Spleen-preserving distal pancreatectomy from multi-port to reducedport surgery approach

BACKGROUND Minimally invasive pancreatic surgery via the multi-port approach has become a primary surgical method for distal pancreatectomy(DP)due to its advantages of lower wound pain and superior cosmetic results.Some studies have applied reduced-port techniques for DP in an attempt to enhance cosmetic outcomes due to the minimally invasive effects.Numerous recent review studies have compared multi-port laparoscopic DP(LDP)and multi-port robotic DP(RDP);most of these studies concluded multi-port RDP is more beneficial than multi-port LDP for spleen preservation.However,there have been no comprehensive reviews of the value of reduced-port LDP and reduced-port RDP.AIM To search for and review the studies on spleen preservation and the clinical outcomes of minimally invasive DP that compared reduced-port DP surgery with multi-port DP surgery.METHODS The PubMed medical database was searched for articles published between 2013 and 2022.The search terms were implemented using the following Boolean search algorithm:(“distal pancreatectomy”OR“left pancreatectomy”OR“peripheral pancreatic resection”)AND(“reduced-port”OR“single-site”OR“single-port”OR“dual-incision”OR“single-incision”)AND(“spleen-preserving”OR“spleen preservation”OR“splenic preservation”).A literature review was conducted to identify studies that compared the perioperative outcomes of reduced-port LDP and reduced-port RDP.RESULTS Fifteen articles published in the period from 2013 to 2022 were retrieved using three groups of search terms.Two studies were added after manually searching the related papers.Finally,10 papers were selected after removing case reports(n=3),non-English language papers(n=1),technique papers(n=1),reviews(n=1),and animal studies(n=1).The common items were defined as items reported in more than five papers,and data on these common items were extracted from all papers.The ten studies included a total of 337 patients(females/males:231/106)who underwent DP.In total,166 patients(females/males,106/60)received multi-port LDP,126(females/males,90/36)received reduced-port LDP,and 45(females/males,35/10)received reduced-port RDP.CONCLUSION Reduced-port RDP leads to a lower intraoperative blood loss,a lower postoperative pancreatic fistula rate,and shorter hospital stay and follow-up duration,but has a lower spleen preservation rate.

Multi-port cavity model and low-level RF systems design for VHF gun

Very high frequency(VHF) photocathode guns have excellent performance and are being increasingly selected as electron sources for high-repetition-rate X-ray free-electron lasers. As a highly loaded quality factor cavity, the VHF gun requires high stability in the amplitude and phase of the cavity field. However, the gun is microwave powered by two solid-state power sources through two separate power couplers. The input difference between the two power couplers will influence the stability of the cavity field. To systematically study this influence and obtain measurement formulae, a multi-port VHF gun LCR circuit model is built and analyzed. During the warm-up condition, the cavity structure will be deformed due to the large-scale change in the cavity temperature. Then, the deformation will result in cavity resonant frequency changes. To prevent the mechanic tuner from suffering damages due to the frequent and long-distance movement for correcting the cavity resonant frequency, a self-excited loop(SEL) control system is considered for changing the loop phase and make the loop frequency follow the resonant frequency. In this study, a steady-state model of the VHF gun cavity is built for obtaining the optimal input coupler coefficient and the stability requirement of the forward voltage. Then, the generator-driven resonator and SEL control system, which combine with the VHF multiport modeling, are modeled and simulated. The simulated results show that the SEL system can perfectly operate in the process of condition and warm-up.

用于测试FPGA的Multi-Port下载方式

研究利用V93000测试平台对FPGA芯片实现下载,该测试平台通过自身通道存储空间来存储测试向量,以Multi-Port方式进行下载。并以Xilinx的Virtex-Ⅱ Pro系列XC2VP30芯片进行了实例验证,实验表明此种方式在实际应用中解决了测试平台向量许可有限的弊端,也可用于其他FPGA芯片的测试、研究与验证。

REALIZATION OF ARBITRARY TRANSFER MATRIX WITH ACTIVE MULTI-PORT NETWORK

A new simple method in which arbitrary transfer function matrix is realized withactive multiple port network instead of computer simulating is proposed. The active multipleport network is carried on through state feedback and state cross output for RC ladder network.The main process is to determine coefficients of each adder. Finally, an example is given forillustration.

