Open Access. Powered by Scholars. Published by Universities.®

Engineering Physics Commons

Open Access. Powered by Scholars. Published by Universities.®

1,383 Full-Text Articles 3,287 Authors 272,107 Downloads 94 Institutions

All Articles in Engineering Physics

Faceted Search

1,383 full-text articles. Page 6 of 54.

24 - Using 3d Printing To Optimize Research In X-Ray Fluorescence Spectroscopy, Mark Leggiero 2018 University of North Georgia

24 - Using 3d Printing To Optimize Research In X-Ray Fluorescence Spectroscopy, Mark Leggiero

Georgia Undergraduate Research Conference (GURC)

Research in the physical sciences often requires elaborate instruments with expensive equipment, and fixtures and mounting for these instruments can often be difficult to obtain. With great developments in the consumer market for digital manufacturing, 3D printing has the potential to be a vital resource in any physical science research space for creating these necessities. The benefits of 3D printing include the small form factor of the machines, low material costs, and the ability to allow rapid prototyping in designing essential parts to research. The goal of this project is to explore the applications and benefits of 3D printing and ...


Intercalated Rare-Earth Metals Under Graphene On Sic, Nathaniel A. Anderson, Myron Hupalo, David Keavney, Michael C. Tringides, David Vaknin 2018 Iowa State University and Ames Laboratory

Intercalated Rare-Earth Metals Under Graphene On Sic, Nathaniel A. Anderson, Myron Hupalo, David Keavney, Michael C. Tringides, David Vaknin

Ames Laboratory Accepted Manuscripts

Intercalation of rare earth metals (RE = Eu, Dy, and Gd) is achieved by depositing the RE metal on graphene that is grown on silicon-carbide (SiC) and by subsequent annealing at high temperatures to promote intercalation. STM images of the films reveal that the graphene layer is defect free and that each of the intercalated metals has a distinct nucleation pattern. Intercalated Eu forms nano-clusters that are situated on the vertices of a Moirè pattern, while Dy and Gd form randomly distributed nano-clusters. X-ray magnetic circular dichroism (XMCD) measurements of intercalated films reveal the magnetic properties of these REs nano-clusters ...


Probabilities Involving Standard Trirectangular Tetrahedral Dice Rolls, Rulon Olmstead, DonEliezer Baize 2018 Brigham Young University-Hawaii

Probabilities Involving Standard Trirectangular Tetrahedral Dice Rolls, Rulon Olmstead, Doneliezer Baize

Rose-Hulman Undergraduate Mathematics Journal

The goal is to be able to calculate probabilities involving irregular shaped dice rolls. Here it is attempted to model the probabilities of rolling standard tri-rectangular tetrahedral dice on a hard surface, such as a table top. The vertices and edges of a tetrahedron were projected onto the surface of a sphere centered at the center of mass of the tetrahedron. By calculating the surface areas bounded by the resultant geodesics, baseline probabilities were achieved. Using a 3D printer, dice were constructed of uniform density and the results of rolling them were recorded. After calculating the corresponding confidence intervals, the ...


Estimation Of Atmospheric Turbulence Using Differential Motion Of Extended Features In Time-Lapse Imagery, Santasri Bose-Pillai, Jack E. McCrae, Christopher A. Rice, Ryan A. Wood, Conner E. Murphy, Steven T. Fiorino 2018 Air Force Institute of Technology

Estimation Of Atmospheric Turbulence Using Differential Motion Of Extended Features In Time-Lapse Imagery, Santasri Bose-Pillai, Jack E. Mccrae, Christopher A. Rice, Ryan A. Wood, Conner E. Murphy, Steven T. Fiorino

Faculty Publications

We address the design, development, and testing of a pointer/tracker as a probe beam for the purpose of making high-speed, aero-optical measurements of the flow over a scaled beam director turret. The tracker uses retro-reflection of the probe beam off of a Reflexite annulus surrounding the turret. The constraints of the design required a near-total-commercial off the shelf system that could be quickly installed and removed in a rented aircraft. Baseline measurements of environmental vibrations are used to predict pointing performance; mitigation of line-of-sight jitter on the probe beam is achieved through passive isolation and the design of relay ...


