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| 1 | Similar simulation study on the deformation and failure of surrounding rock of a large section chamber group under dynamic loading显示文摘Large and super-large section chamber groups in coal mines are frequently affected by dynamic loads resulting from production activities such as roadway driving and blasting.The stability of the surrounding rock is poor,and it is difficult to control.In this paper,a similar simulation test was used to study the deformation and evolution laws of the surrounding rock of a triangle-shaped chamber group under different dynamic loads.The results showed that under dynamic loading,the vertical stress of the surrounding rock of the chamber group increased in an oscillatory form.The maximum stress concentration coefficient reached 4.09.The damage degree of the roof was greater than that of the two sides.The deformation of the roof was approximately 1.2 times that of the two sides.For the chamber closer to the power source,the stress oscillation amplitude of the surrounding rock was larger,and the failure was more serious.The force of the anchorage structure showed a phased increasing characteristic;additionally,the force of the anchorage structure on the adjacent side of the chambers was greater than that on the other side.This study reveals the deformation and failure evolution laws of the surrounding rock of large section chamber groups under dynamic loading. | Xuesheng Liu Shilin Song Yunliang Tan Deyuan Fan Jianguo Ning Xuebin Li Yanchun Yin | 2021 | International Journal of Mining Science and Technology2021，31，3： | 6 |
| 2 | Study on pure silica core optical fibers显示文摘An optimal refractive index profile of pure silica core optical fiber (PSCF) was de- signed, in combination with the characters of the modified chemical vapor deposi- tion (MCVD) process. Techniques of preform fabrication by a new furnace round heating MCVD process and fiber drawing process were reviewed. Difficulties in doping fluorine in silica, widening the depressed-index cladding and maintaining the index of fiber core were discussed. Methods used to overcome these difficulties were given at the same time. Additionally, the optimal refractive index profiles of PSCF were presented. | LI Jian ZHENG Kai CHANG DeYuan WEI Huai NING TiGang FU YongJun MAO XiangQiao YAN FengPing JIAN Wei JIAN ShuiSheng | 2008 | Science China(Technological Sciences)2008，51，1： | 1 |
| 3 | Creep behavior and effect factors of a TiAl-Nb alloy at high temperatu显示文摘The effect of solution treatment on the microstructure and creep properties of forged TiAl-Nb alloys was investigated.The results showed that the microstructure of forged alloy mainly consisted ofγ/α2 lamellar colonies and fine equiaxed recrystallizedγ/α2 grains.During the solution treatment the microstructure of the alloy transformed into a fully lamellar structure due to the lamellar colonies growth by consuming equiaxed grains.Compared with the forged alloy the creep life of the solution treated alloy at 800℃/220 MPa increased from 116 h to 339 h.The better creep resistance may be attributed to the transform of fine equiaxedγ/α2 grain to the lamellar colonies with serrated grain boundaries due to the solution treatment.The deformation mechanism of the solution treated alloy during creep is considered to be dislocation slipping within the lamellarγ/α2 phases,and the dislocation movement may be hindered by theγ/α2 interface and the formation of dislocation tangles.The interaction of the dislocations with the tangles may increase the resistance of the dislocation motion and hence improve the creep resistance of the alloy.It was found that during the creep of the forged alloys the cracks mainly initiated at the equiaxed grain,and in the solution treated alloy the cracks initiated at the grain boundaries.As creep continued the cracks propagated and connected to each other,leading to the damage and rupture of the forged and solution treated alloys. | Shunke Zhang Sugui Tian Gengyu Li Ning Tian Fangwei Jin Huichen Yu Xiaoxia Lv Guangyan Wang Deyuan Li | 2021 | Progress in Natural Science:Materials International2021，31，3： | 0 |
| 4 | Analysis of the clinical features and risk factors of death in patients with mushroom poisoning显示文摘Background:Wild edible mushrooms are rich in nutrition and popular with people;however,few laboratory studies are available about the predictability of outcomes among patients with mushroom poisoning.Therefore,this study aimed to analyze the clinical features and death risk factors of patients with mushroom poisoning.Methods:Patients with mushroom poisoning admitted to the hospital from 2015 to 2021 were retrospectively evaluated.Results:A total of 197 patients with mushroom poisoning were enrolled in this study,of which 100(50.76%)were males,and the mortality was 10.66%(21/197).Patients who died were more likely to have demonstrated a long latency,high alanine aminotransferase,aspartate aminotransferase,direct bilirubin,total bilirubin(TB),activated partial thromboplastin time,prothrombin time,international normalized ratio,creatinine,and blood urea nitrogen.Multiple logistic regression analysis indicated that TB level greater than or equal to 34.2μmol/L had the greatest lethal risk and could increase the risk of death by 14.588 times(odds ratio:15.588;95%confidence interval:2.088-116.351),which indicated that TB was an independent risk factor of death in patients with acute mushroom poisoning.Conclusion:Bilirubin concentration was associated with the increased likelihood of mortality.Total bilirubin was the independent risk factor of mushroom poisoning. | Yan Yang Ruifei Shao Jinfang Xue Xiran Lou Deyuan Ning Guobing Chen | 2023 | Emergency and Critical Care Medicine2023，3，1： | 0 |
| 5 | Deformation and damage behaviors of as-cast TiAl-Nb alloy during creep显示文摘By means of creep properties measurement and microstructure observation,the deformation and damage behavior of an as-cast TiAl-Nb alloy during creep at temperature near 750°C were investigated.The results showed that the microstructure of the alloy consisted of lamellarγ/α_2 phase,and the boundaries consisted ofγphase located in between lamellarγ/α_2 phases with different orientations.In the latter stage of creep,the dislocation networks appeared in the interfaces of lamellarγ/α_2 phases due to the coarsening of them,which made the coherent interface transforming into the semi-coherent one for reducing its adhesive strength.The deformation mechanism of the alloy during creep was twinning and dislocations slipping within lamellarγ/α_2 phases.In the later period of creep,significant amount of dislocations plied up in the interfaces of lamellarγ/α_2 phases,which may cause the stress concentration to promote the initiation and propagation of the cracks along the lamellarγ/α_2interfaces perpendicular to the stress axis.Wherein,some cracks on the various cross-sections were connected by tearing edge along the direction of maximum shear stress,up to the creep fracture,which is considered to be the damage and fracture mechanism of alloy during creep at 750°C. | Shunke Zhang Sugui Tian Xiaoxia Lv Huichen Yu Ning Tian Zehui Jiao Guoqi Zhao Deyuan Li | 2018 | Progress in Natural Science:Materials International2018，28，5： | 0 |
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