Level crossing in a two-photon Jaynes-Cummings model

In this paper,the energy spectrum of the two-photon Jaynes-Cummings model（TPJCM） is calculated exactly in the non-rotating wave approximation（non-RWA）,and we study the level-crossing problem by means of fidelity.A narrow peak of the fidelity is observed at the level-crossing point,which does not appear at the avoided-crossing point.Therefore fidelity is perfectly suited for detecting the level-crossing point in the energy spectrum.

Buckling Optimization of Curved Grid Stiffeners through the Level Set Based Density Method

Stiffened structures have great potential for improvingmechanical performance,and the study of their stability is of great interest.In this paper,the optimization of the critical buckling load factor for curved grid stiffeners is solved by using the level set based density method,where the shape and cross section(including thickness and width)of the stiffeners can be optimized simultaneously.The grid stiffeners are a combination ofmany single stiffenerswhich are projected by the corresponding level set functions.The thickness and width of each stiffener are designed to be independent variables in the projection applied to each level set function.Besides,the path of each single stiffener is described by the zero iso-contour of the level set function.All the single stiffeners are combined together by using the p-norm method to obtain the stiffener grid.The proposed method is validated by several numerical examples to optimize the critical buckling load factor.

Safety Assessment of Closed-Loop Level Crossing Control Systems by Means of STAMP(Systems-Theoretic Accident Model and Processes)

There have been a large number of accidents at level crossings of railways and this has been considered to be a significant issue to be solved for the realization of safe and stable railway transport.A conventional level crossing control system is characterized by the use of two types of electronic train detectors;one detects a train approaching to a level crossing section and the other then detects the train having left the level crossing.By contrast,closed-loop level crossing control systems in which level crossing control equipment and train-borne equipment communicate with each other have been advocated and are expected to serve as an effective solution to the abovementioned issue.This paper describes the following three types of closed-loop level crossing control systems:decentralized level crossing control system,fully-centralized comprehensive level crossing control system and fully-centralized individual level crossing control system.This paper then assesses the safety of these systems in comparison to the conventional level crossing control system.For the purpose of the assessment of their safety,a new accident analysis model called STAMP(systems theoretic accident model and processes)that is suitable for software intensive systems is used to clarify the advantage of the proposed three types of level crossing control systems in terms of safety.

Progress of photonuclear cross sections for medical radioisotope production at the SLEGS energy domain

Photonuclear reactions using a laser Compton scattering(LCS)gamma source provide a new method for producing radioisotopes for medical applications.Compared with the conventional method,this method has the advantages of a high specific activity and less heat.Initiated by the Shanghai Laser Electron Gamma Source(SLEGS),we conducted a survey of potential photonuclear reactions,(γ,n),(γ,p),and(γ,γ')whose cross sections can be measured at SLEGS by summarising the experimental progress.In general,the data are rare and occasionally inconsistent.Therefore,theoretical calculations are often used to evaluate the production of medical radioisotopes.Subsequently,we verified the model uncertainties of the widely used reaction code TALYS-1.96,using the experimental data of the^(100)Mo(γ,n)^(99)Mo,^(65)Cu(γ,n)^(64)Cu,and^(68)Zn(γ,p)^(67)Cu reactions.

Determination of Istanbul geoid using GNSS/levelling and valley cross levelling data

The Istanbul GPS Triangulation Network(IGTN) and the Istanbul Levelling Network(ILN),established in2006,provide data for the determination of a local GNSS/levelling geoid model.These networks’ measurements were done separately on both the Asian and European sides of the Bosphorus Strait in the vicinity of Istanbul.To connect these regions for those networks,a Valley Cross Levelling(VCL) data set,acquired in 1986 and 2004,was used.The use of this VCL data set was challenging in calculating the Istanbul geoid model,primarily because of its errors.In this study,this challenge was overcome through newly collected VCL data in 2010,allowing for the readjustment of the ILN and the newly collected VCL data set.The Istanbul geoid model was computed using soft computing techniques including the adaptive-network-based fuzzy inference system(ANFIS) and the artificial neural networks(ANNs).The resulting Istanbul GNSS/levelling geoid model is shown to be more reliable when compared with the model computed using conventional interpolation techniques.

