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直升机飞行员身体素质特征探究

中华航海医学与高气压医学杂志 2024年第4期31卷 505-508页

作者：庄薇朱庆春杨淇齐杭州师范大学体育学院杭州空军杭州特勤疗养中心疗养三区杭州

目的调查直升机飞行员的身体素质特征。方法采集2019年1月至2022年6月在杭州某疗养中心接受测试的1 840名男性直升机飞行员的身体素质数据, 包括握力、背肌力、俯卧撑、原地纵跳、全身反应时、闭眼单脚站立、坐位体前屈等7项指标。参与... 详细信息

目的调查直升机飞行员的身体素质特征。方法采集2019年1月至2022年6月在杭州某疗养中心接受测试的1 840名男性直升机飞行员的身体素质数据, 包括握力、背肌力、俯卧撑、原地纵跳、全身反应时、闭眼单脚站立、坐位体前屈等7项指标。参与者根据年龄划分为6个年龄段:20～24岁、25～29岁、30～34岁、35～39岁、40～44岁、45～49岁。对照国家体育总局发布的国民体质监测报告, 对比飞行员群体与普通人群的体质差异性。使用单因素方差检验对6个年龄段飞行员的身体素质指标进行统计学分析, 并采用Bonferroni事后检验不同年龄段之间的差异水平。结果直升机飞行员各年龄段的握力和背肌力比较差异无统计学意义(P>0.05)。随着年龄的增长, 直升机飞行员的俯卧撑数量、原地纵跳高度、闭眼单脚站立时间、坐位体前屈逐渐减少, 全身反应时逐渐延长, 与20～24岁年龄段相比, ≥25岁直升机飞行员的俯卧撑数量明显减少、原地纵跳高度明显降低, ≥40岁直升机飞行员的全身反应时明显延长, ≥30岁直升机飞行员的闭眼单脚站立时间、坐位体前屈明显减少(P<0.05, P<0.01或P<0.001)。各年龄段直升机飞行员的握力、俯卧撑数量、原地纵跳高度、全身反应时、闭眼单脚站立时间、坐位体前屈均值均优于同年龄段普通男性(P<0.05)。结论直升机飞行员具有良好的身体素质, 尤其在反应速度方面明显超过同龄普通男性;直升机飞行员的握力维持较好, 但肌肉爆发力、平衡、柔韧能力衰退开始较早, 建议在日常训练中提前增加相关练习;直升机飞行员反应速度明显优于平均水平, 但40岁后衰退加快, 建议增加反应速度的相关练习。

关键词：直升机飞行员身体素质年龄效应

小剂量复方倍他米松联合富血小板血浆在膝骨关节炎中的应用效果

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中国合理用药探索 2024年第3期21卷 68-74页

作者：任国强明海武董卫兵庄卫生郑州颐和医院骨科郑州450000 河南省人民医院骨科郑州450000

目的:探讨小剂量复方倍他米松联合富血小板血浆(PRP)在膝骨关节炎(KOA)中的应用效果。方法:选取2021年12月~2022年12月期间某院收治的92例KOA患者作为研究对象,采用简单随机抽样法分为对照组和观察组,每组46例。所有患者均给予KOA常规药... 详细信息

目的:探讨小剂量复方倍他米松联合富血小板血浆(PRP)在膝骨关节炎(KOA)中的应用效果。方法:选取2021年12月~2022年12月期间某院收治的92例KOA患者作为研究对象,采用简单随机抽样法分为对照组和观察组,每组46例。所有患者均给予KOA常规药物(硫酸氨基葡萄糖胶囊)治疗,对照组患者给予PRP治疗,观察组在对照组基础上加用小剂量复方倍他米松注射液。比较两组患者疼痛情况[视觉模拟评分法(VAS)]、膝关节功能恢复情况[Lysholm膝关节功能评分表(LKSS)]、膝关节活动度[关节活动度(ROM)、西安大略和麦克马斯特大学骨关节炎指数(WOMAC)]、日常生活能力[Barthel指数(BI)]、步行能力、临床疗效及不良反应发生情况。结果:治疗后,两组患者VAS评分均降低(P<0.05),且观察组低于对照组(P<0.05);LKSS评分均升高(P<0.05),且观察组高于对照组(P<0.05);关节主动活动度、关节被动活动度均升高(P<0.05),且观察组高于对照组(P<0.05);WOMAC评分均降低(P<0.05),且观察组低于对照组(P<0.05);BI、步行能力得分均升高(P<0.05),且观察组均高于对照组(P<0.05)。观察组患者治疗总有效率(95.65%)高于对照组(80.43%,P<0.05)。两组患者不良反应发生情况比较无统计学差异(χ^(2)=0.212,P=0.646)。结论:在KOA常规药物治疗基础上联合PRP、小剂量复方倍他米松治疗KOA患者临床疗效较好,可显著减轻患者疼痛,改善膝关节活动情况,促进膝关节功能恢复,提高日常生活能力和步行能力。

