Construction of Pd-doped RuO_(2) nanosheets for efficient and stable acidic water oxidation

RuO_(2) has been considered a potential alternative to commercial IrO_(2) for the oxygen evolution reaction(OER)due to its superior intrinsic activity.However,its inherent structure dissolution in acidic environments restricts its commercial applications.In this study,we report a novel Pd-doped ruthenium oxide(Pd–RuO_(2))nanosheet catalyst that exhibits improved activity and stability through a synergistic effect of Pd modulation of Ru electronic structure and the two-dimensional structure.The catalyst exhibits excellent performance,achieving an overpotential of only 204 mVat a current density of 10 mA cm^(-2).Impressively,after undergoing 8000 cycles of cyclic voltammetry testing,the overpotential merely decreased by 5 mV.The PEM electrolyzer with Pd0.08Ru0.92O_(2) as an anode catalyst survived an almost 130 h operation at 200 mA cm^(-2).To elucidate the underlying mechanisms responsible for the enhanced stability,we conducted an X-ray photoelectron spectroscopy(XPS)analysis,which reveals that the electron transfer from Pd to Ru effectively circumvents the over-oxidation of Ru,thus playing a crucial role in enhancing the catalyst's stability.Furthermore,density functional theory(DFT)calculations provide compelling evidence that the introduction of Pd into RuO_(2) effectively modulates electron correlations and facilitates the electron transfer from Pd to Ru,thereby preventing the overoxidation of Ru.Additionally,the application of the two-dimensional structure effectively inhibited the aggregation and growth of nanoparticles,further bolstering the structural integrity of the catalyst.

高硬度结构件绿色平面抛光工艺研究

针对精密气体静压转台高硬度结构件超精密加工需求,研究并提出一种高硬度结构件绿色平面抛光工艺。采用单因素试验法,优化抛光液组分,当磨粒粒径为3μm,磨粒浓度质量分数为20%时,抛光工件的表面质量最优。采用正交试验设计,分析各工艺参数对加工表面质量的影响规律,进而获得最优因素水平组合。

基于预测算法的在线空间众包任务分配策略

根据空间众包任务类型的多样化特点,构建空间众包任务分配模型并提出基于预测算法的在线任务分配策略。在批处理模式下,将最大分数任务分配问题转化为寻找二分图最大权匹配问题,通过匈牙利算法对其进行求解得到每个时间片的最大分数,并利用预测算法使得工人在完成该任务后尽可能处于任务密集区域,避免出现工人没有合适任务可执行的情况发生,实现模型的最优在线任务分配。在滴滴快车数据集上的实验结果表明,与BASIC、LLEP和CDP策略相比,该策略在整个时间段内的总任务分配数量最多能提高10%,具有更高的任务分配效率与质量。

Trust Access Authentication in Vehicular Network Based on Blockchain

Data sharing and privacy securing present extensive opportunities and challenges in vehicular network.This paper introducestrust access authentication scheme’as a mechanism to achieve real-time monitoring and promote collaborative sharing for vehicles.Blockchain,which can provide secure authentication and protected privacy,is a crucial technology.However,traditional cloud computing performs poorly in supplying low-latency and fast-response services for moving vehicles.In this situation,edge computing enabled Blockchain network appeals to be a promising method,where moving vehicles can access storage or computing resource and get authenticated from Blockchain edge nodes directly.In this paper,a hierarchical architecture is proposed consist of vehicular network layer,Blockchain edge layer and Blockchain network layer.Through a authentication mechanism adopting digital signature algorithm,it achieves trusted authentication and ensures valid verification.Moreover,a caching scheme based on many-to-many matching is proposed to minimize average delivery delay of vehicles.Simulation results prove that the proposed caching scheme has a better performance than existing schemes based on central-ized model or edge caching strategy in terms of hit ratio and average delay.

Design and Implementation of National Meteorological Service Platform

In order to change the distributed status of the meteorological service platform,based on the integration of the self-built service platforms including meteorology,climate,observation and service,National Meteorological Information Center( NMIC) constructs National Meteorological Service Platform( NMSP). NMSP is a unified national meteorological service platform to provide browsing,searching and displaying of observation,weather forecasting,warning information,historical climate data and network information. NMSP uses the MVC design pattern.For adapting the characteristics of meteorological application,above J2 EE application framework( Struts + Spring + Hibernate),NMSP encapsulates data exchange module which improves flexibility and efficiency of the system development. On March 2015,NMSP( version 2. 0)has been on operational running,which covers six core sections,nearly 100 sub-modules,2000 kinds of service products. It plays an effective supporting role on various types of meteorological service.