Dirac R-matrix calculations of photoionization cross sections of Ni Ⅻ and atomic structure data of Ni

We performed R-matrix calculations for photoionization cross sections of the two ground state configuration 3s^23p^5（~2P_（3/2,1/2）~o） levels and 12 excited states of Ni Ⅻ using relativistic Dirac Atomic R-matrix Codes（DARC） across the photon energy range between the ionizations thresholds of the corresponding states and well above the thresholds of the last level of the Ni XIII target ion. Generally, a good agreement is obtained between our results and the earlier theoretical photoionization cross sections. Moreover, we have used two independent fully relativistic GRASP and FAC codes to calculate fine-structure energy levels, wavelengths, oscillator strengths, transitions rates among the lowest 48 levels belonging to the configuration（3s^23p^4, 3s3p^5, 3p^6, 3s^23p^33d） in Ni XIII. Additionally, radiative lifetimes of all the excited states of Ni XIII are presented. Our results of the atomic structure of Ni XIII show good agreement with other theoretical and experimental results available in the literature. A good agreement is found between our calculated lifetimes and the experimental ones.Our present results are useful for plasma diagnostic of fusion and astrophysical plasmas.

Mechanisms for Cross-Scaling, Flexibility and Social Learning in Building Resilience to Sea Level Rise: Case Study of Hampton Roads, Virginia

This case study examines how the Hampton Roads Sea Level Rise Preparedness and Resilience Intergovernmental Planning Pilot Project, a whole-of-government and whole-of-community approach to planning for and adapting to sea level rise, addressed coastal resilience in a southeastern Virginia watershed that spans multiple jurisdictions. Meeting the challenge of sea level rise requires that actors across multiple sectors—citizens, community organizations, industry and government—understand the risks and work together to make critical decisions regarding adaptation strategies and actions. The case study area includes Little Creek Amphibious Base, which is bordered by the cities of Norfolk and Virginia Beach. Adaptation responses to sea level rise by the military base and the local governments will impact each other and the residents of the area, but no cooperative agreements are in place for a joint or collaborative response. This case study examines public and private infrastructure at risk, the infrastructure interdependencies, and mechanisms for providing collaborative solutions. Engagement of area residents and other stakeholders is also integral to the process of adaptation, which includes educating about sea level rise risk and provides a mechanism for social learning that enables stakeholders to participate in critical adaptation decisions. The case study demonstrates a method to improve resiliency in the case study area and inform a regional, multi-sectoral response to sea level rise adaptation strategies.

一种低噪声C类LC压控振荡器的设计

为了改善压控振荡器相位噪声,基于40 nm CMOS工艺,设计一种低噪声C类LC压控振荡器。交叉耦合NMOS对管通过电流镜偏置作为电路的电流源,并采用共模反馈偏置电路使交叉耦合PMOS对管工作在饱和区,保证LC压控振荡器实现C类振荡。通过差分可变电容的设计,压控振荡器的增益减小,压控振荡器的相位噪声得到改善。设计了4组开关电容进行调节,增大压控振荡器的调谐范围。仿真结果表明,处于1.2 V的电压下,压控振荡器振荡频率范围在4.14~5.7 GHz,频率调谐范围变化率达到31.2%,相位噪声为-112.8 dBc/Hz。

Vertical deformation of the fault-crossing network around Baotou,observed by GPS

GPS data and precise leveling data of seismic network profiles across the fault in Baotou in 2006, 2009 and 2011 were processed and analyzed to test the feasibility of using GPS technology for fault-crossing vertical deformation monitoring. The results showed that high precision cross-fauh vertical deformation measurements can be obtained using appropriate GPS data processing strategies.

