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Iterative reverse deformation optimization design of castings based on numerical simulation of solidification thermal stress

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China Foundry 2022年第4期19卷 342-350页

作者： yu-hao chen Dun-ming Liao Wei-dong Li Tao chen Ming Yang Jun-ke Shi State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Luoyang Sunrui Titanium Precision Casting Co. Ltd.Luoyang 471003HenanChina Wuhan chenxi yunfeng Technology Co. Ltd.Wuhan 430074China

In the casting process,in order to compensate for the solidification shrinkage to obtain higher dimensional accuracy of the casting,it is often necessary to modify the original design of castings,and a suitable compensation method has a decisive impact on the dimensional accuracy of the actual *** this study,based on solidification simulation,a design method of reverse deformation is proposed,and two compensation methods,empirical compensation and direct reverse deformation,are *** simulation results show that the empirical compensation method has problems such as difficulty in determining the parameters and satisfaction of both the overall and local accuracy at the same time;while based on the simulation results for each node of the casting,the direct reverse deformation design achieves the design with *** addition,the casting model can be optimized through iterative revisions,so that higher dimensional accuracy can be continuously obtained in the subsequent design ***,the direct reverse deformation design is more accurate and reasonable compared to empirical compensation method.

关键词： casting simulation thermal stress deformation dimensional compensation dimensional accuracy

Metabolic syndrome and gallstone disease

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World Journal of Gastroenterology 2012年第31期18卷 4215-4220页

作者： Li-Ying chen Qiao-Hua Qiao Shan-Chun Zhang yu-hao chen Guan-Qun Chao Li-Zheng Fang Department of Family Medicine Sir RunRun Shaw Hospital Zhejiang University Hangzhou 310016Zhejiang Province China Department of Epidemiology and Biosta-tistics School of Public Health Zhejiang University Hangzhou310058 Zhejiang Province China

AIM： To investigate the association between metabolic syndrome （NetS） and the development of gallstone disease （GSD）. METHODS： A cross-sectional study was conducted in 7570 subjects （4978 men aged 45.0：1：8.8 years, and 2592 women aged 45.3：1：9.5 years） enrolled from the physical check-up center of the hospital. The subjects included 918 patients with gallstones （653 men and 265 women） and 6652 healthy controls （4325 men and 2327 women） without gallstones. Body mass index （BII）, waist circumference, blood pressure, fasting plasma glucose （FPG） and serum lipids and lipoproteins levels were measured. Colorimetric method was used to measure cholesterol, high-density lipoprotein cho- lesterol （HDL-C） and low-density lipoprotein cholesterol （LDL-C）. Dextrose oxidizing enzyme method was used to measure FPG. Subjects were asked to complete a questionnaire that enquired about the information on demographic data, age, gender, histories of diabetes mellitus, hypertension, and chronic liver disease and so on. Metabolic syndrome was diagnosed according to the Adult Treatment Panel HI （ATP ]3） criteria. Gall- stones were defined by the presence of strong intralu- minal echoes that were gravity-dependent or attenu- ated ultrasound transmission. RESULTS： Among the 7570 subjects, the prevalence of the gallstone disease was 12.1% （13.1% in men and 10.2% in women）. BMI, waist circumference, systolic blood pressure, diastolic blood pressure, fasting blood glucose and serum triglyceride （TG） in cases group were higher than in controls, while serum high-density lipid was lower than in controls. There were significant differences in the waist circumference, blood pressure, FPG and TG between cases and controls. In an age- adjusted logistic regression model, metabolic syndrome was associated with gallstone disease. The age-adjust- ed odds ratio of MetS for GSD in men was 1.29 [95% confidence interval （CI）, 1.09-1.52; P = 0.0030], and 1.68 （95% CI, 1.26-2.25; P = 0.0004） in women; the overa

关键词： Gallstone disease Obesity Hypertension Dyslipidemia Metabolic syndrome

Multi-twinned gold nanoparticles with tensile surface steps for efficient electrocatalytic CO_(2) reduction

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Science China Chemistry 2022年第11期65卷 2188-2196页

作者： Li-Wei chen yu-chen hao Jiani Li Linyu Hu yu Guo Shuai Li Di Liu Zhejiaji Zhu Si-Qian Wu Hui-Zi Huang An-Xiang Yin Bo Wang Ya-Wen Zhang Ministry of Education Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technology Research Institute(Jinan)School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and ApplicationsPKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic ChemistryCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

CO_(2) reduction reactions(CO_(2)RR) powered by renewable electricity can directly convert CO_(2) to hydrocarbons and fix the intermittent sustainable energy in portable chemical fuels. It is of great importance to develop advanced catalysts that can boost CO_(2)RR with high activity, selectivity, and efficiency at low overpotentials. Here, we report the solution synthesis using H_(2)O_(2) to modify the surface structures of gold multi-twinned nanoparticles(AuMPs) and create tensile surface steps. Calculations predicted significantly enhanced CO_(2) adsorption and boosted CO_(2)RR capabilities with inhibited hydrogen evolution reaction activity for the tensile surface steps with modified electronic structure. The H_(2)O_(2)-treated AuMPs with surface steps and 3.83% tensile lattices showed much higher activity and selectivity at lower overpotentials for CO_(2)RR than pristine gold *** CO-production current density reached about 98 mA cm^(-2) with a Faradaic efficiency of 95.7% at -0.30 V versus reversible hydrogen electrode in the flow cell, showing a half-cell energy efficiency as high as ~83%. Our strategy represents a rational catalyst design by engineering the surface structures of metal nanoparticles and may find more applicability in future electrocatalysis.

