检索结果-南通市图书馆

Experimental and numerical study of fence effects on dust emission into atmosphere from open storage piles

在线全文

学校读者我要写书评

暂无评论

Journal of Central south University 2011年第2期18卷 411-419页

作者： s.ToRNo J.ToRA-o M MENéNDEZ M.GENT i.áLVAREZ Mining and Civil Works Research Group Oviedo University school of Mines Oviedo University

The results obtained from the research on the behaviour of fences (solid and porous) in the protection against particulated material emission to the atmosphere from open storage piles,are presented. This research was carried out through computational fluid dynamics (CFD) simulation by software Ansys CFX-10.0 in 3D,with K-epsilon being considered in the turbulence model. The efficiency of the use of porous fences as a protection against the wind flow,which interacts with an open storage pile,is shown. The use of these fences (when porosity is ε=30%) allows the reduction of wind flow velocity which interacts with the pile in comparison with the case of no use of fences (when porosity is 100%). in addition,the use of porous fences makes the velocity vortex,which is formed between the solid fence (ε=0%) and the pile,disappear,reducing the particle emission to the atmosphere by 78%.

关键词： open storage pile air pollution particle emission wind erosion porous fence computational fluid dynamics

Bleeding risk assessment in elderly patients with acute coronary syndrome

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2019年第2期16卷 145-150页

作者： Lucía Riobóo-Lestón sergio Raposeiras-Roubin Emad Abu-Assi Andrés i?iguez-Romo Department of Cardiology University Hospital álvaro Cunqueiro

Nowadays,elderly people represent a growing population segment with a well known increased risk of both ischemic and bleeding *** acute coronary syndrome guidelines,strongly recommend dual antiplatelet therapy(DAPT)with few specific references for aged patients due to lack of *** aged>75 years are misrepresented in the classic derivation trials *** to reduce the bleeding risk in this group of patients are urgently needed for the daily clinical *** the specific age related bleeding risk factors and the importance of an integral geriatric assessment remains *** of the available in-hospital and out-hospital bleeding risk scores have shown a lower to moderate predictive ability in older patients and no specific tools are developed in elderly *** importance of an appropriate vascular access choice,type and duration of antiplatelet drugs is crucial to reduce the bleeding *** radial approaches and short DAPT duration leads to reduce *** interesting subgroup of patients is those who need chronic anticoagulation therapy after percutaneous coronary intervention,due to their very high risk of *** alternatives as dual therapy with oral anticoagulation and only one antiplatlet drug should be *** current review,we evaluate the available evidence about bleeding risk in elderly.

关键词： Acute coronary syndrome Bleeding risk Dual antiplatelet treatment Elderly patients

Prognostic impact of inflammatory and nutritional biomarkers in pancreatic cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical oncology 2025年第1期16卷 5-9页

作者： Macarena Teja María i Garrido Abrahams ocanto Felipe Counago Department of Radiation oncology GenesisCare-San Francisco de Asís University HospitalMadrid 28002Spain Department of Radiation oncology GenesisCare-Vithas La Milagrosa University HospitalMadrid 28010Spain National Director GenesisCare SpainMadrid 28043Spain Department of Medicine School of MedicineHealth and SportEuropean University of MadridMadrid 28670Spain

Pancreatic cancer is usually associated with a poor *** is the main curative treatment but pancreatic operations are aggressive and new tools that help clinicians to predict surgical and prognostic outcomes are *** et al recently published a retrospective,single centre cohort study evaluating the impact of seven nutritional and inflammatory markers in pancreatic cancer surgical patients:The albumin-to-globulin ratio,prognostic nutritional index(PNi),systemic immune-inflammation index(sii),neutrophil-to-lymphocyte ratio(NLR),platelet-to-lymphocyte ratio(PLR),nutritional risk index,and the geriatric nutritional risk index.A significant correlation was found between the PNi,sii,NLR,and PLR and a hospital discharge of less than 15 *** a univariable analysis,PNi,sii,NLR and PLR were significantly related to recurrence-free survival and,in a multivariable analysis PNi was associated with overall *** meta-analyses corroborate the results in terms of prognosis but individual studies are discordant on their ***,the cut-off values for these markers vary significantly between studies and there are no clinical trials comparing them to identify the most relevant *** are limitations when implementing nutritional and inflammatory biomarkers into clinical practice and further studies are needed in order to answer these questions.

