• Major Research Groupings | Institute Of Infectious Disease ...

    2022-1-9 · For information on South Africa''s response to COVID-19 please visit the COVID-19 Corona Virus South African Resource Portal.Phosphorescence and electron traps II. The interpretation ...Bartram R, Kappers L, Hamilton D, Lempicki A, Brecher C, Glodo J, Gaysinskiy V and Ovechkina E (2006) Suppression of afterglow in CsI:Tl by codoping with Eu2+—II: Theoretical model, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 10.1016/j.nima.2005.11.051, 558:2 ...

  • RILEM

    The International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM) was founded with the aim to promote scientific cooperation in the area of construction materials and structures worldwide. This mission is achieved through collaboration of leading experts in construction practice and science including academics, researchers, …Study on Tool-Path Generation for Ultra ... - Scientific In this study, a computer numerical control (CNC) programming software platform for ultra precision machining of optical surfaces was developed based on an MS Windows application framework and openGL. Using cylindrical coordinates, the tool path can be generated based on the polar angle, radius and a linear coordinate of the Z-axis, as well as cutting tool nose radius …

  • Materials for optical fiber lasers: A review: Applied ...

    2018-10-17 · For silica-based preforms, the fiber draw temperature typically corresponds to a glass viscosity of about 10 6 poise (10 5 Pa⋅s), which is between about 1925 °C and 2000 °C. Initially, the temperature is raised above the draw temperature in order to hasten softening of the preform and facilitates the formation of a "drop" or "gob ...Luminescent perovskites: recent advances in theory and ...Luminescent perovskites: recent advances in theory and experiments. Zhen Song, Jing Zhao * and Quanlin Liu * Beijing Key Laboratory for New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science …

  • Eu Incorporation into Sol−Gel Silica for Photonic ...

    The problem of Eu incorporation into silica as dispersed dopants, clusters, separate-phase nanoparticles, or nanocrystals, which is of key importance for applications in …Synthesis and Luminescence Properties of ... - scientific YVO4:Eu3+ nanocrystals were synthesized using a sol-gel method which citric acid was used as complexing agent and ethylene glycol was used as coupler. In order to study the influence of heat treating temperature and time on structure and luminescence properties of YVO4:Eu3 nanocrystals, the dry gels were heated at 400 oC, 500 oC and 600 oC for 1 h, 600 o C for 3 h, …

  • Mesolithic Site Formation and Palaeoenvironment Along …

    2011-6-16 · The Mesolithic period represents a key stage in the human history of Sudan, but its complexity is not yet fully understood. Since the beginning of prehistoric research in this region, efforts were made to understand Mesolithic site formation processes and post-depositional disturbances. Responsibility for the destruction of most Mesolithic sites'' deposits rests mainly …96 AUTHOR INDEXBrecher, Arline. $100,000 Reward Offered to End Fluoride Controversy #141, p.28. AMA Issues Warning About On-Line Medical Advice #141, p.29. Alternative Medicine Connection #138, p.14. Alternative Medicine Connection #143, p.18. Alternative Medicine Connection #144, p.26

  • Erbium in silicon and silicon-germanium

    2001-1-1 · Publisher Summary. This chapter deals with the erbium-doped silicon system and erbium-doped silicon-germanium. The introductory section begins with a brief description of the motivation for making a silicon light emitter and the basic concepts of excitation and recombination in these systems. Silicon is an indirect band gap semiconductor, and ...BSTJ Archive - Telephone Collectors2022-1-8 · Telephone Collectors International was incorporated under the laws of the state of Kansas on May 13, 1986. The goal of the organization is "to educate the public, as well as the members of the Corporation, regarding the history of telephony, the value of old telephones and related items, their collectability and preservation; to research telephone history and publish …

  • Analysis of wear of fused silica moulding using glassy ...

