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合质金提纯精炼过程中除杂工艺的探索与研究

金川科技 2024年第1期 32-34,55页

作者：刘文钊徐鹏马国强柴奎刘发存周玮金川集团铜业有限公司

贵金属冶炼分厂通过王水溶解-还原对合质金进行精炼提纯,得到金粉中杂质银含量较高,影响后续金锭品质。通过考察盐酸浓度、温度等影响因素,确定更优的工艺条件,提高氯化银的沉淀效率及程度,将还原得到的金粉通过热水、硝酸煮洗,得到品... 详细信息

贵金属冶炼分厂通过王水溶解-还原对合质金进行精炼提纯,得到金粉中杂质银含量较高,影响后续金锭品质。通过考察盐酸浓度、温度等影响因素,确定更优的工艺条件,提高氯化银的沉淀效率及程度,将还原得到的金粉通过热水、硝酸煮洗,得到品质达到国标IC-99.99的产品金粉。

关键词：氯浸还原金精炼氯化银

Level of proinsulin in association with cardiovascular risk factors and sleep snoring

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World Journal of Gastroenterology 2005年第32期11卷 5047-5052页

作者： En-Zhi Jia Zhi-Jian Yang Shi-Wei Chen Guang-Yao Qi Chun-fa You Jian-Feng ma Jing-Xin Zhang Zhen-Zhen Wang Wei-Chong Qian Hai-Yan Wang Wen-Zhu ma Department of Cardiovascular Medicine The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu Province China The Disease Control Center of Pizhou City Pizhou 221300 Jiangsu Province China Department of Central Clinical Laboratory The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu Province China Department of Nuclear Medicine The First Affiliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu Province China

AIM: To explore the relationship between the level of proinsulin with cardiovascular risk factors and sleep ***: Based on the random stratified sampling principle, 1 193 Chinese residents in Pizhou City, Jiangsu Province (530 males and 663 females, aged 35-59 years with an average age of 46.69 years) were recruited. Their sleep snoring habits were investigated. Biotin-avidin based double mabs ELISA was used to detect specific insulin and proinsulin, and a risk factor score was established to evaluate the individuals according to the number of their risk ***: The results of Spea.ma. correlation analysis and covariate ANOVA analysis after age and sex were controlled, indicated that not only the level of proinsulin (r = 0.156, P = 0.000, F= 5.980 P = 0.000), but also cardiovascular risk factors score (r = 0.194, P = 0.000,F= 11.135, P = 0.000) significantly associated with the frequency of sleep snoring, and the significant relationship between true insulin and frequency of sleep snoring was only shown in the covariate ANOVA analysis (F = 2.868,P = 0.022). The result of multivariate stepwise logistic regression after age, sex, body mass index, waist circumference and true insulin were controlled showed that proinsulin (division by interval of quartile) was an independent risk factor for sleep snoring (OR = 1.220,95%CI: 1.085-1.373, P = 0.001).CONCLUSION: The interaction of cardiovascular risk factors clustering, high proinsulin level and sleep breathing disorder may be a syndrome, which has not been recognized in human beings so far.

关键词： True insulin Proinsulin Snoring Epidemiology

Report on Childhood Obesity in China (9): Sugar-sweetened Beverages Consumption and Obesity

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Biomedical and Environmental Sciences 2012年第2期25卷 125-132页

作者： SHANG Xian Wen LIU Ai Ling ZHANG Qian HU Xiao Qi DU Song Ming ma Jun XU Gui fa LI Ying GUO Hong Wei DU Lin LI Ting Yu ma Guan Sheng National Institute for Nutrition and Food Safety Chinese Center for Disease Control and Prevention Beo＇ing 100021 China Union School of Public Health Peking Union Medical College Beijing 100730 China Beijing University Health Science Center Beijing 100191 China Shandong University Jinan 250012 Shandong China Public Health College Harbin Medical University Haerbin 150081 Heilongjiang China Fudan University Shanghai 200032 China Guangzhou Center for Diseases Prevention and Control Guangzhou 510440 Guangdong China Chongqing Children＇s Hospital Chongqing 400014 China

