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Articles 21901 - 21930 of 27416

Full-Text Articles in Engineering

Short Surface Relief Fabry-Perot Fiber Bragg Gratings For Improved Strain Sensing, Andrew Sieler, Dr. Stephen Schultz Aug 2013

Short Surface Relief Fabry-Perot Fiber Bragg Gratings For Improved Strain Sensing, Andrew Sieler, Dr. Stephen Schultz

Journal of Undergraduate Research

The use of optical fiber as a sensing instrument has become an important application in the optics field. Due to previous research conducted here at BYU1 it is now possible to fabricate Surface Relief Fiber Bragg Gratings, SR-FBGs, which can be used as a temperature or strain sensing instrument. This sensor is lightweight and immune to electromagnetic interference because of the inherent attributes associated with optical fiber. The type of FBG I wish to research, the FP-FBG, will be much more sensitive than a standard SR-FBG. Another quality of optical sensors is the fact that they are so compact they …

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High-Speed Full-Spectrum Interrogation Of Fiber Bragg Gratings For Composite Impact Sensing, Spencer Chadderdon, Dr. Richard Selfridge Aug 2013

High-Speed Full-Spectrum Interrogation Of Fiber Bragg Gratings For Composite Impact Sensing, Spencer Chadderdon, Dr. Richard Selfridge

Journal of Undergraduate Research

Fiber Bragg gratings (FBG) sensors are useful for static and dynamic event monitoring which make then suitable for a wide variety of applications. Dynamic interrogation of FBG sensors has primarily been performed using peak-tracking methods that have repetition rates approaching the megahertz range. However, tracking the variations in the peak response of a FBG sensor reflection spectrum can result in inaccurate measurements. For example, when under the influence of vibrations, acoustical noise, and transverse strains FBG sensor spectra associated with impact and vibrations not only have peak shifts, but the reflection spectrum can exhibit dramatic spreading or even peak splitting.

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Thermal Protection For Extreme Labor, Christopher Hanks, Dave Morgan Aug 2013

Thermal Protection For Extreme Labor, Christopher Hanks, Dave Morgan

Journal of Undergraduate Research

Many people died when temperatures rose to 115°F in Southeastern Europe in July of 2000(Blumberg). The Sahara Desert exceeds 120°F, creating a nearly inhospitable environment. The temperature off of the Phoenix Airport runway was reported at 150°F the summer of 2009. This very same environment is the workplace of ramp agents who lift and load heavy luggage into passenger in, and day out. Through researching methods of heat transfer, and interviewing workers, I have conceptualized a number of cooling solutions which will protect workers from the heat.

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Miniature Linear Ion Trap Fabrication, Hannah Quist, Dr. Aaron Hawkins Aug 2013

Miniature Linear Ion Trap Fabrication, Hannah Quist, Dr. Aaron Hawkins

Journal of Undergraduate Research

Ion trapping is a method of determining the elemental composition of a charged sample, allowing the substance to be properly identified. It uses metal rings or lines with an applied voltage and radio frequency to initially trap the ions in a central region and begin to eject successively larger ions as the radio frequency is increased.

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Development/Ballistics Testing Of Lightweight Sandwich-Composite Body Armor, Brian Spencer, Dr. Anton Bowden Aug 2013

Development/Ballistics Testing Of Lightweight Sandwich-Composite Body Armor, Brian Spencer, Dr. Anton Bowden

Journal of Undergraduate Research

Body armor is one of the most important tools used in the protection of soldiers and other armed forces around the world. Although the current style of armor, using Kevlar fiber and ceramic inserts, is generally effective, it is bulky and heavy and can cause overheating and lack of mobility. Our research attempts to remedy these issues by using shear-thickening fluid (STF) impregnated Kevlar XP combined with corrugated plastic to create and test lighter, more effective body armor.

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Critical Component Selection For Implementing Barriers To Reverse Engineering, Shane K. Curtis, Dr. Christopher Mattson Aug 2013

Critical Component Selection For Implementing Barriers To Reverse Engineering, Shane K. Curtis, Dr. Christopher Mattson

Journal of Undergraduate Research

Reverse engineering is a prominent design strategy in industry, employed by many to uncover the enabling technologies of innovative products. Unfortunately, there is little motivation for original designers to create new products if competitors can reverse engineer these products and reproduce them at a lower development cost. One solution to this problem involves the incorporation of barriers to reverse engineering into products during the design process. These barriers not only increase the cost of reverse engineering but can also improve product performance with only a small increase in manufacturing or development time.

