检索结果-南通市图书馆

Penile sensory thresholds in subtypes of premature ejaculation： implications of comorbid erectile dysfunction

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2018年第4期20卷 330-335页

作者： xiang Chen fei-xiang wang Chao HU Nian-Qin Yang Ji-Can Dai Department of Urology Ren Ji Hospital School of Medicine Shanghai Jiao Tong University Shanghai 200001 China Department of Urology Zhongshan Hospital Fudan University Shanghai 200032 China Shanghai Key Laboratory of Forensic Medicine Shanghai Forensic Service Platform Academy of Forensic Science Shangha 200063 China

Penile hypersensitivity plays an important role in premature ejaculation （PE）, but differences in penile sensitivity among subtypes of PE are unknown. Therefore, we compared penile sensory thresholds in PE subtypes of lifelong and acquired PE, PE with and without erectile dysfunction （ED）, PE with an intravaginal ejaculation latency time 〈1 min and 〉1 min, and PE with and without orgasmic pleasure perceptual dysfunction. During August 2014 to January 2016, 136 patients with PE were included. Penile warm, cold, and vibratory thresholds were measured. Data of clinical characteristics, sexual life, Premature Ejaculation Diagnostic Tool （PEDT） score, and the 5-item version of the International Index of Erectile Function （IIEF-5） score were collected. Vibratory thresholds of the PE with ED group were higher in the right coronal sulcus （median amplitude： 4.92 vs 3.65 μm, P= 0.02） and the right penile shaft （median amplitude： 3.87 vs 3.30 μm, P = 0.03）, while differences in penile sensory thresholds between other subtypes were not significant. The median PEDT score was lower in the PE without ED group （12 vs 14, P 〈 0.001）. The IIEF-5 and PEDT scores were negatively correlated （r = -0.29, P 〈 0.001）. Patients with orgasmic pleasure perceptual dysfunction had a lower median IIEF-5 score （20 vs 21, P = 0.02）. Patients with PE and ED had lower penile sensitivity, and ED was associated with more severe symptoms and weaker orgasmic pleasure perception. In men with PE, management of comorbid ED is necessary. In case of side effects in erectile function, topical anesthetics should be cautiously used in men with PE and ED.

关键词： classification erectile dysfunction penile sensitivity penis premature ejaculation sensory thresholds

Effect of rare earth on primary carbides in H13 die steel and their addition method:a review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第3期31卷 531-551页

作者： Jing-feng wang Lin-zhu wang Chao-yi Chen xiang wang fei Zhao School of Materials and Metallurgy Guizhou UniversityGuiyang 550025GuizhouChina Zhengzhou Railway Vocational and Technical College Zhengzhou 450000HenanChina Guizhou Provincial University Key Laboratory of High Performance Battery Materials Guizhou UniversityGuiyang 550025GuizhouChina Shougang Guiyang Special Steel Co. Guiyang 550005GuizhouChina

Larger-sized primary carbides lead to stress concentration during the application of H13 hot-work die steel,resulting in microcracks and fatigue *** earth was usually added to modify the carbides and *** existing literature is reviewed on the effect of rare earth on primary carbides in H13 steel.A comprehensive review on the effect of rare earth on the characteristics of primary carbides,i.e.,number,size,morphology,and thermal stability in H13 steel,was *** precipitation mechanism and nucleation of primary carbides with rare earth were *** position and form of rare earth in steel and their effects on alloying elements segregation were *** addition techniques of rare earth in H13 steel were compared,and the prospects for other uncommon rare earth and emerging technology were *** on the current references,it can be known that adding rare earth facilitated refined and dispersed primary *** size of primary carbides would be reduced,and their morphology would be improved because the rare earth inclusions formed in H13 steel can act as nucleation cores forγ-Fe orδ-Fe,refining the dendritic ***,the number of primary carbides at grain boundaries would be significantly ***,rare earth had little impact on thermal *** nucleation of primary carbides tended to be inhibited due to the modification of inclusions by rare earth which were likely to be nucleation cores for primary *** earth had been reported to affect the mechanism and process of primary carbide ***,the addition of rare earth can inhibit the segregation of alloying elements and carbon diffusion by ***,laboratory experiments and theoretical calcu-lations need to be conducted to study the states and evolution of rare earth steels.