Objective To explore the associations between sugar-sweetened beverage （SSB） consumption and obesity as well as obesity-related cardiometabolic disorders among children in China. Methods A total of 6974 （boys 3558, girls 3412） children aged 6-13 years participated in the study. Each participant’s height, weight, waist circumference, fasting glucose, triglycerides, total cholesterol, high- density lipoprotein cholesterol, and low-density lipoprotein cholesterol were measured. The type of beverage consumption was determined using a self-administered questionnaire. Results SSBs were consumed regularly by 46.1% of the children. The prevalence [adjusted odds ratio （95% confidence internal （CI）] of obesity was 7.6% [as the reference group （ref.）], 10.1% [1.36（1.07, 1.74）], and 11.6% [1.46（1.21, 1.75）], among children who regularly drank milk, other beverages and SSBs, respectively. Regularly drinking SSBs elevated the likelihood of abdominal obesity [adjusted odds ratio （95% CI）： 1.36 （1.17, 1.59）]. The prevalence [adjusted odds ratio （95% CI）] of obesity among children who regularly drank sports/caloric beverages, carbonated beverages, sweet tea, and plant protein beverages was 16.8% [2.00（1.31, 3.07）], 12.7% [1.52（1.23, 1.88）], 11.5% [1.52（1.18, 1.95）], and 10.4% [1.41（1.03, 1.94）], respectively, which was higher than that of regular milk drinkers [7.6 % （ref.）]. The prevalence [adjusted odds ratio （95% CI）] of abdominal obesity among children who regularly drank sweet tea, fruit/vegetable juices, and carbonated beverages was 17.7% [1.55（1.26, 1.90）], 16.2% [1.36（1.09, 1.70）], and 15.3% [1.24（1.03, 1.50）], respectively, which was much higher than that of regular milk drinkers [12.8% （ref.）]. Conclusions Regular SSB consumption was positively related to obesity and abdominal obesity. This relationship should be investigated further using a longitudinal study design.

关键词： Sugar-sweetened Beverages Obesity Children

Effect of intermediate principal stress on strength of soft rock under complex stress states

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Journal of Central South University 2014年第4期21卷 1583-1593页

作者：马宗源廖红建党发宁 School of Civil Engineering and Architecture Xi'an University of Technology Department of Civil Engineering Xi'an Jiaotong University

A series of numerical simulations of conventional and true triaxial tests for soft rock materials using the three-dimensional finite difference code FLAC3D were presented. A hexahedral element and a strain hardening/softening constitutive model based on the unified strength theory(UST) were used to simulate both the consolidated-undrained(CU) triaxial and the consolidated-drained(CD) true triaxial tests. Based on the results of the true triaxial tests simulation, the effect of the intermediate principal stress on the strength of soft rock was investigated. Finally, an example of an axial compression test for a hard rock pillar with a soft rock interlayer was analyzed using the two-dimensional finite difference code FLAC. The CD true triaxial test simulations for diatomaceous soft rock suggest the peak and residual strengths increase by 30% when the effect of the intermediate principal stress is taken into account. The axial compression for a rock pillar indicated the peak and residual strengths increase six-fold when the soft rock interlayer approached the vertical and the effect of the intermediate principal stress is taken into account.

关键词： soft rock strength strain-softening complex stress state effect of intermediate principal stress

Design,Synthesis and Biological Evaluation of Bengamide Analogues as ClpP Activators

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Chinese Journal of Chemistry 2020年第10期38卷 1111-1115页

作者： Xue-Qing Kong Bing-Yan Wei Chen-Xi Yu Xiang Na Guan Wei-Ping ma Gang Liu Cai-Guang Yang fa-Jun Nan Chinese National Center for Drug Screening CAS Key Laboratory of Receptor ResearchStote Key Laboratory of Drug ResearchShanghai Institute of Materia MedicaChinese Academy of Sciences555 Zuchongzhi RoadShanghai 201203China University of Chinese Academy of Sciences No.19A Yuquan RoadBeijing 100049China Yantai Key Laboratory of Nanomedicine&Advanced Preparations Yantai Institute of Materia MedicaNo.39Science and Technology AvenueHigh-tech Industrial Development ZoneYantaiShandong 264000China

