采用固相法合成物相结构单一的KNBT陶瓷粉料,采用塑性聚合物-挤制成型法制备压电纤维素坯,研究泥料制备工艺和烧结工艺对KNBT压电纤维结构性能的影响。结果表明:真空炼泥和陈腐过程可以有效减少纤维中的孔洞,提高纤维致密度,改善其压电...采用固相法合成物相结构单一的KNBT陶瓷粉料,采用塑性聚合物-挤制成型法制备压电纤维素坯,研究泥料制备工艺和烧结工艺对KNBT压电纤维结构性能的影响。结果表明:真空炼泥和陈腐过程可以有效减少纤维中的孔洞,提高纤维致密度,改善其压电性能;采用混合气氛埋烧的烧结方式,在1110℃下烧结可以获得物相结构单一、结构致密、晶体结构良好的KNBT压电陶瓷纤维,压电纤维有效压电系数可达182 pm/V,矫顽场约为4.0 k V/mm,剩余极化强度约为25.5μC/cm^2。展开更多
Hepatitis B virus (HBV) infection is a potentially life-threatening infection that attacks the liver and can cause both acute and chronic disease. This creates a high risk of death from cirrhosis and liver cancer. Hep...Hepatitis B virus (HBV) infection is a potentially life-threatening infection that attacks the liver and can cause both acute and chronic disease. This creates a high risk of death from cirrhosis and liver cancer. Hepatitis B infection poses a major health concern globally. It is estimated that 257 million people are infected globally with 780,000 deaths reported annually. In Kenya, HBV prevalence stands at chronic states of intermediate range (5% - 7%) and high (≥8%) with regional variations. Garissa County carries a high HBV infection risk with a reported prevalence of 14.1% in pregnant women attending antenatal care (ANC) clinics. This study was carried out to determine and compare the seroprevalence of HBV among in-mates and voluntary blood donors at Garissa Main Prison and Garissa County referral hospital respectively in Garissa, Kenya. A total of 130 in-mates and 130 voluntary blood donors were sampled in this study. Serum was tested for Hepatitis B surface antigen (HBsAg) using a rapid test cassette (Amitech Diagnostics Inc.). A questionnaire was also used to collect socio-demographic factors of the study participants. Data were entered and analyzed using SPSS version 20. Majority of the study participants were males (86.9% among inmates and 95.4% among blood donors). Majority (76.2%) of the in-mates and of the donors (83.1%) were aged between 20 - 40 years while majority (51.4% of the donors and 81.5% of in mates) had only a primary school level of education. HBV seroprevalence was significantly higher among in mates compared to blood donors. Out of the total number of in-mates tested, 7 (5.4%) were HBV seropositive. Conversely, among blood donors 4 (3.1%) were seropositive. There was a significant association between HBV seropositivity and gender among both the blood donors and in-mates. There was no significant association between HBV seropositivity and both level of education and age. No data currently exists on HBV seroprevalence in Kenyan prisons and these study findings may be used as a proxy for other prisons within the country. Further studies to determine other predisposing risk factors should be conducted. Additionally, molecular studies to determine circulating HBV genotypes in this group of people and region are required.展开更多
文摘采用固相法合成物相结构单一的KNBT陶瓷粉料,采用塑性聚合物-挤制成型法制备压电纤维素坯,研究泥料制备工艺和烧结工艺对KNBT压电纤维结构性能的影响。结果表明:真空炼泥和陈腐过程可以有效减少纤维中的孔洞,提高纤维致密度,改善其压电性能;采用混合气氛埋烧的烧结方式,在1110℃下烧结可以获得物相结构单一、结构致密、晶体结构良好的KNBT压电陶瓷纤维,压电纤维有效压电系数可达182 pm/V,矫顽场约为4.0 k V/mm,剩余极化强度约为25.5μC/cm^2。
文摘Hepatitis B virus (HBV) infection is a potentially life-threatening infection that attacks the liver and can cause both acute and chronic disease. This creates a high risk of death from cirrhosis and liver cancer. Hepatitis B infection poses a major health concern globally. It is estimated that 257 million people are infected globally with 780,000 deaths reported annually. In Kenya, HBV prevalence stands at chronic states of intermediate range (5% - 7%) and high (≥8%) with regional variations. Garissa County carries a high HBV infection risk with a reported prevalence of 14.1% in pregnant women attending antenatal care (ANC) clinics. This study was carried out to determine and compare the seroprevalence of HBV among in-mates and voluntary blood donors at Garissa Main Prison and Garissa County referral hospital respectively in Garissa, Kenya. A total of 130 in-mates and 130 voluntary blood donors were sampled in this study. Serum was tested for Hepatitis B surface antigen (HBsAg) using a rapid test cassette (Amitech Diagnostics Inc.). A questionnaire was also used to collect socio-demographic factors of the study participants. Data were entered and analyzed using SPSS version 20. Majority of the study participants were males (86.9% among inmates and 95.4% among blood donors). Majority (76.2%) of the in-mates and of the donors (83.1%) were aged between 20 - 40 years while majority (51.4% of the donors and 81.5% of in mates) had only a primary school level of education. HBV seroprevalence was significantly higher among in mates compared to blood donors. Out of the total number of in-mates tested, 7 (5.4%) were HBV seropositive. Conversely, among blood donors 4 (3.1%) were seropositive. There was a significant association between HBV seropositivity and gender among both the blood donors and in-mates. There was no significant association between HBV seropositivity and both level of education and age. No data currently exists on HBV seroprevalence in Kenyan prisons and these study findings may be used as a proxy for other prisons within the country. Further studies to determine other predisposing risk factors should be conducted. Additionally, molecular studies to determine circulating HBV genotypes in this group of people and region are required.
