Physics Commons^™

Selection Of An Internal Standard To Determine Mass Concentration Of Uranium In Human Urine By Inductively Coupled Plasma Mass-Spectrometry, V. V. Kolbin, M. T. Dyuisembaeva, N. Zh. Mukhamediyarov, A. Zh. Tashekova, G. M. Yesilkanov, Ye. Z. Shakenov, A.Ye. Temirzhanova

Eurasian Journal of Physics and Functional Materials

The paper presents experimental studies on the choice of an internal standard in order to correction the matrix effect that occurs when determining uranium in human urine by inductively coupled plasma mass spectrometry. Monoelemental standard solutions of Sc-45, Rh-103, In-115, Ir-193, Th-232 were used as internal standards. The levels of the decrease in the sensitivity of analytical signals of internal standards and uranium spikes under the influence of the matrix effect were determined. The ratio of the measured concentration of internal standards in the background solution of 5% nitric acid and in the matrix of the urine simulator was found …

Thermal Conductivity Of New Nanocomposite Superionic Semiconductors K0.01cu1.96s, K0.02cu1.95s, K0.03cu1.94s, K0.04cu1.93s, K0.05cu1.94s, M. M. Kubenova, M. Kh. Balapanov, R. Kh. Ishembetov, K. A. Kuterbekov, R. F. Almukhametov, K. Zh. Bekmyrza, A. M. Kabyshev, R. Sh. Palymbetov, L. U. Taimuratova

Eurasian Journal of Physics and Functional Materials

In this work, we investigated the effect of nanostructuring on the thermoelectric and thermal properties of nonstoichiometric solid splavs doped with copper sulfides with potassium. The synthesized alloys K_0.01Cu_1.96S, K_0.02Cu_1.95S, K_0.03Cu_1.94S, K_0.04Cu_1.93S, K_0.05Cu_1.94S are nanocomposite. The crystallite sizes of the synthesized powder, as estimated from the half-width of X-ray diffraction lines, range from 7 to 180 nm. Sample K_0.01Cu_1.96S is a mixture of phases consisting of chalcocite Cu₂S (82%), jarleite Cu_1.96S (12%), …

Deformation-Stimulated Luminescence Of A Kbr Crystal Matrix, K. Shunkeyev, A. Tilep, Sh. Sagimbayeva, Zh. Ubaev

Eurasian Journal of Physics and Functional Materials

Radiative relaxations of electronic excitations - self-trapped excitons (STE) in regular lattice sites (intrinsic luminescence) and exciton-like formations (ELF) in the field of homologous cations (exciton-like luminescence). It has been found that the maximum effect of luminescence enhancement occurs upon uniaxial deformation along the <110> crystallographic direction (compared to <100>), which coincides with the direction of the self-trapped anion exciton (<110>) in the KBr crystal matrix. The exciton mechanism was estimated from the increase in the intensity of the intrinsic s(4, 42eV) - and p(2, 3eV) - luminescences of STE, and the enhancement of luminescence intensity of near-single Na^{+ …}

Compact And Sustainable Electronic Module For Silicon Photodetectors, A. Sadigov, S. Nuruyev, R. Akbarov, D. B. Berikov, A. Madadzada, A. Mammadli, S. Lyubchyk, E. Yilmaz

Eurasian Journal of Physics and Functional Materials

This article presents the development of a cost-effective and efficient electronic module for silicon photodetectors (SiPM). The electronic module combines essential functionalities, such as a high voltage power supply, a preamplifier, and a signal comparator, into a compact circuit. A high voltage power supply with a range of 30 to 140 V provides a stable bias voltage with 0.01 V accuracy, while a preamplifier with 40 gain and 250 MHz bandwidth enables signal amplification necessary to extract weak signals. The comparator converts an analogue signal (higher than 8 mV) into TTL (transistor-transistor logic), which makes it easy to process and …

The Role Of Leading-Edge Serrations In Controlling The Flow Over Owls’ Wing, Tanner Saussaman, Asif Nafi, David Charland, Hadar Ben-Gida, Roi Gurka

