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Poly(lactic acid)-starch/Expandable Graphite (PLA-starch/EG) Flame Retardant Composites

Journal of Renewable Materials 2018年第1期6卷 26-37页

作者： Mfiso Emmanuel Mngomezulu Adriaan Stephanus Luyt steve Anthony Chapple Maya Jacob John Department of Chemistry University of the Free State(Qwaqwa Campus)Private Bag X13Phuthaditjhaba 9866South Africa Center for Advanced Materials Qatar UniversityPO Box 2713DohaQatar CSIR Materials Science and Manufacturing Polymers and Composites Competence AreaPO Box 1124Port Elizabeth 6000South Africa Department of Chemistry Faculty of ScienceNelson Mandela Metropolitan UniversityPO Box 1600Port Elizabeth 6000South Africa

This work reports on the effect of commercial expandable graphite(EG)on the flammability and thermal decomposition properties of PLA-starch *** PLA-starch/EG composites were prepared by melt-mixing and their thermal stability,volatile pyrolysis products and flammability characteristics were *** char residues of the composites,after combustion in a cone calorimeter,were analyzed with environmental scanning electron microscopy(ESEM).The thermal decomposition stability of the composites improved in the presence of ***,the char content was less than expected as per the combination of the wt%EG added into PLA-starch and the%residue of *** flammability performance of the PLA-starch/EG composites improved,especially at 15 wt%EG content,due to a thick and strong worm-like char *** peak heat release rate(PHRR)improved by 74%,the total smoke production(TSP)by 40%and the specific extinction area(SEA)by 55%.The improvements are attributed to the ability of EG to exfoliate at increased temperatures during which time three effects occurred:(i)cooling due to an endothermic exfoliation process,(ii)dilution due to release of H2O,SO2 and CO2 gases,and (iii)formation of a protective intumescent char ***,the CO and CO2 yields were found to be unfavorably high due to the presence of EG.

关键词： Poly(lactic acid)-starch composites expandable graphite thermal stability flammability properties

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Diagnostic tools in male infertility--the question of sperm dysfunction

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Asian Journal of Andrology 2011年第1期13卷 53-58页

作者： Christopher LR Barratt steven Mansell Catherine Beaton steve Tardif Senga K Oxenham Reproductive and Developmental Biology Maternal and Child Health Science Laboratories Centre for Oncology and Molecular Medicine Ninewells Hospital University of Dundee Dundee DD1 9SY Scotland UK Assisted Conception Unit NHS Tavside Ninewelts Hospital. Dundee. DD1 9SY. Scotland. UK

Sperm dysfunction is the single most common cause of infertility, yet what is remarkable is that, there is no drug a man can take or add to his spermatozoa in vitroto improve fertility. One reason for the lack of progress in this area is that our understanding of the cellular and molecular workings of the mature spermatazoon is limited. However, over the last few years there has been considerable progress in our knowledge base and in addressing new methods to diagnose sperm dysfunction. We review the current state of the field and provide insights for further development. We conclude that：（i） there is little to be gained from more studies identifying/categorizing various populations of men using a basic semen assessment, where an effort is required in making sure the analysis is performed in an appropriate high quality way; （ii） technological development is likely to bring the reality of sperm function testing closer to implementation into the clinical pathways. In doing this, these assays must be robust, cheap （or more appropriately termed cost effective）, easy to use and clinically useful; and （iii） clinical necessity, e.g., the need to identify the highest quality spermatozoon for injection is driving basic research forward. This is an exciting time to be an andrologist and, likely, a fruitful one.

关键词： gamete biomarker male fertility sperm biomarker sperm dysfunction

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Transforming bilayer MoS2 into single-layer with strong photoluminescence using UV-ozone oxidation

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Nano Research 2015年第12期8卷 3878-3886页

作者： Weitao Su Naresh Komar steve J. Spencer Ning Dai Debdulal Roy Institute of Materials Physics Hangzhou Dianzi University Hangzhou 310018 China Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Ningbo 315201 China National Physical Laboratory Hampton Road Teddington Middlesex TWI 10LW UK

The use of single-layer MoS2 in light emitting devices requires innovative methods to enhance its low photoluminescence （PL） quantum yield. In this work, we report that single-layer MoS2 with a strong PL can be prepared by oxidizing bilayer MoS2 using W-ozone oxidation. We show that as compared to mechanically-exfoliated single-layer MoS2, the PL intensity of the single-layer MoS2 prepared by W-ozone oxidation is enhanced by 20-30 times. We demonstrate that the PL intensity of both neutral excitons and trions （charged excitons） can be greatly enhanced in the oxidized MoS2 samples. These results provide novel insights into the PL enhancement of single-layer MoS2.