Lattice Instability During Solid-Solid Structural Transformations Under A General Applied Stress Tensor: Example Of Si I → Si Ii With Metallization, Nikolai A. Zarkevich, Hao Chen, Valery I. Levitas, Duane D. Johnson 2018 Ames Laboratory

Lattice Instability During Solid-Solid Structural Transformations Under A General Applied Stress Tensor: Example Of Si I → Si Ii With Metallization, Nikolai A. Zarkevich, Hao Chen, Valery I. Levitas, Duane D. Johnson

Aerospace Engineering Publications

The density functional theory was employed to study the stress-strain behavior and elastic instabilities during the solid-solid phase transformation (PT) when subjected to a general stress tensor, as exemplified for semiconducting Si I and metallic Si II, where metallization precedes the PT, so stressed Si I can be a metal. The hydrostatic PT occurs at 76 GPa, while under uniaxial loading it is 11 GPa (3.7 GPa mean pressure), 21 times lower. The Si I → Si II PT is described by a critical value of the phase-field’s modified transformation work, and the PT criterion has only two parameters ...


Magnetic And Electrocatalytic Properties Of Transition Metal Doped Mos2 Nanocrystals, L. M. Martinez, J. A. Delgado, C. L. Saiz, A. Cosio, Y. Wu, D. Villagran, Kinjal Gandha, C. Karthik, I. C. Nlebedim, S. R. Singamaneni 2018 University of Texas at El Paso

Magnetic And Electrocatalytic Properties Of Transition Metal Doped Mos2 Nanocrystals, L. M. Martinez, J. A. Delgado, C. L. Saiz, A. Cosio, Y. Wu, D. Villagran, Kinjal Gandha, C. Karthik, I. C. Nlebedim, S. R. Singamaneni

Ames Laboratory Accepted Manuscripts

In this paper, the magnetic and electrocatalytic properties of hydrothermally grown transition metal doped (10% of Co, Ni, Fe, and Mn) 2H-MoS2 nanocrystals (NCs) with a particle size 25–30 nm are reported. The pristine 2H-MoS2 NCs showed a mixture of canted anti-ferromagnetic and ferromagnetic behavior. While Co, Ni, and Fe doped MoS2 NCs revealed room temperature ferromagnetism, Mn doped MoS2 NCs showed room temperature paramagnetism, predominantly. The ground state of all the materials is found to be canted-antiferromagnetic phase. To study electrocatalytic performance for hydrogen evolution reaction, polarization curves were measured for undoped and the doped MoS2 NCs. At ...


Reverse-Engineering Of Graphene On Metal Surfaces: A Case Study Of Embedded Ruthenium, Ann Lii-Rosales, Yong Han, Ka Man Yu, Dapeng Jing, Nathaniel Anderson, David Vaknin, Michael C. Tringides, James W. Evans, Michael S. Altman, Patricia A. Thiel 2018 Iowa State University and Ames Laboratory

Reverse-Engineering Of Graphene On Metal Surfaces: A Case Study Of Embedded Ruthenium, Ann Lii-Rosales, Yong Han, Ka Man Yu, Dapeng Jing, Nathaniel Anderson, David Vaknin, Michael C. Tringides, James W. Evans, Michael S. Altman, Patricia A. Thiel

Chemistry Publications

Using scanning tunneling microscopy, x-ray photoelectron spectroscopy, and x-ray absorption spectroscopy, we show that Ru forms metallic nanoislands on graphite, covered by a graphene monolayer. These islands are air-stable, contain 2–4 layers of Ru, and have diameters on the order of 10 nm. To produce these nanoislands two conditions must be met during synthesis. The graphite surface must be ion-bombarded, and subsequently held at an elevated temperature (1000–1180 K) during Ru deposition. A coincidence lattice forms between the graphene overlayer and the Ru island top. Its characteristics—coincidence lattice constant, corrugation amplitude, and variation of carbon lattice appearance ...


