检索结果-南通市图书馆

Physical and numerical modelling of the Severn Barrage

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2014年第8期57卷 1471-1481页

作者： JAMES Brammer ROGER A Falconer CHRISTOPHER Ellis reza ahmadian Cardiff University the ParadeCardiff CF24 3AAUK School of Engineering Cardiff Universitythe ParadeCardiff CF24 3AAUK Arup 4 Pierhead StreetCardiff CF10 4QPUK

The Severn Estuary has one of the largest tidal ranges in the world and has long been the subject of consideration for tidal energy *** plans to build a tidal barrage across the estuary have existed in various forms since the 1920s,the 1989Severn Tidal Power Group(STPG)proposal is commonly referred to as the original Severn *** UK government abandoned this ebb generation scheme as a public investment project in ***,plans to build a two-way generation scheme were more recently put forward by a private consortium,namely Hafren *** assess the impact that a barrage would have on the hydro-environment in the estuary a number of numerical modelling studies have previously been conducted for the STPG *** this design has now been superseded by the Hafren Power proposal,new studies have been conducted to investigate the impact of a two-way *** this study the hydro-environmental impacts of both ebb-only and two-way schemes were assessed using physical and numerical modelling *** model barrages were constructed and testing was carried out using a physical model of the Severn Estuary,located in the hydraulics laboratory at Cardiff University.A depth integrated numerical model,namely DIVAST,was applied to the physical model geometry and modifications were made to simulate the effects of the barrage *** numerical model predictions showed good agreement with the corresponding laboratory *** results were consistent with conclusions from previous studies,relating to the ebb-only *** included an increase in the minimum water levels upstream of the barrage,a reduction in the mean water levels downstream of the barrage and a general reduction in tidal *** a two-way scheme changes in the tidal elevations and velocities depended on the exact operating conditions of the *** was found that with no starting head the tidal regime was similar to the natural state,with little change in the e

关键词： Severn Barrage numerical modelling physical modelling ebb generation two-way generation

From basic researches to new achievements in therapeutic strategies of KRAS-driven cancers

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2019年第3期16卷 435-461页

作者： Mahsa Saliani Razieh Jalal Mohammad reza ahmadian Department of Chemistry Faculty of ScienceFerdowsi University of MashhadMashhad***Iran Department ofResearch Cell and Molecular Biology Institute of BiotechnologyFerdowsi University of MashhadMashhad***Iran Institute of Biochemistry and Molecular Biology II Medical FacultyHeinrich-Heine UniversityDüsseldorf40225Germany

Among the numerous oncogenes involved in human cancers, KRAS represents the most studied and best characterized cancerrelated *** therapeutic strategies targeting oncogenic KRAS(KRASonc) signaling pathways have been suggested,including the inhibition of synthetic lethal interactions, direct inhibition of KRASonc itself, blockade of downstream KRASonc effectors, prevention of post-translational KRASonc modifications, inhibition of the induced stem cell-like program, targeting of metabolic peculiarities, stimulation of the immune system, inhibition of inflammation, blockade of upstream signaling pathways,targeted RNA replacement, and oncogene-induced *** intensive and continuous efforts, KRASonc remains an elusive target for cancer *** highlight the progress to date, this review covers a collection of studies on therapeutic strategies for KRAS published from 1995 to *** overview of the path of progress from earlier to more recent insights highlight novel opportunities for clinical development towards KRASonc-signaling targeted therapeutics.

关键词： Direct inhibition downstream effectors oncogenic KRAS drug target sites small GTPases signal transduction targeting synthetic,lethal interactions therapeutic strategies

Nonlinear phenomena in vibrations of embedded carbon nanotubes conveying viscous fluid

在线全文

学校读者我要写书评

暂无评论

Nanotechnology and Precision Engineering 2024年第1期7卷 44-54页

作者： reza Ebrahimi Mechanical Engineering Faculty of EngineeringYasouj UniversityYasouj 75918-74831Iran