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Peru Wind Turbine: Electrical, Devin Athey, Dr. Randy Lewis Aug 2013

Peru Wind Turbine: Electrical, Devin Athey, Dr. Randy Lewis

Journal of Undergraduate Research

This project focused on the design of electrical components for a low-cost, low-speed wind turbine in Peru. The electrical components include the charge controller and the three-phase AC rectifier. These parts, if purchased from retailers, cost $100 and $30 USD respectively. The wind turbine was proposed for low-income residents of villages that are not located near power grids. The focus village was located on Lake Titicaca, Peru. Each family in this village has a monthly income of just under $30 USD. Their current source of electricity comes from solar panels that cost upwards of $1200 USD. In order for a …

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Establishment Of Life Reduction Factors For Microsurfacing, Bryan Wilson, Dr. W Spencer Guthrie Aug 2013

Establishment Of Life Reduction Factors For Microsurfacing, Bryan Wilson, Dr. W Spencer Guthrie

Journal of Undergraduate Research

Since the majority of the pavement network in the United States is already constructed1, most of the attention has turned toward maintaining and reconstructing existing roads. Through routine maintenance of the wearing surface, the life of a pavement is greatly extended and long-term costs greatly reduced. Pavement maintenance treatments range from quick and inexpensive crack-sealing to more intensive surface milling followed by a costly asphalt overlay. One treatment recently put to mainstream use in Utah is microsurfacing. Microsurfacing is often described as the most durable and stable of the available slurry seals. Like other slurries it protects against water ingress, …

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Multi-Axial Fiber-Optic Electric Field Sensor, Daniel Perry, Dr. Stephen Schultz Aug 2013

Multi-Axial Fiber-Optic Electric Field Sensor, Daniel Perry, Dr. Stephen Schultz

Journal of Undergraduate Research

High powered microwave weapons use electric fields to overload electronics. We developed a non-intrusive sensor using a technology based on slab coupled optical sensing (SCOS). Each sensor detects the electric field component normal to the surface of the slab. By mounting two of these sensors orthogonally to each other, a more complete image of the electrical field can be obtained. One of the major hurdles of creating a multi-axial SCOS is keeping the size of the sensor small. The size is limited by (1) the size of the sensing material and (2) the ability to package the sensor to maintain …

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The Effect Zeolite Addition In Natural Rubber Polypropylene Composite On Mechanical, Structure, And Thermal Characteristics, Nurdin Bukit, Erna Frida Aug 2013

The Effect Zeolite Addition In Natural Rubber Polypropylene Composite On Mechanical, Structure, And Thermal Characteristics, Nurdin Bukit, Erna Frida

Makara Journal of Technology

This study was conducted to determine the effect of zeolite as filler on mechanical properties, and thermal structure blends of natural rubber and polypropylene (NR/PP). In this study, NR/PP/PP-g-MA blends was filled uncalcined zeolite and calcined zeolite at different weight percent of the 2, 4, and 6%. Samples were characterized to determine the tensile strength, fracture elongation and Young's modulus. Structure of the samples was investigated using XRD method and thermal characteristics were analyzed using DTA/TGA technique. The results obtained for tensile strength showed a significant influence with the addition zeolite of the NR/PP blends at 2% by weight of …

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Characteristics Of Vacuum Freeze Drying With Utilization Of Internal Cooling And Condenser Waste Heat For Sublimation, Muhammad Idrus Alhamid, Nasruddin Yusuf, Indra Teuku Meurah Mahlia, Engkos Ahmad Kosasih, Muhamad Yulianto, Rio Ricardi Aug 2013

Characteristics Of Vacuum Freeze Drying With Utilization Of Internal Cooling And Condenser Waste Heat For Sublimation, Muhammad Idrus Alhamid, Nasruddin Yusuf, Indra Teuku Meurah Mahlia, Engkos Ahmad Kosasih, Muhamad Yulianto, Rio Ricardi

Makara Journal of Technology

Vacuum freeze drying is an excellent drying method, but it is very energy-intensive because a relatively long drying time is required. This research investigates the utilization of condenser waste heat for sublimation as a way of accelerating the drying rate. In addition, it also investigates the effect of internal cooling combined with vacuum cooling in the pressure reduction process. Jelly fish tentacles were used as the specimen, with different configurations for condenser heat waste and internal cooling valve opening. The results show that heating with condenser heat waste can accelerate the drying rate up to 0.0035 kg/m2.s. In addition, pre-freezing …

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A New Experimental Approach To Evaluate Plasma-Induced Damage In Microcantilever, Yuki Nishimori, Shinji Ueki, Masakazu Sugiyama, Seiji Samukawa, Gen Hashiguchi Aug 2013