    2016-6-11 · Optical components made of fused silica are in great demand due to the material''s exceptional properties: a broad transmission range from 185 nm to 2.5 μm, low coefficient of thermal expansion, low thermal conductivity and high radiation resistance. For the production of complex optical components in medium and large quantities, the technology of precision glass …Physics Procedia | Laser Assisted Net shape Engineering 7 ...Laser Assisted Net shape Engineering 7 (LANE 2012) Edited by M. Schmidt, F. Vollertsen, M. Geiger. Volume 39, ... Christian Brecher, Maximilian Wegener, Daniel Heinen, ... Dennis Do-Khac. Pages 346-353 Download PDF. ... select article Laser Micro-Structuring of Fused Silica Subsequent to Plasma-Induced Silicon Suboxide Generation and Hydrogen ...

  • Bulk growth, structural, optical and mechanical properties ...

    2022-1-1 · The vibrational band frequencies rely on the nature, relative intensity, position and magnitude on the crystal structure .The compound was subjected to Fourier transform infrared spectroscopy (FT-IR) in the range 4000–400 cm −1.The observed fundamental modes of vibration are recorded and shown in Fig. 5.The band at 3329 cm −1 is assigned to the N-H asymmetric …Erbium in silicon and silicon-germanium - ScienceDirect2001-1-1 · Publisher Summary. This chapter deals with the erbium-doped silicon system and erbium-doped silicon-germanium. The introductory section begins with a brief description of the motivation for making a silicon light emitter and the basic concepts of excitation and recombination in these systems. Silicon is an indirect band gap semiconductor, and ...

  • Preparation and Characterization of a New ...

    Europium-doped Lu2O3 nanocrystalline powders were prepared via a novel solution combustion route, with glycine as the fuel. The crystalline size and specific surface area of the combustion derived powders are strongly dependent on the glycine-to-nitrate ratio, which can control the combustion flame temperature. XRD, SEM, TEM and BET were used to characterize the …Materials development and potential applications of ...2020-1-1 · Transparent ceramics have various potential applications such as infrared (IR) windows/domes, lamp envelopes, opto-electric components/devices, composite armors, and screens for smartphones and they can be used as host materials for solid-state lasers.

  • Materials development and potential applications of ...

    2020-1-1 · Transparent ceramics have various potential applications such as infrared (IR) windows/domes, lamp envelopes, opto-electric components/devices, composite armors, and screens for smartphones and they can be used as host materials for solid-state lasers.Synthesis and Luminescent Properties of ... - scientific [11] Jerzy Sokolnicki, Photoluminescence and structural characteristics of Lu2O3: Eu3+ nanocrystallites in silica matrix, Journal of Solid State Chemistry. 180 (2007) 2400-2408. DOI: 10.1016/j.jssc.2007.06.015

  • Laser Assisted Milling of Ti-6Al-4V ELI with the Analysis ...

    2015-7-8 · This study presents the experimental evaluation of laser assisted milling (LAML) of Ti-6AL-4V ELI (Ti-64), which is used in the orthopedic industry, by using localized preheating of the workpiece via laser irradiation. Improvements to the machinability of this material with LAML are assessed while considering the surface integrity. Suitable laser heating conditions as well as …Green Manufacturing - Scientific Green manufacturing concept has become a cutting edge in the field of sustainable machining. The prime objective of the philosophy is to find a technique in machining or material removal processes that are environmentally friendly, with minimal wastage, energy efficient and optimal condition for the machining processes. This review paper discusses the significance of …

  • Materials development and potential applications of ...

