浸没燃烧式气化器SCV的RAM分析及可用度优化

浸没燃烧式气化器(SCV)是液化天然气LNG应急调峰站的关键核心系统,系统中出现设备故障会导致天然气供应中断,将造成显著社会影响与生产损失。为了评估SCV系统的生产性能及提高运行稳定性,提出并建立SCV-RAM分析模型,应用蒙特卡洛模拟仿真定量辨识SCV的瓶颈单元设备并针对性设计改进方案。结果表明,SCV系统易发生故障的单元按贡献度依次分别是:助燃空气单元、循环冷却水单元,其中导致系统不可用度增大的具体关键设备为水泵、电机以及鼓风机。据此对关键设备的预防性维修间隔进行优化,SCV系统的全寿命周期统计可用度从90.17%提高到94.93%,总停机时间减少了3478h。分析结果有助于优化SCV系统的维修资源分配,为实现SCV系统长周期稳定运行提供技术支持。

多腔梯度序贯充压联合Caprini RAM量表指导下的康复方案对肺癌患者术后深静脉血栓的影响

目的探讨多腔梯度序贯充压联合Caprini RAM量表指导下的康复方案对肺癌患者术后深静脉血栓的影响。方法选择2020年1月-2023年1月我院收治的肺癌患者150例,将2020年1月-2021年12月收治的75例患者列为常规组,2022年1月-2023年1月收治的75例患者列为观察组。常规组实施多腔梯度序贯充压治疗与传统护理,观察组实施多腔梯度序贯充压联合Caprini RAM量表指导下的康复方案。观察两组DVT预防知识、结局相关指标和护理满意度。结果观察组干预后DVT预防知识得分明显高于常规组,患者下肢DVT发生率、D-二聚体、下肢周径差均明显低于常规组,住院时间短于常规组(P<0.05),观察组护理满意度明显高于常规组(P<0.05)。结论多腔梯度序贯充压联合Caprini RAM量表指导下的康复方案可提高肺癌患者术后DVT预防知识水平,促进康复进程,提升患者满意度。

Modelling Dry Port Systems in the Framework of Inland Waterway Container Terminals

Overcoming the global sustainability challenges of logistics requires applying solutions that minimize the negative effects of logistics activities.The most efficient way of doing so is through intermodal transportation(IT).Current IT systems rely mostly on road,rail,and sea transport,not inland waterway transport.Developing dry port(DP)terminals has been proven as a sustainable means of promoting and utilizing IT in the hinterland of seaport container terminals.Conventional DP systems consolidate container flows from/to seaports and integrate road and rail transportation modes in the hinterland which improves the sustainability of the whole logistics system.In this article,to extend literature on the sustainable development of different categories of IT terminals,especially DPs,and their varying roles,we examine the possibility of developing DP terminals within the framework of inland waterway container terminals(IWCTs).Establishing combined road–rail–inland waterway transport for observed container flows is expected to make the IT systems sustainable.As such,this article is the first to address the modelling of such DP systems.After mathematically formulating the problem of modelling DP systems,which entailed determining the number and location of DP terminals for IWCTs,their capacity,and their allocation of container flows,we solved the problem with a hybrid metaheuristic model based on the Bee Colony Optimisation(BCO)algorithmand themeasurement of alternatives and ranking according to compromise solution(i.e.,MARCOS)multi-criteria decision-making method.The results from our case study of the Danube region suggest that planning and developingDP terminals in the framework of IWCTs can indeed be sustainable,as well as contribute to the development of logistics networks,the regionalisation of river ports,and the geographic expansion of their hinterlands.Thus,the main contributions of this article are in proposing a novel DP concept variant,mathematically formulating the problems of its modelling,and developing an encompassing hybrid metaheuristic approach for treating the complex nature of the problem adequately.

循证护理在降低肺癌患者PORT并发症中的应用效果

目的:评估循证护理在降低肺癌患者植入式静脉输液港(PORT)相关并发症中的应用效果。方法:选取2021年1月—2023年6月江苏省肿瘤医院确诊肺癌并行PORT植入化疗的150例患者,根据护理方式的不同分为对照组和观察组,每组75例。对照组给予常规护理,观察组给予循证护理。比较两组的并发症发生率、情绪状态、知识掌握度评分。结果:观察组PORT相关性并发症总发生率低于对照组,差异有统计学意义(P<0.05)。护理前,两组不良情绪评分比较,差异无统计学意义(P>0.05);护理后,观察组焦虑自评量表(SAS)、抑郁自评量表(SDS)评分低于对照组,差异有统计学意义(P<0.05)。观察组知识掌握度评分均高于对照组,差异有统计学意义(P<0.05)。结论:循证护理在降低肺癌患者PORT并发症发生率、改善患者心理状态和生活质量方面效果显著,值得临床中应用。