关键词： single-layer MoS2 W-ozone oxidation photoluminescence enhancement tip-enhanced Raman spectroscopy

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Forensic odontology identification response to terrorist attacks in Paris November 2015

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Forensic Sciences Research 2020年第3期5卷 214-222页

作者： steve Toupenay Aida Ben Cheikh Bertrand Ludes Rufino Felizardo UFR Odontologie Universite de ParisParisFrance Universite de Paris BABELCNRSInstitut Medico-Legal de ParisParisFrance

The terrorist attacks of November 2015 led to the immediate death of 129 victims admitted to the Legal and Forensic Medicine Institute of Paris,including 41 *** the Disaster Victim Identification(DVI)operations,22 bodies were examined by the postmortem(PM)dental team with the aim of establishing PM *** the same time,the dental expert in the antemortem(AM)unit collected a large number of dental files,progressively filtered as the list of missing persons became *** from these events has highlighted the difficulties of implementing the DVI chain principles in a legal framework,published the day before the attacks,and also the technical complexity of collecting dental data on a week end of *** return on experience after this event has represented a paradigm shift on previous methods of DVI in Paris and even more in ***,the victim identification procedure was redesigned,integrating new technical means such as a CT scan directly on spot,allowing the extraction of maxillofacial data as soon as possible in order to support the PM dental examination ***,the National Dental Council proceeded to the overall remodeling of the dental identification unit,which is composed of trained members,from local,regional and national *** forensic experts are dedicated,at the request of the legal authorities,to DVI operations and deployed throughout the country capable of managing AM and PM *** unit aims also to share experiences and awarenessraising among health professionals and investigators in order to optimize a better submission of AM elements and also to enhance the major interest of odontology as a primary identifier in disaster.

关键词： Forensic sciences forensic odontology terrorist attack forensic identification disaster victim identification

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作者： steve Oney.

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Nontargeted identification of peptides and disinfection byproducts in water

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Journal of Environmental Sciences 2016年第4期28卷 259-266页

作者： Yanan Tang Ying Xu Feng Li Lindsay Jmaiff steve E.Hrudey Xing-Fang Li Division of Analytical and Environmental Toxicology Department of Laboratory Medicine and PathologyUniversity of Alberta Department of Computer Science University of Alberta

A broad range of organic compounds are known to exist in drinking water sources and serve as precursors of disinfection byproducts（DBPs）.Epidemiological findings of an association of increased risk of bladder cancer with the consumption of chlorinated water has resulted in health concerns about *** are thought to be an important category of DBP precursors in ***,little is known about the actual presence of peptides and their DBPs in drinking water because of their high sample complexity and low *** address this challenge and identify peptides and non-chlorinated/chlorinated peptide DBPs from large sets of organic compounds in water,we developed a novel high throughput analysis strategy,which integrated multiple solid phase extraction（SPE）,high performance liquid chromatography（HPLC）separation,and non-target identification using precursor ion exclusion（PIE）high resolution mass spectrometry（MS）.After MS analysis,structures of candidate compounds,particularly peptides,were obtained by searching against the Human Metabolome Database（HMDB）.Using this strategy,we successfully detected 625 peptides（out of 17,205 putative compounds）and 617 peptides（out of 13,297）respectively in source and finished water *** source and finished water samples had 501 peptides and amino acids in *** remaining 116 peptides and amino acids were unique to the finished *** a subset of 30 putative compounds for which standards were available,25 were confirmed using HPLC-MS *** analyzing the peptides identified in source and finished water,we successfully confirmed three disinfection reaction pathways that convert peptides into toxic DBPs.

关键词： Nontargeted detection Water analysis Mass spectrometry Peptide Disinfection byproducts

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Computer solutions in physics with applications in astrophysics, biophysics, differential equations, and engineering steve Van Wyk.

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2008年

作者： steve Van Wyk.

ISBN: (纸本)9789812709363

With the great progress in numerical methods and the speed of the modern personal computer, if you can formulate the correct physics equations, then you only need to program a few lines of code to get the answer. Where other books on computational physics dwell on the theory of problems, this book takes a detailed look at how to set up the equations and actually solve them on a PC. Focusing on popular software packages like Mathematica, Maple and MatLab, the book offers undergraduate student a comprehensive treatment of the methodology used in programing solutions to equations in physics. Contents: Equations of Motion; Vibrations and Waves; Building Differential Equation; Partial Differential Equations; Applications.

