144,571 research outputs found
Practical application of on-line partial discharge monitoring technique on 500kV shunt reactor
No full textConsidering the damage mechanism of oil-impregnated paper insulation in power transformers, shunt reactors and other high voltage electrical apparatus caused by partial discharge, a concept of “destructive partial discharge” is introduced in this paper. The intensity of this discharge is regarded as several thousands pico-coulomb (pC) and may cause the insulation a fatal damage. An oil-paper insulation is usually able to withstand this type of partial discharge for a period of time prior to failure. This provides engineers a time window to detect it. This paper describes an on-line partial discharge monitoring system for 500kV shunt reactors. The commission results from 3 single-phase shunt reactors either connected or disconnected to the grid showed that the on-line partial discharge detecting system has a high noise immunising ability. Two years later after the installation, a pre-warning signal was received from one shunt reactor indicating the existence of an intermittent discharge. The acoustic emission system located its position at the low end of the high voltage bushing in the oil. Dissolved gasses analysis (DGA) in the oil suggested the presence of partial discharge, as acetylene (C2H2) was as high as 20ppm. PD activity was further confirmed by a physical examination on the reactor
Pharmacoeconomic analysis of adjuvant oral capecitabine vs intravenous 5-FU/LV in Dukes' C colon cancer: the X-ACT trial
Full text linkOral capecitabine (Xeloda<sup>®</sup>) is an effective drug with favourable safety in adjuvant and metastatic colorectal cancer. Oxaliplatin-based therapy is becoming standard for Dukes' C colon cancer in patients suitable for combination therapy, but is not yet approved by the UK National Institute for Health and Clinical Excellence (NICE) in the adjuvant setting. Adjuvant capecitabine is at least as effective as 5-fluorouracil/leucovorin (5-FU/LV), with significant superiority in relapse-free survival and a trend towards improved disease-free and overall survival. We assessed the cost-effectiveness of adjuvant capecitabine from payer (UK National Health Service (NHS)) and societal perspectives. We used clinical trial data and published sources to estimate incremental direct and societal costs and gains in quality-adjusted life months (QALMs). Acquisition costs were higher for capecitabine than 5-FU/LV, but higher 5-FU/LV administration costs resulted in 57% lower chemotherapy costs for capecitabine. Capecitabine vs 5-FU/LV-associated adverse events required fewer medications and hospitalisations (cost savings £3653). Societal costs, including patient travel/time costs, were reduced by >75% with capecitabine vs 5-FU/LV (cost savings £1318), with lifetime gain in QALMs of 9 months. Medical resource utilisation is significantly decreased with capecitabine vs 5-FU/LV, with cost savings to the NHS and society. Capecitabine is also projected to increase life expectancy vs 5-FU/LV. Cost savings and better outcomes make capecitabine a preferred adjuvant therapy for Dukes' C colon cancer. This pharmacoeconomic analysis strongly supports replacing 5-FU/LV with capecitabine in the adjuvant treatment of colon cancer in the UK
Mutation frequencies following the 5-FU-, 4NQO-, and CPT-treatment.
No full textA), C), and E) The frequencies of overall Lys+ mutations following treatments with 5-FU (10 μM), CPT (100 μM), or 4NQO (0.2 μg/mL), respectively, for 24 hrs. B), D), and F) The frequencies of the uracil-dependent A>C and T>G mutations following treatments with 5-FU, CPT and 4NQO, respectively. Error bars indicate 95% confidence intervals. The number of cultures used to determine the frequencies of mutations and the numerical values of the median mutation frequencies and the confidence intervals represented as graphs in this figure are listed in S4 Table.</p
Influence of ac ageing on space charge dynamics in LDPE
No full textPolymeric materials have been widely used as insulation in power industry due to their excellent electrical properties. However, these properties deteriorate in time irreversibly when the material is subjected to electric stress. Although space charge is believed to play an important role in ac ageing, exact mechanisms are poorly understood due to very limited experimental data. In the present work efforts have been made to investigate the influence of ac ageing on space charge dynamics in low-density polyethylene (LDPE). LDPE films with 200mm were aged at 50 kV/mm at 50 Hz for various times at ambient temperature. Space charge dynamics in the samples prior to and after ageing were monitored using the pulsed electroacoustic (PEA) technique under dc electric stress. The results indicate that there is a significant amount of homocharge accumulation in the unaged sample due to charge injection. These injected charges are the captured by the deep traps originated from the interface between crystalline and amorphous regions in LDPE. Ageing under ac condition does not necessarily lead to an increase in amount of charge in the bulk but leads to an increase in mobility of charge carriers. Chemical analysis by infrared spectroscope (FTIR) reveals there are chemical changes taken place in the bulk of the material after ac ageing. It is believed that the chemical changes introduce shallow traps which promote the movement of charge carriers in the bulk. Consequently, the injected charges spread across the sample
Der Reisehut von G. B. Borsalino Fu Lazzaro & Co. Alessandria Italia, Qualita finissima, ist leichter als ein Strohhut!
