Science Discovery最新文献_第8页

Design and Implementation of Auto-calibration Ozone Concentration Analyzer with Double Optical Cells 双光学单元臭氧浓度自动校准分析仪的设计与实现

Science Discovery Pub Date : 2021-07-09 DOI: 10.11648/J.SD.20210904.20

Wu Juan, Chih-Lin Ying, F. Fang, Song Ting Shan

引用次数: 0

Experimental Study on Seismic Behavior of RC Frame Beam Column Joints 钢筋混凝土框架梁柱节点抗震性能试验研究

Science Discovery Pub Date : 2021-06-22 DOI: 10.11648/J.SD.20210904.19

Shen Zhaoyi, Gong Maosheng, Zuo Zhanxuan, Zhang Hao

{"title":"Experimental Study on Seismic Behavior of RC Frame Beam Column Joints","authors":"Shen Zhaoyi, Gong Maosheng, Zuo Zhanxuan, Zhang Hao","doi":"10.11648/J.SD.20210904.19","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.19","url":null,"abstract":"Strong columns and weak beams and \"strong joints and weak members\" are important concepts in the design of reinforced concrete ductile frame structures. However, many earthquake damages show that a large number of reinforced concrete frame structures still do not guarantee the realization of the above seismic concepts. In order to solve this problem, this paper designs and manufactures a beam column joint with plate, which includes the bottom column base and the moment increasing coefficient of the column end is 1.2. Through the quasi-static reciprocating loading test, the influence of the bearing capacity, ultimate deformation, stiffness degradation and hysteretic energy consumption of the specimen is investigated. The test results show that when the moment increasing factor at the end of the column is 1.2, the failure order of the specimen is bottom column base beam slab bottom column base, the plastic hinge occurs at the bottom of the column, and the position of the column in the beam column joint is not damaged; According to the seismic code, the overall failure mode of the beam column joints with slab and infilled wall at the bottom column base can be \"strong column and weak beam\" and \"strong joint and weak member\" under the action of reciprocating quasi-static loading.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73842435","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preliminary Analysis of Contamination in Liver Preservation Solution and Prophylaxis for Post-transplant Infection 肝保存液污染的初步分析及移植后感染的预防

Science Discovery Pub Date : 2021-06-09 DOI: 10.11648/J.SD.20210904.17

Zhao Jiqiang, Zhao Jiquan, H. Feng, Wang Shaping, Zheng Yujian

{"title":"Preliminary Analysis of Contamination in Liver Preservation Solution and Prophylaxis for Post-transplant Infection","authors":"Zhao Jiqiang, Zhao Jiquan, H. Feng, Wang Shaping, Zheng Yujian","doi":"10.11648/J.SD.20210904.17","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.17","url":null,"abstract":"Objective To discuss the preservation solution (PS) contamination and initial experience of liver transplantation from organ donation by citizens after death and initial experience. Methods The 78 liver transplant recipients were divided into positive group and negative group based on the finding of the culture of PS. The positive group received the sequential therapy of antibiotics with ertapenem and imipenem for one week, and the negative group stopped using imipenem. The situation of PS contamination and infection after liver transplantation and prognosis during the follow-up 3 months of the recipients were analyzed. Results PS culture positive rate was 41.03%, and 33 strains of pathogens were isolated. The most common pathogenic bacteria were gram-negative bacilli (9 strains, 27.27%) and coagulase –negative staphylococci (9 strains, 27.27%). The infection rate after liver transplantation was 31.25% and 13.04%, respectively, in positive group and negative group (χ2=3.837, P=0.048). The most frequent infection sites were lower respiratory tract (5 cases, 31.25%), abdominal cavity (5 cases, 31.25%) and surgical incision (4 cases, 25.00%). There was no significant difference in postoperative infection rate among patients with different CTP, MELD and surgical methods (P>0.05). One case (1.28%) was infected with the same pathogenic bacteria as PS contamination 3 weeks after liver transplantation, and died of multiple organ failure. There was no significantly difference in the acute rejection rate (1,3.13% and 2, 4.35%) and mortality (2,6.25% and 5,10.87%) between the two groups (P>0.05). Conclusion Contamination of the PS is frequent in liver transplantation, and it is the risk factor for postoperative infection of recipients. Early targeted antimicrobial treatment against pathogens cultured from PS play a positive role in reducing the contamination-associated infection rate after liver transplantation.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78183974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Influence of Axial Compression Ratio on the Seismic Behavior of RC Frame Column 轴压比对RC框架柱抗震性能的影响

