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有机金属卤化物钙钛矿CH_(3)NH_(3)PbBr_(3)的各向异性Rashba效应

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原子与分子物理学报 2025年第6期42卷 153-158页

作者：蔡锦鸿余达明周贤中广东工业大学集成电路学院广州510006

本研究通过密度泛函理论结合全相对论赝势对钙钛矿CH_(3)NH_(3)PbBr_(3)中的各向异性Rashba效应进行了深入研究.发现,Pb-Br八面体的畸变引起了导带最小间隙的三重态在自旋轨道耦合(SOC)效应和晶格形变下的分裂,导致在不同方向上呈现出... 详细信息

本研究通过密度泛函理论结合全相对论赝势对钙钛矿CH_(3)NH_(3)PbBr_(3)中的各向异性Rashba效应进行了深入研究.发现,Pb-Br八面体的畸变引起了导带最小间隙的三重态在自旋轨道耦合(SOC)效应和晶格形变下的分裂,导致在不同方向上呈现出强烈的各向异性.Rashba带分裂的最大系数可达2.0 eV?,并通过分析能级和电荷密度分布解释了Rashba效应的形成机制.这些研究结果有助于深化对CH_(3)NH_(3)PbBr_(3)性质的理解,同时为其在自旋电子学领域的潜在应用提供了理论基础.

关键词：钙钛矿 CH_3NH_3PbBr_3 密度泛函理论自旋轨道耦合

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多机场终端区的耦合运行分析

航空计算技术 2020年第2期50卷 46-49,54页

作者：汤先宇胡明华赵征李昌城许辰澄南京航空航天大学民航学院江苏南京211106

采用帕累托边界方法形成的容量包络面描述多机场终端区耦合运行服务能力,对关键因素建立耦合制约模型,使用直接求导的灵敏度分析方法刻画耦合程度;针对北京终端区规划方案,分析容量包络面和共用进出口点的分配与终端区运行流量、全天平... 详细信息

采用帕累托边界方法形成的容量包络面描述多机场终端区耦合运行服务能力,对关键因素建立耦合制约模型,使用直接求导的灵敏度分析方法刻画耦合程度;针对北京终端区规划方案,分析容量包络面和共用进出口点的分配与终端区运行流量、全天平均总延误的关系。实验结果表明:容量包络面可以直观地反映三场容量关系,并通过研究包络面可以找到三场耦合运行关联性,且对关键资源点的合理使用是终端区提升容量和降低延误的关键。

关键词：多机场耦合包络面关联性

Energy Trapping in Low Phase Noise Bulk Acoustic Wave Oscillators

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Chinese Physics Letters 2012年第10期29卷 15-17页

作者： HUANG xian-He WANG Yan tang Xiao-yu FU Wei School of Automation University of Electronic Science and Technology of ChinaChengdu 611731

In the design of resonators in low phase noise bulk acoustic wave(BAW)oscillators,maximization of quality factor is the primary target while energy trapping is not typically of *** shows that although energy-trapping mode energy outside the electroded region decreases exponentially with distance away from the electrode edge of the wafer,the decaying wave will reflect at the wafer edge to the electroded region and generate a wave with same frequency but different phase which generates mutual modulation with resonant *** is a source of phase noise and mainly affects the near-carrier-frequency phase *** 120 MHz SC-cut 5^(th) overtone UM-1 crystals with similar dynamic equivalent parameters and different shunt capacitances are compared using the same *** results show that energy trapping also needs to be considered in the design of resonators in low phase noise BAW oscillators.