Physics and Engineering Science

We studied the effects of leading-edge serrations on the flow dynamics developed over an owl wing model. Owls are predatory birds. Most owl species are nocturnal, with some active during the day. The nocturnal ones feature stealth capabilities that are partially attributed to their wing microfeatures. One of these microfeatures is small rigid combs (i.e. serrations) aligned at an angle with respect to the incoming flow located at the wings' leading-edge region of the primaries. These serrations are essentially passive flow control devices that enhance some of the owls' flight characteristics, such as aeroacoustics and, potentially, aerodynamics. We performed a …

Optimizing Mn-Al Permanent Magnet Performance Through Control Of The Phase Transformation, Ternary Element Addition, And Advanced Processing, Thomas R. Keller

Dartmouth College Ph.D Dissertations

The growing need for electrical power in machines and vehicles brings with it a growing need for critical materials. The current high-performance permanent magnets (PMs) based on rare-earth (RE) elements Nd and Sm cannot escape the problem of raw material cost, geographic scarcity in the earth’s crust, and lack of circular global supply chains. This poses a problem of industrial ecology: can PMs be made from inexpensive, more abundant materials while still meeting sufficient performance criteria? PMs based on the magnetic τ phase of Mn-Al offer a possible alternative to REPMs. However, years of innovation have not yet achieved real-world …

62nd Annual Rocky Mountain Conference On Magnetic Resonance

Rocky Mountain Conference on Magnetic Resonance

Final program, abstracts, and information about the 62nd 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 Sonesta Denver Downtown, Denver, Colorado, July 23-27, 2023.

Intrinsic Point Defects (Vacancies And Antisites) In Cdgep2 Crystals, Timothy D. Gustafson, Nancy C. Giles, Peter G. Schunemann, Kevin T. Zawilski, Kent L. Averett, Jonathan E. Slagle, Larry E. Halliburton

Faculty Publications

Cadmium germanium diphosphide (CdGeP₂) crystals, with versatile terahertz-generating properties, belong to the chalcopyrite family of nonlinear optical materials. Other widely investigated members of this family are ZnGeP₂ and CdSiP₂. The room-temperature absorption edge of CdGeP₂ is near 1.72 eV (720 nm). Cadmium vacancies, phosphorous vacancies, and germanium-on-cadmium antisites are present in as-grown CdGeP₂ crystals. These unintentional intrinsic point defects are best studied below room temperature with electron paramagnetic resonance (EPR) and optical absorption. Prior to exposure to light, the defects are in charge states that have no unpaired spins. Illuminating a CdGeP_{2 …}

Influence Of Substitutions On The Structure, Ionic Conductivity, And Phase Transitions In The System Of Na3fe2(1-X)Sc2x(Po4)3 (0≤X≤0.06) Solid Solutions, A.S. Nogai, A.A. Nogai, E.A. Nogai, A.A. Bush, D.E. Uskenbaev

Eurasian Journal of Physics and Functional Materials

The article presents data on the study of the effect of substitutions of M-cations in the system of Na₃Fe_2(1-x)Sc_2x(PO₄)₃ solid solutions (in the concentration range 0≤x≤0.06) on the crystal structure, ionic conductivity, and also on the temperature of phase transitions T_a→b, T_b→g. It is shown that samples of Na₃Fe_2(1-x)Sc_2x(PO₄)₃ (0≤x≤0.06) solid solutions are monoclinically distorted, and the structure parameters increase linearly with increasing dopant concentration. Moreover, in the studied samples of solid solutions, an increase in the conductivity …

Non-Destructive Structural Studies Of Ceramic Fragments Of Ancient Tribes Of Kazakhstan, A.Zh. Zhomartova, B.A. Bakirov, S.E. Kichanov, R.S. Zhumatayev, A.T. Toleubayev, S. Shakenov, D.P. Kozlenko