关键词：富血小板血浆复方倍他米松膝骨关节炎膝关节功能日常生活能力步行能力

超高效液相色谱-串联质谱检测蔗糖中47种农药残留量的方法

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药物分析杂志 2024年第6期44卷 979-989页

作者：谭菊英蒋洁刘庄蔚何虹杨欣智朱健萍邓鸣徐光辉王健赵庄卢日刚广西壮族自治区药品检验研究院南宁530021 中粮崇左糖业有限公司/广西壮族自治区甘蔗产业链延伸工程研究中心崇左532200 中粮营养健康研究院有限公司/营养健康与食品安全北京市重点实验室北京102209

目的:建立超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定蔗糖中47种农药残留量的方法。方法:蔗糖样品经酸性乙腈提取,氮气吹干浓缩,采用LC-MS/MS进行分析检测,在多反应检测模式(MRM)下,用空白基质标准曲线-内标法进行定量。结果:各待测... 详细信息

目的:建立超高效液相色谱-串联质谱(UPLC-MS/MS)同时测定蔗糖中47种农药残留量的方法。方法:蔗糖样品经酸性乙腈提取,氮气吹干浓缩,采用LC-MS/MS进行分析检测,在多反应检测模式(MRM)下,用空白基质标准曲线-内标法进行定量。结果:各待测物质在一定浓度范围内线性良好(r>0.995),检测限为0.01~2.00μg·kg^(-1)。分别在蔗糖样品中添加47种农药标准溶液10、25、50μg·kg^(-1),进行标准添加回收试验,方法回收率为71.0%~106.0%,重复性RSD为0.90%~8.5%。15批蔗糖样品中2批检出噻虫嗪、噻虫胺,其余均未检出。结论:该方法具有前处理简单快捷、灵敏、准确等优点,符合农药残留检测要求,满足蔗糖中农药残留检测需要,可用于蔗糖的质量控制。

关键词：蔗糖农药残留液相色谱-质谱多反应监测模式基质效应内标法

TEST AND STUDY ON THE CONSTITUTIV ERELATIONSHIP OF DESERT SAND UNDER MOVING VEHICLE

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Chinese Journal of Mechanical Engineering 1999年第1期12卷 71-76页

作者： Li Jie zhuang Jide wei Dong Jilin University of Technology Jilin Univ of Technology Changchun China

The mechanical properties of the sand of Takelamagan desert in Xinjiang under moving vehicle are studied by soil dynamic triaxial test apparatus. The nonlinear elastic constitutive model of the sand under moving vehicle is established first. These results lay the foundations for studying the interaction between vehicle running gear and the sand of Takelamagan desert in Xinjiang. and developing sand vehicle.

关键词： Vehicle Takelamagan desert Sand Constitutive relationship Nonlinear elastic constitutive model

Determination of mechanical properties of pure zirconium processed by surface severe plastic deformation through nanoindentation

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Rare Metals 2019年第9期38卷 824-831页

作者： Yao-Mian Wang wei zhuang Huan-Ping Yang Cong-Hui Zhang School of Metallurgical Engineering Xi’an University of Architecture and Technology

Commercially pure zirconium was processed by the surface mechanical attrition treatment(SMAT),and the microstructure observation showed that a gradient structure was *** measurements were taken to obtain the load-displacement curves at different depths below the treated *** dimensional analysis,the local yield stress,hardness,strain hardening exponent,and elastic modulus at the corresponding depths were *** results showed that the yield stress and hardness varied with depth,while the strain hardening exponent and elastic modulus were approximately *** finite element method was used to simulate nanoindentation at different depths below the treated surface to verify the derivation of the local elastic-plastic constitutive *** curves were computed for the treated samples through the rule of mixtures,and they agreed well with the experimental *** analysis showed that the surface and subsurface hardening layers as well as the transition layer shared a high load applied to the samples,even though their volume fraction was small.

关键词： Mechanical property Severe plastic deformation Gradient microstructure Nanoindentation Finite element method

Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures

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Acta Oceanologica Sinica 2020年第11期39卷 21-32页

作者： Zhehao Zheng wei zhuang Jianyu Hu Zelun Wu Changjian Liu State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Joint Center for Ocean Remote Sensing University of Delaware-Xiamen UniversityNewarkDE 19716USA South China Sea Marine Survey and Technology Center Ministry of Natural ResourcesGuangzhou 510300China

