检索结果-南通市图书馆

The applicability and underlying factors of frequency-dependent amplitude-versus-offset(AVO)inversion

Petroleum Science 2023年第4期20卷 2075-2091页

作者： Fang Ouyang Xin-Ze Liu BinWang Zi-Duo Hu jian-Guo zhao xiu-Yi Yan Yu Zhang Yi-He Qing State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum(Beijing)Beijing102249China Institute of Earthquake Forecasting China Earthquake AdministrationBeijing100036China Yumen Oil Field Branch of CNPC Exploration and Development Research Institute JiuquanGansu735000China Northwest Branch of PetroChina Research Institute of Petroleum Exploration and Development LanzhouGansu730020China Unconventional Petroleum Research Institute China University of Petroleum(Beijing)Beijing102249China College of Chemical Engineering and Environment China University of Petroleum(Beijing)Beijing102249China

Recently,the great potential of seismic dispersion attributes in oil and gas exploration has attracted extensive *** frequency-dependent amplitude versus offset(FAVO)technology,with dispersion gradient as a hydrocarbon indicator,has developed *** on the classical AVO theory,the technology works on the assumption that elastic parameters are frequency-dependent,and implements FAVO inversion using spectral decomposition methods,so that it can take dispersive effects into account and effectively overcome the limitations of the classical ***,the factors that affect FAVO are *** this end,we construct a unified equation for FAVO inversion by combining several Zoeppritz *** study and compare two strategies respectively with(strategy 1)and without(strategy 2)velocity as inversion input *** theoretical models,we investigate the influence of various factors,such as the Zoeppritz approximation used,P-and S-wave velocity dispersion,inversion input data,the strong reflection caused by non-reservoir interfaces,and the noise level of the seismic *** results show that FAVO inversion based on different Zoeppritz approximations gives similar *** addition,the inversion results of strategy 2 are generally equivalent to that of strategy 1,which means that strategy 2 can be used to obtain dispersion attributes even if the velocity is not *** also found that the existence of non-reservoir strong reflection interface may cause significant false ***,logging,geological,and other relevant data should be fully used to prevent this undesirable *** the P-and S-wave related dispersion obtained from FAVO can be used as good indicators of a hydrocarbon reservoir,but the P-wave dispersion is more *** fact,due to the mutual coupling of P-and S-wave dispersion terms,the P-wave dispersion gradient inverted from PP reflection seismic data has a stronger hydrocarbon detection ability than

关键词： Zoeppritz approximation Dispersion gradient Frequency-dependent AVO inversion Reservoir prediction Fluid identification

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Risk factors and the prognosis of sexual dysfunction in male patients with pituitary adenomas： a multivariate analysis

引用

Asian Journal of Andrology 2018年第1期20卷 43-49页

作者： Wen-jian-Long Zhou Shun-Chang Ma Min zhao Chang Liu xiu-Dong Guan zhao-Shi Bao Gui-lun Jia Wang Jia Department of Neurosurgery Beijing Tiantan Hospital Capital Medical University Beijing 100050 China Department of Neurosurgery Beijing Fuxing Hospital Capital Medical University Beijing 100045 China Department of Neurosurgery Peking University International Hospital Beijing 102206 China Department of Neurosurgery Beijing Huairou Hospital University of Chinese Academy of Sciences Beijing 101400 China