Summary of main observation and conclusion To combat multidrug-resistant Gram-positive bacteria,new antimicrobials particularly those with novel mechanism of action are badly *** with conventional antibiotics which are typical inhibitors,small-molecule activators of bacterial CIpP represent a new class of *** ClpP activator has been developed for clinical ***,we conducted a screening on our library of benga-mide-like ring opened analogues and found that L472-2 possesses a low minimum inhibitory concentration(MIC)against *** and shows no activity for ClpP activation in vitro,but it displayed reduced antibacterial activity against *** with clpP *** order to obtain bengamide analogues that activate ClpP in vitro as well as possess antibacterial activity,we perform further structural modifications starting from *** 37 re-mains the antimicrobial activity and activation of ClpP protein in vitro,which could be viewed as a new chemical scaffold for ClpP activators and worthy of further investigation.

关键词： analogues activation starting

Preparation of Mg and Ca metal by carbothermic reduction method–A thermodynamics approach

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Journal of magnesium and Alloys 2013年第3期1卷 263-266页

作者： fa-ping Hu Jia Pan Xin ma Xi Zhang Jie Chen Wei-dong Xie School of materials Science and Engineering Chongqing UniversityChongqing 400044PR China National Engineering Research Center for magnesium Alloys Chongqing 400044PR China

The Gibbs free energy and critical reaction conditions of preparing Mg and Ca metal by carbothermic reducing calcined dolomite were calculated and *** thermodynamic criterion for reduction reaction,including the critical temperature and vacuum degree,was *** results show that:when T/P^(0.0449)<1199.2,neither MgO nor CaO can be reduced by carbon;when T/P^(0.0449)≥1199.2 and T/P^(0.0462)<1350.9,MgO can be reduced while CaO can not be;when T/P^(0.0462)≥1350.9,both MgO and CaO can be *** to the requirements,we can obtain only Mg,Mg first then Ca,Mg and Ca simultaneously by controlling temperature,vacuum degree or both of them properly,by carbothermic reducing calcined dolomite.

关键词： Carbothermic reduction magnesium Calcium Thermodynamic Criterion

Identification of salinity-related genes in ENO2 mutant (eno2~–) of Arabidopsis thaliana

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Journal of Integrative Agriculture 2018年第1期17卷 94-110页

作者： ZHANG Yong-hua CHEN Chao SHI Zi-han CHENG Hui-mei BING Jie ma Xiao-feng ZHENGChao-xing LI Hong-jie ZHANG Gen-fa Beijing Key Laboratory of Gene Resource and Molecular Development/College of Life Sciences Beijing Normal University Beijing 100875 P.R.China Beijing Normal University Zhuhai 519087 P.R.China National Key facility for Crop Gene Resources and Genetic Improvement/Institute of Crop Sciences Chinese Academy of Agricultural Sciences Beijing 100081 P.R. China

Abiotic stress poses a great threat to plant growth and can lead to huge losses in yield. Gene enolase2 （EN02） is important in resistance to abiotic stress in various organisms. ENO2 T-DNA insertion mutant （enoZ） plants of Arabidopsis thaliana showed complete susceptibility to sodium chloride treatment when were analyzed either as whole plants or by measuring root growth during NaCl treatment. Quantitative real-time RT-PCR （RT-qPCR） was performed to investigate the expression profile of EN02 in response to NaCl stress in Arabidopsis. The transcript level of EN02 was rapidly elevated in 300 mmol L-1 NaCl treatment. ENO2 also responded to 300 mmol L 1 NaCl treatment at the protein level. To illuminate the mechanism underlying EN02 resistance to salt at the transcriptional level, we studied the wild-type and enoZ Arabidopsis lines that were treated with 300 mmol L 1 NaCl for 18 h using 454 GS FLX, which resulted in an expressed sequence tag （EST） dataset. A total of 961 up-regulated and 746 down-regulated differentially expressed genes （DEGs） were identified in the pairwise comparison w-r-18 h：eno2^-18 h. The DEGs were identified and functionally annotated using the databases of Gene Ontology （GO） and the Kyoto encyclopedia of genes and genomes （KEGG）. The identified unigenes were subjected to GO analysis to determine biological, molecular, and cellular functions. The biological process was enriched in a total of 20 GO terms, the cellular component was enriched in 13 GO terms, and the molecular function was enriched in 11 GO terms. Using KEGG mapping, DEGs with pathway annotations contributed to 115 pathways. The top 3 pathways based on a statistical analysis were biosynthesis of the secondary metabolites （KO01110）, plant-pathogen interactions （KO04626）, and plant hormone signal transduction （KO04075）. Based on these results, EN02 contributes to increased resistance to abiotic stress. In particular, EN02 is involved in some of the metabolic stress response pathways in

