Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc. submitted time 2023-08-28 Cooperative journals: 《中国全科医学》
Abstract： Background With the rapid progression of aging in China，the challenge of multimorbidity has become a significant concern for both public health and clinical practice. Nocturnal sleep status，including sleep duration and quality，is crucial for regulating body metabolism and physiological functions in the elderly. However，current research on the relationship between nocturnal sleep status and multimorbidity was limited to specific regions or the middle-aged population. The association between nocturnal sleep status and prevalence of multimorbidity among community-dwelling older adults remains ambiguous. Objective To investigate the association between nocturnal sleep status and prevalence of multimorbidity among community#2;dwelling older adults. Methods In April 2023，a total of 11 917 community-dwelling older adults from the Chinese Longitudinal Healthy Longevity and Happy Family Study（CLHLS-HF，wave 2018）were selected as the participants. Multivariate Logistic regression was used to explore the association of sleep duration and sleep quality with the prevalence of multimorbidity， represented by odds ratios（OR）and 95% confidence intervals（95%CI）. Additionally，restrictive cubic splines（RCS） based on Logistic regression analysis were utilized to analyze the dose-response relationship between sleep duration and prevalence of multimorbidity. Results Of the 11 917 community-dwelling older adults，with an average age of 84.4±11.4 years ranged from 65.0 to 117.0 years，6 477 were females（54.35%）and 5 440 were males（45.65%）. Multivariate Logistic regression results after adjusting for covariates such as gender，age，region，and years of education，indicated that compared to those with 6-8 h of nocturnal sleep duration，older adults with shorter sleep duration（<6 h）had a higher prevalence of multimorbidity（OR=1.51， 95%CI=1.36~1.67）；compared to those with good sleep quality，individuals with fair sleep quality（OR=1.34，95%CI=1.22- 1.46）and poor sleep quality（OR=2.14，95%CI=1.91~2.40）were associated with higher prevalence of multimorbidity. RCS plots revealed a“U”-shaped nonlinear association between sleep duration and prevalence of multimorbidity，with an optimal sleep duration of approximately 7 hours. Conclusion Community-dwelling older adults with sleep durations less than 6 hours，fair or poor sleep quality，are associated with an increased prevalence of multimorbidity. The optimal sleep duration for community-dwelling older adults is approximately 7 hours. Normal sleep duration and good sleep quality are important for the prevention of multimorbidity.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： The effect of alloyed Cr on the corrosion behavior of a corrosion-resistant rebar 5Cr steel in simulated concrete pore solutions (saturated Ca(OH)2 solution) with various Cl- contents was investigated. The results showed that the corrosion resistance of 5Cr steel is much better than HRB400 steel, and which may be attributed to the following reasons: the addition of 5%Cr enabled the microstructure of the steel to be refined as bainites dispersed uniformly on ferrites; the passive film formed on 5Cr steel to be modified to exhibita nobler pitting potential in simulated concrete pore solution and to possess a higher content of α-FeOOH in the rust scales, which all lead to the corrosion resistance of 5Cr steel superior to HRB400 steel.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： Corrosion behavior of the Cr modified HRB400 carbon steel rebar in 2%NaCl solution was investigated by means of dry/wet cyclic corrosion test, potentiodynamic polarization and electrochemical impedance spectroscopy. Results show that the open circuit potential moved to higher value in positive direction; the corrosion current density decreased; the polarization resistance increased and the corrosion rate declined for the Cr modified steel in comparison to HRB400 steel. After dry/wet cyclic corrosion test for 72 h, the HRB400 steel exhibited an uniform corrosion morphology, however the Cr modified steel rebar exhibited features of local corrosion. Anyhow, the addition of Cr can significantly reduce the uniform corrosion rate of HRB400 steel rebar.
Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract： The short-term corrosion behavior of X70 steel and Q235 steel buried for 1 a in soil of a select site at Singapore were investigated in terms of characterizing the corrosion products by means of scanning electron microscopy and X-ray diffraction, as well as the physical and chemical parameters of the soil, and measuring the corrosion mass lass. It was found that the soil at the select site was an acidic soil; where the average corrosion rate of Q235 steel was higher than that of X70 steel; the two steels all suffered form local corrosion, while that of Q235 steel was more serious; the corrosion products of these two steels were similar and mainly composed of Fe2O3, Fe3O4, FeOOH and FeOCl, the surface of products were rough and there were some cracks in the products scale, which seemed harmful to its protectiveness.
Subjects: Management Science >> Enterprise Management submitted time 2022-11-26
Abstract：
The digital divide focuses on the acquisition, use and results of digital media. It is an interdisciplinary research involving communication, sociology, psychology, economics, education and other disciplines. Under the influence of the COVID-19, the discussion on the digital divide has once again set off an upsurge. The digital divide has become one of the problems that need to be solved urgently worldwide. Firstly, the paper systematically reviews and combs the evolution process and research progress of the concept of digital divide from the three levels of access, use and benefit of the Internet; secondly, it focuses on the impact of the COVID-19 epidemic on the digital divide and its specific manifestations in urban and rural differences, online education, online medical care, etc; Finally, combined with the dynamic evolution characteristics of the digital divide, this paper analyzes the new dimensions of digital inequality in the era of big data from three perspectives: algorithm knowledge, digital labor and digital exploitation, and personal information protection. Through the research, it points out the future development direction and research focus of digital inequality research in theory, which has a certain role in promoting the theoretical exploration in the field of digital divide, and provides ideas and reference for solving practical problems in the digital divide.
Peer Review Status:
Awaiting Review
Subjects: Biology >> Zoology submitted time 2018-12-24 Cooperative journals: 《动物营养学报》
Abstract：原花青素是植物中广泛存在的一大类多酚化合物的总称，具有超强的抗氧化能力，是目前国际上公认的清除机体自由基最有效的天然抗氧化剂。已有的体内外试验表明，原花青素在改善机体功能方面具有广阔的应用前景，如能够减少炎症、改善氧化应激、抗癌和调节免疫等。本文就原花青素的化学结构、原料来源、分离提取方法、生物学功能，及其在畜禽生产中的应用现状等进行综述。