A New Experimental Approach To Evaluate Plasma-Induced Damage In Microcantilever, Yuki Nishimori, Shinji Ueki, Masakazu Sugiyama, Seiji Samukawa, Gen Hashiguchi

Makara Journal of Technology

Plasma etching, during micro-fabrication processing is indispensable for fabricating MEMS structures. During the plasma processes, two major matters, charged ions and vacuum–ultraviolet (VUV) irradiation damage, take charge of reliability degradation. The charged ions induce unwanted sidewall etching, generally called as “notching”, which causes degradation in brittle strength. Furthermore, the VUV irradiation gives rise to crystal defects on the etching surface. To overcome the problem, neutral beam etching (NBE), which use neutral particles without the VUV irradiation, has been developed. In order to evaluate the effect of the NBE quantitatively, we measured the resonance property of a micro-cantilever before and after …

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Fatigue Life Prediction Of The Keel Structure Of A Tsunami Buoy Using Spectral Fatigue Analysis Method, Angga Yustiawan, Ketut Suastika, Wibowo Harso Nugroho Aug 2013

Fatigue Life Prediction Of The Keel Structure Of A Tsunami Buoy Using Spectral Fatigue Analysis Method, Angga Yustiawan, Ketut Suastika, Wibowo Harso Nugroho

Makara Journal of Technology

One of the components of the Indonesia Tsunami Early Warning System (InaTEWS) is a surface buoy. The surface buoy is exposed to dynamic and random loadings while operating at sea, particularly due to waves. Because of the cyclic nature of the wave load, this may result in a fatigue damage of the keel structure, which connects the mooring line with the buoy hull. The operating location of the buoy is off the Java South Coast at the coordinate (10.3998 S, 108.3417 E). To determine the stress transfer function, model tests were performed, measuring the buoy motions and the stress at …

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The Plasma Electrolysis Phenomenon In A Two-Compartment Reactor For Chlor-Alkali Production, Nelson Saksono, Fakhrian Abqari, Setijo Bismo Aug 2013

The Plasma Electrolysis Phenomenon In A Two-Compartment Reactor For Chlor-Alkali Production, Nelson Saksono, Fakhrian Abqari, Setijo Bismo

Makara Journal of Technology

Chlor-alkali is one of the most important processes in the chemical industry. It produces chlorine and caustic soda, which become the main feedstock of daily products. The aim of this study is to report the phenomenon of plasma electrolysis and how it can be used in chlor-alkali production for more efficient energy consumption. When the plasma is formed, the current fluctuates and gradually declines. Plasma electrolysis begins with the process of electrolysis itself. Due to Joule heating, gas bubbles are formed and a sheath is made on both electrodes, resulting in the plasma field. Plasma electrolysis can be identified by …

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Observation Of Photovoltaic Effect And Single-Photon Detection In Nanowire Silicon Pn-Junction, Arief Udhiarto, Sri Purwiyanti, Daniel Moraru, Takeshi Mizuno, Michiharu Tabe Aug 2013

Observation Of Photovoltaic Effect And Single-Photon Detection In Nanowire Silicon Pn-Junction, Arief Udhiarto, Sri Purwiyanti, Daniel Moraru, Takeshi Mizuno, Michiharu Tabe

Makara Journal of Technology

We study nanowire silicon pin and pn-junctions at room and low temperature. Photovoltaic effects are observed for both devices at room temperature. At low temperature, nanowire pn-junction devices show their ability to detect single photon. This ability was not been observed for pin devices. Phosphorus-boron dopant cluster in the depletion region is considered to have the main role for single-photon detection capability. Fundamental mechanism of dopant-based single-photon detection in nanowire pn-junction is described in details.

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Influences Of Surface Morphology Of Nanostructured Rutile Tio2 Nanorods/Nanoflowers As Photoelectrode On The Performance Of Dye-Sensitized Solar Cell, Mohd Khairul Bin Ahmad, Kenji Murakami Aug 2013

Influences Of Surface Morphology Of Nanostructured Rutile Tio2 Nanorods/Nanoflowers As Photoelectrode On The Performance Of Dye-Sensitized Solar Cell, Mohd Khairul Bin Ahmad, Kenji Murakami

Makara Journal of Technology

Aligned Rutile TiO2 nanorods (r-TNRs) and TiO2 nanoflowers (r-TNFs) were successfully prepared by hydrothermal method. Using hydrochloric acid (HCl) as chelating agent and titanium butoxide (TBOT) as precursor, aligned r-TNRs with r-TNFs were successfully growth onto fluorine-doped tin oxide (FTO) with different morphologies. The influences of surface morphologies to the rutile based Dye-sensitized solar cell (DSC) efficiency are discussed. The highest lightto- electric energy conversion efficiency, 1.80% is achieved using different concentration under simulated solar light illumination of 100 mWcm-2 (1.5 AM).

