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Copyright of Nonferrous Metals (Extractive Metallurgy) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This paper reviews the development process of standards related to the storage of hazardous chemicals in China and examines the modernization of safety infrastructure in university depots. It proposes a framework for safety facility configuration based on three aspects: hydroelectric and lighting equipment, monitoring system, and ventilation system. The chemicals are categorized into four types of depots: conventional, precursor, potential explosive, and highly toxic. For each category, specific safety configuration plans are suggested to enhance the construction and management of safety facilities in domestic university chemical depots. [ABSTRACT FROM AUTHOR]

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Pulp & Paper is the property of China Pulp & Paper Magazines Publisher and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Feed Industry is the property of Liaoning Provincial Institute of Agricultural Mechanization and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Wildlife / Yesheng Dongwu Xuebao is the property of Chinese Journal of Wildlife Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Urban Architecture & Development is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

目的 以数字减影血管造影（digital subtraction a ngiography，DSA）为金标准，利用Meta分析方法评价 并间接比较增强磁共振血管成像（contrast enhanced magnetic resonance angiography，CE-MRA）与三维 时间飞跃法磁共振血管成像（three dimensional time of flight magnetic resonance angiography，3D-TOF MRA）诊断椎基底动脉狭窄的价值。 方法 计算机检索PubMed、Embase、Web of Science、The Cochrane Library、CNKI、CBM、万方Data中关于 CE-MRA、3D-TOF MRA诊断椎基底动脉狭窄的相关文献，检索日期截止至2017年5月。2名研究者按照 纳入排除标准独立筛选文献、提取资料，使用QUADAS 2工具对所获文献进行质量评价。使用Stata 12.1软件分别合并分析CE-MRA、3D-TOF MRA对椎基底动脉狭窄的敏感度（sensitivity，Sen合并）、特异 度（specificity，Spe合并）、阳性似然比（positive likelihood ratio，+LR）、阴性似然比（negative likelihood ratio，-LR）、诊断比值比（diagnostic odds ratio，DOR）并绘制受试者工作特征曲线（summary receiver operating characteristic curve，SROC）计算曲线下面积（area under curve，AUC），利用相对比值间接比 较二者诊断价值。 结果 纳入检索所获1418条记录中的10项研究，共13组数据。Meta分析结果显示，对于狭窄程度＞ 50%的椎基底动脉，CE-MRA与3D-TOF MRA的Sen合并、Spe合并、+LR、-LR、DOR、AUC值分别为0.89[95% 可信区间（confidence interval，CI）0.75～0.95]、0.98（95%CI 0.91～0.99）、36.1（95%CI 10.3～126.2）、 0.12（95%CI 0.05～0.27）、307（95%CI 102～922）、0.97（95%CI 0.96～0.98）与0.94（95%CI 0.86～0.98）、0.93（95%CI 0.87～0.97）、14.4（95%CI 7.1～29.1）、0.06（95%CI 0.03～0.15）、226 （95%CI 57～902）、0.98（95%CI 0.96～0.99）。CE-MRA与3D-TOF MRA间接比较结果RDOR为1.36 （95%CI 0.23～7.94）。 结论 在诊断椎基底动脉狭窄方面，CE-MRA相较于3D-TOF MRA具有更高的诊断准确性。 Abstract: Objective Taking digital subtraction angiography (DSA) as the golden standard, the diagnostic value of contrast enhanced magnetic resonance angiography (CE-MRA) and three dimensional time of flight magnetic resonance angiography (3D-TOF MRA) were indirectly compared by Metaanalysis on vertebrobasilar artery stenosis. Methods PubMed, Web of Science, Embase, the Cochrane Library, CNKI, CBM and WanFang Data databases were searched for studies about CE-MRA and 3D-TOF MRA in the diagnosis of fracture of vertebrobasilar artery stenosis from inception to MAY, 2017. Two reviewers independently screened literatures according to inclusion and exclusion criteria, extracted data, and assessed the risk of bias of included studies by using the QUADAS-2. Stata 12.1 software was used to pooled sensitivity (Sen), specificity (Spe), positive likelihood ratio (+LR), negative likelihood ratio (-LR) and diagnostic odds ratio (DOR). Then the summary receiver operating characteristic curve (SROC) was drawn; the area under curve (AUC) was calculated. The results of indirect comparison were compared by relative ratio. Results There were 10 studies out of 1418 records. The results of meta-analysis showed that the pooled Sen, Spe, +LR, -LR, DOR and AUC of CE-MRA and 3D-TOF MRA for vertebrobasilar artery which stenosis more than 50% were 0.89 [95% confidence interval (CI) 0.75-0.95], 0.98 (95%CI 0.91- 0.99), 36.1 (95%CI 10.3-126.2), 0.12 (95%CI 0.05-0.27), 307 (95%CI 102-922), 0.97 (95%CI 0.96- 0.98), and 0.94 (95%CI 0.86-0.98), 0.93 (95%CI 0.87-0.97), 14.4 (95%CI 7.1-29.1), 0.06 (95%CI 0.03-0.15), 226 (95%CI 57-902), and 0.98 (95%CI 0.96-0.99), respectively. The result of indirect comparison were 1.36 (95%CI 0.23-7.94). Conclusion CE-MRA could be more accurate than 3D-TOF-MRA on the diagnosis of vertebrobasilar artery stenosis.assessed the risk of bias of included studies by using the QUADAS-2. Stata 12.1 software was used to pooled sensitivity (Sen), specificity (Spe), positive likelihood ratio (+LR), negative likelihood ratio (-LR) and diagnostic odds ratio (DOR). Then the summary receiver operating characteristic curve (SROC) was drawn; the area under curve (AUC) was calculated. The results of indirect comparison were compared by relative ratio. Results There were 10 studies out of 1418 records. The results of meta-analysis showed that the pooled Sen, Spe, +LR, -LR, DOR and AUC of CE-MRA and 3D-TOF MRA for vertebrobasilar artery which stenosis more than 50% were 0.89 [95% confidence interval (CI) 0.75-0.95], 0.98 (95%CI 0.91- 0.99), 36.1 (95%CI 10.3-126.2), 0.12 (95%CI 0.05-0.27), 307 (95%CI 102-922), 0.97 (95%CI 0.96- 0.98), and 0.94 (95%CI 0.86-0.98), 0.93 (95%CI 0.87-0.97), 14.4 (95%CI 7.1-29.1), 0.06 (95%CI 0.03-0.15), 226 (95%CI 57-902), and 0.98 (95%CI 0.96-0.99), respectively. The result of indirect comparison were 1.36 (95%CI 0.23-7.94). Conclusion CE-MRA could be more accurate than 3D-TOF-MRA on the diagnosis of vertebrobasilar artery stenosis.