关键词： inflammatory biomarkers Nutritional biomarkers Pancreatic cancer Prognosis surgical complications

irreversibility analysis of unsteady couette flow with variable viscosity

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

Journal of Hydrodynamics 2015年第2期27卷 304-310页

作者： EEGUNJoBi A.s. MAKiNDE o.D. TsHEHLA M.s. FRANKs o. Department of Mathematics and statistics Namibia University of Science and Technology Faculty of Military science Stellenbosch University Faculty of Engineering Built Environment and information Technology Nelson Mandela Metropolitan University Faculty of Military science Stellenbosch University

This paper investigates numerically the inherent irreversibility in unsteady generalized Couette flow between two parallel plates with variable viscosity. The nonlinear governing equations are derived from the Navier-stokes equations and solved numerically using a semi-discretization finite difference method together with the Runge-Kutta-Fehlberg integration scheme. The profiles of velocity and the temperature obtained are used to compute the entropy generation number, Bejan number, skin friction and Nusselt number. The effects of embedded parameters on entire flow structure are presented graphically and discussed quantitatively.

关键词： parallel plates variable viscosity heat transfer Couette flow entropy generation

Current self-limitation in a transverse nanosecond discharge with a slotted cathode

在线全文

学校读者我要写书评

暂无评论

Plasma science and Technology 2017年第3期19卷 69-74页

作者： N A AsHURBEKoV K o iMiNoV o A PoPoV G s sHAKHsiNoV Dagestan state University Faculty of Physics 43a Gadjieva Street Makhachkala 367002 Russia Moscow Power Engineering institute Krasnokazal'mennaya 14 Moscow 111250 Russia

A high-voltage transverse pulsed nanosecond discharge with a slotted hollow cathode was found to be a source of high-energy （few kV） ribbon electron beams. Conditions for the formation and extinction of electron beams were experimentally studied in discharges in helium at pressures of 1-100 Torr. it was found that interaction of fast electrons with a non-uniform electric field near the slotted cathode led to limitation of the magnitude of the discharge current. A physical model was developed to describe the discharge current self-limitation that was in satisfactory agreement with the experimental results. some technical solutions that are expected to increase the upper current limits in transverse nanosecond discharge are discussed.

关键词： nanosecond discharge electron beams upper current limitation slotted cathode

oN THE GENERALiZED GLAisHER-HoNG's CoNGRUENCEs

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,series B 2002年第1期23卷 63-66页

作者： i. sLAVUTsKii str. Hamarva,4, o.Box 23393, Akko, israel. E-mail: nickl@*** str. Hamarva 4 P.O.Box 23393 Akko Israel

Recently Hong shaofang[6] has investigated the sums (np + j)-r ( with an odd prime number p 5 and n, r N) by Washington’s p-adic expansion of these sums as a power series in n where the coefficients are values of p-adic L-fuctions[12]. Herethe author shows how a more general sums (npl +j)-r,l N, may be studied by elementary methods.

关键词： Glaisher's congruence kth Bernoulli number Kummer-staudt's congruence p-adic L-function

Regulator of G protein signaling 6 mediates exercise-induced recovery of hippocampal neurogenesis,learning,and memory in a mouse model of Alzheimer’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第10期20卷 2969-2981页

作者： Mackenzie M.spicer Jianqi Yang Daniel Fu Alison N.DeVore Marisol Lauffer Nilufer s.Atasoy Deniz Atasoy Rory A.Fisher Department of Neuroscience and Pharmacology University of Iowa Carver College of MedicineIowa CityIAUSA iowa Neuroscience institute University of Iowa Carver College of MedicineIowa CityIAUSA interdisciplinary Graduate Program in Molecular Medicine University of Iowa Carver College of MedicineIowa CityIAUSA Neural Circuits and Behavior Core University of Iowa Carver College of MedicineIowa CityIAUSA