关键词： Rare earth H13 die steel Primary carbide Nucleation Dendritic structure

Adding a vacuum erection device to regular use of Tadalafil improves penile rehabilitation after posterior urethroplasty

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2019年第6期21卷 582-586页

作者： Dong-Liang Zhang Zhong Chen fei-xiang wang Jiong Zhang Hong Xie Ze-Yu wang Yu-Bo Gu Qiang Fu Lu-Jie Song Department of Urology Shanghai Jiao Tong University Affiliated Sixth People's HospitalShanghai Oriental Institute for Urologic ReconstructionShanghai 200233China Academy of Forensic Science Shanghai Key Laboratory of Forensic MedicineShanghai 200233China.

This study aimed to evaluate whether adding a vacuum erection device(VED)to regular use of Tadalafil could achieve better penile rehabilitation following posterior urethroplasty for pelvic fracture-related urethral injury(PFUI).Altogether,78 PFUI patients with erectile dysfunction(ED)after primary posterior urethroplasty were enrolled and divided into two treatment groups:VED combined with Tadalafil(Group 1,n=36)and Tadalafil only(Group 2,n=42).Changes in penile length,testosterone level,International Index of Erectile Function-5(IIEF-5)questionnaire,Quality of Erection Questionnaire(QEQ),and nocturnal penile tumescence(NPT)testing were used to assess erectile function before and after 6 months of ED *** showed that the addition of VED to regular use of Tadalafil preserved more penile length statistically(0.4±0.9 vs-0.8±0.7 cm,P<0.01).IIEF-5 score and QEQ score in Group 1 were higher than Group 2(both P<0.05).After treatment,21/36(5&3%)Group 1 patients and 19/42(45.2%)Group 2 patients could complete vaginal *** 1 patients also had markedly improved testosterone levels(P=0.01).Unexpectedly,there was no significant difference in NPT testing between two *** PFUI patients with ED after posterior urethroplasty,the addition of VED to regular use of Tadalafil could significantly improve their conditions-improving erection and increasing penile length-thus increasing patient satisfaction and confidence in penile rehabilitation.

关键词： pelvic fracture urethral injury penile rehabilitatio n posterior urethroplasty Tadalafil vacuum erecti on devices

Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 146-154页

作者： Yongchul Yoo xiang Zhang fei wang Xin Chen Xing-Zhong Li Michael Nastasi Bai Cui Department of Mechanical&Materials Engineering University of Nebraska-LincolnLincolnNE 68588USA Nebraska Center for Materials and Nanoscience University of Nebraska-LincolnLincolnNE 68588USA Department of Nuclear Engineering Texas A&M UniversityCollege StationTX 77843USA

W-based WTaVCr refractory high entropy alloys (RHEA) may be novel and promising candidate materials for plasma facing components in the first wall and diverter in fusion reactors. This alloy has been developed by a powder metallurgy process combining mechanical alloying and spark plasma sintering (SPS). The SPSed samples contained two phases, in which the matrix is RHEA with a body-centered cubic structure, while the oxide phase was most likely Ta2VO6through a combined analysis of X-ray diffraction (XRD),energy-dispersive spectroscopy (EDS), and selected area electron diffraction (SAED). The higher oxygen affinity of Ta and V may explain the preferential formation of their oxide phases based on thermodynamic calculations. Electron backscatter diffraction (EBSD) revealed an average grain size of 6.2μm. WTaVCr RHEA showed a peak compressive strength of 2997 MPa at room temperature and much higher micro-and nano-hardness than W and other W-based RHEAs in the literature. Their high Rockwell hardness can be retained to at least 1000°C.