Copyright of Xinjiang Agricultural Sciences is the property of Xinjiang Agricultural Sciences Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective Depression is common in patients with primary biliary cholangitis （PBC）， but the role of depression in disease progression remains unclear. This study aims to investigate the association between depression and treatment response and the impact of depression on liver cirrhosis in PBC patients. Methods A retrospective analysis was performed for the clinical data of 141 patients with PBC who attended the outpatient service of autoimmune liver diseases in General Hospital of Tianjin Medical University from January 2018 to December 2020 and received standard ursodeoxycholic acid （UDCA） monotherapy for 1 year, and 170 healthy controls, matched for age and sex, who underwent physical examination in Physical Examination Center were enrolled as healthy control group. Patient Health Questionnaire-9（PHQ-9） was used to evaluate depressive state in the patients with PBC and the healthy controls. The independent-samples t test was used for comparison of normally distributed continuous data between two groups, and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups the chi-square test was used for comparison of categorical data between two groups. The binary logistic regression model and the decision tree model were used to analyze the influencing factors for liver cirrhosis in patients with PBC, as well as the influence of depression and the HLA-DRB1 gene on liver cirrhosis. The receiver operating characteristic （ROC） curve, the area under the ROC curve （AUC), and goodness of fit were used to evaluate model performance. All 13 variables were used to establish a classification and regression tree （CART） model， i.e.， age, sex, PHQ-9 score, the DRB1* 03∶01 gene, and the serum levels of alanine aminotransferase， aspartate aminotransferase， alkaline phosphatase （ALP）， gamma-glutamyl transpeptidase （GGT）， total bilirubin， immunoglobulin G, immunoglobulin M （IgM), C3, and C4. The indications including AUC， sensitivity， and specificity were used to evaluate the performance of CART model in the model cohort. Results Compared with the normal control group， the PBC group had a significantly higher proportion of the patients with depression （53.9% vs 15.3%，χ2 =57.836，P<0.001）. Compared with the PBC patients without depression， the PBC patients with depression had a significantly poorer response to UDCA treatment （χ2 =7.549，P=0.006） and significant increases in the serum levels of ALP （Z=−2.157，P=0.031）， GGT （Z=−2.180，P=0.029）， and IgM （Z=−2.000，P=0.046）. Compared with the PBC patients without depression，the PBC patients carrying the HLA-DRB1* 03∶01 allele had a significant increase in the risk of liver cirrhosis （P<0.001）. The binary logistic regression model analysis showed that PHQ-9 score （OR=1.148，95%CI： 1.050 — 1.255，P=0.002）， the HLA-DRB1* 03∶01 gene （OR=5.150，95%CI：1.362 — 19.478，P=0.016）， age （OR=1.057， 95%CI：1.009—1.106，P=0.018), and serum ALP level （OR=1.009，95%CI：1.001—1.017，P=0.020） were independent risk factors for liver cirrhosis in patients with PBC. The decision tree analysis showed that PHQ-9 score ≥3.5 was also a risk factor for liver cirrhosis in PBC patients. Conclusion Depression is associated with poor treatment response in patients with PBC， and it is an independent risk factor for liver cirrhosis in patients with PBC. This study highlights the important clinical significance of the identification and early management of depressive state in patients with PBC. [ABSTRACT FROM AUTHOR]