逆转座子LINE1在Hela细胞中的表达及转录组分析

为研究逆转座子LINE1(简称为L1)在Hela细胞内的作用机制,对转染L1的Hela细胞和正常细胞进行转录组测序,通过对转录组数据进行拼接组装,对差异表达基因进行了生物信息学分析。结果表明:试验共筛选出391个差异表达基因,其中45.6%的差异表达基因显著性上调,这些基因通过GO分类注释,可分为14类;通过KEGG对差异基因进行通路富集,表明差异基因主要富集在破骨细胞分化、色氨酸代谢、乙型肝炎、病毒致癌作用和可卡因成瘾等信号通路,发现了一些与细胞黏着连接、表皮相关的基因有差异性表达。研究表明,通过转录组测序,获得了丰富的关于L1在Hela细胞中表达的信息,为进一步研究L1在细胞中的作用机制供了思路和理论依据。

Microstructure and Thermoelectric Properties of Bi- and Cu-Substituted Ca_3Co_4O_9 Oxides

Bi- and Cu-substituted Ca3Co4O9 samples were prepared by conventional solid-state reaction method and the effect of element substitution on the microstructures and thermoelectric properties was investigated. Partial substitution of Cu for Co leads to an increase in electrical conductivity and a decrease in Seebeck coefficient due to the rise of hole concentration. The microstructure of Cu-substituted sample is almost unchanged compared with undoped Ca3Co4O9. On the other hand, partial substitution of Bi for Ca gives rise to a significant increase in the grain size, and c-axis-oriented structure can be formed in Ca2.7Bi0.3Co4O9, resulting in an obvious increase in electrical conductivity. Cu and Bi co-substitution further increases the grain growth and the electrical conductivity of Ca2.7Bi0.3Co3.7Cu0.3O9. Thus, Cu and Bi co-substitution samples possess the optimal thermoelectric performance at high temperature and the highest value of power factor can reach 3.1×10^-4 Wm^-1.K^-2 at 1000 K.

A Region Selection Method for Real-time Local Correlation Tracking of Solar Full-disk Magnetographs

Hundreds of images with the same polarization state are first registered to compensate for the jitters during an observation and then integrated to realize the needed spatial resolution and sensitivity for solar magnetic field measurement. Due to the feature dependent properties of the correlation tracker technique, an effective method to select the feature region is critical for low-resolution full-disk solar filtergrams, especially those with less significant features when the Sun is quiet. In this paper, we propose a region extraction method based on a Hessian matrix and information entropy constraints for local correlation tracking(CT) to get linear displacement between different images. The method is composed of three steps:(1) extract feature points with the Hessian matrix,(2)select good feature points with scale spaces and thresholds, and(3) locate the feature region with the twodimensional information entropy constraints. Both the simulated and observational experiments demonstrated that our region selection method can efficiently detect the linear displacement and improve the quality of a groundbased full-disk solar magnetogram. The local CT with the selected regions can obtain displacement detection results as good as the global CT and at the same time significantly reduce the average calculation time.

Postoperative Therapeutic Effect of ACL Reconstruction at Different Periods

Objective: To analyze postoperative therapeutic effects of patients with fractured anterior cruciate ligament (ACL) that underwent autologous tendon reconstruction at early and late period. Methods: A total of 60 patients underwent autologous tendon reconstruction were enrolled and retrospectively analyzed via arthroscopes from December, 2015 to December, 2017 in our hospital, in which 30 patients treated with ACL reconstruction within 6 weeks of injury were selected as the early reconstruction group (Group A), and the other 30 cases with ACL reconstruction between 6 weeks and 6 months were as late reconstruction group (Group B);the therapeutic effect of early and late ACL reconstruction was analyzed by recording and comparing of several indexes, such as knee lysholm score, knee IKDC score, intraoperative hemorrhage, operation time, pre- and post-operative range of motion (ROM) of the knee, etc. Results: The pre- and post-operative lysholm scores and IKDC scores were compared between the two groups, without statistically significant results (P > 0.05). The knee ROM scores of the late reconstruction group were higher than those of the early group (P < 0.05), and the intraoperative blood loss in the late stage was less than that in the early group (P < 0.05), which exhibits that the short-term clinical efficacy of early and late arthroscopic autologous tendon reconstruction for knee ACL injury was similar, but the late reconstruction group was with less intraoperative bleeding, and better postoperative joint mobility recovery;in conclusion, it is recommended that patients can be operated between 6 weeks and 6 months after injury.

