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Effect of loading rates on the characteristics of thermal damage for mudstone under different temperatures

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International Journal of Mining Science and Technology 2015年第5期25卷 797-801页

作者： Mao Rongrong Mao Xianbiao Zhang Lianying liu ruixue State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology Civil Engineering Department Xuzhou Institute of Technology

The uniaxial compression tests for mudstone specimens are carried out with four different loading rates from room temperature to 400℃ by using the Rock Mechanics Servo-controlled Testing System MTS810 and high temperature furnace *** mechanical properties of mudstone with various loading rates are studied under different temperature *** results show that when temperature increases from room temperature to 400℃ and loading rate is less than 0.03 mm/s,the peak strength of mudstone specimen decreases as loading rate increases,while the various peak strengths show significant differences when loading rate exceeds 0.03 mm/*** room temperature,the elastic modulus decreases at the first time and then increases with loading rate *** the temperature is between200 and 400℃,the elastic modulus presents a decreasing trend with increasing loading *** increasing the loading rate,the number of fragments in mudstone becomes larger and even the powder is observed in mudstone with higher loading *** high loading rate,the failure mode of mudstone specimens under different temperatures is mainly conical damage.

关键词： Mudstone High temperature Loading rate Characteristics of thermal damage

Hydroxyl radical production by abiotic oxidation of pyrite under estuarine conditions:The effects of aging,seawater anions and illumination

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Journal of Environmental Sciences 2024年第1期135卷 715-727页

作者： ruixue liu Yinshun Dai Yucheng Feng Shiwen Sun Xiaodong Zhang Chunjiang An Shan Zhao Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityQingdao 266237China Department of Building Civil and Environmental EngineeringConcordia UniversityMontrealQC H3G 1M8Canada

Pyrite is widely distributed in estuarine sediments as an inexpensive natural Fenton-like reagent,however,the mechanism on the hydroxyl radical(HO^(·))production by pyrite under estuarine environmental conditions is still poorly *** batch experiments were performed to investigate the effects of estuarine conditions including aging(in air,in water),seawater anions(Cl^(-),Br^(-)and HCO_(3)^(-))and light on the HO^(·)production by pyrite *** one-electron transfer dominated the process from O_(2) to HO^(·)induced by oxidation of *** Fe(oxyhydr)oxide coatings on the surface of pyrite aged in air and water consumed hydrogen peroxide while mediating the electron transfer,and the combined effect of the two resulted in a suppression of HO^(·)production in the early stage of aging and a promotion of HO^(·)production in the later stage of *** of the surface oxide layers by aggressive anions was the main reason for the inhibition of HO^(·)production by Cl^(-)and Br^(-),and the generation of Cl^(·)and Br^(·)may also play a role in the scavenging of HO^(·).HCO_(3)^(-)increased the average rate of HO^(·)production through surface-CO_(2) complexes formed by adsorption on the surface of *** significant enhancement of HO^(·)production under light was attributed to the formation of photoelectrons induced by photochemical reactions on pyrite and its surface oxide *** findings provide new insights into the environmental chemical behavior of pyrite in the estuary and enrich the understanding of natural remediation of estuarine environments.

关键词： Hydroxyl radical Pyrite oxidation Aging Anions Irradiation

Leaky Cable Fixture Detection in Railway Tunnel Based on RW DCGAN and Compressed GS-YOLOv5

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Intelligent Automation & Soft Computing 2023年第7期37卷 1163-1180页

作者： Suhang Li Yunzuo Zhang ruixue liu Jiayu Zhang Zhouchen Song Yutai Wang School of Information Science and Technology Shijiazhuang Tiedao UniversityShijiazhuang050043China Australian National University Canberra2600ACTAustralia

