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Journal of Bionic Engineering 2018年第5期15卷 914-923页

作者： Suyambulingam Indran Robinson Dhas Edwin Raj brainerd samuel sundar daniel Joseph Selvi Binoj Department of Mechanical Engineering Rohini College of Engineering and Technology Anjugramam - 629401 Tamil Nadu India Department of Mechanical Engineering St. Xavier's Catholic College of Engineering Nagercoil - 629003 Tamil Nadu India Department of Metallurgical and Materials Engineering Indian Institute of Technology Roorkee - 247667 Uttarakhand India Department of Mechanical Engineering Sree Vidyanikethan Engineering College (Autonomous) Tirupati - 517102 Andhra Pradesh India

Health and sustainability are the major concerns that drive researchers to find novel materials to replace artificial hazardous materials. In this investigation, the mechanical properties of Cissus quadrangularis Stem Fiber （CQSF） reinforced with unsaturated polyester composite were optimized by varying the fiber length and content. To substantiate the findings, chemical property, thermal property, microstructure, and water absorption property were analyzed. Progressive enhancement of mechanical properties was observed with increasing the fiber content and fiber length up to 30 wt.% and 40 ram. However, beyond that limit, there was a decline in the strength due to improper bonding of fiber with matrix. Optimal values of mechanical property for CQSF composite were obtained at 30 wt.% fiber content and 40 mm fiber length, which are comparable with that of common artificial fiber-reinforced polymer composites.

关键词： CQSF mechanical properties thermogravimetric anlaysis microstructure water absorption

Flame Synthesis of Zr/ZSM-5 Catalysts with Tunable Acidity for the Oxidative Dehydrogenation of Propane to Propene

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Journal of Thermal Science 2024年第1期33卷 268-283页

作者： daniel samuel FONZEU MONGUEN Cedric Karel WU Lingnan TIAN Zhenyu Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Tuning the surface acidity of ZSM-5 catalyst is essential to achieve desired propene selectivity and *** several ratios of Zr were utilized to modify ZSM-5 via flame spray pyrolysis technique coupled with a pulse spray evaporation *** interaction between Zr and ZSM-5 in the flame influenced the physicochemical and acidity properties of the Zr/*** increasing Zr ratio in ZSM-5 shows coated layers of irregular nano-sized Zr with an increase in crystallite sizes due to the synergetic effect between Zr and *** surface chemical analysis revealed increased lattice oxygen on the Zr modified ZSM-5(1:4) sample compared to other *** acidity analysis revealed the Lewis and Br?nsted acid distribution in the weak and medium acid sites on the catalyst ***,the increase in Zr loading decreased the concentration of Br?nsted acid sites and tuned the catalyst surface to more Lewis acidity,promoting propene selectivity and hindering the over-oxidation of *** modified ZSM-5 catalysts were examined in a fixed bed reactor within 300℃-700℃ at a gas hourly space velocity(GHSV) of 6000 mL·g(catalysts)^(-1)·h^(-1) for the oxidative dehydrogenation of propane(ODHP) to *** the catalysts,Zr/ZSM-5(1:4) exhibited the best propene yield, with 57.19% propane conversion and 75.54% selectivity to propene and the highest *** work provides a promising strategy for tuning the surface acidity of ZSM-5 with Zr for ODHP applications.

关键词： flame synthesis Zr modified ZSM-5 catalyst ODHP surface acidity lattice oxygen

Comparative Analysis: Trays versus Packed Columns in Pressure-Swing Distillation for the Separation of Tetrahydrofuran, Water and Ethanol Azeotropic Mixture

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World Journal of Engineering and Technology 2024年第3期12卷 798-819页

作者： samuel Oluwaseun Ogunrinde Tolulope daniel Adekoya Thomas A. Orhadahwe Department of Mechanical Engineering Faculty of Engineering Ajayi Crowther University Oyo Nigeria AstraZeneca Boston Massachusetts USA

