摘要：Hydrogen production via solar water splitting is regarded as one of the most promising ways to utilize solar energy and has attracted more and more attention. Great progress has been made on photocatalytic water splitting for hydrogen production in the past few years. This review summarizesthe very recent progress (mainly in the last 2–3 years) on three major types of solar hydrogenproduction systems: particulate photocatalysis (PC) systems, photoelectrochemical (PEC) systems,and photovoltaic‐photoelectrochemical (PV‐PEC) hybrid systems. The solar‐to‐hydrogen (STH)conversion efficiency of PC systems has recently exceeded 1.0% using a SrTiO3:La,Rh/Au/BiVO4:Mophotocatalyst, 2.5% for PEC water splitting on a tantalum nitride photoanode, and reached 22.4%for PV‐PEC water splitting using a multi‐junction GaInP/GaAs/Ge cell and Ni electrode hybrid *** advantages and disadvantages of these systems for hydrogen production via solar watersplitting, especially for their potential demonstration and application in the future, are briefly describedand discussed. Finally, the challenges and opportunities for solar water splitting solutions are also forecasted.

摘要：欲望与血性是姜文电影的两大主题。《阳光灿烂的日子》、《太阳照常升起》暴露了被压抑的"文革"期女性的强烈性欲,《鬼子来了》、《让子弹飞》则分别批判了国民的奴性和张扬了人类的血性,具有鲜明的"作者电影"色彩以及当代启迪价值。

摘要：杜琪峰是上个世纪90年代后香港最具影响力的警匪电影导演之一,其作品风格独特,自成套路,表现出了"反类型"特征。笔者从文本分析出发,通过对几部代表性作品的分析,指出了杜琪峰警匪电影在人物形象、叙事模式和价值取向方面的独特倾向。

摘要：作为一部"纯情"与"反思"相结合的电影,《山楂树之恋》激起了年长观众的共鸣,但同时也遭致不少年轻观众的批评与质疑。对此,本文从观影心理和影片叙事入手,着重分析了影片的"纯"之特质及其所触及的"痛"之寓意。

摘要：本设计简要介绍了林可霉素的用途和性质,同时对林可霉素的提炼工艺进行了回顾和展望,对年产80吨盐酸林可霉素车间工艺中的主体设备之一——吸附塔进行了设计与计算。

摘要：根据蜂窝型斜管澄清技术的机理和特点,对蜂窝型斜管澄清桶进行了结构设计、工艺参数计算,并通过中间试验验证了有关技术参数,生产安装了蜂窝型斜管澄清桶,并投入使用。同时将蜂窝型斜管澄清桶和道尔型澄清桶作对比,介绍了蜂窝型澄清设备的优点。

摘要：With the continuous improvement of solar energy production capacity,how to effectively use the electricity generated by renewable solar energy for electrochemical conversion of biomass is a hot *** conversion of 5-hydroxymethylfurfural(HMF)to biofuels and value-added oxygenated commodity chemicals provides a promising and alternative pathway to convert re-newable electricity into *** nickel-based eletrocatalysts are well-known for HMF oxidation,their relatively low intrinsic activity,poor conductivity and stability still limit the poten-tial ***,we report the fabrication of a freestanding nickel-based electrode,in which Ni(OH)_(2) species were in-situ constructed on Ni foam(NF)support using a facile ac-id-corrosion-induced *** Ni(OH)2/NF electrocatalyst exhibits stable and efficient electro-chemical HMF oxidation into 2,5-furandicarboxylic acid(FDCA)with HMF conversion close to 100% with high Faraday ***-situ formation strategy results in a compact interface between Ni(OH)_(2) and NF,which contributes to good conductivity and stability during electrochemical *** superior performance benefits from dynamic cyclic evolution of Ni(OH)_(2) to NiOOH,which acts as the reactive species for HMF oxidation to FDCA.A scaled-up device based on a continu-ous-flow electrolytic cell was also established,giving stable operation with a high FDCA production rate of 27 mg h^(-1)cm^(−2).This job offers a straightforward,economical,and scalable design strategy to design efficient and durable catalysts for electrochemical conversion of valuable chemicals.

摘要：光催化苯甲醇直接脱氢制苯甲醛是一种利用太阳能合成精细化学品的同时生成氢气的节能途径。负载型半导体CdS基催化剂是该反应的一类典型的光催化剂。文献报道CdS的形貌对光催化水分解的性能有明显的影响,但其在光催化苯甲醇无氧脱氢制苯甲醛反应中的形貌效应研究报道极少。本工作合成了纳米片状(NS)和纳米线状(NW)两种不同形貌的CdS,发现CdS-NS表现出比CdS-NW更高的转化苯甲醇的光催化活性,但这两种催化剂对苯甲醛的选择性非常低。通过在CdS-NS和CdS-NW上负载Au_(25)纳米团簇,光催化苯甲醇无氧脱氢制苯甲醛反应的活性和选择性明显提高,并显著减弱了CdS载体的形貌对催化反应性能的影响。以上结果为设计合成精细化学品的高效光催化剂提供了参考。

摘要：设计了一种基于STM32的便携式家用心电检测仪。心电电极采集体表单导联心电信号,经预处理电路对心电信号进行放大、滤波和电平抬升后,送至STM32中进行模/数转换和数字处理,在液晶屏上实时显示心电波形、心率和分析结果。实验表明,该心电仪能有效提取心电信号的特征点,准确测得心率,分析出4种常见心率失常症状,并可测得HRV的时域参数。

摘要：光梗蒺藜草(Cenchrus calyculatus Cav.)为内蒙古通辽市林业外来有害生物,已经对林业及林农的生产生活构成严重的威胁。文章阐述了防治外来林业有害生物光梗蒺藜草的有效方法,以便为防治光梗蒺藜草提供有效科学依据。