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IEEE PhotonicsGlobal@Singapore, IPGC

作者： Dong Wei Hirokazu Matsumoto Global Center of Excellence Program-Mechanical Systems Innovation School of Engineering University of Tokyo Bunkyo Tokyo Japan Department of Precision Engineering University of Tokyo Bunkyo Tokyo Japan

A new scheme for designing a spatial light source for depth direction coherence control is proposed. This method is based on a combination of spatial coherence phenomena and the superposition principle. A computer-generated light source is projected onto a moving diffuser in order to realize multiple coherence peaks in the depth direction by synthesizing the longitudinal coherence function. Using this light source, we can shape a coherence function with multiple peaks, which are equidistant and have different strengths for distinguishability. This method may provide a new way of performing long-range depth direction measurements.

关键词： Spatial coherence

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Effects of Wind Stresses and Progressive Waves on Surf-Zone Currents

Effects of Wind Stresses and Progressive Waves on Surf-Zone ...

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Novel Intelligent and Leading Emerging Sciences Conference (NILES)

作者： Mohamed Elshabrawy Osama Khalid Mamdouh Zaki Khaled Fasseh Mahmoud E. Said Faculty of Engineering Cairo University Giza Egypt Mechanical Engineering Program School of Engineering and Applied Sciences Nile University Egypt Smart Engineering Systems Research Center (SESC) Nile University Giza Egypt

In this paper, A numerical model based on the shallow water equations is derived to study the combined effects of wind and progressive gravity waves on surf-zone currents. The wind has temporal and spatial variations. The combined effects of spatially and temporal varying wind and waves on the surf-zone currents are investigated by considering different wave incident angles and wind stresses. Numerical results of the current distribution demonstrate the role of the basin topography, coastal configuration and the combined effect of wave radiation and wind stresses on the surf-zone currents distribution. Also, the water surface elevation emphasizes the role of the pressure gradient force due to the non-penetration condition at the coastal boundary.

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mechanical Properties of Nature Graphite Compacts Electroplated by Copper

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AIP Conference Proceedings 2009年第1期1169卷 93-100页

作者： Chan‐Chao Wen Hung Tsou Chia‐Hung Pai Wen‐Shyong Kuo aPh.D. Program in Mechanical and Aeronautical Engineering Feng Chia University 100 WenHwa Rd Seatwen Taichung Taiwan bDepartment of Aerospace and systems Engineering Feng Chia University 100 WenHwa Rd Seatwen Taichung Taiwan

This work examines the processing and mechanical properties of graphite compacts electroplated by a copper layer. Natural graphite (NG) flakes have been compressed to make graphite compacts. A copper electrodeposit has been applied to the surface of the graphite compact in order to reinforce the mechanical properties and prevent the graphite particles from peeling off. The natural graphite flakes were stacked layer by layer in order within the graphite compact. The effects of different electroplating conditions on the mechanical properties of the graphite compacts were studied. The density of the compact reaches to a limit value when the pressure was above 100 MPa. The tests indicated that the compressive, flexural and shear strengths increase at least 150% with the copper layer. The damage mechanisms in the compacts were investigated by using a scanning electron microscopy.

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Characterizing cellular mechanical phenotypes with mechanonode-pore sensing

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Microsystems & Nanoengineering 2018年第1期4卷 438-449页

作者： Junghyun Kim Sewoon Han Andy Lei Masaru Miyano Jessica Bloom Vasudha Srivastava Martha R.Stampfer Zev J.Gartner Mark A.LaBarge Lydia L.Sohn Department of Mechanical Engineering University of California at BerkeleyBerkeleyCA 94720-1740USA Department of Bioengineering University of California at BerkeleyBerkeleyCA 94720-1762USA Department of Population Sciences Beckman Research InstituteCity of HopeDuarteCA 91010USA Department of Pharmaceutical Chemistry University of CaliforniaSan FranciscoSan FranciscoCA 94143USA Biological Systems and Engineering Division Lawrence Berkeley National LaboratoryCA 94720USA Graduate Program in Bioengineering University of CaliforniaBerkeleyand University of CaliforniaSan FranciscoBerkeleyCA 94720USA

The mechanical properties of cells change with their differentiation,chronological age,and malignant ***,these properties may be useful label-free biomarkers of various functional or clinically relevant cell ***,we demonstrate mechano-node-pore sensing(mechano-NPS),a multi-parametric single-cell-analysis method that utilizes a four-terminal measurement of the current across a microfluidic channel to quantify simultaneously cell diameter,resistance to compressive deformation,transverse deformation under constant strain,and recovery time after *** define a new parameter,the whole-cell deformability index(wCDI),which provides a quantitative mechanical metric of the resistance to compressive deformation that can be used to discriminate among different cell *** wCDI and the transverse deformation under constant strain show malignant MCF-7 and A549 cell lines are mechanically distinct from non-malignant,MCF-10A and BEAS-2B cell lines,and distinguishes between cells treated or untreated with cytoskeleton-perturbing small *** categorize cell recovery time,ΔT_(r),as instantaneous(ΔTr~0 ms),transient(ΔT_(r)≤40 ms),or prolonged(ΔT_(r)>40 ms),and show that the composition of recovery types,which is a consequence of changes in cytoskeletal organization,correlates with cellular *** the wCDI and cell-recovery time,mechano-NPS discriminates between sub-lineages of normal primary human mammary epithelial cells with accuracy comparable to flow cytometry,but without antibody ***-NPS identifies mechanical phenotypes that distinguishes lineage,chronological age,and stage of malignant progression in human epithelial cells.