Magnetoelectric Memory Cells With Domain-Wall-Mediated Switching, Kirill Belashchenko, Oleg Tchernyshyov, Alexey Kovalev, Dmitri Nikonov 2018 University of Nebraska - Lincoln

Magnetoelectric Memory Cells With Domain-Wall-Mediated Switching, Kirill Belashchenko, Oleg Tchernyshyov, Alexey Kovalev, Dmitri Nikonov

Kirill Belashchenko Publications

A magnetoelectric memory cell with domain - wall - mediated switching is implemented using a split gate architecture . The split gate architecture allows a domain wall to be trapped within a magnetoelectric antiferromagnetic ( MEAF ) active layer . An extension of this architecture applies to multiple gate linear arrays that can offer advantages in memory density , programmability , and logic functionality . Applying a small anisotropic in - plane shear strain to the MEAF can block domain wall precession to improve reliability and speed of switching


Solar Efficiency Index Of Building Envelopes And Load Matching In Low Energy Buildings, Ellika Taveres-Cachat, Francesco Goia, Steinar Grynning 2018 NTNU

Solar Efficiency Index Of Building Envelopes And Load Matching In Low Energy Buildings, Ellika Taveres-Cachat, Francesco Goia, Steinar Grynning

International Building Physics Conference

Net-zero energy buildings oftentimes rely on solar-based building integrated technologies to offset energy use and achieve their goals. However, the value of a particular system is difficult to assess given that these technologies often bring about complex interactions with the indoor environment, and building energy management systems. The approach chosen in this study was to propose and test a simple index called the Solar Efficiency index (SE index), which makes it possible to characterize the performance of building envelopes with integrated solar systems. The index was used to investigate the effect of different configurations of a PV integrated shading device ...


Field Experimental Investigation Of Temperature, Humidity And Solar Radiation Impacts On Formaldehyde Emission From Interior Furnishing Material (Particle Board): A Preliminary Study, Alula Yadete, Fitsum Tariku, Doug Horn 2018 British Colombia Institute of Technology (BCIT)

Field Experimental Investigation Of Temperature, Humidity And Solar Radiation Impacts On Formaldehyde Emission From Interior Furnishing Material (Particle Board): A Preliminary Study, Alula Yadete, Fitsum Tariku, Doug Horn

International Building Physics Conference

Some part of indoor space components such as furniture and surfaces (like walls and floor carpet) contains contaminants and emit them over time. The emission is affected by different environmental factors like temperature, relative humidity, and solar radiation. As a result, three field experiments are conducted to assess the impact of these environmental factors on Formaldehyde emission. This study referred to previous literature on measuring volatile compound emission from wood stain using balance scale. Consequently, a similar test setup (balance scale) is adopted to investigate formaldehyde emission from test sample which is exposed to solar radiation in fully controlled test ...


Effect Of Economic Indicators On Cost-Optimal Energy Performance Levels Of Residential Buildings Retrofits In The Mediterranean Region Of Turkey, Neşe Ganiç Sağlam, Zerrin A. Yılmaz, Stefano P. Corgnati 2018 Ozyegin University

Effect Of Economic Indicators On Cost-Optimal Energy Performance Levels Of Residential Buildings Retrofits In The Mediterranean Region Of Turkey, Neşe Ganiç Sağlam, Zerrin A. Yılmaz, Stefano P. Corgnati

International Building Physics Conference

This study aims to analyse the effect of economic indicators on cost-optimal levels of residential building retrofits in Mediterranean region of Turkey. Sensitivity analyses were applied on the cost-optimality calculation results for the residential reference building. The sensitivity analyses address discount rate and potential investment cost decreases. Results reveal that 6% variation in the discount rate corresponds to more than 30 kWh/m2y difference in the primary energy consumption of the cost-optimal solutions. Potential investment cost decreases for certain retrofit measures are also effective on identified cost-optimal levels and subsidy opportunities appear as an effective tool to achieve higher energy ...