Copyright of Computer Measurement & Control is the property of Magazine Agency of Computer Measurement & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tsinghua Journal of Education is the property of Tsinghua University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Peking University Education Review is the property of Peking University Education Review Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Fly Ash Comprehensive Utilization is the property of Hebei Fly Ash Comprehensive Utilization Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Jilin University (Science Edition) / Jilin Daxue Xuebao (Lixue Ban) is the property of Zhongguo Xue shu qi Kan (Guang Pan Ban) Dian zi Za zhi She and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Isotopes is the property of Journal of Isotopes Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Clean Coal Technology is the property of Clean Coal Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electroplating & Finishing is the property of Electroplating & Finishing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Isotopes is the property of Journal of Isotopes Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Contemporary Pediatrics is the property of Xiangya Medical Periodical Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Polymer Materials Science & Engineering is the property of Sichuan University, Polymer Research Institute and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective Adding hydrogen into the natural gas pipeline network will change the composition and physical parameters of the gas, cause the operating point of the centrifugal compressor to shift, and affect the inlet and outlet pressure, power and energy consumption of the compressor. Therefore, it is necessary to analyze the adaptability of the operating conditions of the hydrogen-blending transport compressor. Methods Taking the first-line West-East gas pipeline as the research object and considering the influence of hydrogen blending on the physical properties of natural gas, a calculation model of the centrifugal compressor characteristics of hydrogen-blended natural gas based on the similar conversion method was established. Furthermore, the simulation model of the hydrogen-blended natural gas pipeline with hydrogen admixture of 0%-20% was analyzed; the variation law of the pressure, temperature, operating point and performance parameters of the centrifugal compressor along the pipeline was analyzed before and after hydrogen blending under the same transmission capacity and the same calorific value. Results For the same transmission conditions, when the transmission volume was (28-45) ×106 m³/d and the hydrogen admixture was 0%-20%, the increase of hydrogen admixture by every 5% would cause the inlet pressure, outlet pressure and pressure head of the typical R-R compressor increase by 3.34%, 1.60% and 0.39% on average, respectively. It would also lead to the reduction of the self-consumption gas, power, and pressure ratio of the compressor by 0.35%, 4.11% and 1.64% on average, respectively. For the same calorific value, when the transmission volume was (28-35) ×106 m³/d and the hydrogen admixture was 0%-20%, the increase of hydrogen admixture by every 5% would cause the inlet pressure, outlet pressure, consumable gas and power of typical R-R compressors increase 7.31%, 5.37%, 4.78% and 0.84% on average, respectively. It would also lead the head and pressure ratio decrease by 0.11% and 1.72% on average, respectively. Conclusion The first-line pipeline compressor of the West-East gas pipeline is suitable for hydrogen-mixed transmission conditions. [ABSTRACT FROM AUTHOR]

