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地质雷达在下静游水库勘察中的应用
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作者 王建文 《科技情报开发与经济》 2007年第33期274-275,共2页
以地质雷达测试实例为例,阐述了地质雷达在下静游水库坝址区工程地质勘察中的应用,指出地质雷达能够应用于探测断层及其破碎分布、延伸情况,也能应用于岩溶发育特征及其分布深度方面的探测。
关键词 地质雷达 地质勘察 下静游水库
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腘静脉外肌袢形成术的配合体会
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作者 赖雪英 薛增金 《福建医药杂志》 CAS 1998年第3期128-129,共2页
关键词 GUO 外肌袢形成术 下静 脉功能不全
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RF MEMS Switch on Poly-Silicon Substrate
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作者 张正元 温志渝 +4 位作者 徐世六 张正番 刘玉奎 李开成 黄尚廉 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2003年第8期798-802,共5页
The improvements of the design and the compatibility with silicon IC of RF MEMS switch are presented.The compatibility with silicon IC is realized by dielectric isolation technology,and the decrease of the pull voltag... The improvements of the design and the compatibility with silicon IC of RF MEMS switch are presented.The compatibility with silicon IC is realized by dielectric isolation technology,and the decrease of the pull voltage of the switch is done by etching some holes on the metal membrane.The preliminary test results are as follows: C off and C on are 0 32pF,6pF,respectively;the pull down voltage is about 25V.The package of the RF MEMS switch is done by micro stripline,and the isolation and the insertion loss are 35dB,2dB,respectively at 1 5GHz;the switching speed is about 3μs by oscilloscope. 展开更多
关键词 RF MEMS switch pull down voltage electrostatic force metal membrane
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Classification of underwater still objects based on multi-field features and SVM 被引量:4
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作者 TIAN Jie XUE Shan-hua HUANG Hai-ning ZHANG Chun-hua 《Journal of Marine Science and Application》 2007年第1期36-40,共5页
A Support Vector Machine is used as a classifier to the automatic detection and recognition of underwater still objects. Discrimination between the objects can be transferred into different projection spaces by the pr... A Support Vector Machine is used as a classifier to the automatic detection and recognition of underwater still objects. Discrimination between the objects can be transferred into different projection spaces by the process of multi-field feature extraction. The multi-field feature vector includes time-domain, spectral, time-frequency distribution and bi-spectral features. Underwater target recognition can be considered as a problem of small sample recognition. SVM algorithm is appropriate to this kind of problems because of its outstanding generalizability. The SVM is contrasted with a Gaussian classifier and a k-nearest classifier in some experiments using real data of lake or sea trial. The experimental results indicate that SVM is better than the others two. 展开更多
关键词 underwater still objects CLASSIFICATION feature support vector machine (SVM)
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INTERVENTIONAL OR SEMI-INTERVENTIONAL TREATMENT FOR BUDD-CHIARI SYNDROME 被引量:4
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作者 张小明 汪忠镐 《Chinese Medical Sciences Journal》 CAS CSCD 2003年第2期111-115,共5页
Objective. Report the results of interventional or semi-interventional techniques for 173 patients with Budd-Chiari syndrome.Method. This group included 120 males and 53 females. The pathologic lesions composed of loc... Objective. Report the results of interventional or semi-interventional techniques for 173 patients with Budd-Chiari syndrome.Method. This group included 120 males and 53 females. The pathologic lesions composed of localized complete occlusion of inferior vena cava (IVC) (78), IVC stenosis (49), IVC membrane with a hole (37), membrane of hepatic vein (HV) (3), IVC thrombosis (4), IVC membrane with thrombosis (2) and IVC lesion with occlusion of HV (32). Treatment methods included that I: Percutaneous transinferior vena cava angioplasty (PTA) (76); II: IVC PTA with stent (59); III: Percutaneous transhepatic vein recanalization (3); IV: IVC thrombolysis through a catheter (4); V; Combined transcardiac and trans-femoral venous membranotomy and balloon dilation (22); VI: V and stent (17); VII; Stenting during radical surgery (3); VIII: Additional operation after intervention (23).Results. The immediate technique success rate for intervention was 90.1%, for the semi-intervention was 100%. The IVC pressure was reduced from 3 to 29 cmH20. Complications occurred in 8 cases. The death rate was 2.9%. A follow-up study showed the recurrence rates were 14.5% in IVC PTA group, 1.7% in IVC PTA with stent, 18.2% in combined technique without stent and no recurrence was found in other groups.Conclusion. The PTA is the first choice for localized lesions. When elastic recoil occurs, immediate stenting is suggested. The semi-interventional approach is advised for PTA failure and more complicated cases. For those with both IVC lesion and occlusion of HV, the additional operation is needed after IVC intervention. 展开更多
