检索结果-南通市图书馆

Formation mechanisms and sequence response of authigenic grain-coating chlorite: evidence from the Upper Triassic Xujiahe Formation in the southern Sichuan Basin, China

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

Petroleum Science 2016年第4期13卷 657-668页

作者： Yu Yu Liang-Biao Lin Jian gao State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Institute of Sedimentary Geology Chengdu University of Technology

Authigenic grain-coating chlorite is widely distributed in the clastic rocks of many sedimentary basins around the world. These iron minerals were mainly derived from flocculent precipitates formed when rivers flow into the ocean, especially in deltaic environments with high hydrodynamic conditions. At the same time, sandstone sequences with grain-coating chlorites also tend to have relatively high glauconite and pyrite content. EPMA composition analysis shows that glauconites with ‘‘high Al and low Fe’’ content indicate slightly to semi-saline marine environments with weak alkaline and weakly reducing conditions. By analyzing the chlorite-containing sandstone bodies of the southern Sichuan Xujiahe Formation, this study found that chlorite was mainly distributed in sedimentary microfacies, including underwater distributary channels, distributary channels, shallow lake sandstone dams, and mouth bars. Chlorite had a tendency to form in the upper parts of sandstone bodies with signs of increased base level, representing the influence of marine（lacustrine）transgression. This is believed to be influenced by megamonsoons in the Middle and Upper Yangtze Region during the Late Triassic Epoch. During periods of abundant precipitation, river discharges increased and more Fe particulates flowed into the ocean（lake）. In the meantime,increases or decreases in lake level were only affected byprecipitation for short periods of time. The sedimentary environment shifted from weakly oxidizing to weak alkaline, weakly reducing conditions as sea level increased, and Fe-rich minerals as authigenic chlorite and glauconite began to form and deposit.

关键词： Sichuan Basin Xujiahe Formation Graincoating chlorite Glauconite Pyrite

Fluorite REE characteristics of the Diyanqinamu Mo deposit,Inner Mongolia, China

在线全文

学校读者我要写书评

暂无评论

Chinese Journal Of Geochemistry 2015年第4期34卷 610-619页

作者： Long Jian Hairui Sun Jian'guo gao Faculty of Land Resource Engineering Kunming University of Science and Technology Development and Research Center of China Geological Survey National Exploration and Development Planning Technical Guidance Center in Ministry of Land and Resorces China University of Geosciences State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences

The Diyanqinamu Mo deposit, a newly discovered porphyry deposit in the northern-central part of the Great Xing'an range, Inner Mongolia, China, is characterized by widely distributed fluorite. It is important to note that almost all the fluorite that is paragenetic with molybdenite is purple. The Tb/Ca–Tb/La ratios of these purple fluorite samples show that they have a hydrothermal *** unidirectional solidification texture at the apex of the aplitic granite and the low F contents in the andesite suggest that most of F in fluorite was derived from granitic melts. These observations suggest that the fluorite was related to the magmatic-hydrothermal fluids. All the fluorite separates have consistent total REE contents with LREE-depleted, HREE-enriched, negative Eu anomaly,unapparent Ce anomaly and positive Y anomaly. These characteristics are significantly different than those of country granite, andesite and tuff whole-rock. The positive Y anomaly of the fluorite separates implies that the hydrothermal fluids migrated a long distance, as suggested by the fact that the fluorite-molybdenite veins were mostly hosted in andesite and tuff, far from the Mo ore-forming granites. The features of LREE-depleted and HREE-enriched fluorite are due to the REE-complex in the F-enriched fluids during migration. The stronger negative Eu anomaly of fluorite than those of country rocks suggests that the Eu anomaly of the original hydrothermal fluid was enhanced by the high temperature(generally above 200 or250 °C). The widespread magnetite in the studied deposit indicates that the magmatic-hydrothermal fluid was oxidized at early stage. On the other hand, the pyrite was also paragenetic, with the molybdenite and unapparent Ce anomaly implying that the hydrothermal fluid probably experienced oxygen fugacity decreasing during migration,which is important for Mo mineralization.

关键词：钼矿床稀土元素特征内蒙古萤石中国热液成因岩浆热液迁移过程

Endolymphatic sac papillary tumor： a case report

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第22期124卷 3828-3829页

作者： YU Shun-jiang CHEN Yi-dong gao Feng QIU xiao-guang CHANG Hong Department of Radiation Oncology Beijing Shijitan Hospital ＆ Peking University No. 9 Clinical College Beijing 100038 China

Endolymphatic sac papillary tumor （ELST） is an extremely rare and aggressive tumor characterized by hearing loss and temporal bone destruction. A case with clinical, imaging, pathologic and treatment data is reported and relevant literature is reviewed. A 25-year-old woman, with ELST underwent craniotomy for tumor subtotal resection, and the diagnosis was confirmed by pathologic examination. Postoperative radiotherapy consisted of 50.4 Gy/28 f was given accordingly. The patient is currently alive with no signs of tumor recurrence locally and no radiation side-effects observed after one year follow-up. Complete resection is impossible in most cases, local resection, adjuvant radiotherapy may provide favored local control. A long-term follow-up is highly advocated in consideration of its slow development course.

