Novel high-voltage cathode for aqueous zinc ion batteries:Porous K_(0.5)VOPO_(4)·1.5H_(2)O with reversible solid-solution intercalation and conversion storage mechanism

Cathode materials that possess high output voltage,as well as those that can be mass-produced using facile techniques,are crucial for the advancement of aqueous zinc-ion battery(ZIBs)applications,Herein,we present for the first time a new porous K_(0.5)VOPO_(4)·1.5H_(2)O polyanionic cathode(P-KIVP)with high output voltage(above 1.2 V)that can be manufactured at room temperature using straightforward coprecipitation and etching techniques.The P-KVP cathode experiences anisotropic crystal plane expansion via a sequential solid-solution intercalation and phase co nversion pathway throughout the Zn^(2+)storage process,as confirmed by in-situ synchrotron X-ray diffraction and ex-situ X-ray photoelectron spectroscopy.Similar to other layered vanadium-based polyanionic materials,the P-KVP cathode experiences a progressive decline in voltage during the cycle,which is demonstrated to be caused by the irreversible conversion into amorphous VO_(x).By introducing a new electrolyte containing Zn(OTF)_(2) to a mixed triethyl phosphate and water solution,it is possible to impede this irreversible conversion and obtain a high output voltage and longer cycle life by forming a P-rich cathode electrolyte interface layer.As a proof-of-concept,the flexible fiber-shaped ZIBs based on modified electrolyte woven into a fabric watch band can power an electronic watch,highlighting the application potential of P-KVP cathode.

Satellite and high altitude platform-based inter-vehicle communications in vast and desolate areas

In order to solve the problem of inter-vehicle communication （IVC） in vast and desolate areas such as the desert and the Gobi, two vehicle network models are proposed. One is based on satellite communication and the other is based on high altitude platform （ HAP ） communication. The system outline and networking modes of the two models are described. In the satellite communication based model, all the vehicles are equipped with vehicle-bone satellite communication on the move terminals and the communication signals between vehicles are forwarded by satellite. In the high altitude platform-based model, the HAPs are equipped with base station facilities to form aerial base stations, and vehicles can communicate with each other via common terrestrial mobile communication devices. Some key parameters such as path loss, link loss and system capacity are also computed. The analysis shows that both the two models can satisfy the requirement of IVC in the descriptive environment.

COOPERATIVE DIRECTIONAL INTER-CELL HANDOVER SCHEME IN HIGH ALTITUDE PLATFORM COMMUNICATIONS SYSTEMS

A novel Cooperative Directional inter-cell Handover Scheme(CDHS) for High Altitude Platform(HAP) communications systems is proposed,in which the handover target cell and the two cells adjacent to this handover target cell work cooperatively to exploit the traffic fluctuation to improve handover performance.Users in the overlap area of the overloaded handover target cell will be forced to handover directionally before their optimal handover boundary in order to free up resources for the handover calls which would otherwise be dropped due to the shortage of resources and queue time out.Simulation results show that the handover call dropping probability is greatly reduced(at least 60%) compared with the general queue handover scheme,with little performance reduction to the call blocking probability,and the Not in the Best Cell(NBC) average time is only increased moderately.Moreover,an optimal cell radius can be achieved for a specific platform speed by minimizing the unified system performance,which is the linear combination of the handover call dropping probability and the NBC average time.

Statistical Modeling of the High Altitude Platform Dual-Polarized MIMO Propagation Channel

In order to investigate the benefit of multiple-input multiple-output(MIMO) technique applying to the high altitude platform(HAP), a 2×2 MIMO statistical model, which can accurately describe the channel between HAP and high-speed train, is presented. And dual polarization diversity is particularly considered. Based on first-order three-state Markov chain, the single-input single-output(SISO) channel, a subset of the MIMO channel is first established. The ray tracing approach applied to the digital relief model(DRM) which covers the railway between Xi'an and Zhengzhou is used to obtain the state probability vector and matrix of the state transition probability. The proposed model considers both Doppler shift and temporal correlation, and the polarization correlation and spatial correlation statistical properties of large-scale fading and smallscale fading are analyzed. Moreover, useful numerical results on the MIMO HAP channel outage capacity are provided based on which, significant capacity gains with respect to the conventional SISO case are illustrated. Such statistical channel model can be applied to the future wireless communication system between HAP and high-speed train.

CAPACITY CALCULATION OF TD-CDMA HIGH ALTITUDE PLATFORM SYSTEM

A capacity calculation method of High Altitude Platform System(HAPS) is proposed in which TD-CDMA multiple access schemes are applied.With the influence of both power limit and bandwidth limit on capacity integrated,the paper derives the equations by which the capacity of TD-CDMA systems can be calculated,and performs calculation on a practical system.This calculation method is quite simple and effective with a comparatively small error,which is essential to the de-signing and research on HAPS.