The Influence of Thrust Fault Structure on Cross-fault Short-leveling Survey

Aiming at different variation patterns of cross-fault short-leveling before earthquakes,the paper establishes the 2-D finite-element models with different crustal stratification and fault occurrence perpendicular to Longmenshan fault zone. By contact analysis and viscoelastic finite element method,the influence of fault structure on cross-fault short-leveling is obtained under the same constraint conditions,the results show that:with the increase of the horizontal projection distance of fault,the cumulative displacements of surface increase gradually in the models with fixed dip angles of the fault plane(model 1). However,when the horizontal projection distance exceeds 20 km,the influence of fault?s dip angle on the cumulative displacements of surface short-leveling will decrease significantly,and the cumulative displacements are maintained at about 1. 5 m. However,in the listric fault models(model 2),when the projection distance is less than 20 km,the listric fault structure impedes the sliding of fault. The short-leveling variation rate is only half of model 1;as a result,the ability to reflect the regional stress enhancement by cross-fault short-leveling is further weakened. But when the horizontal projection distance exceeds25 km,the cumulative displacements significantly increase,with the maximum displacement reaching 1. 75 m. The results of equivalent stress show that the listric fault structure causes a sudden increasement in equivalent stress when the horizontal projection distance is 10 km,higher equivalent stress values are accumulated between the projection distance of 5-20 km,and then high-low stress difference zones are formed at the bottom of the fault plane and near the transition zone of low-high dip angle.

Deformation Evolution Characteristics Revealed by GPS and Cross-fault Leveling Data before the M_S8. 0 Wenchuan Earthquake

Based on GPS velocity during 1999-2007,GPS baseline time series on large scale during1999-2008 and cross-fault leveling data during 1985-2008,the paper makes some analysis and discussion to study and summarize the movement,tectonic deformation and strain accumulation evolution characteristics of the Longmenshan fault and the surrounding area before the MS8. 0 Wenchuan earthquake,as well as the possible physical mechanism late in the seismic cycle of the Wenchuan earthquake. Multiple results indicate that:GPS velocity profiles show that obvious continuous deformation across the eastern Qinghai-Tibetan Plateau before the earthquake was distributed across a zone at least 500 km wide,while there was little deformation in Sichuan Basin and Longmenshan fault zone,which means that the eastern Qinghai-Tibetan Plateau provides energy accumulation for locked Longmenshan fault zone continuously. GPS strain rates show that the east-west compression deformation was larger in the northwest of the mid-northern segment of the Longmenshan fault zone,and deformation amplitude decreased gradually from far field to near fault zone,and there was little deformation in fault zone. The east-west compression deformation was significant surrounding the southwestern segment of the Longmenshan fault zone,and strain accumulation rate was larger than that of mid-northern segment.Fault locking indicates nearly whole Longmenshan fault was locked before the earthquake except the source of the earthquake which was weakly locked,and a 20 km width patch in southwestern segment between 12 km to 22. 5 km depth was in creeping state. GPS baseline time series in northeast direction on large scale became compressive generally from 2005 in the North-South Seismic Belt,which reflects that relative compression deformation enhances. The cross-fault leveling data show that annual vertical change rate and deformation trend accumulation rate in the Longmenshan fault zone were little,which indicates that vertical activity near the fault was very weak and the fault was tightly locked. According to analyses of GPS and cross-fault leveling data before the Wenchuan earthquake,we consider that the Longmenshan fault is tightly locked from the surface to the deep,and the horizontal and vertical deformation are weak surrounding the fault in relatively small-scale crustal deformation. The process of weak deformation may be slow,and weak deformation area may be larger when large earthquake is coming. Continuous and slow compression deformation across eastern Qinghai-Tibetan Plateau before the earthquake provides dynamic support for strain accumulation in the Longmenshan fault zone in relative large-scale crustal deformation.

