|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Tests and analysis of mechanical behaviours of rock bolt componentsfor China's coal mine roadways显示文摘A series of laboratory tests were performed to study the mechanical behaviours of newly developed high strength rock bolt components, including rebar, thread, plate, and domed washer. The characteristics of deformation and damage of each component were presented. The stress distribution of plate and domed washer was investigated through fi nite element modelling. The numerical results show that the yield and tensile strengths of the developed high strength rebar are 33.6%e58.3% and 17.2%e28.7% greater than those of the conventional rebar, respectively. The increase in yield strength was higher than that in tensile strength, suggesting an increase in yield to tensile strength ratio and a decrease in elongation. It is well-known that the thread processing may not be of high precision and accuracy as expected, which is characterised as rough thread surface, non-identical tooth height, toe stripping, and cracks in the surface.Hardening during thread processing tends to increase the thread yield and tensile strengths. In this paper, the typical deformation process of arch-shaped plate is classi fi ed into fi ve stages. The tested plates exhibited distinct deformation characteristics and bearing capacities due to variations in shape, size,material and presence of washer. It was observed that uneven bottom surface, low bearing arch and large radius of the transitional arc connecting bearing arch and bottom surface were the major reasons accounting for low load-bearing capacity of plates. The performance of domed washer has a close relation with the shape, size, strength, and deformation compatibility with plate. Stress concentration was observed on the periphery of the contact surface between domed washer and plate, which is signi fi cantly in fl uenced by the strength of domed washer and is considered to be 20%e30% higher than that of plate.Finally, a case study in the Datong coal mining district was presented, and the support pattern and effect of the developed rock bolt were described. | Hongpu Kang | 2015 | 岩石力学与工程学报2015，34，1： | 7 |
| 2 | A mathematical model to describe the diurnal pattern of enteric methane emissions from non-lactating dairy cows post-feeding显示文摘Enteric methane emission is not only a source of energy loss in ruminants, but also a potent contributor to greenhouse gas production. To identify the nature and timing of interventions to reduce methane emissions requires knowledge of temporal kinetics of methane emissions during animal husbandry.Accordingly, a mathematical model was developed to investigate the pattern of enteric methane emissions after feeding in dairy cows. The model facilitated estimation of total enteric methane emissions(V,g) produced by the residual substrate(V1, g) and newly ingested feed(V2, g). The model was fitted to the10 h methane emission patterns after morning feeding of 16 non-lactating dairy cows with various body weights(BW), and the obtained parameters were used to predict the kinetics of 24 h methane emission for each animal. The rate of methane emission(g/h) reached a maximum within 1 to 2 h after feeding,followed by a gradual post-prandial decline to a basal value before the next feeding. The model satisfactorily fitted curves for each cow according to the criterion of goodness-of-fit, and provided biological descriptions for fluctuations in methane emissions based on basal V1 and feeding V2 in response to the changes in BW and dry matter intake(DMI) of different dairy cows. The basal V1 and feeding V2 are probably maintained by slow-and readily-degradable substrates, respectively. The former contributed at least 0.6 of methane production. In summary, the model provides a means to separate basal V1 and feeding V2 within V, and can be used to predict 24 h emission from a single feeding period. | Min Wang Rong Wang Xuezhao Sun Liang Chen Shaoxun Tang Chuangshe Zhou Xuefeng Han Jinghe Kang Zhiliang Tan Zhixiong He | 2015 | Animal Nutrition2015，，4： | 2 |
| 3 | Nanomechanical behaviors of (110) and (111) CdZnTe crystals investigated by nanoindentation显示文摘The nanomechanical behaviors of (110) and (111) CdZnTe crystals were investigated by nanoindentation. It was found that the indenter tip was adhered by the removed materials in scanning testing area although the scanning force on the tested surface was very small (1000 nN), which would affect the testing result of nanoindentation, so the indenter was clean before nanoindentation test. The experimemtal results showed that the hardness and Young's modulus decreased with the increase of indentation loads on the same plane. Because of the anisotropy of the CdZnTe crystal,the average hardness of (110) plane is 35% lower than that of (111) plane, and there are about 30% difference of the hardness along different crystallographic directions on the same plane. The hardness in 0° and 120° testing directions was the same due to the threefold symmetry of a Berkovich indenter. And the anisotropy affected the surface quality during machining of CdZnTe crystal. | LI Yan KANG Renke GAO Hang WANG Jinghe LANG Yanjua | 2009 | Rare Metals2009，28，6： | 2 |
| 4 | LAMC1, LAMA2 and LAMA3 gene polymorphisms and the risk for severe pelvic organ prolapse显示文摘Pelvic organ prolapse (POP) is the descent of the pelvic organs,including bladder, uterus, vagina and rectum, resulting in pelvic discomfort, urinary and fecal incontinence and sexual dysfunction(1)The prevalence of symptomatic POP in China is 9.56%according to a cross-sectional study involving 54,000 adult women in six provinces in the mainland of China (unpublished data). The etiology of this disorder is multifactorial, including race, age, body mass index(BMI), parity and menopause (1)The loss of the integrity of vaginal connective tissue has been demonstrated to weaken the pelvic floor support and promote the development of POP. | Lei Li Jia Kang Ye Zhang Meng Mao Yuxiang Yang Jinghe Lang Zhijing Sun Juan Chen Lan Zhu | 2019 | Science Bulletin2019，64，7： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员