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排序方式: 共有219条查询结果,搜索用时 9 毫秒
1.
Yalew Dessalegn Balkeshwar Singh Aart W. van Vuure Irfan Anjum Badruddin Habtamu Beri Mohamed Hussien Gulam Mohammed Sayeed Ahmed Nazia Hossain 《Materials》2022,15(14)
Ethiopia has a large coverage of bamboo plants that are used for furniture making and house building. So far, researchers have not studied the strength of Ethiopian bamboo fibers, which are utilized for composite applications. The current study measured the strength of bamboo fibers based on various testing lengths and calculated the predictive tensile strength using a modified Weibull distribution. Moreover, the quality of the extraction machine is evaluated based on shape and sensitivity parameters. This research paper incorporates the coefficient of variation of the fiber diameters, considering the defects distribution through the length for measuring the predictive strength of the fibers. The fiber diameters were calculated using the area weight methods, which had its density measured using a Pycnometer. It has been examined that as the testing gauge length and coefficient variation of fiber diameter simultaneously increased, the tensile strength of the bamboo fibers decreased. The shape parameter, sensitivity parameter, and characteristic strength of Injibara bamboo (Y. alpina) are 6.02–7.83, 0.63, and 459–642 MPa, whereas Kombolcha bamboo (B. oldhamii) are 5.87–10.21, 0.33, and 408–638 MPa, as well as Mekaneselam bamboo (Y. alpina) are 5.86–9.63, 0.33 and 488–597 MPa, respectively. 相似文献
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Journal of Neurology - To study the agreement between self-reported trigger factors and early premonitory symptoms amongst a group of migraineurs in both spontaneous and pharmacologically provoked... 相似文献
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Tomohiro Tanaka Nazia Selzner George Therapondos Eberhard L. Renner Leslie B. Lilly 《Transplant international》2013,26(1):42-49
Recurrent hepatitis C virus (HCV) infection occurs universally and is regarded as a major cause of mortality after liver transplantation (LT) for HCV‐related end‐stage liver disease. We conducted this large, single‐center, retrospective study to ascertain the long‐term impact of virological response to treatment of recurrent hepatitis C on survival of LT recipients. From August 1987 to October 2011, 285 patients have received interferon‐based antiviral therapy for recurrent hepatitis C. Of these 285, 245 patients were enrolled in this study. One hundred and twenty‐six patients (51.4%) achieved sustained virological response (SVR). Relapsers (undetectable HCV‐RNA at end of treatment, becoming positive afterward) comprised 9.0% (22/245), and nonresponse (NR; never achieving undetectable HCV‐RNA) 39.6% (97/245). The median follow‐up after completion of antiviral treatment was 2081 days. Using Kaplan–Meier method, patients who achieved SVR were shown to have significantly better 5‐year patient survival (95.2%) than the NR group (49.9%) (P < 0.001), and a trend toward better 5‐year survival than relapsers (87.5%) (P = 0.14); relapsers had a significantly longer survival than NR group (P = 0.005). When compared with NR, SVR and relapse appeared to be significant predictors of better survival, independent of underlying characteristics. In conclusion, virological response, especially SVR, translates into markedly improved long‐term patient outcomes in patients transplanted for hepatitis C. 相似文献
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BACKGROUND: Unlike cadaveric liver transplantation, current attitudes in living donor liver transplantation (LDLT) quote increased risk factors in the potential recipient such as retransplantation, multiple previous surgeries, or preexisting recipient portal vein thrombosis (PVT) as absolute or relative contraindications to this procedure. METHODS: An international survey was performed to examine the attitude of transplant teams relative to LDLT in the setting of preexisting PVT in the potential recipient. A questionnaire was sent to a total of 80 transplant centers performing LDLT in the United States, Europe, Canada, Japan, Southeast Asia, and Australia. RESULTS: A response was obtained from 47 transplant centers (59% response rate). This included 2146 LDLT procedures that combined both left and right lobe allografts. The incidence of acute preexisting recipient PVT was 18 (0.8%) and of chronic PVT was 26 (1.2%). Thrombectomy was performed in 28 (64%), a jump graft in 13 (29.5%), and a combination of both thrombectomy and a jump graft in 2 (4.5%) cases. With reference to the presence of preexisting PVT in the potential recipient, 5 centers considered this to be an absolute contraindication (10.7%), 24 centers as a relative contraindication (51%), and 18 as not being a contraindication (38.3%) to LDLT. CONCLUSIONS: The overall response to our questionnaire reflected a cautious attitude within the transplant community. Ethical criteria pertaining to risk undertaken by a healthy donor in situations of higher recipient morbidity risk does seem to impact on the decision to undertake LDLT in this group of patients. 相似文献
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Mohammad Ali Pierre Goovaerts Nushrat Nazia M Zahirul Haq Mohammad Yunus Michael Emch 《International journal of health geographics》2006,5(1):45-11
Background
Disease maps can serve to display incidence rates geographically, to inform on public health provision about the success or failure of interventions, and to make hypothesis or to provide evidences concerning disease etiology. Poisson kriging was recently introduced to filter the noise attached to rates recorded over sparsely populated administrative units. Its benefit over simple population-weighted averages and empirical Bayesian smoothers was demonstrated by simulation studies using county-level cancer mortality rates. This paper presents the first application of Poisson kriging to the spatial interpolation of local disease rates, resulting in continuous maps of disease rate estimates and the associated prediction variance. The methodology is illustrated using cholera and dysentery data collected in a cholera endemic area (Matlab) of Bangladesh. 相似文献8.
