摘要：高强化柴油机通过实现米勒循环可有效控制爆发压力,进气门晚关角的加大导致有效压缩比的进一步降低,带来启动困难的技术问题,采用可变气门相位技术可有效兼顾爆发压力与柴油机启动的关系。研究设计一种全新的电动可变气门相位控制机构模拟试验装置,该装置由无刷直流电机、少齿差型减速机构及相关的测控系统组成,可实现高响应的相位调节,调节精度为±0.116°.依据机构的特征建立系统的数学模型,对电机特性进行试验校核,分析基本调节特性,优选控制初始PID参数。开展模拟台架试验研究,验证正时基本调节特性、启动调节特性及电压影响特性。结果表明:所设计的电动可变气门正时机构可实现基本的正时角度调节,兼顾米勒循环配气相位与启动工况配气相位;启动工况下5 s即可到达最大晚关角;模拟试验条件下,蓄电池电压降低对相位角提前有较大影响,但并不影响相位角延后。

摘要：A heterojunction photocatalyst based on porous tubular g-C3N4 decorated with CdS nanoparticles was fabricated by a facile hydrothermal co-deposition *** one-dimensional porous structure of g-C3N4 provides a higher specific surface area,enhanced light absorption,and better separation and transport performance of charge carriers along the longitudinal direction,all of which synergistically contribute to the superior photocatalytic activity *** significantly enhanced catalytic efficiency is also a benefit originating from the fast transfer of photogenerated electrons and holes between g-C3N4 and CdS through a built-in electric field,which was confirmed by investigating the morphology,structure,optical properties,electrochemical properties,and photocatalytic *** degradation of rhodamine B(RhB)and photocatalytic hydrogen evolution reaction were also carried out to investigate its photocatalytic *** can be degraded completely within 60 min,and the optimum H2 evolution rate of tubular g-C3N4/CdS composite is as high as 71.6μmol h^–1,which is about 16.3 times higher than that of pure bulk *** as-prepared nanostructure would be suitable for treating environmental pollutants as well as for water splitting.

摘要：风景日戳是国家邮政管理部门统一规定的三大类邮政日戳中特种日戳之一,属于国家邮政的正规邮品,越来越受到广大集邮爱好者的青睐。为了推动风景日戳设计水平的不断提高,倡导风景日戳的规范化,增强风景日戳爱好者的鉴赏水平,发展壮大风景日戳爱好者的队伍。

摘要：考虑到电液式可变气门大多需要高响应性的电磁阀,成本高昂控制复杂,而目前市面上技术较为成熟且应用较广VVT和VVL技术,对于配气参数的调节是有限且有级的.作者设计了一种凸轮驱动的可变液压气门机构,并进行了台架试验研究.该可变液压气门机构的提前泄油量的调节可以使气门升程和关闭角同时可变,而延后压油量的调节可以使气门升程,开启角和关闭角均可变.结果表明,所设计的可变气门机构实现了气门开启角,关闭角和气门升程的配气参数全无极可变,并且该系统成本低廉、控制方便.

摘要：Narrow spectral response,low charge separation efficiency and slow water oxidation kinetics of TiO_(2)limit its application in photoelectrochemical and photocatalytic water ***,a promising organic/inorganic composite catalyst Ag/PANI/3DOMM‐TiO_(2–x)with a three‐dimensional ordered macro‐and meso‐porous(3DO MM)structure,oxygen vacancy and Ti^(3+)defects,heterojunction formation and noble metal Ag was designed based on the Z‐scheme mechanism and successfully *** Ag/PANI/3DOMM‐TiO_(2–x)ternary catalyst exhibited enhanced hydrogen production activity in both photocatalytic and photoelectrochemical water *** photocatalytic hydrogen production rate is 420.90μmol g^(–1)h^(–1),which are 19.80 times and 2.06 times higher than the commercial P25 and 3DOMM‐TiO_(2),*** the photoelectrochemical tests,the Ag/PANI/3DOMM‐TiO_(2–x)photoelectrode shows enhanced separation and transfer of carriers with a high current density of 1.55 mA cm^(–2)at equilibrium potential of 1.23 V under simulated AM 1.5 G illumination,which is approximately 5 times greater than the 3DOMM‐TiO_(2).The present work has demonstrated the promising potential of organic/inorganic Z‐scheme photocatalyst in driving water splitting for hydrogen production.

摘要：对于高强化柴油机在标定工况点附近燃烧压力高的问题,可以通过加大进气晚关角实现米勒循环,降低压缩终了时的温度和压力,有效控制燃烧压力,但同时也会造成有效压缩比降低,带来起动困难的问题。采用两段式可变气门技术,可以在启动工况和标定工况下获得理想的工作环境。设计了一种两段式可变气门机构,与传统可变配气技术相比,这种两段式电液可变气门技术通过设计两段式凸轮轴和切换机构,可以控制电磁阀开闭进行气门升程和相位的切换,具有响应迅速、控制精确和工作过程独立的优点。对该机构进行影响规律分析和运动控制的仿真和试验研究,结果表明:油压对切换速度影响较大,油压大于0.12 MPa时可稳定切换,且油压越大,切换响应性越快,而发动机转速对切换几乎没有影响。

摘要：2003年8月28日,第二届中国邮文化节在高邮市举行,高邮市邮政局特启用一组风景日戳,共12枚,直径30毫米,设计者陈景国先生。12枚风景日戳的名称分别为:“古盂城驿”、“王氏故居”(清代音韵、训诂学家王念孙。

摘要：2004年1月5日,为配合国家邮政局发行《甲申年》特种邮票,金坛市邮政局刻制启用“茅麓致猴村”风景日戳1 枚,直径30毫米,活字钉可更换日期,设计者韦长庚、汤宝璋先生。茅麓致猴村,位于金坛市茅山东麓。相传早年常有猴群出入,人猴融洽相处,戏嬉玩耍。

摘要：2004年11月6日,为祝贺“全国特色文化广场工作会议”在吴江市平望镇召开,吴江市邮政局于开幕日启用“平望小九华寺”风景日戳1枚,设计者范振涯先生。小九华寺,始建于明万历四十四年。

摘要：拙作《江苏风景日戳专辑》是由江苏省集邮协会会刊《江苏集邮》以增刊的形式于2002年4月正式出版的。集邮是我唯一的业余爱好。五十多年来,我把集邮作为自娱自乐的生活内容,数十年如一日。1998年我开始在《镇江集邮》会刊上撰写“漫话江苏风景日戳”(连载)的文章,深受邮友的欢迎。南京市风景日戳设计家蒋同伟先生来信说,江苏是我国启用风景日戳较早、较多的省份,希望你认真收集深入研究撰写成书。