Midpoint transverse process to pleura block for postoperative analgesia following laparoscopic renal cyst decortication:Two case reports

BACKGROUND The midpoint transverse process to pleura(MTP)block,a novel technique for thoracic paravertebral block(TPVB),was first employed in laparoscopic renal cyst decortication.CASE SUMMARY Thoracic paravertebral nerve block is frequently employed for perioperative analgesia during laparoscopic cyst decortication.To address safety concerns associated with TPVBs,we administered MTP blocks in two patients prior to administering general anesthesia for laparoscopic cyst decortication.The MTP block was performed at the T9 level under ultrasound guidance,with 20 mL of 0.5%ropivacaine injected.Reduced sensation to cold and pinprick was observed from the T8 to T11 dermatome levels.Immediately postoperative Numeric Pain Rating Scale scores were 0/10 at rest and on movement,with none exceeding a mean 24 h numeric rating scale>3.CONCLUSION MTP block was effective technique for providing postoperative analgesia for patients undergoing laparoscopic renal cyst decortication.

Research on Welding Quality Traceability Model of Offshore Platform Block Construction Process

Quality traceability plays an essential role in assembling and welding offshore platform blocks.The improvement of the welding quality traceability system is conducive to improving the durability of the offshore platform and the process level of the offshore industry.Currently,qualitymanagement remains in the era of primary information,and there is a lack of effective tracking and recording of welding quality data.When welding defects are encountered,it is difficult to rapidly and accurately determine the root cause of the problem from various complexities and scattered quality data.In this paper,a composite welding quality traceability model for offshore platform block construction process is proposed,it contains the quality early-warning method based on long short-term memory and quality data backtracking query optimization algorithm.By fulfilling the training of the early-warning model and the implementation of the query optimization algorithm,the quality traceability model has the ability to assist enterprises in realizing the rapid identification and positioning of quality problems.Furthermore,the model and the quality traceability algorithm are checked by cases in actual working conditions.Verification analyses suggest that the proposed early-warningmodel for welding quality and the algorithmfor optimizing backtracking requests are effective and can be applied to the actual construction process.

Numerical simulation of the blocking process of gelled particles in porous media with remaining polymers

Gelled particles can be transferred deeply inside oil reservoirs to block water channels due to their physicochemical characteristics, including swelling, deformation, and synergetic effect （reacting with polymers）, and then the injection profiles are significantly modified. At present, research on gelled particles is mainly focused on laboratory studies of drive mechanisms, and rarely on mathematical models describing the blocking process of gelled particles. In this paper, the blocking process of gelled particles is divided into two sub-processes： deposition and desorption due to particle deformation. A mathematical model based on filtration theory is proposed considering the effect of characteristics of gelled particles on the blocking process. Blocking laws were simulated and researched using the mathematical model. Results of the simulation of the blocking of gelled particles are quite consistent with the experimental results, which confirms the reliability of the mathematical model developed.

Application of complex inoculants in improving the processability of grey cast iron for cylinder blocks

Effect of several complex inoculants on mechanical properties, process-ability and sensibility of grey cast iron used in cylinder block were investigated. The experimental results showed that the grey cast iron treated with 60%FeSi75+40%RE complex inoculants has tensile strength consistently at about 295 MPa along with good hardness and improved metallurgy quality. While the grey cast iron inoculated with 20%FeSi75+80%Sr compound inoculants has the best process-ability, the lowest cross-section sensibility and the least microhardness difference. The wear amount of the drill increases correspondingly with the increase of the microhardness difference of matrix structure, indicating the great effect of homogeneousness of matrix structure in the grey cast iron on the machinability of the grey cast iron.

Effect of Nonlinear Dynamic Process on Formation and Breakdown of Blocking

With the L-P approximate method(variation of parameter method), a barotropic channel model in β-plane is used to study the effect of nonlinear interaction between two waves with different scales on the formation of blocking. The approximate analytical solution, which can describe the process of the blocking formation, maintenance and breakdown, has been obtained by using the method of aproximate expansion. The importance of nonlinear interaction between two waves with different scales is stressed in the solution. The result suggests that the nonlinear interaction is the main dynamic process of the blocking formation. Some required conditions of blocking formation are also discussed.