The Distinction of the Major Design Principles of Planning Systems and How They Potentially Impact Planning Outcomes

This paper addresses how different urban planning systems play their role in the development of cities,and how this directly affects the role and status of urban planning in social construction,and how to determine the social awareness of urban planning.By contrasting and defining the challenges and advantages of the regulatory,discretionary and hybrid urban planning systems,as well as examining the potential possibilities of each system,which system is more effective will become apparent.Therefore,planning and policy implementation can be more extensive and special.At the same time,a sound planning system can form relevant information feedback to propose amendments and adjustment methods for the city's planning content and policy and planning operation,which comply with the objective requirements of urban development.

Identifying the origin of porous evolution of microsized bismuth in potassium-ion batteries

Microsized bismuth(Bi)with in-situ constructed three-dimensional(3D)porous network has been considered as a promising anode for high-performance potassium-ion batteries(PIBs).However,the mechanism of the in-situ porous evolution of microsized Bi during the charge/discharge process is still mysterious.Herein,various electrolytes are employed to disclose the origin of porous evolution of microsized Bi in PIBs.Experimentally and theoretically,the 3D porous network originates from the uniform interfacial charge distribution on the Bi surface in the linear ether-based electrolyte.In addition,the universality of the interfacial charge distribution mechanism was verified by microsized Sn and Sb.The in-situ constructed 3D porous network of Bi enables a superior potassium storage performance in a wide temperature range from-40 to 40℃.More importantly,the K_(0.9)Mn_(0.7)Ni_(0.3)O_(2)||Bi full cell delivers excellent cycling stability(a high capacity retention of 88.44%even after 2,000 cycles)and good temperature tolerance.This work gives a distinct clarification of the origin of the porous evolution of microsized Bi during cycling,which is critical for developing high-performance PIBs.

Numerical simulation study on the hygrothermal performance of building exterior walls under dynamic wind-driven rain condition

Wind-driven rain(WDR)has a significant influence on the hygrothermal performance,durability,and energy consumption of building components.The calculation of WDR loads using semi-empirical models has been incorporated into the boundary conditions of coupled heat and moisture transfer models.However,prior research often relied on fixed WDR absorption ratio,which fail to accurately capture the water absorption characteristics of porous building materials under rainfall scenarios.Therefore,this study aims to investigate the coupled heat and moisture transfer of exterior walls under dynamic WDR boundary conditions,utilizing an empirically obtained WDR absorption ratio model based on field measurements.The developed coupled heat and moisture transfer model is validated against the HAMSTAD project.The findings reveal that the total WDR flux calculated with the dynamic WDR boundary is lower than that obtained with the fixed WDR boundary,with greater disparities observed in orientations experiencing higher WDR loads.The variations in moisture flow significantly impact the surface temperature and relative humidity of the walls,influencing the calculation of cooling and heating loads by different models.Compared to the transient heat transfer model,the coupled heat and moisture transfer model incorporating dynamic WDR boundary exhibits maximum increases of 17.6%and 16.2%in cooling and heating loads,respectively.The dynamic WDR boundary conditions provide more precise numerical values for surface moisture flux,offering valuable insights for the thermal design of building enclosures and load calculations for HVAC systems.

2018—2022年某医院儿科临床分离病原菌种类及耐药趋势分析

目的回顾性分析住院患儿临床分离的病原菌种类和耐药性变迁,为临床合理选择使用抗菌药物提供指导依据。方法对2018年1月—2022年12月某医院收治患儿细菌学标本的来源、病原菌分离情况和药敏试验资料进行分析。结果2018—2022年共分离病原菌809株,其中革兰阴性菌476株(58.83%)、革兰阳性菌333株(41.16%)。分离的主要病原菌为大肠埃希菌208株(25.71%)、屎肠球菌96株(11.87%)、肺炎克雷伯菌51株(6.30%)、金黄色葡萄球菌43株(5.32%)和鲍曼不动杆菌43株(5.32%)。主要标本来源为中段尿标本366株(45.24%)、痰液标本168株(20.77%)、血液标本121株(14.96%)。大肠埃希菌对亚胺培南、哌拉西林;他唑巴坦和头孢他啶敏感,对氨苄西林和左旋氧氟沙星耐药率呈上升趋势(P<0.05)。金黄色葡萄球菌对万古霉素、替加环素和利奈挫胺均敏感,对青霉素耐药率均>90%。共检出多重耐药菌24株,耐甲氧西林金黄色葡萄球菌检出率为30.23%,多重耐药鲍曼不动杆菌检出率为20.93%。结论该医院儿科临床分离的革兰阴性菌检出率逐年增多,对三代头孢类抗菌药物保持高耐药性、对喹诺酮类抗菌药物耐药率逐渐增高。

