Authors From All Over The World Share Their Tech In Hardwarex To Battle Covid-19,
2021
Michigan Technological University
Authors From All Over The World Share Their Tech In Hardwarex To Battle Covid-19, Joshua M. Pearce
Michigan Tech Publications, Part 1
No abstract provided.
Experimental Study Of Hollow-Core Slab Containing Waste Pet Bottles,
2021
Civil Engineering Department, Faculty of Engineering, Universitas Indonesia, Depok 16424, Indonesia
Experimental Study Of Hollow-Core Slab Containing Waste Pet Bottles, Mulia Orientilize, Josia Irwan Rastandi, R. M. Dimas Aries C., Marsha Niken P., Krisna Adi S.S., Abimantrana Abimantrana
Makara Journal of Technology
This study investigated the utilization of plastic-waste concrete as an effort to reduce urban waste problems. The waste plastic bottles were utilized to form the hollows of the hollow-core slabs (HCSs). The bottles were made of polyethylene terephthalate (PET). As a part of green research to reuse waste material, shredded PET was also added to the concrete mixture to improve the HCS strength. The cast-in-site HCS could be constructed without any difficulties. Three parameters were investigated: the effects of void content, shredded PET content, and steel-fiber (SF) content on the HCS ultimate bending capacity (Mu). Fifteen specimens were tested under …
Signatures Of Vibrational And Electronic Quantum Beats In Femtosecond Coherence Spectra,
2021
California State University, Chico
Signatures Of Vibrational And Electronic Quantum Beats In Femtosecond Coherence Spectra, Paul C. Arpin, Daniel B. Turner
Materials Science and Engineering Faculty Publications and Presentations
Femtosecond laser pulses can produce oscillatory signals in transient-absorption spectroscopy measurements. The quantum beats are often studied using femtosecond coherence spectra (FCS), the Fourier domain amplitude, and phase profiles at individual oscillation frequencies. In principle, one can identify the mechanism that gives rise to each quantum-beat signal by comparing its measured FCS to those arising from microscopic models. To date, however, most measured FCS deviate from the ubiquitous harmonic oscillator model. Here, we expand the inventory of models to which the measured spectra can be compared. We develop quantum-mechanical models of the fundamental, overtone, and combination-band FCS arising from harmonic …
The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement,
2021
Delft University of Technology
The Role Of Rejuvenators In Embedded Damage Healing For Asphalt Pavement, Shi Xu, Xueyan Liu, Amir Tabakovic, P Lin, Y Zhang, S Nahar, B J. Lommerts, Erik Schlangen
Articles
Rejuvenator encapsulation technique showed great potential for extrinsic asphalt pavement damage healing. Once the capsules are embedded within asphalt pavement, the healing is activated on-demand via progressing microcrack. When the microcrack encounters the capsule, the fracture energy at the tip opens the capsule and releases the rejuvenator. Then the released rejuvenator wets the crack surfaces, diffuses into and softens the aged bitumen, allowing two broken edges to come in the contact, preventing further asphalt pavement deterioration. The quality and speed of the damage repair process strongly depend on the quality of rejuvenator, thus it is important to choose a proper …
An Injectable Thermosensitive Hydrogel Potentially Used For Wound Dressing With Self-Adhesive Properties,
2021
Washington University in St. Louis
An Injectable Thermosensitive Hydrogel Potentially Used For Wound Dressing With Self-Adhesive Properties, Yunxiu Qiu
McKelvey School of Engineering Graduate Student Theses & Dissertations
Wound healing is a complex process, and different kinds of materials are tried to achieve rapid healing. Among them, hydrogel is one of the best candidates for would dressing due to its distinctive properties, such as high biocompatibility, flexibility, and sensitivity to physiological environments. Injectable hydrogels can be facilely delivered in vivo without massive impairment to the body, as no surgical incision is needed for hydrogel embedment. This is highly consistent with the need of minimal invasion on human body. Multiple stimuli could be applied to achieve its injectability, including pH, temperature, light, ions in body fluids. Thermosensitive hydrogel is …
Numerical Study Of A Buckling Restrained Brace (Brb) In Steel Structures And Comparison With A Convergent Ordinary Brace (Ocb) Under Static And Dynamic Loading,
2021
Lecturer, Faculty of Civil Engineering, Ayandegan Institute of Higher Education, Tonekabon, Iran
Numerical Study Of A Buckling Restrained Brace (Brb) In Steel Structures And Comparison With A Convergent Ordinary Brace (Ocb) Under Static And Dynamic Loading, Fatemeh Habibpour
Makara Journal of Technology
Bulk metallic glass (BMG) has good mechanical strength, high hardness, wear resistance, and corrosion resistance with promising application in various industries. However, for the industrial production of BMG, the main issue is how to overcome limitations of joining with other materials. The present study focuses on solder processing at low operating temperature to avoid exceeding the recrystallization temperature. A feasible joining process for BMG was developed using lead-free solders. The BMG surface is pre-plated with copper, nickel, or titanium as a wetting layer. The reaction temperature is set between the glass transition temperature of BMG and the melting point of …