The impact of sexual dysfunction （SD） is distressing to many male patients with pituitary adenomas which affect both physical and psychological health. The research explored to identify risk factors affecting sexual function and the prognosis of male patients with pituitary adenomas. Two hundred and fifty-four male patients, who aged between 18 and 60 （mean ± s.d. ： 44.16 ± 10.14） years and diagnosed with pituitary adenomas, were retrospectively analyzed. One hundred and fifty-nine patients （62.6%） complained of SD prior to surgery. The mean International Index of Erectile Function （IIEF-5） in patients with giant adenomas was 16.13 ± 2.51, much smaller than those with microadenomas or macroadenomas （P 〈 0.05）. All the patients showed significant improvement in terms of erectile dysfunction （ED） following surgery （P 〈 0.05）. In addition, complete resection achieved a higher degree of SD relief than partial resection. The incidence of SD in functioning pituitary adenomas （FPAs） was much higher than that in nonfunctioning pituitary adenomas （NFPAs）（P 〈 0.05）. In addition, compared with NFPAs, males with prolactinomas （82.8%） had the higher prevalence of SD and significantly improvement following surgical intervention （P 〈 0.05）. An inverse relationship was identified between decreasing testosterone levels and increasing incidence of SD before surgery （P 〈 0.05）. There was no significant difference between 6 months and 12 months after surgery in serum testosterone level （P〉 0.05）. Our results indicated that surgical therapy could be optimized for improvements in SD and that testosterone levels can be used as a sensitive indicator to predict the recovery rate of sexual function in patients with pituitary adenomas following surgery and the serum testosterone level will stay stable in 6 months after surgery.

关键词： erectile dysfunction male pituitary adenomas sexual dysfunction testosterone

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Digital watermarking algorithm based on scale-invariant feature regions in non-subsampled contourlet transform domain

引用

Journal of Systems Engineering and Electronics 2015年第6期26卷 1310-1315页

作者： jian zhao Na Zhang jian Jia Huanwei Wang School of Information Science and Technology Northwest University

Contraposing the need of the robust digital watermark for the copyright protection field, a new digital watermarking algorithm in the non-subsampled contourlet transform （NSCT） domain is proposed. The largest energy sub-band after NSCT is selected to embed watermark. The watermark is embedded into scaleinvariant feature transform （SIFT） regions. During embedding, the initial region is divided into some cirque sub-regions with the same area, and each watermark bit is embedded into one sub-region. Extensive simulation results and comparisons show that the algorithm gets a good trade-off of invisibility, robustness and capacity, thus obtaining good quality of the image while being able to effectively resist common image processing, and geometric and combo attacks, and normalized similarity is almost all reached.

关键词： multi-scale geometric analysis (MGA) non-subsampled contourlet transform (NSCT) scale-invariant featureregion.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Theoretical analysis and experimental study of an air inflated membrane structure

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第1期11卷 25-33页

作者： Jing-hai GONG xiu-ying YANG Zi-zhao ZHANG Jin-cheng zhao Department of Civil Engineering Shanghai Jiao Tong University Sharighai 200240 China

In this paper,an experimental study of an air inflated membrane was carried out based on the China National Stadium (the Bird's Nest). After the 2008 Olympic Games,it was apparent that the future use of the Bird's Nest would be enhanced if rainfall could be prevented from entering the stadium. The installation of an air inflated membrane across the opening of the steel structure was proposed as a solution to this problem. To verify the scheme,a theoretical analysis and experimental study of an air inflated membrane was carried out. Experimental and computational models were developed,form-finding was carried out using both experimental and theoretical methods,and the results from the two approaches,including the deflection of the air inflated membrane and deformation of the support structure,were analyzed and compared. The force-transfer path and deformation of the air inflated membrane under loads was studied. Conclusions and suggestions are presented.

关键词： China National Stadium Air inflated membrane Form-finding

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Degradation of 2,4-dichlorophenol with a novel TiO_2/Ti-Fe-graphite felt photoelectrocatalytic oxidation process

引用

Journal of Environmental Sciences 2007年第8期19卷 1020-1024页

作者： zhao Bao-xiu LI Xiang-zhong WANG Peng School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China. Department of Civil and Structural Engineering The Hong Kong Polytechnic of University Hunghom Kowloon Hong Kong China

Degradation of 2,4-dichlorophenol （2,4-DCP） was studied in a novel three-electrode photoelectrocatalytic （PEC） integrative oxidation process, and the factors influencing the degradation rate, such as applied current, flow speed of O2, pH, adscititious voltage and initial 2,4-DCP concentration were investigated and optimized. H2O2 was produced nearby cathode and Fe^2＋ continuously generated from Fe anode in solution when current and O2 were applied, so, main reactions, H2O2-assisted TiO2 PEC oxidation and E-Fenton reaction, occurred during degradation of 2,4-DCP in this integrative system. The degradation ratio of 2,4-DCP was 93% in this integrative oxidation process, while it was only 31% in E-Fenton process and 46% in H2O2-assisted TiO2 PEC process. So, it revealed that the degradation of 2,4-DCP was improved greatly by photoelectrical cooperation effect. By the investigation of pH, it showed that this integrative process could work well in a wide pH range from pH 3 to pH 9.

