Publications by authors named "Xiwen Zheng"

Carbon-fiber-reinforced polymer (CFRP) tendons have become a viable alternative to steel cables in cable roof structures owing to their high tensile strength, low weight, and resistance to corrosion. However, the effective anchoring of CFRP tendons is a challenge because of their poor transverse mechanical properties. Therefore, the mechanical properties of CFRP tendons and a tendon-wedge assembly under transverse compression were investigated by simulating the force environment of the CFRP tendon inside an integrated-wedge anchorage.

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Three novel filamentous halophilic archaea, strains DFN5, RDMS1, and QDMS1, were isolated from the coastal saline soil samples of the intertidal zones located in different regions of Jiangsu Province, China. The colonies of these strains were pinkish-white due to the presence of white spores. These three strains are extremely halophilic and grew optimally at 35-37 °C and pH 7.

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A filamentous cell-shaped halophilic archaeon (strain AD-1) was isolated from Aiding Salt Lake, PR China. Its colonies on HCM7 agar plates were pinkish white, 1-4 mm (diameter), elevated and round. The optimum conditions for growth were observed at 42 °C, 4.

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Three extremely halophilic archaeal strains (LT55, SQT-29-1 and WLHS5) were isolated from Gobi saline soil and a salt lake, China. These strains were most related to the genera and (92.6-95.

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Six novel halophilic archaeal strains of XZYJT10, XZYJ18, XZYJT40, XZYJT49, YCN54 and LT46 were isolated from a solar saltern in Tibet, a salt lake in Shanxi, and a saline soil in Xinjiang, China. Sequence similarities of 16S rRNA and rpoB' genes among strains XZYJT10, XZYJ18, XZYJT40, XZYJT49, YCN54, LT46 and current members of Halorussus were 90.6-97.

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Three halophilic archaeal strains, NEN8, GDY88 and ZY14, were isolated from a salt lake in Tibet and coarse sea salt samples from Guangdong and Hebei, China, respectively. These strains formed three separate clades (showing 94.4-95.

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Features of the deaths caused by COPD (chronic obstructive pulmonary disease) in cancer patients remained a controversial issue. This study aimed to characterize the demographic characteristics and mortality rates of the deaths from COPD in patients with cancer. In total, 7,846,370 cancer patients aged 40 years or older in the United States were identified from the Surveillance, Epidemiology, and End Results database (1975-2016).

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Introduction: Opioid exposure during hospitalization for cesarean delivery increases the risk of new persistent opioid use. We studied the effectiveness of stepwise multimodal opioid-sparing analgesia in reducing oxycodone use during cesarean delivery hospitalization and prescriptions at discharge.

Methods: This retrospective cohort study analyzed electronic health records of consecutive cesarean delivery cases in four academic hospitals in a large metropolitan area, before and after implementation of a stepwise multimodal opioid-sparing analgesic computerized order set coupled with provider education.

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Recognition and treatment of maternal hypotension during epidural anesthesia administration for intrapartum cesarean delivery preserves maternal-fetal perfusion. A case that required quality assurance review uncovered lapses in maternal hemodynamic monitoring during the transition to intrapartum cesarean delivery anesthesia. To address this, a practice outline was designed for trainee's education describing intrapartum epidural dosing for cesarean delivery and adequate blood pressure monitoring.

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Background: Unhygienic blood collection in the early 1990s led to blood-borne infections in Central China. This study aimed to estimate human immunodeficiency virus (HIV) co-infection with hepatitis C and B viruses (HCV and HBV) and their risk factors in a rural area of Shanxi Province with a history of commercial blood donation.

Methods: A cross-sectional study was conducted in 2004.

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Objective: To assess HIV/sexually transmitted infection (STI) prevalence and associated risk factors among miners in Yunnan, China.

Methods: A cross-sectional study was conducted among 1798 miners in 2 townships of Gejiu City, Yunnan, from March to May 2006. Standardized interviewer-administered questionnaires were completed and specimens collected for HIV/STI testing.

