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| 1 | Asymptotic state behaviour and its modeling for saturated sand显示文摘A new double hardening elasto-plastic model is proposed in this paper based on the existing unified hardening model (UH model). By assuming that there is part coupling effect between the plastic volumetric strain and plastic shear strain, hardening parameters consisting of a coupled and an uncoupled components are adopted in this model. A unique feature of this model is that it can describe not only the conventional drained and undrained behaviors of soil, but also the stress-strain relationships of soil under partially drained conditions which can be volumetric compression or dilation. Adopting the asymptotic state concept, simple equations for estimating the limiting stress ratio under undrained or earth pressure at rest (i.e. K0) conditions are derived. The new model is relatively simple to be adopted in practice for two reasons. First, the same soil parameters as in Cam-clay model are used except the addition of one extra parameter, the stress ratio at the characteristic state. Second, all the parameters can be determined using conventional triaxial compression tests. | LUO Ting YAO YangPing CHU Jian | 2009 | Science China(Technological Sciences)2009，52，8： | 10 |
| 2 | A constitutive model for granular soils显示文摘A simple constitutive model is presented to describe the mechanical behaviors of granular soils in a large stress range. A novel normal compression line(NCL) is first expressed by introducing a limit void ratio(e_L) in the double logarithmic scale.Subsequently, a state parameter(ξ) is defined to quantify the current state of granular soils, and a unified hardening parameter(H)that is a function of the state parameter(ξ) is developed to govern the hardening process of the drop-shaped yield surface.Combining with flow rule, a constitutive model for granular soils is proposed. Finally, the comparison between the predictions and the test results of Cambria sand and Coarse-grained material indicates that the model is able to describe the mechanical behaviors of granular soils in a large stress range. | YAO YangPing LIU Lin LUO Ting | 2018 | Science China(Technological Sciences)2018，61，10： | 7 |
| 3 | Progress of Jinping Underground laboratory for Nuclear Astrophysics(JUNA)显示文摘Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to directly study for the first time a number of crucial reactions occurring at their relevant stellar energies during the evolution of hydrostatic stars. In its first phase, JUNA aims at the direct measurements of^(25)Mg(p,γ)^(26)Al,^(19)F(p,α)^(16)O,^(13)C(α,n)^(16)O and ^(12)C(α,γ)^(16)O reactions. The experimental setup,which includes an accelerator system with high stability and high intensity, a detector system, and a shielding material with low background, will be established during the above research. The current progress of JUNA will be given. | WeiPing Liu ZhiHong Li JiangJun He XiaoDong Tang Gang Lian Zhu An JianJun Chang Han Chen QingHao Chen XiongJun Chen ZhiJun Chen BaoQun Cui XianChao Du ChangBo Fu Lin Gan Bing Guo GuoZhu He Alexander Heger SuQing Hou HanXiong Huang Ning Huang BaoLu Jia LiYang Jiang Shigeru Kubono JianMin Li KuoAng Li Tao Li YunJu Li Maria Lugaro XiaoBing Luo HongYi Ma ShaoBo Ma DongMing Mei YongZhong Qian JiuChang Qin Jie Ren YangPing Shen Jun Su LiangTing Sun WanPeng Tan Isao Tanihata Shuo Wang Peng Wang YouBao Wang Qi Wu ShiWei Xu ShengQuan Yan LiTao Yang Yao Yang XiangQing Yu Qian Yue Sheng Zeng HuanYu Zhang Hui Zhang LiYong Zhang NingTao Zhang QiWei Zhang Tao Zhang XiaoPeng Zhang XueZhen Zhang ZiMing Zhang Wei Zhao Zuo Zhao Chao Zhou | 2016 | Science China(Physics,Mechanics & Astronomy)2016，59，4： | 3 |
| 4 | A symmetrisation method for non-associated unified hardening model显示文摘 | Ting Luo Zhenhua Qin Xing Feng Fei Xia Yangping Yao Daichao Sheng | 2013 | Computers and Geotechnics2013，，： | 2 |
