摘要：利用4×4传输矩阵法,研究具有各向异性缺陷层的一维光子晶体的传输特性,指出利用该结构产生偏振正交双色缺陷模的原理,创建对偏振正交双色模间隔进行调控的方法.基于对各向异性缺陷层掺杂增益物质,研究了获得等增益偏振正交双色缺陷模的方法和条件,为两正交缺陷模在光子晶体激光器中避免模式竞争,获得双模同时谐振提供了理论指导.设计出工作在通信波长1.55μm附近的微尺寸、可调谐超大频差(0～199.8 GHz)的偏振正交双色光子晶体激光器谐振腔.

摘要：通过结合'链行走'聚合和开环聚合,合成了一系列含聚酯臂的超支化聚乙烯(HBPE-PCLs).首先使用α-二亚胺钯催化剂催化乙烯与极性单体HEA进行'链行走'共聚合,经脱保护得到结构明确的末端羟基超支化聚乙烯(HBPE-OH),然后以HBPE-OH为大分子引发剂,引发己内酯(ε-CL)单体开环聚合,合成了一系列含聚酯臂超支化聚乙烯(HBPE-PCLs).通过观察该聚合在正己烷中的自组装行为,发现其可以形成典型的囊泡结构,这种油中形成的囊泡在油溶性药物的运输与释放中存在着潜在的应用.

摘要：利用车辆运行的时空特征来解析干道绿波协调控制效果,能够深层地探索绿波协调设计的本质性原理。本文从绿波协调设计的原理出发,基于空间时距图几何元素的变换调整,提出了一种进口单独放行方式下的干道双向绿波协调控制图解法。构建了初始综合优化流程,实现了信号协调参数的初步优化设计,进一步提出了交叉口相序再优化判断准则、基于速度推进线旋转变换的公共信号周期再优化方法、基于优化判断矩阵的相位差再优化流程,并通过逐步迭代优化实现了信号相位相序、公共信号周期以及相位差的最终优化。案例分析表明,本文所提出的图解法能够快速地获得双向绿波带宽较为理想的协调控制优化方案。基于VISSIM的仿真分析表明,该方案的协调优化效果优于PBAND模型,且最终达到了正反向绿波带宽的最优值。该图解法具备设计流程清晰、优化空间连续、求解速度快的优点,同时能够获得较为理想的干道双向绿波协调优化效果,具有一定的工程应用价值。

摘要：Robust control design is presented for a general class of uncertain non-affine nonlinear systems. The design employs feedback linearization, coupled with two high-gain observers: the first to estimate the feedback linearization error based on the full state information and the second to estimate the unmeasured states of the system when only the system output is available for feedback. All the signals in the closed loop are guaranteed to be uniformly ultimately bounded(UUB) and the output of the system is proven to converge to a small neighborhood of the origin. The proposed approach not only handles the difficulty in controlling non-affine nonlinear systems but also simplifies the stability analysis of the closed loop due to its linear control structure. Simulation results show the effectiveness of the approach.

摘要：局部电荷的强离域和强偶极矩是影响共价有机框架(COFs)基光催化剂催化析氢性能的两个关键因素.然而,基于精确的调控结构模型来系统研究这种构效关系的报告相对较少.本研究提出了一种新的策略,通过合理的设计,制备了三种三芴酮基COFs,通过在分子水平上调控单体的结构和偶极来提高局部电荷离域指数.我们重点研究这三种三芴酮基COF的局部电荷离域与光催化性能之间的构效关系.在不同三芴酮基COF中,1,3,5-三(对甲酰基苯基)苯基COF(TeTpb-COF)展现出21.6 mmol g^(-1)h^(-1)的最高析氢速率,与2,4,6-三(4-醛基苯基)-1,3,5-三嗪基COF(TeTt-COF,0.2mmol g^(-1)h^(-1))相比,光催化析氢性能提高了108倍.这种性能的增强可归因于其强大的分子内置电场提高了供体-受体嵌段单元中光生电荷的有效分离效率.这项工作证实了调整构建块可以极大增强三芴酮基COFs中的局部偶极矩,从而显著改善光催化析氢性能.构建模块的调控策略为创建高效的新型COF基光催化析氢平台提供了新机会.