This study presents a Lagrangian view of upper water exchanges across the Luzon Strait based on the finite-time Lyapunov exponents(FTLE)fields computed from the surface geostrophic *** Lagrangian coherent structures(LCSs)extracted from the FTLE fields well identify the typical flow patterns and eddy activities around the Luzon *** addition,they reveal the intricate transport paths and fluid domains,which are validated by the tracks of satellite-tracked surface drifters and cannot be visually recognized in the velocity *** FTLE fields indicate that there are mainly four types of transport patterns near the Luzon Strait;among them,the Kuroshio northward-flowing"leaping"pattern and the clockwise rotating"looping"pattern occur more frequently than the"leaking"pattern of the direct Kuroshio branch into the SCS and the"outflowing"pattern from the SCS to the *** eddy shedding events of the Kuroshio at the Luzon Strait are further analyzed,and the importance of considering LCSs in estimating transport by eddies is *** anticyclonic eddy(ACE)shedding cases reveal that ACEs mainly originate from the looping paths of Kuroshio and thus could effectively trap the Kuroshio water before eddy *** provide useful information to predict the positions of the upstream waters that finally enter the *** contrast,LCS snapshots indicate that during the formation of cyclonic eddies(CEs),most CEs are not connected with the pathways of Kuroshio ***,the contribution of CEs to the surface water exchanges from the Pacific into the SCS is tiny.

关键词： Lagrangian coherent structures(LCSs) Kuroshio Luzon Strait transport pathways particle tracking

Enhanced production of cytidine 5'-monophosphate using biocatalysis of di-enzymes immobilized on amino-functionalized sepharose

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Chinese Journal of Chemical Engineering 2023年第6期58卷 40-52页

作者： Xiaohong Zhou Wenfeng Zhou wei zhuang Chenjie Zhu Hanjie Ying Hongman Zhang School of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Materials-Oriented Chemical Engineering College of Biotechnology and Pharmaceutical EngineeringNational Engineering Technique Research Center for BiotechnologyNanjing Tech UniversityNanjing 211816China

Cytidine 5'-monophosphate(5'-CMP)is an essential nucleotide for *** this study,enhanced production of 5'-CMP was realized by the transformation of cytidine using co-immobilized di-enzymes,uridine-cytidine kinase(UCK)and acetate kinase(AcK).The immobilization yield of the enzyme had a clear correlation with the surface charges as zeta potential(ξ).Among them,ε-polylysinefunctionalized sepharose(SA-EPL,ξ=9.31 m V)showed high immobilization yield(78.8%),which was4.9-fold than that of nitrilotriacetic acid functionalized sepharose(SA-NTA,ξ=-12.6 m V).The residual activity of affinity co-immobilized enzyme(EPL-Ni/EPL@Ac K-UCK)was higher than 70.6%after recycled 10 ***,this study provides an effective approach for the production of 5'-CMP with the advantages of low adenosine 5'-triphosphate(ATP)consumption,reduced side reactions,and improved reusability by co-immobilized UCK and Ac K on the functionalized Sepharose.

关键词： Sepharose ε-Polylysine Dual-enzyme cascade Cytidine 5'-monophosphate Enzyme immobilization

Recent advance of chemoenzymatic catalysis for the synthesis of chemicals: Scope and challenge

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Chinese Journal of Chemical Engineering 2021年第2期34卷 146-167页

作者： Mengjiao Xu Zhuotao Tan Chenjie Zhu wei zhuang Hanjie Ying Pingkai Ouyang College of Biotechnology and Pharmaceutical Engineering Nanjing Tech UniversityNanjing 211816China

Chemoenzymatic catalysis can give full play to the advantages of versatile reactivity of chemocatalysis and excellent chemo-,regio-,and stereoselectivities of *** chemoenzymatic methods can not only save resource,cost,and operating time but also reduce the number of reaction steps,and avoid separating unstable intermediates,leading to the generation of more products under greener circumstances and thereby playing an indispensable role in the fields of medicine,materials and fine *** incompatible challenges between chemocatalyst and biocatalyst remain,strategies such as biphasic system,artificial metalloenzymes,immobilization or supramolecular host,and protein engineering have been designed to overcome these *** this review,chemoenzymatic catalysis according to different chemocatalysis types was classifiably described,and in particular,the classic dynamic kinetic resolutions(DKR)and cofactor regeneration were ***,the bottlenecks and development of chemoenzymatic catalysis were summarized,and future development was prospected.

关键词： Chemoenzymatic Dynamic kinetic resolution Cofactor regeneration Biocatalysis Chemocatalysis

A Research on the Flow Characteristics of a Splitter-Based Water Cooling System for Computer Boards

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Fluid Dynamics & Materials Processing 2021年第4期17卷 833-844页

作者： Yukun Lv Quanzhi Ge zhuang wei Shuang Yang North China Electric Power University Baoding071003China

The splitter is an important component of water-based cooling systems used to extract heat from computer *** the present study,the flow characteristics of a 16-splitter structure were numerically simulated and compared with experimental results to verify the reliability of the numerical simulation ***,the concept of splitter structural coefficients was *** on the results of this study,we recommend a selection range of 5≤k≤6 for the structure factor k of the splitter;after optimization,the maximum deviation of the splitter outlet flow was reduced from the original value of 100%to 8.3%.

关键词： Computing board cold-water splitter structure factor flow-transfer characteristics experimental study numerical simulation