20家三级医院血管导管相关感染防控现况调查

目的调查血管导管相关感染(VCAI)防控实施现状,为进一步推动新指南落实、制定符合临床实际的置管操作及维护核查表等提供依据。方法采用横断面调查方法,根据《血管导管相关感染预防与控制指南(2021版)》设计调查问卷,于2022年6-9月对江苏省20家三级医院进行在线问卷调查。调查内容包括医疗机构血管导管相关感染预防与控制指南推行情况,个案调查包括重点部门成年患者置管防控措施落实情况。结果共纳入20家三级医院2895例患者,75.0%(15/20)医院向临床医护提供置管核查表,83.2%(2410/2895)置管及维护人员接受过VCAI指南培训;置管前,16.2%(469/2895)置管环境不符合规范(Ⅲ类或Ⅳ类环境);70.3%(324/461)输液港植入在手术室进行;9.0%(260/2895)置管部位为股静脉;置管中,97.2%(2814/2895)遵循最大无菌屏障要求;仅10.8%(314/2895)使用含氯己定醇的皮肤消毒剂消毒穿刺部位;置管后,39.9%(1154/2895)应用三通旋塞阀进行导管连接;50.3%(364/723)输注静脉内脂肪剂(IVFE)时每隔12 h更换输液装置;亚组分析显示,置管部位、最大无菌屏障、皮肤消毒剂类型、导管连接方式、输注IVFE时更换管路频率在ICU与非ICU病区分布差异具有统计学意义(P<0.05)。结论VCAI预防与控制措施培训及落实情况需进一步加强,迫切需要制定切合实际、可执行的核查表以督促防控措施进一步实施。

DyPipe: A Holistic Approach to Accelerating Dynamic Neural Networks with Dynamic Pipelining

Dynamic neural network(NN)techniques are increasingly important because they facilitate deep learning techniques with more complex network architectures.However,existing studies,which predominantly optimize the static computational graphs by static scheduling methods,usually focus on optimizing static neural networks in deep neural network(DNN)accelerators.We analyze the execution process of dynamic neural networks and observe that dynamic features introduce challenges for efficient scheduling and pipelining in existing DNN accelerators.We propose DyPipe,a holistic approach to optimizing dynamic neural network inferences in enhanced DNN accelerators.DyPipe achieves significant performance improvements for dynamic neural networks while it introduces negligible overhead for static neural networks.Our evaluation demonstrates that DyPipe achieves 1.7x speedup on dynamic neural networks and maintains more than 96%performance for static neural networks.

难治性腹膜透析相关性腹膜炎发生的影响因素与风险评分模型研究

目的分析难治性腹膜透析相关性腹膜炎发生的影响因素,构建风险评分模型,为临床治疗和预防提供参考依据。方法收集南京医科大学附属南京医院2010年4月-2019年2月血液净化中心临床诊断为腹膜透析相关性腹膜炎(Peritoneal dialysis associated peritonitis,PDAP)患者129例为研究对象,根据临床病情进展分为难治性PDAP 30例、非难治性PDAP 99例,回顾性收集两组患者临床基线资料,归纳难治性PDAP发生的影响因素,建立风险评分模型。结果129例PDAP患者,发生难治性PDAP 30例,发生率为23.26%。腹膜透析透出液培养分离病原菌30株,革兰阳性菌13例占43.33%,革兰阴性菌10例占33.33%,真菌7例占23.33%。革兰阴性菌感染、存在并发症以及CRP是难治性PDAP发生的影响因素(P<0.05)。构建风险评分模型:革兰阴性菌感染(2分)、存在并发症(2分),CRP值1.34~22.6mg/L、23.6~58.8mg/L、62.4~123.5mg/L、124~358mg/L依次为0、1、2、3分,风险评分模型预测难治性PDAP的ROC曲线下面积为0.778(95%CI:0.696~0.846,P<0.05),最佳截断值为4分,灵敏度、特异度分别为60.00%、91.92%,约登指数为0.519。结论革兰阴性菌感染、存在并发症、CRP值较高是难治性PDAP发生的影响因素,构建的风险评分模型预测难治性PDAP准确度较好,临床应用价值较高。

