1,369 research outputs found
Factors associated with HIV serodiscordance among couples in Mozambique: Comparison of the 2009 INSIDA and 2015 IMASIDA surveys
No full textRecent studies suggest that a large proportion of new HIV-1 infections in mature epidemics occurs within discordant couples, making discordancy a major contributor to the spread of HIV/AIDS in Africa. This paper aims at assessing changes over a five-year period (2009-2015) on the (risk) factors associated with HIV serodiscordance among couples in Mozambique, using cross-sectional data from the INSIDA and IMASIDA surveys. The pooled data of both surveys were analyzed using a joint model for three parameters characterizing in a particular way disagreement and sero(con/dis)corance between the HIV statuses of couples, as introduced by Aerts et al.: the probability that the female partner is HIV positive, given that both partners differ in their HIV status, the probability that only one partner is HIV positive, given that at least one of the two partners is positive ("positive" serodiscordance), and the probability that both partners are negative given that at most one of the two partners is positive ("negative" seroconcordance). The results reveal similar significant factors and estimates as in Aerts et al. (HIV prevalence, union number for woman, STI for man, condom use by woman and wealth index), but the additional significant factors "condom use by man" (no use had a negative effect on the positive serodiscordance) and "union number for man" (for couples where the man has been married or co-habiting with a woman before had a decreased negative seroconcordance) were identified. The only factor that had a different effect over time (IMASIDA as compared to INSIDA) was the effect of "HIV prevalence of province" on the negative seroconcordance. The negative effect of a higher HIV prevalence was less pronounced in 2015 for negative seroconcordance.This study was financially supported by the Flemish Interuniversity Council (VLIR-UOS) in collaboration with Eduardo Mondlane University (UEM) through the DESAFIO Program, in Mozambique to AJCJ.Juga, AJC (corresponding author), Eduardo Mondlane Univ, Fac Sci, Dept Math & Informat, Maputo, Mozambique; Hasselt Univ, Data Sci Inst, I BioStat, Diepenbeek, Belgium.
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Valorization of hydrothermal liquefaction aqueous phase via bio-electro-chemical processes
No full textSubmission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-08-01The student, Zixin Wang, accepted the attached license on 2024-07-10 at 16:46.The student, Zixin Wang, submitted this Dissertation for approval on 2024-07-10 at 17:31.This Dissertation was approved for publication on 2024-07-12 at 10:14.DSpace SAF Submission Ingestion Package generated from Vireo submission #21053 on 2025-02-04 at 21:25:50Hydrothermal liquefaction (HTL) is a promising approach for converting wet biomass into biocrude oil, which can serve as a precursor for the production of transportation fuel and valuable chemicals. However, an inevitable byproduct of HTL process is the post-HTL aqueous phase (HTL-AP), which is a waste stream containing toxins and pollutants that must be mitigated before discharge. On the other hand, HTL-AP is rich in nutrient and energy contents that can be recovered for reuse. Approximately 20-40% of the total energy from the original biomass remains in the HTL-AP, presenting a huge potential for valorization. This study explored different treatment approaches, including biological and electrochemical, to elucidate the potential of the HTL-AP valorization. The first approach involved anaerobic digestion (AD) of HTL-AP with the presence of biochar. Adding biochar to AD was reported to facilitate the digestion, but its role has not been explicitly determined. The added biochar could promote direct interspecies electron transfer (DIET), while the adsorption and detoxification effects of biochar cannot be overlooked. Results showed that the total pore volume and adsorption capacity of biochar played the most influential role. DIET was very likely not dominant since the limited electrical conductivity and electron-donating/accepting capacities of biochar. The microbial analysis further indicated that mediated interspecies electron transfer remained as the primary mechanism rather than DIET. The addition of facilitative biochar enriched Thermovirga and Methanosaeta, whereas a suppressive biochar can promote activities of microbes such as Asaccharospora, Clostridium, and Methanobacterium. The second approach involved two stage fermentation of HTL-AP with crude glycerol as the co-substrate. Compared with single stage, the biogas production from two stage mono-fermentation of HTL-AP was improved by 25.5%, and it was further increased to 1.85 times when crude glycerol was added at a ratio of 1:1 with HTL-AP. The addition of co-substrate crude glycerol helped relieve the acidic stress, adjust the nutrient supply, and dilute the concentration of toxic chemicals in HTL-AP. The initial pH of the fermentation was also controlled, with the highest hydrogen production achieved at an initial pH of 5.5. The pH control optimized the metabolic pathways during the first stage of hydrogen production and provided desirable intermediates for the second stage of methanogenesis. Accompanied with the enhanced biogas yield, the organic conversion, energy generation, and energy recovery from two stage co-fermentation were