关键词： trapping electrode phase

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急性等容血液稀释在猪肝原位移植术中的应用

四川动物 2003年第1期22卷 53-55页

作者：屈强王晓斌唐显玲丁玉辉何春水何延政泸州医学院附属医院麻醉科四川泸州646000 泸州医学院附属医院血液外科

目的—观察应用贺斯 (羟乙基淀粉注射液 ,HAES steril6 % )实施急性等容血液稀释 (ANH)对猪肝原位移植术血液动力学及凝血功能的影响。方法— 16只健康家猪 ,体重 2 0～ 30kg ,随机分为Ⅰ组 (对照组n =9)和Ⅱ组 (实验组n =7) ,在气管插... 详细信息

目的—观察应用贺斯 (羟乙基淀粉注射液 ,HAES steril6 % )实施急性等容血液稀释 (ANH)对猪肝原位移植术血液动力学及凝血功能的影响。方法— 16只健康家猪 ,体重 2 0～ 30kg ,随机分为Ⅰ组 (对照组n =9)和Ⅱ组 (实验组n =7) ,在气管插管全麻下行猪肝原位移植术。无肝期采用体外静脉转流。除常规输液输血外 ,Ⅱ组于转流前应用贺斯行ANH。术中不同时期作血液动力学、血气及生化测定。结果—两组血液动力学均较稳定 ,两组在转流期前后凝血功能无差异。结论—在猪原位肝移植术中 ,应用贺斯实施ANH对血液动力学的稳定和凝血功能无明显影响。

关键词：肝移植术血液动力学急性等容血液稀释猪羟乙基淀粉

Event-based optimization with random packet dropping

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Science China(Information Sciences) 2020年第11期63卷 175-194页

作者： Qing-Shan JIA Jing-xian tang Zhenning LANG Center for Intelligent and Networked Systems Department of AutomationTsinghua University NetEase Inc.

Event-based optimization(EBO) provides a general framework for policy optimization in many discrete event dynamic systems where decision making is triggered by events that represent state transitions with common features. Because the number of events can be defined by the user and usually increases linearly with respect to the system scale, EBO has good potential to address large-scale problems where the state space grows exponentially. However, in many practical systems, sensors are geographically distributed and connected to a central controller through imperfect communication channels. Therefore, events observed by the sensors may not reach the controller. Optimization methods of event-based policies in these cases have not yet been identified. In this paper, we consider this important problem and make three major contributions. First, we formulate a mathematical EBO model in which the communication between sensors and controllers is subject to random packet dropping. Second, we show that this EBO model can be converted to another EBO model with perfect communication. Then, the performance difference equation and the performance derivative equation for event-based policies are straightforward to develop. One gradient-based policy iteration algorithm is developed for problems where the state transition probabilities are explicitly known, while another for problems where they are unknown. Third, the performance of the algorithms and the impact of the packet dropping probability on policy performance are numerically demonstrated on a single-zone occupant level estimation problem in buildings.

关键词： event-based optimization packet dropping discrete event dynamic systems

A nonsensory odorant-binding protein plays an important role in the larval development and adult mating of Spodoptera frugiperda

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Insect Science 2023年第5期30卷 1325-1336页

作者： Wei-Kang Han Feng-xian tang Na yu Yi-Xi Zhang Ze-Wen Liu Key Laboratory of Integrated Management of Crop Diseases and Pests(Ministry of Education) College of Plant ProtectionNanjing Agricultural UniversityNanjingChina

Odorant-binding proteins (OBPs) play key roles in the perception of semiochemicals in insects. Several OBPs in insect olfactory systems have been functionally characterized, and they provide excellent targets for pest control. The functions of some OBPs that are highly expressed in the nonsensory organs of insects remain unclear. Here, the physiological function of an OBP (OBP27) that was highly expressed in the nonsensory organs of Spodoptera frugiperda was studied. OBP27 was nested within the Plus-C cluster according to phylogenetic analysis. The transcription of OBP27 steadily increased throughout the development of S. frugiperda, and transcripts of this gene were abundant in the fat body and male reproductive organs. An OBP27 knockout strain with an early frameshift mutation was obtained using the clustered regularly interspaced palindromic repeats (CRISPR) / CRISPR-associated protein 9 (Cas9) system. The development time of OBP27^(−/−) larvae was significantly longer than that of other larvae. Both male and female OBP27^(−/−) pupae weighed significantly less than wild-type (WT) pupae. In crosses of OBP27^(−/−) males or females, the mating rate was lower and the mating duration was longer for OBP27^(−/−) male–WT female pairs than for WT–WT pairs. By contrast, the mating rate, hatching rate, and number of eggs of OBP27^(−/−) female–WT male pairs and WT–WT pairs were similar. These findings indicate that OBP27 plays an important role in the larval development and mating process in male adults. Generally, our findings provide new insights into the physiological roles of nonsensory OBPs.

