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半桥式零电压开关脉宽调制直流变换器

电讯技术 1992年第6期32卷 61-67,60页

作者： ivo Barbi Hélio LeāesHey 高光明

本文介绍了一种利用脉宽调制工作在固定转换频率和零电压为特性的半桥式直流变换器。提供了工作原理、理论分析、设计过程和例子,以及实验结果。实验证明,所推荐的变换器不采用谐振的办法将功率传送到负载,它不会受到电压应力的影响,作... 详细信息

本文介绍了一种利用脉宽调制工作在固定转换频率和零电压为特性的半桥式直流变换器。提供了工作原理、理论分析、设计过程和例子,以及实验结果。实验证明,所推荐的变换器不采用谐振的办法将功率传送到负载,它不会受到电压应力的影响,作为一个普通脉宽调制变换器而被激励,只要不用隔离变压器,它适合于低直流电压变换比的应用。两台实验样机,一台有隔离输出端,另一台有非隔离输出端,都成功地得以实现了,前一种的输入电压300V,转换频率100KHz、输出功率500W,效率82.5％。

关键词：开关电源脉宽调制直流变换器

Chemistry and Biological Activity of Condamineeae Tribe: A Chemotaxonomic Contribution of Rubiaceae Family

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American Journal of Plant Sciences 2015年第16期6卷 2612-2631页

作者： Vinicius F. Moreira ivo J. C. Vieira Raimundo Braz-Filho Sector of Natural Products Chemistry Universidade Estadual do Norte Fluminense Darcy Ribeiro Campos dos Goytacazes Brazil

This study is a review of the Condamineeae tribe, through the acquisition of data from phytochemical studies and evaluation of genera activities that constitute the tribe, in order to contribute to chemotaxonomic classification of this tribe in the Rubiaceae family. This review also states the scarcity of phytochemical investigations of several genera and consequently a lot of species of family.

关键词： Biological Activity Condamineeae Chemotaxomy Phytochemistry Rubiaceae

Reconfigurable beam system for non-lineof-sight free-space optical communication

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Light(Science & Applications) 2019年第1期8卷 577-585页

作者： Zizheng Cao Xuebing Zhang Gerwin Osnabrugge Juhao Li ivo M.Vellekoop Antonius M.J.Koonen Institute for Photonic Integration Eindhoven University of TechnologyPO Box 5135600 MB Eindhoventhe Netherlands Faculty of Science and Technology University of TwenteP.O.Box 2177500 AE Enschedethe Netherlands State Key Laboratory of Advanced Optical Communication Systems and Networks Peking UniversityBeijing 100871China

In this paper,we propose a reconfigurable beam-shaping system to permit energy-efficient non-line-of-sight(NLOS)free-space optical *** is steered around obstacles blocking the direct communication pathway and reaches a receiver after reflecting off of a diffuse surface.A coherent array optical transmitter(CAO-Tx)is used to spatially shape the wavefront of the light incident on a diffuse *** shaping is used to enhance the amount of diffusely reflected light reaching the optical *** NLOS experiments for a signal reflected over an angular range of 20°are presented.A record-breaking 30-Gbit/s orthogonal frequency-division multiplexing signal is transmitted over a diffused optical wireless link with a>17-dB gain.

关键词： communication beam reflected

基于在中国品牌的建立看德国大众汽车公司整合品牌战略的发展

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基于在中国品牌的建立看德国大众汽车公司整合品牌战略的发展

作者：伊娃（ivo Banaszynski）华东理工大学

学位级别：硕士

在我的硕士论文中,我选择公司大众汽车在中国品牌发展的成功故事来说明。由于在中国汽车行业的竞争上升,大众目前正面临困难,通过创建一个品牌,建立强烈的信念和态度在消费者心目中。虽然大众已经在中国发展的某些型号和品牌,形象,忠诚... 详细信息

在我的硕士论文中,我选择公司大众汽车在中国品牌发展的成功故事来说明。由于在中国汽车行业的竞争上升,大众目前正面临困难,通过创建一个品牌,建立强烈的信念和态度在消费者心目中。虽然大众已经在中国发展的某些型号和品牌,形象,忠诚度尚未形成。因此,我要制定一个长期的大众品牌战略,基于外部市场环境,大众的品牌和中国客户的期望。我的论文的一个重要组成部分,说明了大众的品牌战略及其在中国的品牌组合。大众企业品牌以及其多品牌战略将通过内部的分析研究。因此,我分析每个品牌的特点,定位和什么样的价值观每个品牌都希望沟通的负荷消费。在外部市场分析,我会检查目前的法律,有竞争力,在中国汽车行业的技术,社会文化和经济情况。通过分析外部环境,这将是很重要的了解,这种作用,大众在政府的支持或法规,文化差异和在中国的技术进步方面发挥着。对于一个品牌战略的设计,它重要的是要知道,品牌如何吸引在消费者心目中,他们是如何影响消费者购买决策。作为我的论文的一个重要组成部分,我在中国进行的顾客调查,以确定目前中国客户的品牌协会和大众品牌在中国的形象。比较大众的内部分析和外部环境的调查,我会建议,大众如何增长和维持其品牌资产,以获得忠诚度,较高的市场份额和利润的增长,而我获得了很好地理解中国客户大众S产品品牌的内侧。

