RELAXATION TIME LIMITS PROBLEM FOR HYDRODYNAMIC MODELS IN SEMICONDUCTOR SCIENCE

In this article, two relaxation time limits, namely, the momentum relaxation time limit and the energy relaxation time limit are considered. By the compactness argument, it is obtained that the smooth solutions of the multidimensional nonisentropic Euler-Poisson problem converge to the solutions of an energy transport model or a drift diffusion model, respectively, with respect to different time scales.

Long-time limit behavior of the solution to an atom's master equation

We study the long-time limit behavior of the solution to an atom＇s master equation. For the first time we derive that the probability of the atom being in the α-th （α = j ＋ 1 -jz, j is the angular momentum quantum number, jz is the z-component of angular momentum） state is {（1 - K/G）/[1 - （K/G）2j＋1]}（K/G）^α-1 as t → ＋∞, which coincides with the fact that when K/G 〉 1, the larger the a is, the larger the probability of the atom being in the α-th state （the lower excited state） is. We also consider the case for some possible generaizations of the atomic master equation.

Extention of Time Limit Mandated by SIPO(as basically limited to one extention and for two months at most)

The State Intellectual Poperty Office has announcedan amendment to Sec.5,Paragrph 4.2.of Chapter 7 ofExamination Guidelines.According to the newregulations,for making a respon to an office actionduring the prosecution of a patent application,only a firstrequest for a two-month extension of time can be basicallyallowed upon payment of official fee of RMB300(aboutUSD36).For further extension after the first one,onlyanother request for one or two months,at most twomonths,would be possibly petitioned together with a copyof the client’s instructions of the further extension and

Determination of the Financing Scale,Time Limit and Returns from the Investment in BOT Projects

The key aspect to the successful implementation of BOT concept is the raising of finance by project sponsor,so financial engineering techniques and capital structuring skills are required to find the proper mix of debt and equity.The capital structure and present a model to determine the equity level from the aspects of financing scale,construction time and return on investment are analyzed.The resulting model can help the sponsor to avoid the capital risk,and offer the government a criterion to evaluate management ability of the sponsor.To show the application and availability of this model,a case study is conducted.Thus,this paper is concern with the determination of financing scale,construction time,and return on investment which would assist the sponsor to ensure that the equity level for optimal capital structure is available prior to the implementation stage in BOT project operation.

CENTRAL LIMIT THEOREMS FOR A BRANCHING RANDOM WALK WITH A RANDOM ENVIRONMENT IN TIME

We consider a branching random walk with a random environment m time, in which the offspring distribution of a particle of generation n and the distribution of the displacements of its children depend on an environment indexed by the time n. The envi- ronment is supposed to be independent and identically distributed. For A C R, let Zn（A） be the number of particles of generation n located in A. We show central limit theorems for the counting measure Zn （-） with appropriate normalization.

Quantum speed limit time and entanglement in a non-Markovian evolution of spin qubits of coupled quantum dots

Quantum speed limit time and entanglement in a system composed of coupled quantum dots are investigated.The excess electron spin in each quantum dot constitutes the physical system(qubit).Also the spin interaction is modeled through the Heisenberg model and the spins are imposed by an external magnetic field.Taking into account the spin relaxation as a non-Markovian process,the quantum speed limit and entanglement evolution are discussed.Our findings reveal that increasing the magnetic field leads to the faster quantum evolution.In addition,the temperature increment causes the longer quantum speed limit time as well as the entanglement degradation.

Quantum speed limit time of a two-level atom under different quantum feedback control

We investigate the quantum speed limit time （QSLT） of a two-level atom under quantum-jump-based feedback control or homodyne-based feedback control. Our results show that the two different feedback control schemes have different influences on the evolutionary speed. By adjusting the feedback parameters, the quantum-jump-based feedback control can induce speedup of the atomic evolution from an excited state, but the homodyne-based feedback control cannot change the evolutionary speed. Additionally, the QSLT for the whole dynamical process is explored. Under the quantum-jump-based feedback control, the QSLT displays oscillatory behaviors, which implies multiple speed-up and speed-down processes during the evolution. While, the homodyne-based feedback control can accelerate the speed-up process and improve the uniform speed in the uniform evolution process.

PHASE RETRIEVAL OF TIME-LIMITED SIGNALS

The problem of reconstructing a signalφ（x） from its magnitude ｜φ（x）] isof considerable interest to engineers and physicists. This article concerns the problem of determining a time-limited signal f with period 2π when ｜f（eix）l is known for x∈[-π,π]. It is shown that the conditions ｜g（eix）｜ = ｜f（eix）｜ and ｜g（ci（x＋b）） -g（eix）｜ =f（ei（x＋b）） - f（eix）｜, b ≠ 27π, together imply that either g = wf or g = v f, where both w and v have period b. Furthermore, if b/2π is irrational then the functions w and v b is rational then w takes the form reduce to some constants c1 and c2, respectively; ifb/2π is rational then w takes the form w=elexB1（e1x）B2（elx）and v takes the form ei（x2πN/b＋a）B1（elx）B2（elx）,where B1 and B2 are Blaschke products.