关键词： endolymphatic sac papillary tumor temporal bone surgery radiotherapy

QUANTITATIVE WEIGHTED BOUNDS FOR A CLASS OF SINGULAR INTEGRAL OPERATORS

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

Acta Mathematica Scientia 2019年第4期39卷 1149-1162页

作者： Wenhua gao Guoen HU School of Applied Mathematics Beijing Normal University

In this article, the authors consider the weighted bounds for the singular integral operator defined by ■where ? is homogeneous of degree zero and has vanishing moment of order one, and A is a function on Rnsuch that ?A ∈ BMO(R^n). By sparse domination, the authors obtain some quantitative weighted bounds for TAwhen ? satisfies regularity condition of Lr-Dini type for some r ∈(1, ∞).

关键词： Singular integral operator sparse domination Ap constant maximal opera tor

Energy Efficiency Optimization for D2D Communications Based on SCA and GP Method

在线全文

学校读者我要写书评

暂无评论

China Communications 2017年第3期14卷 66-74页

作者： xiaozheng gao Hangcheng Han Kai Yang Jianping An School of Information and Electronics Beijing Institute of Technology Beijing 100081 China.

In this paper, we propose an energy-efficient power control scheme for device-to-device(D2D) communications underlaying cellular networks, where multiple D2D pairs reuse the same resource blocks allocated to one cellular user. Taking the maximum allowed transmit power and the minimum data rate requirement into consideration, we formulate the energy efficiency maximization problem as a non-concave fractional programming(FP) problem and then develop a two-loop iterative algorithm to solve it. In the outer loop, we adopt Dinkelbach method to equivalently transform the FP problem into a series of parametric subtractive-form problems, and in the inner loop we solve the parametric subtractive problems based on successive convex approximation and geometric programming method to obtain the solutions satisfying the KarushKuhn-Tucker conditions. Simulation results demonstrate the validity and efficiency of the proposed scheme, and illustrate the impact of different parameters on system performance.

关键词： device-to-device(D2D) communications power control energy efficiency(EE) successive convex approximation(SCA) geometric programming(GP)

Evidence of human papilloma virus infection and its epidemiology in esophageal squamous cell carcinoma

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第9期12卷 1352-1355页

作者： Pin-Fang Yao Guang-Can Li Jin Li He-Shun Xia xiao-Ling Yang Huan-Yuan Huang You-gao Fu Rui-Qin Wang Xi-Yin Wang Ju-Wei Sha Hubei Cancer Institute Wuhan 430079 Hubei ProvinceChina College of Life Science South-center University for Nationlities Wuhan 430074 Hubei Province China Department of Pathology Hubei Cancer Hospital Wuhan 430079 Hubei Provence China Zhongxiang Chaihu Hospital Zhongxiang 431900 Hubci Province China

AIM： To look for the evidence of human papilloma virus （HPV） infection in esophageal squamous cell carcinomas （ESCC） and to investigate the potential role and epidemiology of HPV infection in the pathogenesis of esophageal carcinomas in Henan emigrants. METHODS： Papilloma virus （PV） and HPV were determined by UltrasensiveTM S-P immunohistochemistry （IHC） and in situ hybridization （ISH） in esophageal carcinoma tissues （82 cases） and the normal mucosa （40 cases）. RESULTS： IHC revealed that the positive rate of PV was 75.0%, 68.18% and 72.5% respectively while the HPV （16/18-E6） positive rate was 45.0%, 36.36%, 37.5%, respectively in esophageal carcinoma tissue specimens from Henan emigrants,the local citizens and patients in Hubei Cancer Hospital. The PV and HPV （16/18-E6） were negative in all normal esophageal mucosa specimens. No correlation was found between HPV in esophageal squamous cell carcinoma tissues and in grade 1-3 esophageal squamous cell carcinoma cells. In situ hybridization showed that the HPV （16/18） DNA positive rate was 30.0%, 31.8%, 25.0%, respectively in the 3 groups of samples. No positive hybridization signal was found in 40 normal esophageal mucosa specimens. The positive rate of HPV （16/18） DNA in the esophageal carcinoma specimens was significantly higher than that in normal mucosa specimens （P〈0.05）. The positive rate was not different among the 3 groups of esophageal carcinoma tissue specimens （P〉0.05）.CONCLUSION： HPV infection is high in esophageal carcinoma of Henan emigrants, local residents and patients in Hubei Cancer Hospital. HPV is closely related with esophageal squarnous cell carcinoma. HPV infection may play an important role in esophageal squarnous cell carcinoma.

关键词： Human papillomavirus Esophageal squamous cell carcinoma Immunohistochemistry in situ hybridization

ECOLOGICAL RESTORATION:OUR HOPE FOR THE FUTURE?

