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Synthesis of Boron-doped Diamond/Porous Ti Composite Materials——Effect of Carbon Concentration

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Journal of Wuhan University of Technology(Materials Science) 2012年第2期27卷 328-332页

作者：马明 chang ming 李晓伟 School of Electronics Information Engineering Tianjin University of TechnologyTianjin 300384China Tianjin Key Laboratory of Film Electronic and Communication Devices Tianjin 300384China

Highly boron-doped diamond films were deposited on porous titanium substrates by hot filament chemical vapor deposition technique. The morphology variation of highly boron-doped diamond films grown on porous titanium substrates was investigated, and the effects of carbon concentration on nucleation density and diamond growth were also studied. The continuous change of surface morphology and structure of diamond film were characterized by scanning electron microscopy. The structures of diamond film and interlayer were analyzed by X-ray diffraction. The quality of boron-doped diamond film was confirmed by visible Raman spectroscopy. The experimental results reveal that surface morphology and quality of boron-doped diamond films are various due to the change of carbon concentration. The thickness of intermediate layer decreases with the carbon concentration increasing.

关键词： boron-doped diamond film porous titanium carbon concentration

自体血回输技术在体外循环下成人瓣膜置换术中的临床应用

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中国标准化 2024年第6期 301-304页

作者：常明明孟金金刘戈施超蚌埠医科大学第一附属医院

目的:分析自体血回输技术在体外循环下成人瓣膜置换术中的临床应用效果。方法:调阅蚌埠医科大学第一附属医院心脏外科病例,选出在2020年3月—2023年1月进行瓣膜置换术的成年患者共104例。均采取择期体外循环下瓣膜置换术治疗,以输血方... 详细信息

目的:分析自体血回输技术在体外循环下成人瓣膜置换术中的临床应用效果。方法:调阅蚌埠医科大学第一附属医院心脏外科病例,选出在2020年3月—2023年1月进行瓣膜置换术的成年患者共104例。均采取择期体外循环下瓣膜置换术治疗,以输血方式不同分组,其中52例实施异体输血,另外52例采取自体血回输。对比两组相关指标。结果:观察组术后凝血功能较对照组高(P<0.05);观察组输血不良反应低于对照组(P<0.05);观察组术中、术后RBC、血浆用量及总用量均少于对照组,输血费用更低(P<0.05);观察组术后机械通气时间、ICU停留时间、术后住院时间均短于对照组,24 h引流量低于对照组(P<0.05)。结论:自体血回输技术能够有效维持体外循环下成人瓣膜置换术患者的凝血功能,耗时短,可避免大量输血,能够降低输血费用,促使患者术后尽早康复。

关键词：成人瓣膜置换术体外循环自体血回输技术

The Method of Single Peak Fourier Analysis of Measuring the Size of Mosaic Block and Microstrain by X-ray Diffraction

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Journal of Materials Science & Technology 2000年第1期16卷 67-70页

作者： ming chang (Tianjin Institute of Technology, Tianjin 300191, China) Tianjin Institute of Technology Tianjin 300191 China

The values of mosaic block size and microstrain measured by the method of Voigt function are sometimes largely erroneous and difficult to be revised. In this paper, the causes of the 'hook effect' which inevitably exists in the method of Fourier analysis are explained; then the method for resolving this effect is put forward; and finally the method of hypothetical function is used to simplify the method of the Fourier analysis from multi-peak to single-peak. By introducing the parameter m, this method can not only indicate the degree of errors, but also revise them as well, it is simple, clear and able to accomplish the intricate pattern calculation quickly by the aid of computer. In the end, we argue the identity between method of the approximate function and the Fourier analysis, and give a more accurate proportional coefficient k.

关键词： Measurement theory

塑性变形理论建模新范式:人工智能赋能和数据科学驱动

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塑性工程学报 2024年第1期31卷 2-14页

作者：何霁江晟达刘霄郭聪钱昌明李淑慧上海交通大学机械系统与振动国家重点实验室上海200240 上海交通大学上海市复杂薄板结构数字化制造重点实验室上海200240

传统塑性变形理论基于唯象方法,主要依赖于开发者的经验并通过拟合已得到的实验数据来获取,具有强烈的局限性。随着材料微观结构和力学性能的复杂程度不断提高,开发更为复杂的唯象本构模型已经极其困难。材料模型不通用、难以联系材料... 详细信息