关键词： refractory high entropy alloy plasma-facing material fusion reactor spark plasma sintering

Reduction of unactivated alkyl chlorides enabled by light-induced single electron transfer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第2期67卷 471-481页

作者： Lei Dai Zhao-fei Zhang xiang-Yu Chen School of Chemical Sciences University of the Chinese Academy of SciencesBeijing100049China Institute of Chemistry Chinese Academy of SciencesBeijing100190China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology ParkBinzhou256606China

Alkyl chlorides are abundant and easily accessible starting ***,due to the high reduction potentials associated with unactivated alkyl chlorides,achieving their single electron reduction remains a persistent *** challenge has spurred the exploration of efficient activation methods to overcome this *** recent years,photocatalysis has emerged as a mild and potent tool for the single electron reduction of unactivated alkyl chlorides,opening up new possibilities in this *** the rapid advancements in this area,a comprehensive review that provides a conceptual understanding of this emerging field,with a specific focus on reaction design and catalytic mechanisms,would be timely and highly ***,we present an overview of various synthetic techniques for photoinduced single electron reduction of unactivated alkyl ***,we also discuss the limitations of the present methods and future directions that lie ahead in this field.

关键词： photocatalysis unactivated alkyl chlorides single electron transfer radical reactions

Mid-infrared atmospheric transmittance at 5100 m-altitude Ali Observatory

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2020年第8期20卷 316-322页

作者： fei-xiang wang Fang-Yu Xu Jie Guo Zhi-Jun Zhao Rui-Ting Hao Jian-Guo Xiao Yu-Chao Jia Shan-Jie Huang Yunnan Observatories Chinese Academy of SciencesKunming 650216China Yunnan Key Laboratory of Optic-electronic Information Technology Yunnan Normal UniversityKunming 650092China Yunnan KIRO-CH Photonics Co.Ltd Kunming 650217China School of Physics Henan Normal UniversityXinxiang 453007China

Ali in Tibet,5100 m above sea level,is one of the most suitable locations in the world for infrared spectral *** atmospheric transmittances at Ali Observatory and Mauna Kea Observatory were calculated by MODTRAN using radiosonde *** results were 0.848 and 0.789 respectively which indicated better conditions at Ali Observatory.A self-made instrument with a 320×256-pixel HgCdTe infrared focal plane array and a 7.5-cm diameter telescope was utilized for the actual *** the help of standard stars,the on-site and real-time atmospheric transmittance can be obtained as 0.831 by fitting the relation between the measured atmospheric radiation intensity and the zenith angle based on radiation transfer *** paper firstly reports the atmospheric transmittance in the M'band(4.605–4.755μm)at the 5100 m-altitude Ali observatory by actual *** shows that the high-altitude Ali observatory with sufficiently low water vapor content is suitable for observation in the mid-infrared bands.

关键词： infrared atmospheric effects radiation mechanisms:thermal

Geophysical prediction of organic matter abundance in source rocks based on geochemical analysis:A case study of southwestern Bozhong Sag,Bohai Sea,China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第1期21卷 31-53页

作者： xiang wang Guang-Di Liu Xiao-Lin wang Jin-Feng Ma Zhen-Liang wang fei-Long wang Ze-Zhang Song Chang-Yu Fan State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China College of Geosciences China University of Petroleum(Beijing)Beijing102249China State Key Laboratory of Continental Dynamics Northwest UniversityXi'an710069ShaanxiChina Department of Geology Northwest UniversityXi'an710069ShaanxiChina CNOOC Tianjin Branch Company Tianjin300459China

The Bozhong Sag is the largest petroliferous sag in the Bohai Bay Basin,and the source rocks of Paleogene Dongying and Shahejie Formations were buried *** of the drillings were located at the structural high,and there were few wells that met good quality source rocks,so it is difficult to evaluate the source rocks in the study area precisely by geochemical analysis *** on the Rock-Eval pyrolysis,total organic carbon(TOC)testing,the organic matter(OM)abundance of Paleogene source rocks in the southwestern Bozhong Sag were evaluated,including the lower of second member of Dongying Formation(E_(3)d2L),the third member of Dongying Formation(E_(3)d_(3)),the first and second members of Shahejie Formation(E_(2)s_(1+2)),the third member of Shahejie Formation(E_(2)s_(3)).The results indicate that the E_(2)s_(1+2)and E_(2)s_(3)have better hydrocarbon generative potentials with the highest OM abundance,the E_(3)d_(3)are of the second good quality,and the E_(3)d2L have poor to fair hydrocarbon generative ***,the well logs were applied to predict TOC and residual hydrocarbon generation potential(S_(2))based on the sedimentary facies classification,usingΔlogR,generalizedΔlogR,logging multiple linear regression and BP neural network *** various methods were compared,and the BP neural network method have relatively better prediction *** on the pre-stack simultaneous inversion(P-wave impedance,P-wave velocity and density inversion results)and the post-stack seismic attributes,the three-dimensional(3D)seismic prediction of TOC and S_(2)was carried *** results show that the seismic near well prediction results of TOC and S_(2)based on seismic multi-attributes analysis correspond well with the results of well logging methods,and the plane prediction results are identical with the sedimentary facies map in the study *** TOC and S_(2)values of E_(2)s_(1+2)and E_(2)s_(3)are higher than those in E_(3)d_(3)and E_(3)d_(2)L,basicall