Hippocampal neuronal loss causes cognitive dysfunction in Alzheimer’s *** hippocampal neurogenesis is reduced in patients with Alzheimer’s *** stimulates adult hippocampal neurogenesis in rodents and improves memory and slows cognitive decline in patients with Alzheimer’s ***,the molecular pathways for exercise-induced adult hippocampal neurogenesis and improved cognition in Alzheimer’s disease are poorly ***,regulator of G protein signaling 6(RGs6)was identified as the mediator of voluntary running-induced adult hippocampal neurogenesis in ***,we generated novel RGs6fl/fl;APP_(sWE) mice and used retroviral approaches to examine the impact of RGs6 deletion from dentate gyrus neuronal progenitor cells on voluntary running-induced adult hippocampal neurogenesis and cognition in an amyloid-based Alzheimer’s disease mouse *** found that voluntary running in APP_(sWE) mice restored their hippocampal cognitive impairments to that of control *** cognitive rescue was abolished by RGs6 deletion in dentate gyrus neuronal progenitor cells,which also abolished running-mediated increases in adult hippocampal *** hippocampal neurogenesis was reduced in sedentary APP_(sWE) mice versus control mice,with basal adult hippocampal neurogenesis reduced by RGs6 deletion in dentate gyrus neural precursor ***6 was expressed in neurons within the dentate gyrus of patients with Alzheimer’s disease with significant loss of these RGs6-expressing ***,RGs6 mediated voluntary running-induced rescue of impaired cognition and adult hippocampal neurogenesis in APP_(sWE) mice,identifying RGs6 in dentate gyrus neural precursor cells as a possible therapeutic target in Alzheimer’s disease.

关键词： adult hippocampal neurogenesis Alzheimer’s disease dentate gyrus exercise learning/memory neural precursor cells regulator of G protein signaling 6(RGs6)

Modified Nonlinear Model of Arcsin-Electrodynamics

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2016年第7期65卷 59-65页

作者： s.i.Kruglov Department of Chemical and Physical sciences University of Toronto

A new modified model of nonlinear arcsin-electrodynamics with two parameters is proposed and *** obtain the corrections to the Coulomb law. The effect of vacuum birefringence takes place when the external constant magnetic field is present. We calculate indices of refraction for two perpendicular polarizations of electromagnetic waves and estimate bounds on the parameter γ from the BMV and PVLAs experiments. it is shown that the electric field of a point-like charge is finite at the origin. We calculate the finite static electric energy of point-like particles and demonstrate that the electron mass can have the pure electromagnetic nature. The symmetrical Belinfante energy-momentum tensor and dilatation current are found. We show that the dilatation symmetry and dual symmetry are broken in the model suggested. We have investigated the gauge covariant quantization of the nonlinear electrodynamics fields as well as the gauge fixing approach based on Dirac's brackets.

关键词： vacuum birefringence energy-momentum tensor static electric energy dilatation current dual symmetry quantization Dirac's brackets

Co-pyrolysis of cassava peel with synthetic polymers:thermal and kinetic behaviors

在线全文

学校读者我要写书评

暂无评论

Waste Disposal and sustainable Energy 2021年第4期3卷 289-298页

作者： B.s.Adeboye B.Z.Adewole A.M.Adedoja s.o.obayopo s.A.Mamuru M.o.idris i.K.okediran A.A.Asere Department of Mechanical Engineering Osun State UniversityOsogboOsun 210001Nigeria Department of Mechanical Engineering Obafemi Awolowo UniversityIle-IfeOsunNigeria Department of Pure and Applied Chemistry Adamawa State UniversityMubiAdamawaNigeria

This research effort focuses on the co-pyrolysis of cassava peels waste and some synthetic polymers towards energy conversion and reducing the volume of these waste fractions dumped on *** co-pyrolysis behavior and pyrolysis kinetics of various synthetic polymer wastes/cassava peel blends were investigated by blending cassava peel waste with low-density polyethylene(LDPE),polyethylene terephthalate(PET),and polystyrene(Ps)at different weight *** physical characteristics of each sample were investigated and the co-pyrolysis experiments were conducted at a heating rate of 10℃/min from room temperature to 800℃in N_(2)atmosphere in a thermogravimetric *** to thermal decomposition,kinetic analysis was done using the thermogravimetric *** from physicochemical characterization showed that cassava peel has a relatively lower calorific value of 15.92 MJ/kg compared with polystyrene(41.1 MJ/kg),low-density polyethylene(42.6 MJ/kg),and polyethylene terephthalate(21.1 MJ/kg).The thermal decomposition behavior of cassava peel was seen to be significantly different from those of the synthetic *** decomposition of the biomass material such as cassava peel generally occurs in two stages while the decomposition of LDPE,Ps,and PET occurred in a single *** activation energy required for thermal degradation in cassava peel was also found to be lower to that of the plastic *** co-pyrolysis of cassava peel and different synthetic polymers affected the thermal and kinetic behaviors of the blends,reduce the activation energy and residue after pyrolysis.

关键词： Co-pyrolysis Cassava peel synthetic Polymer Kinetic Thermal