老年住院患者血培养细菌分布与耐药性分析

目的分析某三甲医院老年患者血培养分离病原菌分布与耐药特点,为血流感染的预防和治疗提供临床依据。方法采用回顾性研究,收集2015年1月-2017年12月江苏大学附属医院老年住院患者中送检10000例的血培养的临床资料,了解其细菌种类、科室分布,并对细菌耐药性进行分析。结果10000份老年患者血培养标本中分离病原菌312株,其中革兰阴性菌182株占58.33%;革兰阳性菌125株占40.07%;真菌5株占1.60%,排名前五的菌株依次为:大肠埃希菌、肺炎克雷伯菌、表皮葡萄球菌、溶血葡萄球菌和鲍氏不动杆菌。血培养阳性菌株主要来源于重症监护室(107株,34.29%)。大肠埃希菌和肺炎克雷伯菌对亚胺培南均敏感,鲍氏不动杆菌对碳青霉烯类和复合酶抑制剂耐药率>75%,葡萄球菌属对万古霉素和利奈唑胺耐药率为0;耐甲氧西林金黄色葡萄球菌(MRSA)检出率为41.18%(7/17)。结论该院老年患者血培养病原菌以革兰阴性菌为主,鲍氏不动杆菌耐药率最高。需引起临床的高度重视,采取合理的防治措施,根据药敏结果选择针对性的敏感抗菌药物。

多部门联合干预对重症监护病房多重耐药菌感染管理的效果研究

目的探讨多部门联合干预措施对重症监护病房多重耐药菌感染管理的应用效果。方法通过现况调查、原因分析以及实行多种干预措施等,比较某院综合ICU干预前后的多重耐药菌感染情况。结果干预前该院综合ICU 2016年1—4季度多重耐药菌感染率分别为16.82%、17.17%、23.40%和21.62%,干预后2017年4季度和2018年1-3季度多重耐药菌感染率明显降低,分别为4.63%、2.08%、2.44%和4.90%。干预前总感染率19.71%,干预后总感染率3.50%,明显低于干预前,差异具有统计学意义(χ^(2)=54.498,P<0.001)。结论通过多部门联合干预,运用质量持续改进的方法能有效降低ICU多重耐药菌感染率,进而有效控制医院感染的发生。

医院综合ICU环境表面清洁效果持续质量改进的研究与分析

目的研究持续质量改进措施对综合ICU环境表面清洁效果的改善情况。方法设定2016年10月-2016年12月为持续质量改进前,2017年1月-2017年9月为持续质量改进阶段。制定质量改进措施并实施,对综合ICU环境表面进行采样并鉴定细菌菌种。按季度统计综合ICU住院患者医院感染率、下呼吸道感染率、泌尿道感染率和血流相关感染率。结果持续质量改进前环境表面采样合格率为58. 49%,持续质量改进阶段环境表面采样合格率为76. 92%,两组数据比较差异有统计学意义(χ2=19. 36,P <0. 01)。环境表面细菌菌种鉴定主要为金黄色葡萄球菌、鲍曼不动杆菌和白假丝酵母菌。经持续质量改进后,检出菌菌株数均显著下降。综合ICU住院患者医院感染率、下呼吸道感染率、泌尿道感染率和血流相关感染率在持续质量改进阶段也呈下降趋势。结论持续质量改进措施可以有效提高综合ICU环境清洁效果,减少环境表面致病菌,降低住院患者医院感染率。

食管癌术后医院感染特点与影响因素分析

目的 了解食管癌术后医院感染的特点,分析影响因素。方法 回顾性研究2017年1月—2018年12月在医院胸外科实施食管癌根治术患者的临床资料,对术后发生医院感染的相关影响因素进行单因素和多因素分析。结果 240例食管癌手术患者,发生医院感染81人次,感染92例次,例次感染率38.33%。主要感染部位为下呼吸道、胸膜腔和手术部位。共培养分离病原菌107株,其中革兰阴性菌73株,以鲍曼不动杆菌、肺炎克雷伯菌和大肠埃希菌为主;革兰阳性菌25株,以金黄色葡萄球菌和表皮葡萄球菌为主;真菌9株。多因素Logistic回归分析显示,年龄、术后带管进行呼吸支持、术后抗菌药物使用天数≥10 d、住院天数是患者术后发生医院感染的独立影响因素(P<0.05)。结论 食管癌患者术后医院感染常见部位为下呼吸道,感染病原菌以革兰阴性菌为主,多种因素与感染发生有关。