检索结果-南通市图书馆

SIMULATION OF PARTICLE COATING IN THE SUPERCRITICAL FLUIDIZED BED

在线全文

学校读者我要写书评

暂无评论

China Particuology 2005年第1期3卷 113-124页

作者： Carsten Vogt Ernst-Ulrich Hartge Joachim Werther gerd Brunner Technical University Hamburg-Harburg D21071 Hamburg Germany

Fluidized bed technology using supercritical carbon dioxide both as a fluidizing gas and as a solvent for the coating material makes possible the production of thin, uniform and solvent-free coatings. But operation at low fluidizing velocities, which is favorable to facilitate gas cleaning under the high pressure conditions, may lead to uneven distribution of the coating in the fluidized bed and to unstable operation due to agglomeration. Therefore a model has been developed which describes local fluid dynamics within the high pressure fluidized bed. Based on this model, the coating process is described and the distribution of the coating inside the fluidized bed is calculated. Furthermore a submodel for the calculation of local concentrations of liquid paraffin has been set up, which may be used as a basis for the prediction of agglomeration and thus stability of operation.

关键词： particle coating fluidized bed supercritical fluid fluid mechanics

Hydraulic Testing of Compacted Bentonite Used for Plug and Abandonment Operations

在线全文

学校读者我要写书评

暂无评论

Journal of Minerals and Materials Characterization and Engineering 2019年第5期7卷 261-278页

作者： Heinz-gerd Holl Center for Coal Seam Gas University of Queensland Brisbane Australia

The University of Queensland Centre for Coal Seam Gas (UQ CCSG) has investigated plugging wells with bentonite through laboratory experiments and with field trials. This paper presents the laboratory tests, which were used to investigate the stability range of plugged sections for later well plug and abandonment operation designs. The plugs were tested on a specially built well simulator facility at The University of Queensland (UQ), School of Chemical Engineering. The bentonite material used for the plug production was treated with water and 1 weight% polyvinylpyrrolidone (PVP) which acted as a binder to allow the bentonite to be pressed into a cylindrical shape suitable for dropping into vertical wells. The experiments have shown that the best performing plug/casing size combination is able to hold pressure gradients of up to 5.9 bar/m (25.9 psi/ft) after 296 days of hydration before failing. Open hole simulations on the testing facility showed surprisingly high failure pressure gradients of 21.1 bar/m (93.3 psi/ft) after 146 days of hydration. The findings of this research indicate that the use of compressed bentonite is a viable method for sealing wells, whether they can be coal seam gas wells, conventional oil and gas wells, water wells, or coal exploration wells.

关键词： Bentonite Plugs Hydraulic Testing Failure Pressure Prediction Well Abandonment

An anthropomorphic controlled hand prosthesis system

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 Zhejiang University-Science C(Computers and Electronics) 2012年第10期13卷 769-780页

作者： Hai HUANG Hong LIU Nan LI Li JIANG Da-peng YANG Lei WAN Yong-jie PANG gerd HIRZINGER National Key Laboratory of Science and Technology on Autonomous Underwater Vehicle Harbin Engineering University Harbin 150001 China State Key Laboratory of Robot and Systems Harbin Institute of Technology Harbin 150001 Chin Institute of Robotics and Mechatronics German Aerospace Center DLR Wessling 82230 Germany

Based on HIT/DLR(Harbin Institute of Technology/Deutsches Zentrum für Luft-und Raumfahrt) Prosthetic Hand II,an anthropomorphic controller is developed to help the amputees use and perceive the prosthetic hands more like people with normal physiological *** core of the anthropomorphic controller is a hierarchical control *** is composed of a top controller and a low level *** top controller has been designed both to interpret the amputee's intensions through electromyography(EMG) signals recognition and to provide the subject-prosthesis interface control with electro-cutaneous sensory feedback(ESF),while the low level controller is responsible for grasp *** control strategies include the EMG control strategy,EMG and ESF closed loop control strategy,and voice control *** EMG signal recognition,10 types of hand postures are recognized based on support vector machine(SVM).An anthropomorphic closed loop system is constructed to include the customer,sensory feedback system,EMG control system,and the prosthetic hand,so as to help the amputee perform a more successful EMG *** results suggest that the anthropomorphic controller can be used for multi-posture recognition,and that grasp with ESF is a cognitive dual process with visual and sensory *** process while outperforming the visual feedback process provides the concept of grasp force magnitude during manipulation of objects.

关键词： Anthropomorphic controller Prosthetic hand EMG recognition Electro-cutaneous sensory feedback

Optical fiber communications 3rd ed.

