检索结果-南通市图书馆

Elasto-inertial focusing and particle migration in high aspect ratio microchannels for highthroughput separation

microsystems & Nanoengineering 2024年第3期10卷 381-394页

作者： Selim Tanriverdi Javier Cruz Shahriar Habibi Kasra Amini martim Costa Fredrik Lundell gustaf mårtensson Luca Brandt Outi Tammisola Aman Russom Division of Nanobiotechnology Department of Protein ScienceScience for Life LaboratoryKTH Royal Institute of TechnologySolna 17165Sweden Division of microsystems Technology Department of Materials Science and EngineeringUppsala UniversityUppsala 75237Sweden FLOW and SeRC(Swedish e-Science Research Centre) Department of Engineering MechanicsRoyal Institute of TechnologyStockholm SE 10044Sweden FLOW and Fluid Physics Laboratory Department of Engineering MechanicsRoyal Institute of TechnologyStockholmSweden Wallenberg Wood Science Center Royal Institute of TechnologyStockholm SE 10044Sweden Department of Energy and Process Engineering Norwegian University of Science and Technology(NTNU)TrondheimNorway AImES Center for the Advancement of Integrated medical and Engineering Sciences at Karolinska Institutet and KTH Royal Institute of Technology StockholmSweden

The combination of flow elasticity and inertia has emerged as a viable tool for focusing and manipulating particles using *** there is considerable interest in the field of elasto-inertial microfluidics owing to its potential applications,research on particle focusing has been mostly limited to low Reynolds numbers(Remigration toward equilibrium positions has not been extensively *** this work,we thoroughly studied particle focusing on the dynamic range of flow rates and particle migration using straight microchannels with a single inlet high aspect *** initially explored several parameters that had an impact on particle focusing,such as the particle size,channel dimensions,concentration of viscoelastic fluid,and flow *** experimental work covered a wide range of dimensionless numbers(0.05mbermbermberm *** results showed that the particle size played a dominant role,and by tuning the parameters,particle focusing could be achieved at Reynolds numbers ranging from 0.2(1μL/min)to 85(250μL/min).Furthermore,we numerically and experimentally studied particle migration and reported differential particle migration for high-resolution separations of 5μm,7μm and 10μm particles in a sheathless flow at a throughput of 150μL/*** work elucidates the complex particle transport in elasto-inertial flows and has great potential for the development of high-throughput and high-resolution particle separation for biomedical and environmental applications.

关键词： particle separation straight

来源：

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

Inkjet printing technology for increasing the I/O density of 3D TSV interposers

引用

microsystems & Nanoengineering 2017年第1期3卷 349-357页

作者： Behnam Khorramdel Jessica Liljeholm mika-matti Laurila Toni Lammi gustaf mårtensson Thorbjörn Ebefors Frank Niklaus matti mäntysalo Department of Electronics and Communications Engineering Tampere University of TechnologyKorkeakoulunkatu 3Tampere 33720Finland Silex microsystems AB Bruttovägen 1Järfälla/Stockholm SE-17526Sweden micro and Nanosystem KTH Royal Institute of TechnologyOsquldas väg 1010044 StockholmSweden EmSL Chalmers University of TechnologyKemivägen 941296 GöteborgSweden mycronic AB Nytorpsvägen 918303 TäbySweden

Interposers with through-silicon vias(TSVs)play a key role in the three-dimensional integration and packaging of integrated circuits and microelectromechanical *** the current practice of fabricating interposers,solder balls are placed next to the vias;however,this approach requires a large foot print for the input/output(I/O)***,in this study,we investigate the possibility of placing the solder balls directly on top of the vias,thereby enabling a smaller pitch between the solder balls and an increased density of the I/O *** reach this goal,inkjet printing(that is,piezo and super inkjet)was used to successfully fill and planarize hollow metal TSVs with a dielectric *** under bump metallization(UBm)pads were also successfully printed with inkjet technology on top of the polymer-filled vias,using either Ag or Au *** reliability of the TSV interposers was investigated by a temperature cycling stress test(−40℃ to+125℃).The stress test showed no impact on DC resistance of the TSVs;however,shrinkage and delamination of the polymer was observed,along with some micro-cracks in the UBm *** proof of concept,SnAgCu-based solder balls were jetted on the UBm pads.

