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.

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.

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.

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

信息流广告的重定向策略研究:用户动态信息加工视角

信息流媒体平台的动态性和响应性,一方面赋予了用户自由筛选和屏蔽信息的权利,另一方面也让平台可以根据用户反馈及时调整后续信息的推送策略。当前,用户屏蔽信息流广告的行为非常普遍,然而传统广告回避的研究结论无法平移到信息流广告的重定向情境。本研究将从用户动态信息加工的视角出发,探讨用户在不同信息加工模式下的信息流广告屏蔽与重定向策略。通过对大量观察数据的挖掘分析并结合实验室实验,结果表明:对于处于快处理模式屏蔽信息流广告的用户,后续为其推送与屏蔽广告不同品类的产品广告能使其拥有更积极的广告态度;对于处于慢处理模式屏蔽信息流广告的用户,后续为其推送与屏蔽广告相同品类的产品广告能使其拥有更积极的广告态度。研究结论对信息流广告投放实践具有管理启示作用。

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。

横突间阻滞的围手术期应用进展

超声引导下横突间阻滞(ITPB)作为一种新型的改良椎旁神经阻滞技术,可在围手术期实现超前镇痛,从而减轻手术刺激,降低患者应激反应,对患者术后康复具有重要意义。ITPB具有操作简便、安全性高、并发症少等优势,因可提供与椎旁阻滞非劣效的镇痛效果而受到广泛关注,近年逐渐应用于各类外科手术的术中麻醉。因此,深入研究超声引导下ITPB的作用机制及镇痛效果、全面了解其在围手术期应用的安全性和可行性,可为临床选择使用ITPB提供新思路。

关于一维排它过程平稳blocking测度的存在性

本文证明了具有非平移不变转移速率p(x ,y)的一维排它过程平稳blocking测度的存在性 ,推广了文献 [5]中的有关结果 .

基于改进S^(3)控制结构的批次过程控制系统架构研究

传统的连续过程控制系统不能很好地实现工艺与控制相分离,生产效率低下。针对此问题,提出了一种基于改进调度器、选择器和同步器(scheduler selector synchronizer,S^(3))控制结构的批次过程控制系统架构。该架构在调度层中建立了基于G描述语言的组件描述和基于改进S^(3)控制结构的调度器,使工艺与控制相分离;在数据层中建立了相逻辑接口表;在控制层中基于ISA S88标准和IEC 61499标准建立了离散化的控制功能块,并设计了S^(3)控制结构的选择器和同步器实现工艺的可重构。实验结果表明,所提批次过程控制系统架构在不改变控制程序的情况下完成了不同工艺流程的控制任务,实现了工艺与控制相分离,并缩短了工艺流程修改时间。

PET片材爽滑抗粘连母料的开发与应用

聚对苯二甲酸乙二酯(PET)片材表面有较高的摩擦系数,导致材料容易附着在设备表面出现粘连现象,不利于PET片材的生产、二次加工、下游包装、贮藏和使用。为了解决这一问题,研究了爽滑抗粘连母料对PET片材摩擦性能、吸塑使用性能和光学性能的影响。抗粘连颗粒可以使片材表面凸起、减少接触面。爽滑剂可以降低摩擦系数。二氧化硅作为无机类抗粘连剂,能使片材形成稳定的抗粘连效果。复合蜡(包含不同熔点的几种蜡)可以在片材中形成爽滑梯度,有效降低摩擦系数。选择二氧化硅和复合蜡为主要成分开发了性能优异的爽滑抗粘连母料。测试结果表明,添加自制爽滑抗粘连母料可以显著减小PET片材的摩擦系数,表现出优异的滑动性能。在进一步的吸塑成型工艺过程中,自制爽滑抗粘连母料显著改善了PET片材的抗粘连效果,使吸塑后的杯子展现出优异的叠压取出性能。光学性能测试结果表明,自制爽滑抗粘连母料可在提升PET片材爽滑抗粘连性能的同时最大程度地削弱对PET片材光学性能产生的负面影响。自制爽滑抗粘连母料的使用性能达到或超过了同类优质进口母料的性能。

A BLOCK GENERALIZED MINIMUM BACKWARD (BGMBACK) ERROR ALGORITHM FOR NONSYMMETRIC LINEAR SYSTEMS

Many applications require the solution of large nonsymmetric linear systems with multiple right hand sides. Instead of applying an iterative method to each of these systems individually, it is often more efficient to use a block version of the method that generates iterates for all the systems simultaneously. In this paper, we propose a block version of generalized minimum backward (GMBACK) for solving large multiple nonsymmetric linear systems. The new method employs the block Arnoldi process to construct a basis for the Krylov subspace K m(A, R 0) and seeks X m∈X 0+K m(A, R 0) to minimize the norm of the perturbation to the data given in A.