Albu JB Kovera AJ Allen L Wainwright M Berk E Raja-Khan N Janumala I Burkey B Heshka S Gallagher D 《The American journal of clinical nutrition》2005,82(6):1210-1217
BACKGROUND: African Americans (AAs) have a higher prevalence of obesity and type 2 diabetes than do whites. Higher insulin resistance and hyperinsulinemia have been reported in adult AAs than in whites. Differences in adipose tissue and its distribution may account for these findings. OBJECTIVE: The objective was to ascertain whether differences between AA and white women in adipose tissue (AT) and skeletal muscle (SM) volumes account for ethnic differences in insulin resistance. DESIGN: We used whole-body magnetic resonance imaging to measure AT and SM volumes and used the intravenous-glucose-tolerance test to measure insulin resistance. RESULTS: AAs (n = 32) were 29-42% more insulin resistant than were whites (n = 28) after adjustment for weight and height or any AT volumes (P < 0.05). After adjustment for SM volume, the difference decreased to 19% and became nonsignificant. AAs had a 163% greater acute insulin response to glucose than did whites; this difference was significant even after adjustment for insulin sensivitity index, weight, height, and any magnetic resonance imaging measures. With respect to regional AT volumes, an association independent of race, weight, height, and SM volume was found only between increased intermuscular AT and lower insulin sensitivity index. CONCLUSIONS: Premenopausal AA women had significantly higher insulin resistance and acute insulin response to glucose than did their white counterparts. Whereas the difference in insulin resistance was partially accounted for by a greater SM volume in the AAs than in the whites, the difference in the acute insulin response to glucose was independent of any AT and SM measures and was disproportionately larger than expected according to the difference in insulin resistance. In addition, whole-body intermuscular AT was an important independent correlate of insulin resistance. 相似文献
9.
Crabtree JH Burchette RJ Siddiqi NA 《ASAIO journal (American Society for Artificial Internal Organs : 1992)》2005,51(6):743-747
An anthropometric analysis of 200 adult patients was performed to provide better guidance in catheter selection and placement. Height, weight, various abdominal wall measurements, and gender effects were analyzed. Suitability of Tenckhoff catheters with straight and preformed bends in the intercuff segment was evaluated regarding ability to produce deep pelvic position of the catheter tip and ideal exit site location. Conflicts with belt line and with skin creases and folds were recorded. Results showed that abdominal wall measurements varied widely by height and weight. Swan neck catheters with a downwardly directed external limb and exit site were significantly better suited for females (62% versus 27%, p < 0.0001). Tenckhoff catheters with straight intercuff segments with a laterally directed tunnel tract and exit site were significantly better matched to males (78% versus 30%, p < 0.0001). Neither catheter was suitable in 25% of subjects, emphasizing the need for an extended catheter system capable of remotely locating the exit site to the upper abdomen or chest without compromising pelvic position of the catheter tip. Appropriate preoperative evaluation with selection of the best suited catheter should replace the substandard practice of using a pet catheter to fit all patients and rigidly placing the insertion incision at a set location irrespective of body habitus. 相似文献
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