"延保服务"离我们有多远?

有关数据显示:早在2005年底,我国的电视机、电冰箱、洗衣机的社会保有量就分别达到3.5亿台、1.3亿台和1.7亿台;吸油烟机达到8000万台;空调1.17亿台;电脑和手机保有量超过2000万台     

高压加热器的运行故障分析

归纳近年全国各电厂发生的高压加热器故障情况,主要由管束爆管、水位失控、配套件发生故障及操作不当所引发.现电厂对高加的正常运行,其重视程度前所未有.这不仅因为高加投运与否直接与电厂出力和经济效益有关,而且会直接影响整个机组的安全性.因此,提出各种保障措施,确保高压加热器能高效正常地运行.     

2008华南锂电高层论坛(国际年)

2008年3月4日,第三届华南锂电高层论坛(国际年)在深圳会展中心隆重开幕.本次大会由信息产业部电信研究院、信息产业部数据通信产品质量监督检验中心和中国威尔克实验室主办,由深圳邦凯电子、IDG、深圳六方展览等联合策划承办.本届论坛以"中国锂电--从制造走向创造"为主题,同时强调"新技术、新材料、新应用",针对锂电的生存现状,通过专家的"视角"探讨今后市场的发展趋势.     

希望海信科龙是我退休前最后一个事业——访海信科龙电器股份有限公司副总裁周小天

4月17日上午九点三十分,他首次以海信科龙电器股份有限公司(以下简称海信科龙)副总裁的身份出席了在上海举办的中国家电博览会(以下简称家博会)开幕式;下午,在简单看完家博会后,他又赶赴距上     

空调、洗衣机用电机漆包线"铝代铜"进行时?

"我们正在研究并尝试使用电机漆包线铝代铜方案,现已进入小批量试产."江苏三江电器集团副总经理环剑斌称;"我们已经开发出空调用铝漆包线电机."威灵电机有关负责人表示;"我们也想在洗衣机用电机上尝试铜铝替代."无锡小天鹅华印电器有限公司有关技术人员称.     

标准促进行业发展企业仍需有所担当

产品标准是一个行业发展的基础,而标准背后则是企业强大的核心竞争力和自觉为社会、人民利益严格要求自身的决心和毅力。在国民经济发展的大环境下,与生活生产相关的每一个产业都有无数规则控制着中国产业的发展,电信,网络,钢材,饮料,物流,背后是一长窜名字摩托罗拉,英特尔,可口可乐,沃尔玛,他们就是规则的制定者。规则是什么?规则就是标准,就是不战屈人之兵。同样在中国的家电市场上,面临标     

中国火电建设发展史(2)

"中国火电建设发展史"原系"中华人民共和国电力工业史"的一部分,该书由10多位资深专家分工撰编多年,但迄今未能付梓出版。现将其中"火电建设"部分单独刊出,本刊以连载方式发表,以飨读者。写史要求实事求是,秉笔直抒,总结经验教训,探讨发展规律,以史为鉴,鉴往知来。火力发电在我国电力工业史中始终处于主导地位,在21世纪的电力发展中,火电建设仍将处于主导地位,愿全国火电建设者,不懈努力,为全面建成小康社会和实现四个现代化做出自己的贡献。     

高性价比之选日立P42E101C等离子电视

一直以来,等离子电视与液晶电视的纷争几乎从未停息过,从最初的分辨率高低对比,响应时间和屏幕拖影问题到现在的色彩画质效果、健康护眼等方面的新说法,两大平板主流极尽所能地宣传各自的优势特点。但是,随着今年以来液晶面板产能的增加,大屏幕特别是40英寸以上的高清液晶电视的价格如雪崩般降下了很多,不少品牌的产品纷纷降到了万元以内,对消费者产生了极大吸引力;而相比之下,几乎能够兼容高清信号的等离子都在万元以上,等离子电视在大屏幕领域的优势越发被削弱了。日立P42E101C等离子电视的推出无疑为现在的等离子阵营注入了一针强心剂,它一方面继承了等离子电视优异的画质显示性能,更可贵的是不到9000元人民币的价格,令这款产品成为了众多平板电视中的高性价比之选。     