关键词： Total organic carbon(TOC) Residual hydrocarbon generation potential(S_(2)) Geophysical prediction Seismic attribute Bozhong Sag Bohai Bay Basin

Practical cloud storage auditing using serverless computing

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2024年第3期67卷 33-47页

作者： fei CHEN Jianquan CAI Tao xiang Xiaofeng LIAO College of Computer Science and Software Engineering Shenzhen University College of Computer Science Chongqing University

Cloud storage auditing research is dedicated to solving the data integrity problem of outsourced storage on the cloud. In recent years, researchers have proposed various cloud storage auditing schemes using different techniques. While these studies are elegant in theory, they assume an ideal cloud storage model;that is, they assume that the cloud provides the storage and compute interfaces as required by the proposed schemes. However, this does not hold for mainstream cloud storage systems because these systems only provide read and write interfaces but not the compute interface. To bridge this gap, this work proposes a serverless computing-based cloud storage auditing system for existing mainstream cloud object storage. The proposed system leverages existing cloud storage auditing schemes as a basic building block and makes two adaptations. One is that we use the read interface of cloud object storage to support block data requests in a traditional cloud storage auditing scheme. Another is that we employ the serverless computing paradigm to support block data computation as traditionally required. Leveraging the characteristics of serverless computing, the proposed system realizes economical, pay-as-you-go cloud storage auditing. The proposed system also supports mainstream cloud storage upper layer applications(e.g., file preview) by not modifying the data formats when embedding authentication tags for later auditing. We prototyped and open-sourced the proposed system to a mainstream cloud service, i.e., Tencent Cloud. Experimental results show that the proposed system is efficient and promising for practical use. For 40 GB of data, auditing takes approximately 98 s using serverless computation. The economic cost is 120.48 CNY per year, of which serverless computing only accounts for 46%. In contrast, no existing studies reported cloud storage auditing results for real-world cloud services.

关键词： cloud storage auditing serverless computing object storage usability

Extraction of fractures in shale CT images using improved U-Net

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Energy Geoscience

Energy Geoscience 2024年第2期5卷 240-248页

作者： xiang Wu fei wang Xiaoqiu Zhang Bohua Han Qianru Liu Yonghao Zhang College of Geology Engineering and Geomatics Chang'an UniversityXi'anShaanxi710054China Qinghai Oilfield Exploration and Development Research Institute DunhuangGansu736202China China Petroleum Logging Co.Ltd. Xi'anShaanxi710077China

Accurate extraction of pores and fractures is a prerequisite for constructing digital rocks for physical property simulation and microstructural response ***,fractures in CT images are similar in grayscale to the rock matrix,and traditional algorithms have difficulty to achieve accurate segmentation *** this study,a dataset containing multiscale fracture information was constructed,and a U-Net semantic segmentation model with a scSE attention mechanism was used to classify shale CT images at the pixel level and compare the results with traditional *** results showed that the CLAHE algorithm effectively removed noise and enhanced the fracture information in the dark parts,which is beneficial for further fracture *** Canny edge detection algorithm had significant false positives and failed to recognize the internal information of the *** Otsu algorithm only extracted fractures with a significant difference from the background and was not sensitive enough for fine *** MEF algorithm enhanced the edge information of the fractures and was also sensitive to fine fractures,but it overestimated the aperture of the *** U-Net was able to identify almost all fractures with good continuity,with an MIou and Recall of 0.80 and 0.82,*** the image resolution increases,more fine fracture information can be extracted.

关键词： CT slices Fracture segmentation Shale U-Net Deep learning