90% <i>SNR</i>Improvement with Multi-Port Hall Plates

For Hall plates, the ratio of signal over thermal noise is determined by material properties, thickness, layout geometry, magnetic field, and the electric power at which the plate is operated. For traditional Hall plates with four contacts, the optimum choice is a symmetrical device with medium-sized contacts. This paper shows that the signal-to-noise-ratio (SNR) can be further increased by up to 90% for Hall plates with more than four contacts. Supply currents flow through several pairs of contacts, while a signal conditioning circuit taps output voltages at all pairs of contacts and sums them up. We compute the total thermal noise of the sum of correlated noise voltages and relate it to the total magnetic sensitivity. We also prove that for electrically linear devices a spinning current scheme cancels out zero point errors (offset errors) in a strict sense. All our investigations use the definite resistance matrix of multi-port Hall plates. We develop an analytical theory based on recent advances in the theory of Hall plates, and then we compute the integrals and matrices numerically for symmetrical Hall plates with six to 40 contacts. We also present measurements in accordance with our theory.

Difficulties in Parameters Identification of Traction Transformer Multi-port Equivalent Scheme with Hidden Construction Defect

While modeling a power supply system for an electric railway traction, knowing equivalent circuits of locomotives supplied this way is an essential issue. In alternating current traction, it is important to diagnose inter alia processes taking place in transformers installed on electric vehicles. This article presents specific phenomena occurring during the work of mono-phase, multi-winding, multisystem （systems AC： 50 Hz, 16.7 Hz） laboratory traction transformer. It also shows difficulties encountered during the process of identifying multi-port equivalent scheme＇s elements of the described device, in which a construction defect occurs.

On Distributed Concurrent Multi-Port Router Test System

This paper presents a framework of the distributed concurrent multi-port-testing test system (CMPT-TS) for IP routers under development at Sichuan Network Communication Key Laboratory. Having analyzed the actuality of concurrent testing for routers, this paper develops a distributed architecture of CMPT-TS and discusses its functional components in detail. Moreover, a new test definition language, CMPT definition language, is also introduced simply.

Multi-port Network Modeling and Stability Analysis of VSC-MTDC Systems

The voltage source converter based multi-terminal high-voltage direct current(VSC-MTDC)system has attracted much attention because it can achieve the interconnection between AC grids.However,the initial phases and short-circuit ratios(SCRs)of the interconnected AC grids cause the steady-state phases(SSPs)of AC ports in the VSC-MTDC system to be different.This can lead to the issues such as mismatches in multiple converter reference frame systems,potentially causing inaccuracies in stability analysis when this phenomenon is disregarded.To address the aforementioned issues,a multi-port network model of the VSC-MTDC system,which considers the SSPs of the AC grids and AC ports,is derived by multiplying the port models of different subsystems(SSs).The proposed multi-port network model can accurately describe the transmission characteristics between the input and output ports of the system.Additionally,this model facilitates accurate analysis of the system stability.Furthermore,it identifies the key factors affecting the system stability.Ultimately,the accuracy of the proposed multi-port network model and the analysis of key factors are verified by time-domain simulations.

考虑移动氢能存储的港口多能微网两阶段分布鲁棒优化调度

为有效应对海上风电固有的间歇及波动性给港口多能微网带来的不确定性风险,提出一种考虑移动氢能存储的港口多能微网两阶段分布鲁棒优化调度模型。首先,结合Wasserstein距离实现风电出力概率分布模糊集的精确刻画,并通过非参数核密度估计拟合海上风电预测误差概率分布,获得不同置信水平下风电出力区间及场景。其次,分析氢能船舶、汽车等移动氢能存储资源对间歇性风电出力的能源存储潜力,并结合用能心理、交通属性差异,将两者分别建模为激励型、价格型需求响应,实现港口移动氢能存储灵活性资源的高效聚合。再次,针对含移动氢能存储的港口多能微网,构建基于概率分布模糊集的日前-日内两阶段分布鲁棒优化调度模型,并运用线性决策规则与强对偶理论将其转换为混合整数线性规划模型求解。最后,基于海上风电实测数据进行仿真验证。结果证明,移动氢能存储可显著提升港口多能微网的低碳灵活性,所提模型在兼顾港口多能微网经济性的同时,可进一步保证风电不确定性风险下的鲁棒性。