Development Of Novel Phase Change Material (Pcm)-Based Nanocomposites Using Emerging Nanomaterials For Energy Storage Applications,
2021
Universiti Malaya
Development Of Novel Phase Change Material (Pcm)-Based Nanocomposites Using Emerging Nanomaterials For Energy Storage Applications, Navid Aslfattahi
Student Works (2020-2029)
Energy storage is a global critical issue and important area of research as most of the renewable sources of energy are intermittent. In this thesis, novel nanomaterials including recently emerged two-dimensional nanomaterial MXene (Ti3C2), hybrid graphene-silver (Gr-Si), hexagonal boron nitride (hBN), magnesium oxide (MgO) and alumina (Al2O3) nanoparticles are used as additives into various types of organic/inorganic phase change materials (PCMs) for formulation of promising PCM-based nanocomposites to improve their thermo-physical properties. This research work focuses on synthesis, preparation, characterization, thermal storage properties and thermal stability characteristic of new class of nanocomposites induced with advanced/emerging nanomaterials. Novel two_dimensional MXene (Ti3C2) …
Origin Of Magnetism In Γ-Fesi 2 /Si(111) Nanostructures,
2021
Michigan Technological University
Origin Of Magnetism In Γ-Fesi 2 /Si(111) Nanostructures, Liwei D. Geng, Sahil Dhoka, Ilan Goldfarb, Ranjit Pati, Yongmei M. Jin
Michigan Tech Publications, Part 1
Magnetism has recently been observed in nominally nonmagnetic iron disilicide in the form of epitaxial γ-FeSi2 nanostructures on Si(111) substrate. To explore the origin of the magnetism in γ-FeSi2/Si(111) nanostructures, we performed a systematic first-principles study based on density functional theory. Several possible factors, such as epitaxial strain, free surface, interface, and edge, were examined. The calculations show that among these factors, only the edge can lead to the magnetism in γ-FeSi2/Si(111) nanostructures. It is shown that magnetism exhibits a strong dependency on the local atomic structure of the edge. Furthermore, magnetism can be enhanced by creating multiple-step edges. In …
Applied Evanescent Wave On Zinc Oxide Nanorods Coated Glass Surface For Sensing Applications,
2021
Universiti Malaya
Applied Evanescent Wave On Zinc Oxide Nanorods Coated Glass Surface For Sensing Applications, Mohd Hafiz Jali
Student Works (2020-2029)
A simple and workable optical fiber sensor was successfully proposed and demonstrated by integrating the microfiber and the glass surface coated with Zinc Oxide (ZnO) nanorods. It exploited the distinctive features of the large evanescent wave of the microfiber and surface absorption capability of the ZnO nanomaterials coated glass surface to couple with the surrounding analyte. An experimental validation was performed to optimize and verify the sensing performance of the proposed structure. ZnO nanorod growth time of 12-hours and microfiber waist diameter of 6 µm provide optimum sensing results towards the changes of humidity concentration level. The diameter of silica …
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products,
2021
Tashkent state technical University, the department “Metal Forming”
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products, Dorob Murotovich Berdiyev Dsn, Abdulaziz Abdullajanovich Yusupov Head Teacher, Ravshan Kobilovich Tashmatov Doctoral Student, Tuychi Nemat Ogli Ibodullayev Assistant, Kabira Erkinovna Qurbonova Head Teacher
Scientific-technical journal
The use of non-standard modes of heat treatment increases the density of dislocations in the crystal structure of the α-phase and increases the wear resistance of carbon, low-alloy steels under various friction conditions, which is comparable to the results when heated to a standard temperature (Ac3+30÷50 °C). The preliminary extreme heating temperature is determined. After re-quenching at standard temperature and low tempering, the wear resistance of steels under various types of friction increases by up to 40 % compared to standard quenching.
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products,
2021
ashkent state technical University, the department “Metal Forming”
Influence Of Parameters Of Non-Standard Modes Of Heat Treatment On Increasing The Wear Resistance Of Steel Products, Dorob Murotovich Berdiyev Dsn, Abdulaziz Abdullajanovich Yusupov Head Teacher, Ravshan Kobilovich Tashmatov Doctoral Student, Tuychi Nemat Ogli Ibodullayev Assistant, Kabira Erkinovna Qurbonova Head Teacher
Scientific-technical journal
The use of non-standard modes of heat treatment increases the density of dislocations in the crystal structure of the α-phase and increases the wear resistance of carbon, low-alloy steels under various friction conditions, which is comparable to the results when heated to a standard temperature (Ac3+30÷50 °C). The preliminary extreme heating temperature is determined. After re-quenching at standard temperature and low tempering, the wear resistance of steels under various types of friction increases by up to 40 % compared to standard quenching.