Vegetation Formation in Estuarine Tidal Flats: Influences of Basin Scale and River-Crossing Structures of the Eight Rivers of Ise Bay in Mie and Aichi Prefectures, Japan

In this study, we examined the influences of the differences in basin scale and river-crossing structures of 8 rivers of Ise Bay in Mie and Aichi Prefectures, Japan on the vegetation in the estuarine tidal flats of these rivers. The dominant plant communities of the estuarine tidal flats formed from rivers of large-scale river basins (exceeding 300 km2) were determined. In the Miya River, the dominant plant community was the Suaeda maritima and Artemisia fukudo community. In the Kushida River, the dominant plant community was composed of Phacelurus latifolius, Artemisia fukudo, Phragmites australis, and bamboo. In the Kumozu River, the dominant community was composed of the coastal plants Calystegia soldanella, Lathyrus japonicus, and Carex pumila and the exotic plant of Lolium multiflorum. The plant community of Suzuka River was dominated by the exotic plant of Eragrostis curvula. Among the estuarine tidal flats influenced by a small-scale river basin (50 km2 or less), the plant community of Shinbori River (Fukue tidal flat) was dominated by Suaeda maritima, and the plant communities of the Shio and Harai Rivers were dominated by Phragmites australis. The plant community of Tanaka River was dominated by Phragmites australis and coastal plants. Regarding the relationship between the vegetation and the river environment for each study site, we hypothesised that in a large basin area with few structures crossing the river, the river water catchment in the estuary after heavy rains caused large areas of disturbance and formed bare land, providing suitable habitat for an annual salt marsh plant community. In contrast, in cases with many structures crossing the river, a stable channel, an excavated riverbed and the suppression of runoff and the resulting disturbance of the estuary, flooding did not occur during high tide. Moreover, we hypothesised that in a small basin with many structures crossing the river, disturbance to the estuary was not likely, and the perennial salt marsh plant community of Phragmites australis would be widely distributed, except for a river type such as the Shinbori River, in which tide and river flow were managed by a final closure.

LC-MS法检测制药设备隔离器的密闭性

建立制药设备隔离器密闭性的高效液相色谱-质谱法检测方法。采用WATERS ACQUITY UPLC?BE色谱柱(4.6 mm×150.0 mm,1.7μm),以0.02 mol/L甲酸铵水溶液(用0.1%氨水调节pH值至8.0)-乙腈为流动相,流速为0.5 mL/min,采用质谱检测器,在ESI-模式下采集数据。结果显示,乳糖在23.422 9~468.458 6 ng/mL范围内线性关系良好,线性相关系数r>0.999,定量限溶液质量浓度为23.422 9 ng/mL(0.05μg/m^(3)),检测限溶液质量浓度为7.026 9 ng/mL(0.01μg/m^(3)),PTFE采样膜回收率均在80%~120%。该方法可以准确、灵敏地检测制药设备隔离器的密闭性程度,为共线生产和共用设施区域防止交叉污染及保障人员健康提供了参考依据。

基于LC振荡电路的道口报警系统传感器改进研究

通过调整传感器LC振荡电路参数、改进传感器密封方式及调整传感器在钢轨的安装参数等措施,对兰州石化公司专用线两个人工看守道口报警系统传感器进行改进,成功解决了报警系统误报警、不报警以及不能长周期运行的问题。为道口的安全提供了可靠保证,并且对于同类型道口报警系统传感器的设计改进及现场安装、调整具有借鉴意义。

异构平台要素协同理论方法研究

要素协同是协同作战发展的必经之路,杀伤链的动态重构是其典型特征.本文针对平台协同难以满足复杂作战任务需求的问题,提出了异构平台要素协同的解决思路和理论方法.首先分析了要素协同关系复杂性、协同能力不确定性两个难点问题;其次基于反馈机制的可重构架构对复杂作战网络进行建模,提出了杀伤链算子的要素动态重构、协同序参量的效能定量评估方法;最后基于仿真场景实现杀伤链的动态构建与重构,可指导要素协同的算法设计与工程实践.