传统塑性变形理论基于唯象方法,主要依赖于开发者的经验并通过拟合已得到的实验数据来获取,具有强烈的局限性。随着材料微观结构和力学性能的复杂程度不断提高,开发更为复杂的唯象本构模型已经极其困难。材料模型不通用、难以联系材料性能和制造过程成为制约塑性成形加工的主要问题之一,也为塑性理论的发展提出严峻挑战。人工智能与数据科学的发展为材料和机械科学带来了新的机遇,随着材料设计和应用的快速发展,不需要传统的显式本构模型,反映材料微观结构和宏观性能之间关系的塑性变形理论建模方法应运而生。其中,以物理规律增强神经网络建模、高效多尺度聚类分析、数据驱动免本构建模为代表的理论建模新范式具有其鲜明的特色和显著优势,是极具潜力的模拟预测方法。通过对这3个方面的总结梳理,探讨了人工智能赋能和数据科学驱动的塑性理论建模及多尺度模拟技术开发的发展现状与未来趋势。

关键词：数据驱动多尺度计算力学机器学习无本构模拟

Comparison of presentation and impact on quality of life of gastroesophageal reflux disease between young and old adults in a Chinese population

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World Journal of Gastroenterology 2011年第41期17卷 4614-4618页

作者： Shou-Wu Lee Chia-ming chang Chi-Sen chang Ai-Wen Kao ming-Chih Chou Institute of Medicine Chung Shan Medical University Division of Gastroenterology Department of Internal MedicineTaichung Veterans General Hospital Department of Medicine Chung Shan Medical University Institute of Gerontology National Cheng Kang University Division of Geriatrics Department of Internal MedicineNational Cheng Kang University Hospital Division of Gastroenterology Department of Internal MedicineNational Cheng Kang University Hospital

AIM:To compare the presentation and impact on qual-ity of life of gastroesophageal reflux disease(GERD)in old and young age ***:Data from adult patients with GERD di-agnosed by endoscopic and symptomic characteristics were collected between January and November *** criteria included combined peptic ulcers,ma-lignancy,prior surgery,antacid medication for more than 2 mo,and *** patients were assigned to the elderly group if they were 65 years or older,or the younger group if they were under 65 *** had completed the GERD impact scale,the Chinese GERD questionnaire,and the SF-36 *** from other cases without endoscopic f ind-ings or symptoms were collected and these subjects comprised the control group in our ***:There were 111 patients with GERD and 44 normal cases:78(70.3%)and 33 patients(29.7%)were in the younger and elderly groups,*** were more female patients(60.3%)in the younger group,and more males(72.7%)in the elderly *** younger cases had more severe and fre-quent typical symptoms than the elderly ***-nif icantly more impairment of daily activities was noted in the younger patients compared with the elderly group,except for physical ***:Elderly patients with GERD were pre-dominantly male with rare presentation of typical symp-toms,and had less impaired quality of life compared with younger patients in a Chinese population.

关键词： Gastroesophageal reflux disease Quality oflife Age factors

Comparison of different sampling strategies for debris flow susceptibility mapping: A case study using the centroids of the scarp area, flowing area and accumulation area of debris flow watersheds

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Journal of Mountain Science 2021年第6期18卷 1476-1488页

作者： GAO Rui-yuan WANG chang-ming LIANG Zhu College of Construction Engineering Jilin UniversityChangchun 130012China

The quality of debris flow susceptibility mapping varies with sampling strategies. This paper aims at comparing three sampling strategies and determining the optimal one to sample the debris flow watersheds. The three sampling strategies studied were the centroid of the scarp area(COSA), the centroid of the flowing area(COFA), and the centroid of the accumulation area(COAA) of debris flow watersheds. An inventory consisting of 150 debris flow watersheds and 12 conditioning factors were prepared for research. Firstly, the information gain ratio(IGR) method was used to analyze the predictive ability of the conditioning factors. Subsequently, 12 conditioning factors were involved in the modeling of artificial neural network(ANN), random forest(RF) and support vector machine(SVM). Then, the receiver operating characteristic curves(ROC) and the area under curves(AUC) were used to evaluate the model performance. Finally, a scoring system was used to score the quality of the debris flow susceptibility maps. Samples obtained from the accumulation area have the strongest predictive ability and can make the models achieve the best performance. The AUC values corresponding to the best model performance on the validation dataset were 0.861, 0.804 and 0.856 for SVM, ANN and RF respectively. The sampling strategy of the centroid of the scarp area is optimal with the highest quality of debris flow susceptibility maps having scores of 373470, 393241 and 362485 for SVM, ANN and RF respectively.