Various nonlinear phenomena such as bifurcations and chaos in the responses of carbon nanotubes(CNTs)are recognized as being major contributors to the inaccuracy and instability of nanoscale mechanical ***,the main purpose of this paper is to predict the nonlinear dynamic behavior of a CNT conveying viscousﬂuid and supported on a nonlinear elastic *** proposed model is based on nonlocal Euler–Bernoulli beam *** Galerkin method and perturbation analysis are used to discretize the partial differential equation of motion and obtain the frequency-response equation,respectively.A detailed parametric study is reported into how the nonlocal parameter,foundation coefﬁcients,ﬂuid viscosity,and amplitude and frequency of the external force inﬂuence the nonlinear dynamics of the ***,quasi-periodic,and chaotic behaviors and hardening nonlinearity are revealed by means of the vibration time histories,frequency-response curves,bifurcation diagrams,phase portraits,power spectra,and Poincaré***,the results show that it is possible to eliminate irregular motion in the whole range of external force amplitude by selecting appropriate parameters.

关键词： Nonlinear vibration Carbon nanotubes Nonlocal effect Viscousﬂuid Nonlinear elastic medium

Temperature-jump tensile tests to induce optimized TRIP/TWIP effect in a metastable austenitic stainless steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2025-2036页

作者： Mohammad Javad Sohrabi Hamed Mirzadeh Saeed Sadeghpour Abdol reza Geranmayeh reza Mahmudi School of Metallurgy and Materials Engineering College of EngineeringUniversity of Tehran14395-515TehranIran Centre for Advanced Steels Research Materials and Mechanical EngineeringUniversity of Oulu90014 OuluFinland

In the present work,plastic deformation mechanisms were initially tailored by adjusting the deformation temperature in the range of 0 to 200℃ in AISI 304L austenitic stainless steel,aiming to optimize the strength-ductility *** was shown that the combined twinning-induced plasticity(TWIP)/transformation-induced plasticity(TRIP)effects and a wider strain range for the TRIP effect up to higher strains by adjusting the deformation temperature are good strategies to improve the strength-ductility synergy of this metastable stainless *** this regard,by consideration of the observed temperature-dependency of plastic deformation,the controlled sequence of TWIP and TRIP effects for archiving superior strength-ductility trade-off was intended by the pre-designed temperature jump tensile ***,the optimum tensile toughness of 846 MJ/m^(3) and total elongation to 133% were obtained by this strategy via exploiting the advantages of the TWIP effect at 100℃ and the TRIP effect at 25℃ at the later stages of the ***,a deformation-temperature-transformation(DTT)diagram was developed for this metastable ***,based on work-hardening analysis,it was found that the main phenomenon constraining further improvement in the ductility and strengthening was the yielding of the deformation-induced α′-martensite.

关键词： metastable stainless steels transformation-induced plasticity twinning-induced plasticity stacking fault energy mechanical properties

Particle size distribution in a multi-zone circulating fluidized bed polymerization reactor

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第10期93卷 291-299页

作者： Mohammadhossein Hadadiyan Navid Mostoufi reza Marandi Process Design and Simulation Research Centre School of Chemical EngineeringCollege of EngineeringUniversity of TehranP.O.Box 11155-4563TehranIran Polymer Research Group Petrochemical Research and Technology CompanyNational Petrochemical CompanyP.O.Box 14358/84711TehranIran

This research focuses on modeling a multi-zone circulating reactor(MZCR)in the polypropylene production *** these reactors,designed for polyolefin production,small catalyst particles(20–300μm)initiate polymerization in the presence of monomer *** reactor consists of two main regions:the riser and the *** riser operates in the fast fluidization and the downer is in the moving bed *** the two-fluid model with the Eulerian-Eulerian approach,the dynamics of both solid and gas phases were modeled by applying Newton's laws of motion and assuming spherical *** population balance of particles within the reactor was also coupled with the equations of *** simultaneous solution of these equations provides valuable insights into particle and fluid behavior,revealing trends such as the growth of polymer ***,the impact of various operating conditions was *** study also examined the effects of design parameters(gas inlet velocity,average inlet diameter,and temperature)on the system *** instance,it was shown that in the case where the solid circulation flux is 30 kg/(m^(2) s)the velocity of particles in the bed increases from 0.4 at the inlet to 1.1 m/s in the fully developed zone,when it is 43 kg/(m^(2) s)the velocity of particles increases from 0.3 to 1.4 m/s,and when it is 55 kg/(m^(2) s),it is increased from 0.22 to 1.5 m/***,trends in particle size distribution based on temperature adjustments were *** study showed that higher temperatures accelerate the polymerization reaction rate,promoting faster growth kinetics and the formation of larger particles.

