检索结果-南通市图书馆

Neural Regeneration Research 2024年第4期19卷 715-716页

作者： Prakruthi amar Kumar Jennifer N.Dulin Department of Biology Texas A&M UniversityCollege Station Texas A&M Institute for Neuroscience Texas A&M UniversityCollege Station

Neural stem and progenitor cell(NSPC)transpla ntation has emerged as a promising therapeutic strategy for replacing lost neuronal populations and repairing damaged neural circuits following nervous system injury and disease.A great deal of experimental work has investigated the biology of NSPC grafting in preclinical animal models;more recently.

关键词： neural system injured

Antenatal Noninvasive Fetal Electrocardiography:A Literature Review

在线全文

学校读者我要写书评

暂无评论

Maternal-Fetal Medicine 2024年第3期6卷 178-189页

作者： Claire Pegorie Becky Liu Basky Thilaganathan amar Bhide Department of Obstetrics and Gynaecology St George’s University Hospitals NHS Foundation TrustLondon SW170QTUnited Kingdom Vascular Biology Research Centre Molecular and Clinical Sciences Research InstituteSt George’s University of LondonLondon SW170QTUnited Kingdom

Fetal heart rate(FHR)monitoring is one of the central parts of obstetric ***-based technologies such as cardiotocography(CTG)remain the most common method for FHR *** CTG’s limitations,including subjective interpretation,high interobserver variability,and the need for skilled professionals,led to the development of computerized CTG(cCTG).While cCTG demonstrated advantages,its superiority over visual interpretation remains *** has prompted the exploration of alternatives like noninvasive fetal electrocardiography(NIFECG).This review explores the landscape of antenatal FHR monitoring and the need for remote FHR monitoring in a patient-centered care ***,FHR monitoring needs to evolve from the traditional approach to incorporate artificial intelligence and machine *** review underscores the importance of aligning fetal monitoring with modern healthcare,leveraging artificial intelligence algorithms for accurate assessments,and enhancing patient *** physiology of FHR variability(FHRV)is explained emphasizing its significance in assessing fetal *** measures of FHRV and their relevance are *** delves into the promising realm of NIFECG,detailing its history and recent technological *** potential advantages of NIFECG are objective FHR assessment,beat-to-beat variability,patient comfort,remote prolonged use,and less signal loss with increased maternal body mass *** its promise,challenges such as signal loss must be *** clinical application of NIFECG,its correlation with cCTG measures,and ongoing technological advancements are *** conclusion,this review explores the evolution of antenatal FHR monitoring,emphasizing the potential of NIFECG in providing reliable,home-based monitoring *** research directions are outlined,urging longitudinal studies and evidence generation to establish NIFECG’s role in enhancing fetal well-being assess

关键词： Ambulatory monitoring Noninvasive fetal electrocardiography Fetal heart-rate monitoring Fetal heart rate variability

High-speed silicon photonic electro-optic Kerr modulation

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2024年第1期12卷 51-60页

作者： JONATHAN PELTIER WEIWEI ZHANG LEOPOLD VIROT CHRISTIAN LAFFORGUE LUCAS DENIEL DELPHINE MARRIS-MORINI GUY AUBIN FARAH amar DENH TRAN XINGZHAO YAN CALLUM G.LITTLEJOHNS CARLOS ALONSO-RAMOS KE LI DAVID J.THOMSON GRAHAM REED LAURENT VIVIEN University Paris-Saclay CNRSCentre for Nanoscience and Nanotechnology(C2N)Palaiseau 91120France University Grenoble Alpes CEALETIGrenoble 38000France Optoelectronics Research Centre Zepler Institute for Photonics and NanoelectronicsFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Silicon-based electro-optic modulators contribute to easing the integration of high-speed and low-power consumption circuits for classical optical communications and data *** the plasma dispersion modulation,an alternative solution in silicon is to exploit the DC Kerr effect,which generates an equivalent linear electro-optical effect enabled by applying a large DC electric *** some theoretical and experimental studies have shown its existence in silicon,limited contributions relative to plasma dispersion have been achieved in high-speed modulation so *** paper presents high-speed optical modulation based on the DC Kerr effect in silicon PIN *** contributions of both plasma dispersion and Kerr effects have been analyzed in different waveguide configurations,and we demonstrated that the Kerr induced modulation is dominant when a high external DC electric field is applied in PIN ***-speed optical modulation response is analyzed,and eye diagrams up to 80 Gbit/s in NRZ format are obtained under a *** of 30 *** work paves the way to exploit the Kerr effect to generate high-speed Pockels-like optical modulation.