Stability and Neimark-Sacker bifurcation analysis of a food-limited population model with a time delay

In this paper,a kind of discrete delay food-limited model obtained by the Euler method is investigated,where the discrete delay τ is regarded as a parameter.By analyzing the associated characteristic equation,the linear stability of this model is studied.It is shown that Neimark-Sacker bifurcation occurs when τ crosses certain critical values.The explicit formulae which determine the stability,direction,and other properties of bifurcating periodic solution are derived by means of the theory of center manifold and normal form.Finally,numerical simulations are performed to verify the analytical results.

Quantum speed limit time of a non-Hermitian two-level system

We investigated the quantum speed limit time of a non-Hermitian two-level system for which gain and loss of energy or amplitude are present. Our results show that, with respect to two distinguishable states of the non-Hermitian system, the evolutionary time does not have a nonzero lower bound. The quantum evolution of the system can be effectively accelerated by adjusting the non-Hermitian parameter, as well as the quantum speed limit time can be arbitrarily small even be zero.

Coherence Modified for Sensitivity to Relative Phase of Real Band-Limited Time Series

As is well known, coherence does not distinguish the relative phase of a pair of real, sinusoidal time series;the coherence between them is always unity. This behavior can limit the applicability of coherence analysis in the special case where the time series are band-limited (nearly-monoch- romatic) and where sensitivity to phase differences is advantageous. We propose a simple mod-ification to the usual formula for coherence in which the cross-spectrum is replaced by its real part. The resulting quantity behaves similarly to coherence, except that it is sensitive to relative phase when the signals being compared are strongly band-limited. Furthermore, it has a useful interpretation in terms of the zero-lag cross-correlation of real band-passed versions of the time series.

连续时间完全-限定(K=2)两级轮询系统性能分析

为了实现区分网络优先级、保证公平性、提高普通站点的性能和效率,在完全-限定(K=1)两级轮询控制系统模型的基础上,提出连续时间完全-限定(K=2)两级轮询控制系统模型。在该模型中,使用限定(K=2)服务和完全服务分别对普通站点和中心站点进行服务。中心站点转换到普通站点进行服务时,使用捎带查询方式。在此基础上,采用马尔可夫链和概率母函数的数学方法建立该轮询系统模型,并推导平均排队队长和时延。利用MATLAB进行仿真实验,结果表明:理论值与仿真值误差较小,验证了理论分析的正确性;与门限-完全服务模型相比,该模型中心站点的队长和时延均小于门限-完全服务中心站点的队长和时延,具有更高的优先级;与一级完全服务和一级限定(K=2)服务模型相比,区分了优先级,性能分别提升11.7%和14.5%,说明两级服务远好于一级服务;与完全-限定(K=1)两级服务模型相比,增加了发送的数据,减少了等待时间,性能提升13.04%左右,进一步优化了普通站点的性能。

档案延期开放的判断依据与时限问题探究

文章聚焦档案延期开放判断依据与时限问题,在对现行法规性文件中档案延期开放的判断依据进行梳理后,将其分为六大类:(1)仍属于国家秘密的;(2)涉及可能危及国家安全和社会稳定信息的;(3)涉及知识产权的;(4)涉及个人信息的;(5)档案捐赠者要求延期开放或是不开放的;(6)其他按照有关法律、行政法规和国家有关规定应当延期开放的,并重点就第(2)(3)(4)类情形的延期时限问题展开了详细讨论。文章最后指出,基于避免出现永久性豁免开放情形的考虑,应设置在常规封闭时限到期后定期滚动再审的制度安排。

基于时程分析法的中美隔震设计对比研究

介绍了中国《建筑隔震设计标准》(GB/T 51408—2021)(以下简称《隔标》)和美国Minimum design loads and associated criteria for buildings and other structures(ASCE 7-16)隔震设计的相关要求,并针对基于《建筑抗震设计规范》(GB 50011—2010)(2016年版)(以下简称《抗规》)设计的某9度区近场隔震结构,进行了两国规范的设计对比。按《抗规》设计的隔震结构,仍然能满足《隔标》的设计要求。ASCE 7-16对于隔震支座考虑了老化和环境、测试、制造等因素引起的性能参数变化,并按隔震支座的上限及下限属性进行了结构设计。基于相同地震概率水准(50年超越概率2%)的设计对比研究表明,ASCE 7-16的等效侧力法计算值高于《隔标》,按ASCE 7-16要求选择的地震波反应谱明显高于《隔标》,其时程分析结果也大于中国规范,对隔震支座的性能要求更高。