improved by 48.6%, 84.9%, and 40.1% compared to single stage fermentation, respectively. The third approach involved the electrochemical oxidation of HTL-AP under four different current densities to degrade the organics and generate the clean energy – hydrogen, and the electrodialysis to separate and recover the nutrients from HTL-AP. At the current density of 0.15 A/cm2, the anodic COD removal efficiency reached 76.49% with acetic acid accounting for over 75% of the remaining COD after 8 hours of electrooxidation. Nitrogen compounds were also efficiently decomposed into nitrate and ammonia: at low current density of 0.025 A/cm2, ammonia accumulation in the catholyte was detected via the diffusion of ammonia from anode to cathode under the acidic environment; while at high current densities, nitrate was generated via the efficient oxidation process. Electrodialysis facilitated the further recovery of anions in the post-oxidation HTL-AP that all the phosphorus and nitrate were separated and collected in the anolyte with KH2PO4, making the solution suitable for fertilizer production. The current efficiency of COD removal and energy efficiency of hydrogen production could achieve their highest at 87.82% and 23.14%, respectively. These results demonstrated that the coupling of electrooxidation and electrodialysis could benefit the enrichment and refinement of acetic acids as well as the recovery of various nutrients, including phosphorus, nitrogen, and potassium, from the HTL-AP which can be further used for the production of several valuable chemicals and fertilizers. Additionally, production of the high purity hydrogen can be utilized for biocrude upgrading via hydrocracking, integrating downstream HTL-AP treatment with upstream HTL as a complete waste valorization system. Findings of this study contributed to the sustainable and economically viable approaches for wastewater treatment and resource recovery in HTL processes. By optimizing HTL-AP valorization through various pathways, this study enhanced the efficiency and environmental impacts of HTL technology, promoting its wider adoption for biomass conversion
Ying yong bao pi huan qie shou shu zuo wei yu fang Zhongguo nan xing xing bing huan zhe HIV gan ran de sheng wu yi xue gan yu shou duan: yi xiang ke jie shou xing yan jiu ji yi xiang ce shi gai nian de lin chuang shi yan
No full textWang, Zixin.Thesis (Ph.D.)--Chinese University of Hong Kong, 2013.Includes bibliographical references (leaves 215-223).Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.Abstract and appendixes also in Chinese
Compare HIV/syphilis infections between age groups and explore associated factors of HIV/syphilis co-infections among men who have sex with men in Shenzhen, China, from 2009 to 2017
Full text linkThe aim of this study is to assess the HIV/syphilis epidemic among men who have sex with men (MSM) aged P</div
JCB903697 Supplemental Material - Supplemental material for Selective intra-arterial brain cooling improves long-term outcomes in a non-human primate model of embolic stroke: Efficacy depending on reperfusion status
No full textSupplemental material, JCB903697 Supplemental Material for Selective intra-arterial brain cooling improves long-term outcomes in a non-human primate model of embolic stroke: Efficacy depending on reperfusion status by Di Wu, Jian Chen, Mohammed Hussain, Longfei Wu, Jingfei Shi, Chuanjie Wu, Yanhui Ma, Mo Zhang, Qi Yang, Yongjuan Fu, Yunxia Duan, Cui Ma, Feng Yan, Zixin Zhu, Xiaoduo He, Tianqi Yao, Ming Song, Xinglong Zhi, Chunxiu Wang, Lipeng Cai, Chuanhui Li, Shengli Li, Yongbiao Zhang, Yuchuan Ding and Xunming Ji in Journal of Cerebral Blood Flow & Metabolism</p
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Ethnic Classification
No full textAccording to the discussion conducted by Dashdawa Mongol representatives in the video, they have always been officially recognised as Mongol since the Qing period till today. During the Cultural Revolution, however, under pressure, many Mongols changed their nationality registration to Han Nationality. Kou Zixin is one of the people who changed their nationality register, but he wants to change it back to Mongolian. He says it is a complicated process requiring a lot of certification. Wang Yanhong, however, successfully restored his nationality to Mongolian, which now appears on his ID card
tan0101/Commercial_WGS2023: Baker et al. 2023 Nature Communications
No full text<p>This repository contains the code supporting:</p>
<p>"Convergence of resistance and evolutionary responses in Escherichia coli and Salmonella enterica co-inhabiting chicken farms in China" by Michelle Baker, Xibin Zhang, Alexandre Maciel-Guerra, Kubra Babaarslan, Yinping Dong, Wei Wang, Yujie Hu, David Renney, Longhai Liu, Hui Li, Muhammad Hossain, Stephan Heeb, Zhiqin Tong, Nicole Pearcy, Meimei Zhang, Yingzhi Geng, Li Zhao, Zhihui Hao, Nicola Senin, Junshi Chen, Zixin Peng, Fengqin Li, and Tania Dottorini</p>
<p>https://github.com/tan0101/Commercial_WGS2023/commits/v1.0.0</p>
Protective Effect of Panax notoginseng Extract Fermented by Four Different Saccharomyces cerevisiae Strains on H2O2 Induced Oxidative Stress in Skin Fibroblasts