The Mesozoic Welding Process between South and North Dabie Blocks：An Evidence from Pb Isotopes of Yanshanian Granites

The Pb isotope compositions of K-feldspar in granites is paid more and more geologists'attention,due to their importance of tracer.It is a fact that South Dabie Block(SDB)and North Dabie Block(NDB)had exited since Indosinian epoch(Wang et al.,1992;Cong et al,1994;Zhai et al.,1995;Chen et al.1995;Zhang et al,1996,Wang et al,1997).However,the welding process between SDB

基于层次分析灰色定权聚类的煤层气开发甜点预测方法——以柿庄北区块为例

随着煤层气产业的发展以及非常规油气勘探开发一体化的要求,当前煤层气的勘查评价工作逐渐由勘探选区向开发甜点选区推进。然而,受限于勘探开发阶段或资料占有程度,当前多数的选区评价体系对煤储层的可改性和煤层气的可采性考虑不足,在指导开发区井位优选或加密井方面效果不佳。基于沁水盆地柿庄北区块100余口煤层气参数井和开发井资料,分析区内3号煤层煤层气开发的资源条件、储层可改造性和煤层气可采性,采用层次分析和灰色定权聚类方法构建评价模型,评价了煤层气开发甜点区,为区内新井和加密井的部署提供依据。评价模型以煤层含气量、煤厚反映煤层气资源条件;综合考虑地应力环境和岩石力学性质,构建储层综合可改造性参数,评价储层可改造性;使用原始结构煤和碎裂煤占比、临储比和储层原始渗透率反映煤层气的可采性。每个参数采用word聚类方法分级,每个点位(每口井)计算出综合优度并排序,最终划分出煤层气开发甜点区。评价结果表明,研究区中部综合优度大于65的地区为进一步开展开发工作的甜点区。

基于GeoSMA-3D的岩质边坡异形滑动面搜索方法

针对岩体结构面发育特征的不确定性,提出一种岩质边坡异形滑动面搜索方法 .以Ⅲ,Ⅳ结构面岩体为研究对象,结合GeoSMA-3D(geotechnical structure and model analysis-3D)程序中块体切割和关键块体判别模块,将滑坡体设定为几何多面体.岩体的内部块体组合形成多面体,以多面体的表面表征滑动面.引入层次分析法,建立滑动面准定量化评价准则.以小盘岭边坡为例,将异形滑动面判定准则导入GeoSMA-3D程序中,研究表明边坡存在6个关键块体,组合滑动面有3个,潜在滑动面安全系数为1.046,滑动面几何形态与实际边坡拟合度高达95%,验证了岩质边坡滑动面搜索方法的合理性.

热流道板真空钎焊有限元模拟与分析

采用BNi-2镍基钎料对热流道板进行真空钎焊,须根据钎焊件设定加热工艺曲线。加热工艺曲线的设定是钎焊过程最重要的环节之一,决定着钎焊的质量和效率。该文结合真空加热的特点及钎焊要求,运用Ansys有限元软件数值模拟的方法,对壁厚、体积较大的多层热流道板真空钎焊进行仿真分析,通过对比不同工艺方案及不同钎焊件的模拟结果,探究真空钎焊过程升温规律,从而调整各阶段的相关参数及制定合理的加热工艺曲线,避免了现场反复调试参数造成的资源浪费,节约了时间和成本,提高了效率。此外,通过在实际钎焊试验过程中布置热电偶对钎焊件测量温度,并与数值模拟结果对比,两者基本吻合,验证了有限元分析的准确性,能为之后其他零部件的真空钎焊提供参考。

基于层次分析熵权组合法-云模型的充填管道堵塞风险评估

为确定充填管道堵塞的主要影响因素,采用层次分析法、熵权法和云模型理论,进行充填管道堵塞风险评估.选取充填料浆体积分数、充填倍线等12项指标,用层次分析熵权组合法得到各指标的综合权重系数后与云模型方法耦合,得到综合确定度,以判定充填管道堵塞的风险等级.依据现场资料和数据,对3处采用充填采矿法的矿山进行评估.结果表明,贡北金矿、新城金矿和开阳磷矿的充填管道堵塞风险等级分别为Ⅱ、Ⅲ、Ⅱ级,与其他方法进行对比,证明该方法精确度较高.

