检索结果-南通市图书馆

变频器世界 2010年第10期 87-92页

作者： dejan Schreiber 赛米控

本文介绍了大功率器件在可再生能源领域的应用,并给出了部分新的设计方案。

关键词：赛米控大功率可再生能源设计提案

4K？你out了!——飞利浦PerfectKolor精准系更275P45VYKEB

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

微型计算机 2016年第17期36卷 28-29页

作者： dejan Yu

自从干了这行后，总是感叹科技的进步实在太过迅速，简直有些让人目不暇接，就拿显示器来说，大部分人还在使用着1080P分辩率的显示器，就连我这样用着2K显示器的人都不算多，

关键词：飞利浦显示器分辩率

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Spring MVC框架的高级配置

程序员 2006年第5期 94-97页

作者： dejan Bosanac

在本文中,作者将给出一些Spring MVC框架的配置技巧,这些技巧可以帮助您管理基于Sping的web应用程度的多个实例。它与任何特定技术没有直接关联,所以我们将从解释问题的基本概念开始。接下来,作者将重点讲述Spring MVC框架,差为使用此... 详细信息

在本文中,作者将给出一些Spring MVC框架的配置技巧,这些技巧可以帮助您管理基于Sping的web应用程度的多个实例。它与任何特定技术没有直接关联,所以我们将从解释问题的基本概念开始。接下来,作者将重点讲述Spring MVC框架,差为使用此项技本开发的项目提供一些解决方案。

关键词： MVC 框架配置 web应用程序技术开发

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

大功率可再生能源应用——先进的设计提案

中国新能源 2011年第4期 36-39页

作者： dejan Schreiber

在效率和可靠成为主要需要需求的今天，电力电子在可再生能源领域的应用受到巨大的挑战。今天，1700V低压硅片有很大的优势。对于MW级的输入／输出功率，需要将带有几十个芯片的几十个模块并联起来。最好的解决方案是将逆变器／电源模... 详细信息

在效率和可靠成为主要需要需求的今天，电力电子在可再生能源领域的应用受到巨大的挑战。今天，1700V低压硅片有很大的优势。对于MW级的输入／输出功率，需要将带有几十个芯片的几十个模块并联起来。最好的解决方案是将逆变器／电源模块并联，但这种方案需要额外低压传输，通过电源到中压（MV）的变压器来实现，另一种解决方案是通过将由低压硅片和功率单元进行串联，组成一个中压电网侧逆变器来实现能量传输，组成一个中压电源。此外，交错PWM减小了正弦滤波器的尺寸、降低了开关频率及总损耗。

关键词：可再生能源应用大功率电源模块设计中压电网能量传输能源领域

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

大功率可再生能源应用——最先进的设计方案

电源世界 2010年第12期 24-28页

作者： dejan Schreiber 赛米控

本文介绍了采用功率半导体器件IGBT模块的大功率风力发电系统和光伏发电系统的先进解决方案。

关键词：可再生能源风力发电光伏发电逆变器 IGBT模块

The Effect of Vanadium Content on Mechanical Properties and Structure of Self-Hardening Steel X 160C rMo 12-1

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 Mechanics Engineering and Automation 2013年第3期3卷 168-172页

作者： Aleksandar Todic dejan Cikara Tomislav Todie Branko Pejovie Milan Misic Ivica Camagie Faculty of Technical Sciences University of Pristina Kosovska Mitrovica 38220 Serbia

The aim of this research was to examine the influence of vanadium on the structure, hardness and tensile strength of X I60CrMo 12-1 self-hardened steels. It is known that vanadium affects the process of solidification of this alloy in a way that narrows temperature interval of crystallization. Vanadium, as an alloying element, moves liquidus and solidus lines toward higher temperatures, approximately for 25 to 30 ~C. In addition, vanadium forms V6C5 carbides, which, are partly distributed between present phases in the steel; carbide （Cr,Fe）7C3 and austenite. The presence of vanadium enables the formation of （Cr, Fe）23C6 carbide and its precipitation into austenite during the cooling process. In local areas around fine carbide particles, austenite is transformed into martensite, i.e., vanadium reduces remained austenite and improves steel air-hardening. Vanadium concentration over 2.5% significantly improves the impact toughness. The basic problem in the application of high alloyed Cr-Mo steels is to increase their impact toughness and thereby sustain a relatively high value of hardness. Recent studies, concerning to the chemical composition and heat treatment regime, show that it is possible to get a martensitic structure with a very small amount of retained austenite. Investigations are directed toward the testing of the influence of alloying elements such as molybdenum, manganese and especially vanadium. Vanadium has great influence to the crystallization process. With increasing of its content, the eutectic point moves toward lower carbon concentrations and the temperature interval of solidification is narrowing.