关键词： microfluidics mechanical phenotyping node-pore sensing biosensors label-free

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Economic modeling of a seawater pumped-storage system in the context of São Miguel

Economic modeling of a seawater pumped-storage system in the...

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2008 IEEE International Conference on Sustainable Energy Technologies, ICSET 2008

作者： Pina, André Ioakimidis, Christos S. Ferrão, Paulo Sustainable Energy Systems within the MIT Portugal Program and the Centre for Innovation Technology and Policy Research at Instituto Superior Técnico Technical University of Lisbon Portugal Department of Mechanical Engineering at Instituto Superior Técnico Technical University of Lisbon with the Centre for Innovation Technology and Policy Research Av. Rovisco Pais 1049-001 Lisboa Portugal Centre for Innovation Department of Mechanical Engineering at Instituto Superior Técnico Technical University of Lisbon Portugal

ISBN: (纸本)9781424418886

The energy situation in remote islands is becoming critical with high fuel import costs preventing the islands from developing at a faster pace. São Miguel is an island located in the middle of the Atlantic with extensive renewable resources whose utilization is limited by low base load levels and lack of storage facilities. Using an economic optimization model, this work suggests using a seawater pumped-storage system to increase the penetration of renewable energy in the system. Several scenarios are analyzed and compare to determine the sensitivity of the solution and determine if it is a good option. © 2008 IEEE.

关键词： Seawater

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Leveraging viscous peeling in soft actuators and reconfigurable microchannel networks

arXiv

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arXiv 2019年

作者： Salem, Lior Gamus, Benny Or, Yizhar Gat, Amir D. Technion Autonomous Systems Program Technion − Israel Institute of Technology Haifa Israel Faculty of Mechanical Engineering Technion − Israel Institute of Technology Haifa Israel

The research fields of microfluidics and soft robotics both involve complex small-scale internal channel networks, embedded within a solid structure. This work examines leveraging viscous peeling as a mechanism to create and activate soft actuators and microchannel networks, including complex elements such as valves, without the need for fabrication of structures with micron-scale internal cavities. We consider configurations composed of an internal slender structure embedded within another elastic solid. Pressurized viscous fluid is introduced into the interface between the two solids, thus peeling the two elastic structures and creating internal cavities. Since the gap between the solids is determined by the externally applied pressure, the characteristic size of the fluidic network may vary in time and be much smaller than the resolution of the fabrication method. This work presents a model for the highly nonlinear elastic-viscous dynamics governing the flow and deformation of such configurations. Fabrication and experimental demonstrations of micron-scale valves and channel-networks created from millimeter scale structures are presented, as well as the transient dynamics of viscous peeling based soft actuators. The experimental data is compared with the suggested model, showing very good agreement. Copyright © 2019, The Authors. All rights reserved.

关键词： Microchannels

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Engineers and technological literacy

Engineers and technological literacy

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114th Annual ASEE Conference and Exposition, 2007

作者： Newberry, Byron Baylor University United States Department of Mechanical Engineering Baylor University United States Baylor Great Texts Program United States Texas Tech University University of Texas United States Japan IEEE Society for Social Implications of Technology United States L3 Communications Integrated Systems

In his book Designing Engineers, engineer Louis Bucciarelli answers the question "Do you know how your telephone works?" with the rhetorical rebuttal, "Does anyone know how their telephone works?" At first pass, we might be inclined to assume that engineers, scientists, or computer scientists are by default technologically literate - if anyone knows how the telephone works, surely it is them. But the intent of Bucciarelli's question is to point to a deeper ambiguity about what is means to "know" how something works, even in the case of a technical expert. Essentially what he is asking is "Is anyone really technologically literate?" This is the question I will explore philosophically in this paper, with particular focus on the technological literacy of technological professionals such as engineers. I will begin by examining the definitions of, and criteria for, technological literacy provided by the NAE report Technically Speaking. I will examine the extent to which those criteria might be satisfied, both for lay people as well as technological professionals. The Technically Speaking report describes some general obstacles to achieving technological literacy. I will discuss these challenges and offer some additional ones, including some to which technological professional contribute, and others which primarily affect technological professionals. I will close by offering some general observations from an engineer's perspective on the definition and goals of technological literacy. © American Society for engineering Education, 2007.

关键词： engineering education

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Field study and analytical assessment of two exterior walls in a hot and humid climate 14

Field study and analytical assessment of two exterior walls ...