Eurasian Journal of Physics and Functional Materials

The phase composition of several fragments of the ancient ceramic of the early medieval settlement of Asusay and burial ground Eleke Sazy in the modern Republic of Kazakhstan has been studied using neutron diffraction and Raman spectroscopy. The quartz, calcite, and feldspar minerals are dominant phases in the studied ceramic fragments. The fractions of those phases were obtained. The spatial arrangement of inner components inside volumes of fragments was determined using neutron tomography. The pores in the ceramic fragments were segmented, and the porosity for each sample was obtained. The phase composition and internal pores are discussed within the framework …

Research On Ferroelectric-Piezoelectric Properties And Relaxor Phase Transition Characteristics Of Pslzt-Bmt Ceramics, N.V. Thinh, L.D. Vuong, D.V. On, T.V. Chuong, L.V. Truong Son, T.N. Dat, L.V. Thanh Son, V.T. Tung

Eurasian Journal of Physics and Functional Materials

(1-x)[(Pb_0.94Sr_0.05La_0.01)(Zr_0.54Ti_0.46)_0.9975O₃]-x[Bi(Mn _1/2 Ti_1/2 )O₃] ceramics with x in the range of 0–0.05 mol were successfully synthesized following the conventional solid-phase route. The materials were thoroughly investigated to study their structural phase, microstructure, ferro-piezoelectric characteristics, and dielectric behavior. The addition of BMT to PSLZT contributed to the transition of the tetragonal phase to the rhombohedral phase and an increase in the mechanical quality coefficient Qm of the material. The value of the electromechanical coupling coefficient k_p =0.66, the value of k_t=0.53, …

Electron-Hole Trapping Centers In Alkali Metal Sulfates With Dy3+ Impurities, T.N. Nurakhmetov, T.T. Alibay, R.Z. Bakhtizin, S. Pazylbek, A.Zh. Kainarbay, A.M. Zhunusbekov, B.M. Sadykova, D.A. Tolekov, R.K. Shamieva, A.S. Nurpeissov

Eurasian Journal of Physics and Functional Materials

The Na₂SO₄ − Dy samples were obtained by slow evaporation method. The spectroscopic methods were used to study the mechanisms of formation of electron and hole trapping centers. Intrinsic recombination emission of 2.9–3.1 eV and impurity emission of 2.55 eV and 2.15 eV are excited at 4.0–4.5 eV. Intrinsic SO³⁻₄− SO⁻₄ and impurity Dy²⁺−SO⁻₄ trapping centers were revealed. The local levels corresponding between the electron and hole trapping center are 4.0–4.5 eV.

Influence Of Surfactants On The Formation And Growth Of Cadmium Telluride Nanoplatelets, A.S. Akhmetova, A.K. Ospanova, B.N. Yussupbekova, T.T. Alibay

Eurasian Journal of Physics and Functional Materials

The article presents a comprehensive review of the current research on the use of surfactants in CdTe nanoplatelet synthesis, including a discussion of the various types of surfactants that have been used and their effects on nanoplatelet size, shape, and optical properties. Additionally, the article examines the mechanisms by which surfactants influence the growth and morphology of CdTe nanoplatelets, with a focus on the role of surfactant, size, and structure. Overall, this article provides a detailed analysis of the use of surfactants in the synthesis of CdTe nanoplatelets and highlights the potential for this approach to improve the performance of …

Thermal, Magnetic, And Electrical Properties Of Thin Films And Nanostructures: From Magnetic Insulators To Organic Thermoelectrics, Michael J. M. Roos

Electronic Theses and Dissertations

Modern fabrication and growth techniques allow for the development of increasingly smaller and more complex solid state structures, the characterization of which require highly specialized measurement platforms. In this dissertation I present the development of techniques and instrumentation used in magnetic, thermal, and electrical property measurements of thin films and nanostructures. The understanding of trapped-flux induced artifacts in SQUID magnetometry of large paramagnetic substrates allows for the resolution of increasingly small moments. Using these methods, the antiferromagnetic coupling of the interface between a Y₃Fe₅O₁₂ film and Gd₃Ga₅O₁₂substrate is quantitatively …

Effective Nanomembranes From Chitosan/Pva Blend Decorated Graphene Oxide With Gum Rosin And Silver Nanoparticles For Removal Of Heavy Metals And Microbes From Water Resources, Mohamed Morsy

Nanotechnology Research Centre

No abstract provided.