| 5 | Development of pot-cover effect apparatus with freezing-thawing cycles显示文摘‘Pot-cover effect’ refers to the phenomenon of moisture accumulation beneath the pavement under condensation or desublimation because the vapor transfer in the soil is blocked by the pavement. To study this phenomenon in the laboratory, we have developed the pot-cover effect apparatus with freezing-thawing cycles(PEAFC), which consists of three parts, namely, the vapor transfer system, the temperature control system, and the temperature and water content monitoring system. The major functions of this apparatus include: simulation of both vapor transfer and freezing-thawing cycling in the soil, real-time monitoring of the temperature and the water content in soil samples, and one-dimensional heat and moisture transfer in the samples. The FDR(frequency domain reflectometry) sensors of the apparatus are calibrated and a calibration formula is proposed to eliminate the water content measurement errors induced by temperature changes. Constant temperature difference tests and a freezing-thawing cycling test are conducted with the apparatus. Results indicate that the apparatus can control the water replenishment in the soil samples, monitor the vapor transfer in the samples in real time, and simulate the vapor transfer process under the condition of the freezing-thawing cycling in the soil. These tests verify the effectiveness and reliability of the apparatus, which indicates that the development purpose is achieved. | LUO Ting CHEN Han YAO YangPing WANG NaiDong QU Xiao | 2019 | Science China(Technological Sciences)2019，62，9： | 2 |
| 6 | Epidemiological and clinical characteristics of burns in the older person:a seven-year retrospective analysis of 693 cases at a burn center in south-west China显示文摘Background:Burns are one of the major traumas that may affect older individuals.The purpose of this study was to investigate the epidemiological and clinical characteristics of geriatric burns at a major center in south-west China.Methods:This retrospective study was conducted at the Institute of Burn Research,Southwest Hospital of Army Medical University between 2010 and 2016,and the data collected from medical records included admission date,age,gender,premorbid disease,burn etiology,injured anatomical location,burn area and depth,inhalation injury,number of surgeries,length of stay(LOS),clinical outcome,and medical cost.Results:Of the 693 older burn patients included,60.75%were male and 56.85%were aged 60–69 years.Burns peaked in December–March and June.Flamewas the most common cause of burns,making up 51.95%of all cases,and also dominated in the burn patients aged 60–69 years.Limbs were the most common anatomical sites of burns(69.41%),and the median total body surface area(TBSA)was 5%(interquartile range[IQR]:2%–15%).The percentage of the patients who underwent surgeries and number of surgeries significantly increased in the cases of contact burns,younger age and full-thickness burns.Six deaths resulted in a mortality of 0.9%.The median LOSwas 16 days(IQR:8–29 days),and the main risk factors were more surgeries,better outcomes,and full-thickness burns.The median costwas 20,228 CNY(IQR:10,457–46,581.5 CNY),and major risk factors included longer LOS,larger TBSA,and more surgeries.Furthermore,compared to the earlier data from our center,the proportion of older adults among all burns(7.50%vs.4.15%),proportion of flame burns(51.95%vs.33.90%),and mean age(69.05 years vs.65.10 years)were significantly higher,while the proportion of premorbidities(16.9%vs.83.9%),mortality(0.9%vs.7.5%)and median TBSA(5%vs.21%)were significantly lower.Conclusions:This study suggested that closer attention should be paid to prevent burn injuries in older people aged 60–69 years,especially males,regarding incidents in the summer and winter,and flame burns.Moreover,tailored intervention strategies based on related risk factors should be under special consideration. | Wei Qian Song Wang Yangping Wang Xiaorong Zhang Mian Liu Rixing Zhan Yong Huang Weifeng He Gaoxing Luo | 2020 | Burns & Trauma2020，8，1： | 0 |
| 7 | Photometric analysis of a blue straggler eclipsing binary in the old open cluster NGC 2141显示文摘To understand the formation mechanism of blue stragglers in open clusters, we conducted a photometric analysis for a blue straggler eclipsing binary in the old open cluster NGC 2141. By using the least square fitting of times of minima, we derived the ephemeris and redetermined the orbital period of this system to be 0.6227 d. We have also done a photometric analysis for light curve with the Wilson-Devinney Code (2003). The photometric solutions reveal a semi-detached binary with the secondary component filling its Roche lobe. The photometric mass ratio M2/M1 (secondary/primary) was determined to be 0.190±0.002 and the ratio of V-band luminosity L2/L1(V) is about 0.033±0.001, which indicates the secondary component is overluminous. Thus, this blue straggler likely results from a substantial mass exchange between these two components. | LUO YangPing WANG Bo CHEN HaiLiang ZHANG XiaoBin HAN ZhanWen | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，8： | 0 |
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