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Ca含量对时效态Mg-6.5Al-xCa-1Sn-0.3Sr镁合金显微组织和性能的影响

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铸造 2024年第4期73卷 503-508页

作者：热焱邱克强辽宁省交通高等专科学校辽宁沈阳110122 沈阳工业大学材料科学与工程学院辽宁沈阳110870

通过XRD、SEM和性能测试研究了Ca含量的变化对时效态Mg-6.5Al-xCa-1Sn-0.3Sr(x=1,1.5,2,2.5)镁合金的显微组织和性能的影响。结果表明,时效态合金主要由α-Mg和Al_(2)Ca相组成,Al_(2)Ca相成网状分布。合金的抗拉强度和伸长率随着Ca加入... 详细信息

通过XRD、SEM和性能测试研究了Ca含量的变化对时效态Mg-6.5Al-xCa-1Sn-0.3Sr(x=1,1.5,2,2.5)镁合金的显微组织和性能的影响。结果表明,时效态合金主要由α-Mg和Al_(2)Ca相组成,Al_(2)Ca相成网状分布。合金的抗拉强度和伸长率随着Ca加入量的增加而逐渐降低,当Ca含量为1%时合金的拉伸性能最佳,而合金的硬度随着Ca的加入而增加。在175℃、70 MPa下,Ca的添加使时效态合金的稳态蠕变速率降低。

关键词： Mg-Al-Ca-Sn-Sr镁合金显微组织力学性能蠕变性能

Total body water percentage and 3rd space water are novel risk factors for training-related lower extremity muscle injuries in young males

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Chinese Journal of Traumatology 2024年第3期27卷 168-172页

作者： Liang Chen ke-Xing Jin Jing yang Jun-Jjie Ouyang Han-Gang Chen Si-Ru Zhou Xiao-Qing Luo Mi Liu Liang Kuang yang-Li Xie yan Hu Lin Chen Zhen-Hong Ni Xiao-Lan Du Department of Orthopedic Daping HospitalArmy Medical UniversityChongqing400042China Department of Rehabilitation Medicine Daping HospitalArmy Medical UniversityChongqing400042China Department of Wound Repair and Rehabilitation Medicine Center of Bone Metabolism and RepairLaboratory for Prevention and Rehabilitation of Training InjuriesState Key Laboratory of Trauma and Chemical Poisoning.Trauma CenterResearch Instiute of SurgeryDaping HospitalArmy Medical UniversityChongqing.400042China War Trauma Medical Center Daping HospitalArmy Medical UniversityChongqing400042.China Department of Military Basic Training and Army Management Army Health Service Training BaseArmy Medical UniversityChongqing400042China Department of Army Occupational Disease Laboratory for Prevention and Rehabilitation of Training InjuriesState Key Laboratory of Trauma and Chemical PoisoningResearch Institute of SurgeryDaping HospitalArmy Medical UniversityChongqing400042.China

Purpose:To identify the risk factors for training-related lower extremity muscle injuries in young males by a non-invasive method of body composition ***:A total of 282 healthy young male volunteers aged 18-20 years participated in this cohort *** location,degree,and injury rate were adjusted by a questionnaire based on the overuse injury assessment methods used in epidemiological studies of sports *** occurrence of training injuries is monitored and diagnosed by physicians and treated *** body composition was measured using the BodyStat QuadScan 4000 multifrequency Bio-impedance system at 5,50,100 and 200 kHz to obtain 4 impedance *** Shapiro-Wilk test was used to check whether the data conformed to a normal *** of normal distribution were shown as mean±SD and analyzed by t-test,while those of non-normal distribution were shown as median(Q1,Q3)and analyzed by Wilcoxon rank sum *** receiver operator characteristic curve and logistic regression analysis were performed to investigate risk factors for developing training-related lower extremity injuries and ***:Among the 282 subjects,78(27.7%)developed training *** extremity training injuries revealed the highest incidence,accounting for 23.4%(66 cases).These patients showed higher percentages of lean body mass(p=0.001),total body water(TBW,p=0.006),extracellular water(p=0.020)and intracellular water(p=0.010)as well as a larger ratio of basal metabolic rate/total weight(p=0.006),compared with those without lower extremity muscle *** the contrary,the percentage of body fat(p=0.001)and body fat mass index(p=0.002)were *** regression analysis showed that TBW percentage>65.35%(p=0.050,odds ratio=3.114)and 3rd space water>0.95%(p=0.045,odds ratio=2.342)were independent risk factors for lower extremity muscle ***:TBW percentage and 3rd space water measured with bio-impedance method are potential ris

关键词： Body composition Training injuries Lower extremity Bio-impedance

Effect of substrate temperature and oxygen plasma treatment on the properties of magnetron-sputtered CdS for solar cell applications

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中国科学技术大学学报 2024年第6期54卷 22-33,I0010页

