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Individualized Design of the Ventilator Mask based on the Residual Concentration of CO2

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Computer Modeling in Engineering & Sciences 2018年第11期117卷 157-167页

作者： Zhiguo Zhang Zhenxiao Li Yifei Zhang zhenze wang Minzhou Luo Jiangsu Key Laboratory of Special Robot Technology College of Mechanical and Electrical EngineeringHohai UniversityNo.200.Jinling North RoadXinbeiChangzhou213022China School of Mechanical Engineering Changzhou UniversityNo.1.Gehu RoadWujinChangzhou213164China School of Mathematics&Physics Changzhou UniversityNo.1.Gehu RoadWujinChangzhou213164China National Research Center for Rehabilitation Technical Aids Beijing Key Laboratory of Rehabilitation Technical Aids for Old-Age DisabilityKey Laboratory of Rehabilitation Technical Aids Technology and System of the Ministry of Civil AffairsNo.1.Ronghuazhong RoadBeijing BDABeijing100176China.

OSAHS(Obstructive Sleep Apnea Hypopnea Syndrome)is a respiratory disease mainly characterized by limited and repeated pauses of breathing in ***,the optimal treatment is to apply CPAP(Continuous Positive Airway Pressure)ventilation on the upper airway of the patient through a household respiratory ***,if the ventilator mask is designed improperly,it might cause the residue and repeated inhalation of CO2,which will exert an adverse impact on the therapeutic *** research numerically analyzed the CO2 transportation inside a commercial ventilator mask(Mirage SoftGel,ResMed,Australia)based on the reconstructed 3D numerical model of a volunteer's face and performed the improved design of the ventilator mask in terms of the CO2 residual concentration below the *** fluid dynamic analyses showed that at the end time of expiratory,the CO2 residual concentration below the nostrils is close to 4%.To improve the therapeutic effect,we changed the position of the exhaust holes and found that by moving the exhaust holes to the bottom of the ventilator mask,the CO2 residual concentration below the nostrils would be reduced to no more than 1%.This study established a near physiological computational model and provided a new method for the individualized design of the commercial ventilator mask.

关键词： Obstructive sleep apnea hypopnea syndrome continuous positive airway pressure ventilator mask CO2 residual concentration 3D numerical reconstruction.

Accuracy of pedicle screw placement in the thoracic and lumbosacral spines using O-arm-based navigation versus conventional freehand technique

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Chinese Neurosurgical Journal 2019年第3期5卷 137-143页

作者： Linkai Jing zhenze wang Zhenxing Sun Huifang Zhang James wang Guihuai wang School of Clinical Medicine Tsinghua UniversityBeijing 100084China Department of Neurosurgery Beijing Tsinghua Changgung HospitalSchool of Clinical MedicineTsinghua UniversityBeijing 102218China

The accuracy and safety of pedicle screw insertion was markedly improved with the introduction of intraoperative three-dimensional navigation system during the last decade. This study aimed to evaluate the accuracy of pedicle screw placement using O-arm-based navigation system versus conventional freehand technique. Methods: We reviewed the accuracy of 341 thoracic (n = 173) and lumbosacral (n = 168) pedicle screws placed in 60 consecutive patients using either O-arm-based navigation or freehand technique in the Department of Neurosurgery of Beijing Tsinghua Changgung Hospital between January 2015 and June 2018. Patient-specific characteristics, treatment-related characteristics, and screw-specific accuracy were analyzed. The accuracy of pedicle screw placement was measured by Gertzbein-Robbins scale and screw grades A and B were clinically acceptable. Results: One hundred ninety-one screws were inserted in the O-arm-based navigation group and 150 in the freehand group. One hundred eighty-three (95.81%) clinically acceptable screws were placed in the navigation group and 135 (90.00%) in the freehand group (p = 0.034). Twenty-three (6.74%) screw revisions were performed in the two groups (8 screws in the navigation group and 15 screws in the freehand group) and significant difference was observed in thoracic spine (p = 0.018), while no statistical significance was presented in lumbosacral spine (p >0.05). Twenty-four (12.57%) screws in the navigation group and 24 (16.00%) in the freehand group violated the cortex (p > 0.05). Medial screw deviation was the most common problem in the two groups. Conclusion: The O-arm-based navigation exhibits higher accuracy for pedicle screw insertion than the freehand insertion technique.

关键词： Accuracy Freehand Navigation O-arm Pedicle screw

Game Theory based Optimal Defensive Resources Allocation with Incomplete Information in Cyber-physical Power Systems against False Data Injection Attacks

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Protection and Control of Modern Power Systems 2024年第2期9卷 115-127页

作者： Bingjing Yan zhenze Jiang Pengchao Yao Qiang Yang Wei Li Albert Y.Zomaya College of Electrical Engineering Zhejiang University College of Control Science and Engineering Zhejiang University College of Electrical Engineering Zhejiang UniversityHangzhou 310027China School of Information Technologies at The University of Sydney School of Information Technologies

Modern power grid is fast emerging as a complex cyber-physical power system(CPPS)integrating physical current-carrying components and processes with cyber-embedded computing,which faces increasing cy-berspace security threats and *** this paper,the state(i.e.,voltage)offsets resulting from false data injection(FDI)attacks and the bus safety characterization are applied to quantify the attack *** state offsets are obtained by the state estimation method,and the bus safety characterization considers the power net-work topology as well as the vulnerability and connection relationship of *** the indeterminacy of attacker’s resource consumption and reward,a zero-sum game-theoretical model from the defender’s perspective with incomplete information is explored for the optimal allocation of limited defensive *** attacker aims to falsify measurements without triggering threshold alarms to break through the protection,leading to load shedding,over-voltage or *** defender attempts to ensure the estimation results to be as close to the actual states as possible,and guarantee the system’s safety and efficient defensive resource *** proposed solution is extensively evaluated through simu-lations using the IEEE 33-bus test network and real-time digital simulator(RTDS)based testbed experiments of the IEEE 14-bus *** results demonstrate the effec-tiveness of the proposed game-theoretical approach for optimal defensive resource allocation in CPPS when lim-ited resources are available when under FDI *** Terms—Optimal strategy,game theory,Nash equilibrium,CPPS,FDI attack.

