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合并或不合并慢性疾病的阑尾炎经腹腔镜手术和开放手术结果的回顾性研究

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合并或不合并慢性疾病的阑尾炎经腹腔镜手术和开放手术结果的回顾...

作者： salma JUMA ali 山东大学

学位级别：硕士

背景:尽管医学诊疗有了很大的进步,阑尾炎仍然是急腹症最常见的原因之一。由于高血压及其他一些心血管疾病会损害心肺功能,阑尾炎患者的既往疾病史对其预后有直接或间接的影响。因此,我们将合并有慢性疾病的患者与既往体健的患者对一对... 详细信息

背景:尽管医学诊疗有了很大的进步,阑尾炎仍然是急腹症最常见的原因之一。由于高血压及其他一些心血管疾病会损害心肺功能,阑尾炎患者的既往疾病史对其预后有直接或间接的影响。因此,我们将合并有慢性疾病的患者与既往体健的患者对一对比研究目的:1.确定样本特征2.比较高血压和非高血压患者腹腔镜和开腹手术的疗效(手术时间、术后镇痛使用、术后喂养和住院时间)。3.探讨高血压患者和非高血压患者的术后并发症。4.探讨高血压和非高血压患者的死亡率。方法:回顾性收集山东大学齐鲁医院急诊外科2014-2018年行阑尾炎手术的成年患者。获得的患者资料为;年龄、性别、既往腹部手术史、ASA危险评分、术前白细胞及中性粒细胞计数、影像学诊断、阑尾切除术类型、术中诊断、术后镇痛使用、术后进食时间、住院时间、术后并发症及死亡率。纳入标准为有脐周腹痛、发热史的满18岁的成人患者;术前超声或CT确诊阑尾炎的患者(蜂窝织样阑尾炎、坏疽性阑尾炎、穿孔阑尾炎、阑尾脓肿)。排除标准为18岁以下患者、因其他原因切除阑尾及阑尾先天性缺失患者。描述性数据用平均数±标准差表示。分别采用独立t检验和卡方检验分析连续变量和分类变量之间的相关性。单因素方差分析比较两组以上的平均值。采用SPSS(Statistical Package for Social Science,SPSS)16版对数据进行分析,p值<0.05为有统计学意义。结果:本研究随机选取2014年至2018年在齐鲁医院行阑尾切除术的139例患者作为研究对象。平均年龄为42.2±15.657岁(18-82岁)。62.6%的患者年龄在18-45岁之间,而65岁及以上的患者仅占11.5%。54%是男性。27.3%(n=38)有高血压病史。84.2%接受腹腔镜手术(n=117),15.8%(n=22)为开腹手术。在术中诊断方面,42.4%为急性蜂窝织样阑尾炎(59例),15.1%为急性坏疽性阑尾炎(21例),7.9%为穿孔性阑尾炎(11例),34.5%为阑尾脓肿(48例)。术后并发症发生率1.4%(n=2),其中1例为IAA,1例为脂肪液化。非高血压患者开腹手术持续时间最长,为117.5±56.679分钟。在高血压患者中,腹腔镜手术患者持续时间为88.92±38.525分钟,开腹患者为82.08±33.538分钟,两者之间存在统计学差异,p值<0.05。镇痛用的平均持续时间为0.48±0.774天。合并高血压的患者中,开腹患者镇痛持续时间为0.75±1.357天,腹腔镜患者为0.5±0.99天。在未合并高血压的患者中,腹腔镜患者镇痛用的最短,为0.44±0.618天,开腹组为0.5±0.527天,p值<0.05。平均住院日是8.09±4.051天(4-28天)。非高血压患者中,开腹患者住院时间最长为10.4±4.502天,腹腔镜患者为7.26±3.235天。在高血压患者中,开腹患者为10.08±4.944天,腹腔镜患者为9.15±5.213天,P值<0.05。除了阑尾切除术的类型和高血压状况外,我们还发现了其他与不良手术结果相关的因素。包括较高的ASA风险评分(ASA Ⅲ),术前白细胞计数高和坏疽性阑尾炎。结论:尽管气腹对心肺生理有所影响,但我们的研究表明腹腔镜手术在患者预后上更有优势性。我们发现影响阑尾炎患者手术预后主要因素包括合并高血压的患者行开腹手术、ASA评分较高、术前白细胞计数较高及术中诊断为坏疽性阑尾炎

关键词：阑尾炎高血压腹腔镜手术开腹手术临床疗效

也门白领员工心理资本对知识分享行为的影响研究—考虑动机的中介作用

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也门白领员工心理资本对知识分享行为的影响研究—考虑动机的中介...