An estimation model for the fragmentation properties of brittle rock block due to the impacts against an obstruction

Mountain hazards with large masses of rock blocks in motion – such as rock falls, avalanches and landslides – threaten human lives and structures. Dynamic fragmentation is a common phenomenon during the movement process of rock blocks in rock avalanche, due to the high velocity and impacts against obstructions. In view of the energy consumption theory for brittle rock fragmentation proposed by Bond, which relates energy to size reduction, a theoretical model is proposed to estimate the average fragment size for a moving rock block when it impacts against an obstruction. Then, different forms of motion are studied, with various drop heights and slope angles for the moving rock block. The calculated results reveal that the average fragment size decreases as the drop height increases, whether for free-fall or for a sliding or rolling rock block, and the decline in size is rapid for low heights and slow for increasing heights in the corresponding curves. Moreover, the average fragment size also decreases as the slope angle increases for a slidingrock block. In addition, a rolling rock block has a higher degree of fragmentation than a sliding rock block, even for the same slope angle and block volume. Finally, to compare with others' results, the approximate number of fragments is estimated for each calculated example, and the results show that the proposed model is applicable to a relatively isotropic moving rock block.

基于Block-Gibbs抽样的无限潜Dirichlet分配模型的高分辨率全色遥感影像非监督分类

通过引入文本检索算法中的无限潜Dirichlet分配(infinite Latent Dirichlet Allocation,即iLDA)模型,对遥感影像进行建模以获取地物的统计分布及其共生关系,从而实现遥感影像非监督分类。首先,将遥感影像有重叠地划分成一组大小相等的影像块(文集)。其次,以iLDA为基础,构建"像元"(视觉词)、"影像块"(文档)和"地物类"(主题)之间的条件概率关系,并采用Block-Gibbs抽样的方法来估计模型参数,从而构建基于BlockGibbs抽样的iLDA遥感影像非监督分类模型(Block-Gibbs based iLDA,即BG-iLDA)。最后,通过对BG-iLDA模型的逼近求解实现高分辨率遥感影像的非监督分类。实验结果表明,本文提出的基于BG-iLDA的面向对象非监督分类方法相对传统的K-means等算法精度更高,更能有效区分"同谱异物"的地物。

Pre-processing filter design at transmitters for IBI mitigation in an OFDM system

In order to meet the demands for high transmission rates and high service quality in broadband wireless communication systems, orthogonal frequency division multiplexing （OFDM） has been adopted in some standards. However, the inter-block interference （IBI） and inter-carrier interference （ICI） in an OFDM system affect the performance. To mitigate IBI and ICI, some pre-processing approaches have been proposed based on full channel state information （CSI）, which improved the system performance. A pre-processing filter based on partial CSI at the transmitter is designed and investigated. The filter coefficient is given by the optimization processing, the symbol error rate （SER） is tested, and the computation complexity of the proposed scheme is analyzed. Computer simulation results show that the proposed pre-processing filter can effectively mitigate IBI and ICI and the performance can be improved. Compared with pre-processing approaches at the transmitter based on full CSI, the proposed scheme has high spectral efficiency, limited CSI feedback and low computation complexity.

Truncated Geometric Bootstrap Method for Time Series Stationary Process

This paper introduced a bootstrap method called truncated geometric bootstrap method for time series stationary process. We estimate the parameters of a geometric distribution which has been truncated as a probability model for the bootstrap algorithm. This probability model was used in resampling blocks of random length, where the length of each blocks has a truncated geometric distribution. The method was able to determine the block sizes b and probability p attached to its random selections. The mean and variance were estimated for the truncated geometric distribution and the bootstrap algorithm developed based on the proposed probability model.

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。

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.