No full textDER REISEHUT VON G. B. BORSALINO FU LAZZARO & CO. ALESSANDRIA ITALIA, QUALITA FINISSIMA, IST LEICHTER ALS EIN STROHHUT!
Der Reisehut von G. B. Borsalino Fu Lazzaro & Co. Alessandria Italia, Qualita finissima, ist leichter als ein Strohhut! ( -
NMR data for cyclamenols G−R
No full textThis includes the NMR data for cyclamenols G−R to be published in JNP
Note of congratulations from Jack Huang to Dr. Frank Fu, January 1, 1983
No full textA note of congratulations to Dr. Frank H. Fu (Fu Haojian) from Springfield College Alum, Jack Huang, Class of 1936, dated January 1, 1983. The card has country lane scene on the front, with a tree with pink leaves, a buttfly, and a tree with its leaves still green. There is the roof of a house just visible over the hill. It also says Congratulations. Inside is short message.Mr. Huang wrote a short personal note congratulating him for his efforts and the recent recognition by then President Ronald Reagan, or the actor as he refers to him, and saying how proud the Chinese are of him. An author of 17 textbooks and more than 100 journal articles, Frank H. Fu, G’73, DPE’75, has worked across the world in China, Canada, and the United States. Throughout his career, he has received many distinguished honors, including the Medal of Honor in 2009 by the SAR Government of Hong Kong.
Fu has held positions at institutions such as the Chinese University of Hong Kong and Springfield College, where he served as director of the International Center starting in 1978. Five years later, Fu returned to Hong Kong, but has since remained actively involved with Springfield College, participating in talks on the campus and even hosting a gathering of nearly 60 alumni in Hong Kong.
Currently, Fu is the associate vice president of Hong Kong Baptist University, where he also works as the director of the Dr. Stephen Hui Research Centre of Physical Recreation and Wellness. In addition, Fu is president of the Society of Chinese Scholars on Exercise Physiology and Fitness, chairperson of Hong Kong Coach Education Committee, a research fellow of the Research Consortium of SHAPE America, and an international fellow of the National Academy of Kinesiology
Electric field determination of polymeric dc power cable in the presence of space charge
No full textSpace charge in polymeric power cables has been previously measured by the pulsed electroacoustic (PEA) technique and its influence on electric field distribution has been estimated assuming that the conductivity is independent of electric field. In this paper we proposed a method of determining electric field distribution considering the influence of the effect of electric field on the conductivity. The cable insulation is divided into thin layers with different conductivities and space charge present in the each layer is viewed as the consequence caused by difference in conductivity. Based on the hopping conduction mechanisms, it is possible to compute electric field distribution across the cable insulation. Compared with the electric field distribution without considering change in conductivity, the new proposed method shows reduction at the maximum electric field. However, the position of the maximum electric field shifts depending on space charge distribution
Interview of Hmong immigrants Tru Hang and Fu Hang
No full textGift of Martha Aladjem Bloomfield.Hmong immigrants and Michigan residents Tru Hang and his son Fu Hang discuss agrarian life in Laos under several occupying forces, the underpinnings of the Laotian Civil War and how that changed their lives. They recall their escape to Thailand and the challenges of corruption and abuse in the Ban Vinai refugee camp. They describe how those circumstances, as well as the lack of social services for refugees in Michigan, contributed to an entrepreneurial spirit among Hmong who came to the state, contributing to the prevalence of Hmong-operated Thai and Vietnamese restaurants in the midwest United States
Space charge measurements in polymer insulated power cables using flat ground electrode PEA system
No full textThis paper describes the data processing methods used to accurately determine the space charge and electric stress distributions in dc power cables using the Pulsed Electro-Acoustic (PEA) system. Due to the coaxial geometry and the thick walled insulation of high voltage cables, factors such as divergence, attenuation and dispersion of the propagated acoustic pressure wave in the PEA can strongly influence the resultant measurements. The above factors are taken into account ensuring accurate measurements to be made. Most importantly, a method is presented to determine the electric stress profile across the insulation due to both the divergent applied field and that as a consequence of trapped charge in the bulk of the insulating material. Results of space charge measurements and the corresponding derived electric stress distributions in XLPE dc cables are presented
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