煤矿采动稳定区煤层气开发区块经济评价技术

针对我国煤矿采动稳定区煤层气开发区块评价技术缺乏,难以有效指导经济开发应用这一问题,基于煤层气开发效果与综合效益,分析了采动稳定区煤层气开发区块评价关键参数,构建了考虑技术进步等动态影响因素的煤层气开发区块经济评价指标体系,采用层次分析方法获得了各单项指标的相对权重,并提出了开发区块最大隶属原则经济评价方法。应用试验表明,该经济评价方法可为煤矿采动稳定区煤层气开发决策提供可靠指导。

术前腰方肌阻滞与横突间阻滞对妇科腹腔镜手术患者术后疼痛和早期恢复的影响

目的研究术前腰方肌阻滞与横突间阻滞对妇科腹腔镜手术患者术后疼痛和早期恢复的影响。方法以2018年12月-2022年12月北京市朝阳区妇幼保健院麻醉科收治的80例全身麻醉下行妇科腹腔镜手术患者为研究对象,随机分为腰方肌阻滞组(Q组,40例)和横突间阻滞组(T组,40例),两种阻滞均在麻醉诱导前完成。记录两组术中及术毕24、48 h内阿片类药物用量,术中心血管不良反应发生率,术后24、48 h恶心呕吐发生率,肠道排气时间以及首次下床时间。采用QoR-40量表评估术后3 d两组患者满意度。结果与Q组相比,T组术中和术后24 h舒芬太尼用量减少,术中低血压的发生率升高(10.2%vs 35%),术后3 d的QoR-15评分升高[(166.26±10.91)分vs(174.52±11.77)分],首次下床时间缩短[(18.2±4.5)h vs(16.0±4.2)h],差异均有统计学意义(P<0.05)。两组肠道排气时间和术后恶心呕吐发生率,差异无统计学意义(P>0.05)。结论在妇科腹腔镜手术中使用横突间阻滞较腰方肌阻滞可减少围术期阿片类药物用量,提高术后患者满意度。

护士主导的连续收肌管阻滞镇痛管理流程在膝关节置换术后患者中的应用研究

目的探讨疼痛专科护士主导的连续收肌管阻滞镇痛管理流程在膝关节置换术后患者中的应用效果。方法依据共识—行动—反馈—讨论的实施策略制订以疼痛专科护士为主导的连续收肌管阻滞镇痛的管理流程。通过便利抽样法,选取2023年8月—11月在浙江省某三级甲等医院某院区行膝关节置管术后行连续收肌管阻滞镇痛的172例患者为研究对象,比较流程应用前后48 h内镇痛不全发生率和时效指标的差异。结果护士主导的流程应用后,试验组36 h内活动时镇痛不全发生率、不良反应发生率、患者等待麻醉科处理时间显著低于对照组(p<0.05)。结论护士主导连续收肌管阻滞镇痛管理流程的应用可明显降低膝关节置管术后镇痛不全的发生率,降低置管后的不良反应发生率,提高医疗效率。

雷达对抗中基于FPGA输入分块重映射的数据处理方法

雷达对抗中,干扰机侦收雷达的信号,经AD采样后输入FPGA进行处理并产生干扰信号。FPGA平台利用Xilinx等官方提供的FFTIP核对高速ADC输出的数据进行FFT处理时,需要进行“并行-串行”的数据预处理,降低了处理速度,同时也没有对FPGA内部资源进行最大化利用。基于以上问题,提出一种基于FPGA输入分块重映射的数据处理方法。该方法通过数据输入重映射模块将输入雷达数据优化为并行分块的数据流格式,再通过FFT蝶形网络输出离散傅里叶变换数据,最后进行并行结果输出。试验证明,本方法能有效节省FPGA的运算时间,提高雷达数据处理速度,优化利用了FPGA内部资源,具有实时性好、灵活性高的特点。

气液混输管道水合物冻堵模拟及解堵方案研究

文章针对气液混输管道气体携液能力较弱、低洼处积液较多,使管道生成水合物风险增加,管道输送效率降低的问题,采用OLGA软件对处于沙漠环境中的从1号阀室到分输站之间的管线的水合物形成风险部位进行定量计算,得出了甲醇抑制剂的浓度要求。基于分析结果提出了“加注水合物抑制剂+清管器推送甲醇段塞化冻/全面清除积液”的解堵工艺,为混输管道地解堵提供了可靠的理论和技术支撑。