Science Discovery Pub Date : 2021-06-09 DOI: 10.11648/J.SD.20210904.18

Liu Yang, Gong Maosheng, Zuo Zhanxuan

{"title":"The Influence of Axial Compression Ratio on the Seismic Behavior of RC Frame Column","authors":"Liu Yang, Gong Maosheng, Zuo Zhanxuan","doi":"10.11648/J.SD.20210904.18","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.18","url":null,"abstract":"In order to analyze the quantitative influence of the axial compression ratio on the seismic performance of reinforced concrete (RC) frame column, this paper carried out the numerical analysis of the quasi-static simulation of a RC frame column and analyzed its hysteresis performance, bearing capacity, stiffness degradation, energy consumption capacity and ductility capacity under different axial compression ratios, based on OpenSees finite element software, considering the buckling and fatigue damage model. The results show that the smaller the axial compression ratio, the fuller the hysteresis curve and the slower the stiffness degradation of the column. The ultimate bearing capacity of the column increases by 24.6% when the axial compression ratio increases from 0.3 to 0.8, but bearing capacity decreasing and stiffness degradation is faster and faster. When the deformation does not exceed the ultimate displacement, the equivalent viscous damping at each displacement level of high axial compression ratio column is greater than that of the low axial compression ratio, but the total hysteretic energy decreases about 64.2% at maximum amplitude. The ultimate displacement gradually decreases with the increase in the axial compression ratio, and the ductility factor decreases about 55.9% at maximum amplitude. The results can be referenced by the seismic design and analysis of RC frame.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"1954 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91248632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Effect Observation of Lianhua Qingwen Granule in the Adjuvant Treatment of Community Acquired Pneumonia (CAP) 连花清瘟颗粒辅助治疗社区获得性肺炎的疗效观察

Science Discovery Pub Date : 2021-06-04 DOI: 10.11648/J.SD.20210904.15

Xiao Jianzhen, Shi Tongxia, Cao Wenli

{"title":"The Effect Observation of Lianhua Qingwen Granule in the Adjuvant Treatment of Community Acquired Pneumonia (CAP)","authors":"Xiao Jianzhen, Shi Tongxia, Cao Wenli","doi":"10.11648/J.SD.20210904.15","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.15","url":null,"abstract":"Objective To observe the efficacy of Lianhua Qingwen Granule in the adjuvant treatment of community-acquired pneumonia (CAP). Methods From March 2018 to January 2020, adult patients with CAP who visited the internal medicine clinic of community health service center of Minzu University of China were divided by a random code list into two groups: the observation group (31cases), Lianhua Qingwen Granule orally combined with Levofloxacin intravenous drop, The control group (31 cases), Levofloxacin intravenous drop alonely. The cough symptom score, the cough visual simulation score (VAS), antipyretic time and X-ray chest shadow absorption were compared between the two groups to judge the curative effect. Measurement data were expressed as mean±standard deviation, and comparison used independent sample t test. Enumeration data were expressed as percentages, total effective rates were compared by χ2 tests. Results There were no statistically significant differences in baseline data, such as age, score of cough symptom before treatment between the two groups. Compared with the control group, cough symptom score and VAS of observation group decreased significantly [(2.45±1.312) point vs (3.61±1.476) point, P=0.002], [(3.68±1.973) point vs (4.84±1.753) point, P=0.017], antipyretic time was decreased significantly [(3.00 ±1.4814) day VS (4.842±1.5728) day, P=0.001], effective rate was increased significantly (87.1% VS 64.5%, P=0.038). Compliance: the rate of hospital transfer without medical advice was decreased significantly (6.45% VS 29.03% P=0.046). Conclusion Lianhua Qingwen Granule combined with levofloxacin has good efficacy and compliance in the treatment of CAP, and community doctors can choose it.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85656069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of HMB on Phase Angle of Maintenance Hemodialysis Patients HMB对维持性血液透析患者相位角的影响

Science Discovery Pub Date : 2021-06-04 DOI: 10.11648/J.SD.20210904.14

Liang Qingyue, W. Zhong, Zong Xueping, Diao Yanqing, Cai Ping, Ling Honglie, H. Liping

{"title":"Effect of HMB on Phase Angle of Maintenance Hemodialysis Patients","authors":"Liang Qingyue, W. Zhong, Zong Xueping, Diao Yanqing, Cai Ping, Ling Honglie, H. Liping","doi":"10.11648/J.SD.20210904.14","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.14","url":null,"abstract":"Objective To observe and evaluate the effect of β- hydroxy-β- methylbutyric acid (HMB) on phase angle (PA) in maintenance hemodialysis (MHD) patients. Methods From March 2018 to August 2019, 64 patients who received maintenance hemodialysis, at Chengdu Fifth People's Hospital, were selected as subjects, and they were divided into experimental group and control group with single center, random, single dose, single blind control design, and 32 patients in each group. HMB intervention was performed in the trial group and placebo in the control group for 12 weeks. Human component analysis (Inbody S770) was performed before and after intervention in the two groups to observe the change of phase angle. Scored Patient-Generated Subjective Global Assessment (SGA) and Malnutrition Inflammatory Score (MIS) were used to assess the nutritional status of MHD patients before and after group entry, to observe the correlation of its numerical change and the phase angle. Results The PA, SGA, MIS of the experimental group was significantly higher (p<0.05) than that of the control group (p<0.05), and the test group increased better than the control group (p<0.05). Positive correlation between PA and SGA, MIS (p<0.05). Conclusions By giving patients complementary HMB, to improve patient nutritional status, to improve the patient phase angle, and improve the patient prognosis.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84628533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on Clock Circuit Electromagnetic Emission Test and Suppression 时钟电路电磁发射测试与抑制研究