摘要：The combination of a zinc phthalocyanine(ZnPc)catalyst and a stoichiometric amount of dimethyl formamide(DMF)provided a simple route to formamide derivatives from amines,CO2,and hydrosilanes under mild *** deduced that formation of an active zinc‐hydrogen(Zn‐H)species promoted hydride transfer from the hydrosilane to *** cooperative activation of the Lewis acidic ZnPc by strongly polar DMF,led to formation of activated amines and hydrosilanes,which promoted the chemical reduction of ***,the binary ZnPc/DMF catalytic system showed excellent yields and superior chemoselectivity,representing a simple and sustainable pathway for the reductive transformation of CO2into valuable chemicals as an alternative to conventional halogen‐containing process.

摘要：Objective Cyclic nucleotide phosphodiesterase（PDE）is a critical component of the nitric oxide（NO）signaling pathway and plays critical roles in cognition and learning,Parkinson’s disease,attention deficit hyperactivity disorder, psychosis and *** PDEs in the brain of guinea pig have not yet been *** present study aimed to detect the unknown Pde cDNAs in the brain of guinea *** Reverse transcription polymerase chain reaction（RT-PCR）and sequence comparison analysis were performed to detect the expression of Pde cDNAs and to assess the identity rates of cDNA and amino acid sequences between guinea pig and human or mouse,*** RT-PCR primers were located on the conserved region of human PDE and mouse Pde *** Eleven novel Pde cDNAs were detected in the brain of guinea pig（Cavia porcellus）,including CpPde1a,CpPde1b,CpPde2a,CpPde4a,CpPde4d,CpPde5a,CpPde6c,CpPde7b, CpPde8a,CpPde9a,and *** identity rates of the Pde cDNA sequences between guinea pig and human ranged from 83.8%to 94.3%,and those of the amino acid sequences ranged from 91.9%to 100%.The identity rates of Pde cDNA sequences between guinea pig and mouse ranged from 84.6%to 92.1%,and those of amino acid sequences ranged from 91.2% to 99.2%.The average identity rate of the 11 Pde cDNA sequences between guinea pig and human was significantly higher（P 0.01）than that between guinea pig and *** putative partial amino acid sequences of guinea pig contained at least one of the conserved domains of human and mouse PDE *** These results indicate that the brainexpressed Pde genes are identified in guinea pig,which lays the foundation for further investigating the physiological roles of PDE proteins in the brain.

摘要：The site-specific incorporation of the noncanonical amino acid(ncAA)into proteins via genetic code expansion(GCE)has enabled the development of new and powerful ways to learn,regulate,and evolve biological functions in ***,cellular biosynthesis of ncAA-containing proteins with high efficiency and fidelity is a formidable *** this review,we summarize up-to-date progress towards improving the efficiency and orthogonality of GCE and enhancing intracellular compatibility of introduced translation machinery in the living cells by creation and optimization of orthogonal translation components,constructing genomically recoded organism(GRO),utilization of unnatural base pairs(UBP)and quadruplet codons(four-base codons),and spatial separation of orthogonal translation.

摘要：The fabrication of multicomponent heterojunctions is an effective strategy to improve the performance of TiO2 based photocatalysts. We provide a new strategy for improving the charge separation and photocatalytic performance of ZnO /TiO2 composites by the formation of multichannel charge separated heterojunctions. ZnO /P25 composites were prepared by an incipient wetness impregnation method, and applied for the photocatalytic destruction of gaseous toluene. The ZnO /P25 composites consist of anatase TiO2（ATiO2）, rutile TiO2（RTiO2） and hexagonal zincite structures. The parasitic phase of ZnO in P25 leads to the formation of ZnO（002）/ATiO2（101）/RTiO2（110） heterojunctions that exhibit enhanced light absorption and improved multichannel electron/hole separation. ZnO /P25 heterojunctions can completely oxidize toluene into CO2 and H2O under ultraviolet light irradiation at room temperature, and show enhanced photocatalytic activity in comparison with P25 owing to the efficient electron-hole separation. Such a multichannel charge separated design strategy may provide new insight into the design of highly effective photocatalysts and their potential technological applications.

摘要：Inorganic semiconductors are the essential constituents of information society, having enabled most of the devices for microelectronics, optoelectronics, new energy technology, healthcare devices, artificial intelligence,etc. From the view of condensed matter physics and materials science, inorganic semiconductors are not ***, this special class of materials are keeping inspiring new inventions and consequently new technologies,which in turn promote the design of new semiconductors. The kinds of semiconductors in nature are finite. On one hand, the new techniques need semiconductors with better properties than existing ones, on the other hand, the new computers＇ software and hardware develop so rapid that it is possible to design new semiconductors according to people＇s desire before manufacturing them. In this paper, we review the rational design of inorganic semiconductors by transformation of their elemental constituents,while maintaining their structure motifs.