钢芯铝绝缘导线融冰传热分析

为消除电网覆冰灾害,对一种嵌入绝缘层的钢芯铝绞线结构进行了融冰研究,简要介绍了其在不断电情况下,利用线路运行电流实现在线融冰技术的原理。针对该导线结构,文章从传热学角度对其融冰物理过程进行了分析,建立了无重力条件下该导线融冰时的简易数学模型,推导了该导线达到融冰稳态时,导线各部分温度分布解析式,设计定制了嵌入绝缘层的钢芯铝绞线来进行融冰实验,实验结果验证了该导线融冰的有效性和可行性。

感染性休克液体复苏完成时限对病情转归的影响

目的 探究感染性休克液体复苏完成时限对患者病情转归的影响。方法 选取2020年7月—2023年7月收治的感染性休克156例,根据液体复苏完成时限分为<1 h组68例、1~2 h组57例、≥2 h组31例。比较3组液体复苏前后急性生理和慢性健康状况评分(APACHEⅡ)、序贯器官衰竭评分(SOFA)、血流动力学指标[中心静脉压(CVP)、心指数、外周血管阻力指数(SVRI)、每搏量指数(SVI)]、血乳酸、pH值、动脉血氧分压(PaO_(2))、动脉血二氧化碳分压(PaCO_(2))、血管外肺水指数(ELWI)、肺血管通透性指数(PVPI)、血肌酐、液体复苏量,以及去甲肾上腺素应用剂量、重症监护病房(ICU)住院时间、机械通气时间、28 d生存率。结果 <1 h组、1~2 h组复苏后APACHEⅡ、SOFA评分低于≥2 h组(P<0.05);≤1 h组、1~2 h组复苏后APACHEⅡ、SOFA评分无明显差异(P>0.05);<1 h组、1~2 h组复苏后CVP、心指数、SVI高于≥2 h组,SVRI低于≥2 h组(P<0.05);<1 h组、1~2 h组复苏后CVP、心指数、SVRI、SVI比较无明显差异(P>0.05)。<1 h组、1~2 h组复苏后血乳酸低于≥2 h组(P<0.05);<1 h组、1~2 h组复苏后血乳酸比较无明显差异(P>0.05);3组复苏后血pH值、PaO_(2)、PaCO_(2)比较无明显差异(P>0.05)。<1 h组复苏后ELWI、PVPI、血肌酐高于复苏前,并高于1~2 h组、≥2 h组(P<0.05);3组1 h液体复苏量比较无明显差异(P>0.05),<1 h组、1~2 h组、≥2 h组3 h液体复苏量呈依次降低趋势(P<0.05)。≥2 h组去甲肾上腺素剂量高于<1 h组、1~2 h组(P<0.05);<1 h组ICU住院时间、机械通气时间长于1~2 h组、≥2 h组(P<0.05)。1~2 h组、≥2 h组28 d生存率高于<1 h组(P<0.05,P<0.01)。结论 感染性休克患者初始液体复苏应在1~2 h内完成,能有效改善器官功能障碍和病情,维持血流动力学水平,加快恢复进程,促进病情良好转归。

基于量子Bernoulli噪声的一维时空非齐次开放量子游荡

用量子Bernoulli噪声方法研究一维时空非齐次开放量子游荡,给出该游荡的演化性质以及极限概率分布,并表明以局部基态作为初始态时,基于量子Bernoulli噪声的一维时空非齐次开放量子游荡具有与经典随机游荡相同的极限概率分布.

论自动投案的时间限制标准认定

符合自动投案的时间限制是自动投案成立的前提和关键,但是目前理论界对于自动投案时间的限制并没有形成一个统一的标准,部分满足法律规定的行为却不符合自动投案的实质,有必要确立一个自动投案时限的实质性标准来填补理论上的空缺。当前,法律规定中的归案标准无法穷尽所有情形,也忽视了抓捕行为对自由意志的影响,致使自动投案的认定存在诸多争议。通过引入控制的概念对归案标准进行明确,以司法机关宣告实施控制作为时限的补充,提出自动投案的时间限制标准。

PDCA循环法对急诊标本周转时间合格率的影响

目的探讨运用PDCA循环法后,急诊检验标本周转时间(TAT)合格率的变化。方法统计分析西北妇女儿童医院医学检验中心2022年1月至4月共8455例急诊标本报告,统计标本TAT合格率并采用鱼骨图分析不合格原因及处理措施;统计运用PDCA循环法后2022年5月至2023年1月共20140例急诊标本报告,比较PDCA循环法实施前后急诊标本TAT合格率的变化。结果PDCA实施后,急诊标本TAT合格率高于PDCA实施前,差异有高度统计学意义(P<0.001)。其中不同急诊项目中,除免疫发光外,急诊血常规、尿常规、粪常规、血凝四项和生化标本TAT合格率均较PDCA循环前升高,差异有高度统计学意义(P<0.001)。结论通过PDCA循环管理法,西北妇女儿童医院医学检验中心急诊标本TAT合格率得到了明显提升,这不仅提升了检验效率和临床服务,同时对急、危重患者的及时救治具有重要意义。