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Microscopic observations indicate that amorphization of a-quartz begins with formation of crystallographically controlled planar defects and is followed by growth of amorphous silicon dioxide at these defect sites. Similar transformation microstructures are found in quartz upon quasihydrostatic and nonhydrostatic compression in a diamond …
This is known as the Gibbons's heterogenous model. His ideas were recently largely validated with experiments using in situ TEM light and heavy-ion irradiations [26,27] as well as via 3D ...
Хүний хөгжлийн индекс өндөр хэдий ч ядуурлын түвшин мөн өндөр байна Монгол улсын хүн ам тогтмол өсөж, 2018 оны байдлаар 3,238,479 хүрсэн ба үүнээс 49.2% нь эрэгтэй, 50.8% нь эмэгтэй байна (БХ, 2019). Хүн ...
Abstract. This paper presents results on the microstructure and physical properties of SiC amorphized by both ion and neutron irradiation. Specifically, 0.56 MeV Si ions have been implanted in single crystal 6H–SiC from ambient through >200°C and the critical threshold for amorphization was measured as a function of the irradiation …
The amorphous form of pharmaceutical materials represents the most energetic solid state of a material. It provides advantages in terms of dissolution rate and bioavailability. This review presents the methods of solid- -state amorphization described in literature (supercooling of liquids, milling, lyophilization, spray drying, dehydration of ...
Банкны салбарын тойм – 2022/q1. ; 18:17 ; ... идэвхжил муу хэвээр байвал манай улсын эдийн засаг намар гэхэд ихээхэн хүндрэлд орохоор байна. Гантай зуны намар ургац хүлээдэггүйтэй адил зүйл ...
Physica B 153 (1988) 93-135 North-Holland, Amsterdam AMORPHIZATION BY BALL MILLING. A REVIEW A.W. WEEBER and H. BAKKER Natuurkundig Laboratoriurn der Universiteit van Amsterdam, Valckenierstraat 65, NL-IOI8 XE Amsterdam, The Netherlands" Received 1 March 1988 A new method for the preparation of amorphous alloys is the …
The specific contact resistivity of Ni(Pt)Si silicide layers on Si active areas has been assessed using the transfer length method (TLM) for a broad range of pre-amorphization implantation conditions, including various implanted species and implantation energies as well as two different implantation processes (beam line ion implantation (BLII) and …
Low aqueous solubility of drug candidates is an ongoing challenge and pharmaceutical manufacturers pay close attention to amorphization (AMORP) technology to improve the solubility of drugs that dissolve poorly. Amorphous drug typically exhibits much higher apparent solubility than their crystalline form due to high energy state that …
Amorphization technology has been the subject of continuous attention in the pharmaceutical industry, as a means to enhance the solubility of poorly water-soluble drugs. Being in a high energy state, amorphous formulations generally display significantly increased apparent solubility as compared to their crystalline counterparts, which may …
Solid-state amorphization can occur in response of mechanical loading. • Not only pressure, but also deviatoric stress matter. • Stress-induced amorphization …
Банкны салбарын тойм, Судалгаа БАНКНЫ САЛБАРЫН ТОЙМ: 2022 оны 1 дүгээр улирлын гүйцэтгэл Sarangua Tumur on . ГАНТАЙ ЗУН АЙСУЙ. Банкны салбарын үзүүлэлт харьцангуй тогтвортой, өсөлттэй байлаа.
2015 он гэхэд НҮЭМ-ийн тусламж үйлчилгээг бүх нийтэд хүртээмжтэй болгох зорилтыг 2006 онд МХЗ-д нэмсэн байна (Canning & Schultz 2012). Дэлхийн улс орны тэргүүнүүд хөгжлийн шинэ
Elctrochemical water splitting is of vital significance for energy conversion and storage. Here the authors show an electrocatalyst based on amorphous ruthenium-tellurium porous nanorods which ...
Impressively, high-loading single-atom doped (over 10 atom %) In 2 O 3 NSs were obtained. Additionally, Cu/a-In 2 O 3 NSs exhibit an excellent ethanol yield (798.7 μmol g -1 h -1) with a high selectivity of 99.5% for the CO 2 photoreduction. This work offers a new approach to induce CE reactions in metal oxides under mild conditions and ...
АНУ-д гэхэд инфляцын түвшин 2021 онд 6.8%-д хүрсэн нь 1982 оноос хойших хамгийн өндөр үзүүлэлт болжээ. ... ХӨРӨНГИЙН ЗАХ ЗЭЭЛИЙН ТОЙМ 2024.03.11 - 03.15 | МОНГОЛБАНК БОДЛОГЫН ХҮҮГ 1%-ИАР БУУРУУЛЛАА ...