On The Compliance Of Thermal Performance Requirements For Highly Insulated Building Units, Giovanni Murano, Ilaria Ballarini, Giovanna De Luca, Domenico Dirutigliano, Elisa Primo, Vincenzo Corrado 2018 Politecnico di Torino

On The Compliance Of Thermal Performance Requirements For Highly Insulated Building Units, Giovanni Murano, Ilaria Ballarini, Giovanna De Luca, Domenico Dirutigliano, Elisa Primo, Vincenzo Corrado

International Building Physics Conference

The target of the nearly zero-energy building (nZEB), stated by the European Union, represents one of the most strenuous challenges to reduce energy consumptions and greenhouse gas emissions in the building sector. In Italy, the nZEB concept refers to a set of energy performance requirements, fixed at national level and establishing a maximum allowable mean thermal transmittance value of the building envelope, as a function of the heating degree-days and of the shape factor. The building envelope is becoming more and more thermally insulated; this determines the reduction of the energy need for heating, but on the other hand it ...


Thermal Performance Of Pcm-Glazing Unit Under Moderate Climatic Conditions, Anna Wieprzkowicz, Dariusz Heim 2018 Lodz University of Technology

Thermal Performance Of Pcm-Glazing Unit Under Moderate Climatic Conditions, Anna Wieprzkowicz, Dariusz Heim

International Building Physics Conference

Considering physical properties, transparent or translucent building components like windows or glazing facades are the weakest elements of building envelope. The heat transfer coefficient of such elements is approximately four times higher than for opaque partitions, which causes considerable increase of heat loss during winter. In summer relatively high solar transmittance is a source of heat gains which results in undesirable overheating. Application of phase change materials in glazing components affects its thermal performance by the increase of its heat capacity and decrease of solar heat gains, with regard to the current physical state of the PCM. The aim of ...


Experimental Study On The Impact Of Passive Chilled Beam In A Room With Displacement Ventilation, Zhu Shi, Vishal Anand, Qingyan Chen 2018 Purdue University

Experimental Study On The Impact Of Passive Chilled Beam In A Room With Displacement Ventilation, Zhu Shi, Vishal Anand, Qingyan Chen

International Building Physics Conference

Previous studies have demonstrated that displacement ventilation (DV) can provide better air quality than mixing ventilation (MV), and may save energy in buildings. However, since DV introduces supply air to the occupied zone directly, the temperature of supply air it provides is normally higher than in a MV system, so the ability to remove cooling load is limited with the same amount of air. On the other hand, passive chilled beam (PCB) systems have been shown to be able to remove a large cooling load while saving energy. Therefore, this research studied a coupled configuration that combined DV and PCB ...


Visual Comfort Assessment Of Different Shading Strategies In A Commercial Office Building In The Southeastern Us, Armin Amirazar, Mona Azarbayjani, Ben Futrell, Amir Hosseinzadeh Zarrabi, Roshanak Ashrafi 2018 University of North Carolina at Charlotte

Visual Comfort Assessment Of Different Shading Strategies In A Commercial Office Building In The Southeastern Us, Armin Amirazar, Mona Azarbayjani, Ben Futrell, Amir Hosseinzadeh Zarrabi, Roshanak Ashrafi

International Building Physics Conference

It is challenging to design buildings that simultaneously consider both the dynamic nature of daylight and specific occupant preferences. The authors have investigated this problem by studying the performance of four specific shading strategies using quantitative measurements of occupants visual comfort: discomfort glare and daylight availability. This paper specifically evaluates the performance of four shading strategies, two types of electrochromic (EC) glass, an automated fabric roller shade, and a venetian blind in a building located in the Southeastern United States. This paper examines how these technologies impact occupant visual comfort and it also examines how the buildings perform relative to ...


Study On Improving The Surface Wet Condition Of Subfloor By Hygroscopic Material In Rural Residences Of China, Jinzhong Fang, Mingfang Tang, Lin Jiang, Dongfang Lai 2018 Chongqing University

Study On Improving The Surface Wet Condition Of Subfloor By Hygroscopic Material In Rural Residences Of China, Jinzhong Fang, Mingfang Tang, Lin Jiang, Dongfang Lai

International Building Physics Conference

Microporous surface materials are put forward to prevent condensation on subfloor in some building design standards and specifications in China. However, in the current study there are mostly applied cases, lacking of quantitative research. This paper simulated and compared the surface wet condition of three different surface materials by WUFI software: solid brick, hardwood and glazed tile brick. The results shows that the time on surface relative humidity that above 95%, hygroscopic subfloor reduces by more than 20% over non-hygroscopic subfloor, and the improvement is over 45% in relative humidity range of 99% to 100%. In high-humidity areas such as ...


