检索结果-南通市图书馆

International Journal of Mining Science and Technology 2021年第6期31卷 1033-1042页

作者： Zhouyueyang cheng Yimin Zhu Yanjun Li stephen Butt a college of Resource and civil Engineering Northeastern UniversityShenyang 110819China b National-Local Joint Engineering Research center of Refractory Iron Ore Resources Efficient Utilization Technology Shenyang 110819China c Faculty of Engineering and Applied Science Memorial University of NewfoundlandSt.John’s A1C 5S7Canada

In this paper,two surfactants,3-dodecyloxypropanamine(DOPA) and 3-tetradecyloxypropylamine(TOPA),were synthesized and used as collectors in the quartz micro-flotation in the *** tests,FT-IR,XPS measurements,and ab initio Molecular Dynamics(MD) simulations were conducted to research DOPA,TOPA,and dodecylamine(DDA)'s adsorption mechanisms onto quartz(101)*** results of micro-flotation show that the adsorption of DOPA and TOPA onto quartz surface is more robust than that of *** zeta-potential result shows that the DOPA/TOPA was adsorbed on quartz through electrostatic ***,MD simulation adsorption models were built to compare the computational properties of the three surfactants,such as the radial distribution function,and the interaction energies between the collectors and the quartz cleavage *** interaction energies of surfactants(RNH_(3)^(+) or RNH_(2)) on the quartz surface explained why the pH range of DOPA/TOPA is wider than that of *** analyses and MD simulations confirmed that DOPA bonded with the(101) surface of quartz through three types of hydrogen bonds between the-NH_(2) of DOPA and the O atom of *** hydrogen bonds of type A and type c were the most likely type and more potent than those of type B.

关键词： Quartz(101)surface Flotation Molecular dynamics 3-Dodecyloxypropanamine Adsorption

The HIPERc Project:the Use of Nb for High Performance and Economy in Steel for Linepipe and General Structural Use

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S1期18卷 690-695页

作者： Webster stephen Drewett Lyn consultant UK Tata Steel RD&T Swinden Technology CentreRotherhamUK

The HIPERc study was a European research project involving several steel companies and research organisations which examined the effects of alloying elements and processing conditions in low carbon (containing (0.05%-0.12 wt.%) ***-scale heats and pilot rolling trials simulating air and water-cooled plate production as well as hot-rolled strip production were made and the effects of c,Mn,Ni,cu,cr,Mo,Nb,Ti and B on transformation characteristics and temperatures of recrystallisation *** equations for the characterisation of microstructure,tensile and impact properties and for the weldability of these steels were *** were manufactured and processed into plate and coil-plate by three steel companies and pipe produced from both *** from these,plus thicker plate for structural use,were determined and these compared well with the values predicted from the regression *** project has shown that excellent combinations of strength,toughness and weldability can be obtained for a wide variety of *** benefits were seen and recommendations on altering the limits for niobium in Euronorms have been proposed.

关键词： steel niobium linepipe structural property

Models to predict injury, physical fitness failure and attrition in recruit training: a retrospective cohort study

在线全文

学校读者我要写书评

暂无评论

Military Medical Research 2020年第4期7卷 391-400页

作者： Robin M.Orr Bruce S.cohen stephen c.Allison Lakmini Bulathsinhala Edward J.Zambraski Mark Jaffrey Tactical Research Unit Bond University2 Promethean WayGold CoastRobinaQLD 4226Australia United States Army Research Institute for Environmental Medicine NatickMA 01760USA Defence Science and Technology Group Port MelbourneVIC 3207Australia

Background:Attrition rate in new army recruits is higher than in incumbent *** the current study,we identified the risk factors for attrition due to injuries and physical fitness failure in recruit training.A variety of predictive models were ***:This retrospective cohort included 19,769 Army soldiers of the Australian Defence Force receiving recruit training during a period from 2006 to *** them,7692 reserve soldiers received a 28-day training course,and the remaining 12,077 full-time soldiers received an 80-day training *** data included anthropometric measures,course-specific variables,injury,and physical fitness *** regression was used to develop a variety of models to predict the rate of attrition due to injuries and physical fitness *** area under the receiver operating characteristic curve was used to compare the performance of the ***:In the overall analysis that included both the 28-day and 80-day courses,the incidence of injury of any type was 27.8%.The 80-day course had a higher rate of injury if calculated per course(34.3%vs.17.6%in the 28-day course),but lower number of injuries per person-year(1.56 vs.2.29).Fitness test failure rate was significantly higher in the 28-day course(30.0%vs.12.1%).The overall attrition rate was 5.2%and 5.0%in the 28-day and 80-day courses,*** fracture was common in the 80-day course(n=44)and rare in the 28-day course(n=1).The areas under the receiver operating characteristic curves for the course-specific predictive models were relatively low(ranging from 0.51 to 0.69),consistent with"failed"to"poor"predictive *** course-combined models performed somewhat better than the course-specific models,with two models having AUc of 0.70 and 0.78,which are considered"fair"predictive ***:Attrition rate was similar between 28-day and 80-day *** comparison to the 80-day full course,the 28-day course had a lower rat