This paper delves into the comparative study of tray and packed column pressure swing distillation systems, focusing on the separation of a ternary mixture containing ethanol, tetrahydrofuran (THF), and water. The study particularly emphasizes the production of 99.5 w/w% tetrahydrofuran from the downstream product of 1,4-butanediol synthesis via diethyl maleate. Pro/II simulation software is utilized to explore various system configurations, including sieve trays, valve trays, and packed columns. Material and energy balances are performed to ascertain stream compositions and energy demands. The investigation encompasses the effects of column operating pressure on condenser and reboiler temperatures, as well as the implications of utility streams. A rigorous distillation model is employed to compare valve tray, sieve tray, and random packing (utilizing Norton Super Intalox) column designs by varying the number of trays, reflux ratio, and second distillation column pressure. Heat exchangers are integrated into the model, and their areas and utility flow rates are computed and integrated into the economic assessment. Economic analysis, guided by Net Present Value (NPV) calculations over a 20-year span, drives the selection of the most cost-effective design. Results demonstrate that while all designs are energy-efficient, the packed column system emerges as the most economical choice, offering a comprehensive framework for the separation process. Furthermore, optimal design configurations and operating conditions for both tray and packed column systems are outlined, providing valuable insights for industrial applications.

关键词： Azetrope Tetrahydrofuran Ethanol Pressure-Swing Distillation Simulation

Multiplex Rapid Test with Acceptable Diagnosis Performance as a Solution to Increase Diagnosis of Hepatitis B and C Viruses in Pregnant Women in an Area of High Prevalence of Both Hepatitis Viruses Associated with HIV

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Open Journal of Medical Microbiology 2024年第1期14卷 50-65页

作者： Catherine Boni-Cisse Nina Esther Onstira Ngoyi Hermione Dahlia Mossoro-Kpinde Noella Packo Rabi Senekian Hermann Ndoidet Koutou Coretha Bokia-Baguida Christelle Luce Bobossi-Gadia Arthur Simplice Sombot-Ndicky daniel Yvon Gonessa Freddy samuel Ngbonga Konzapa Voulou Christian Diamant Mossoro-Kpinde Alassane OUATTARA National Center of Medical Oncology and Radiotherapy Abidjan Ivory Cost Department of Microbiology UFR of Medical Sciences University of Cocody Abidjan Ivory Cost Laboratory of Bacteriology-Virology of Teaching Hospital Center of Brazzaville Brazzaville Republic of Congo Faculty of Health Sciences Marien NGOUABI University Brazzaville Republic of Congo Department of Labor Medicine Service of HIV and STDs Control in the Workplace Bangui Central African Republic (CAR) Faculty of Health Sciences University of Bangui Bangui Central African Republic National Reference Center of Sexually Transmitted Diseases and Antiretroviral Therapy Bangui Central African Republic National Laboratory of Clinical Biology and Public Health Bangui Central African Republic Medicine Department District Hospital of Alindao Alindao Ouaka Prefecture Central African Republic Doctoral School of Sciences and Technology University of Bangui Bangui Central African Republic Coordination of Specialized Study of Clinical Biology University of Bangui Bangui Central African Republic Doctors without Borders Hospital Sica BanguiCRA Laboratory of Medical Analysis of Teaching Hospital Center Mother Elisabeth DOMITIEN of Bimbo Bimbo Central African Republic

Background and Objective: HIV, hepatitis B virus (HBV) and hepatitis C virus (HCV) are very widespread in the world, however, less than 20% of the people affected are diagnosed and treated. This study aimed to determine the prevalence of HIV, HCV and HBV co-infections in pregnant women at Bangui Community University Hospital and the cost of screening. Methods: A cross-sectional study involving consenting pregnant women who came for antenatal care was performed. HIV, HCV antibodies and HBV antigens were detected using Exacto Triplex? HIV/HCV/HBsAg rapid test, cross-validated by ELISA tests. Sociodemographic and professional data, the modes of transmission and prevention of HIV and both hepatitis viruses were collected in a standard sheet and analyzed using the Epi-Info software version 7. Results: Pregnant women aged 15 to 24 were the most affected (45.3%);high school girls (46.0%), and pregnant women living in cohabitation (65.3%) were the most represented. Twenty-five (16.7%) worked in the formal sector, 12.7% were unemployed housewives and the remainder in the informal sector. The prevalence of HIV, HBV, and HCV viruses was 11.8%, 21.9% and 22.2%, respectively. The prevalence of co-infections was 8.6% for HIV-HBV, 10.2% for HIV-HCV, 14.7% for HBV-HCV and 6.5% for HIV-HBV-HCV. All positive results and 10% of negative results by the rapid test were confirmed by ELISA tests. The serology of the three viruses costs 39,000 FCFA (60 Euros) by ELISA compared to 10,000 FCFA (15.00 Euros) with Exacto Triplex? HIV/HCV/AgHBs (BioSynex, Strasbourg, France). Conclusion: The low level of education and awareness of hepatitis are barriers to development and indicate the importance of improving the literacy rate of women in the Central African Republic (CAR). Likewise, the high prevalence of the three viruses shows the need for the urgent establishment of a national program to combat viral hepatitis in the CAR.