关键词 INTERVENTIONAL semi-interventional Budd-Chiari syndrome
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Fatal thrombotic complications of hepatic cystic compression of the inferior vena: A case report
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作者 Ting-Kai Leung Chi-Ming Lee Hsin-Chi Chen 《World Journal of Gastroenterology》 SCIE CAS CSCD 2005年第11期1728-1729,共2页
Of 5% of patients who develop liver cysts, only 10-15%of them come for medical attention, typically because of dull right upper quadrant pain, abdominal bloating or early satiety. We treated a 77-year-old female with ... Of 5% of patients who develop liver cysts, only 10-15%of them come for medical attention, typically because of dull right upper quadrant pain, abdominal bloating or early satiety. We treated a 77-year-old female with a rare complication of inferior vena cava thrombosis. The patient expired due to septic shock and multiple organ failure. 展开更多
关键词 Liver cyst Inferior vena cava thrombosis Non-parasitic cyst CELLULITIS IVC compression Sepsis
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Analysis thrombolysis with anticoagulation treatment for early stage of deep vein thrombosis in the lower extremities
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作者 刘心 张梅 +2 位作者 刘陕西 祈光裕 刘亚民 《Journal of Medical Colleges of PLA(China)》 CAS 2003年第2期99-101,共3页
Objective: To explore the effect of thrombolysis with anticoagulation treatment for early stage of deep vein thrombosis of lower extremity. Methods: The clinical data of 106 patients at the early stage of deep vein th... Objective: To explore the effect of thrombolysis with anticoagulation treatment for early stage of deep vein thrombosis of lower extremity. Methods: The clinical data of 106 patients at the early stage of deep vein thrombosis (DVT) in the lower extremities treated by thrombolysis with anticoagulation and dispersion drugs were analyzed retrospectively. Results: The thrombolytic effect was significant. After treatment, the deep veins were recanalized without regurgitation in 75.3% of the patients. The total effective rate was 100%. Only three patients had hemorrhagic complication, but none of the patients died. Conclusion: Thrombolysis with anticoagulation treatment is an effective and safe method for DVT at the early stage. 展开更多
关键词 deep venous thrombosis lower extremity vena anticoagulation treatment
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Visual improvement in an adult amblyopic eye following branch retinal vein occlusion in non-amblyopic eye
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作者 Yang Hong Yu Tao Cheng Shaojun, Meng Xiaohong 《Journal of Medical Colleges of PLA(China)》 CAS 2012年第2期120-124,共5页
Objective:To report a case of anisometropic amblyopia reversal as a result of branch retinal vein occlusion (BRVO) occurring in the sound fellow eye.Methods:An adult patient with childhood anisometropic amblyopia was ... Objective:To report a case of anisometropic amblyopia reversal as a result of branch retinal vein occlusion (BRVO) occurring in the sound fellow eye.Methods:An adult patient with childhood anisometropic amblyopia was found to exhibit gradually visual acuity improvement in the amblyopic eye as the result of decreased visual acuity in the sound fellow eye.Results:Four years after the BRVO,the patient subsequently regained normal vision in the previously amblyopic eye.Conclusion:Visual plasticity is preserved in adults but may require special or stronger stimulation and possibly longer treatment time than during childhood. 展开更多
关键词 Adult amblyopia TREATMENT Visual cortex plasticity
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Influence of Hydrostatic Pressure on Compressive Strength of Self-consolidating Concrete
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作者 Elzbieta Horszczaruk Piotr Brzozowski +1 位作者 Grzegorz Adamczewski Tomasz Rudnicki 《Journal of Civil Engineering and Architecture》 2014年第12期1549-1555,共7页