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

Chinese Geographical Science 2004年第4期14卷 361-367页

作者： WANGXu-gao LIXiu-zhen HEHongS HUYuan-man InstituteofAppliedEcology ChineseAcademyofSciencesShenyang110016P.R.China／／GraduateSchoolofChineseAcademyofSciencesBeijing100039P.R.China InstituteofAppliedEcology ChineseAcademyofSciencesShenyang110016P.R.China InstituteofAppliedEcology ChineseAcademyofSciencesShenyang110016P.R.China／／SchoolofNaturalResourcesUniversityofMissouri-ColumbiaColumbiaMO65211USA

Ecological restoration is widely employed from tens to millions of hectares in space,and from tens of days to thousands of years in time, which forces consideration of it thoroughly. We argue that three questions are the most important among the contents relevant of ecological restoration, including why, what and how to restore degraded systems. Why to restore determines whether or not the degraded ecological systems should be restored. What to restore is the goal of ecological restoration. The explicit goal of ecological restoration is necessary to guide ecological restoration workers in pursuit of excellence and prevent restoration from being swamped by purely technological activities. And how to restore means the methods and steps we should apply. To ensure the final success of ecological restoration, restored sites should be monitored and managed for long time to determine whether the selected methods are appropriate, and can be remedy better. Only to deal with these effectively, ecological restoration would be the hope for the future.

关键词： ecological restoration degraded systems ecosystem monitoring

Clinical effects of applying a tourniquet in total knee arthroplasty on blood loss

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第21期123卷 3030-3033页

作者： ZHANG Fu-jiang xiao Yu LIU Ya-bin TIAN Xu gao Zhi-guo Department of Orthopaedics Tianjin Hospital Tianjin 300211China

Background Tourniquets used during total knee arthroplasty may lead to many complications. The aim of this study was to determine perioperative blood loss and its clinical relevance in total knee replacement surgery after applying a *** From June 2009 to October 2009, 60 consecutive patients who underwent routine total knee arthroplasty were randomly divided into two groups and were treated with or without a tourniquet （30 patients/group）. There were no significant differences in patient baseline characteristics between the two groups. We compared the two groups of patients in terms of intra- and postoperative bleeding, invisible or visible bleeding, and total blood *** None of the patients showed poor wound healing, lower extremity deep venous thrombosis or other complications. The amount of blood loss during surgery was lower in the tourniquet group than in the control group （P〈0.01）. However, postoperative visible bleeding （P 〈0.05） and occult bleeding （P 〈0.05） were significantly greater in the toumiquet group than in the control group. There was no significant difference in the total amount of blood loss between the two groups （P 〉0.05）.Conclusions Tourniquet can reduce bleeding during total knee replacement surgery, but is associated with greater visible and invisible blood loss.

关键词： blood loss total knee arthroplasty tourniquet

Evaluation of ERA-Interim Monthly Temperature Data over the Tibetan Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2014年第5期11卷 1154-1168页

作者： gao Lu HAO Lu CHEN Xing-wei College of Geographical Sciences Fujian Normal University Fujian Provincial Engineering Research Center for Monitoring and Assessing Terrestrial Disasters Research Center for National Geographical Condition Monitoring and Emergency Support in the Economic Zone on the West Side of the Taiwan Strait College of Applied Meteorology Nanjing University of Information Science & Technology

In this study, surface air temperature from 75 meteorological stations above 3000 m on the Tibetan Plateau are applied for evaluation of the European Centre for Medium-range Weather Forecasts(ECMWF) third-generation reanalysis product ERA-Interim in the period of 1979-2010. High correlations ranging from 0.973 to 0.999 indicate that ERA-Interim could capture the annual cycle very well. However, an average root-meansquare error(rmse) of 3.7°C for all stations reveals that ERA-Interim could not be applied directly for the individual sites. The biases can be mainly attributed to the altitude differences between ERA-Interim grid points and stations. An elevation correction method based on monthly lapse rates is limited to reduce the bias for all stations. Generally, ERA-Interim captured the Plateau-Wide annual and seasonal climatologies very well. The spatial variance is highly related to the topographic features of the TP. The temperature increases significantly(10°C- 15°C) from the western to the eastern Tibetan Plateau for all seasons, in particular during winter and summer. A significant warming trend(0.49°C/decade) is found over the entire Tibetan Plateau using station time series from 1979-2010. ERA-Interim captures the annual warming trend with an increase rate of 0.33°C /decade very well. The observation data and ERA-Interim data both showed the largest warming trends in winter with values of 0.67°C/decade and 0.41°C/decade, respectively. We conclude that in general ERA-Interim captures the temperature trends very well and ERA-Interim is reliable for climate change investigation over the Tibetan Plateau under the premise of cautious interpretation.

关键词： Reanalysis Air temperature Warming trend Tibetan Plateau