STEERABLE ANTENNAS MOVEMENT COMPENSATION FOR HIGH ALTITUDE PLATFORM

High Altitude Platform(HAP) must compensate for relative motion with respect to the ground because of the stratosphere complexity,which is important to guarantee Quality of Service(QoS) in intended coverage area.With analysis on HAP movement models for predicting the geographical coverage in the cases of shift horizontally and vertically,yaw,roll and pitch,the mechanisms of steerable antennas movement compensation are investigated.The mechanism is applied to a scenario of 127 cell architecture,with a cell cluster size of four.By the simulation results of Carrier to Interference Ratio(CIR),the steerable antenna movement compensation mechanism decrease influence of HAP movement and guarantee effective coverage of the service area.

Analysis of Accuracy of a High-speed Mobile Platform Control System

The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain both high accuracy and high speed for the position and speed control, A single-stack computer system is constructed and a special control algorithm is prescribed to controled the linear actuator continuously. In this paper, the nonlinear errors resulted from the magnetic saturation and the hysteresis is anaysis and discussed. In the view of electromagnetic propotional control, the actuator is a stage proportional magnet, because the driving current to the linear acuator changes for a number of cycles and a series of reset points will occur as the current undergoes cyclic changes. At each reset point the original starting characteristics of the system are re-established. A large number of reset points across the full stroke of the platform results in a significant reduction in the nonlinear behavior. The stage control is first discussed. Experiments carried out to obtain the characteristics of the mobile platform control system. It is demonstrated that with the introduction of stage control, nonlinearities, such as saturation and hysteresis, are greatly reduced, system stiffness is increased, and the positioning accuracy and resolution are improved. The effect of dither due to a "digital fragment" signal is also examined and found to be crucial in reducing the hysteresis and in improving the resolution accuracy.

A High Throughput Screening Platform for Skin Tuning Properties from Natural Products: Identification of Skin Tanning Compounds

Skin lightening and tanning are two major areas dominating the market of skincare and cosmetic products. Though the demands are originated from two different communities, the two areas share a same goal—skin colour tuning. The known safe compounds with skin colour tuning activities are limited. In contrary, Chinese medicinal herb provides a pool of natural bioactive compounds, which have been used in Asian countries for long time and have been tested for its toxicity. Here, we demonstrate a high throughput screening platform for potential compounds usable for skin colour tuning. From 147 natural compounds, 26 of them showed potential in skin tanning functions by using the high throughput melanogenesis platform based on the melanogenesis assay on B16 melanocytes. Five of them promoted melanogenesis by over 50%. Moreover, apart from 1, 8-dihydroxyanthraquinone, the other four compounds showed enhancement effect on tyrosinase activity. From the result, the compounds increased the Vmax of tyrosinase without changing the Km in a dose-dependent manner. Thus, there should be no irreversible structural change of the enzyme. Definitely, this report contributes to the development of personalization in skincare and cosmetic products.

Research on the cutting thermodynamic behavior of high-strength large-thickness offshore jack-up platform leg rack

The cutting of offshore jack-up platform leg rack is highly nonlinear and complex thermal processing process. The residual stress influences the following welding quality and cause crack growth. Therefore, research on the cutting practice of jack-up platform leg rack is significant to improve the safety and reliability of the offshore platform. A heating source model that is applicable to the cutting and emulation of high-strength thick plates han been presented. Then, the thermo-physical characteristic parameters of NV E690 leg plate was calculated by JMATPRO, and is revised according to the theory of metallographic. Furthermore, the numerical simulation of the linear cutting of leg plate was conducted, and the reliability of the heating source model and the thermo-physical characteristic parameters of material were proved by comparing them with the experimental data. Bused on the former study, the optimal parameter （ heating source, cutting speed and radius of the heating source model） which ensured that the gear plate was cut through without edge collapses during cutting was calculated. The optimized process parameters can be used to study the distribution of residual stress in gear plate during cutting which provides theoretical guideline for improving the construction technology of offshore platform legs.