Copyright of Special Oil & Gas Reservoirs is the property of Special Oil & Gas Reservoirs Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Zhejiang Electric Power is the property of Zhejiang Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas & Oil is the property of Editorial Department of Natural Gas & Oil and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Computer Engineering & Applications is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective This paper introduces a method for determining the calorific value of natural gas by using the correlation of sound velocity and visible light spectrum, so that domestic natural gas quality detection and energy measurement workers and enterprises can more effectively carry out the research and standardization of this method, and provide more diversified choices for the determination methods of calorific value of natural gas. Methods Based on the comparative analysis of the advantages and disadvantages of various natural gas calorific value determination methods and related standards, the method principle of using sound velocity and visible light spectrum correlation to determine the calorific value of natural gas is introduced, and the calorific value data of a group of gas reference materials determined by gas chromatography and the introduced correlation method are analyzed. Results The measured value of calorific value of natural gas determined by the correlation between sound velocity and visible light spectrum is in good agreement with the calculated value according to GB/T 11062-2020 Natural gas-Calculation of calorific values, density, relative density and Wobbe indices from composition. For six binary gas reference materials simulating natural gas, the relative deviation is between 0.08%-0.42%; For five kinds of multi-component （up to 14 components） gas reference materials simulating natural gas, the relative deviation is-0.45%-0.07%. Conclusions The feasibility of measuring the calorific value of natural gas by using the correlation between sound velocity and visible light spectrum is preliminarily verified. This method has the characteristics and advantages that multiple data can be obtained within 1 s, synchronized with flow measurement, and the measurement is not limited by gas components and not effected by H2. It is suggested to further carry out the research on accuracy, measurement range, precision and field application, and timely establish standard methods, level 0 test devices of calorific value direct combustion, gas compression factor, density and other test devices. [ABSTRACT FROM AUTHOR]

Copyright of Natural Gas & Oil is the property of Editorial Department of Natural Gas & Oil and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Science Technology & Engineering is the property of Chinese Society of Technology Economics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shandong Medical Journal is the property of Shandong Medical Health Newspapers and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At present, there are still some problems such as heavy workload and low efficiency in the design process of lever loading system at aircraft structure test in China. Aiming at the actual needs of enterprises, the parameterized and rapid lever loading design system is developed based on the CATIA software platform in this paper. Firstly, the loading points on aircraft shape are calculated based on the distributed digital model of the whole aircraft in general. Secondly, the topological structure diagram of the lever loading system is generated by using the clustering algorithm. Finally, parametric modeling of levers, connectors, etc. is realized and automatic assembly is completed. The example shows that the method proposed in this paper can facilitate the rapid modeling of the lever loading system. [ABSTRACT FROM AUTHOR]

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of East China University of Science & Technology is the property of Journal of East China University of Science & Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)