基于port write事件触发的RapidIO节点动态管理方法

针对现有大规模的综合化电子信息系统中RapidIO节点管理实时性不强、CPU资源占用多的问题,提出了一种基于port write事件触发的RapidIO节点动态管理方法。该方法利用RapidIO交换芯片的port write包上报退网或者入网的节点信息,通过该信息动态管理RapidIO网络中的所有节点。工程应用实测结果表明,该方法实时性高,CPU资源占用少。

Basilic vein variation encountered during surgery for arm vein port:A case report

BACKGROUND Venous variations are uncommon and usually hard to identify,and basilic vein variation is particularly rare.Basilic vein variation usually presents without any clinical symptoms and is often regarded as a benign alteration.This case was a patient with congenital basilic vein variation encountered during surgery for an infusion port.CASE SUMMARY We documented and analyzed an uncommon anatomical variation in the basilic vein encountered during arm port insertion.This peculiarity has hitherto remained undescribed in the literature.We offer remedial strategies for addressing this anomaly in the future and precautionary measures to circumvent its occurrence.We conducted a comprehensive review of analogous cases in the literature,offering pertinent therapeutic recommendations and solutions,with the aim of enhancing the efficacy and safety of future arm port implantations.CONCLUSION Venous variation is rare and requires detailed intraoperative and postoperative examination to ensure accuracy,so as not to affect subsequent treatment.

The Impact of Privatization on Terminal Efficiency: A Case Study of Tema Port

Port and terminal efficiency are of utmost importance to the container shipping industry due to their significance in enhancing the competitive advantage of ports within a region. Consequently, there have always been notable variations of studies around it. This paper analyzes the impact of privatization on terminal efficiency using the Port of Tema as a Case Study. The main objective of this paper is to analyze the efficiency trends of the public and private terminals in the port over the years. To achieve this objective, DEA-CCR methodology was employed to calculate the annual technical efficiency trends of the private and public terminals using four input variables and three output variables. The main results of the paper indicated that the public and private terminals were efficient for multiple years. However, the efficiency scores over the years demonstrated inconsistency, exhibiting notable fluctuations. The findings of this study will aid policymakers across the region on policies relating to the efficiency and ownership structure of ports and terminals.

AGV Scheduling Optimization of Automated Port Based on Disruption Management

The recent rapid development of China’s foreign trade has led to the significant increase in waterway transportation and automated container ports. Automated terminals can significantly improve the loading and unloading efficiency of container terminals. These terminals can also increase the port’s transportation volume while ensuring the quality of cargo loading and unloading, which has become an inevitable trend in the future development of ports. However, the continuous growth of the port’s transportation volume has increased the horizontal transportation pressure on the automated terminal, and the problems of route conflicts and road locks faced by automated guided vehicles (AGV) have become increasingly prominent. Accordingly, this work takes Xiamen Yuanhai automated container terminal as an example. This work focuses on analyzing the interference problem of path conflict in its horizontal transportation AGV scheduling. Results show that path conflict, the most prominent interference factor, will cause AGV scheduling to be unable to execute the original plan. Consequently, the disruption management was used to establish a disturbance recovery model, and the Dijkstra algorithm for combining with time windows is adopted to plan a conflict-free path. Based on the comparison with the rescheduling method, the research obtains that the deviation of the transportation path and the deviation degree of the transportation path under the disruption management method are much lower than those of the rescheduling method. The transportation path deviation degree of the disruption management method is only 5.56%. Meanwhile, the deviation degree of the transportation path under the rescheduling method is 44.44%.

Seroprevalence Survey of HIV and Hepatitis B Virus and Behavioral Characteristics among Heavy Truck Drivers along Port Sudan-Khartoum Highways