关键词：品牌管理中国汽车产业中国消费者行为大众汽车在中国的品牌战略品牌资产品牌的忠诚度

SPR Method and Its Utilisation for Low Alcohols Concentrations Determination

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Journal of Modern Physics 2015年第4期6卷 363-368页

作者： Michal Lesnák Frantisek Staněk ivo Hlavatý Jaromír Pistora Jan Procházka Institute of Physics Technical University of OstravaOstravaCzech Republic Department of Mechanical Technology Technical University of OstravaOstravaCzech Republic Nanotechnology Centre Technical University of OstravaOstravaCzech Republic Institute of Mining Engineering and Safety Technical University of OstravaOstravaCzech Republic

SPR sensor with matrix arrangement of nanostructured golden spots enables both the study of low concentrations of substances in solution and the acquisition of information on the spatial layout of the diagnosed medium in solution. The linear response of this sensor was experimentally specified for standard solutions of alcohols in a concentration range of 0.01 - 0.5 wt%. The influence of signal noise generated by carrier substance flowing through sensing dots has been removed by data processing. This approach enables to determine refractive index changes less than 3 × 10-6.

关键词： Plasmon Resonance Alcohols Concentration of Solutions

Diagnostic value of fine motor deficits in patients with low-grade hepatic encephalopathy

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World Journal of Gastroenterology 2005年第18期11卷 2777-2780页

作者： Sergei Mechtcheriakov ivo W. Graziadei Maria Rettenbacher Ingrid Schuster Hartmann Hinterhuber Wolfgang Vogel Josef Marksteiner Department of General Psychiatry Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria Department of Gastroenterology and Hepatology Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria Department of Biological Psychiatry Medical University of Innsbruck Anichstrasse 35 A-6020 Innsbruck Austria

AIM: The role of motor dysfunction in early diagnosis of low-grade hepatic encephalopathy remains uncertain. We performed a pilot study to comparatively investigate the kinematic characteristics of small and large rapid alternating movements in patients with liver cirrhosis and low-grade hepatic ***: A kinematic analysis of alternating handwriting (7.5 mm) and large drawing movements (DM, 175 mm) was performed in 30 patients with liver cirrhosis (no hepatic encephalopathy: n = 10; minimal hepatic encephalopathy: n = 9; grade I hepatic encephalopathy: n = 11; healthy controls: n = 12). The correlation between kinematic parameters, clinical neuro-psychiatric symptoms of cerebral dysfunction and the grade of encephalopathy was ***: Both movement types, handwriting and drawing, were significantly slower in cirrhotic patients. In contrast to large DM, the deterioration of handwriting movements significantly correlated with the increase of symptoms of motor dysfunction and differentiated significantly within the group of cirrhosis patients corresponding to the degree of hepatic encephalopathy. CONCLUSION: The deterioration of fine motor control is an important symptom of low-grade hepatic encephalopathy. The kinematic analysis of handwriting allows the quantitative analysis of alterations of motor function and is a possible tool for diagnostics and monitoring of motor dysfunction in patients with low-grade hepatic encephalopathy.

关键词：肝性脑病诊断方法动力功能不足肝硬化病理机制

Single balloon enteroscopy for endoscopic retrograde cholangiography in patients with Roux-en-Y hepaticojejuno anastomosis

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World Journal of Gastroenterology 2013年第44期19卷 8047-8055页

作者： Bohuslav Kianika Jan Lata ivo Novotny Petr Dítě Jirí Vaníek 2nd Clinic of Internal Medicine Department of Gastroenterology St. Anne’s University Hospital Brno 656 91 Brno Czech Republic University of Ostrava Faculty of Medicine 703 00 Ostrava Czech Republic Department of Gastroenterology Masaryk Memorial Cancer Institute 602 00 Brno Czech Republic Academic Centre of Digestive Oncology Faculty of Medicine University of Ostrava 703 00 Ostrava Czech Republic Department of Diagnostic Imaging and International Clinical Research Center (ICRC) St. Anne’s University Hospital Brno 656 91 Brno Czech Republic