关键词： HIV-HCV-HBV Co-Infection Multiplex Immunochromatographic Rapid Test Central Africa Serology Test Cost Diagnostic Accessibility

Distance assessment of detours by jum ping spiders

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Current Zoology 2020年第3期66卷 263-273页

作者： samuel AGUILAR-ARGUELLO daniel GERHARD Ximena J.NELSON School of Biological Sciences University of CanterburyPrivate Bag 4800Christchurch 8140New Zealand School of Mathem atics and Statistics University of CanterburyPrivate Bag 4800Christchurch 8140New Zealand

To take an indirect route(detour)in order to reach a specific target requires complex cognitive *** more demanding,from the cognitive point of view,is when the goal is only visible at the beginning of the *** spiders from the family Sa lticidae,vision is a key sensory modal-ity mediating navigation and prey *** acute vision allows them to perform complicated detours,possibly as a consequence of the multitude of potential routes in their typically complex 3-dimensional *** used a 4-route choice test,in which routes differed in being either short or long and in the presence or absence of a lure of a prey item,to investigate route assessment in 2 salticid species,Trite planiceps and Marpissa *** both species showed evidence of motivation to follow lured-routes,judging by the number of times they re-oriented toward them while detouring,we found that Trite chose short routes in preference to long routes,but did not prefer the *** contrast,Marpissa exhibited random route choice,although it ori-ented toward lured-routes more often than control routes(lure absent).Our results suggest that decision-making processes about which route to take occurs before embarking on a route,but this is cognitively *** exhibited cognitive limitations in which the lack of visibility of the goal affected ***,the severity of cognitive limitations depended on *** suggest that variability in spatial ability across the Salticidae may be related to the habitat complexity inhabited by each species.

关键词： cognition cognitive limitations decision-making detour behavior Salticidae spatial task

Superior antibody and membrane protein‑specific T‑cell responses to CoronaVac by intradermal versus intramuscular routes in adolescents

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World Journal of Pediatrics 2024年第4期20卷 353-370页

作者： Jaime S.Rosa Duque samuel M.S.Cheng Carolyn A.Cohen daniel Leung Xiwei Wang Xiaofeng Mu Yuet Chung Tsun Ming Lau Manni Wang Wenyue Zhang Yanmei Zhang Howard H.W.Wong Leo C.H.Tsang Sara Chaothai Tsz Chun Kwan John K.C.Li Karl C.K.Chan Leo L.H.Luk Jenson C.H.Ho Wing Yan Li Amos M.T.Lee Jennifer H.Y.Lam Sau Man Chan Wilfred H.S.Wong Issan Y.S.Tam Masashi Mori Sophie A.Valkenburg Malik Peiris Wenwei Tu Yu Lung Lau Department of Paediatrics and Adolescent Medicine The University of Hong KongHong KongChina School of Public Health The University of Hong KongHong KongChina HKU‑Pasteur Research Pole School of Public HealthThe University of Hong KongHong KongChina Research Institute for Bioresources and Biotechnology Ishikawa Prefectural UniversityNonoichiJapan Department of Microbiology and Immunology Peter Doherty Institute for Infectionand ImmunityUniversity of MelbourneMelbourneVICAustralia Center for Immunology and Infection C2i Hong KongChina