关键词： 2,4-dicholrophenol TiO2 photoelectrocatalytic hydrogen peroxide E-Fenton

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

PAM-PAA microgel inverse opal photonic crystal and pH response

引用

Chinese Chemical Letters 2007年第11期18卷 1395-1398页

作者： Yong Qiang He Xiao Dong Wang jian Ying Wang Yan Feng Yong Qiang zhao xiu Dong You School of Science Tianjin University Tianjin 300072 China Insititute of Medical Equipment Academy of Military Medical Sciences Tianjin 300161 China

The colloidal crystal template or opal with a closed-packed face-centered cubic （fcc） lattice was prepared from monodisperse polystyrene （PS） spheres by vertical sedimentation. The template provided void space for infiltration of monomer precursor composed of acrylate acid, acrylamide and ammonium-persulfate, as well as microgel from the subsequent copolymerization. The sample was immersed in dimethylbenzene for completely removing PS spheres to form PAM inverse opal hydrogels （IOHPAM） or PAM/PAA inverse opal hydrogels （IOHPAM/PAA） photonic crystals. The PS spheres were replaced by air spheres, which interconnected each other through the windows. The study of responses to pH show that there are two peaks for both IOHPAM and IOHPAM/PAA films, but the IOHPAM/PAA peaks shift to higher pH, and the peaks are independent with the AA content.

关键词： Photonic crystal pH response PAM/PAA Opal Inverse opal hydrogel

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of three-volt moxibustion with helium-neon laser irradiation on quality of care in patients with lumbar radiculopathy spondylosis

引用

World Journal of Clinical Cases 2024年第15期12卷 2522-2528页

作者： xiu-Kun Ji jian Li Department of Traditional Chinese Medicine The Second Hospital of Heilongjiang ProvinceHarbin 150028Heilongjiang ProvinceChina Departments of Four Neurology The Second Hospital of Heilongjiang ProvinceHarbin 150028Heilongjiang ProvinceChina

BACKGROUND Lumbar radiculopathy spondylosis is a relatively common orthopedic disease with a high incidence *** most commonly occurs in the lumbar 4-5 and lumbar 5-sacral 1 vertebrae,which account for approximately 95%of *** mostly occurs in people aged 30-50 years old and greatly affects their quality of *** To determine the effect of triple-voltage acupuncture combined with helium-neon laser irradiation on the quality of care and improvement of symptoms in patients with lumbar radiculopathy *** In this study,we selected 120 patients with lumbar radiculopathy spondylosis who were treated at our hospital between June 2019 to June *** patients were divided into control and observation groups according to the random number table method,with 60 patients in each *** in the observation group were treated with three-volt moxibustion combined with helium-neon laser irradiation,and those in the control group were treated with lumbar *** 1 month of treatment,the lumbar pain scores,lumbar spine motor functions,clinical treatment effects,and nursing satisfaction of the two groups were *** The results showed that acupuncture combined with laser irradiation significantly improved the patients'clinical symptoms,i.e.,reduced their low back pain,significantly lower numerical rating scale pain scores in the observation group than in the control group,and better lumbar spine motility than in the control group,compared to lumbar *** addition,they were cared *** treatment effectiveness rate of the observation group was 95.5%,which was significantly higher than that of the control group(81.67%).Satisfaction with care was higher than 90 points in both groups,but the difference was not statistically *** Our study provides a clinical rationale for the future treatment of patients with lumbar spine ***,further extensive research is needed for validation.