作者： salma ali ABDO AL-MAITAMI（麦莎莉）天津大学

学位级别：硕士

在知识经济时代,全球化和日益激烈的竞争使各个组织想要获得与其他类似组织相比的潜在竞争优势的处境变得复杂。由于组织之间激烈竞争的加剧,员工知识共享的概念已成为每一个组织发展的必要实践条件。在这种发展中,心理资本对员工的表... 详细信息

在知识经济时代,全球化和日益激烈的竞争使各个组织想要获得与其他类似组织相比的潜在竞争优势的处境变得复杂。由于组织之间激烈竞争的加剧,员工知识共享的概念已成为每一个组织发展的必要实践条件。在这种发展中,心理资本对员工的表现产生了积极的贡献。此外,心理资本(Psy Cap),起到了中间的激励作用,对员工的知识分享行为的正向作用也被注意到。从文献中可以看出,心理资本与知识共享之间存在着积极而必要的关系。基于这两个相互关联的概念的重要性,本研究旨在探讨在也门公司,动机在心理资本(Psy Cap)与知识共享行为(KSB)之间起到的中介作用。各组织目前的行政部门力求创造一个适当和成功的工作环境。大多数组织不断发展工作环境,使其对员工产生更加积极的影响,这有助于提高员工的积极性和效率。积极的环境可以使员工感到满意,并充满希望和决心。也门组织希望了解员工的情况、需求,以及他们分享知识的动机,以使企业保持竞争力。研究的目标人群是在也门注册的300家公司。在本研究中,本人选择了描述性研究设计。本研究主要依靠从各公司收集的二手数据。本研究采用定量和定性数据,在社会科学家统计软件包(SPSS 19.0版)中,采用描述性统计进行分析。在300份问卷中,有251名被调查者填写了问卷,并将问卷寄回给本人。数据收集于也门的上市公司和私营企业。本文运用结构方程模型(SEM)检验研究假设模型,该模型显示了四个心理资本维度,知识共享行为和动机的中介作用之间的相关性。结果表明,自我效能感、希望、复原力和乐观主义与员工的知识共享行为有关,动机在也门公司扮演了中介作用。此外,通过中介作用分析,确定了动机对员工心理和知识分享行为的中介效应。员工的心理资本(Psy Cap)和知识共享行为对于组织的调研和发展至关重要。实证研究结果表明,公司应增强员工的动力,以改善他们的心理和知识共享行为。此外,公司应给予员工工作空间,并感谢他们对工作的真诚。也门的企业对员工的需求是多样化的。根据人力资源的观点,激励是任何个人的无形资产,不仅与心理资本影响有关,而且有助于加强员工的知识分享行为。此外,本研究提取的结果表明,在缺乏额外资源的情况下,员工的积极性能够促进他们的反馈查询和更多地参与工作。因此,员工的心理资本可以通过员工的积极性得到蓬勃发展。从另一个意义上讲,员工的激励过程有利于提高员工对工作的参与度,丰富心理资本对知识共享行为的影响。

关键词：心理资本(Psy Cap) 知识共享行为(KSB) 动机的中介作用

Nonlinear Coordinated Passivation Control of Single Machine Infinite Bus Power System with Static Var Compensator

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1557-1565页

作者： salma Keskes Souhir Salleem Larbi Chrifi-Alaoui Mohamed Ben ali Kammoun Electric Machines and Power Networks Control Laboratory from the Electrical Engineering Department National Engineering School of Sfax Innovative Technologies Laboratory University of Picardy Jules Verne

We propose a nonlinear coordinated control of the generator excitation and the static var compensator(SVC) in order to enhance the transient stability and voltage regulation of power system by the passivation approach. SVC is installed in the middle of the transmission line of power system and consists of a single machine infinite bus(SMIB) system. The design of the proposed controller consists of two parts. On one hand,the generator excitation controller is designed based on a backstepping controller. On the other hand, the conception of SVC control input is based on the coordinated passivation approach,which can guarantee the asymptotic stability of the closed-loop system. The simulation results show the effectiveness of the proposed controller compared with other methods, which ensures better performance than the uncoordinated control when the system is subjected to a disturbance.