    2020-1-1 · Transparent ceramics have various potential applications such as infrared (IR) windows/domes, lamp envelopes, opto-electric components/devices, composite armors, and screens for smartphones and they can be used as host materials for solid-state lasers.Pultruded materials and structures: A review - Alexander ...2020-5-16 · Brack A, Janssen H and Brecher C. Manufacturing of miniaturized thermoplastic frp components using a novel reaction injection pultrusion process. In: International SAMPE technical conference society for the advancement of material and process engineering (ed …

  • Green Manufacturing

    Green manufacturing concept has become a cutting edge in the field of sustainable machining. The prime objective of the philosophy is to find a technique in machining or material removal processes that are environmentally friendly, with minimal wastage, energy efficient and optimal condition for the machining processes. This review paper discusses the significance of …Multifunctional Sodium Lanthanide Silicates: From Blue ...TbSiO-CJI was prepared by the mild hydrothermal reaction of a mixture of fumed silica and water in a 1.0:0.12:8.46:58 molar ratio at 230°C for 6 days in a Teflon lined stainless steel autoclave.

  • BSTJ Archive

    2022-1-8 · Telephone Collectors International was incorporated under the laws of the state of Kansas on May 13, 1986. The goal of the organization is "to educate the public, as well as the members of the Corporation, regarding the history of telephony, the value of old telephones and related items, their collectability and preservation; to research telephone history and publish …96 AUTHOR INDEXBrecher, Arline. $100,000 Reward Offered to End Fluoride Controversy #141, p.28. AMA Issues Warning About On-Line Medical Advice #141, p.29. Alternative Medicine Connection #138, p.14. Alternative Medicine Connection #143, p.18. Alternative Medicine Connection #144, p.26

  • Pultruded materials and structures: A review

    2020-5-16 · Brack A, Janssen H and Brecher C. Manufacturing of miniaturized thermoplastic frp components using a novel reaction injection pultrusion process. In: International SAMPE technical conference society for the advancement of material and process engineering (ed …(PDF) Aqueous routes to lanthanide-doped oxide …functionalized particles in polymers or sol–gel silica matrices. 5. These applications all require the development of liquid-phase. syntheses to prepare size-controlled, monodisperse, and bright.

  • Biosynthesis of Cytidine Diphosphate

    2014-1-30 · The silica gels with and without CaSO4 binder used for thin-layer chromatography were Camag products (Camag, Inc., Mil-waukee, Wis.). All solvents were reagent grade. Calcein was obtained from Fisher Scientific Company, Pittsburgh, Pa. Platelet separation. Human platelets were prepared from volumes of 25-100 ml of whole blood by the method ofProduction Engineering 2020-2021- ...2021-12-31 · Production Engineering2020-20211.636。、、!

  • Preparation and Characterization of a New ...

    Europium-doped Lu2O3 nanocrystalline powders were prepared via a novel solution combustion route, with glycine as the fuel. The crystalline size and specific surface area of the combustion derived powders are strongly dependent on the glycine-to-nitrate ratio, which can control the combustion flame temperature. XRD, SEM, TEM and BET were used to characterize the …X-ray luminescence of core-shell structured …X-ray diffraction results showed that the lutetium oxide cubic phase crystallizes in the silica matrix at 700 8C, and the crystallite size of Lu2O3:[email protected] films varies from 5 nm to 17 nm ...

  • Composites | SpringerLink

    Brecher C, Emonts M, Stimpfl J et al (2014) Production of customized hybrid fiber-reinforced thermoplastic composite components using laser-assisted tape placement. In: Denkena B (ed) New production technologies in aerospace industry. Lecture Notes in Production Engineering. Springer, Cham, Switzerland, pp 123–129.Recommended Books - Gordon Research InstituteCranton, Elmer, M.D., and Brecher, Arline. Bypassing Bypass. The New Technique of Chelation Therapy. (1984) Stein and Day, New York. (1990) Hampton Roads Publishing Company, Inc. ISBN 0-9624375-1-4. This well-written and well-referenced book on chelation is "must" reading for any doctor or patient seriously interested in understanding why ...

  • Preparation and Characterization of a New ...