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Improvement In Performance Of Zno Based Dsc Prepared By Spraying Method, Rangga Winantyo, Devinda Liyanage, Kenji Murakami Aug 2013

Improvement In Performance Of Zno Based Dsc Prepared By Spraying Method, Rangga Winantyo, Devinda Liyanage, Kenji Murakami

Makara Journal of Technology

This paper reports the effect of TiCl4 on the performance of ZnO based DSC. ZnO was used due to its stability against photo-corrosion and photochemical properties similar to TiO2. Thin films of nanocrystalline ZnO were deposited on transparent conducting oxide glass using spray method. The ZnO films were treated using TiCl4. The cell’s efficiency was found to be 2.5% with TiCl4 post-treatment and 1.9% without TiCl4 post-treatment.

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Determining The Air Gap Length Of An Axial Flux Wound Rotor Synchronous Generator, Abdul Multi, Iwa Garniwa, Uno Bintang Sudibyo Aug 2013

Determining The Air Gap Length Of An Axial Flux Wound Rotor Synchronous Generator, Abdul Multi, Iwa Garniwa, Uno Bintang Sudibyo

Makara Journal of Technology

The air gap length of the designed axial flux wound rotor (AFWR) synchronous generator is determined properly according to the design parameters. One of the distinct advantages of an axial flux (AF) machine is its adjustable air gap. An AF generator’s performance might be controlled by adjusting its air gap. The designed generator has a smallscale capacity that has 1 kW, 380 V, and 50 Hz. The windings are laid into slots made from laminated core. The slots are carved in the face of the stator and rotors. The generator has a single-double-sided slotted wound stator sandwiched between twin rotors. …

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Production Optimization For Plan Of Gas Field Development Using Marginal Cost Analysis, Suprapto Soemardan, Widodo Wahyu Purwanto, Arsegianto Arsegianto Aug 2013

Production Optimization For Plan Of Gas Field Development Using Marginal Cost Analysis, Suprapto Soemardan, Widodo Wahyu Purwanto, Arsegianto Arsegianto

Makara Journal of Technology

Gas production rate is one of the most important variables affecting the feasibility plan of gas field development. It take into account reservoir characteristics, gas reserves, number of wells, production facilities, government take and market conditions. In this research, a mathematical model of gas production optimization has been developed using marginal cost analysis in determining the optimum gas production rate for economic profit, by employing the case study of Matindok Field. The results show that the optimum gas production rate is mainly affected by gas price duration and time of gas delivery. When the price of gas increases, the optimum …

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Scitech Book News Reviews, Susan Fingerman Aug 2013

Scitech Book News Reviews, Susan Fingerman

Sci-Tech News

No abstract provided.

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A Methodology For Designing Airports For Enhanced Security Using Simulation, Oliver Nwofia, Christopher A. Chung Jul 2013

A Methodology For Designing Airports For Enhanced Security Using Simulation, Oliver Nwofia, Christopher A. Chung

Journal of Aviation Technology and Engineering

With the advent of the new security measures, today’s airports have become increasingly complex and congested. Air and passenger traffic continues to increase; consequently, the need for intelligent design concepts is required. Unlike all other existing airport designs that focused exclusively on operational performance, this study focused on the development of a new airport terminal design methodology that takes a proactive approach to minimizing the effects of security disruptions while simultaneously maximizing operational performance and passenger flow. The study addressed the impact of security operations on both the design of airport facilities and passenger flows, and discussed options and scenarios …

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55th Annual Rocky Mountain Conference On Magnetic Resonance Jul 2013

55th Annual Rocky Mountain Conference On Magnetic Resonance

Rocky Mountain Conference on Magnetic Resonance

Final program, abstracts, and information about the 55th annual meeting of the Rocky Mountain Conference on Magnetic Resonance, co-endorsed by the Colorado Section of the American Chemical Society and the Society for Applied Spectroscopy. Held in Denver, Colorado, July 28 - August 1, 2013.