AIM:To evaluate single balloon enteroscopy in diagnostic and therapeutic endoscopic retrograde cholangiography(ERC)in patients with Roux-en-Y hepaticojejunoanastomosis(HJA).METHODS:The study took place from January 2009to December 2011 and we retrospectively assessed 15patients with Roux-en-Y HJA who had signs of biliary *** total,23 ERC procedures were performed in these patients and a single balloon videoen-teroscope(Olympus SIF Q 180)was used in all of the cases.A transparent overtube was drawn over the videoenteroscope and it freely moved on the working part of the *** distal end was equipped with a silicone balloon that was inflated by air from an external pump at a pressure of≤5.4 *** technical limitations or rather the parameters of the single balloon enteroscope(working length-200 cm,diameter of the working channel-2.8 mm,absence of Albarran bridge)showed the need for special endoscopic ***:Cannulation success was reached in diagnostic ERC in 12 of 15 *** findings were normal in 1 of 12 *** in the remaining 11 patients showed some pathological *** of these(cystic bile duct dilation)was subsequently resolved *** treatment was initialized in the remaining 10 patients(5 with HJA stenosis,2 with choledocholithiasis,and 3 with both).This treatment was successful in 9 of 10 *** endoscopic therapeutic procedures included:balloon dilatation of HJA stenosis-11 times(7 patients);choledocholitiasis extraction-five times(5 patients);biliary plastic stent placement-six times(4 patients);and removal of biliary stents placed by us-six times(4 patients).The mean time of performing a single ERC was 72 *** longest procedure took 110 min and the shortest took34 *** shows that it is necessary to allow for more time in individual ***,these procedures require the presence of an *** did not observe any complications in these 15 ***

关键词： Single balloon enteroscopy Endoscopic retrograde cholangiography Roux-Y hepaticojejunoanastomosis Endoscopic diagnosis Endoscopic treatment

食物消费与肥胖—基于食物特点的消费者分层研究

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食物消费与肥胖—基于食物特点的消费者分层研究

Multidimensional assessment of neuro-psychiatric symptoms in patients with low-grade hepatic encephalopathy: A clinical rating scale

中国营养学会公共营养分会第八次会议暨中国居民膳食营养状况、营养改善与膳食相关慢性病研讨会

作者：何宇纳张晓勇 Hans Dagevos ivo van der Lans 翟凤英中国疾病预防控制中心营养与食品安全所 LEI-Wageningen University and Research Centre the Netherlands Marketing and Consumer Behaviour Group-Wageningen University and Research Centre the Netherlands

1979年,中国开始实施改革开放政策,从计划经济转向市场经济,由此带来了消费者革命。在随后的几十年的经济的快速增长,进一步刺激了消费者群体的增长,每年约有1百万的中国人进入消费者社会,估计目前中国的消费者人数约为2.4亿。随着中国... 详细信息

1979年,中国开始实施改革开放政策,从计划经济转向市场经济,由此带来了消费者革命。在随后的几十年的经济的快速增长,进一步刺激了消费者群体的增长,每年约有1百万的中国人进入消费者社会,估计目前中国的消费者人数约为2.4亿。随着中国市场的繁荣发展,市场供应丰富,在世界各地均可以发现"中国制造"的商品,中国的消费者也有越来越多的可利用的食物,包括"中国制造"和"外国进口"。由此也带来的中国消费者膳食结构及饮食行为

关键词：食物消费江南水乡肥胖率消费者分层研究

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World Journal of Gastroenterology 2005年第37期11卷 5893-5898页

作者： Sergei Mechtcheriakov ivo W Graziadei André Kugener Julia Wiedemann Chantal Galbavy Hartmann Hinterhuber Josef Marksteiner Wolfgang Vogel Department of General Psychiatry Medical University Innsbruck Austria Department of Gastroenterology and Hepatology Medical University Innsbruck Anichstrasse 35 AT-6020 Innsbruck Austria

AIM: To evaluate the feasibility of a new clinical rating scale for a standardized assessment of cirrhosis-associated neuro-psychiatric ***: Forty patients with liver cirrhosis (LC, with or without low-grade hepatic encephalopathy) were invest-igated using a clinical neuro-psychiatric rating scale based on a comprehensive list of neurological, psychomotor,cognitive, affective, behavioral symptoms, and symptoms of disturbed ***: The analysis revealed that the majority of cirrhotic patients showed, besides characteristic neurological symptoms of hepatic encephalopathy, various psychomotor,affective and bioregulatory symptoms (disturbed sleep and sexual dysfunction). Patients were impaired in the following subscales: sleep and biorhythm disorder (75.0% of patients), Parkinsonoid symptoms (25.0%), affective symptoms (17.5%), and psychomotor retardation (12.5%).The increase of total neuro-psychiatric clinical score was significantly associated with the degree of hepatic ***: This study suggests that a substantial number of patients with LC and low-grade hepatic encephalopathy manifest various clinical neuro-psychiatric symptoms. The use of a rating scale, which explores clinical dimensions of hepatic encephalopathy, would improve the management of patients with LC.

关键词：多面估价临床表现肝性脑病疾病统计