅读由高雅趋于平常,成为审美日常生活化的重要内容;影视艺术审美意象的营造表现出省略营造的想象空间以及通过时空变异增强抒情色彩等重要特征。     

Anomalous hopping and tunneling effects in a new aluminum film percolation system

A new aluminum thin film percolation system, deposited on glass and silicon wafer surfaces by a vapor deposition method, was investigated. By using the expansive and mobile behaviors of the silicone oil, the Al films are quenched gradually by the silicone oil during the deposition process. TheR-I behavior of the film system was studied, and the anomalous conductivity indicated that, at very low current, the hopping and tunneling effects in the films are much stronger than those of the normal film systems. Project supported by NSFC (Grant No. 19874016) and the Special Fund of Zhejiang Provincial Natural Science Foundation for Young Scientists (Grant No. 1997-RC9603).     

Chemically processed Nb-doped SrTiO3 films and properties

Homogeneous, crack-free SrNb_xTi_1−x O₃ thin films on (110) silicon substrates were successfully fabricated by sol-gel processing. The optimum route and conditions were systematically investigated. Sr(OAc)₂ glacial acctic acid solution, after being refluxed and reacted with tartrate, formed Sr(OAc)₂(C₄H₆O₆)₂; Ti(OBu)₄ formed Ti(OAc)_4−x (AcAc)_x after having the ligand partially exchanged with AcAc, while Nb(OC₂H₅)₅ formed (OAc)₂Nb(AcAc) (C₄H₆O₆) by exchanging of ligand in glacial acetic acid with (CH₃CO)₂O. All the metal species after undergoing partial hydrolysis and polymerization with hydroxyl or oxygen, formed SrNb_xTi_1−x O₁₃ cluster sol. Methyl cellulose (MCL) caused SrNb_xTi_1−x O₃ sol to have polymeric structure and easily form films. SrNb_xTi_1−x O₃ films with perovskite were subsequently formed after being annealed at 650∼750 °C for 60 min in 25% N₂+75% H₂ (volume ratio) atmosphere. Resistivity of the SrNb_0.1Ti_0.9O₃ films at room temperature was 64 μω·cm, a particular T ² temperature dependence of the resistivity, from 25 K up to room temperature, was observed. Project (No. 2002CB613305) supported by the National Basic Research Program (973) of China     

马尾松阔叶树混交林凋落物浅析

针阔混交林凋落物研究中,马×拉、马×青、马×闽、马×格、马×苦等混交群落,这5个群落以及马尾松纯林凋落物表层的化验分析结果,枯叶占优势,马×苦混交群落最高,马尾松纯林最低。营养分析A层的凋落物的N及Ca的含量最高,其平均值分别为:0.80%和1.26%,5种元素含量大小为:Ca>N>Mg或K>P。马×闽混交群落中Mg含量最小。     

二氧化钛纳米膜制备条件对炼焦厂废水光催化降解性能的影响

以四氯化钛为前驱体，用溶胶一凝胶法制备了TiO2纳米膜，并进行了炼焦厂废水的光催化降解实验，考察了制备条件对其光催化降解性能的影响。结果表明最佳工艺条件为：四氯化钛：乙醇：水=30：400：25，溶胶体系pH=7，掺铁量Fe：Ti=0．16，干凝胶在450℃煅烧2h，由此制成的TiO2纳米膜光催化降解炼焦厂废水的降解率超过79％。