传统家电企业图谋小家电市场——访广东志高空调有限公司家电营销公司总经理蔡吉强

在2007年顺德国际家电博览会上,小家电产品的展示占到极大的比重,而且值得注意的是,在众多的小家电产品企业中,不乏志高、长虹、新飞、奥克斯等以空调、彩电著称的传统家电制造商。对此,这些大家电企业都自信地认为,他们能够凭借各自的品牌效应与渠道在未来的3～5年内占领部分市场。业内人士认为,这些传统家电企业的进入能够对小家电行业的发展起到一定的作用,不过这一产业仍需要引导、提高。     

关于加强湖南电力调度管理工作的思考

在进行地区电力调度系统安全性评价、安全生产检查、班组建设座谈会和问卷调查等调研的基础上,根据电力系统安全优质经济运行的客观要求,指出电力调度应完善统一调度、分级管理的原则,实施"统一制度,统一标准,统一平台,科学考核"的管理模式.     

Coronary artery imaging

Magnetic Resonance Materials in Physics, Biology and Medicine -     

Coronary flow measurements for evaluation of patients after stent implantation

4. Conclusions In the present study breath hold MR flow measurements and MR flow measurements during free patient breathing using adaptive navigator motion correction to minimize breathing artifacts were performed in patients after stent implantation. The measurement technique was previously validated in comparison to invasive Doppler flow measurements and a good correlation was found. It was possible to determine flow non invasively in 78% of the patients. Results were reproducible after 3 months. Magnetic resonance flow measurements allow the non invasive determination of coronary blood flow velocities after stent implantation. Thus, coronary arteries which cannot be adequately visualized with MR imaging can be assessed non invasively with MR flow measurements. Further improvements and increased robustness of the technique are essential for a routine clinical use.     

Coronary MR angiography at 3T: fat suppression versus water-fat separation

Objectives

To compare Dixon water-fat suppression with spectral pre-saturation with inversion recovery (SPIR) at 3T for coronary magnetic resonance angiography (MRA) and to demonstrate the feasibility of fat suppressed coronary MRA at 3T without administration of a contrast agent.

Materials and methods

Coronary MRA with Dixon water-fat separation or with SPIR fat suppression was compared on a 3T scanner equipped with a 32-channel cardiac receiver coil. Eight healthy volunteers were examined. Contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR), right coronary artery (RCA), and left anterior descending (LAD) coronary artery sharpness and length were measured and statistically compared. Two experienced cardiologists graded the visual image quality of reformatted Dixon and SPIR images (1: poor quality to 5: excellent quality).

Results

Coronary MRA images in healthy volunteers showed improved contrast with the Dixon technique compared to SPIR (CNR _blood-fat: Dixon = 14.9 ± 2.9 and SPIR = 13.9 ± 2.1; p = 0.08, CNR _{blood-myocardium}: Dixon = 10.2 ± 2.7 and SPIR = 9.11 ± 2.6; p = 0.1). The Dixon method led to similar fat suppression (fat SNR with Dixon: 2.1 ± 0.5 vs. SPIR: 2.4 ± 1.2, p = 0.3), but resulted in significantly increased SNR of blood (blood SNR with Dixon: 19.9 ± 4.5 vs. SPIR: 15.5 ± 3.1, p < 0.05). This means the residual fat signal is slightly lower with the Dixon compared to the SIPR technique (although not significant), while the SNR of blood is significantly higher with the Dixon technique. Vessel sharpness of the RCA was similar for Dixon and SPIR (57 ± 7 % vs. 56 ± 9 %, p = 0.2), while the RCA visualized vessel length was increased compared to SPIR fat suppression (107 ± 21 vs. 101 ± 21 mm, p < 0.001). For the LAD, vessel sharpness (50 ± 13 % vs. 50 ± 7 %, p = 0.4) and vessel length (92 ± 46 vs. 90 ± 47 mm, p = 0.4) were similar with both techniques. Consequently, the Dixon technique resulted in an improved visual score of the coronary arteries in the water fat separated images of healthy subjects (RCA: 4.6 ± 0.5 vs. 4.1 ± 0.7, p = 0.01, LAD: 4.1 ± 0.7 vs. 3.5 ± 0.8, p = 0.007).

Conclusions

Dixon water-fat separation can significantly improve coronary artery image quality without the use of a contrast agent at 3T.