Background Optimising the immunogenicity of COVID-19 vaccines to improve their protection against disease is *** dosing by intradermal(ID)administration has been shown to be equally immunogenic as intramuscular(IM)administration for several vaccines,but the immunogenicity of ID inactivated whole severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)at the full dose is *** study(NCT04800133)investigated the superiority of antibody and T-cell responses of full-dose CoronaVac by ID over IM administration in *** Participants aged 11–17 years received two doses of IM or ID vaccine,followed by the 3rd dose 13–42 days *** and cellular immunogenicity outcomes were measured post-dose 2(IM-CC versus ID-CC)and post-dose 3(IMCCC versus ID-CCC).Doses 2 and 3 were administered to 173 and 104 adolescents,*** Spike protein(S)immunoglobulin G(IgG),S-receptor-binding domain(RBD)IgG,S IgG Fcγreceptor IIIa(FcγRIIIa)-binding,SNM[sum of individual(S),nucleocapsid protein(N),and membrane protein(M)peptide pool]-specific interleukin-2(IL-2)+CD4^(+),SNM-specific IL-2^(+)CD8^(+),S-specific IL-2^(+)CD8^(+),N-specific IL-2^(+)CD4^(+),N-specific IL-2^(+)CD8^(+)and M-specific IL-2^(+)CD4^(+)responses fulfilled the superior and non-inferior criteria for ID-CC compared to IM-CC,whereas IgG avidity was *** ID-CCC,S-RBD IgG,surrogate virus neutralisation test,90%plaque reduction neutralisation titre(PRNT90),PRNT50,S IgG avidity,S IgG FcγRIIIa-binding,M-specific IL-2^(+)CD4^(+),interferon-γ+CD8^(+)and IL-2^(+)CD8^(+)responses were superior and non-inferior to *** estimated vaccine efficacies were 49%,52%,66%and 79%for IM-CC,ID-CC,IM-CCC and ID-CCC,*** ID groups reported more local,mild adverse *** This is the first study to demonstrate superior antibody and M-specific T-cell responses by ID inactivated SARSCoV-2 vaccination and serves as the basis for future research to improve the

关键词： CoronaVac Coronavirus disease 2019 Immunity Intradermal Vaccine

Malware Guard Extension:abusing Intel SGX to conceal cache attacks

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Cybersecurity 2020年第1期3卷 22-41页

作者： Michael Schwarz samuel Weiser daniel Gruss Clementine Maurice Stefan Mangard Graz University of Technology GrazAustria CNRS IRISARennesFrance.

In modern computer systems,user processes are isolated from each other by the operating system and the ***,in a cloud scenario it is crucial that the hypervisor isolates tenants from other tenants that are co-located on the same physical ***,the hypervisor does not protect tenants against the cloud provider and thus,the supplied operating system and *** SGX provides a mechanism that addresses this *** aims at protecting user-level software from attacks from other processes,the operating system,and even physical *** this paper,we demonstrate fine-grained software-based side-channel attacks from a malicious SGX enclave targeting co-located *** attack is the first malware running on real SGX hardware,abusing SGX protection features to conceal ***,we demonstrate our attack both in a native environment and across multiple Docker *** perform a Prime+Probe cache side-channel attack on a co-located SGX enclave running an up-to-date RSA implementation that uses a constant-time multiplication *** attack works,although in SGX enclaves,there are no timers,no large pages,no physical addresses,and no shared *** a semi-synchronous attack,we extract 96%of an RSA private key from a single *** extract the full RSA private key in an automated attack from 11 traces within 5 min.

关键词： Intel SGX Side channel Side-channel attack Prime+Probe

Prevalence of bacterial vaginosis and its risk factors in HIV/AIDS patients with abnormal vaginal discharge

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Asian Pacific Journal of Tropical Medicine 2011年第2期4卷 156-158页

作者： samuel Nwadioha daniel Egah Edmond Banwat Julie Egesie Ifeanyi Onwuezobe Medical Microbiology Department College of Health SciencesBenue State UniversityMakurdi Medical Microbiology Department Jos University Teaching HospitalJos Haematology Department Jos University Teaching HospitalJos

Objective:To determine the prevalence of bacterial vaginosis in the HIV/AIDS patients of primary health care clinics in Jos Plateau state,***:Female genital swabs were collected from primary health care centers,Jos and analyzed by microscopy,culture,*** Jos University Teaching Hospital from December 2006 to December *** on epidemiologic indices were collected,using structured interviewer-administered ***: The incidence of bacterial vaginosis in the study was 28%(n=196/700).Among the HIV/AIDS group,the bacterial vaginosis incidence was 36%(n=126/350),while in the control(non-HIV patients) group,the rate was 20%(70/350) with a statistically significant difference at 95 percent confidence level(P<0.05).HIV/AIDS and non-HIV(control) patients contributed 64%(n=126/196) and 36%(n=70/196),*** risks to bacterial vaginosis included vaginal douching with disinfectant/detergent constituted(60%),poor use of condom 40%,a median age of 26 years,and a median number of 3 sex partners per ***:There was a significant statistical difference in prevalence of bacterial vaginosis between the HIV/AIDS group and non-HIV(control) group of patients in the *** behaviors that promote the incidence of bacterial vaginosis should be especially paid attention.