Solid State Synthesis And Characterization Of Apatite Based Ceramic Waste Form For The Immobilization Of Radioactive Iodine,
2021
Louisiana State University and Agricultural and Mechanical College
Solid State Synthesis And Characterization Of Apatite Based Ceramic Waste Form For The Immobilization Of Radioactive Iodine, Md Imdadul Islam
LSU Doctoral Dissertations
The growing demand for nuclear power in the United States and worldwide is accountable for addressing the major concern of radioactive waste, involving the technical challenges of maintaining the nuclear fuel cycle and immobilizing high-level wastes for safe disposal in geological storage. The appropriate selection of waste forms for spent nuclear fuel such as fission products and radionuclides can be effective means for a feasible and sustainable nuclear fuel cycle. But highly volatile radionuclides such as iodine (129) are of specific concern due to its extraordinary long half-life (15.7 million years). Due to its poor solubility and high volatility at …
Fabrication And Characterization Of Electrospun Poly(Acrylonitrile-Co-Methyl Acrylate)/Lignin Nanofibers: Effects Of Lignin Type And Total Polymer Concentration,
2021
University of Dayton
Fabrication And Characterization Of Electrospun Poly(Acrylonitrile-Co-Methyl Acrylate)/Lignin Nanofibers: Effects Of Lignin Type And Total Polymer Concentration, Suchitha Devadas, Saja M. Nabat Al-Ajrash, Donald A. Klosterman, Kenya A. Crosson, Garry S. Crosson, Erick S. Vasquez
Chemical and Materials Engineering Faculty Publications
Lignin macromolecules are potential precursor materials for producing electrospun nanofibers for composite applications. However, little is known about the effect of lignin type and blend ratios with synthetic polymers. This study analyzed blends of poly(acrylonitrile-co-methyl acrylate) (PAN-MA) with two types of commercially available lignin, low sulfonate (LSL) and alkali, kraft lignin (AL), in DMF solvent. The electrospinning and polymer blend solution conditions were optimized to produce thermally stable, smooth lignin-based nanofibers with total polymer content of up to 20 wt % in solution and a 50/50 blend weight ratio. Microscopy studies revealed that AL blends possess good solubility, miscibility, and …
Magnetically Induced Demulsification Of Water And Castor Oil Dispersions Stabilized By Fe3o4-Coated Cellulose Nanocrystals,
2021
University of Mississippi
Magnetically Induced Demulsification Of Water And Castor Oil Dispersions Stabilized By Fe3o4-Coated Cellulose Nanocrystals, Mohammad J. Hasan, Frankie A. Petrie, Ashley E. Johnson, Joshua Peltan, Meredith Gannon, Robert T. Busch, Serhiy O. Leontsev, Erick S. Vasquez, Esteban E. Ureña-Benavides
Chemical and Materials Engineering Faculty Publications
Superparamagnetic iron oxide (Fe3O4) nanoparticle (NP) coated cellulose nanocrystals (CNCs) were synthesized and used to prepare emulsions with magnetically controlled stability. Magnetite NPs were deposited onto the surface of wood pulp CNCs (WCNCs) and bacterial CNCs (BCNCs) by a one-step coprecipitation method. The effect of the CNC to Fe3O4 mass ratio (1:1, 1:2, and 1:4) was varied to optimize the colloidal, magnetic and emulsifying properties of the hybrid NPs. TEM images showed that the 1:4 ratios lead to greater coverage of Fe3O4 than lower Fe3O4 loadings (1:1, and 1:2). The CNCs and Fe3O4 appeared to interact via hydrogen bonding between …
Highly Efficient Visible-Light Photocatalytic Ethane Oxidation Into Ethyl Hydroperoxide As A Radical Reservoir,
2021
Shanghai Jiao Tong University
Highly Efficient Visible-Light Photocatalytic Ethane Oxidation Into Ethyl Hydroperoxide As A Radical Reservoir, Yao Zhu, Siyuan Fang, Shaoqin Chen, Youjie Tong, Chunling Wang, Yun Hang Hu
Michigan Tech Publications, Part 1
Photocatalytic ethane conversion into value-added chemicals is a great challenge especially under visible light irradiation. The production of ethyl hydroperoxide (CH CH OOH), which is a promising radical reservoir for regulating the oxidative stress in cells, is even more challenging due to its facile decomposition. Here, we demonstrated a design of a highly efficient visible-light-responsive photocatalyst, Au/WO , for ethane oxidation into CH CH OOH, achieving an impressive yield of 1887 μmol g in two hours under visible light irradiation at room temperature for the first time. Furthermore, thermal energy was introduced into the photocatalytic system to increase the driving …
Fabrication And Characterization Methods Of Self-Cleaning Coatings For Solar Panels Application,
2021
University of South Florida
Fabrication And Characterization Methods Of Self-Cleaning Coatings For Solar Panels Application, Mohammed Khaleel M Alhussain
USF Tampa Graduate Theses and Dissertations