Method Of Evanescently Coupling Whispering Gallery Mode Optical Resonators Using Liquids, Hengky Chandrahalim, Kyle T. Bodily

AFIT Patents

The present invention relates to evanescently coupling whispering gallery mode optical resonators having a liquid coupling as well as methods of making and using same. The aforementioned evanescently coupling whispering gallery mode optical resonators having a liquid couplings provide increased tunability and sensing selectivity over current same. The aforementioned. Applicants’ method of making evanescent-wave coupled optical resonators can be achieved while having coupling gap dimensions that can be fabricated using standard photolithography. Thus economic, rapid, and mass production of coupled WGM resonators-based lasers, sensors, and signal processors for a broad range of applications can be realized.

Influence Of Platinum Nanoparticles On Ionic Transport And Hydrogen Reactivity Of Yttria-Stabilized Zirconia Thin Films, Firas Mahyob

Electronic Theses and Dissertations

Yttria-stabilized zirconia (YSZ) is a widely used ceramic material in solid oxide fuel cells, oxygen sensors, and sensing applications due to its high ionic conductivity, chemical inertness, and thermal stability. YSZ is promising active coating for use in miniaturized harsh environment wireless surface acoustic sensors to monitor gases such as H₂. Adding catalytic Pt nanoparticles can enhance gas reactivity and lead to associated film conductivity changes.

In this work, thin films with an (8% Y₂O₃ - 92% ZrO₂) composition were deposited onto piezoelectric langasite substrates using RF magnetron sputtering in Ar:O₂ - …

Machine Learning-Based Data And Model Driven Bayesian Uncertanity Quantification Of Inverse Problems For Suspended Non-Structural System, Zhiyuan Qin

All Dissertations

Inverse problems involve extracting the internal structure of a physical system from noisy measurement data. In many fields, the Bayesian inference is used to address the ill-conditioned nature of the inverse problem by incorporating prior information through an initial distribution. In the nonparametric Bayesian framework, surrogate models such as Gaussian Processes or Deep Neural Networks are used as flexible and effective probabilistic modeling tools to overcome the high-dimensional curse and reduce computational costs. In practical systems and computer models, uncertainties can be addressed through parameter calibration, sensitivity analysis, and uncertainty quantification, leading to improved reliability and robustness of decision and …

Assessment Of Bridge Pier Response To Fire, Vehicle Impact, And Air Blast, Chen Fang, Qusai Alomari, Daniel G. Linzell

Department of Civil and Environmental Engineering: Dissertations, Theses, and Student Research

Highway bridges exposed to intentional or unintentional fire followed by combined vehicle impact and air blast are at risk of significant damage and, possibly, collapse. Limited studies examining the complex effects of these extreme demands on bridge support elements and parametrizing their response and damage are found in the open literature. Research that is presented is part of an ongoing numerical investigation examining round, multi-column, reinforced concrete (RC), bridge pier behavior subject to multi-hazard scenarios involving fire, vehicle impact, and air blast. Detailed nonlinear finite element analysis models of single columns and multi-column piers supported by a pile foundation system …

Super P-Sulfur Cathodes For Quasi-Solid-State Lithium-Sulfur-Batteries., Milinda Bharatha Kalutara Koralalage

Electronic Theses and Dissertations

Lithium-Sulfur (Li-S) batteries have become a promising candidate to meet the current energy storage demand, with its natural abundance of materials, high theoretical capacity of 1672 mAhg-1, high energy density of 2600 Whkg-1, low cost and lower environmental impact. Sulfide based solid state electrolytes (SSEs) have received greater attention due to their higher ionic conductivity, compatible interface with sulfur-based cathodes, and lower grain boundary resistance. However, the interface between SSEs and cathodes has become a challenge in all solid-state Li-S batteries due to the rigidity of the participating surfaces. A hybrid electrolyte containing SSE coupled with a small amount of …