关键词： Moxibustion Laser irradiation Clinical rationale Lumbar spine Three-volt moxibustion

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A High Resolution Emission Inventory of Domestic Burning in Rural Region of Northeast China Based on Household Consumption

引用

Chinese Geographical Science 2020年第5期30卷 921-933页

作者： zhao Hongmei YANG Guangyi xiu Aijun ZHANG Xuelei Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of Sci-encesChangchun 130102China University of Chinese Academy of Science Bejing 100049China

Domestic burning emits large amounts of pollutants into the ambient air due to incomplete and inefficient combustion, with significant impacts on indoor air quality and human health. Northeast China is one of the major contributors to domestic burning emissions in China;however, the high-resolution emissions inventories of domestic biomass and coal burning in Northeast China are lacked, which are needed to estimate the extent of its impact. In this study, we established a town-level emissions inventory of gaseous pollutants and particulate matter(PM) from domestic biomass and coal burning, based on per household consumption in each town in rural region of Northeast China. The results revealed that biomass burning was the major domestic burning source over the region in 2016. Domestic biomass burning is the major contributor to PM and volatile organic compounds(VOCs) emissions, while coal burning is the major contributor to SO2 emissions. High emissions intensities were concentrated around the cities of Harbin, Suihua, Changchun, Qiqihar, and Chifeng, each with emissions intensity for PM2.5 and VOCs of more than 2000 Mg per 27 km × 27 km grid cell. Additionally, there are three burning peaks(6-7 am, 12 pm and 4-7 pm) during both the heating(from October to April) and non-heating seasons(from May to September), due to cooking and heating. The burning peaks in the non-heating season were more notable than those in the heating season. These results suggest that the government should pay more attention to domestic biomass and coal burning in rural areas, in order to reduce pollutant emissions and control regional haze during the heating season.

关键词： residential emission particulate matter(PM) source contribution indoor air pollution spatiotemporal distribution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

THE BULK INPUT M~[X]/M/1 QUEUE WITH WORKING VACATIONS

引用

Journal of Systems Science and Systems Engineering 2009年第3期18卷 358-368页

作者： xiu-li XU Ming-xin LIU Xiao-hua zhao College of Science Yanshan University Qinhuangdao 066004 Hebei China College of Information Science and Engineering Yanshan University Qinhuangdao 066004 Hebei China

In this paper, we analyze a bulk input M^[X]/M/1 queue with multiple working vacations. A quasi upper triangle transition probability matrix of two-dimensional Markov chain in this model is obtained, and with the matrix analysis method, highly complicated probability generating function（PGF） of the stationary queue length is firstly derived, from which we got the stochastic decomposition result for the stationary queue length which indicates the evident relationship with that of the classical M^[X]/M/1 queue without vacation. It is important that we find the upper and the lower bounds of the stationary waiting time in the Laplace transform order using the properties of the conditional Erlang distribution. Furthermore, we gain the mean queue length and the upper and the lower bounds of the mean waiting time.

关键词： M^[X]/M/1 queue bulk input multiple working vacations stochastic decomposition the Laplace transform order

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

AR assistance for efficient dynamic target search

引用

Computational Visual Media 2023年第1期9卷 177-194页

作者： Zixiang zhao jian Wu Lili Wang State Key Laboratory of Virtual Reality Technology and Systems School of Computer Science and EngineeringBeihang UniversityBeijingChina

When searching for a dynamic target in an unknown real world scene,search efficiency is greatly reduced if users lack information about the spatial structure of the *** target search studies,especially in robotics,focus on determining either the shortest path when the target’s position is known,or a strategy to find the target as quickly as possible when the target’s position is ***,the target’s position is often known intermittently in the real world,e.g.,in the case of using surveillance *** goal is to help user find a dynamic target efficiently in the real world when the target’s position is intermittently *** order to achieve this purpose,we have designed an AR guidance assistance system to provide optimal current directional guidance to users,based on searching a prediction *** assume that a certain number of depth cameras are fixed in a real scene to obtain dynamic target’s *** system automatically analyzes all possible meetings between the user and the target,and generates optimal directional guidance to help the user catch up with the target.A user study was used to evaluate our method,and its results showed that compared to free search and a top-view method,our method significantly improves target search efficiency.

关键词： augmented reality(AR) search guidance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：