关键词： heterogeneous three-dimensional(3D)integration inkjet printing interposer microelectromechanical system(mEmS) reliability super inkjet(SIJ) through silicon via(TSV)

来源：

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

Water, energy and food interactions --Challenges and opportunities

引用

Frontiers of Environmental Science & Engineering 2013年第5期7卷 787-793页

作者： gustaf OLSSON Department of measurement Technology and Industrial Electrical Engineering Lund University SE-22100 Lund Sweden

Water and energy are inextricably linked, and as a consequence both have to be addressed together. This is called the water-energy nexus. When access to either is limited, it becomes obvious that it is necessary to consider their interdependence. Population growth, climate change, urbanization, increasing living standards and food con- sumption will require an integrated approach where food, water and energy security are considered together. In this paper we examine water, energy and food security and their couplings. The nexus also creates conflicts between water use, energy extraction and generation as well as food production. Some of these conflicts are illustrated. It is argued that there is an urgent need for integrated planning and operation. Not only will better technology be needed, but also better integration of policies, organizations and political decisions.

关键词： water security energy security food security,water-energy nexus water conflicts

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Activated Natural Killer Cells Hit Neurogenesis in the Aging Brain

引用

Neuroscience Bulletin 2021年第7期37卷 1072-1074页

作者： Angelica Cuapio Hans-gustaf Ljunggren Center of Infectious medicine Department of Medicine HuddingeKarolinska Institutet14152 StockholmSweden

Why neurogenesis is attenuated in elderly individuals is an intriguing question that has raised renewed *** associated with declined neurogenesis in the aged brain have been attributed to inflammatory cytokines[1].more recently,a specific role for interferon-y(IFN-y)produced by CD8-expressing cytotoxic T cells has been implicated[2].These observations suggest a scenario in which neurogenesis,at least in part,is regulated by immune cells within the aging *** raises several interesting questions with regards to the characteristics of specific immune cells within the brain,the signals for their expansion and maintenance,and their role in affecting neurogenesis and cognition during normal brain aging.

关键词： interferon Killer attributed

来源：

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

GRID-INDEPENDENT CONSTRUCTION OF mULTISTEP mETHODS

引用

Journal of Computational mathematics 2017年第5期35卷 672-692页

作者： Carmen Arevalo gustaf Soderlind Numerical Analysis Centre for Mathematical Sciences Box 118 SE-22100 Lund Sweden.

A new polynomial formulation of variable step size linear multistep methods is pre- sented, where each k-step method is characterized by a fixed set of k - 1 or k parameters. This construction includes all methods of maximal order （p = k for stiff, and p = k ＋ 1 for nonstiff problems）. Supporting time step adaptivity by construction, the new formulation is not based on extending classical fixed step size methods; instead classical methods are obtained as fixed step size restrictions within a unified framework. The methods are imple- mented in mATLAB, with local error estimation and a wide range of step size controllers. This provides a platform for investigating and comparing different multistep method in realistic operational conditions. Computational experiments show that the new multi- step method construction and implementation compares favorably to existing software, although variable order has not yet been included.

关键词： Linear multistep methods Variable step size Adaptive step size Step sizecontrol Explicit methods Implicit methods Nonstiff methods Stiff methods Initial valueproblems Ordinary differential equations Differential-algebraic equations Implementa-tion.

来源：

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

Highly toxic Aβ begets more Aβ

引用

Neural Regeneration Research 2024年第9期19卷 1871-1872页

作者： merc m.Kemeh Noel D.Lazo gustaf H.Carlson School of Chemistry and Biochemistry Clark UniversityWorcesterMAUSA

Alzheimer’s disease(AD)is the most common form of dementia-the 7th leading cause of death *** the tissue level,AD is characterized by the presence of extracellular amyloid plaques that are comprised primarily of the amyloid-βpeptide(Aβ),and by intraneuronal neurofibrillary tangles composed of *** genetics of early-onset AD and longitudinal brain-imaging studies of late-onset AD indicate that extracellular Aβdeposition,in general,precedes neurofibrillary tangle formation in neurons(Hampel et al.,2021;Young-Pearse et al.,2023).

关键词： Aβ tau Alzheimer death

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Diet shift in bank voles induced by competition from grey-sided voles?

引用

Integrative Zoology 2019年第4期14卷 376-382页

作者： magnus mAGNUSSON gustaf SAmELIUS Birger HÖRNFELDT Frauke ECKE Department of Wildlife Fishand Environmental StudiesSwedish University of Agricultural SciencesUmeåSweden 2Snow Leopard Trust SeattleUSA Department of Ecology Swedish University of Agricultural SciencesRiddarhyttanSweden

Grey-sided voles(myodes rufocanus)and bank voles(myodes glareolus)co-exist in boreal forests in northern *** studies suggest that the 2 species interact interspecifically,the grey-sided vole being the dominant *** tested the hypothesis that bank voles shift their diet due to competition with the dominant grey-sided vole by studying stable isotope ratios in both *** samples were taken from voles in patches of old forest occupied by only bank voles and patches of old forest occupied by both grey-sided voles and bank *** found that:(i)stable isotope ratios of bank voles differed in areas with and without grey-sided voles;and that(ii)the stable isotope ratios of bank voles were more similar to those of grey-sided voles in areas where grey-sided voles were *** data suggests that grey-sided voles forced bank voles to change their diet due to interspecific competition.

