期刊文献+
共找到6篇文章
< 1 >
每页显示 20 50 100
A NEW APPROACH TO ESTIMATE KINETIC DECOMPOSITION FROM TG-DTG OR DSC CURVE
1
作者 Yu Ting ZHAO Jian Hua ZHANG Tong Shan SUN Department of Chemistry,Shandong University,Jinan,250100Zhao He YANG Institute of Crystal Materials,Shandong University,Jinan,250100 《Chinese Chemical Letters》 SCIE CAS CSCD 1993年第6期521-522,共2页
This paper reports a new approach to estimate kinetic parameters for the thermal decomposition of the solid state from TG-DTG or DSC curve.Reduced equations are derived for the first tlme.The validity of these equatio... This paper reports a new approach to estimate kinetic parameters for the thermal decomposition of the solid state from TG-DTG or DSC curve.Reduced equations are derived for the first tlme.The validity of these equations was demonstrated employing data obtained from the dehydration process of calcium oxalate monohydrate. 展开更多
关键词 DTG AI RT rate DSC A new APPROACH TO estimate KINETIC DECOMPOSITION FROM TG-DTG OR DSC CURVE
下载PDF
Seismic safety assessment with non-Gaussian random processes for train-bridge coupled systems
2
作者 Zhao Han Gao Lei +4 位作者 Wei Biao Tan Jincheng Guo Peidong Jiang Lizhong Xiang Ping 《Earthquake Engineering and Engineering Vibration》 SCIE EI CSCD 2024年第1期241-260,共20页
Extensive high-speed railway(HSR)network resembled the intricate vascular system of the human body,crisscrossing mainlands.Seismic events,known for their unpredictability,pose a significant threat to both trains and b... Extensive high-speed railway(HSR)network resembled the intricate vascular system of the human body,crisscrossing mainlands.Seismic events,known for their unpredictability,pose a significant threat to both trains and bridges,given the HSR’s extended operational duration.Therefore,ensuring the running safety of train-bridge coupled(TBC)system,primarily composed of simply supported beam bridges,is paramount.Traditional methods like the Monte Carlo method fall short in analyzing this intricate system efficiently.Instead,efficient algorithm like the new point estimate method combined with moment expansion approximation(NPEM-MEA)is applied to study random responses of numerical simulation TBC systems.Validation of the NPEM-MEA’s feasibility is conducted using the Monte Carlo method.Comparative analysis confirms the accuracy and efficiency of the method,with a recommended truncation order of four to six for the NPEM-MEA.Additionally,the influences of seismic magnitude and epicentral distance are discussed based on the random dynamic responses in the TBC system.This methodology not only facilitates seismic safety assessments for TBC systems but also contributes to standard-setting for these systems under earthquake conditions. 展开更多
关键词 train-bridge coupled(TBC)system random vibration new point estimate method(NPEM) seismic safety assessment moment expansion approximation(MEA) non-Gaussian distributions
下载PDF
WAVE CURRENT FORCE COEFFICIENTS ON INCLINED CYLINDER AND A NEW ESTIMATION METHOD 被引量:2
3
作者 Teng Bin and Li Yucheng Research Assistant, Dalian University of Technology, Dalian Professor, Dalian University of Technology, Dalian 《China Ocean Engineering》 SCIE EI 1990年第3期283-296,共14页
Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current fo... Based on the review of present force coefficients estimation methods, a new method in the frequency domain, revised cross-spectrum estimation method, is presented in this paper. Some experiments on the wave-current force on inclined cylinders are also described and the wave current force coefficients are estimated by the revised cross-spectrum estimation method. From the results, it is found that the wave and current directions have some regular effect on the coefficients. According to the results, some empirical formulas are obtained for converting the wave-current force coefficients on inclined cylinders into a unified coefficient. Comparisons show that the unified coefficients are in good agreement with other results. 展开更多
关键词 WAVE CURRENT FORCE COEFFICIENTS ON INCLINED CYLINDER AND A new ESTIMATION METHOD Mean
下载PDF
Estimation Study of New Cancer Cases and Deaths in Wuwei, Hexi Corridor Region, China, 2018 被引量:2
4
作者 CAO Bo Yu LI Cheng Yun +10 位作者 XU Feng Lan LIU Xiao Qin YANG Yan Xu LI Jing GAO Cai Yun RONG You Ming LI Rong Cheng LI Ya Li ZHENG Shan BAI Ya Na YE Yan Cheng 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 2017年第11期829-833,共5页
Population-based cancer registration data were collected to estimate the cancer incidence and mortality in Wuwei, Hexi Corridor Region, China in 2018. We used the 2011-2013 data to predict the number of new cases and ... Population-based cancer registration data were collected to estimate the cancer incidence and mortality in Wuwei, Hexi Corridor Region, China in 2018. We used the 2011-2013 data to predict the number of new cases and deaths in 2018 and the 2003-2013 data to analyze trends in cancer incidence and mortality. The goal is to enable cancer prevention and control directions. Our results indicated that stomach cancer is the most common cancer. For all cancers combined, the incidence and mortality rates showed significantly increasing trends(+2.63% per year; P 〈 0.05 and +1.9% per year; P 〈 0.05). This study revealed a significant cancer burden among the population of this area. Cancer screening and prevention should be performed after an epidemiological study of the cause of the cancer is completed. 展开更多
关键词 Estimation Study of new Cancer Hexi Corridor Region
下载PDF
New Scheme for Estimating the Free Energy of Crystallization of Amorphous Alloys
5
作者 舒小林 张邦维 +1 位作者 张恒 谭肇升 《Rare Metals》 SCIE EI CAS CSCD 1992年第2期143-144,共2页
关键词 Free new Scheme for Estimating the Free Energy of Crystallization of Amorphous Alloys
下载PDF
The depletion of nutrients and the estimation of the new production in the ice-edge of the Prydz Bay,Antarctica
6
作者 陈志强 王玉衡 刘际弟 《Chinese Journal of Polar Science》 1998年第2期63-70,共8页
The distributions and changes of nutrients in the Prydz Bay were investigated during CHINARE 6(the 6th Chinese National Antarctic Research Expedition) and CHINARE 9, and the new productions were estimated by using m... The distributions and changes of nutrients in the Prydz Bay were investigated during CHINARE 6(the 6th Chinese National Antarctic Research Expedition) and CHINARE 9, and the new productions were estimated by using mass balance method. The results showed that in CHINARE 6, the depletion of NO 3 N, PO 4 P, SiO 3 Si were 1064.8, 69.2, 2196.9 mmol/m 2 ,respectively, the uptake ratios of N and Si to P were 15.3, 31.7, respectively, and new production was 992.4 mgC/(m 2·d) ; in CHINARE 9, the depletion of NO 3 N, PO 4 P were 551.9 , 41.2 mmol/m 2 , respectively, the uptake ratio of N to P was 13.4,and the new production was 390.1 mgC/(m 2·d) , indicating significant annual and/or seasonal variation. New productions were both greater than the primary production determined by 14 C trace method, demonstrating there existed rather higher new production in the Prydz Bay in austral summer. The uptake ratio of nutrients in the Prydz Bay, however, is different from the previous values obtained from the open sea, showing the regional difference of uptake and regeneration of nutrients in the Southern Ocean. Finally the annual change of new production and the characteristics of phytoplankton production were discussed. 展开更多
关键词 depletion of nutrient estimation of the new production Prydz Bay.
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部