关键词： Bacterial vaginosis HIV/AIDS Microscopy Culture Sensitivity

The benefits of being dominant:health correlates of male social rank and age in a marmot

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Current Zoology 2022年第1期68卷 19-26页

作者： Kenta UCHIDA Rachel NG samuel A.VYDRO Jennifer E.SMITH daniel T.BLUMSTEIN Department of Ecology&Evolutionary Biology University of CaliforniaLos AngelesCA 90095-1606USA Department of Biology Mills CollegeOaklandCA 94613USA The Rocky Mountain Biological Laboratory Crested ButteCO 81224USA

The benefits of dominance may not come without costs,particularly for *** example,the“immunocompetence handicap hypothesis”states that males with enhanced mating success allocate resources to enhance reproductive output at a cost to their current health,whereas the“resource quality hypothesis”predicts that high-ranking males may benefit from increased reproduction and good *** the predictions from each have been well tested in captive animals and in a variety of highly social primates,fewer studies have been carried out in free-living,facultatively social *** adult male yellow-bellied marmots(Marmota flaviventer),we evaluated predictions of these hypotheses by examining the relationship between social rank and 2 health indicators—fecal glucocorticoid metabolite(FCM)levels,and neutrophil/lymphocyte(N/L)ratios—after accounting for variation explained by age,body mass,and *** found that higher-ranking males tended to have a lower N/L ratio(reflecting good health)than lower-ranking individuals,whereas FCM levels were not significantly related to *** addition,heavier male marmots had lower N/L ratios,whereas body mass was not associated with FCM *** also found that older adult males had lower FCM levels(reflecting less physiological stress)but higher N/L ratios than younger ***,we found that FCM levels decreased as the active season progressed and FCM levels were associated with the time of the ***,our results suggest that socially-dominant male marmots enjoyed better,not worse health in terms of lower N/L ratios.

关键词： immunocompetence handicap hypothesis life history trade-offs N/L ratio physiological stress resource quality hypothesis

Effective teaching of endoscopy:a qualitative study of the perceptions of gastroenterology fellows and attending gastroenterologists

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Gastroenterology Report 2016年第2期4卷 125-130,I0002页

作者： daniel J.Zanchetti samuel A.Schueler Brian C.Jacobson Robert C.Lowe Boston University Medical Center BostonMAUSA

Background:There is little information describing the perceptions of gastroenterology fellows and attending gastroenterologists of what constitutes effective teaching of *** sought to identify common themes regarding endoscopy training methods and their impact among fellows and ***:Focus group exercises and surveys were conducted among fellows,about educational resources,teaching techniques and ways of improving the teaching of *** fellows identified the‘best’teachers of endoscopy,who were interviewed regarding their training in endoscopy,their teaching methods,key points of information,and opinions on endoscopy ***:Nineteen fellows(68%)had attended the American Society for Gastrointestinal Endoscopy First Year Fellows’Endoscopy course and found it very *** fellows(46%)had exposure to an endoscopy simulator,but their median duration of use was only 1 *** two out of five fellowship programs used a formal endoscopic skill assessment tool and none of the programs had an endoscopy curriculum of which the fellows were *** reported that they learned endoscopy best by performing *** also volunteered that attending gastroenterologists used variable teaching methods,and might benefit from instruction on how to teach *** attending gastroenterologists(77%)had received training in advanced procedures;none received formal training on teaching endoscopy:they all felt that such training would be ***:A standardized endoscopy curriculum may be beneficial to fellows,who prefer to learn endoscopy by performing procedures—but they want explicit and specific *** those attending and the fellows thought that formal instruction for attending gastroenterologists on how to teach endoscopy would be beneficial,indicating a role for a‘teachthe-teacher’curriculum.

关键词： endoscopy curriculum teaching endoscopy gastroenterology fellowship training