跨层次视角下信息安全氛围对员工信息安全制度遵守意愿的影响作用

员工安全遵守行为已成为保护企业信息资产安全的重要保障。侧重人因因素,讨论如何通过有效方法来规范和引导员工遵守信息安全制度。基于保护动机理论(protection motivation theory,PMT)和社会认知理论,采用跨层次分析方法,以员工信息安全制度遵守意愿为因变量,信息安全氛围为组织层面变量,感知严重性、感知易感性、反应效能和自我效能为个体层面变量构建研究模型。借鉴成熟量表设计问卷,发放问卷并获取有效数据,应用SPSS 26.0软件对研究模型进行假设验证。实证结果表明:感知严重性、感知易感性、反应效能和自我效能均正向影响员工信息安全制度遵守意愿;信息安全氛围跨层次既能直接影响员工信息安全制度遵守意愿,又可通过个体层面变量对结果变量产生影响作用。为强化企业安全管理提供一定的理论支撑。

悖论式领导对建设项目员工韧性的跨层次影响

在建设项目复杂多变的环境中,员工须具备高度韧性才能实现工作适应与个人发展。基于悖论理论与社会认同理论,以组织认同和悖论心态为中介变量,领导愿景为调节变量,构建了悖论式领导影响员工韧性的跨层次结构模型。运用多层线性模型方法对来自52个建设项目团队的问卷数据进行分析。结果表明:悖论式领导、组织认同、悖论心态对员工韧性均具有显著正向影响;悖论式领导对组织认同与悖论心态具有显著正向影响;悖论心态在悖论式领导与员工韧性的关系中起部分中介作用,而组织认同的中介作用不显著;领导愿景对悖论式领导与悖论心态的关系具有正向调节作用,对悖论式领导与组织认同的关系不具备显著调节作用。研究结果为增强建设项目员工韧性提供了管理启示。

我国跨境电商发展水平及影响因素研究

从发展实力和发展潜力维度,测度我国内地31个省份跨境电商发展水平,探讨价格机制、扶持机制和竞合机制对我国跨境电商发展的作用程度。结果表明:(1)2013—2022年我国跨境电商发展水平呈小幅增长趋势,其规模增长在一定程度上改变了我国传统对外贸易形式,但并未从根本上实现我国对外贸易的新突破。(2)与跨境电商发展实力相比,我国跨境电商发展潜力在全球经济下行压力、中美贸易摩擦以及新冠疫情背景下仍平稳增长,地区差距缩小,但信息化、科技化发展的省际差距在短期内难以弥补。(3)对跨境电商发展的影响程度由低到高依次是价格机制、竞合机制和扶持机制,经营成本、贸易摩擦负向显著影响跨境电商发展水平,政府政策对其正向影响程度偏弱,跨境电商政策效果尚未充分显现。

LC/APCI/MS在血药浓度研究中的应用

目的 :建立可用于血样检测的小分子药物代谢分析的高灵敏、简捷的液相色谱 /大气压解离质谱联用(LC/APCI/MS)方法。方法 :海洛因、6 乙酰吗啡、乙酰可待因和螺内酯分别于大鼠血浆中 39℃孵育 ,定时取样 ,用LC/APCI/MS测定原药及代谢产物的浓度 ,绘制代谢曲线。结果 :海洛因在 5min内消失 ,经 6 乙酰吗啡最终代谢为吗啡 ,30min后吗啡浓度达到峰值 ;6 乙酰吗啡在 2 0min内消失 ,代谢产物吗啡的浓度随之达到峰值 ;乙酰可待因在血浆中代谢缓慢 ,6 0min后仅有部分代谢 ,生成可待因 ;螺内酯也以缓慢的速度代谢 ,6 0min后代谢产物坎利酮的浓度尚远离峰值。结论 :LC/APCI/MS作为高灵敏度的简捷方法用于血药浓度研究具有广阔前景。