The design of unique chamber, in which the SCUWC (self-consolidating underwater concrete) can be tested under the impact of the hydrostatic pressure from 0.1 MPa to 0.5 MPa, is presented in the paper. The results of... The design of unique chamber, in which the SCUWC (self-consolidating underwater concrete) can be tested under the impact of the hydrostatic pressure from 0.1 MPa to 0.5 MPa, is presented in the paper. The results of the preliminary tests of the effect of the hydrostatic pressure on the compressive strength of SCUWC were shown. The impact of the hydrostatic pressure on the compressive strength values of test specimens has been confirmed. There has been an increase in the strength of the specimens taken from the upper parts of the concrete samples. As it can be seen from the preliminary research, the differences in compressive strength are related to the differences that occur in the size and distribution of air voids in the samples taken from upper and lower parts of the test specimens. On the basis of the carried out investigations of the compressive strength, it can be concluded that the hydrostatic pressure has a favorable effect on the compressive strength of the tested specimens of SCUWC. Increase of the compressive strength is observed mostly in the upper layers of the samples. Preliminary analysis of the quantity and distribution of air pores in the samples of concrete subjected to pressure 0.5 MPa confirms the positive impact of the hydrostatic pressure on the layers close to the surface indicated by the absence of large air voids above 1,500μm and by reducing the quantity of air pores of size above 300μm. 展开更多
关键词 Compressive strength hydrostatic pressure self-consolidating concrete underwater concrete air voids.
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Impact of misplaced subclavian vein catheter into jugular vein on transpulmonary thermodilution measurement variables 被引量:2
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作者 Wen-qiao YU Yun ZHANG +4 位作者 Shao-yang ZHANG Zhong-yan LIANG Shui-qiao FU Jia XU Ting-bo LIANG 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2016年第1期60-66,共7页
Objective: The subclavian vein (SCV) is usually used to inject the indicator of cold saline for a transpul- monary thermodilution (TPTD) measurement. The SCV catheter being misplaced into the internal jugular (... Objective: The subclavian vein (SCV) is usually used to inject the indicator of cold saline for a transpul- monary thermodilution (TPTD) measurement. The SCV catheter being misplaced into the internal jugular (IJV) vein is a common occurrence. The present study explores the influence of a misplaced SCV catheter on TPTD variables. Methods: Thirteen severe acute pancreatitis (SAP) patients with malposition of the SCV catheter were enrolled in this study. TPTD variables including cardiac index (CI), global end-diastolic volume index (GEDVI), intrathoracic blood volume index (ITBVI), and extravascular lung water index (EVLWl) were obtained after injection of cold saline via the misplaced SCV catheter. Then, the misplaced SCV catheter was removed and IJV access was constructed for a further set of TPTD variables. Comparisons were made between the TPTD results measured through the IJV and mis- placed SCV accesses. Results: A total of 104 measurements were made from TPTD curves after injection of cold saline via the IJV and misplaced SCV accesses. Bland-Altman analysis demonstrated an overestimation of +111.40 ml/m2 (limits of agreement: 6.13 and 216.70 ml/m2) for GEDVI and ITBVI after a misplaced SCV injection. There were no significant influences on CI and EVLWI. The biases of +0.17 L/(min.m2) for CI and +0.17 ml/kg for EVLWI were re- vealed by Bland-Altman analysis. Conclusions: The malposition of an SCV catheter does influence the accuracy of TPTD variables, especially GEDVI and ITBVI. The position of the SCV catheter should be confirmed by chest X-ray in order to make good use of the TPTD measurements. 展开更多
关键词 Transpulmonary thermodUution Jugular vein catheter Misplaced subclavian vein catheter Severe acutepancreatitis
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Energy Bounds for Static Spherically Symmetric Spacetime in f(R, G) Gravity
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作者 M.Farasat Shamir Ayesha Komal 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第8期190-196,共7页