The prevalence of human immunodeficiency virus (AIDS) and hepatitis B virus among heavy truck drivers and their assistants has been well documented globally in correlation with their behavioral characteristics. The present study aimed to screen for human immunodeficiency virus (HIV), hepatitis B virus (HBV), and behavioral characteristics among heavy truck drivers in Port Sudan. A cross-sectional study was conducted on 274 heavy truck drivers and their assistants who used the highway Port Sudan-Khartoum in Port Sudan city during 2019-2021. Data on behavioral characteristics and substance use habits were collected using a structured questionnaire, and an ELISA test was used to screen for HIV and HBV infections in the study participants. The chi-square test, odds ratio, and confidence intervals were used to find the association between behavioral characteristics and seropositive HIV/HBV. Of the 274 enrolled participants, the seroprevalence rates of HIV were 2.7% and HBV was 23.7%. Ninety-four (34.3%) of them had a history of high-risk sexual behavior outside of marriage;only two (0.7%) used condoms;14.2% of participants reported alcohol use;and 1.1% reported drug use. Univariate analysis revealed that having a sex history outside of marriage with ≥1 sex partner and never using a condom with a spouse or casual partner were significant risk factors for HIV and HBV among drivers. Fortunately, we found that most of the drivers reported low alcohol and drug use. Concerning this study, the seroprevalence of HIV and HBV is highly associated with a history of having sex outside of marriage and sexual behavior among truck drivers and assistances. Additional studies are needed to further investigate other STIs and behavioral characteristics associated with factors in truck drivers/assistance in different truck stop regions in Sudan.

Function Evolution and Landscape Planning Strategy of Inland Rivers in Beilun Port City of Ningbo

In the history, the main roles of inland rivers in Beilun Port City of Ningbo were desalination,blocking tides, shipping, and flood control. Nowadays, with the continuous spread and deepening ofurbanization, the ecological environment of river courses has been destroyed. In the past, remediationmeasures based on engineering and technology played a certain role, but can not “cure the root cause”. Itshould respect the historical evolution process of river courses, and highlight the ecological service functionand leisure tourism value of river courses from the coordination perspective of urban and rural ecologicalenvironment, economic industries, society and culture in the planning ideas of ecology, production, andlife integration. Four aspects of the measures are as below: protecting and repairing the ecological matrixof river courses;building green space system and maintaining flood control functions through the waternetwork;protecting cultural heritage along the rivers;developing waterfront leisure tourism scenic area.

Impact of coupling coordination development of port and city environments on urban economic competitiveness:Evidence from the coastal port cities in eastern China

Promoting the coupling coordination development of port and its hinterland city environments is an important way to improve urban economic competitiveness.Based on relevant data of 13 coastal port cities in eastern China from 2000 to 2018,this study explores the coupling coordination development of port and city environments and its impact on urban economic competitiveness by constructing the coupling coordination degree model and the panel threshold model.The research results show that:(1)In terms of the coupling coordination development of port and city environments,most coastal ports and their hinterland cities are in a state of moderate or serious disorder.Overall,the degree of coupling coordination of port and city environments needs to be further improved;(2)The coupling coordination degree of port and city environments has a significant impact on urban economic competitiveness,and this effect gradually increases with the development of the ports and the urban economy.Among the variables that impact the urban economic competitiveness,fixed assets investment and foreign trade are significant factors that can enhance urban economic competitiveness.(3)At present,there is a“U-shaped”relationship between the coupling coordination degree of port-city environments and the urban economic competitiveness.This relationship lies on the right side of the inflection point of the“U-shaped”curve.Therefore,following the concept of assigning priority to ecological development,expanding fixed assets investment and actively developing foreign trade can further enhance the urban economic competitiveness.

浅析基于RAMS的轨道交通车辆状态评估方法

随着轨道交通的快速发展,对其关键部件可靠性、可用性、安全性以及维修性的评估方法提出了更高的要求。因此提出了基于RAMS的轨道交通车辆状态评估方法,应用RAMS对关键部件进行状态评估,其中利用安全性确定部件维修方式,可靠性确定部件维修时间间隔,可用性判断部件维修状态。

基于双口RAM接收并处理1553B总线数据的方法研究

为了保证主机板和1553B板通过双口RAM(Random Access Memory,随机存取存储器)进行1553B总线通信时的正确性和可靠性,提出了一种利用双口RAM接收并处理1553B总线数据的方法,用于实现1553B的BC(Bus Controller,总线控制器)功能。该方法对双口RAM中的地址按照子地址号进行地址分配,通过建立相同子地址序号的数据链表和建立环形缓冲区,完美解决了发送BC→RT(Remote Terminal,远程终端)报文时相同子地址数据覆盖和主机端发送的子地址序号顺序与1553B板端发送的子地址序号顺序不一致等问题。

轨道交通装备制造企业的RAMS体系分析

本文以轨道交通装备制造企业RAMS体系为研究对象,论述了建立RAMS体系的必要性,分析了轨道交通装备制造企业RAMS体系管理组织、体系文件和审核等要素,对轨道交通装备制造企业RAMS体系落实情况进行了简要分析,为轨道交通装备制造企业完善RAMS体系、建立切实有效的执行方法提供了参考。

Innovative Exploration and Research on International Exchange and Cooperation Mechanisms under the Background of Hainan Free Trade Port

In order to explore and foster innovation in international exchange and cooperation,this study focuses on the background of the construction of the Hainan Free Trade Port.It delves into the current development status,characteristic demands,and potential challenges of its international exchange and cooperation mechanisms.Through a comprehensive analysis of relevant cases,survey questionnaires,and literature,this study aims to provide feasible innovative models and recommendations to promote the sustained development of the Hainan Free Trade Port in the field of international exchange and cooperation,injecting new vitality into China’s economic globalization.This exploration contributes to a deeper understanding of the development of free trade ports and provides insights and references for other countries and regions.