桑托斯盆地盐下孤立碳酸盐台地沉积建造与深水大油田

针对桑托斯被动陆缘盆地深水盐下碳酸盐岩储层分布特征及大油田成藏规律不清的难题,综合利用地质、地震及岩心等数据资料,通过早白垩世原型盆地与岩相古地理恢复重建,提出盐下碳酸盐岩沉积建造受控于坳间断隆型和坳中断凸型两类孤立台地。坳间断隆型孤立台地分布于现今盐下坳间隆起带上,建造于早期陆内和陆间裂谷两个原型阶段继承性发育的单断式和双断式垒式断块上,早白垩世陆内裂谷晚期沉积的ITP组介壳灰岩和陆间裂谷早期沉积的BVE组微生物灰岩为连续建造;坳中断凸型孤立台地分布于现今盐下坳陷带中,建造于早期陆内裂谷原型阶段火山岩建隆所形成的凸起带上,发育BVE组微生物灰岩。两类孤立台地灰岩所形成礁滩体均具有储层厚度大、物性好的特点。结合盐下已发现大油田解剖,发现两类台地均可形成大型构造-岩性复合圈闭,周缘为优质湖相和潟湖相烃源岩环绕,上覆为巨厚的优质蒸发盐岩盖层高效封堵,形成了“下生中储上盖”式最佳生储盖组合关系,油气富集程度高。已发现大油田均为具有统一压力系统的底水块状油田,且均处于充满状态。未来勘探重点目标是西部隆起带和东部隆起带南段上的坳间断隆型孤立台地及中央坳陷带中的坳中断凸型孤立台地。该项研究成果为在桑托斯被动陆缘盆地超前选区选带、新项目评价及中标区块探区勘探部署提供了重要依据,也为今后在全球被动大陆边缘盆地深水勘探战略选区提供借鉴。

数字化转型、平台化变革与企业创新绩效——基于“技术—组织—创新”范式的分析

在数字经济和实体经济深度融合、全球创新竞争加剧的背景下,加快数字化转型和平台化变革,塑造多元互动和整体进化的创新生态系统,是增强制造业企业自主创新能力的重要途径。在传统技术经济范式中引入数字要素和平台理念,构建“技术—组织—创新”理论框架,分析数字化转型促进组织平台化变革进而提升企业创新绩效的作用机制。在理论分析的基础上,基于2014—2021年中国制造业上市公司的面板数据,实证检验了数字化转型、平台化变革与企业创新绩效之间的关系。研究结果表明:数字化转型对企业创新绩效的提升具有普遍的促进作用,并且对数字化水平更高和股权集中度更高的企业效果更显著;数字化转型促进了企业组织的平台化变革,基于数字平台形成创新生态系统进而增强了企业自主创新能力;数字化对企业平台化的推动作用主要通过专业化分工和企业互联互通实现,这是工业互联网平台发挥作用的两个重要维度。推动制造业企业的数字化转型和平台化变革,充分发挥数字平台的创新基础设施作用,能够提升企业创新绩效,推动制造业高质量发展。

公立医院高质量发展背景下平台型领导对护士创新行为影响研究

目的:为提高公立医院护士队伍创新绩效,提升护理服务质量,推动公立医院高质量发展,本文基于实地调研,系统探索公立医院护士长平台型领导风格促进下属护士创新行为的作用机制。方法:采用方便抽样,对J省与N省三家公立医院428名护士进行问卷调查,并通过相关分析和回归分析对护士长平台型领导风格水平与护士工作繁荣、任务相关信息处理能力和创新行为间关系进行检验。结果:护士长平台型领导风格可以通过提升下属护士任务相关信息处理能力和工作繁荣两重机制共同促进他们的创新行为。结论和建议:公立医院应通过加强各科室护士长平台型领导风格水平,鼓励其通过这一领导风格的发挥着力提升下属护士任务相关信息处理能力和工作繁荣水平,促进下属护士展现更多创新行为,最终实现公立医院护理服务质量提升和高质量发展。

西汉董仲舒学术继承者考述

董仲舒是名副其实的教育家,大半生都在从事教育工作,其故里及周边都有相关遗迹。胡毋生与董仲舒并无师承关系,但可能二人有相同的学术渊源。董仲舒有五大弟子:兰陵褚大、广川殷忠、温吕步舒、吾丘寿王、东平赢公。龙门司马迁并非董仲舒的入室弟子。东平赢公守师法不辍,其再传弟子严彭祖、颜安乐形成严颜学派,传承董仲舒学说。

一种基于UVM的USB接口验证平台设计

随着集成电路的发展,电子设备变得越来越复杂,对于通用串行总线(Universal Serial Bus,USB)接口的验证来说,传统的验证方法已经无法满足需求。使用通用验证方法学(Universal Verification Methodology,UVM)验证平台可以提高验证效率,减少人工操作和误差,保证USB设备的品质和可靠性。本文介绍了一种基于UVM的USB接口验证平台设计,该平台可以对USB接口进行模块化和可重用性设计,支持自动化测试流程,测试数据的收集和分析等功能。通过应用UVM验证平台,针对USB接口传输方式对其单次传输过程进行封装并继承使用,加速USB设备的开发和测试进程,提高产品质量和生产效率。实验结果表明,与传统的验证方法相比,使用UVM验证平台可以显著提高验证效率和精度。此外,该平台还具有高可靠性和高可维护性,可广泛应用于各种USB设备的开发与生产过程中。