Science Discovery Pub Date : 2021-06-04 DOI: 10.11648/J.SD.20210904.13

Ba Yijie, Wu Shengnan

引用次数: 0

Research on the Power Tracking Control of Permanent Manget Synchronous Wind Turbine with Losses Considered 考虑损耗的永磁板同步风力发电机组功率跟踪控制研究

Science Discovery Pub Date : 2021-06-04 DOI: 10.11648/J.SD.20210904.16

L. Fei, Gao Shujing, Ren Minmin

{"title":"Research on the Power Tracking Control of Permanent Manget Synchronous Wind Turbine with Losses Considered","authors":"L. Fei, Gao Shujing, Ren Minmin","doi":"10.11648/J.SD.20210904.16","DOIUrl":"https://doi.org/10.11648/J.SD.20210904.16","url":null,"abstract":"For the permanent magnet synchronous wind generator, a control method based on losses minimization is proposed, in order to solve the problem of the maximum wind energy tracking control, which often neglects the generator losses caused by the deviation between the actual working point and the optimal power point, and leads to the output power loss. Then, considering the loss of generator, the small-signal method is used to establish the transfer functions of the main components, such as the wind turbine, transmission chains, permanent magnet synchronous generator and so on. The zeros and poles of the transfer functions and their related stability are analyzed. The PI controllers of the current loop and power loop are designed, and the calculation method of control parameters is given. The simulation results verify the effectiveness of the proposed method, and show that the maximum wind energy tracking mode based on the loss minimization control (LMC) can reduce the controllable losses of the generator. Finally, compared with the id=0 control and the maximum torque per ampere control (MTPA), the method improves the maximum power tracking performance and increases the power output.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82818202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Overview on Equipment of Distributed Proton Exchange Membrane Fuel Cell 分布式质子交换膜燃料电池设备综述

Science Discovery Pub Date : 2021-05-24 DOI: 10.11648/J.SD.20210903.13

Zhai Junxiang, G. He, Congmin Liu, Xu Zhuang, Zhonghui Tian

{"title":"Overview on Equipment of Distributed Proton Exchange Membrane Fuel Cell","authors":"Zhai Junxiang, G. He, Congmin Liu, Xu Zhuang, Zhonghui Tian","doi":"10.11648/J.SD.20210903.13","DOIUrl":"https://doi.org/10.11648/J.SD.20210903.13","url":null,"abstract":"Distributed proton exchange membrane fuel cell (PEMFC) is one of choices for distributed power equipment, which is efficient, eco-friendly, reliable and responsive. They can be used in different occasions such as house, communication stations and chemical industry. This paper introduces combined heat and power (CHP), backup power and stationary power station, and details their system structure, technical specification and sales distribution. CHP are mainly applied in Japan and Europe, especially in Japan. PEMFC backup power is mainly carried out by large network and communication companies, which are about total 900 units in global, and the actual examples of PEMFC power station are lesser. Through the analysis of representative cases, this paper sums the actual operation and fault cause of distributed PEMFC equipment. Research will be better developed based on this analysis. Meanwhile, this paper sums these distributed power equipment from view of economy. Finally, application of domestic distributed PEMFC is pointed out. Generally speaking, distributed PEMFC receives less attention in our country. However, there are multitudinous chemical industries and so hydrogen in by-product is abundant. As PEMFC technology matures and cost falls, PEMFC power station is a suitable mode for our country based on comprehensive utilization of resources.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"43 1","pages":"101"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84743018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation Study on Blast Resistance Test of Blast Wall Based on LS-DYNA Coupling Method 基于LS-DYNA耦合法的爆破壁爆破阻力试验模拟研究

Science Discovery Pub Date : 2021-05-24 DOI: 10.11648/J.SD.20210903.16

Zhu Gan, Ding Jianguo

{"title":"Simulation Study on Blast Resistance Test of Blast Wall Based on LS-DYNA Coupling Method","authors":"Zhu Gan, Ding Jianguo","doi":"10.11648/J.SD.20210903.16","DOIUrl":"https://doi.org/10.11648/J.SD.20210903.16","url":null,"abstract":"In order to study the pressure change with time at the blast face of the blast resistant wall when the shock wave acts on the blast resistant wall after the explosion of TNT explosive, the equivalent model of the blast resistant wall is designed based on the similarity theory, and the TNT near ground explosion test is carried out. During the test, the pressure change data of the design measuring point on the blast resistant wall with time are collected by high-speed data acquisition instrument and pressure sensor, The time history curve of shock wave overpressure was obtained by processing the data. Then, LS-DYNA finite element analysis software is used to establish a separate finite element model of the blast wall. At the same time, the relevant parameters of air, explosive, concrete and ground in the explosion field are set. The numerical simulation of the explosion field is carried out, and the overpressure time history curve at the measuring point is extracted by the finite element analysis post-processing software. Compared with the numerical simulation results, it is found that the numerical simulation results are in good agreement with the experimental data, which indicates that the selection and setting of parameters in the simulation calculation are reasonable. The model and algorithm provide an effective means for the numerical simulation of blast wall in the explosion field.","PeriodicalId":21652,"journal":{"name":"Science Discovery","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85954373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0