The communication system of high-speed trains in railway tunnels needs to be built with leaky cables fixed on the tunnel wall with special *** ensure safety,checking the regular leaky cable fixture is necessary to elimi-nate the potential *** present,the existing fixture detection algorithms are difficult to take into account detection accuracy and speed at the same *** faulty fixture is also insufficient and difficult to obtain,seriously affecting the model detection *** solve these problems,an innovative detection method is proposed in this ***,we presented the Res-Net and Wasserstein-Deep Convolution GAN(RW-DCGAN)to implement data augmentation,which can enable the faulty fixture to export more high-quality and irregular ***,we proposed the Ghost SENet-YOLOv5(GS-YOLOv5)to enhance the expression of fixture feature,and further improve the detection accuracy and ***,we adopted the model compression strategy to prune redundant channels,and visualized training details with Grad-CAM to verify the reliability of our *** results show that the algorithm model is 69.06%smaller than the original YOLOv5 model,with 70.07%fewer parameters,2.1%higher accuracy and 14.82 fps faster speed,meeting the needs of tunnel fixture detection.

关键词： Leaky cable fixture detection RW-DCGAN compressed strategy GS-YOLOv5

Macroscopic and microscopic fracture features of concrete used in coal mine under chlorine salt erosion

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International Journal of Mining Science and Technology 2016年第3期26卷 455-459页

作者： Li Bing Yin Huiguang Mao Xianbiao Li Yan Zhang Lianying liu ruixue Qiu Peitao State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology School of Civil Engineering Xuzhou Institute of Technology School of Mechanics & Civil Engineering China University of Mining & Technology

The microscopic morphology and pore structure characteristics of concrete with composite admixtures(fly ash and mineral powder) after chlorine salt erosion were analyzed via scanning electron microscopy(SEM) and mercury injection porosimetry(MIP), providing the basis for the design and maintenance of concrete shafts in coal mines. The above-mentioned characteristics were compared with the macroscopic characteristic of concrete fractures under uniaxial compression. The results show that the macroscopic fracture characteristics of concrete under uniaxial compression change from longitudinal split fracture and oblique section shear fracture to conjugate cant fracture, and the degree of breakage *** cracks, cement paste cracks, spherical surface cracks, and aggregate cracks appear in concrete under uniaxial compression. In the early stages of corrosion, the original cracks which are obvious are repaired. When the corrosion becomes more serious, cement paste cracks appear, and the number of harmful holes increases while the number of harmless holes decreases. This study also reveals the relationship between the macroscopic properties and microscopic structure of concrete under chloride salt erosion. Finally, the paper preliminarily discussed the relationship between the macroscopic properties and mesoscopic characteristics of concrete under chlorine salt erosion.

关键词： Concrete Chlorine salt erosion Mesoscopic characteristic Damage fracture

Lgr5^+ intestinal stem cell sorting and organoid culture

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Animal Models and Experimental Medicine 2019年第2期2卷 132-135页

作者： ruixue liu Haifeng Li Juan Cai Qiang Wei Xiaonan Han Key Laboratory of Human Disease Comparative Medicine The Ministry of Health Institute of Laboratory Animal Science (ILAS) Chinese Academy of Medical Science (CAMS) and Peking Union Medical College (PUMC)

Intestinal epithelial stem cells (IESCs) are one of the most rapidly self‐renewing and proliferating adult stem cells. The IESCs reside at the bottom of intestinal and colonic crypts, giving rise to all intestinal epithelial lineages and maintaining intestinal epithelial replenishment. The technique of three‐dimensional culture based upon intestinal stem cell biology has been recently developed to study gastrointestinal development and disease pathogenesis. Here, we summarize the techniques used to isolate Lgr5‐ positive IESCs to form the enteroids from intestine or colonoids from colon, and present the means to examine these organoid functions. This study will provide a simple and practical way for producing intestinal tissues in the laboratory.