具备自适应重合闸能力的多端口混合式直流断路器

为解决柔性直流电网中混合式直流断路器成本高以及盲目重合闸的问题,提出了一种具备自适应重合闸能力的多端口混合式直流断路器。所提断路器能够在能量耗散期间旁路故障线路中的限流电抗器,配合电容充电回路的导通,将本应经避雷器耗散的限流电抗器能量转移到电容中,从而有效减少了故障隔离时间与避雷器能量耗散压力,并为故障性质的判别提供了能量支持。同时,该断路器通过共享主断路器的方式实现故障隔离,结合避雷器泄能需求的下降,大大降低了断路器的制造成本,在经济性方面优势明显。此外,该断路器利用故障识别电流与电容电压在永久性故障与瞬时性故障下的幅值差异来识别故障性质,实现了自适应重合闸,操作简单且易于控制。最后,利用PSCAD/EMTDC在三端MMC柔性直流系统环境下对所提方案的有效性进行了仿真验证,并通过与其他方案的对比分析,证明了所提方案的优越性。

含柔性直流的港口交直流电力系统储能容量配置研究

文中以储能系统全生命周期内总成本最小、碳排放量最少为目标,结合港口的电力系统架构特性构建超级电容与蓄电池混合储能系统的容量配置模型.采取K-means++聚类方法提取港口风光出力的典型日进行计算,并利用CPLEX求解器完成模型求解.案例计算结果显示,使用此方法进行储能容量配置可在储能系统全生命周期内节省购电成本约4.65万元,减少碳排放约1.77万吨.

全流程一站式医技预约平台的设计与应用

目的结合院内实际情况设计全流程一站式医技预约平台,以提高医技科室的工作效率,与住院门诊协同发展,提升患者满意度。方法基于JAVA开发平台,使用全新一代的中台架构,构建多端口、全流程、一站式医技预约平台,采用WebService技术对接相关系统并映射到中台,运用动态规划算法为患者推荐最优的检查预约方案。结果多端口平台设计满足不同情况下患者进行的全流程医技预约,对全院各医技检查资源实施统筹管控,显著缩短了患者各项检查候诊时长及患者转运时长(P<0.05);医技科室效率得到大幅度提升,检查例数显著增加;患者满意度从21.44%提升至92.86%,且差异均有统计学意义(P<0.05)。结论全流程一站式医技预约平台极大地提高了检查设备的使用率,通过合理安排检查时间显著改善了医疗服务质量,间接提升了门诊接诊能力和住院病床周转率,推进了智慧医院的信息化进程。

集装箱港口多码头泊位联合分配优化研究

多码头泊位联合分配是港口资源整合、提升服务水平的重要手段。针对集装箱港口多码头泊位计划,考虑不同码头泊位条件、岸桥能力等因素,构建多码头泊位-岸桥集成分配数学模型。设计改进灰狼算法(IGWO),利用离散化映射进行编码设计,基于优胜劣汰法实现种群动态进化。设计算例,将IGWO与果蝇算法和粒子群算法进行对比。结果显示:IGWO算法优化结果分别提升16.6%和21.1%;利用IGWO对不同船舶到港密度泊位算例进行求解,其中,多码头泊位分配可有效减少总时间成本及延误船舶数量,节省岸线资源约10%。结果表明:设计的模型及算法可有效解决多码头泊位联合分配问题。

“近零碳”目标下港区多能互补标准体系研究

利用多能互补技术推动能源结构调整是实现港口绿色低碳发展的有效手段。本研究以国内主要沿海港口为对象,聚焦港区建设、运营、管理等环节开展多能互补技术标准研究,基于系统工程学方法构建港区多能互补标准体系,利用港区承载的可再生能源自然禀赋与清洁能源应用,通过多能互补技术的能源结构优化减少交通运输行业碳排放,推动双碳目标实现。

多采样频率合并单元设计与实现

国内智能变电站推广使用的合并单元装置普遍采用4 kHz采样频率,可以满足间隔层保护测控的需求;电能质量或PMU等对采样频率有更高的要求,通常要求12.8 kHz或者更高频率。对此,提出一种共口传输多采样频率数据的方案,采用一个合并单元装置满足变电站不同专业的采样需求。测试表明,该方案适用于组网方式,对于帧间隔及延时要求不高的场合,减少了采集装置数量,提高了采样数据的共享性。