关键词： waveguide dispersion effect

Molecular Hydrogen Storage in Spherophanes： A Molecular Mechanic Investigation

在线全文

学校读者我要写书评

暂无评论

Journal of Chemistry and Chemical Engineering 2011年第3期5卷 217-228页

作者： amar saal Ourida Ouamerali Claude A. Daul Thibaut Jarrosson Departement of Chemistry UMMTO University Algeria Departement of Chemistry University of Fribourg Chemin du musd 9 Fribourg 1700 Switzerland LPCTCI Laboratory Faculty of Chemistry USTHB El Alia Algiers 16111 Algeria Institut Charles Gerhardt Ensc Montpellier Equipe AM2N 34296 France

At the molecular mechanic level, the capability of a set of 24 molecular cage-like structures, the spherophanes, to store hydrogen molecules has been studied. Two main factors have been found to govern their storage capacity: the volume of their cavity and the potential energy barriers at the different openings at the surface of the cage. Calculations have shown that 13H2 molecules could be stored inside the thiaspherophane, Th4S, whose mean radius is 10? and the resulting complex (H2)13@Th4S is found to be stable. The results show that it would be very difficult to store more than 2H2 inside the smallest spherophane, Sp4, whose mean radius is 7.7?. The mean intermolecular distance H2-H2 and the mean bond length H-H have been found to decrease when the number of imprisoned hydrogen molecules increases. It has also been found that the encapsulated H2 molecules form clusters of different symmetries on which the formation energy depends strongly. Even with 13H2 molecules inside Th4S, the weight percentage is still small, 2.57%. The largest obtained wt% is 3.22% in the case of Th5S(CH3)10.

关键词：分子力学贮氢平均半径存储容量 H2分子分子对称性笼状结构空腔体积

Finite element analysis of slope stability by expanding the mobilized principal stress Mohr's circles-Development, encoding and validation

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 Rock Mechanics and Geotechnical Engineering 2022年第4期14卷 1165-1179页

作者： Djillali amar Bouzid Department of Civil Engineering Faculty of TechnologyUniversity of Blida 1Blida09000Algeria

In recent years,finite element analysis is increasingly being proposed in slope stability problems as a competitive method to traditional limit equilibrium methods(LEMs)which are known for their inherent ***,the application of finite element method(FEM)to slope stability as a strength reduction method(SRM)or as finite element limit analysis(FELA)is not always a success for the drawbacks that characterize both *** increase the performance of finite element analysis in this problem,a new approach is proposed in this *** consists in gradually expanding the mobilized stress Mohr’s circles until the soil failure occurs according to a prescribed non-convergence *** present approach called stress deviator increasing method(SDIM)is considered rigorous for three main ***,it preserves the definition of the factor of safety(FOS)as the ratio of soil shear strength to the mobilized shear ***,it maintains the progressive development of shear stress resulting from the increase in the principal stress deviator on the same plane,on which the shear strength takes ***,by introducing the concept of equivalent stress loading,the resulting trial stresses are checked against the violation of the actual yield criterion formed with the real strength parameters rather than those reduced by a trial *** new numerical procedure was encoded in a Fortran computer code called S^(4)DINA and verified by several *** with other numerical methods such as the SRM,gravity increasing method(GIM)or even FELA by assessing both the FOS and contours of equivalent plastic strains showed promising results.

关键词： Slope stability,Finite element analysis Strength reduction method(SRM),Stress point-based factor of safety(FOS),Limit equilibrium method(LEM),Stress deviator Mohr’s circle,Plastic strain

Production optimization under waterflooding with long short-term memory and metaheuristic algorithm

在线全文

学校读者我要写书评

暂无评论

Petroleum 2023年第1期9卷 53-60页

作者： Cuthbert Shang Wui Ng Ashkan Jahanbani Ghahfarokhi Menad Nait amar Department of Geoscience and Petroleum Norwegian University of Science and TechnologyTrondheimNorway Département Etudes Thermodynamiques Division LaboratoiresSonatrachBoumerdesAlgeria

In petroleum domain,optimizing hydrocarbon production is essential because it does not only ensure the economic prospects of the petroleum companies,but also fulfills the increasing global demand of ***,applying numerical reservoir simulation(NRS)to optimize production can induce high computational *** models are suggested to alleviate this challenge because they are computationally less demanding and able to yield reasonably accurate *** this paper,we demonstrated how a machine learning technique,namely long short-term memory(LSTM),was applied to develop proxies of a 3D reservoir *** techniques were employed to create numerous simulation cases which served as the training database to establish the *** blind validating the trained proxies,we coupled these proxies with particle swarm optimization to conduct production *** training and blind validation results illustrated that the proxies had been excellently developed with coefficient of determination,R2 of *** also compared the optimization results produced by NRS and the *** comparison recorded a good level of accuracy that was within 3%*** proxies were also computationally 3 times faster than ***,the proxies have served their practical purposes in this study.

