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Determination of Surface Roughness in Wire and Arc Additive Manufacturing Based on Laser Vision Sensing

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Chinese Journal of Mechanical Engineering 2018年第4期31卷 133-139页

作者： Jun Xiong Yan-Jiang Li Zi-qiu yin Hui Chen School of Materials Science and Engineering Southwest Jiaotong University

Wire and arc additive manufacturing(WAAM) shows a great promise for fabricating fully dense metal parts by means of melting materials in layers using a welding heat source. However, due to a large layer height produced in WAAM, an unsatisfactory surface roughness of parts processed by this technology has been a key issue. A methodology based on laser vision sensing is proposed to quantitatively calculate the surface roughness of parts deposited by *** for a camera and a laser plane of the optical system are presented. The reconstruction precision of the laser vision system is verified by a standard workpiece. Additionally, this determination approach is utilized to calculate the surface roughness of a multi-layer single-pass thin-walled part. The results indicate that the optical measurement approach based on the laser vision sensing is a simple and effective way to characterize the surface roughness of parts deposited by WAAM. The maximum absolute error is less than 0.15 mm. The proposed research provides the foundation for surface roughness optimization with different process parameters.

关键词： Wire and arc additive manufacturing Surface roughness measurement Laser vision sensing Three-dimensional reconstruction

老年冠心病合并心律失常患者予以稳心颗粒联合美托洛尔治疗的效果探究

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中国实用医药 2024年第4期19卷 101-103页

作者：殷球明曾海霞江西省信丰县中医院 341600

目的分析老年冠心病合并心律失常患者应用稳心颗粒联合美托洛尔治疗的临床效果。方法选取冠心病合并心律失常的70例老年患者作为研究对象,随机分为常规治疗组和联合治疗组,各35例。常规治疗组应用常规治疗,联合治疗组在常规治疗基础上... 详细信息

目的分析老年冠心病合并心律失常患者应用稳心颗粒联合美托洛尔治疗的临床效果。方法选取冠心病合并心律失常的70例老年患者作为研究对象,随机分为常规治疗组和联合治疗组,各35例。常规治疗组应用常规治疗,联合治疗组在常规治疗基础上采用稳心颗粒联合美托洛尔治疗。对比两组患者的治疗效果、心律失常发作频率和持续时间、不良反应发生情况。结果联合治疗组患者的治疗总有效率97.1%明显优于常规治疗组的82.9%,差异具有统计学意义(P<0.05)。联合治疗组心律失常发作频率(12.3±2.8)次/d、持续时间(20.8±1.2)min/d少于常规治疗组的(22.6±1.2)次/d、(30.5±1.5)min/d,差异具有统计学意义(P<0.05)。联合治疗组不良反应发生率11.4%低于常规治疗组的45.7%,差异有统计学意义(P<0.05)。结论对老年冠心病合并心律失常患者应用稳心颗粒联合美托洛尔治疗,治疗效果显著,值得推广。

关键词：冠心病心律失常稳心颗粒美托洛尔老年

Design, synthesis, and biological evaluation of ligustrazine/resveratrol hybrids as potential anti-ischemic stroke agents

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Chinese Journal of Natural Medicines 2020年第8期18卷 633-640页

作者： ZHANG yin-qiu WU Jian-Bing yin Wei ZHANG Yi-Hua HUANG Zhang-Jian State Key Laboratory of Natural Medicines Jiangsu Key Laboratory of Drug Discovery for Metabolic DiseasesCenter of Drug DiscoveryChina Pharmaceutical UniversityNanjing 210009China

To search for potent anti-ischemic stroke agents,a series of tetramethylpyrazine(TMP)/resveratrol(RES)hybrids 6 a-t were designed and *** hybrids inhibited adenosine diphosphate(ADP)-or arachidonic acid(AA)-induced platelet aggregation,among them,6 d,6 g-i,6 o and 6 q were more active than *** most active compound 6 h exhibited more potent antiplatelet aggregation activity than TMP,RES,as well as positive control ticlopidine(Ticlid)and aspirin(ASP).Furthermore,6 h exerted strong antioxidative activity in a dose-dependent manner in rat pheochromocytoma PC12 cells which were treated with hydrogen peroxide(H2 O2)or hydroxyl radical(·OH).Importantly,6 h significantly protected primary neuronal cells suffered from oxygen-glucose deprivation/reoxygenation(OGD/R)injury,comparable to an anti-ischemic drug edaravone(Eda).Together,our findings suggest that 6 h may be a promising candidate warranting further investigation for the intervention of ischemic stroke.