关键词： Military training Predictive modelling Risk management Soldier

Z charmoniumlike mesons

在线全文

学校读者我要写书评

暂无评论

chinese Physics c 2011年第7期35卷 695-702页

作者： Arafat Gabareen Mokhtar stephen Lars Olsen SLAc National Accelerator Laboratory Stanford Seoul National University KOREA

A brief review of the experimental situation concerning the electrically charged charmoniumlike meson candidates, Z-, is presented.

关键词： quarkonium exotics multiquark state

Exercise regulates cardiac metabolism: Sex does matter

在线全文

学校读者我要写书评

暂无评论

Journal of Sport and Health Science 2022年第4期11卷 418-420页

作者： Tingting Yang Meiyu Hu Michail Spanos Guoping Li stephen c Kolwicz Jr Junjie Xiao Shanghai Applied Radiation Institute School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China cardiac Regeneration and Ageing Lab Institute of Cardiovascular SciencesShanghai Engineering Research Center of Organ RepairSchool of Life ScienceShanghai UniversityShanghai 200444China cardiovascular Division of the Massachusetts General Hospital and Harvard Medical School BostonMA 02114USA Heart and Muscle Metabolism Laboratory Department of Health and Exercise PhysiologyUrsinus CollegeCollegevillePA 19426USA

cardiac substrate utilization remains a critical focus for the research community.1 Research has acknowledged the role of metabolic flexibility in the development and progression of cardiac dysfunction during a variety of diseases and conditions.2,3 Under resting basal conditions,the heart relies on fatty acid metabolism as the primary energy source with glucose,lactate,ketone bodies,pyruvate,acetate,and branched-chain amino acids contributing as substrates depending on substrate availability,hormonal status,and myocardial conditioning.4 In addition to pathological states,physiological states,such as acute exercise,induce dynamic changes in substrate metabolism,including nearly a 10-fold increase in myocardial oxygen consumption.3,5 To meet the increased demand for energy during and after a bout of exercise,the heart muscle must exhibit metabolic flexibility and selectively utilize different substrates for adenosine triphosphate ***,metabolic substrate adaptations depend on the frequency,intensity,duration,and mode of exercise while multiple metabolic fluxes,such as the use,storage and mobilization of substrates must be coordinated to maintain energy homeostasis.1,2 Although many different processes of exercise-induced regulation and metabolic remodeling have been identified,35 the effect of exercise on cellular metabolism and the landscape of metabolic pathway regulation in response to both acute exercise and chronic exercise training remain unclear.

关键词： metabolism cardiac utilize

The biosynthesis and wall-binding of hemicelluloses in cellulose-deficient maize cells:An example of metabolic plasticity

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2015年第4期57卷 373-387页

作者： María de castro Janice G.Miller José Luis Acebes Antonio Encina Penélope García-Angulo stephen c.Fry The Edinburgh cell Wall Group Institute of Molecular Plant SciencesSchool of Biological SciencesDaniel Rutherford BuildingThe King's Buildings Laboratory of Plant Physiology Faculty of Biological and Environmental SciencesUniversity of Léon

cell-suspension cultures（Zea mays L.,Black Mexican sweet corn） habituated to 2,6-dichlorobenzonitrile（DcB） survive with reduced cellulose owing to hemicellulose network modification. We aimed to de fine the hemicellulose metabolism modifications in DcB-habituated maize cells showing a mild reduction in cellulose at different stages in the culture cycle. Using pulse-chase radiolabeling, we fed habituated and non-habituated cultures with [3H]arabinose,and traced the distribution of 3H-pentose residues between xylans, xyloglucans and other polymers in several cellular compartments for 5 h. Habituated cells were slower taking up exogenous [3H]arabinose. Tritium was incorporated into polysaccharide-bound arabinose and xylose residues, but habituated cells diverted a higher proportion of their new [3H]xylose residues into（hetero） xylans at the expense of xyloglucan synthesis. During logarithmic growth, habituated cells showed slower vesicular traf ficking of polymers,especially xylans. Moreover, habituated cells showed a decrease in the strong wall-binding of all pentose-containing polysaccharides studied; correspondingly, especially in log phase cultures, habituation increased the proportion of 3H-hemicelluloses（[3H]xylans and [3H]xyloglucan） sloughed into the medium. These findings could be related to the cel walls’ cellulose-deficiency, and consequent reduction in binding sites for hemicelluloses; the data could also re fl ect the habituated cells’ reduced capacity to integrate arabinox ylans by extra-protoplasmic phenolic cross-linking, as well as xyloglucans, during wall assembly.

