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Shear weakening behavior at the surface of structural plane of rock

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Yantu Lixue/Rock and Soil Mechanics 2020年 41卷 19-29页

作者： He, Liu Zhao, zhi-Ming wu, Guang Liu, Di-Yi Faculty of Geosciences and Environmental Engineering Southwest Jiaotong University Chengdu 611756 China

Based on a series of direct shear test results of structural planes of similar materials of rock mass, the initial morphology of different structural planes Z2, structural surface wall strength JCS and normal stress σn on the shear weakening and failure of structural surfaces are studied under different shear displacement conditions by applying the three-dimensional scanning identification technique. The results show that the surface damage coefficient (N) of the joint surfaces with higher Z2(initial), JCS and σn increases significantly at different shear displacements with the continuous increase of shear displacement. Structural surfaces with a much higher JCS value are dominated by brittle failure, while structural surfaces with a smaller JCS value are dominated by wear-out failure. During the shear process, the weakening of the structural surface morphology is caused by the "shear effect" of the surface protrusion, and also the "filling effect" of the depressed area of the structural plane. Based on the degradation rate of the morphology factor of structural plane Z2(δ) at different shear displacement, the degradation process of joint surface was classified into three stages with the shear displacement: the initial degradation stage, rapid degradation stage, and constant degradation stage. With the increase of Z2(initial), JCS and σn, the segmentation characteristics of degradation of structural planes become much more obvious, and the transformation process of three stages has an accelerating trend. An empirical model of joint surface morphology degradation under the influence of different factors is proposed through the regression analysis. The results indicate that the accurate tracking on the weakening characteristics of the structural surface morphology during the shearing process is beneficial to study the evolution of mechanical properties of the structural surfaces during the shearing process. © 2020, Science Press. All right reserved.

关键词： Surface morphology

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乏燃料批式溶解器放大设计与水力学试验研究

原子能科学技术 2016年第8期50卷 1480-1485页

作者：吴志强秦永泉刘郢侯媛媛中国核电工程有限公司北京100840

为提高乏燃料批式溶解器的处理能力,满足我国工业规模后处理厂的要求,以现有的批式溶解器为基础,提出了一种采用笼式固体中子毒物的溶解器放大设计方案,并据此设计和加工了试验样机及试验台架,开展了水力学试验研究。水力学试验结果表明... 详细信息

为提高乏燃料批式溶解器的处理能力,满足我国工业规模后处理厂的要求,以现有的批式溶解器为基础,提出了一种采用笼式固体中子毒物的溶解器放大设计方案,并据此设计和加工了试验样机及试验台架,开展了水力学试验研究。水力学试验结果表明:鼓泡压空流量、鼓泡压空入口位置、液相温度和蒸汽流量是影响溶解器循环速率的显著因素,而负载、气相压力和液位对循环速率的影响相对较小;循环速率随鼓泡压空流量的对数值几乎呈线性增加趋势。

关键词：乏燃料后处理批式溶解器固体中子毒物水力学循环速率

Role of minimally invasive techniques in gastrointestinal surgery:Current status and future perspectives

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World Journal of Gastrointestinal Surgery 2021年第9期13卷 941-952页

作者： Shan-Ping Ye Wei-Quan Zhu zhi-Xiang Huang Dong-Ning Liu Xiang-Qiong Wen Tai-yuan Li Department of General Surgery The First Affiliated Hospital of Nanchang UniversityNanchang 330006Jiangxi ProvinceChina Institute of Digestive Surgery The First Affiliated Hospital of Nanchang UniversityNanchang 330006Jiangxi ProvinceChina Jiangxi Medical College of Nanchang University Nanchang 330006Jiangxi ProvinceChina

In recent years,the incidence of gastrointestinal cancer has remained ***,surgical resection is still the most effective method for treating gastrointestinal ***,radical surgery depends on open ***,traditional open surgery inflicts great trauma and is associated with a slow *** invasive surgery,which aims to reduce postoperative complications and accelerate postoperative recovery,has been rapidly developed in the last two decades;it is increasingly used in the field of gastrointestinal surgery and widely used in early-stage gastrointestinal ***,many operations for gastrointestinal cancer treatment are still performed by open *** reason for this may be the challenges of minimally invasive technology,especially when operating in narrow spaces,such as within the pelvis or near the upper edge of the ***,some of the current literature has questioned oncologic outcomes after minimally invasive surgery for gastrointestinal ***,the current evidence suggests that minimally invasive techniques are safe and feasible in gastrointestinal cancer surgery,but most of the studies published in this field are retrospective studies and casematched ***-scale randomized prospective studies are needed to further support the application of minimally invasive *** this review,we summarize several common minimally invasive methods used to treat gastrointestinal cancer and discuss the advances in the minimally invasive treatment of gastrointestinal cancer in detail.

