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摘要:Piezocatalytic hydrogen evolution has emerged as a promising direction for the collection and utilization of mechanical energy and the efficient generation of sustainable energy throughout the *** CdS,as an established semiconductor photocatalyst,has been widely investigated for splitting water into H_(2),while its piezocatalytic performance has attracted less attention,and the relationship between the structure and piezocatalytic activity remains ***,two types of CdS nanostructures,namely CdS nanorods and CdS nanospheres,were prepared to probe the above‐mentioned *** ultrasonic vibration,the CdS nanorods afforded a superior piezocatalytic H_(2) evolution rate of 157μmol g^(−1)h^(−1)in the absence of any co‐catalyst,which is nearly 2.8 times that of the CdS *** higher piezocatalytic activity of the CdS nanorods is derived from their larger piezoelectric coefficient and stronger mechanical energy harvesting capability,affording a greater piezoelectric potential and more efficient separation and transfer of intrinsic charge carriers,as elucidated through piezoelectric response force microscopy,finite element method,and piezoelectrochemical *** study provides a new concept for the design of efficient piezocatalytic materials for converting mechanical energy into sustainable energy via microstructure regulation.
摘要:对国内音乐治疗学的相关研究进行梳理与探讨,发现其研究内容主要包括操作方法、治疗效果、作用机制和思想文化四个方面,这些研究在研究视角、研究方法、理论建构、操作技术等方面都呈现出多样性以及本土化的发展态势,逐渐将我国的音乐治疗学学科体系进行完善和扩大。尽管目前的研究已经取得了一些成果,但是部分研究在理论依据、研究方法和研究视角等方面还存在不足之处,未来的研究应探寻更加严谨的实验范式和更加多样的理论架构进一步促进本土音乐治疗学的发展。
摘要:High volumetric specific capacitance is essential for flexible *** this paper,a flexible composite electrode with ultrahigh volumetric specific capacitance and good rate performance is designed and *** film electrode is composed of non-porous compact polyaniline as the matrix and a small amount of reduced graphene oxide sheets as the conductive *** film is prepared by a newly developed solution casting method,where the casting solution is obtained by self-assembly of polyaniline and graphene oxide in a blended solution.A systematical investigation on the effect of reduced graphene oxide sheets reveals that they serve as both the conductive filler and the diffusion *** the optimized reduced graphene oxide content,a large volumetric specific capacitance of 1354 F cm^−3 at 2.4 A cm^−3 is achieved,and good rate performance is also obtained because of the good ionic conductivity of *** work provides a high performance electrode for flexible supercapacitors,and the solution casting method is also valuable in fabricating other organic electrode materials.
摘要:The hybrid waveform of linear frequency modulation and binary phase shift keying(LFM-BPSK)can take advantages of the LFM and BPSK signals,and reduce the defects of ***,with the development of interception technology for the LFM-BPSK signal,the application of the signal is *** this paper,to improve the anti-interception performance of the hybrid waveform,a new waveform of LFM-BPSK with the varying chirp rate(denoted as VCR-LFM-BPSK)is *** this design,based on the working principle of the interception frame for the LFM-BPSK signal,different chirp rates are introduced in different sub-pulses to prevent the signal from being intercepted by the ***,to further improve the anti-interception performance of the VCR-LFM-BPSK signal,the chirp rates are optimized by minimizing the interception capability of the ***,based on the VCR-LFM-BPSK signal with the optimized chirp rates,the binary phases are designed via a multiobjective Pareto optimization to improve the capabilities of autocorrelation and *** results demonstrate that the designed VCR-LFM-BPSK signal outperforms the traditional LFM-BPSK signal in countering the advanced interception technologies.