作者： Runxuan Zang Haolin Wang Xiaoqi Peng ke Li Yuehao Gu Yizhe Dong Zhihao yan Zhiyuan Cai Huihui Gao Shuwei Sheng Rongfeng tang Tao Chen Department of Materials Science and Engineering School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Cadmium sulfide(CdS)is an n-type semiconductor with excellent electrical conductivity that is widely used as an electron transport material(ETM)in solar *** present,numerous methods for preparing CdS thin films have emerged,among which magnetron sputtering(MS)is one of the most commonly used vacuum *** this type of technique,the substrate temperature is one of the key deposition parameters that affects the interfacial properties between the target film and substrate,determining the specific growth habits of the ***,the effect of substrate temperature on the microstructure and electrical properties of magnetron-sputtered CdS(MS-CdS)films was studied and applied for the first time in hydrothermally deposited antimony selenosulfide(Sb_(2)(S,Se)_(3))solar *** the substrate temperature not only results in the design of the flat and dense film with enhanced crystallinity but also leads to the formation of an energy level arrangement with a Sb_(2)(S,Se)_(3)layer that is more favorable for electron *** addition,we developed an oxygen plasma treatment for CdS,reducing the parasitic absorption of the device and resulting in an increase in the short-circuit current density of the solar *** study demonstrates the feasibility of MS-CdS in the fabrication of hydrothermal Sb_(2)(S,Se)_(3)solar cells and provides interface optimization strategies to improve device performance.

关键词： magnetron sputtering CdS substrate heating plasma treatment Sb_(2)(S,Se)_(3) thin film solar cell

Fluoride Conversion Coating on Biodegradable AZ31B Magnesium Alloy

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Journal of Materials Science & Technology 2014年第7期30卷 666-674页

作者： Tingting yan Lili tan Bingchun Zhang ke yang Faculty of Materials Science and Engineering Kunming University of Science and Technology Institute of Metal Research Chinese Academic of Sciences

A fluoride conversion coating was successfully prepared on AZ31B magnesium alloy by chemical reaction in hydrofluoric acid. Morphologies, composition, bonding strength, corrosion properties, in vitro cytotoxicity and antibacterial properties of the coating were investigated, respectively. The scanning electron microscopy observations revealed a dense coating with some irregular pores. The thin-film X-ray diffraction analysis indicated that the coating was mainly composed of MgO and MgF2. The electrochemical impedance spectroscopy results showed that the fluoride conversion coating significantly improved the corrosion resistance of AZ31B. The hydroxyapatite formed on the surface of the fluoride coated AZ31 B after being immersed in the simulated blood plasma indicated the good bioactivity of the material. The in vitro cytotoxicity test showed that the fluoride coated AZ31B alloy was not toxic to BMMSCs （human bone marrow-derived mesenchymal stem cells）. It was also found that the fluoride coated AZ31 B alloy had antibacterial capability.

关键词： AZ31B magnesium Fluoride coating Corrosion resistance Cytotoxicity Antibacterial

农村留守老人生活质量评价指标体系构建及其政策启示

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人口与社会 2024年第1期40卷 67-81页

作者：柯燕武汉科技大学法学与经济学院湖北武汉430065

利用我国东中西部三省1 016份微观调查数据,运用结构方程模型构建了包括7个维度29个指标的农村留守老人生活质量评价指标体系。检验结果显示,理论预设的生活质量评价指标体系具有良好的信度和效度。物质生活、健康状况和社会参与是农村... 详细信息

利用我国东中西部三省1 016份微观调查数据,运用结构方程模型构建了包括7个维度29个指标的农村留守老人生活质量评价指标体系。检验结果显示,理论预设的生活质量评价指标体系具有良好的信度和效度。物质生活、健康状况和社会参与是农村留守老年人生活质量最重要的影响因素。为提高农村留守老人生活质量,应推动乡村产业振兴和共同富裕,健全老年人健康支持体系,促进农村留守老人的社会参与。

关键词：农村留守老人生活质量积极老龄化评价指标体系乡村振兴

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考虑竞争的OEM生产采购外包战略决策

管理科学学报 2024年第1期27卷 28-45页

作者：王甜源傅科徐佳焱仲恺农业工程学院管理学院广州510225 中山大学管理学院广州510275

生产外包和采购外包是制造商面临的重要战略决策.对此问题,建立一个博弈论模型,研究在竞争情形下制造商关于生产和采购的双重外包战略决策.在决定是否外包生产的同时,制造商还决定是否把零部件的采购外包给竞争对手.研究结果表明,制造... 详细信息

生产外包和采购外包是制造商面临的重要战略决策.对此问题,建立一个博弈论模型,研究在竞争情形下制造商关于生产和采购的双重外包战略决策.在决定是否外包生产的同时,制造商还决定是否把零部件的采购外包给竞争对手.研究结果表明,制造商的最优生产和采购外包战略会受到自身和竞争对手的相对市场潜力以及生产投资成本的影响.制造商的最优外包战略可能为生产和采购都外包、生产和采购都自主进行以及生产外包但采购不外包.同时,对于制造商来说,任何情形下都不应单独把采购外包;而市场潜力较弱的竞争对手则希望制造商生产外包但采购不外包.另外,研究表明在一定条件下存在双赢策略,使得制造商和竞争对手都达到最优利润:当竞争对手和制造商的市场潜力差距较大时,制造商外包生产但自主采购能实现双赢;当它们的市场潜力差距较小时,制造商将生产和采购都外包能实现双赢.