关键词： Production optimization Numerical reservoir simulation Machine learning Long short-term memory(LSTM) Dynamic proxies Particle swarm optimization(PSO)

Propagation of surfactant and polymer flow in natural carbonate cores

在线全文

学校读者我要写书评

暂无评论

Petroleum 2022年第3期8卷 414-423页

作者： Dongqing Cao Jinxun Wang Ming Han amar J.Alshehri Beijing Research Center Aramco AsiaBeijing100102PR China EXPEC Advanced Research Center Saudi AramcoDhahran31311Saudi Arabia

This paper presents an experimental and analytical study of comprehensive effects of surfactant and polymer in aqueous solutions on the propagation in ***-phase flow tests of surfactant,polymer and surfactant-polymer mixture were respectively conducted on natural carbonate core plugs at high temperature and high salinity reservoir *** effect of different factors on chemical propagation was taken into account by use of a convection-dispersion *** dynamic adsorptions of two amphoteric surfactants at 2000 mg/L concentration onto the carbonate rocks were 0.21 and 0.17 mg/g-rock,*** dynamic adsorptions of a sulfonated polymer at 2000 and 5000 mg/L were 0.11 and 0.17 mg/g-rock,***-polymer mixtures in aqueous solutions were coinjected to evaluate their competitive adsorption,showing the surfactant adsorption was reduced by approximately 50%.The dispersion coefficient of the chemicals in the carbonate cores was in the magnitude of 10^(-3) cm^(2)/*** by dispersion and adsorption,chemical concentration reduction occurred obviously during the propagation in carbonate porous *** separation took place in the surfactant-polymer co-injection scheme,which was estimated by modeling as well.

关键词： Natural carbonate core Chemical propagation Polymer Surfactant Competitive adsorption Convention-dispersion model

Born with a luxated globe:An ocular emergency

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2022年第2期13卷 158-159页

作者： Neelam Pushker Sahil Agrawal Milind Changole Gautam Lokadarshi amar Pujari Oculoplasty Tumor&Paediatric Ophthalmology ServicesDr Rajendra Prasad Centre for Ophthalmic SciencesAIIMSNew Delhi 110029India

Dear editor,Globe luxation is defined as complete prolapse of the eyeball outside the orbital cavity with eyelids closed behind the ***,globe luxation can be categorized as traumatic,spontaneous or voluntary;males are affected more than females with an average age of 30 years.[1]Traumatic globe luxation is quite rare in children,with most cases reported in the adult age *** fracture comprises 5%to 25%of all facial fractures in the paediatric age group.[2]In cases with luxation of globe,immediate reposition is crucial for globe and vision *** describe the clinical features,evaluation,and management of globe luxation present at birth following normal vaginal delivery conducted elsewhere.

关键词： ocular editor lux

Predicting wax deposition using robust machine learning techniques

在线全文

学校读者我要写书评

暂无评论

Petroleum 2022年第2期8卷 167-173页

作者： Menad Nait amar Ashkan Jahanbani Ghahfarokhi Cuthbert Shang Wui Ng Departement Etudes Thermodynamiques Division LaboratoiresSonatrachAvenue 1er Novembre35000BoumerdesAlgeria Department of Geoscience and Petroleum Norwegian University of Science and TechnologyS.P.Andersens veg 15b7031TrondheimNorway

Accurate prediction of wax deposition is of vital interest in digitalized systems to avoid many issues that interrupt the flow assurance during production of hydrocarbon *** present investigation aims at establishing rigorous intelligent schemes for predicting wax deposition under extensive production *** do so,multilayer perceptron(MLP)optimized with Levenberg-Marquardt algorithm(MLPLMA)and Bayesian Regularization algorithm(MLP-BR)were taught using 88 experimental *** latter were described by some independent variables,namely temperature(in K),specific gravity,and compositions of C1eC3,C4eC7,C8eC15,C16eC22,C23eC29 and C30þ.The obtained results showed that MLP-LMA achieved the best performance with an overall root mean square error of 0.2198 and a coefficient of determination(R2)of *** performance comparison revealed that MLP-LMA outperforms the prior approaches in the literature.

关键词： Wax deposition Multilayer perceptron Levenberg-marquardt algorithm Flow assurance

Performance Improved of a Lime and Hemp-Based Concrete through the Addition of Metakaolin

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2023年第5期19卷 1091-1113页

作者： Suzanne Daher amar Benazzouk Haïkel Ben Hamed Thierry Langlet Universitéde Picardie Jules Verne Avenue des Facultés Amiens80025France

This work describes in detail the experimental investigation of the physico-mechanical properties of nonstructural hemp concrete(usually used as insulating wall material)when the Air-lime based Tradial PF70 binder is partially replaced using *** objective is to reduce the amount of free Ca2+ions in the binder as these are responsible for the degradation of vegetables particles and can therefore induce a loss of mechanical *** order to assess the effectiveness of pozzolanic reaction,amounts of 0%,10%,and 20%*** Air-lime binder were replaced by the Metakaolin material,while testing the mechanical properties of concrete specimens containing 200%and 300%of hemp *** SEM and EDX analysis,a tight relationship has been found to exist between the Metakaolin content and physical-mechanical properties of *** pozzolanic reaction consumes calcium hydroxide from binder to produce Hydrated Calcium Silicates(C-S-H)and in turn,this leads to a decrease in the pH-value of the pore solution which is the main factor responsible for hemp particle degradation.

关键词： Agro-sourced materials hemp particles tradical PF70 binder metakaolin pozzolanic products mechanical properties deformability particle mineralisation SEM and EDX analyses