摘要:为提高医疗废弃物转运车装载率,降低回收成本,缩短回收周期,降低疾病传播和环境污染风险,提出基于回收点的医疗废弃物协作回收模式,构建了医疗废弃物协作回收车辆路径问题模型,通过优化得到最优协作回收方案,采用Shapley值法将协作回收成本合理分摊至各回收点。基于医疗废弃物待回收量和回收点位置分布,设计并求解了大量算例,以分析成本节约的影响因素。结果表明:①协作回收模式可以有效缩短回收周期,医疗废弃物待回收量较多时,回收周期缩短百分比更高,最高可达75%。②协作回收模式可以显著降低回收成本,一般情况下,成本节约百分比约为48%~88%;相同回收周期约束下,医疗废弃物待回收量较少时,成本节约更高;回收点位置分布越集中,协作带来的经济效益越高。
摘要:利润分配新规则的确定是当前经济数字化国际税收改革研究中的重点、难点与热点问题。从思维逻辑上看,用汇聚各方理论共识因素形成的"市场管辖区"概念来主张新征税权的方式,有助于搁置分歧、探寻实质性解决方案。从政策设计上看,修订的剩余利润分配法、部分分配法与基于分销的方法均或多或少突破了独立交易原则,强调了兼顾现行转让定价规则与探索简化方案之间选择的重要性。从配套规则上看,科学、合理地使用业务线与区域细分方法、限制政策适用的设计范围、妥善处理好亏损问题,都是有效实施利润分配新规则的制度性保障。通过全球在实质性简化措施的探索与细节性制度设计的共商方面作出的进一步努力,必将从根本上解决这一问题。
摘要:本文基于矩阵半张量积方法研究了带有敌对输入的异步时序机的控制问题.首先,利用矩阵半张量积,给出了带有敌对输入的异步时序机动态行为的代数表示.接着,通过分析具体的控制过程设计了具有最小状态集的控制器并给出了控制器状态转移结构矩阵和输出结构矩阵的赋值算法.其次,基于带有敌对输入的异步时序机的代数表示和控制器的赋值算法给出了整个闭环系统的动态行为的代数表示,从而验证本文理论结果的正确性.最后,利用具体实例说明了本文所提方法的的可行性和有效性.
摘要:为了构建能够有效进入血脑屏障的新型融合蛋白PTD-maxadilan(PTD-MAX),设计编码融合蛋白PTD-MAX基因,克隆到表达载体pKYB,构建重组表达载体pKYB-PTD-MAX,转化大肠杆菌ER2566中。采用IPTG诱导由PTD-MAX、内含肽和几丁质组成的融合蛋白的表达。利用IMPACT(Intein Mediated Purification with an Affinity Chitin-binding Tag)介导的纯化系统制备目的融合蛋白PTD-MAX。所得的目的蛋白经激光飞行质谱测定分子量,结果与理论值相符。动物实验结果表明融合蛋白PTD-MAX能够有效穿越血脑屏障,重组PTD-MAX具有比天然maxadilan更显著(P<0.05)的抑制小鼠摄食的作用。融合蛋白PTD-MAX的构建和制备为其生物学功能的深入开发奠定了基础。
摘要:环氧涂层在固化过程中容易出现微裂纹、缩孔、缝隙等缺陷,给腐蚀介质的渗透提供了路径,为了防止腐蚀介质渗透,从环氧树脂的分子结构设计出发,以9,9-双(4-羟苯基)芴、双酚A和环氧氯丙烷为单体,通过调节9,9-双(4-羟苯基)芴的含量,制备了一系列含有二氮芴结构的自缓蚀环氧树脂。然后通过红外、核磁、元素分析等,确定制备的树脂结构与设计结构的一致性。最后通过附着力、耐盐雾测试和EIS分析,探究其在海洋环境下的防腐性能。结果表明:二氮芴结构中的氮非配位电子和苯环的π电子能够吸附于金属表面,同时与腐蚀初期的铁离子发生缓蚀配位,有效提升了环氧树脂与基材的附着力,在3.5%NaCl溶液中浸泡60 d后阻抗值达10^(6)Ω·cm^(2),且划痕盐雾测试中锈蚀产物下降明显,具有良好的综合防腐性能。
摘要:阳离子抗菌肽(Cationic antibacterial peptides)作为自然界中广泛存在的小分子肽类活性物质,是多数生物先天免疫系统中的组成部分。多数阳离子抗菌肽具有抗菌谱广、毒副作用较低、热稳定性好、抗菌机理独特等优点。当前,阳离子抗菌肽已成为研究的热点,阳离子抗菌肽可以满足对新型抗感染药物的需求,以克服日益严重的抗生素耐药性问题。文章阐述阳离子抗菌肽的分类与作用机制,影响阳离子抗菌肽活性和选择性的可控因素,如电荷数、环化、疏水性等及其阳离子抗菌肽对家禽养殖的影响,旨在为抗菌肽的结构设计与临床利用奠定基础。
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