关键词： gold nanoparticles tensile lattice surface steps electrocatalysis CO_(2)reduction

Particle concentration effect in adsorption/desorption of Zn(Ⅱ) on anatase type nano TiO_2

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Journal of Environmental Sciences 2007年第12期19卷 1442-1445页

作者： YANG yu-huan chen hao PAN Gang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China.

Adsorption/desorption in a new Zn（Ⅱ）-TiO2 adsorption system was investigated at different particle concentrations （Cp）. TEM, SEM and XRD analyses revealed that the TiO2 particles were an aggregation of nano-sized （approximately 10 nm） pure anatase-type TiO2. Adsorption experiments were carried out with particle concentrations of 100, 400 and 1000 mg/L, and their adsorption isotherms were found to decline successively, showing an obvious Cp effect. Desorption experiments indicated that adsorption in this system was irreversible, and the irreversibility increased with increasing Cp. These phenomena could be explained by the MEA （metastable equilibrium adsorption） theory and the Cp effect could be modeled well with an MEA-Freundlich-type Cp effect isotherm equation. This study may heln understand environmental behavior of contaminants on ultrafine natural particles.

关键词： Zn(Ⅱ) anatase-type Ti02 particle concentrations effect adsorption desorption

Study on a New Ultraviolet Sterilizer to the Surface Disinfection of the Ultrasound Probe

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Biomedical and Environmental Sciences 2018年第2期31卷 163-167页

作者： chen Gui Qiu chen yu hao YI Liang YIN Jin GAO Qiong SONG Jiang Nan LI Shi Kang chen Pei Hou GUO Gui Ping Hunan Provincial Center for Disease Control and Prevention Changsha 410005HunanChina Xiangya School of Medicine Central South UniversityChangsha 410008HunanChina

We studied the disinfection effect of a new ultraviolet （UV） sterilizer and its utilization on ultrasound probe surfaces. Carrier quantitative germicidal tests, simulated on-the-spot trials, and organic substance influence tests were used to carry out experimental observation. Artificially infected probes were disinfected using the sterilizer or a germicidal lamp for comparison. The total number and types of bacteria were determined and identified. Our results demonstrated the sterilizer had the best disinfection effect among three different disinfection methods in hospital. The sterilizer has been used in a hospital setting for 2 years with no notable damage to the ultrasound probe instrument. It has the advantages of fast disinfection, high disinfection effect, and good compatibility with the ultrasound instrument, worthy of being a promoted application in medical institutions.

关键词： Study on a New Ultraviolet Sterilizer to the Surface Disinfection of the Ultrasound Probe

Multi-twinned gold nanoparticles with tensile surface steps for efficient electrocatalytic COreduction

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Science China Chemistry 2022年

作者： Li-Wei chen yu-chen hao Jia-Ni Li Lin-yu Hu yu Guo Shuai Li Di Liu Zhe-Jia-Ji Zhu Si-Qian Wu Hui-Zi Huang An-Xiang Yin Bo Wang Ya-Wen Zhang Ministry of Education Key Laboratory of Cluster Science Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technology Research Institute (Jinan) School of Chemistry and Chemical Engineering Beijing Institute of Technology Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications PKU-HKU Joint Laboratory in Rare Earth Materials and Bioinorganic Chemistry College of Chemistry and Molecular Engineering Peking University

COreduction reactions (CORR) powered by renewable electricity can directly convert COto hydrocarbons and fix the intermittent sustainable energy in portable chemical *** is of great importance to develop advanced catalysts that can boost CORR with high activity,selectivity,and efficiency at low ***,we report the solution synthesis using HOto modify the surface structures of gold multi-twinned nanoparticles (AuMPs) and create tensile surface *** predicted significantly enhanced COadsorption and boosted CORR capabilities with inhibited hydrogen evolution reaction activity for the tensile surface steps with modified electronic *** HO-treated AuMPs with surface steps and 3.83%tensile lattices showed much higher activity and selectivity at lower overpotentials for CORR than pristine gold *** CO-production current density reached about 98 mA cmwith a Faradaic efficiency of 95.7%at–0.30 V versus reversible hydrogen electrode in the flow cell,showing a half-cell energy efficiency as high as～83%.Our strategy represents a rational catalyst design by engineering the surface structures of metal nanoparticles and may find more applicability in future electrocatalysis.