轨道交通车辆系统RAMS管理技术应用研讨

轨道交通是人们交通出行的主要方式之一,同时也是交通事业建设的重点内容,如何保证轨道交通车辆安全运行,做好车辆系统安全管理至关重要。RAMS管理属于主动性隐患管理工具,将其投入到轨道交通车辆系统中,能够及时发现和消除安全隐患,最大程度上提升轨道交通车辆安全性和可靠性。尽管当前国内多数轨道交通车辆系统中开始运用RAMS管理进行可靠性、安全性管理,但却面临着相关主体单位的RAMS管理意识薄弱的问题,种种问题还有待进一步完善。本文就轨道交通车辆系统RAMS管理技术应用情况展开分析,并分析轨道交通车辆安全性、可靠性和可维修性内容,提出合理的控制手段付诸实践。

面向可变长度数据的高效ORAM方案

数字经济的发展使得数据体量增长急剧加速,数据安全也成为了当前社会中重要的关注点。为了保护数据隐私安全,不经意随机访问机(ORAM,Oblivious Random Access Machine)方案被提出来保护不可信内存中的访问模式。本文提出一种全新的ORAM协议,与以往只能存储固定长度分块的方案不同,本文提出的方案支持存储不同长度的数据,以更高的效率保证攻击者无法通过观察访问推测出隐私信息。该方案重塑了初始的二叉树结构,并采用加法同态加密方案来实现恒定的通信复杂性。该方案通过可变长度数据提升了多项性能,对于小型客户端存储,该ORAM协议的网络带宽比RingORAM低30%,比HIRBORAM低40%。同时,该ORAM协议极大地节省了客户端计算开销,并利用第三方(可信代理)提高了存储容量。最后证明了本方案过程中读取、写入以及驱逐操作的安全性。

同质化管理模式在胃肠癌PORT患者冲管护理中的应用

目的:探讨同质化管理模式在胃肠癌静脉输液港(PORT)患者冲管护理中的应用效果。方法:将2019年6月1日~2022年12月1日收治的90例胃肠癌PORT患者作为研究对象,根据随机数字法将患者分为对照组和观察组各45例,对照组实施常规护理模式,观察组实施同质化管理模式;比较两组患者冲管满意度、不良事件发生率、护理人员知识掌握度及工作质量评分情况。结果:观察组患者冲管满意度高于对照组(P<0.05);观察组不良事件发生率低于对照组(P<0.05);观察组护理人员工作质量评分及知识掌握度高于对照组(P<0.05)。结论:实施同质化管理模式可降低胃肠癌PORT患者冲管中的不良事件发生率,提升冲管满意度,从而提高护理人员知识掌握度及工作质量。

PICC和PORT静脉输液技术综合输液效果比较

目的对PICC和PORT的综合效果指数进行测算,以评价两种中心静脉输液技术的综合输液效果。方法抽取上海市某三级甲等医院采用PICC或PORT行中长期静脉输液的肿瘤患者为研究对象,通过回顾性队列研究和横断面调查收集两种静脉输液技术的安全性、有效性及患者体验相关指标,测算并比较两种中心静脉输液技术在总留置时间、留置3~个月、6~个月及9~12个月的综合效果指数。结果PICC和PORT置管患者分别纳入377例、293例,PICC留置时间显著短于PORT,置管及维护过程中次要并发症发生率显著高于PORT,生活质量得分显著低于PORT(均P<0.05)。PICC在总留置时间、留置3~个月、6~个月及9~12个月的综合效果指数值均小于PORT。结论PORT的综合输液效果优于PICC,从输液效果角度,建议优先选择PORT作为中长期静脉输液的血管管路。

北桥与DUAL PORT RAM间接口控制的FPGA设计

介绍了一种MIPS体系结构下,北桥在SDRAM的操作规范下控制dual port RAM的新型系统结构设计方案,结合实际实现过程,较清楚地突出了设计的创新点,并介绍了测试结果,结论是该设计完全适用于MIPS系统下的数据交换系统,达到了国外同类产品的速度性能要求。