关键词： Optimal strategy game theory Nash equilibrium CPPS FDI attack

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中国现行农业建设项目管理存在问题及对策

农业工程学报 2008年第10期24卷 296-300页

作者：宋薇王振泽农业部工程建设服务中心北京100081

该文通过对中国目前农业建设项目管理的实际状况进行研究总结,从中国农业建设项目的项目管理主体、以及各管理主体间的关系、项目管理制度三个角度分析了项目管理的现状。总结出了项目管理中存在的主要问题,包括目前项目管理中约束机制... 详细信息

该文通过对中国目前农业建设项目管理的实际状况进行研究总结,从中国农业建设项目的项目管理主体、以及各管理主体间的关系、项目管理制度三个角度分析了项目管理的现状。总结出了项目管理中存在的主要问题,包括目前项目管理中约束机制不健全、管理体系不完善、监管力量不足等管理体系问题;由投资方式、管理形式、专业化程度、管理经费等引起的管理方式问题;以及存在于项目实施过程中的问题。相应地提出了完善制度体系、加强管理力量、创新体制机制等有效措施,为农业建设与投资管理提供政策建议和管理参考。

关键词：农业工程建设项目管理投资

纯水相Ag^(+)/TiO_(2)溶液的制备及其抗菌性能研究

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功能材料 2024年第4期55卷 4167-4173页

作者：吴世斌谢镇泽王景光杜昶华南理工大学材料科学与工程学院广州510006

采用低温液相法制备了纯水相纳米TiO_(2)溶液,然后在纳米TiO_(2)表面沉积Ag^(+)获得了纯水相Ag^(+)/TiO_(2)溶液。通过扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱仪(FT-IR... 详细信息

采用低温液相法制备了纯水相纳米TiO_(2)溶液,然后在纳米TiO_(2)表面沉积Ag^(+)获得了纯水相Ag^(+)/TiO_(2)溶液。通过扫描电子显微镜(SEM)、X射线能谱仪(EDS)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)、傅里叶变换红外光谱仪(FT-IR)、紫外-可见光吸收光谱仪(UV-Vis)和荧光光谱仪(PL)进行表征。经过各项表征分析可知,Ag^(+)/TiO_(2)粒子是粒径10 nm的球形颗粒,XRD特征峰为锐钛矿二氧化钛和硫酸银的叠加峰。此外,沉积的Ag以+1的价态存在,且提高了纳米TiO_(2)的光催化活性,产生了协同效应。抗菌测试结果表明,制备的纯水相Ag^(+)/TiO_(2)溶液在不同菌种和不同应用环境下均表现优异的抗菌性能,说明了Ag^(+)/TiO_(2)抗菌的高效性和广谱性,具有极大的市场应用价值。

关键词： Ag^(+)/TiO_(2)溶液低温液相表面沉积纯水相抗菌

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多维度提升开放教育思想政治理论课育人质量

山西开放大学学报 2024年第1期29卷 21-25页

作者：王卓娅秦振泽山西开放大学山西太原030027

新时代讲好思想政治理论课应把提高铸魂育人质量作为出发点和落脚点。提升开放教育思想政治理论课育人质量,要从师资队伍、教学团队、教学资源、实践教学、集体备课、教学研究等维度齐发力,不断增强思想政治理论课的亲和力、感染力,提... 详细信息

新时代讲好思想政治理论课应把提高铸魂育人质量作为出发点和落脚点。提升开放教育思想政治理论课育人质量,要从师资队伍、教学团队、教学资源、实践教学、集体备课、教学研究等维度齐发力,不断增强思想政治理论课的亲和力、感染力,提升其理论性和实践性,全面提高思想政治理论课教育教学质量。

关键词：互联网思想政治理论课开放教育六位一体

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氦气竞争性溶解现象的实验探究与设计

石油化工应用 2018年第9期37卷 99-102页

作者：王振泽西北大学地质学系/大陆动力学国家重点实验室陕西西安710069

在对氦气资源成藏问题的研究中,有学者发现,游离相氦气藏的成藏与储层中其他气体(CH4,CO2,N2等)有着密切的关系,多种气体同时溶解时所产生的竞争性会降低氦气在水中的溶解度,将水溶液中的氦气置换出来成为游离相。但是目前这种现象只是... 详细信息

在对氦气资源成藏问题的研究中,有学者发现,游离相氦气藏的成藏与储层中其他气体(CH4,CO2,N2等)有着密切的关系,多种气体同时溶解时所产生的竞争性会降低氦气在水中的溶解度,将水溶液中的氦气置换出来成为游离相。但是目前这种现象只是理论上的推测,缺乏实验数据的支撑,同时,目前对于气体溶解度的测定实验,大多是测定某一种气体在不同温度、压力下的溶解度,而没有测定多种气体溶解时相互影响的装置。本文针对以上问题,以探究氦气与其他气体间的竞争性溶解现象为目的,设计相关实验。

关键词：氦气溶解竞争性实验