关键词： Arabinoxylan cell wall cross-linking 2,6-dichlorobenzonitrile Hemicellulose biosynthesis xyloglucan

Efficient and interpretable graph network representation for angle-dependent properties applied to optical spectroscopy

在线全文

学校读者我要写书评

暂无评论

npj computational Materials 2022年第1期8卷 1434-1442页

作者： Tim Hsu Tuan Anh Pham Nathan Keilbart stephen Weitzner James chapman Penghao Xiao S.Roger Qiu Xiao chen Brandon c.Wood center for Applied Scientific computing Lawrence Livermore National LaboratoryLivermoreCAUSA Materials Science Division Lawrence Livermore National LaboratoryLivermoreCAUSA Department of Physics and Atmospheric Science Dalhousie UniversityHalifaxNSCanada

Graph neural networks are attractive for learning properties of atomic structures thanks to their intuitive graph encoding of atoms and ***,conventional encoding does not include angular information,which is critical for describing atomic arrangements in disordered *** this work,we extend the recently proposed ALIGNN(Atomistic Line Graph Neural Network)encoding,which incorporates bond angles,to also include dihedral angles(ALIGNN-d).This simple extension leads to a memory-efficient graph representation that captures the complete geometry of atomic ***-d is applied to predict the infrared optical response of dynamically disordered cu(II)aqua complexes,leveraging the intrinsic interpretability to elucidate the relative contributions of individual structural *** and dihedral angles are found to be critical contributors to the fine structure of the absorption response,with distortions that represent transitions between more common geometries exhibiting the strongest absorption *** directions for further development of ALIGNN-d are discussed.

关键词： representation disordered absorption

Silk-based nerve guidance conduits with macroscopic holes modulate the vascularization of regenerating rat sciatic nerve

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1789-1800页

作者： carina Hromada Patrick Heimel Markus Kerbl LászlóGál Sylvia Nürnberger Barbara Schaedl James Ferguson Nicole Swiadek Xavier Monforte Johannes c.Heinzel Antal Nógrádi Andreas H.Teuschl-Woller David Hercher Department Life Science Engineering University of Applied Sciences Technikum WienViennaAustria Austrian cluster for Tissue Regeneration ViennaAustria Ludwig Boltzmann Institute for Traumatology The Research Center in Cooperation with AUVAViennaAustria University clinic of Dentistry Medical University of ViennaViennaAustria Department of Plastic Reconstructive and Aesthetic SurgeryLandesklinikum Wiener Neustadt2700 Wiener NeustadtAustria Department of Anatomy Histology and EmbryologyAlbert Szent-Györgyi Medical SchoolUniversity of SzegedSzegedHungary Medical University of Vienna Department of Orthopedics and Trauma SurgeryDevision of Trauma SurgeryViennaAustria Department of Hand- PlasticReconstructive and Burn SurgeryBG Unfallklinik TuebingenUniversity of TuebingenTuebingenGermany

Peripheral nerve injuries induce a severe motor and sensory deficit. Since the availability of autologous nerve transplants for nerve repair is very limited, alternative treatment strategies are sought, including the use of tubular nerve guidance conduits(tNGcs). However, the use of tNGcs results in poor functional recovery and central necrosis of the regenerating tissue, which limits their application to short nerve lesion defects(typically shorter than 3 cm). Given the importance of vascularization in nerve regeneration, we hypothesized that enabling the growth of blood vessels from the surrounding tissue into the regenerating nerve within the tNGc would help eliminate necrotic processes and lead to improved regeneration. In this study, we reported the application of macroscopic holes into the tubular walls of silk-based tNGcs and compared the various features of these improved silk^(+) tNGcs with the tubes without holes(silk^(–) tNGcs) and autologous nerve transplants in an 8-mm sciatic nerve defect in rats. Using a combination of micro-computed tomography and histological analyses, we were able to prove that the use of silk^(+) tNGcs induced the growth of blood vessels from the adjacent tissue to the intraluminal neovascular formation. A significantly higher number of blood vessels in the silk^(+) group was found compared with autologous nerve transplants and silk^(–), accompanied by improved axon regeneration at the distal coaptation point compared with the silk^(–) tNGcs at 7 weeks postoperatively. In the 15-mm(critical size) sciatic nerve defect model, we again observed a distinct ingrowth of blood vessels through the tubular walls of silk^(+) tNGcs, but without improved functional recovery at 12 weeks postoperatively. Our data proves that macroporous tNGcs increase the vascular supply of regenerating nerves and facilitate improved axonal regeneration in a short-defect model but not in a critical-size defect model. This study suggests that further optimizatio