关键词： Coordinated control passivation approach transient stability control design

A Deep-CNN Crowd Counting Model for Enforcing Social Distancing during COVID19 Pandemic: Application to Saudi Arabia’s Public Places

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Computers, Materials & Continua 2021年第2期66卷 1315-1328页

作者： salma Kammoun Jarraya Maha Hamdan Alotibi Manar Salamah ali Department of Computer Science FCITKing Abdulaziz UniversityJeddahSaudi Arabia MIRACL-Laboratory Sfax UniversitySfaxTunisia Department of Computer Science King Khalid UniversityAbhaSaudi Arabia

With the emergence of the COVID19 virus in late 2019 and the declaration that the virus is a worldwide pandemic,health organizations and governments have begun to implement severe health precautions to reduce the spread of the virus and preserve human *** enforcement of social distancing at work environments and public areas is one of these obligatory *** management is one of the effective measures for social *** reducing the social contacts of individuals,the spread of the disease will be immensely *** this paper,a model for crowd counting in public places of high and low densities is *** model works under various scene conditions and with no prior knowledge.A Deep CNN model(DCNN)is built based on convolutional neural network(CNN)structure with small kernel size and two *** increase the efficiency of the model,a convolutional neural network(CNN)as the front-end and a multi-column layer with Dilated Convolution as the back-end were ***,the proposed method accepts images of arbitrary sizes/scales as inputs from different *** evaluate the proposed model,a dataset was created from images of Saudi people with traditional and non-traditional Saudi *** model was also trained and tested on some existing *** to current counting methods,the results show that the proposed model has significantly improved efficiency and reduced the error *** achieve the lowest MAE by 67%,32%.and 15.63%and lowest MSE by around 47%,15%and 8.1%than M-CNN,Cascaded-MTL,and CSRNet respectively.

关键词： CNN crowd counting COVID19

Modeling the dynamical behavior of the interaction of T-cells and human immunodeficiency virus with saturated incidence

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Communications in Theoretical Physics 2024年第3期76卷 1-14页

作者： Salah Boulaaras Rashid Jan Amin Khan ali Allahem Imtiaz Ahmad salma Bahramand Department of Mathematics College of ScienceQassim UniversityBuraydah51452Saudi Arabia Institute of Energy Infrastructure(IEI) Department of Civil EngineeringCollege of EngineeringUniversiti Tenaga Nasional(UNITEN)Putrajaya CampusJalan IKRAM-UNITEN43000 KajangSelangorMalaysia Department of Mathematics University of SwabiSwabi 23561Pakistan Department of Mathematics College of SciencesQassim UniversitySaudi Arabia Institute of Informatics and Computing in Energy(IICE) Universiti Tenaga NasionalKajangSelangorMalaysia Department of Political Science Bacha Khan University CharsaddaCharsadda 24420KPK Pakistan

In the last forty years,the rise of HIV has undoubtedly become a major concern in the field of public health,imposing significant economic burdens on affected ***,it becomes imperative to undertake comprehensive investigations into the mechanisms governing the dissemination of HIV within the human *** this work,we have devised a mathematical model that elucidates the intricate interplay between CD4^(+)T-cells and viruses of HIV,employing the principles of fractional *** production rate of CD4^(+)T-cells,like other immune cells depends on certain factors such as age,health status,and the presence of infections or ***,we incorporate a variable source term in the dynamics of HIV infection with a saturated incidence rate to enhance the precision of our *** introduce the fundamental concepts of fractional operators as a means of scrutinizing the proposed HIV *** facilitate a deeper understanding of our system,we present an iterative scheme that elucidates the trajectories of the solution pathways of the *** show the time series analysis of our model through numerical findings to conceptualize and understand the key factors of the *** addition to this,we present the phase portrait and the oscillatory behavior of the system with the variation of different input *** information can be utilized to predict the long-term behavior of the system,including whether it will converge to a steady state or exhibit periodic or chaotic oscillations.