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Computer Vision Based, Non-Contacting Deformation And Shape Measurements: A Revolution In Progress, Michael A. Sutton Jul 2013

Computer Vision Based, Non-Contacting Deformation And Shape Measurements: A Revolution In Progress, Michael A. Sutton

Journal of the South Carolina Academy of Science

The rapid expansion of computer technology in the past thirty years has impacted society in innumerable ways. Of interest for this discussion is the breath-taking change in measurement sciences that has occurred as the digital age dawned and has now become part of our daily lives. In particular, the effect on image-based, non-contacting measurements will be described and the continuing revolutionary impact that the resulting technology has engendered will be reviewed. Additionally, the unprecedented expansion of capabilities will be highlighted by presenting a set of illustrative example studies.

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Engineering Design Research: Successful Integration Of Education, Practice, And Study In The Cedar Group, Joshua D. Summers Jul 2013

Engineering Design Research: Successful Integration Of Education, Practice, And Study In The Cedar Group, Joshua D. Summers

Journal of the South Carolina Academy of Science

Engineering design is a generally nascent area of research within the engineering disciplines, spanning only a few decades of critical investigation. Clemson University has been at the forefront of the development of this field and continues this with a living experiment in how to integrate education, practice, and research through the CEDAR group. This essay introduces the reader to design research and the areas of study within CEDAR. Following this, an analysis of the research trends exposes three pillars of CEDAR philosophy: helping others, seeking variety, and learning from others. The goal of this essay is to introduce the wider …

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บทบรรณาธิการ, ประมวล สุธีจารุวัฒน Jul 2013

บทบรรณาธิการ, ประมวล สุธีจารุวัฒน

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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การวิเคราะห์เชิงลึกอุตสาหกรรมอู่ต่อเรือซ่อมเรือที่เกี่ยวข้องกับอุตสาหกรรมเรือประมงไทย Jul 2013

การวิเคราะห์เชิงลึกอุตสาหกรรมอู่ต่อเรือซ่อมเรือที่เกี่ยวข้องกับอุตสาหกรรมเรือประมงไทย

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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โครงการพัฒนาฐานข้อมูลเชิงลึกอุตสาหกรรมต่อเรือ, ประมวล สุธีจารุวัฒน, วันชัย มีชาติ, พิษณุ คนองชัยยศ, สุภารัตน์ ตันทนงศักดิ์กุล, วิษารัช สัญญาลักษณ์ฤาชัย Jul 2013

โครงการพัฒนาฐานข้อมูลเชิงลึกอุตสาหกรรมต่อเรือ, ประมวล สุธีจารุวัฒน, วันชัย มีชาติ, พิษณุ คนองชัยยศ, สุภารัตน์ ตันทนงศักดิ์กุล, วิษารัช สัญญาลักษณ์ฤาชัย

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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โครงการพัฒนาฐานข้อมูลอุตสาหกรรมเชิงเปรียบเทียบเพื่อเพิ่มขีดความสามารถในการแข่งขันของอุตสาหกรรมไทยสาขาอุตสาหกรรมต่อเรือและซ่อมเรือ, ประมวล สุธีจารุวัฒน, สุมาลี สุขดานนท์, สุนันทา เจริญปัญญายิ่ง, สมศักดิ์ สุคนธมาน Jul 2013

โครงการพัฒนาฐานข้อมูลอุตสาหกรรมเชิงเปรียบเทียบเพื่อเพิ่มขีดความสามารถในการแข่งขันของอุตสาหกรรมไทยสาขาอุตสาหกรรมต่อเรือและซ่อมเรือ, ประมวล สุธีจารุวัฒน, สุมาลี สุขดานนท์, สุนันทา เจริญปัญญายิ่ง, สมศักดิ์ สุคนธมาน

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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ภาวะอุสาหกรรมการต่อเรือไทย : ทิศทาง แนวโน้มและข้อเสนอเชิงนโยบาย Jul 2013

ภาวะอุสาหกรรมการต่อเรือไทย : ทิศทาง แนวโน้มและข้อเสนอเชิงนโยบาย

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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โครงการพัฒนาศูนย์วิเคราะห์ข้อมูลเชิงลึกอุตสาหกรรมอู่ต่อเรือ, ประมวล สุธีจารุวัฒน, วันชัย มีชาติ, พิษณุ คนองชัยยศ, สุภารัตน์ ตันทนงศักดิ์กุล, วิษารัช สัญญาลักษณ์ฤาชัย Jul 2013

โครงการพัฒนาศูนย์วิเคราะห์ข้อมูลเชิงลึกอุตสาหกรรมอู่ต่อเรือ, ประมวล สุธีจารุวัฒน, วันชัย มีชาติ, พิษณุ คนองชัยยศ, สุภารัตน์ ตันทนงศักดิ์กุล, วิษารัช สัญญาลักษณ์ฤาชัย

Journal of Transportation and Logistics (TRANSLOG)

No abstract provided.

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