关键词： axon regeneration blood vessel functional recovery macroporous nerve lesion peripheral nerve repair sciatic nerve silk-based nerve guidance conduit vascularization

Femoral lengthening in young patients:An evidence-based comparison between motorized lengthening nails and external fixation

在线全文

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2021年第11期12卷 909-919页

作者： Mohamed Hafez Nicolas Nicolaou Amaka c Offiah stephen Giles Sanjeev Madan James A Fernandes Department of Oncology and Metabolism Sheffield UniversitySheffield S102TNUnited Kingdom Department of Paedaiatric Limb Reconstruction Sheffield Children HospitalSheffield S102THUnited Kingdom Department of Radiology Sheffield Children HospitalSheffield S102THUnited Kingdom Department of Trauma and Orthopaedics Sheffield Children HospitalSheffield S102ThUnited Kingdom

BAcKGROUND Femoral lengthening is a procedure of great importance in the treatment of congenital and acquired limb *** advances have led to the latest designs of fully implantable motorized intramedullary lengthening *** use of these nails has increased over the last few *** To review and critically appraise the literature comparing the outcome of femoral lengthening in children using intramedullary motorized lengthening nails to external *** Electronic databases(MEDLINE,cINAHL,EMBASE,cochrane)were systematically searched in November 2019 for studies comparing the outcome of femoral lengthening in children using magnetic lengthening nails and external *** outcomes included amount of gained length,healing index,complications and patient reported *** Of the 452 identified studies,only two(retrospective and non-randomized)met the inclusion criteria.A total of 91 femora were *** both studies,the age of patients treated with nails ranged from 15 to 21 years compared to 9 to 15 years for patients in the external fixation *** devices achieved the target *** of adverse events was less in the nail(60%-73%)than in the external fixation(81%-100%)*** of the studies presented patient reported *** The clinical effectiveness of motorized nails is equivalent or superior to external fixation for femoral lengthening in young *** available literature is limited and does not provide evidence on patient quality of life or cost effectiveness of the interventions.

关键词： Lengthening nails Motorized nails Distraction ostepgenesis Lengthening

Feruloylated Arabinoxylans Are Oxidatively cross- Linked by Extracellular Maize Peroxidase but Not by Horseradish Peroxidase

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2009年第5期2卷 883-892页

作者： Sally J. Burr stephen c. Fry The Edinburgh cell Wall Group Institute of Molecular Plant Sciences School of Biological Sciences The University of Edinburgh Daniel Rutherford Building The King's Buildings Edinburgh EH9 3JH UK Present address: Ecologie Microbienne/UMR cNRS 5557 USc INRA 1193 Universite Claude Bernard--Lyon 1 Batiment Gregor Mendel 16 rue Dubois F-69622 Villeurbanne Cedex France

covalent cross-linking of soluble extracellular arabinoxylans in living maize cultures, which models the cross- linking of wall-bound arabinoxylans, is due to oxidation of feruloyl esters to oligoferuloyl esters and ethers. The oxidizing system responsible could be H2O2/peroxidase, O2/laccase, or reactive oxygen species acting non-enzymically, To distinguish these possibilities, we studied arabinoxylan cross-linking in vivo and in vitro. In living cultures, exogenous, soluble, extracellular, feruloylated [pentosyl-3H]arabinoxylans underwent cross-linking, beginning abruptly 8 d after sub-culture. crosslinking was suppressed by iodide, an H2O2 scavenger, indicating dependence on endogenous H2O2. However, exogenous H2O2 did not cause precocious cross-linking, despite the constant presence of endogenous peroxidases, suggesting that younger cultures contained natural cross-linking inhibitors. Dialysed culture-filtrates cross-linked [^3H]arabinoxylans in vitro only if H2O2 was also added, indicating a peroxidase requirement. This cross-linking was highly ionic-strength-dependent. The peroxidases responsible were heat-labile, although relatively heat-stable peroxidases （assayed on o-dianisidine） were also present. Surprisingly, added horseradish peroxidase, even after heat-denaturation, blocked the arabinoxylancross-linking action of maize peroxidases, suggesting that the horseradish protein was a competing substrate for [^3H]arabinoxylan coupling. In conclusion, we show for the first time that cross-linking of extracellular arabinoxylan in living maize cultures is an action of apoplastic peroxidases, some of whose unusual properties we report.

关键词： cell wall cross-links phenolics ferulate peroxidase soluble extracellular polysaccharides Zea mays L.