The Effect Of Ambient Moisture Conditions On Heat Flux Time Shift And Decrement Factor Of Multi-Layered Walls, Nadja Bishara, Andrea Gasparella 2018 Free University of Bozen; KREBS+KIEFER Ingenieure GmbH

The Effect Of Ambient Moisture Conditions On Heat Flux Time Shift And Decrement Factor Of Multi-Layered Walls, Nadja Bishara, Andrea Gasparella

International Building Physics Conference

Thermal properties of the opaque building envelope components are crucial for limiting the energy needs of a building. In particular, dynamic thermal properties of envelope components can significantly contribute to the minimization of heat transfer through the envelope and to the appropriate utilization of the internal and solar gains. This is particularly important in the cooling operation, especially in hot climates. Previous experimental and numerical studies on the determination of dynamic thermal parameters of opaque building components neglected the influence of moisture conditions prevailing within the ambient climate. This paper utilizes a calibrated and validated dynamic heat and mass transfer ...


Power Generation And Visual Comfort Performance Of Photovoltaic Toplighting Technologies In Transient Spaces, Nick Novelli, Brandon Andow, Scott Overall, Mohamed Aly, Christopher Morse, Berardo Matalucci 2018 HeliOptix LLC

Power Generation And Visual Comfort Performance Of Photovoltaic Toplighting Technologies In Transient Spaces, Nick Novelli, Brandon Andow, Scott Overall, Mohamed Aly, Christopher Morse, Berardo Matalucci

International Building Physics Conference

Advances in long-span glazed structures and interest in high-performance building design has proliferated semi-conditioned spaces with large areas of overhead glazing. These spaces are often programmed with intermittent occupation where variability of the indoor climate is an intentional factor of the experience. Technological options for glazed canopy structures have likewise evolved, gaining functions such as power generation which diversifies the benefits of overhead glazing beyond weather protection and daylighting. Here we model the multiple benefits of current and emerging toplighting technologies deployed in the overhead glazing of a train station and compare power generation and visual comfort. A common building ...


Application Of C-Svm Classification Algorithm To The Lighting Visual Comfort Of University Classrooms, Rui Dang, Qingchen Wang, Yanhui Bu, Gang Liu 2018 Tianjin University

Application Of C-Svm Classification Algorithm To The Lighting Visual Comfort Of University Classrooms, Rui Dang, Qingchen Wang, Yanhui Bu, Gang Liu

International Building Physics Conference

Considering the quality of the classroom light-environment will directly affect students' eye health and learning efficiency, it is a problem to be solved that how to evaluate the visual comfort levels of the classroom light-environment and save lighting energy on the premise of necessary visual comfort. Aiming at these problems above, this study restored the classroom scene through adjustable full-size light-environment simulation laboratory, in which 135 subjects participated in the visual comfort evaluation experiment of the indoor light-environment. After features (illuminance and correlated color temperature) and labels (comfort levels) preprocessed ,we trained and visualized the visual comfort classification models of ...


Environmental Conditions And Occupant Satisfaction In The Workplace: A Controlled Study In A Living Lab, Jennifer Nguyen, Stephanie Huynh, Anja Jamrozik, Nicholas Clements, Christian Ramos, Brent Bauer, Jie Zhao 2018 Delos Living LLC

Environmental Conditions And Occupant Satisfaction In The Workplace: A Controlled Study In A Living Lab, Jennifer Nguyen, Stephanie Huynh, Anja Jamrozik, Nicholas Clements, Christian Ramos, Brent Bauer, Jie Zhao

International Building Physics Conference

Living labs offer a powerful, new way to measure human-building interactions. In addition to having the advantages of a traditional controlled laboratory setting, living labs facilitate the study of how combinations of environmental factors directly affect human health and satisfaction in a real-world setting. The aim of this experimental study was to characterize the relationship between individual-level exposure to environmental conditions and reported satisfaction with environmental quality in a simulated open-office workspace created in a living lab. Eight office workers were exposed to six different week-long combinations of light (natural and electric), sound, and thermal conditions over 18 weeks in ...


Digital Commons powered by bepress