微生物碳酸盐生产工厂的构成、特征及沉积学意义——以河南云梦山剖面为例

【目的】“碳酸盐(生产)工厂”研究强调生物群落对碳酸盐生产过程以及规模的调控和特异性影响,在深入认识碳酸盐岩成因和形成机制方面具有重要价值,是碳酸盐沉积学领域关注热点和重要方向。虽然该概念的正式提出已有二十多年历史,但如何从工厂角度解读地质历史时期,特别是深时特异性、大规模碳酸盐岩的发育过程和影响因素方面仍缺乏系统性认识。【方法】以河南云梦山剖面寒武系崮山组为例,利用多尺度、网格定量化评价方法对微生物碳酸盐生产工厂的样式、内部结构、建造过程等方面进行了详细阐述。【结果】研究区微生物碳酸盐生产工厂以底栖微生物群落为主要建造者,形成样式包括叠层石、凝块石、树枝石、均一石以及微生物诱导沉积构造(MISS)。伴生的颗粒类型包括鲕粒、球粒、生屑、竹叶状内碎屑和微生物岩角砾,主要分布于工厂建造格架间。微生物碳酸盐生产工厂发育具期次性,单期工厂发育规模较小(海底至水面高度不足1 m)但空间延伸广,包括半球状、穹窿状、板状等宏观形态;其内部结构包括少量单独的建造样式,以及广泛发育的垂向复合形式。【结论】通过分析影响工厂发育的各类因素,局限潮坪环境下较高的营养水平对微生物碳酸盐生产工厂的繁盛可能起到了主要作用,而古丈期总体海侵背景造成适宜微生物碳酸盐生产工厂发育的环境消失,导致工厂最终关闭。相关工作的开展提供了一个与现代澳大利亚Hamelin Pool微生物碳酸盐生产工厂非常相似的古代实例,对认识寒武纪碳酸盐生产工厂类型、特征和演化规律方面具有较好的参考价值。

缸体铸件气孔缺陷成因分析及改进措施

2.5 L柴油机缸体铸件在工艺验证和小批量生产阶段,水套部位气孔为最突出的铸造缺陷,主要是由于水套砂芯发气未有效排出和水套结构孤立高点铁液温度低所致。通过增加内浇道优化浇注系统、设置排气通道回路增加水套砂芯排气、提高浇注温度等措施,有效解决了水套的气孔缺陷问题。经生产验证,气孔缺陷废品比例大幅度下降,由原来的11%左右下降到了0.6%左右。

超声引导喙突锁骨下入路和肌间沟入路臂丛神经阻滞在行上肢手术患者中的应用效果分析

目的:分析超声引导喙突锁骨下入路和肌间沟入路臂丛神经阻滞在行上肢手术患者中的应用效果。方法:选取2017年4月—2022年4月于广西医科大学第一附属医院拟在臂丛神经阻滞下行上肢手术的患者60例作为研究对象,按照随机双盲法分成观察组和对照组,各30例。观察组采用喙突锁骨下入路,对照组采用肌间沟入路臂丛神经阻滞,比较两组麻醉效果。结果:两组手术镇痛所需时间比较,差异无统计学意义(P>0.05);观察组进针次数和阻滞操作时间长于对照组,感觉阻滞持续时间短于对照组(P<0.05)。观察组尺神经、正中神经、前臂内侧皮神经及臂内侧皮神经的感觉阻滞起效时间均短于对照组(P<0.05)。两组不良反应总发生率比较,差异无统计学意义(P>0.05)。结论:超声引导喙突锁骨下入路和肌间沟入路臂丛神经阻滞在行上肢手术患者的麻醉中均安全有效,临床应根据患者情况、手术部位及操作者的熟练程度选择不同的阻滞方法。

烯烃嵌段共聚物的合成方法及应用

烯烃嵌段共聚物是近年来新材料领域的热门研究方向,独特的嵌段结构使其具有更优异的性能,应用范围更广,商业价值较高。本文综述了热塑性弹性体OBC的合成方法及发展现状,以及在不同领域中的应用。

支持BPR的流程仿真在OpenBlock中的设计和实现

企业流程重组(BusinessProcessReengineering,BPR)作为一种有效的手段,已成为当今企业关心的重点问题。企业迫切需要支持BPR的易用、有效的建模仿真工g。该文简要介绍了企业流程重组的基本概念,分析了具有排队系统特点的一般企业流程的功能,讨论了支持BPR的流程仿真问题;重点利用框图建模方法来支持BPR流程仿真,在OpenBlock建模仿真环境中设计并实现了BPR模型体系;最后,给出一个电话呼叫中心的企业流程建模仿真实例。