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《乐邦文类》诗词类文本研究

哈尔滨工业大学学报（社会科学版） 2019年第3期21卷 96-101页

作者：陈昱昊武汉大学文学院武汉430072

净土宗的诗词具有独特的书写传统和审美特征,而《乐邦文类》是研究净土宗诗词这些特征的典型文本。其文本可分为念佛、怀净土、咏史三个主题。念佛主题文本的书写可分为劝念佛和观念佛两类,怀净土主题的文本书写中以西方净土和唯心净土... 详细信息

净土宗的诗词具有独特的书写传统和审美特征,而《乐邦文类》是研究净土宗诗词这些特征的典型文本。其文本可分为念佛、怀净土、咏史三个主题。念佛主题文本的书写可分为劝念佛和观念佛两类,怀净土主题的文本书写中以西方净土和唯心净土的调和与融汇为最突出特点,咏史主题文本虽以净土修行典范人物为书写对象却较少涉及其对信仰的弘传,有浓厚的世俗化色彩。毫无疑问,《乐邦文类》的诗词类文本展示出一个与世学诗词和禅宗文学迥异却少有人关注的艺术世界。

关键词：乐邦文类净土诗词类文本净土文学

Gradient‑Layered MXene/Hollow Lignin Nanospheres Architecture Design for Flexible and Stretchable Supercapacitors

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Nano-Micro Letters 2025年第2期17卷 447-462页

作者： haonan Zhang cheng hao Tongtong Fu Dian yu Jane Howe Kaiwen chen Ning Yan hao Ren Huamin Zhai Jiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass Materials NanJing Forestry UniversityNanjing 210037People’s Republic of China Department of Chemical Engineering and Applied Chemistry University of Toronto200 College StreetTorontoON M5S 3E5Canada Department of Materials Science and Engineering University of Toronto184 College StreetTorontoON M5S 3E4Canada College of Materials Science and Engineering Nanjing Forestry UniversityNanjing 210037People’s Republic of China

With the rapid development of flexible wearable electronics,the demand for stretchable energy storage devices has *** this work,a novel gradient-layered architecture was design based on single-pore hollow lignin nanospheres(HLNPs)-intercalated two-dimensional transition metal carbide(Ti_(3)C_(2)T_(x) MXene)for fabricating highly stretchable and durable *** depositing and inserting HLNPs in the MXene layers with a bottom-up decreasing gradient,a multilayered porous MXene structure with smooth ion channels was constructed by reducing the overstacking of MXene ***,the micro-chamber architecture of thin-walled lignin nanospheres effectively extended the contact area between lignin and MXene to improve ion and electron accessibility,thus better utilizing the pseudocapacitive property of *** these strategies effectively enhanced the capacitive performance of the *** addition,HLNPs,which acted as a protective phase for MXene layer,enhanced mechanical properties of the wrinkled stretchable electrodes by releasing stress through slip and deformation during the stretch-release cycling and greatly improved the structural integrity and capacitive stability of the *** electrodes and symmetric flexible all-solid-state supercapacitors capable of enduring 600%uniaxial tensile strain were developed with high specific capacitances of 1273 mF cm^(−2)(241 F g^(−1))and 514 mF cm^(−2)(95 F g^(−1)),***,their capacitances were well preserved after 1000 times of 600%stretch-release *** study showcased new possibilities of incorporating biobased lignin nanospheres in energy storage devices to fabricate stretchable devices leveraging synergies among various two-dimensional nanomaterials.

关键词： Hollow lignin nanospheres MXene Gradient-layered architecture Wrinkled electrodes Stretchable supercapacitors

“差价补偿”的博弈分析——以福州家电零售业为例

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商业研究 2005年第21期 189-191,201页

作者：陈豫浩福建经济管理干部学院福建福州350002

“差价补偿”在国内一些城市的某些商品零售业出现,有人认为它是价格战的一种新的形式,担心“差价补偿”的推出,会导致价格大战一触即发。实际上,“差价补偿”不是价格战的一种新的形式,而是想避免打价格战的一种策略,在博弈论中称之为... 详细信息

“差价补偿”在国内一些城市的某些商品零售业出现,有人认为它是价格战的一种新的形式,担心“差价补偿”的推出,会导致价格大战一触即发。实际上,“差价补偿”不是价格战的一种新的形式,而是想避免打价格战的一种策略,在博弈论中称之为“策略性行动”。它是寡头垄断市场中具有较强实力的企业,期望通过做出限制自己行为的承诺来限制其竞争对手的选择,实施“差价补偿”策略的目的是促使竞争对手采取合作的态度,选择与本企业相接近的价格,进而避免出现两败俱伤或几败俱伤的“囚犯困境”的结局。

关键词：差价补偿价格战博弈分析