The main purpose of this paper is to investigate energy bounds in the context of f(R, G) gravity. To meet this aim, we choose static spherically symmetric spacetime in f(R, G) gravity to develop the field equations. W... The main purpose of this paper is to investigate energy bounds in the context of f(R, G) gravity. To meet this aim, we choose static spherically symmetric spacetime in f(R, G) gravity to develop the field equations. We select three different models of f(R, G) gravity, which are thoroughly discussed in the literature. Firstly, the inequalities are formulated using energy bounds and then viability of the considered models are checked respectively. Graphical analysis show that specific f(R, G) gravity models are satisfied under suitable values of model parameters. It is shown that in a certain case energy bounds are satisfied expect SEC, which supports the late time acceleration expansion of unverse. 展开更多
关键词 energy bounds f(R G) gravity
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Progress of Jinping Underground laboratory for Nuclear Astrophysics(JUNA) 被引量:8
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作者 WeiPing Liu ZhiHong Li +61 位作者 JiangJun He XiaoDong Tang Gang Lian Zhu An JianJun Chang Han Chen QingHao Chen XiongJun Chen ZhiJun Chen BaoQun Cui XianChao Du ChangBo Fu Lin Gan Bing Guo GuoZhu He Alexander Heger SuQing Hou HanXiong Huang Ning Huang BaoLu Jia LiYang Jiang Shigeru Kubono JianMin Li KuoAng Li Tao Li YunJu Li Maria Lugaro XiaoBing Luo HongYi Ma ShaoBo Ma DongMing Mei YongZhong Qian JiuChang Qin Jie Ren YangPing Shen Jun Su LiangTing Sun WanPeng Tan Isao Tanihata Shuo Wang Peng Wang YouBao Wang Qi Wu ShiWei Xu ShengQuan Yan LiTao Yang Yao Yang XiangQing Yu Qian Yue Sheng Zeng HuanYu Zhang Hui Zhang LiYong Zhang NingTao Zhang QiWei Zhang Tao Zhang XiaoPeng Zhang XueZhen Zhang ZiMing Zhang Wei Zhao Zuo Zhao Chao Zhou 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2016年第4期1-7,共7页
Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to dire... Jinping Underground laboratory for Nuclear Astrophysics(JUNA) will take the advantage of the ultra-low background of CJPL lab and high current accelerator based on an ECR source and a highly sensitive detector to directly study for the first time a number of crucial reactions occurring at their relevant stellar energies during the evolution of hydrostatic stars. In its first phase, JUNA aims at the direct measurements of^(25)Mg(p,γ)^(26)Al,^(19)F(p,α)^(16)O,^(13)C(α,n)^(16)O and ^(12)C(α,γ)^(16)O reactions. The experimental setup,which includes an accelerator system with high stability and high intensity, a detector system, and a shielding material with low background, will be established during the above research. The current progress of JUNA will be given. 展开更多
关键词 direct measurement underground laboratory (25)Mg(p γ)(26)Al (19)F(p α)(16)O (13)C(α n)(16)O and (12)C(α γ)(16)O reactions Gamow window JUNA
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Pushover analysis of underground structures:Method and application 被引量:20
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作者 LIU JingBo WANG WenHui DASGUPTA Gautam 《Science China(Technological Sciences)》 SCIE EI CAS 2014年第2期423-437,共15页
Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic demand.Considering that traditional pushover analysis is restricted in underground structures due ... Pushover analysis is common because of its conceptual simplicity and computational attractiveness in computing seismic demand.Considering that traditional pushover analysis is restricted in underground structures due to the stark differences in the seismic response characteristics of surface structures,this paper proposes a pushover analysis method for underground structures and its application in seismic damage assessment.First,three types of force distribution are presented based on ground response analysis.Next,the target displacements and analysis models are established according to force-based and performance-based design.Then,the pushover analysis procedure for underground structures is described.Next,the applicability of pushover analysis to underground structures is verified by comparing the responses of a Chongwenmen subway station determined by the proposed procedure and by nonlinear response history analysis.In addition,two other points are made:that the inverted triangular distribution of effective earthquake acceleration is more practical than the other two distributions,and that performance-based design is more effective than force-based design.Finally,a cyclic reversal loading pattern based on one cycle of reversal loads as an earthquake event is presented and applied to the seismic damage assessment of underground structures.The results show that the proposed pushover analysis can be effectively applied to the seismic design and damage assessment of underground structures. 展开更多
关键词 underground structure pushover analysis seismic demand seismic damage assessment
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