关键词：生产外包采购外包竞争纳什均衡

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氢燃料电池高性能催化剂研究进展

中国资源综合利用 2024年第4期42卷 129-133,137页

作者：闫珂江苏北矿金属循环利用科技有限公司江苏徐州221121

氢燃料电池是高效、清洁的能源利用转化装置,目前,氢燃料电池使用的催化剂多是碳载铂催化剂或碳载铂基合金催化剂。这类催化剂的价格较高,在使用过程中,催化氧还原反应的活性逐渐衰减,因此必须寻找活性更高、稳定性更强的低铂催化剂。... 详细信息

氢燃料电池是高效、清洁的能源利用转化装置,目前,氢燃料电池使用的催化剂多是碳载铂催化剂或碳载铂基合金催化剂。这类催化剂的价格较高,在使用过程中,催化氧还原反应的活性逐渐衰减,因此必须寻找活性更高、稳定性更强的低铂催化剂。本文结合氢燃料电池中常见的氧还原反应催化剂,综述铂基催化剂制备方法的研究进展,指出铂基催化剂实现低成本与高性能的重点技术问题,以期为研发与制备氢燃料电池的高性能低成本催化剂提供新思路。

关键词：氢燃料电池高性能催化剂低成本氧还原反应

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数据要素视角下数字税收制度的设计与衔接

税务研究 2024年第8期 61-65页

作者：白彦徐可刘浩明北京大学政府管理学院中国政法大学民商经济法学院广西师范大学政治与公共管理学院

以调节横向分配为目标的数字税收制度与我国国内数字经济税法调控的目标并不匹配。数据资源入表的制度突破为数字税收制度设计提供了新的切入点。应在实现征税对象客体化和货币化的基础上,考察在现有间接税和直接税框架内纳入数字税收... 详细信息

以调节横向分配为目标的数字税收制度与我国国内数字经济税法调控的目标并不匹配。数据资源入表的制度突破为数字税收制度设计提供了新的切入点。应在实现征税对象客体化和货币化的基础上,考察在现有间接税和直接税框架内纳入数字税收制度的可能形式,针对性调整应税项目并拓展数据的无形资产属性,基于要素分配原理实现数字经济税收的公平负担。

关键词：数据要素数字经济数字服务税量能课税

Research on the development methodology for clinical practice guidelines for organic integration of traditional Chinese medicine and Western medicine

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Military Medical Research 2024年第3期11卷 313-322页

作者： Ying-Hui Jin yan-Ping Wang Ying-Lan Xie Gui-Hua Tian Xiao-Yu Zhang Nan-Nan Shi ke-Hu yang Xin Sun Yao-Long Chen Da-Rong Wu Xin-Feng Guo Long Ge Chen Zhao Cheng Lu Yin Jiang Jing Guo Si-Yu yan Yong-Bo Wang Qiao Huang Xiang-Ying Ren Ying-Yue Rao Yun-Yun Wang Meng-Qian Yuan Xian-Tao Zeng Hong-Cai Shang Center for Evidence-Based and Translational Medicine Zhongnan Hospital of Wuhan UniversityWuhan 430071China Institute of Basic Research in Clinical Medicine China Academy of Chinese Medical SciencesBeijing 100700China China Center for Evidence Based Traditional Chinese Medicine Beijing 100029China Hubei Provincial Hospital of Traditional Chinese Medicine Wuhan 430074China key Laboratory of Chinese Internal Medicine of Ministry of Education and Beijing Dongzhimen HospitalBeijing University of Chinese MedicineBeijing 100700China Evidence-Based Medicine Center School of Basic Medical SciencesLanzhou UniversityLanzhou 730000China China Center for Evidence-Based Medicine West China Hospital of Sichuan UniversityChengdu 610041China State key Laboratory of Dampness Syndrome of Chinese Medicine the Second Affliated Hospital of Guangzhou University of Chinese MedicineGuangzhou 510120China Evidence-based Medicine Team Guangdong Provincial Hospital of Traditional Chinese MedicineGuangzhou 510120China Nanjing University of Chinese Medicine Nanjing 210023China Jiangsu Province Hospital of Chinese Medicine Nanjing 210029China

Integrated traditional Chinese medicine(TCM)and Western medicine(WM)is a new medical science grounded in the knowledge bases of both TCM and WM,which then forms a unique modern medical system in *** TCM and WM has a long history in China,and has made important achievements in the process of clinical diagnosis and ***,the methodological defects in currently published clinical practice guidelines(CPGs)limit its *** organic integration of TCM and WM is a deeper integration of TCM and *** realize the progression of"integration"to"organic integration",a targeted and standardized guideline development methodology is ***,the purpose of this study is to establish a standardized development procedure for clinical practice guidelines for the organic integration of TCM and WM to promote the systematic integration of TCM and WM research results into clinical practice guidelines in order to achieve optimal results as the whole is greater than the sum of the parts.

关键词： Methodology Traditional Chinese medicine Western medicine Organic integration Clinical practice guidelines(CPGs)