Transparent self-cleaning coatings with superhydrophobic and superhydrophilic behavior are of great interest in a wide range of industrial applications such as automotive, solar panels, windows, and optical devices. Each has its uses, properties, and characteristics. For the use of these coatings on solar panels, certain features are important in maintaining the efficiency of the panels in different weather conditions and reducing the operation and maintenance cost, such as self-cleaning, high transparency, antifouling, anti-fogging, and anti-icing. Herein, we have investigated the fabrication of self-cleaning coatings using two simple methods and ways to improve their characteristics. In the first method, a hydrophobic …
Spent Tea Leaves As An Adsorbent For Micro Solid Phase Extraction Of Polycyclic Aromatic Hydrocarbons In Different Matrices,
2021
Universiti Malaya
Spent Tea Leaves As An Adsorbent For Micro Solid Phase Extraction Of Polycyclic Aromatic Hydrocarbons In Different Matrices, Nazzatul Atirah Mohd Nazir
Student Works (2020-2029)
Food and water may be contaminated by hazardous pollutants, one of is a polycyclic aromatic hydrocarbon (PAHs), where 16 of pollutant in this group listed as a priority pollutant by Environmental Protection Agency (EPA). Thus, analysis of food contaminations is crucial for consumer safety. Therefore, a simple, sensitive, and miniaturize sample preparations are needed. In this study, spent tea leaves (STL), a waste from brewed tea, Camellia sinensis was utilized as novel micro-solid phase extraction (μ-SPE) sorbent for the determination of polycyclic aromatic hydrocarbon (PAHs) for the first time. It was of interest that spent tea leaves (STL) might serve …
Nanocellulose Sheets From Oil Palm Empty Fruit Bunches Treated With Naoh Solution,
2021
IPB University (Bogor Agricultural University)
Nanocellulose Sheets From Oil Palm Empty Fruit Bunches Treated With Naoh Solution, Farah Fahma, Faiza Ayu Lestari, Ika Amalia Kartika, Nurmalisa Lisdayana, Evi Savitri Iriani
Karbala International Journal of Modern Science
The objective of this study is to produce nanocellulose sheets from oil palm empty fruit bunches (OPEFBs). Nanocellulose sheets from OPEFBs were prepared through the dewatering process using vacuum filtration. Subsequently, the produced sheets were treated with NaOH solution to improve the mechanical stability of their structure, causing them to be firm in water. The water absorption of nanocellulose sheet increased with increasing NaOH concentrations up to 20 wt%, increasing tensile strength, and Young’s modulus, but decreased when they were treated with 30 wt%. The diameter shrinkage of nanocellulose sheets was directly proportional to the NaOH concentration and soaking time. …
Progress In Proton-Conducting Oxides As Electrolytes For Low-Temperature Solid Oxide Fuel Cells: From Materials To Devices,
2021
Michigan Technological University
Progress In Proton-Conducting Oxides As Electrolytes For Low-Temperature Solid Oxide Fuel Cells: From Materials To Devices, Wei Zhang, Yun Hang Hu
Michigan Tech Publications, Part 1
Among various types of alternative energy devices, solid oxide fuel cells (SOFCs) operating at low temperatures (300-600°C) show the advantages for both stationary and mobile electricity production. Proton-conducting oxides as electrolyte materials play a critical role in the low-temperature SOFCs (LT-SOFCs). This review summarizes progress in proton-conducting solid oxide electrolytes for LT-SOFCs from materials to devices, with emphases on (1) strategies that have been proposed to tune the structures and properties of proton-conducting oxides and ceramics, (2) techniques that have been employed for improving the performance of the protonic ceramic-based SOFCs (known as PCFCs), and (3) challenges and opportunities in …
Universal Image Segmentation For Optical Identification Of 2d Materials,
2021
University of Nevada, Las Vegas
Universal Image Segmentation For Optical Identification Of 2d Materials, Joshua Island, Randy M. Sterbentz, Kristine L. Haley
Physics & Astronomy Faculty Research
Machine learning methods are changing the way data is analyzed. One of the most powerful and widespread applications of these techniques is in image segmentation wherein disparate objects of a digital image are partitioned and classified. Here we present an image segmentation program incorporating a series of unsupervised clustering algorithms for the automatic thickness identification of two-dimensional materials from digital optical microscopy images. The program identifies mono- and few-layer flakes of a variety of materials on both opaque and transparent substrates with a pixel accuracy of roughly 95%. Contrasting with previous attempts, application generality is achieved through preservation and analysis …