关键词： EN02 NaCI tolerance abiotic stress 454 GS FLX sequencing GO KEGG

Three-dimensional(3D) Printing Technology Assisted by Minimally Invasive Surgery for Pubic Rami Fractures

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Current Medical Science 2018年第5期38卷 827-833页

作者： Wen-bo NIE fa-gang YE Jian-lin ma Jiang-ping YU Ming-xing WANG Zhen-hua ZHANG Fu-jie SUN Department of Orthopedics Affiliated Hospital of Qingdao UniversityQingdao 266000China Department of Orthopedics Huxi Hospital Affiliated to Jining Medical College (Shanxian Central Hospital)Heze 274300China Department of Orthopedics Qingdao Chengyang District People's HospitalQingdao 266100China

The feasibility of three-dimensional (3D) printing technology cgmbined with minimally invasive surgery in the treatment of pubic rami fractures was *** August 2015 to October 2017,a series of 30 patients who underwent surgical stabilization of their anterior pelvic ring (all utilizing the 3D printing technology)by one surgeon at a single hospital were *** minimally invasive incisions were made through anterior inferior cilia spine and pubic *** collected included the operative duration,the blood loss,the damage of the important tissue,the biographic union and therecovery of the function after the *** on inlet and outlet pelvic cardiograph were made immediately post-operation and at all follow-up clinic *** scores of reduction and function were measured during *** showed that the wounds of 30 patients were healed in the first stage,and there was no injury of important structures such as blood vessels and *** to the matta criteria,excellent effectiveness was obtained in 22 cases and good in 8 *** to the functional evaluation criteria of majeed,excellent effectiveness was obtained in 21 cases and good in 9 *** was suggested that the 3D printing technology assisted by minimally invasive surgery can better evaluate the pelvic fracture before operation,which was helpful in plate modeling, and can shorten surgery duration and reduce intraoperative blood loss and complications. The positioning accuracy was improved,and better surgical result was finally achieved.

关键词： digital design three-dimensional printing anterior ring pelvic fractures minimally invasive surgery

Mixed eigenvalues of discrete p-Laplacian

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Frontiers of mathematics in China 2014年第6期9卷 1261-1292页

作者： Mu-fa CHEN Lingdi WANG Yuhui ZHANG School of mathematical Sciences Beijing Normal University Beijing 100875 China School of mathematics and Information Sciences Henan University Kaifeng 475004 China

This paper deals with the principal eigenvalue of discrete p-Laplacian on the set of nonnegative integers. Alternatively, it is studying the optimal constant of a class of weighted Hardy inequalities. The main goal is the quantitative estimates of the eigenvalue. The paper begins with the case having reflecting boundary at origin and absorbing boundary at infinity. Several variational formulas are presented in different formulation： the difference form, the single summation form, and the double summation form. As their applications, some explicit lower and upper estimates, a criterion for positivity （which was known years ago）, as well as an approximating procedure for the eigenvalue are obtained. Similarly, the dual case having absorbing boundary at origin and reflecting boundary at presented at the end of Section 2 to infinity is also studied. Two examples are illustrate the value of the investigation.

关键词： Discrete p-Laplacian mixed eigenvalue variational formula,explicit estimate positivity criterion approximating procedure