关键词： Fluidization Polymerization Gas-solid flow Multi-zone circulating reactor(MZCR) CFD-PBM Two-fluidmodel

Resilence Control of DC Microgrid Integrated with Multi-Nanogrids Considering Connected-Islanded States

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

CSEE Journal of Power and Energy Systems 2024年第2期10卷 786-796页

作者： Hossien Faraji reza Hemmati Pierluigi Siano Department of Electrical Engineering Amirkabir University of TechnologyTehranIran Department of Electrical Engineering Kermanshah University of TechnologyKermanshahIran Department of Management&Innovation Systems University of Salernoand also with the Department of Electrical and Electronic Engineering ScienceUniversity of JohannesburgJohannesburg 2006South Africa

In this paper, a DC microgrid (DCMG) integrated with a set of nano-grids (NG) is studied. DCMG exchanges predetermined active and reactive power with the upstream network. DCMG and NGs are coordinately controlled and managed in such a way the exchanged P-Q power with external grid are kept on scheduled level following all events and operating conditions. The proposed control system, in addition to the ability of mutual support between DCMG and NGs, makes NGs support each other in critical situations. On the other hand, in all operating conditions, DCMG not only feeds three-phase loads with time-varying active and reactive power on the grid side but also injects constant active power into the grid. During events, NGs support each other, NGs support DCMG, and DCMG supports NGs. Such control strategies are realized by the proposed control method to increase resilience of the system. For these purposes, all resources and loads in DCMG and NGs are equipped with individual controllers. Then, a central control unit analyzes, monitors, and regularizes performance of individual controllers in DCMG and NGs. Nonlinear simulations show the proposed model can effectively control DCMG and NGs under normal and critical conditions.

关键词： Control system DC microgrid nanogrid resilience

拦河闸和其他潮汐能量方案:水动力学和能量输出模拟（英文）

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

拦河闸和其他潮汐能量方案:水动力学和能量输出模拟（英文）

Production optimization in a fractured carbonate reservoir with high producing GOR

2009水资源与可持续发展高层论坛

作者： Roger A.Falconer reza ahmadian Hydro-environmental Research Centre School of EngineeringCardiff UniversityCardiff CF24 3AAUK

＜正＞Details are given herein of the current main proposals for tidal energy provision from the Severn Estuary,in the UK,with particular emphasis being focused on the Severn Barrage project,as originally promoted by the Severn Tidal Power *** particular, emphasis has focused on assessing the potential hydro-environmental impacts and power outputs of a barrage across the estuary,with an unstructured grid,high resolution,model being developed and applied to the estuary to assess the implications of each of five shortlisted proposed schemes on the hydrodynamic,geomorphologic,flood risk and faecal indicator organism changes within the *** outline is given of recent research on power refinements to the model to assess the options for power *** results show that the Severn Barrage has the potential to reduce the tidal currents in a highly dynamic *** leads to reduced suspended sediment loads（particularly upstream of the barrage）,increased light penetration within the water column and,potentially,an increase in the benthic bio-diversity and the level of aquatic life in the *** results also show that the Severn Barrage will reduce the risk of flooding markedly upstream of the barrage and to a lesser extent downstream of the *** contrast the alternative options have far less impact on flood risk *** addition to the Severn Barrage some results are shown herein for a typical lagoon option,namely the Fleming Lagoon.