关键词： Gastrointestinal neoplasms Laparoscopy Minimally invasive surgical procedures Robotic surgical procedures Therapeutics

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栎属植物资源及其在园林中的应用前景

北方园艺 2008年第7期 174-177页

作者：吴媛包志毅浙江大学园艺系浙江杭州310029 浙江林学院园林学院浙江杭州311300

我国栎属植物资源丰富,有60余种,全国各省区均有分布。栎属植物树体高大、叶形优美、适应性强,具有较高的园林应用价值。首先综述了我国栎属植物原种和变种资源,其次介绍了常用的种类及其优良性状、园林应用状况,并推荐一些国外引入的... 详细信息

我国栎属植物资源丰富,有60余种,全国各省区均有分布。栎属植物树体高大、叶形优美、适应性强,具有较高的园林应用价值。首先综述了我国栎属植物原种和变种资源,其次介绍了常用的种类及其优良性状、园林应用状况,并推荐一些国外引入的优良栎属植物种类,阐述栎属植物在园林中的应用前景。与欧美国家对栎属的应用相比,我国对栎属植物的深入研究和园林应用亟待加强。

关键词：植物资源栎属园林应用

Development and Characterization of SYBR Green I Based RT-PCR Assay for Detection of Omsk Hemorrhagic Fever Virus

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Virologica Sinica 2021年第6期36卷 1644-1647页

作者： Ya-Nan Zhang Si-Qing Liu Cheng-Lin Deng zhi-Ming yuan Bo Zhang Xiao-Dan Li Han-Qing Ye Key Laboratory of Special Pathogens and Biosafety Wuhan Institute of VirologyCenter for Biosafety Mega-ScienceChinese Academy of SciencesWuhan 430071China Department of Medical Genetics Oslo University Hospital0450 OsloNorway School of Medicine Hunan Normal UniversityChangsha 410081China

Dear Editor,Omsk hemorrhagic fever virus(OHFV)belongs to the tickborne virus group within Flavivirus,in Flaviviridae family(Holbrook et al.2005)which consists of several important human pathogens including tick-borne encephalitis virus(TBEV),Powassan virus(POWV),Louping ill virus(LIV),Langat virus(LGTV)and Kyasnaur Forest disease virus(KFDV)(Yoshii and Holbrook 2009).OHFV is an enveloped virus containing a single-stranded positive-sense RNA genome of approximately 11,000 *** genome has a single open reading frame,which encodes three structural proteins[capsid(C),pre-membrane(prM)or membrane(M),and envelop(E)]and seven non-structural proteins(NS1,NS2a,NS2b,NS3,NS4a,NS4b and NS5)between the 5'untranslated region(UTR)and 3'UTR(Chambers et al.1990).

关键词： al. encephalitis hemorrhagic

Wide-field in situ multiplexed Raman imaging with superresolution

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Photonics Research 2018年第6期6卷 530-534页

作者： HOUKAI CHEN XIAOJING wu YUQUAN ZHANG YONG YANG CHANGJUN MIN SIWEI ZHU XIAOCONG yuan QIAOLIANG BAO JING BU Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology Shenzhen UniversityShenzhen 518060 China Tianjin Union Medical Center Tianjin 300121 China Institute of Modern Optics Nankai University Tianjin 300071 China College of Electronic Science and Technology Shenzhen UniversituyShenzhen 518060 China

Because of the fingerprint-like specificity of its characteristic spectrogram, Raman spectral imaging has been applied widely in various research areas. Using a combination of structured illumination with the surface- enhanced Raman scattering （SERS） technique, wide-field Raman imaging is developed with a significant improve- ment in spatial resolution. As a result of the relatively narrow Raman characteristic peaks, optically encoded SERS nanoparticles can be used to perform multiplexed imaging. The results show excellent superresolution wide-fidd multiplexed imaging performance. The developed technique has extraordinary potential for applications in biological imaging and other related fields.