关键词： Ligustrazine Resveratrol Hybrids Anti-platelet aggregation Antioxidant Ischemic stroke

Comparative study of galectin-3 and B-type natriuretic peptide as biomarkers for the diagnosis of heart failure

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Journal of Geriatric Cardiology 2014年第1期11卷 79-82页

作者： qiu-Sheng yin Bing SHI Lan Dong Lei BI Department of Geriatric Cardiology General Hospital of Be~jing Command of PLA Beijing 100700 China

Background Heart failure （HF） is a common disease with complex pathophysiological causes. The diagnosis of HF commonly relies on comprehensive analyses of medical history and symptoms, and results from echocardiography and biochemical tests. Galectin-3, a rela-tively new biomarker in HF, was approved by the US Food and Drug Administration in 2010 as a marker in the stratification of risk for HF. We assessed galectin-3 as a biomarker for HF diagnosis in patients with preserved ejection fraction （pEF） and compared its performance with that of B-type natriuretic peptide （BNP）. Methods Thirty-five pEF patients with HF （HFpEF group） and 43 pEF patients without HF （control group） were enrolled. Plasma levels of galectin-3 and BNP in HFpEF and control subjects were determined. Sensitivity, specificity, pre dictive values, and accuracy of galectin-3 and BNP as markers for HF diagnosis were calculated and compared. Results Levels of galec- tin-3 and BNP were 23.09 ±6.97 ng/mL and 270.46 ± 330.41 pg/mL in the HFpEF group, and 16.74 ± 2.75 ng/mL and 59.94 ± 29.93 pg/mL in the control group, respectively. Differences in levels of galectin-3 and BNP between the two groups were significant （P 〈 0.01）. As a bio- marker for HF diagnosis in study subjects, galectin-3 showed sensitivity and specificity of 94.3% and 65.1%, respectively, at a cutoff value of 17.8 ug/mL. BNP showed sensitivity and specificity of 77.1% and 90.7%, respectively, at a cutoff value of 100 pg/mL. Galectin-3 was a significantly more sensitive （P 〈 0.05） but less specific （P 〈 0.01） biomarker compared with BNP. Differences in positive predictive value, negative predictive value, and accuracy between galectin-3 and BNP markers were not significant （P 〉 0.05）. Areas under the receiver operating characteristic curve （95% confidence interval） were 0.891 （0.808-0.974） and 0.896 （0.809-0.984） for galectin-3 and BNP, respec- tively, with no significant difference between the two values （P 〉 0.05）. Conclusions The leve

关键词： Heart failure Preserved ejection fraction Galectin-3 B-type natriuretic peptide Diagnosis

高强度农业种植区不同景观池塘氧化亚氮排放特征

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环境科学 2024年第4期45卷 2385-2393页

作者：张欣悦肖启涛谢晖刘臻婧邱银国罗菊花徐向华段洪涛南京信息工程大学气象灾害预报预警与评估协同创新中心南京210044 中国科学院南京地理与湖泊研究所流域地理学重点实验室南京210008 湖南省气候中心长沙410118

农业流域水体氮循环过程与农业活动有着十分紧密联系,会随着农业活动的持续进行而成为大气N_(2)O的重要排放源.小型池塘具有灌溉、蓄水和纳污等多种功能,是农业种植区和农村景观的重要组成部分.以巢湖北岸典型农业流域烔炀河流域为研究... 详细信息

农业流域水体氮循环过程与农业活动有着十分紧密联系,会随着农业活动的持续进行而成为大气N_(2)O的重要排放源.小型池塘具有灌溉、蓄水和纳污等多种功能,是农业种植区和农村景观的重要组成部分.以巢湖北岸典型农业流域烔炀河流域为研究对象,选取3种不同类型(村塘、农塘和水塘),共计6个池塘,于2020年9月至2021年9月连续采样观测,探究了农业流域不同景观池塘N_(2)O排放特征及其影响因素.结果表明,用于生活污水承纳的村塘N_(2)O排放最高,其次为用于农业灌溉的农塘,其N_(2)O排放通量分别为流域自然水塘排放量[(1.33±2.50)μmol·(m^(2)·d)^(-1)]的8倍和4倍.连续观测表明不同景观池塘N_(2)O排放表现出明显的时间变化特征,但其N_(2)O排放时间变化的调控因子有所不同.其中,村塘与农塘N_(2)O排放主要受氮负荷和降雨影响,而远离村庄农田的水塘N_(2)O排放变化主要受水温驱动.烔炀河流域池塘是大气N_(2)O显著排放源,年均N_(2)O排放通量为(5.73±10.61)μmol·(m^(2)·d)^(-1),农业氮负荷输入是其N_(2)O高排放的主要原因,明晰池塘用途和类型对估算农业流域小型水体N_(2)O排放十分重要.