关键词： HIV infection fractional-calculus dynamics of HIV iterative scheme dynamical behaviour mathematical model fractional derivatives

New Bi-metallic Single Source Precursors for the Deposition of Thin Films of Semiconductor Ceramics

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Journal of Materials Science & Technology 2007年第2期23卷 196-200页

作者： U.salma M.Mazhar J.I.Akhter Z.ali Department of Chemistry Quaid-i-Azam UniversityIslamabad 45320Pakistan Physics Division Pakistan Institute of Nuclear Science and TechnologyP.O.NiloreIslamabadPakistan

Stable binary single source precursors （SSP） for the deposition of thin films of ceramic semiconductors of composition SnO·GeO were synthesized by close circuit chemical vapour deposition （CCCVD） method. Elemental analysis and spectroscopic techniques were used to characterize the precursors. Scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS） were employed to characterize the thin films. Resistivity measurements were conducted to show that the films are of semiconducting nature.

关键词： Single source precursors CCCVD Organotin carboxylates

Stay-Green Not Always Stays Green

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Molecular Plant 2014年第8期7卷 1264-1266页

作者： salma Balazadeh University of Potsdam Institute of Biochemistry and Biology Karl-Liebknecht-Str.24–25 Haus 20 14476 Potsdam-Golm Germany Plant Signalling Group Max Planck Institute of Molecular Plant Physiology Am Mühlenberg 1 14476 Potsdam-Golm Germany

Senescence is a highly regulated recycling process in which nutrients are translocated from deteriorating leaves to newly developing leaves, flowers, seeds, or roots （Lim et al., 2007; Gregersen et al., 2013）. Chloroplast dismantling, a major event during senescence, involves the degradation of light-harvesting chlorophyll a/b-binding proteins （LHCPs） and the release of free chlorophyll （Chl） which is catabolized to phototoxic, cell-damaging Chl breakdown intermediates.

关键词： pull rope green

ENERGY DISTRIBUTION OF BACKSCATTERED ELECTRONS FROM HEAVY METALS

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 345-350页

作者： K. salma Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China

The full energy distribution of backscattered electrons from the elastic peak do wn to the true-secondary electron peak for heavy metals, Ta, W, Pt and Au, in Au ger electron spectroscopy in the EN(E) mode has been studied with a Monte Carlo simulation method, which includes cascade-secondary-electron production. The sim ulation model is based on the use of a dielectric function for describing inelas tic scattering and secondary excitation, and on the use of Mott cross sections f or elastic scattering. A systematic comparison between the calculated and experi mental spectra measured with a cylindrical mirror analyzer has been made for pri mary energies ranging from 1 to 5keV. Excellent agreement was obtained for these heavy metals on the backscattering background at primary energies in the keV re gion. A significant contribution of cascade secondary electrons to the measured spectra on the low-energy side was found.

关键词： backscattered electrons Monte Carlo AES heavy metal

SURFACE EXCITATION PARAMETER IN QUANTITATIVE SURFACE ANALYSIS BY ELECTRON SPECTROSCOPY

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Acta Metallurgica Sinica(English Letters) 2005年第3期18卷 313-318页

作者： K. salma Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics University of Science and Technology of China

The investigation of influence of surface effects on the energy spectra of elect rons is essential for comprehensive understanding of electron-solid interactions as well as quantitative analysis. The accuracy of the analysis depends on the m odels for elastic and inelastic interactions. Electrons impinging on a solid or escaping from it suffer losses in the surface layer. The energy loss spectra the refore have contributions from surface excitations. The role of surface excitati ons is characterized by surface excitation parameter (SEP), which indicates the number of surface plasmons created by an electron crossing the surface. The imag inary part of complex self-energy of an electron is related to the energy loss c ross section. SEP is numerically computed using self-energy formalism and compar ed with the results as described and calculated by different workers.

关键词： surface plasmons surface excitations parameter self-energy