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14th International Conference on Thermal Performance of the Exterior Envelopes of Whole Buildings 2019

作者： Nieto, Alejandra Desjarlais, Andre Miller, William Rockwool MiltonON Canada Building Envelope Systems Research Program Oak Ridge National Laboratory Oak RidgeTN United States Oak Ridge National Laboratory Oak RidgeTN United States School of Architecture and Design and in the Mechanical Aerospace and Biomedical Engineering Department KnoxvilleTN United States

Two wall systems were exposed for one-full year to the hot and humid climate of Charleston, SC. Both walls were installed on the southern exposure of the Natural Exposure Test (NET) facility. The first wall is a mass wall (CMU), fully grouted with acrylic stucco finish. The interior of the assembly consists of a layer of vapor permeable rigid insulation and gypsum board finished with latex paint. The second wall is a steel framed wall with semi-rigid batt insulation. The exterior of the assembly consists of clay brick cladding, an air space, vapor permeable semi-rigid insulation and exterior gypsum. The interior of the assembly is gypsum board attached to a steel frame and finished with latex paint. Both walls were insulated using vapor permeable stone wool insulation, applicable to the type of construction. The relative humidity, moisture content and overall heat flux within the assemblies was monitored and analyzed. Field data did not reveal evidence for the potential of moisture condensation in either wall assembly. Although, higher levels of relative humidity were found in both walls during certain times, with the highest values observed during the summer months when the partial pressure gradient from outside to inside would drive moisture into the wall and on into the conditioned space. The relative humidity on the interior side of the gypsum board was found to be highest for the steel framed wall with clay brick cladding, as compared to the mass wall. WUFI ORNL simulations were conducted using the measured indoor and outdoor temperatures and relative humidities as boundary conditions. Simulations showed the clay brick was often wet due to nighttime sky radiation which drops the wall temperature below the dew point temperature of the outdoor air. Moisture content for the layers of mass wall construction show that water diffuses primarily from the exterior toward the interior. © 2019 ASHRAE.

关键词： Moisture

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Classification of the Structural Integrity by the General Vibration Method

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Procedia Computer Science 2019年 157卷 382-387页

作者： Fergyanto E. Gunawan Benfano Soewito Nico Surantha Tuga Mauritsius Nobumasa Sekishita Industrial Engineering Department BINUS Graduate Program - Master of Industrial Engineering Bina Nusantara University Jakarta Indonesia 11480 Computer Science Department BINUS Graduate Program - Master of Computer Science Bina Nusantara University Jakarta Indonesia 11480 Information Systems Information Department BINUS Graduate Program - Master of Information Systems Management Bina Nusantara University Jakarta Indonesia 11480 Department of Mechanical Engineering Toyohashi University of Technology Toyohashi Aichi 441-8580 Japan

Traditionally, for the purpose of classifying the integrity of an engineering structure, one may use the information of the natural frequencies or mode shapes or some other measures derived from the two. In this research, we propose a classification method on the basis of the general vibration model. The general vibration model is essentially a set of differential equations describing the dynamics of the structure under consideration. For the purpose of damage detection, a deviation of the general vibration model from the dynamic equilibrium point marks the occurrence of the damage. To demonstrate the effectiveness of the method, we study two simplest dynamical systems consisting of one- and two-concentrated masses subjected to a prescribed dynamic load. The structural damages are introduced artificially by reducing the stiffness of spring in the structures. We find that the general vibration model is more sensitive to damages than the traditional methods.

关键词： General Vibration Model Structural Integrity Structural Health Monitoring Power Spectral Density Damage Index

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A Method for Determining the Crack Arrest Fracture Toughness of Ferritic Materials 19

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19th National Symposium on Fracture Mechanics

作者： Barker, D.B. Chona, R. Corwin, W.R. Fourney, W.L. Irwin, G.R. Marschall, C.W. Rosenfield, A.R. Wessel, E.T. Department of Mechanical Engineering University of Maryland College ParkMD20742 United States Department of Mechanical Engineering Texas A & M University College StationTX77843 United States Heavy Section Steel Technology Program Oak Ridge National Laboratory Martin Marietta Energy Systems Oak RidgeTN37831 United States Physical Metallurgy Section Battelle Columbus Division ColumbusOH43201 United States Haines City FL33844 United States

ISBN: (纸本)9780803109728

This paper summarizes the results from a round robin test program that was conducted from 1983 through 1985 to evaluate a proposed ASTM standard test method for determining the crack arrest fracture toughness of ferritic materials. The round robin attracted a total of 27 participants from the United States, Canada, Europe, and Japan, each of whom agreed to test three specimens of A514 bridge steel, three specimens of A588 bridge steel, and six specimens of A533 Grade B, Class 1 reactor pressure vessel steel. Twenty-one participants had completed their testing and forwarded test results when this paper was written, which provided a data base consisting of 54 test results for each of the bridge steels at - 30°C, 70 test results for the reactor steel at 10°C, and 65 test resuhs for the reactor steel at 25°C. This paper summarizes the test procedure followed in the round robin, discusses the results obtained, and provides the rationale for the modifications to the test method that were recommended in light of the experience gained from this test program. The test procedure has since been revised and is now proposed as the ASTM Test for Determining the Plane-Strain Crack-Arrest Fracture Toughness, K,,, of Ferritic Steels (E 1221). Copyright 1988 by ASTM International.

关键词： Fracture toughness

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