关键词： Raman microscopy Surface-enhanced Raman scattering Superresolution

Facile Access to Uranium and Thorium Phosphaethynolate Complexes Supported by Tren: Experimental and Theoretical Study

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Chinese Journal of Chemistry 2021年第8期39卷 2125-2131页

作者： Jipan Yu Kang Liu Qunyan wu Bin Li Xianghe Kong Kongqiu Hu Lei Mei Liyong yuan zhifang Chai Weiqun Shi Laboratory of Nuclear Energy Chemistry Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Engineering Laboratory of Advanced Energy Materials Institute of Industrial TechnologyChinese Academy of SciencesNingboZhejiang 315201China

The issue of covale nee of acti nide complexes remai ns con troversial to *** in troducti on of 2-phosphaethy nolate anion into acti・nide complexes is expected to in vestigate the reaction mode and the bon ding *** n,we describe the function alizatio n of An(Tren^(TIPS))CI(1:An=U;2:An=Th)precursors with NaOCP(dioxane)_(2.5) through salt-elimination method leading to the formation of the corresponding uranium and thorium phosphaethynolate species:[U(Tren^(TIPS))(OCP)]⑶and[Th(Tren^(TIPS))(OCP)](4).

关键词： Uranium Thorium Tripodal ligand Computational chemistry Electronic structure

Prevalence and characteristics of ophthalmological extra-intestinal manifestations in Chinese patients with inflammatory bowel disease

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International Journal of Ophthalmology(English edition) 2016年第10期9卷 1476-1479页

作者： Ying-Chao Li Wei-zhi Li Chang-Rui wu Yun Feng Li Ren Chen Mi Yang Li Department of Gastroenterology the First Affiliated Hospital of Xi'an Jiaotong University Department of Ophthalmology the First Affiliated Hospital of Xi'an Jiaotong University Department of Otolaryngology-Head and Neck Surgery the Second Affiliated Hospital of Xi'an Jiaotong University

AIM：To investigate the prevalence of ophthalmological extra-intestinal manifestations（O-EIMs） in Chinese patients with inflammatory bowel disease（IBD） and to identify risk factors for the development of ***：The study population consisted of Chinese patients with a definite diagnosis of Crohn＇s disease（CD） or ulcerative colitis（UC） in a large teaching hospital between January 1995 and December *** and clinical characteristics of patients were extracted ***： In this twenty-year cohort,645 IBD patients（517 with UC,128 with CD） were *** them122（18.9%） exhibited at least one *** 13 patients（2.0%） developed O-EIMs,7 of CD（5.5%） and 6 of UC（1.2%）.Clinical ophthalmological manifestations included redness（76.9%）,burning（61.5%）,pain（38.5%）,itching（15.4%） of eyes and vision change（7.7%）.O-EIMs included episcleritis（7）,uveitis（5） and dry eye（1）.OEIMs were more prevalent in female（odds ratio for male0.61,95% confidence interval 0.52-0.73,P 〈0.0001）,and patients who had IBD diagnosis at young age（odds ratio for patients aged 〉30 years 0.76,95% confidence interval0.65-0.88,P 〈0.0001）.CONCLUSION： The frequency of O-EIMs in Chinese patients with IBD is lower than the rates reported in the studies of European and American *** uveitis are the most common O-EIMs.O-EIMs are more frequent in patients with CD and more prevalent in female and patients who have IBD diagnosis at young age.

关键词： ophthalmological extraintestinal manifestations inflammatory bowel disease episcleritis uveitis

Control over emissivity of zero-static-power thermal emitters based on phase-changing material GST

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Light(Science & Applications) 2016年第1期5卷 313-319页

作者： Kai-Kai Du Qiang Li Yan-Biao Lyu Ji-Chao Ding Yue Lu zhi-yuan Cheng Min Qiu State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China College of Information Science&Electronic Engineering Zhejiang UniversityHangzhou 310027China

Controlling the emissivity of a thermal emitter has attracted growing interest,with a view toward a new generation of thermal emission *** date,all demonstrations have involved using sustained external electric or thermal consumption to maintain a desired *** the present study,we demonstrated control over the emissivity of a thermal emitter consisting of a film of phase-changing material Ge2Sb2Te5(GST)on top of a metal *** thermal emitter achieves broad wavelength-selective spectral emissivity in the *** peak emissivity approaches the ideal blackbody maximum,and a maximum extinction ratio of 410 dB is attainable by switching the GST between the crystalline and amorphous *** controlling the intermediate phases,the emissivity can be continuously *** switchable,tunable,wavelength-selective and thermally stable thermal emitter will pave the way toward the ultimate control of thermal emissivity in the field of fundamental science as well as for energy harvesting and thermal control applications,including thermophotovoltaics,light sources,infrared imaging and radiative coolers.

关键词： absorptivity emissivity mid-infrared switchable thermal emitters