Subjects: Civil Engineering and Building Construction >> Basic Disciplines of Civil Engineering and Building Construction submitted time 2018-10-26 Cooperative journals: 《土木建筑工程信息技术》
Abstract：大型场馆类项目往往具有造型复杂、结构复杂、专业众多的特点。实际施工中也面临着施工组织难、工序穿插多、施工难度大的情况，应用BIM技术能较好地解决类似的问题[引用已删除]。本文主要介绍了郑州博物馆新馆项目在设计、施工两个阶段如何应用BIM技术解决上述问题，实现了高标准设计、高质量建设、高水平管理。通过此次综合应用，项目建立了由业主驱动，全过程、多参与方协同的BIM实施体系，形成了设计BIM向施工BIM过渡的方法经验，总结了BIM与施工生产业务流程相融合的管理模式。针对设计阶段复杂钢结构的空间定位、曲面幕墙的“深化+加工+施工”技术、基于BIM的“进度+资源+工作”计划管理提出了新的管理思路。本项目结合实际对BIM技术在大型场馆的应用进行探索，通过BIM技术在各个专业的应用，总结BIM技术对促进项目实施的帮助，为以后BIM技术在大型场馆工程应用提供了可参考性资料和有力的支撑。
Subjects: Civil Engineering and Building Construction >> Basic Disciplines of Civil Engineering and Building Construction submitted time 2018-10-26 Cooperative journals: 《土木建筑工程信息技术》
Abstract：大型场馆类项目往往具有造型复杂、结构复杂、专业众多的特点。实际施工中也面临着施工组织难、工序穿插多、施工难度大的情况，应用BIM技术能较好地解决类似的问题[引用已删除]。本文主要介绍了郑州博物馆新馆项目在设计、施工两个阶段如何应用BIM技术解决上述问题，实现了高标准设计、高质量建设、高水平管理。通过此次综合应用，项目建立了由业主驱动，全过程、多参与方协同的BIM实施体系，形成了设计BIM向施工BIM过渡的方法经验，总结了BIM与施工生产业务流程相融合的管理模式。针对设计阶段复杂钢结构的空间定位、曲面幕墙的“深化+加工+施工”技术、基于BIM的“进度+资源+工作”计划管理提出了新的管理思路。本项目结合实际对BIM技术在大型场馆的应用进行探索，通过BIM技术在各个专业的应用，总结BIM技术对促进项目实施的帮助，为以后BIM技术在大型场馆工程应用提供了可参考性资料和有力的支撑。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-11-23 Cooperative journals: 《工程热物理学报》
Abstract：低温烟气热能的高效梯级利用是火电厂节能减排的重要方向之一。本文结合某1000MW超临界机组，对常规低温省煤器烟气余热利用系统进行了热力学分析，发现该系统可使系统发电标准煤耗率降低2.50 g•(kW•h)-1，但?分析发现，空气预热器耗散?占输入?的22.03%，多于锅炉排烟所携带的?。为此，本文提出了集成SCO2动力循环的火电厂低温烟气热能利用系统，旨在减少空气预热器中的?耗散。对SCO2动力循环参数进行了优化，在优化参数下该系统可以使发电标准煤耗率降低3.62 g•(kW•h)-1，进一步集成低温省煤器可使发电标准煤耗率降低达5.58 g•(kW•h)-1，最后采用?分析结果解释了系统节能的本质原因。
Subjects: Dynamic and Electric Engineering >> Engineering Thermophysics submitted time 2017-10-30 Cooperative journals: 《工程热物理学报》
Abstract：低温烟气热能的高效梯级利用是火电厂节能减排的重要方向之一。本文结合某1000MW超临界机组，对常规低温省煤器烟气余热利用系统进行了热力学分析，发现该系统可使系统发电标准煤耗率降低2.50 g•(kW•h)-1，但?分析发现，空气预热器耗散?占输入?的22.03%，多于锅炉排烟所携带的?。为此，本文提出了集成SCO2动力循环的火电厂低温烟气热能利用系统，旨在减少空气预热器中的?耗散。对SCO2动力循环参数进行了优化，在优化参数下该系统可以使发电标准煤耗率降低3.62 g•(kW•h)-1，进一步集成低温省煤器可使发电标准煤耗率降低达5.58 g•(kW•h)-1，最后采用?分析结果解释了系统节能的本质原因。
Subjects: Biology >> Zoology submitted time 2017-10-10 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究无抗生素饲粮中添加德氏乳杆菌对育肥猪胴体性状、肉品质及背最长肌营养成分的影响。试验选用健康、平均体重为（65.34±3.64） kg的“杜×（长×大）”育肥猪120头，随机分为2个组，每组6个重复，每个重复10头猪（公母各占1/2）。对照组饲喂无抗生素基础饲粮，试验组饲喂在无抗生素基础饲粮中添加0.1%德氏乳杆菌的饲粮。试验期42 d。结果表明：2组育肥猪的胴体性状差异不显著（P>0.05）；与对照组相比，试验组育肥猪的脾重率和胰重率显著升高（P0.05），宰后24 h时，与对照组相比，试验组育肥猪肉的黄度显著升高（P<0.05），剪切力显著降低（P<0.05）；与对照组相比，试验组育肥猪背最长肌中甘氨酸、丙氨酸和风味氨基酸含量显著升高（P<0.05），葵酸和棕榈酸含量显著降低（P<0.05），棕榈油酸、亚油酸和多不饱和脂肪酸含量显著升高（P<0.05）。结果提示，无抗生素饲粮中添加0.1%德氏乳杆菌对育肥猪的胴体性状、肉品质及肉中营养成分具有一定改善作用。
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