关键词： CRISPR/Cas9 nonsensory OBP reproduction Spodoptera frugiperda

Homoclinic Solutions for a Class of Second Order Discrete Hamiltonian Systems

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Acta Mathematica Sinica,English Series 2012年第3期28卷 609-622页

作者： xian Hua tang Xiao Yan LIN School of Mathematical Sciences and Computing Technology Central South University Department of Mathematics Huaihua College

Consider the second order discrete Hamiltonian systems

关键词： Homoclinic solution discrete Hamiltonian system critical point

The Structure and Elastic and Thermodynamic Properties of Cubic-NbH_(2) under High Pressures from First-Principles Calculations

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Chinese Physics Letters 2013年第6期30卷 161-164页

作者： LIU xian-Kun tang Bin Institute of Nuclear Physics and Chemistry China Academy of Engineering PhysicsCAEPMianyang 621900

NbH_(2) hydride is an important material in hydrogen storage ***,until now there have been no experimental and theoretical data on the elastic and thermodynamic *** structure and thermodynamic properties of cubic-NbH_(2) under high temperatures and pressure are investigated by first-principles study based on the pseudo-potential plane-wave density functional theory method using the generalized gradient approximation and quasi-harmonic Debye *** results show that the calculated structural parameters of NbH2 are in good agreement with the available experimental results and other theoretical *** obtained elastic constants satisfy the requirement for mechanical stability,indicating that the NbH_(2) crystal is stable in the investigated pressure and temperature *** the quasi-harmonic Debye model,in which the phononic effects are considered,the thermodynamic properties of NbH_(2),such as the thermal expansion coefficient and the heat capacity dependence of temperature and pressure in the ranges 0–1100K and 0–70GPa,are also obtained,respectively.

关键词： thermodynamic Debye Elastic

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甲状腺结节手术切除后中医用药规律分析

中医药导报 2017年第3期23卷 39-41,44页

作者：孙璐唐咸玉何柳张鹏何嘉莉赵晓华范冠杰广东省中医院广东广州510120 广州中医药大学广东广州510105

目的:采用回顾性研究方法分析甲状腺结节手术切除后中药用药特点。方法:收集广东省中医院2015年1—8月244例因甲状腺结节行手术切除患者的资料,包括人口学信息、结节的病理诊断、首剂中药等。结果:244例患者男女比例1∶3.9;良性结节170... 详细信息

目的:采用回顾性研究方法分析甲状腺结节手术切除后中药用药特点。方法:收集广东省中医院2015年1—8月244例因甲状腺结节行手术切除患者的资料,包括人口学信息、结节的病理诊断、首剂中药等。结果:244例患者男女比例1∶3.9;良性结节170例,良性组平均年龄(48.7±13.8)岁;恶性结节74例,恶性组平均年龄(42.0±12.7)岁;累计使用中药频次2697次,使用较多为清热药、解表药、补虚药、化痰药、理气药、活血化瘀药。聚类分析结果表明:生姜、大枣、升麻、黄芪、当归为一类,党参、白术、柴胡为一类,法半夏、茯苓、枳壳为一类,芦根、淡竹叶、淡豆豉、金银花、薄荷、连翘、牛蒡子、桔梗、荆芥为一类。结论:青年及中年人的甲状腺结节更倾向于恶变,需要手术治疗,行手术切除的甲状腺结节患者术后常见风热痰瘀之邪犯于头颈部,清热解表化痰利咽为其主要治则。

关键词：甲状腺结节手术切除中药