关键词： Vanadium impact toughness hardness microstructure.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

适用于风力发电机的可靠电力电子器件

电源世界 2008年第12期 27-30页

作者： dejan Schreiber 赛米控

单个IGBT摸块难以满足风力发电所需的大功率器件要求。本文阐述了采用串并联的方法提高耐压和扩大容量以满足风力发电机驱动器和大功率逆变器的要求,并对用于中压风力发电机驱动器和逆变器的IGBT摸块进行了分析,利用串并联IGBT摸块可得... 详细信息

单个IGBT摸块难以满足风力发电所需的大功率器件要求。本文阐述了采用串并联的方法提高耐压和扩大容量以满足风力发电机驱动器和大功率逆变器的要求,并对用于中压风力发电机驱动器和逆变器的IGBT摸块进行了分析,利用串并联IGBT摸块可得到更高的输出功率和效率。

关键词：风力发电逆变器 IGBT模块并联串联

A study of pulmonary embolism after abdominal surgery in patients undergoing prophylaxis

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 2009年第3期15卷 344-348页

作者： Mirko D Kerkez Dorde M ulafi Dragana D Mija Vitomir I Rankovi Nebja S Leki dejan Z Stefanovi Clinic of Surgery Institute of Digestive Diseases Clinical Center of SerbiaMedical Faculty11000 BelgradeRepublic of Serbia Clinic of Gastroenterology and Hepatology Institute of Digestive DiseasesClinical Center of SerbiaMedical Faculty11000 BelgradeRepublic of Serbia

AIM： To determine risk factors for pulmonary embolism and estimate effects and benefits of prophylaxis. METHODS： We included 78 patients who died subsequently to a pulmonary embolism after major abdominal surgery from 1985 to 2003. A first, retrospective analysis involved 41 patients who underwent elective surgery between 1985 and 1990 without receiving any prophylaxis. In the prospectively evaluated subgroup, 37 patients undergoing major surgery between 1991 and 2003 were enrolled： all of them had received a prophylaxis consisting in lowmolecular weight heparin, given subcutaneously at a dose of 2850 IU AXa/0.3 mL （body weight 〈 50 kg） or 5700 IU AXa/0.6 mL （body weight ≥ 50 kg）. RESULTS： A higher incidence of thromboembolism （43.9% and 46.34% in the two groups, respectively） was found in older patients （〉 60 years）. The incidence of pulmonary embolism after major abdominal surgery in patients who had received the prophylaxis was significantly lower compared to the subjects with the same condition who had not received any prophylaxis （P 〈 0.001, OR = 2.825; 95% CI, 1.811-4.408）. Furthermore, the incidence of pulmonary embolism after colorectal cancer surgery was significantly higher compared to incidence of pulmonary embolism after other abdominal surgical procedures. Finally, the incidence of pulmonary embolism after colorectal cancer surgery among the patients who had received the prophylaxis （11/4316, 0.26%） was significantly lower compared to subjects undergoing a surgical procedure for the same indication but without prophylaxis （10/1562, 0.64%）（P 〈 0.05, OR = 2.522; 95% Ct, 1.069-5.949）. CONCLUSION： Prophylaxis with low molecular weight heparin is highly recommended during the preoperative period in patients with diagnosis of colorectal cancer due to high risk of pulmonary embolism after elective surgery.

关键词： Pulmonary embolism Surgery Colorectal cancer Risk factor Prevention

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

全球青年应该成为气候行动的主导力量

生态文明新时代 2023年第5期 83-84页

作者： dejan llioski 欧洲青年协会

今天的年轻人面临着许多挑战。儿童和年轻人都受到当前地缘政治局势、就业前景、安全与和平,以及气候变化等全球性挑战的影响,尤其气候变化是世界儿童和年轻人面临的最大威胁之一。应对气候变化对于未来我们走上可持续道路至关重要,年... 详细信息

今天的年轻人面临着许多挑战。儿童和年轻人都受到当前地缘政治局势、就业前景、安全与和平,以及气候变化等全球性挑战的影响,尤其气候变化是世界儿童和年轻人面临的最大威胁之一。应对气候变化对于未来我们走上可持续道路至关重要,年轻人是气候行动的关键利益相关者。

关键词：就业前景气候变化全球性挑战地缘政治主导力量关键利益相关者年轻人儿童

Plasma Focus Studies in Serbia

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 Modern Physics 2014年第2期5卷 82-88页

作者： Vladimir Udovicic Nikola Veselinovic Dusan Joksimovic Radomir Banjanac Dimitrije Maletic dejan Jokovic Dragan Lukic Institute of Physics University of BelgradeBelgradeSerbia Faculty of Business Studies Megatrend UniversityBelgradeSerbia

The plasma focus experiment in Belgrade, Serbia started in the late eighties of the last century. The historical overview of the research activity on the Belgrade plasma focus device (BPFD) will be presented in this work. The special attention has been made to the present status and the future plans for the fundamental and applied research as a part of the project of the studies of rare nuclear and particle processes in nature. BPFD is intended to operate as optimized neutron source or hard X-ray source. Using Lee model code as a reference, several upgrades of BPFD must be made: better shielding against EMI pulse, rearrangement of capacitors bank so that higher repetition rate can be achieved and also faster digital acquisition system. BPFD can be used for neutron activation or production of short-living radioisotopes. These radioisotopes will have very low activity which can be analyzed in the underground Low-Background Laboratory for Nuclear Physics, Zemun. Also, we compared the obtained experimental data (neutron yield, total current waveform, working gas pressure) with the numerical simulation code (The Lee model code) to test our plasma focus machine. Comparison between neutron yield from our experimental data and neutron scaling laws and neutron yields derived from computation using the Lee Model code shows good matching, but for better verification of the code, more experimental data are needed.

关键词： Plasma Focus The Lee Model Code