“丘”与“台”:中国早期陵墓封土形态之缘起探究

本文梳理了学术界关于墓葬建筑“封土”成因的三种认识:“山陵模拟说”“台榭享堂说”“居丘筑台说”。在“居丘筑台说”的基础上,详细考释了“丘”“台”“坟”的平面及空间形态,提出了封土墓的产生是丘、台直接影响的结果,质疑了当前学术界的主流认识:封土由享堂下的台榭转化而来。

层台累榭--楚国建筑形制特征探讨

两周时期楚国作为南方长江流域的霸主国家独领风骚,楚文化源于北方中原的商周文化,发展壮大于南方楚地,得天独厚的自然环境是孕育楚文化的重要基础。基于此,该文首先分析了楚文化及其自然环境的独特特征。其次,推论影响楚建筑形制的因素,提出其在楚文化与楚地自然环境影响下产生发展了楚高台建筑与干阑建筑。最后以文献和考古记载中的楚宫建筑为例,探讨楚国建筑“层台累榭”之形制特征。

我国数字经济高质量发展的法治维度及展开

自2015年“互联网+”行动计划以来,近十年的以互联网为基础设施,以互联网平台为组织体,以“数据、算法、算力”为生产要素的数字经济在取得显著成就的同时,也给现有治理结构和机制带来了诸多挑战。为保障和促进数字经济高质量发展,需构建多维立体的法治体系,以规范数字经济有序发展为基线,以支持其高质量创新发展为主线。在监管方面,应坚持分类分级原则,以常态化监管合理配置资源、提高监管效率;在立法方面,健全市场经济法律法规体系,以科学立法引领数字经济高质量发展;在司法方面,适用动态竞争观审慎规制各类尚待观察的数字经济活动,以公正司法保障数字经济关键生产要素市场上的公平竞争;在合规方面,构建政府主导,企业、社会、行业协会与消费者及其组织参与的多元共治体系,以促进企业合规管理的引导与激励。

三级公立医院智慧后勤管理平台建设与应用

目的建设智慧后勤管理平台,实现对医院人、财、物、技术的协同管理,达到高安全、优品质、低成本的运营管理目标。方法结合医院实际运营需求,引入“平台+现场管家专业运维”模式,打通医院后勤各系统专业服务数据,助力医院数字化转型。结果建成的智慧后勤管理平台,能够实现对后勤各系统专业服务数据的统一协调、统一调度、闭环跟踪,真正实现了后勤一站式管理,提升了医院的社会效益和经济效益。结论三级公立医院智慧后勤管理平台能推动医院后勤部门数字化转型,提高医院运行效率和服务质量。

流量变现、价值创造与中国平台经济的高质量发展

平台经济是中国经济高质量发展的新空间、新引擎、新渠道和新支撑。随着平台用户增量触顶,中国平台经济整体上已经进入从增量竞争向存量竞争过渡的关键转型期,新发展阶段下实现平台经济的高质量发展要求对中国平台经济领域不同商业模式的核心特征、运行机制、外部性影响进行深入分析。首先,从降低市场交易成本、提升市场交易效率和平台与实体经济高质量融合三个方面论述平台经济高质量发展的核心内容;其次,分析流量变现和价值创造两种平台商业模式的主要特征及产生基础,并比较两种模式与平台经济高质量发展的一致性及其作用路径。研究表明,以用户真实需求为核心、以提升平台内交易效率为目的,最终能够实现多方互利的价值创造模式是中国平台经济高质量发展的内在要求。因此,政府应继续加强平台经济的科学监管,引导培育数字平台经济价值创造模式的外部基础,平台企业应该平衡流量变现模式和价值创造模式,加强数字技术的研发和推广应用。

基于高空平台的边缘计算卸载:网络、算法和展望

高空平台(high altitude platform,HAP)技术与多接入边缘计算(multi-access edge computing,MEC)技术的结合将MEC服务器部署区域由地面扩展到空中,打破传统地面MEC网络的局限性,为用户提供无处不在的计算卸载服务。针对基于HAP的MEC卸载研究进行综述,首先,从HAP计算节点的优势、网络组成部分、网络结构、主要挑战及其应对技术4个方面分析基于HAP的MEC网络;其次,分别从图论、博弈论、机器学习、联邦学习等理论的角度对基于HAP的MEC卸载算法进行横向分析和纵向对比;最后,指出基于HAP的MEC卸载技术目前存在的问题,并对该技术的未来研究方向进行展望。