Fabrication Of Black Phosphorus Terahertz Photoconductive Antennas, Nathan Tanner Sawyers

Physics Undergraduate Honors Theses

Terahertz (THz) photoconductive antennas (PCAs) using 40nm thin-film flakes of black phosphorus (BP) and hexagonal boron nitride (hBN) have been shown computationally to be capable of THz emission comparable to those based on GaAs [2]. In this paper, I briefly describe the scientific and practical interest in THz emissions and explain what warrants research into black phosphorus as a photoconductive semiconductor in THz devices. Furthermore, I outline the basic principle of how these antennas work and mention alternative designs produced by other researchers in the past. Finally, I summarize the fabrication process of these antennas, as well as the measurements …

Understanding And Tuning Magnetism In Van Der Waals Magnetic Compounds, Rabindra Basnet

Graduate Theses and Dissertations

The recently discovered two-dimensional (2D) magnetism has attracted intensive attention due to possible magnetic phenomenon arising from 2D magnetism and their promising potential for spintronics applications. The advances in 2D magnetism have motivated the study of layered magnetic materials, and further enhanced our ability to tune their magnetic properties. Among various layered magnets, tunable magnetism has been widely investigated in metal thiophosphates MPX3. It is a class of magnetic van der Waals (vdW) materials with antiferromagnetic ordering persisting down to atomically thin limit. Their magnetism originates from the localized moments due to 3d electrons in transition metal ions. So, their …

Measurements Of Magnetic Field Penetration Of Materials For Superconducting Radiofrequency Cavities, Iresha Harshani Senevirathne

Physics Theses & Dissertations

Superconducting Radio Frequency (SRF) cavities used in particle accelerators are typically formed from or coated with superconducting materials. Currently high purity niobium is the material of choice for SRF cavities which have been optimized to operate near their theoretical field limits. This brings about the need for significant R&D efforts to develop next generation superconducting materials which could outperform Nb and keep up with the demands of new accelerator facilities. To achieve high quality factors and accelerating gradients, the cavity material should be able to remain in the superconducting Meissner state under high RF magnetic field without penetration of quantized …

Nb3Sn Coating Of Twin Axis Cavity And Other Complex Srf Cavity Structures, Jayendrika Kumari Tiskumara

Physics Theses & Dissertations

In the field of Accelerator Science, for the low cost and increased quality factor, thin films coated niobium cavities are used in the modern SRF research. Within the potential substances, Nb₃Sn has shown higher critical temperature than niobium. Here the tin vapor diffusion method is used as the preferred technique to coat niobium cavities. So far, only elliptical cavities have been coated with Nb₃Sn and this technique has not yet been applied to cavities with complex geometries, which are also helpful in the accelerator science field. The Half-wave resonator could provide us data across frequencies of …

Optical Fiber Tip Micro Anemometer, Jeremiah C. Williams, Hengky Chandrahalim

AFIT Patents

A passive microscopic flow sensor includes a three-dimensional microscopic optical structure formed on a cleaved tip of an optical fiber. The three-dimensional microscopic optical structure includes a post attached off-center to and extending longitudinally from the cleaved tip of the optical fiber. A rotor of the three-dimensional microscopic optical structure is received for rotation on the post. The rotor has more than one blade. Each blade has a reflective undersurface that reflects a light signal back through the optical fiber when center aligned with the optical fiber, the blades of the rotor shaped to rotate at a rate related to …

Femtotesla Magnetometry And Nanoscale Imaging With Color Centers In Diamond, Yaser Silani