关键词： competition diet shift myodes glareolus myodes rufocanus stable isotopes

来源：

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

Fatigue of 0.55C-1.72Si Steel with Tempered martensitic and Carbide-Free Bainitic microstructures

引用

Acta metallurgica Sinica(English Letters) 2014年第1期27卷 55-62页

作者： Alejandro Leiro Arash Roshan Karl-gustaf Sundin Esa Vuorinen Braham Prakash Department of Engineering Sciences and mathematics Lule University of Technology

High-Si spring steel was heat treated in three different ways： Quenching and tempering at 460 ℃ to obtain a tempered martensite microstructure, and austempering at 300 and 350 ℃, respectively, to obtain two different carbide-free bainitic microstructures. In the steel austempered at 350 ℃, both the bainite lath thickness and retained austenite content were higher than those of the steel austempered at 300 ℃. Rotating-bending fatigue tests were done in order to evaluate the effect of each heat treatment on the high-cycle fatigue behavior of the steel. When the austempering temperature was 300 ℃, the endurance limit was increased by 25% despite a 5% reduction in tensile strength when compared with that of the quenched and tempered steel. The relationship between endurance limit [Rfat （50~）] and ultimate tensile strength （Rm） was higher for the austempered samples in comparison with that of the quenched and tempered material. Therefore, it is believed that the presence of retained austenite affects the relationship between endurance limit and tensile strength.

关键词： Steels Fatigue Carbide-free bainite TRIP effect

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Short-term prediction of influent flow rate and ammonia concentration in municipal wastewater treatment plants

引用

Frontiers of Environmental Science & Engineering 2014年第1期8卷 128-136页

作者： Shuai mA Siyu ZENG Xin DONG Jining CHEN gustaf OLSSON State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing 100084 China Department of Industrial Electrical Engineering and Automation Lurid University Lund SE-22100 Sweden

The prediction of the influent load is of great importance for the improvement of the control system to a large wastewater treatment plant. A systematic data analysis method is presented in this paper in order to estimate and predict the periodicity of the influent flow rate and ammonia （NH3） concentrations： 1） data filtering using wavelet decomposition and reconstruction; 2） typical cycle identification using power spectrum density analysis; 3） fitting and prediction model establishment based on an autoregressive model. To give meaningful information for feedforward control systems, predictions in different time scales are tested to compare the corresponding predicting accuracy. Considering the influence of the rainfalls, a linear fitting model is derived to estimate the relationship between flow rate trend and rain events. measurements used to support coefficient fitting and model testing are acquired from two municipal wastewater treatment plants in China. The results show that 1） for both of the two plants, the periodicity affects the flow rate and NH3 concentrations in different cycles （especially cycles longer than 1 day）; 2） when the flow rate and NH3 concentrations present an obvious periodicity, the decreasing of prediction accuracy is not distinct with increasing of the prediction time scales; 3） the periodicity influence is larger than rainfalls; 4） the rainfalls will make the periodicity of flow rate less obvious in intensive rainy periods.

关键词： influent load prediction wavelet de-noising,power spectrum density autoregressive model time-frequency analysis wastewater treatment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

modification of the activated sludge model for chemical dosage

引用

Frontiers of Environmental Science & Engineering 2015年第4期9卷 694-701页

Full-scale experiments have been carried out to adapt the activated sludge model ASm2d to include the influence of metal dosage （Fe^3＋ and Al^3＋） for phosphorus removal. Phosphorus removal rates, nitrification rates, as well as pH and sludge settling performance, were evaluated as functions of the metal dosages. Furthermore, models relating certain parameters to the dosage of chemicals have been derived. Corresponding parameters in the ASm2d and the secondary settler models, included in the Benchmark Simulation model No 1 （BSm1）, have been modified to take the metal influence into consideration. Based on the effluent limits and penalty policy of China, an equivalent evaluation method was derived for the total cost assessment. A large number of 300-day steady-state and 14-day open-loop dynamic simulations were performed to demonstrate the difference in behavior between the original and the modified BSm1. The results show that 1） both in low and high mole concentrations, Fe^3＋ addition results in a higher phosphorus removal rate than Al^3＋; 2） the sludge settling velocity will increase due to the metal addition; 3） the respiration rate of the activated sludge is decreased more by the dosage of Al^3＋ than Fe^3＋; 4） the inhibition of Al^3＋ on the nitrification rate is stronger than that of Fe^3＋; 5） the total operating cost will reach the minimum point for smaller dosages of Fe^3＋, but always increase with Al^3＋ addition.

关键词： activated sludge model chemical precipitation benchmark simulation model phosphorus removal,respiratory rate sludge settling

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：