关键词： Debris flow Artificial neural network Support vector machine Random forest Susceptibility Sampling strategy

Modeling turbulent heat fluxes over Arctic sea ice using a maximum-entropy-production approach

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Advances in Climate change Research 2021年第4期12卷 517-526页

作者： ZHANG Yi-ming SONG Mi-Rong DONG chang-ming LIU Ji-Ping School of Marine Science Nanjing University of Information Science and TechnologyNanjing210044China LASG Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519000China Department of Atmospheric and Environmental Sciences University at AlbanyState University of New YorkAlbanyNY12222USA

Recently,an algorithm of surface turbulent heat fluxes over snow/sea ice has been developed based on the theory of maximum entropy production(MEP),which is fundamentally different from the bulk flux algorithm(BF)that has been used in sea ice models for a few *** this study,we first assess how well the MEP algorithm captures the observed variations of turbulent heat fluxes over Arctic sea *** is found that the calculated heat fluxes by the MEP method are in good agreement with in-situ observations after considering the absorption of incoming radiation in a snow/ice surface layer with infinitesimal *** then investigate the effects of two different schemes(MEP ***)in the sea ice model of CICE6 on simulated turbulent heat fluxes and sea ice processes in the Arctic *** results show that the two different schemes give quite different representations of seasonal variations of heat fluxes,particularly for sensible heat fluxes in *** heat fluxes simulated by the MEP produce weak cooling effect on the ice surface in summer,whereas the BF generates a warming *** a result,compared to the BF,the MEP leads to a reduced seasonal cycle of Arctic sea ice mass flux by modulating snow-to-ice conversion,basal ice growth,surface ice melt and basal ice melt.

关键词： Sea ice modeling Turbulent heat fluxes Maximum-entropy-production Mass flux

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量子安全多方计算协议研究进展

中央民族大学学报（自然科学版） 2024年第1期33卷 46-53页

作者：张茹易鑫樊玲畅明信息光子学与光通信国家重点实验室北京100876 北京邮电大学理学院北京100876 天地互联与融合北京市重点实验室北京100876 北京邮电大学电子工程学院北京100876 运城职业技术大学信创学院山西运城044031

量子安全多方计算是量子信息技术与隐私保护计算技术相结合形成的新兴交叉领域,作为量子密码学的一个重要分支,在安全性、计算效率等方面有着经典安全多方计算所不能及的优点。量子安全多方求和(Quantum Secure Multi-party Summation,Q... 详细信息

量子安全多方计算是量子信息技术与隐私保护计算技术相结合形成的新兴交叉领域,作为量子密码学的一个重要分支,在安全性、计算效率等方面有着经典安全多方计算所不能及的优点。量子安全多方求和(Quantum Secure Multi-party Summation,QSMS)作为量子安全多方计算的一个最基本运算过程,近年来获得了广泛的关注。本文梳理了近期QSMS协议的研究进展,根据协议所依据的基本原理进行了分类,并介绍了一些代表性协议的基本原理和典型特点。

关键词：量子安全多方计算量子安全多方求和量子密码量子算法量子傅里叶变换

Tuning microwave absorption properties of Ti_(3)C_(2)T_(x) MXene-based materials:Component optimization and structure modulation

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Journal of Materials Science & Technology 2023年第17期148卷 150-170页

作者： ming chang Qingyu Li Zirui Jia Wanru Zhao Guanglei Wu Institute of Materials for Energy and Environment State Key Laboratory of Bio-fibers and Eco-textilesCollege of Materials Science and EngineeringQingdao UniversityQingdao 266071China College of Earth Sciences Jilin UniversityChangchun 130021China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China

The current electromagnetic environment brings a growing demand for efficient microwave absorption(MA)***_(3)C_(2)T_(x) MXene,one of the 2D transition-metal carbides,is considered to be a promising MA material owing to its superior dielectric properties and structural *** order to further improve the MA performance and environmental adaptability of Ti_(3)C_(2)T_(x) MXene,Ti_(3)C_(2)T_(x) MXene-based MA materials enhanced by composition and structure design have been extensively studied and the regu-lation ideas for its MA properties can be outlined as component optimization and structure manipulation strategies based on the microwave absorption ***,we briefly introduced the microwave absorption mechanism and focused on the design strategies of Ti_(3)C_(2)T_(x) MXene-based MA materials based on recent *** addition,the prospects of Ti_(3)C_(2)T_(x) MXene-based MA materials were also discussed.

关键词： Ti_(3)C_(2)T_(x)MXene Component optimization Structure manipulation Multifunctional materials Microwave absorption