Optical Science and Engineering ETDs

Intriguing photophysical properties of color centers in diamond make them ideal candidates for many applications from imaging and sensing to quantum networking. In the first part of this work, we have studied the silicon vacancy (SiV) centers in diamond for nanoscale imaging applications. We showed that these centers are promising fluorophores for Stimulated Emission Depletion (STED) microscopy, owing to their photostable, near-infrared emission and favorable photophysical properties. In the second part, we built a femtotesla Radio-Frequency (RF) magnetometer based on the diamond nitrogen vacancy (NV) centers and magnetic flux concentrators. We used this sensor to remotely detect Nuclear Quadrupole Resonance …

Electron-Hole Trapping Centers In Na2so4 With A Transition Metal Impurity Mn, T.N. Nurakhmetov, T.T. Alibay, S. Pazylbek, A.M. Zhunusbekov, B.M. Sadykova, D.A. Tolekov, R.K. Shamieva, A.S. Nurpeissov

Eurasian Journal of Physics and Functional Materials

The Na₂SO₄ samples were obtained by slow evaporation method. The mechanisms of the formation of electron and hole trapping centers are investigated by spectroscopic methods. Intrinsic recombination emission of 2.9–3.1 eV and impurity emission of 1.85 eV are excited at 4.0–4.5 eV. Intrinsic SO³⁻₄−SO⁻₄ and impurity Mn⁺ − SO⁻₄ trapping centers were revealed. The local levels corresponding between the electron and hole trapping center are 4.0–4.5 eV. The decay of intrinsic and impurity trapping centers was recorded at temperatures of 130–150 K and 280–350 K.

Luminescent Properties Of Baxmg(2−X)F4:W Ceramics, T.A. Koketai, A.V. Strelkova, A.M. Zhunusbekov, Zh.T. Karipbayev, L.A. Lisitsyna, A.M. Chakin

Eurasian Journal of Physics and Functional Materials

Ceramics based on alkaline earth metal fluorides activated by tungsten has been obtained by radiation synthesis. The synthesis was realized by direct action on the mixture with an activator of a powerful flow of high-energy electrons without the use of any additives to facilitate the synthesis. It has been established that the resulting ceramics have luminescent properties characteristic of tungsten-activated materials based on metal fluorides.

Synthesis Of Silver Nanoparticles By Green Method Using Ligustrum Sinense To Study Their Structural And Photoluminescence Properties, Sh.A. Khan, S. Patel, P. Shukla, R. Kumar, R. Dixit

Eurasian Journal of Physics and Functional Materials

Photoelectronic devices such as solar cells require an electrolyte with electrode that has high energy conversion efficiency. Hence, ionic electrolyte and blend polymer composite electrolyte helps in ion regeneration and improving the performance of the device. Introduction of metal nanoparticles in the polymers such as the PMMA, PVDF provides this enhancement of performance. Nanoparticles are manufactured in an eco-friendly manner and characterized by UV and XRD. In this work we present the possibility that could be explored with the incorporation of nanoparticles and also see the synthesis process of green nanoparticles. The excitons dissociation in these devices could increase with …

Thermal And Electrical Properties Of Nanocrystalline Superionic Naxcu1.75s (X=0.1, 0.15, 0.2, 25) Compounds, M.M. Kubenova, K.A. Kuterbekov, M.Kh. Balapanov, R.Kh. Ishembetov, B.M. Akhmetgaliev, A.M. Kabyshev, K.Zh. Bekmyrza, M.Kh. Zeleev, R.Sh. Palymbetov, B.U. Baikhozhaeva

Eurasian Journal of Physics and Functional Materials

The paper presents the results of the studies of thermal properties of nanocrystalline superionic Na_xCu_1.75S (x = 0.1, 0.15, 0.2, 25) compositions, and preliminary results of Na_0.1Cu_1.75S using as energy stored cathode material in Na-ion half-cell with NaPF₆ electrolyte and Na anode. The compositions contain a few copper sulfide phases: monoclinic chalcocite Cu₂S, orthorhombic anilite Cu_1.75S, triclinic roxbyite Cu_1.74÷1.82S, also the compositions can contain monoclinic Na₂Cu₄S₃, orthorhombic Na₂S, cubic Cu₂O as inclusion phases. The sizes …