关键词： Physics

来源：畅想之星图书光盘版（南... 评论

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Coastal eutrophication, land use changes and Ceratium furca (Dinophyceae) blooms in Pago Pago Harbor, American Samoa 2007-2009

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Chinese Journal of Oceanology and Limnology 2011年第4期29卷 790-794页

作者： steve L. MORTON Andrew SHULER Jeff PATERNOSTER Sharon FANOLUA Don VARGO NOAA/National Ocean Service Marine Biotoxins Program Charleston SC 29412 USA American Samoa Community College Community and Natural Resources Pago Pago American Samoa 96799 USA

The bloom forming dinoflagellate, Ceratium furca, has been linked with coastal eutrophication worldwide in tropical and subtropical locations. During the summer of 2007, an unusual 6-month long bloom of C. furca was observed in Pago Pago Harbor, Tutuila Island, American Samoa. Incidents of dinoflagellate blooms in this area have not been previously reported. The bloom was first reported in May and dissipated in November 2007. In February-March 2009, a similar C. furca bloom was observed. During both blooms, no fish mortality events were reported. Maximum cell counts were observed on September 20, 2007 at 9 200 cell/mL. At this time, total nitrogen was measured at 1.2 mg/L while total phosphate was below detection limits. Changes in land use practices may have been the primary driver of these blooms. Intense fertilization of athletic fields coupled with ineffective management strategies is hypothesized to have a direct link to the increase in nutrients found in the Pago Pago Harbor and may have been the trigger for the initialization of these blooms. During 2008, the fields were not used due to an infestation of the fire ant, Solenopsis geminata. Once controlled, the fields were opened again in 2009 and fertilizers were applied in January, a month before the bloom was observed.

关键词： eutrophication American Samoa Ceratium furca

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A strategy for rock/coal outburst prevention

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Journal of Coal Science & Engineering(China) 2007年第3期13卷 225-229页

作者： D.H. steve Zou 程久龙 Mineral Resource Engineering Dalhousie University Halifax B3J1Z1 Key Laboratory of Mine Disaster Prevention and Control Shandong University of Science ＆ Technology Qingdao 266510 China

The current practice of rock/coal outburst monitoring, prevention and control was reviewed. The uncertainty of major factors contributing to the occurrence of such hazards and the complexicity of mining conditions surrounding the occurrence were analyzed. A strategic concept for rock/coal outburst prevention was introduced. The objective is to identify the bursting potential in an area, rather than predicting the bursting, by introducing a multi- dimension index model： potential-of-bursting （POB）, taking into consideration major contributing factors. In application, once the index has passed certain critical level indicating high risk, actions must be taken to reduce the bursting potential and to effectively prevent the hazard from occurring. A conceptual 2D model involving stress and methane pressure was described to demonstrate the methodology for determining the POB. However in practice, a POB model has to be established through experiments, field monitoring and calibration against case studies. To achieve this objective, coordinated research and international collaboration will be needed.

关键词： rock/coal outbursts mine hazards bursting potential

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Sensitivity analysis on parameter changes in underground mine ventilation systems

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Journal of Coal Science & Engineering(China) 2011年第3期17卷 251-255页

作者： LI Gary KOCSIS Charles HARDCASTLE steve Mining and Mineral Sciences Laboratories Natural Resources Canada Sudbury P3E 5P5 Canada

A more efficient mine ventilation system, the ventilation-on-demand （VOD） system, has been proposed and tested in Canadian mines recently. In order to supply the required air volumes to the production areas of a mine, operators need to know the cause and effect of any changes requested from the VOD system. The sensitivity analysis is developed through generating a cause and effect matrix of sensitivity factors on given parameter changes in a ventilation system. This new utility, which was incorporated in the 3D-CANVENT mine ventilation simulator, is able to predict the airflow distributions in a ventilation network when underground conditions and ventilation controls are changed. For a primary ventilation system, the software can determine the optimal operating speed of the main fans to satisfy the airflow requirements in underground workings without necessarily using booster fans and regulators locally. An optimized fan operating speed time-table would assure variable demand-based fresh air delivery to the production areas effectively, while generating significant savings in energy consumption and operating cost.

关键词： sensitivity factors ventilation system airflow branch resistance fixed quantity fan speed

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