    Europium-doped Lu2O3 nanocrystalline powders were prepared via a novel solution combustion route, with glycine as the fuel. The crystalline size and specific surface area of the combustion derived powders are strongly dependent on the glycine-to-nitrate ratio, which can control the combustion flame temperature. XRD, SEM, TEM and BET were used to characterize the …Synthesis and Luminescence Properties of ... - scientific YVO4:Eu3+ nanocrystals were synthesized using a sol-gel method which citric acid was used as complexing agent and ethylene glycol was used as coupler. In order to study the influence of heat treating temperature and time on structure and luminescence properties of YVO4:Eu3 nanocrystals, the dry gels were heated at 400 oC, 500 oC and 600 oC for 1 h, 600 o C for 3 h, …

  • Publications

    [Journal Article] Recast-Free Helical Drilling of Fused Silica Using SHG Picosecond Laser Pulses In: Journal of Laser Micro/Nanoengineering, 15 (2), 158-163, 2020 [DOI: 10.2961/jlmn.2020.02.2014 ] He, Chao (Corresponding author)Mesolithic Site Formation and Palaeoenvironment Along …2011-6-16 · The Mesolithic period represents a key stage in the human history of Sudan, but its complexity is not yet fully understood. Since the beginning of prehistoric research in this region, efforts were made to understand Mesolithic site formation processes and post-depositional disturbances. Responsibility for the destruction of most Mesolithic sites'' deposits rests mainly …

  • Analysis of wear of fused silica moulding using glassy ...

    2016-6-11 · Optical components made of fused silica are in great demand due to the material''s exceptional properties: a broad transmission range from 185 nm to 2.5 μm, low coefficient of thermal expansion, low thermal conductivity and high radiation resistance. For the production of complex optical components in medium and large quantities, the technology of precision glass …Laser Assisted Milling of Ti-6Al-4V ELI with the Analysis ...2015-7-8 · This study presents the experimental evaluation of laser assisted milling (LAML) of Ti-6AL-4V ELI (Ti-64), which is used in the orthopedic industry, by using localized preheating of the workpiece via laser irradiation. Improvements to the machinability of this material with LAML are assessed while considering the surface integrity. Suitable laser heating conditions as well as …

  • Synthesis and Luminescence Properties of ...

    YVO4:Eu3+ nanocrystals were synthesized using a sol-gel method which citric acid was used as complexing agent and ethylene glycol was used as coupler. In order to study the influence of heat treating temperature and time on structure and luminescence properties of YVO4:Eu3 nanocrystals, the dry gels were heated at 400 oC, 500 oC and 600 oC for 1 h, 600 o C for 3 h, …Luminescent perovskites: recent advances in theory and ...Luminescent perovskites: recent advances in theory and experiments. Zhen Song, Jing Zhao * and Quanlin Liu * Beijing Key Laboratory for New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science …

  • Bulk growth, structural, optical and mechanical properties ...

    2022-1-1 · The vibrational band frequencies rely on the nature, relative intensity, position and magnitude on the crystal structure .The compound was subjected to Fourier transform infrared spectroscopy (FT-IR) in the range 4000–400 cm −1.The observed fundamental modes of vibration are recorded and shown in Fig. 5.The band at 3329 cm −1 is assigned to the N-H asymmetric …Study on Tool-Path Generation for Ultra ... - Scientific In this study, a computer numerical control (CNC) programming software platform for ultra precision machining of optical surfaces was developed based on an MS Windows application framework and openGL. Using cylindrical coordinates, the tool path can be generated based on the polar angle, radius and a linear coordinate of the Z-axis, as well as cutting tool nose radius …

  • Luminescent perovskites: recent advances in theory and ...

    Luminescent perovskites: recent advances in theory and experiments. Zhen Song, Jing Zhao * and Quanlin Liu * Beijing Key Laboratory for New Energy Materials and Technologies, School of Materials Science and Engineering, University of Science …BSTJ Archive - Telephone Collectors2022-1-8 · Telephone Collectors International was incorporated under the laws of the state of Kansas on May 13, 1986. The goal of the organization is "to educate the public, as well as the members of the Corporation, regarding the history of telephony, the value of old telephones and related items, their collectability and preservation; to research telephone history and publish …

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