No full textZiwen Wang,1,2 Jiaxuan Fang,1,2 Shigao Zu,1,2 Qianru Sun,1,2 Zixin Song,1,2 Jiman Geng,1,2 Dongdong Wang,1,2 Meng Li,1,2 Changtao Wang1,2 1Beijing Key Laboratory of Plant Resource Research and Development, Beijing Technology and Business University, Beijing, 100048, People’s Republic of China; 2School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing, 100048, People’s Republic of ChinaCorrespondence: Dongdong Wang; Changtao Wang, Beijing Technology and Business University, Beijing, 100048, People’s Republic of China, Tel/Fax +86 158 1135 7756, Email [email protected]; [email protected]: To produce Panax notoginseng extract as a cosmetic ingredient through Saccharomyces cerevisiae fermentation.Methods: We first compared the total sugar content, polysaccharide content, reducing sugar content, total phenolic content, total saponin content, DPPH free radical, ABTS free radical, hydroxyl free radical scavenging ability and ferric reducing antioxidant power (FRAP) of Panax notoginseng fermented extract (pnFE) and unfermented extract (pnWE). Their potential correlations were analyzed by Pearson’s correlation analysis. Then, the oxidative stress model of H2O2-induced MSFs was used to evaluate the effects of different pnFE on MSF viability, reactive oxygen species (ROS), malondialdehyde (MDA), and the activities of catalase (CAT), glutathione peroxidase (GSH-Px) and superoxide dismutase (SOD) to explore their protective effects on MSFs subjected to H2O2-induced cellular oxidative damage. Finally, their safety and stability were evaluated by using the red blood cell (RBC) test and hen’s egg test-chorioallantoic membrane (HET-CAM) assay, and changes in pH and content of soluble solids, respectively.Results: Compared with pnWE, pnFE has more active substances and stronger antioxidant capacity. In addition, pnFE has a protective effect on H2O2-induced oxidative stress in MSFs with appropriate safety and stability.Conclusion: PnFE has broad application prospects in the field of cosmetics.Keywords: Panax notoginseng, Saccharomyces cerevisiae, fermentation, oxidative stress, fibroblast cells, cosmetic ingredient
A CORRELATIONAL STUDY OF MATHEMATICS SELF-EFFICACY AND ANXIETY WITH MATHEMATICS ACADEMIC ACHIEVEMENT OF GRADE 12 STUDENTS AT A PUBLIC HIGH SCHOOL IN YUNNAN, CHINA
No full textAbstract: This study aimed to determine whether there was a significant relationship of mathematics self-efficacy and anxiety with mathematics academic achievement of Grade 12 students at a public high school in Yunnan, China. A quantitative correlational research design was chosen to examine the relationship between these three research variables. The participants were 106 students conveniently sampled from the Grade 12 Science Program at the target school, during the academic year 2021-2022. The Mathematics Self-Efficacy and Anxiety Questionnaire (MSEAQ; May, 2009) was adopted and used to measure the levels of the participants’ mathematics self-efficacy and mathematics anxiety. The mathematics final exam scores were collected from the participants to measure their mathematics academic achievement. From the data analysis, it was found that the overall level of mathematics self-efficacy held by Grade 12 students at the target school was moderate, their overall level of mathematics anxiety was low, and there was a significant, positive and moderately strong relationship between their mathematics self-efficacy and mathematics academic achievement. Moreover, a significant, negative and moderately strong relationship between mathematics anxiety and mathematics academic achievement of Grade 12 students at the target public high school was found, and a significant, moderately strong multiple correlation among participants’ mathematics self-efficacy, mathematics anxiety and mathematics academic achievement was obtained. Recommendations are provided for students, teachers, school principal and administrators, and future researchers, based on the research findings obtained from this study.
Keywords: Mathematics Self-Efficacy, Mathematics Anxiety, Academic Achievement, Mathematics Education, High School Education.
Title: A CORRELATIONAL STUDY OF MATHEMATICS SELF-EFFICACY AND ANXIETY WITH MATHEMATICS ACADEMIC ACHIEVEMENT OF GRADE 12 STUDENTS AT A PUBLIC HIGH SCHOOL IN YUNNAN, CHINA
Author: Zixin Zhang, Orlando González
International Journal of Recent Research in Social Sciences and Humanities (IJRRSSH)
ISSN 2349-7831
Vol. 9, Issue 2, April 2022 - June 2022
Page No: 156-164
Paper Publications
Website: www.paperpublications.org
Published date: 17-May-2022
DOI: https://doi.org/10.5281/zenodo.6556396
Paper Download Link (Source):
https://www.paperpublications.org/upload/book/A%20CORRELATIONAL%20STUDY-17052022-2.pdfInternational Journal of Recent Research in Social Sciences and Humanities (IJRRSSH), ISSN 2349-7831, Paper Publications,
Website: www.paperpublications.or
Blue LD-pumped electro-optically Q-switched Pr:YLF visible laser with kilowatt-level peak power
No full textWe report the generation of high energy visible pulsed beam from a blue LD-pumped electro-optically (EO) Q-switched Pr3+:LiYF4 (Pr:YLF) laser for the first time. The maximum pulse energy and highest peak power in our work perform excellent in the blue LD-pumped pulse visible lasers. The shortest pulse duration of 137 ns is obtained at the repetition rate of 100 Hz, corresponding to a single pulse energy of 260 μJ and peak power of 1.90 kW. Our research results indicate that the Pr:YLF crystal could be suitable for the generation of high energy Q-switched visible lasers. Meanwhile, we pave up a new way for the practical implementation of blue LD-pumped directly generate high energy Q-switched visible laser
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