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The strategy for monitoring HIV/AIDS in China has evolved with the epidemic. The national HIV/AIDS surveillance system was established in 1985 and sentinel surveillance started in 1995. Initially, 42 sentinel sites were established to monitor the epidemic among certain high-risk groups, including drug users, female sex workers, STD clinic attendees and long-distance truck drivers in epidemic areas.

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Objective: To learn the potential risk for human immunodeficiency virus (HIV) infection in 12 villages with a history of former paid blood donation, and to provide different measures for HIV/AIDS prevention and control.

Methods: Seven indexes were selected, including HIV sero-prevalence rates, hepatitis C virus (HCV) sero-prevalence rates, HIV/AIDS KAB (knowledge, attitude and belief), proportion of paid blood/plasma donation, risks on related behavioral information on sex and HIV/AIDS infections. Rank Sum Ratio (RSR) was performed to synthetically evaluate the potential risk of HIV infection in those 12 selected villages.

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Objective: To estimate human immunodeficiency virus (HIV)/sexually transmitted diseases (STDs) related knowledge, the prevalence and risk factors for HIV/STDs among tin miners in Gejiu, Yunnan Province.

Methods: A cross-sectional study was conducted in tin miners working at 5 mining regions from March to June 2006 in Gejiu City, Yunnan Province. A total of 1796 miners were enrolled in the study, and a standardized questionnaire was administered probing socio-demographic factors, knowledge of HIV/STDs and sexual behavior.

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Objective: To explore the epidemic characteristics of vaginal douching, human immunodeficiency virus (HIV) and other sexually transmitted diseases(STD) among female sex workers (FSWs) in Yunnan province.

Methods: FSWs were recruited to be investigated on their demographic data, drug abuse and sexual behavior, HIV/AIDS knowledge and procreation health status. Venous blood were collected to test for HIV, herpes simplex virus 2 (HSV-2) and syphilis while urine specimen was for morphine, cervical secretion for Gonorrhoea and Chlamydia trachomatis, and vaginal secretion for Trichomonas.

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Objective: To determine the sero-prevalence of and the risk factors for human immunodeficiency virus infection among residents in a former commercial blood donating community, Shanxi Province.

Methods: A community-based cross-sectional survey was conducted among all residents aged 18 - 64 years in 4 villages in a rural county of Shanxi Province. A standardized structured questionnaire was administered to collect socio-demographic, medical and risk behavioral information.

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Objective: To determine sero-prevalence of and risk factors for hepatitis C virus infection (HCV) among residents aged 18-59 years in a former commercial blood donating community, Shanxi province.

Methods: A community-based cross-sectional survey was conducted among 660 randomly selected residents aged 18-59 years from 12 villages in a rural county of Shanxi province. Structured questionnaire was administered to collect socio-demographic,medical and risk behavioral information.

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Background: Unsafe practices during illegal plasma donation in the late 1980s and early 1990s spread bloodborne infections in central China.

Methods: A cross-sectional survey of a random sample of 538 adult residents of 12 villages in rural Shanxi Province, where there had been an illegal commercial plasma-collection center, was conducted in 2003. Structured questionnaires were administered, and blood samples were tested for hepatitis C virus (HCV) antibodies.

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Background: Illegal plasma collecting activities in mid 1990s caused a large number of human immunodeficiency virus (HIV) infections in rural areas of central-eastern China. Although most of these activities have been stopped, there were few reports on secondary transmission from infected former plasma donors to their spouses and from infected mothers to their children. This study was to determine the extent of HIV infections among young children in a rural community with a large proportion of plasma donors.

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Objective: To study the human immunodeficiency virus (HIV) status through heterosexual transmission in Yining city and to provide information on effective intervention measures.

Methods: Cohort of HIV sero-discordant couples identified from 1997 to 2000 was formed. Proportional risk model was used to analyze the time of HIV sero-conversion and the related factors.

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