关键词： marine renewable energy Severn Estuary hydrodynamic processes tidal power finite volume models

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Energy Geoscience

Energy Geoscience 2024年第4期5卷 224-239页

作者： Amin Izadpanahi reza Azin Shahriar Osfouri reza Malakooti Escola Politécnica Universidade de São PauloBrazil Department of Petroleum Engineering Faculty of Petroleum Gas&Petrochemical EngineeringPersian Gulf UniversityBushehrIran Department of Chemical Engineering Faculty of Petroleum Gas&Petrochemical EngineeringPersian Gulf UniversityBushehrIran Computer Modelling Group LondonUK

The Gas-Oil Ratio(GOR)is a crucial production parameter in oil *** increase in GOR results in higher gas production and lower oil production,potentially leading to well shut-ins due to economic *** study focuses on a real fractured oil field that requires urgent production operations to reduce the producing *** this study,the static model for the field was developed using commercial software,involving steps such as data collection,fault modeling,meshing,and statistical analysis to prepare for dynamic *** dynamic model incorporates geometry,gridding,and rock properties from the static model,utilizing a dual-porosity approach for the naturally fractured reservoir and the Peng-Robinson equation for fluid phase *** reservoir conditions,production history,and rock-fluid interactions were defined,with relative permeability curves indicating a water-wet reservoir and low critical gas saturation affecting the *** better understand the relationship between reservoir and production parameters,a detailed sensitivity analysis was performed using the Response Surface Methodology(RSM).Following the sensitivity analysis,a history matching process was conducted using the Designed Exploration and Controlled Evolution(DECE)optimizer to validate the model for future *** operational scenarios were defined to decrease the production GOR and enhance final recovery from the *** results indicate that the water injection scenario is effective in preventing the GOR increase by maintaining reservoir pressure,thereby sustaining production over a longer *** scenario also improves oil recovery by approximately 6%compared to the base ***,optimization was carried out using the DECE optimizer for each scenario to fine-tune the operational *** goal was to maximize oil revenue for each scenario during the optimization *** study stands out as one of the few that provides a comprehensive analysis

关键词： Reservoir simulation Sensitivity analysis Response surface methodology High gas-oil ratio Production optimization

Interplay between temperature-dependent strengthening mechanisms and mechanical stability in high-performance austenitic stainless steels

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

International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2182-2188页

作者： Mohammad Javad Sohrabi Hamed Mirzadeh Saeed Sadeghpour Milad Zolfipour Aghdam Abdol reza Geranmayeh reza Mahmudi School of Metallurgy and Materials Engineering College of EngineeringUniversity of Tehran14395-515 TehranIran Centre for Advanced Steels Research Materials and Mechanical EngineeringUniversity of Oulu90014 OuluFinland Department of Mechanical Engineering College of EngineeringUniversity of Tehran14395-515 TehranIran

The effects of deformation temperature on the transformation-induced plasticity(TRIP)-aided 304L,twinning-induced plasti-city(TWIP)-assisted 316L,and highly alloyed stable 904L austenitic stainless steels were compared for the first time to tune the mechan-ical properties,strengthening mechanisms,and strength-ductility *** this purpose,the scanning electron microscopy(SEM),electron backscattered diffraction(EBSD),X-ray diffraction(XRD),tensile testing,work-hardening analysis,and thermodynamics calcu-lations were *** induced plasticity effects led to a high temperature-dependency of work-hardening behavior in the 304L and 316L stainless *** the deformation temperature increased,the metastable 304L stainless steel showed the sequence of TRIP,TWIP,and weakening of the induced plasticity mechanism;while the disappearance of the TWIP effect in the 316L stainless steel was also ***,the solid-solution strengthening in the 904L superaustenitic stainless steel maintained the tensile properties over a wide temper-ature range,surpassing the performance of 304L and 316L stainless *** this regard,the dependency of the total elongation on the de-formation temperature was less pronounced for the 904L alloy due to the absence of additional plasticity *** results re-vealed the importance of solid-solution strengthening and the associated high friction stress for superior mechanical behavior over a wide temperature range.

关键词： austenitic stainless steels mechanical behavior stacking fault energy metastability mechanical twinning