在线全文

学校读者我要写书评

暂无评论

Vascular Depression： Re-evaluated on the Base of Brain Metabolism in a Sample of Patients With “Organic Brain Syndromes”

丛书名： McGraw-Hill series in electrical and computer engineering. Communications and signal processing

2000年

作者： gerd Keiser

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Psychology Research 2018年第5期8卷 224-229页

作者： gerd Krüger Facharztezentrum Northwest Hospital Frankfurt am Main Germany

Mathematica for Theoretical Physics 2nd ed. 2005

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于双频正交光栅一维相移的相位测量偏折术研究

2005年

作者： gerd Baumann

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

中国激光 2015年第3期42卷 264-269页

作者：刘元坤 Evelyn Olesch 杨征 gerd Hausler 苏显渝四川大学电子信息学院光电科学技术系四川成都610065 德国埃尔兰根纽伦堡大学光、信息与光子研究所埃尔兰根91058

提出一种新的相移方法,该方法将原独立的水平和垂直一维正弦光栅集成为单幅正交正弦光栅图,再采用双频光栅相移方法,从而实现仅通过某一特定方向相移即可获取两正交相位分布,并进而计算出待测面的梯度分布并由梯度分布恢复待测表面面形... 详细信息

提出一种新的相移方法,该方法将原独立的水平和垂直一维正弦光栅集成为单幅正交正弦光栅图,再采用双频光栅相移方法,从而实现仅通过某一特定方向相移即可获取两正交相位分布,并进而计算出待测面的梯度分布并由梯度分布恢复待测表面面形。详细介绍了双频光栅相移方法,推导了相移方向与双频光栅相移的对应关系。在传统方法中,须独立投影或显示水平和垂直一维正弦光栅,且分别进行相移测量,因此共需2×N幅图像(N≥3);而在双频正交光栅相移方法中,最少需要5幅图像。当采用机械相移时,传统方法需要二维相移机构,而该方法仅需一维相移机构,因此该方法具有成本低、测量速度快、结构简单等优点。实测的眼镜片结果,验证了该方法的可行性。

关键词：测量正交光栅相移相位测量偏折术结构光照明三维成像

Light-Triggered Reactions Do Not Bias Boron Deficiency-Induced Root Inhibition of Arabidopsis Seedlings Grown in Petri Dishes

在线全文

学校读者我要写书评

暂无评论

Molecular Plant 2021年第8期14卷 1211-1214页

作者： Zhaojun Liu Ricardo Fabiano Hettwer Giehl Manuela Desiree Bienert Nicolaus von Wiren gerd Patrick Bienert Department of Physiology and Cell Biology Leibniz Institute of Plant Genetics and Crop Plant Research(IPK)06466 GaterslebenGermany Crop Physiology TUM School of Life SciencesTechnical University of Munich85354 FreisingGermany Soil Sciences TUM School of Life SciencesTechnical University of Munich85354 FreisingGermany

Dear Editor,For more than two decades,Arabidopsis thaliana plants have been routinely grown in vitro within transparent Petri dishes containing agar-based solid *** convenient to study root developmental,nutritional and morphological responses to abiotic cues and to elucidate gene functions following reverse and forward genetic approaches,this system exposes roots to light during illumination of the ***,Zheng et al.(2019)raised serious concerns whether root growth behavior and molecular root reactions in this experimental set-up are solely due to the designedly and chemically defined growth substrate composition,in their case phosphate(Pi)deficiency,or due to light-triggered reactions that are artificially-induced by exposing roots to light.

关键词： Arabidopsis roots Root

Auto immune hepatitis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第19期22卷 4651-4661页

作者： nicole mf van gerven ynto s de boer chris jj mulder carin mj van nieuwkerk gerd bouma department of gastroenterology and hepatology vu university medical centre1081 HV Amsterdam The Netherlands

To provide an update of the latest trends in epidemiology, clinical course, diagnostics, complications and treatment of auto immune hepatitis(AIH). A search ofthe MEDLINE database was performed using the search terms: "auto immune hepatitis", "clinical presentation", "symptoms", "signs", "diagnosis", "auto antibodies", "laboratory values", "serology", "histopathology", " h i s t o l o g y ", " g e n e t i c s ", "HLA g e n e s ", "non-HLA genes", "environment", "epidemiology", "prevalence", "incidence", "demographics", "complications", "HCC", "PBC", "PSC", "corticosteroid", "therapy", "treatment", "alternative treatment". English-language full-text articles and abstracts were considered. Articles included reviews, meta-analysis, prospective retrospective studies. No publication date restrictions were applied. AIH is an immune meditated progressive inflammatory liver disease that predominantly affects middle-aged females but may affect people of all ages. The clinical spectrum of AIH is wide, ranging from absent or mild symptoms to fulminant hepatic failure. The aetiology of AIH is still unknown, but is believed to occur as the consequence of an aberrant immune response towards an un-known trigger in a genetically susceptible host. In the absence of a gold standard, diagnosis is based on the combination of clinical, biochemical and histopathological criteria. Immunosuppressive treatment has been the cornerstone of treatment since the earliest description of the disease in 1950 by Waldenstr?m. Such treatment is often successful at inducing remission and generally leads to normal life expectancy. Nevertheless, there remain significant areas of unmet aetiological a clinical needs including fundamental insight in disease pathogenesis, optimal therapy, duration of treatment and treatment alternatives in those patients unresponsive to standard treatment regimens.

关键词： Auto immune hepatitis Diagnosis Liver Epidemiology Treatment