关键词：农业活动池塘水体 N_(2)O排放时空变化影响因素

依恋关系对抑郁患者的影响:人际信任的中介作用

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临床精神医学杂志 2024年第3期34卷 198-202页

作者：郑子蔚姚佳宇仇剑崟上海交通大学医学院附属精神卫生中心 200030

目的:了解抑郁患者的依恋关系和人际信任现状,探究人际信任在依恋关系和抑郁间的中介作用。方法:收集2019年10月至2022年3月就诊于上海市精神卫生中心咨询门诊抑郁患者(抑郁组)149例,同期招募健康对照组114名。采用亲密关系体验问卷修订... 详细信息

目的:了解抑郁患者的依恋关系和人际信任现状,探究人际信任在依恋关系和抑郁间的中介作用。方法:收集2019年10月至2022年3月就诊于上海市精神卫生中心咨询门诊抑郁患者(抑郁组)149例,同期招募健康对照组114名。采用亲密关系体验问卷修订版(experiences in close relationship-revised, ECR-R)、信任量表(trust scale)、信任游戏(trust game)分别测量依恋关系、人际信任态度和人际信任行为,使用汉密尔顿抑郁(Hamilton depression scale, HAMD-17)评估抑郁症状。结果:抑郁组的信任量表、信任投资游戏评分均低于对照组(P均<0.05),依恋焦虑和依恋回避评分均高于健康对照组(P均<0.001)。Pearson相关分析显示,依恋关系、信任问卷和信任投资游戏评分均与抑郁分数存在显著相关(P均<0.05)。依恋关系通过人际信任态度和行为预测抑郁的间接效应分别为0.112和0.032,分别占总效应的20.14%和5.76%。结论:依恋关系可直接或间接预测抑郁,人际信任态度和行为在依恋关系和抑郁间起部分中介作用。

关键词：抑郁症人际信任信任游戏依恋关系

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ON HAUSDORFF DIMENSION OF CERTAIN RIESZ PRODUCT IN LOCAL FIELDS

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Analysis in Theory and Applications 2007年第2期23卷 147-161页

作者： Hua qiu Weiyi Su yin Li Department of Mathematics Nanjing University Nanjing 210093 P. R. China

In this paper, we consider the Riesz product dμ =^∞∏j=1（1＋ajRexbjλj（x））dx in local fields, and we obtain the upper and lower bound of its Hausdorff dimension.

关键词： Riesz product Hausdorff dimension local field p-series field

Research on Credit Regulation Mechanism of E-commerce Platform Based on Evolutionary Game Theory

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Journal of Systems Science and Systems Engineering 2024年第3期33卷 330-359页

作者： Zeguo qiu Yuchen yin Yao Yuan Yunhao Chen School of Computer and Information Engineering Harbin University of CommerceHarbin150028China School of Management Harbin University of CommerceHarbin150028China

In the growing e-commerce industry,the problem of malicious business operations has become increasingly prominent,exposing many problems such as weak supervision of e-commerce platforms and no way for consumers to *** order to solve the problems of counterfeit and shoddy products on e-commerce platforms and promote the sustainable development of the e-commerce industry in China,this paper constructs a three-party evolutionary game model of e-commerce platforms,merchants,and consumers,investigates the influence of each influencing factor on each party’s strategy choice,and provides targeted suggestions to e-commerce platforms based on relevant ***,the impact of several important parameters on the equilibrium solution is discussed through sensitivity *** results show that:1)the smaller the cost difference between active and negative regulation,the more the e-commerce platform tends to active regulation strategy,but increasing fines for dishonest merchants and consumer complaints have little impact on the e-commerce platform;2)increasing consumer compensation,creating an honest business environment,and reducing the cost of honest business all help companies tend to operate in good faith;3)the only factor that affects the tendency of consumer complaint strategies is the cost of *** loss suffered by silence and the compensation given to consumers have little effect on consumers’tendency to complain *** results can provide theoretical guidance for participants to make useful strategic decisions in the e-commerce market.

关键词： Evolutionary game e-commerce data simulation

Genetic Structure Analysis of Human Remains from Khitan Noble Necropolis

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Chemical Research in Chinese Universities 2006年第2期22卷 123-128页

作者： XU Yue ZHANG Xiao-lei CUI yin-qiu ZHANG Quan-chao ZHOU Hui ZHU Hong Ancient DNA Laboratory Research Center for Chinese Frontier Archaeology Jilin University Changchun 130012 P. R. China Macromolecular Laboratory College of Life Science Jilin University Changchun 130021 P. R. China

Ancient DNA was extracted from 13 skeletal remains from the burial groups of Khitan nobles, which were excavated in northeast China. The hypervariable segment Ⅰ sequences （ HVS Ⅰ ） of the mitochondrial DNA control region, in the 13 individuals, were used as genetic markers to determine the genetic relationships between the individuals and the genetic affinity to other interrelated populations by using the known database of mtDNA. Based on the phylogenetic analysis of these ancient DNA sequences, the genetic structures of two Khitan noble kindreds were obtained, including the Yel Yuzhi＇s kindred and the Xiao He＇s kindred. Furthermore, the relationships between the Khitan nobles and some modern interrelated populations were analyzed. On the basis of the result of the analysis, the gene flows of the ancient Khitans and their demographic expansion in history was deduced.

关键词： Ancient DNA Khitan Mitochondrial DNA Phylogenetic analysis