单孔与多孔亚肺叶切除术治疗早期非小细胞肺癌的疗效探讨

目的:探讨单孔与多孔胸腔镜亚肺叶切除术治疗早期非小细胞肺癌的临床疗效。方法:选取2020年1月至2022年12月收治的150例早期非小细胞肺癌患者,按随机数字法分为单孔组、两孔组与三孔组,每组50例。比较三组手术情况、术后恢复情况、住院时间、并发症情况、术后第1天与第3天疼痛视觉模拟评分及术前、术后第3天血清肿瘤坏死因子-α、白介素-6、超敏C反应蛋白水平;分别于术前1 d、术后3个月检测第1秒用力呼气容积、用力肺活量、最大通气量。结果:单孔组术中出血量、术后胸腔引流量少于两孔组、三孔组,术后第1天、第3天疼痛评分低于另两组,术后引流时间、住院时间短于另两组,术后第3天肿瘤坏死因子-α、白介素-6、超敏C反应蛋白水平均低于另两组(P<0.05);3组间术后1个月第1秒用力呼气容积、用力肺活量、最大通气量差异无统计学意义(P>0.05);单孔组术后并发症发生率为6.00%,低于两孔组(20.00%)与三孔组(24.00%),差异有统计学意义(P<0.05)。结论:单孔胸腔镜亚肺叶切除术治疗早期非小细胞肺癌的手术效果与多孔胸腔镜手术相近,可缩短术后引流时间、住院时间,降低术后疼痛与炎症反应程度。

双碳背景下港口作业设备更新多目标优化模型

在碳达峰碳中和的背景下,港口能源动力系统清洁化、低碳化、高效化发展成为趋势,对排放超标的港口作业设备进行更新是港口节能减碳的重要措施。本文在分析港口主要作业设备种类和排放的基础上,以设备更新的成本控制最低和减碳效果最佳为目标函数,以更新设备费用、规划期降碳效果和年度降碳效果为约束条件,构建非线性港口作业设备更新多目标优化模型,并利用Gu⁃robi求解器进行模型求解。本文以连云港港“十四五”设备更新为案例,构建连云港港“十四五”设备更新优化模型,经过求解得出连云港港2021~2025年的港口作业设备最佳更新方案,方案表明:连云港港在2021~2025年的设备更新最佳总投资为14361.82万元,使得二氧化碳排放量降低7839.92吨,单位吞吐量二氧化碳排放量下降率40%。

港船多能源融合技术体系构建与运行模式研究

为充分利用港口地区丰富的风、光可再生资源,构建了由“源网荷储”四部分组成的港船多能源融合系统,建立了状态监测与能量管理系统保证港船多能源融合系统的安全运行,制定了包括横向多能互补和纵向“源网荷储”协调互动的港船多能源融合系统运行模式。港船多能源融合系统可以实现新能源、清洁能源的综合利用,减少CO_(2)等温室气体的排放,有助于“碳达峰、碳中和”目标的实现。

北部湾港大型深水航道远期适应性及通航标准仿真分析

以北部湾港北海港域30万吨级深水航道工程为背景,采用智能体仿真建模方法,建立北海港域铁山进港航道船舶进出港、锚泊、航行和码头停泊作业全过程仿真模型。通过仿真定量分析港口通过能力和航道服务水平等指标,结合航道平面尺度分析,提出湾外主航道远期推荐尺度和通航标准。基于港口通过能力瓶颈分析和支航道通航标准优化仿真分析,提出主要支航道北暮航道部分航段通航标准优化建议。结果表明,湾外主航道2035年达到(10+5)万t船双向通航,2050年进一步达到(10+10)万t船双向通航的推荐通航标准;北暮航道1段通航标准由15万t船舶单向通航优化为兼顾2万t船舶双向通航,对提升港口通过能力具有较好效果。

轴向柱塞泵配流副椭圆开口偏置类抛物线微织构多目标优化

为了提高轴向柱塞泵配流副承载性能、抗摩擦磨性能及容积效率,以某型斜盘式轴向柱塞泵配流盘为原型开展研究。首先,依据正交实验理论采用CFD方法研究椭圆开口偏置抛物线微织构(Elliptic opening offset parabola micro texture, EOOPT)形状参数对轴向柱塞泵配流副承载压强、摩擦因数的影响规律,并联合运用神经网络和遗传算法对EOOPT的形状参数进行优化设计。其次,运用响应面分析方法研究EOOPT分布参数对配流副承载压强、摩擦因数和泄漏量的影响规律,并对形状参数进行优化设计。最后对最优特征参数EOOPT织构化的柱塞泵配流副和未织构的相关性能进行对比分析,结果表明,前者的承载压强较后者提高11.23%,摩擦因数和泄漏量分别减低16.67%和2.96%。