关键词： colonoids enteroids Lgr5 intestinal stem cells organoid culture

Grand Theatres： Easy to Build, but Hard to Operate

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China & The World Cultural Exchange 2014年第9期80卷 22-23页

作者： Mao Xiubing liu ruixue

Building theatres has become a trend in China. According to statistics trom the publicchannel, the theatre construction is now spreading from the first-tier cities to the second and third-tier cities, with ever increasing investment volume and land areas. It is estimated that in the next 3-s years, there will be about 10 theatres completed and delivered for operation every years. However, how to operate the newly built theatres is a key issue, among which, the management and provision of contents are major challenges.

关键词：大剧院操作城市蔓延土地面积大厦

大西洋和西太平洋海域热带气旋海表面入流角和拖曳系数特征对比分析

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地球物理学报 2021年第8期64卷 2579-2589页

作者：刘瑞雪明杰南京大学大气科学学院中尺度灾害性天气教育部重点实验室南京210023 中国气象局—南京大学天气雷达及资料应用联合开放实验室南京210023

本文利用大量全球定位下投式探空仪(dropsonde)资料,对15个大西洋飓风和11个西太平洋台风海域的入流角频数分布差异进行对比,探究在热带气旋不同强度和不同边界层平均风速下入流角的分布特征,分析了两个海域拖曳系数随入流角变化的趋势... 详细信息

本文利用大量全球定位下投式探空仪(dropsonde)资料,对15个大西洋飓风和11个西太平洋台风海域的入流角频数分布差异进行对比,探究在热带气旋不同强度和不同边界层平均风速下入流角的分布特征,分析了两个海域拖曳系数随入流角变化的趋势.结果表明,两海域在热带气旋背景下的入流角分布具有共同点:在强度更大的热带气旋里入流角的平均值更大,分布更集中,入流角在不同风速范围内均呈正态分布且差异较小;同时两海域的入流角特征也存在差异,大西洋飓风的平均入流角大于西太平洋台风,并且大西洋飓风的拖曳系数随着入流角增加而增大,而西太平洋台风的拖曳系数随入流角的增加先减小后增大.研究结果为探究热带气旋背景下入流角的作用和影响拖曳系数变化的因子提供了新的参考.

关键词：入流角下投式探空仪热带气旋拖曳系数

Flood-illuminated adaptive optics ophthalmoscope with a single curved relay mirror

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Photonics Research 2013年第3期1卷 124-129页

作者： ruixue liu Yue Qi Xianliang Zheng Mingliang Xia Li Xuan State Key Laboratory of Applied Optics Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchunJilin 130033China University of Chinese Academy of Sciences Beijing 100039China Jiangsu Key Laboratory of Medical Optics Suzhou Institute of Biomedical Engineering and TechnologyChinese Academy of SciencesSuzhouJiangsu 215163China

For decreasing light loss and diminishing the aberrations of the optical system,an open-loop adaptive optics(AO)system for retinal imaging in vivo is *** advantage of the ability of young human eyes to accommodate,there was only one single curved mirror to make the pupil of the eye conjugate with the wavefront corrector and the wavefront sensor.A liquid crystal spatial light modulator(LC-SLM)was adopted as the wavefront corrector because the LC-SLM can be made in a small size to match the *** reduce a pair of lenses or focusing mirrors,the wavefront corrector and sensor are positioned in the noncommon *** system adopts open-loop control and the high-precision LC-SLM guarantees the effectiveness of the AO *** designed field of view is 1°on the retina(about 300μm).The image quality was simulated with different mirror surface types,including circular,parabolic,and hyperbolic.A hyperbolic mirror with conic constant−1.07,which is close to−1,could best eliminate the *** analysis showed that the optical throughput of this system was at least 22.4%higher than that of a standard transmission AO *** a practical experiment,a parabolic mirror was positioned in the optical *** of the cone photoreceptors and the capillary vessels were obtained *** system simplifies the optical setup in comparison to the commonly used 4F systems while still guaranteeing the effectiveness of AO to correct the ocular aberrations.

关键词： mirror optics curved

A novel thermosensitive hydrogel based on biodegradable poly(ethylene glycol) analogues

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A novel thermosensitive hydrogel based on biodegradable poly...