Abstract. Amorphous solid dispersion is a popular formulation approach for orally administered poorly water-soluble drugs, especially for BCS class II. But oral delivery could not be an automatic choice for some drugs with high first-pass metabolism susceptibility. In such cases, transdermal delivery is considered an alternative if the drug …
1. Introduction. The notion of "high entropy", which breaks through the restriction of the conventional alloying notion featured by one and rarely two major components, confers a sheer infinite space of element combinations enabled by incorporating several principal elements with equal or nearly equal molar ratios [1, 2].This novel and exciting multi …
In this work, we provide atomic-level insight into the crystalline-to-amorphous transformation and describe a mechanism that holistically connects the lattice oxygen activation, metal dissolution, and amorphization in SrIrO 3.We focus on SrIrO 3, the state-of-the-art OER electrocatalyst in acid (), to understand the origin of its high activity and …
Bridgmanite formation and amorphization in shocked meteorites constrain the pressure and temperature conditions during planetary impact. However, the effect of the bridgmanite grain size on its amorphization kinetics is still unclear. Here, the amorphization mechanism and kinetics of fine-grained polycrystalline bridgmanite were …
Analysis. It is postulated that the shock-induced amorphization in SiC is a synergy of longitudinal shock and deviatoric stresses. The passage of a strong shock wave plastically deforms the crystalline lattice and introduces anisotropic defects such as planar faults, which may harden the material following the HEL.
Using high-resolution electron microscopy, we investigated the initial stages of high-pressure-torsion-induced crystalline-to-amorphous transformation of TiNi. It is found that the deformation-induced amorphization initiated from dislocation core regions in the interior of grains and from grain boundaries. It is believed that both the energy stored in the …
Номын тойм: Дори идэр дүүдээ. Уншсан нэгэнд нь эргэн нэг сөхөж харахыг сануулахаар, уншаагүй нэгэнд нь цаг алдалгүй олж уншаарай гэж зөвлөхөөр залуучуудад зориулсан нэгэн номыг бид …
At high stresses beyond the Hugoniot elastic limit (HEL), boron carbide exhibits structural collapse through pressure-induced amorphization, which is observed in shock tests, 15 indentations, 16,17 and diamond-anvil cell experiments. 18 Evidence for amorphization is found in TEM images, 15,17 wherein amorphous islands have been …
Surface amorphization provides electrocatalysts with more active sites and flexibility. However, there is still a lack of experimental observations and mechanistic …
The SrIrO 3 amorphization is initiated by the lattice oxygen redox, a step that allows Sr 2+ to diffuse and O 2− to reorganize the SrIrO 3 structure. This activation …
Effects of ion beam irradiation of five members of the (Mg,Fe)2SiO4 olivine series, from synthetic pure fayalite (Fe2SiO4) to naturally occurring (Mg0.88Fe0.12)2SiO4, have been studied by in situ transmission electron microscopy (TEM). Under 1.5 MeV Kr+ ion room temperature irradiations, all of the samples have been amorphized. The critical …
Inset: Final pressure for each strain value. ( C and D) Snapshots of single-crystalline stishovite at t = 7.05 ps (C) and amorphized SiO 2 at t = 9.06 ps (D). Open in …
The process of amorphization can release the large deviatoric stresses developed at the intersections of defects (dislocations, stacking faults, and twins) or …
Abstract. To better understand the radiation response of zirconium carbide (ZrC), and in particular its excellent resistance to amorphization, we have used density functional theory methods to study the kinetics of point defects in ZrC. The migration barriers and recombination barriers of the simple point defects are calculated using the …
The amorphization of dc-Si via an intermediate dh-Si phase is a previously unknown pathway of solid-state amorphization. Silicon nanocrystals under shear stress go through an intermediate, diamond ...
Pressure-induced amorphization occurs when the metastable extension of the melting curve (dT m /dP) of a low-density crystal phase is intercepted during compression 10 (here T m is the melting ...
2022 оны тойм: Монгол дахь НҮБ-ын онцлох 10 үйл явдал 2022 оны арван хоёрдугаар сарын 22 Монгол дахь НҮБ-аас 2022 онд хэрэгжүүлсэн онцлох 10 үйл явдлыг нэрлэж байна.
By using high-energy ball miller, the amorphization of Se is studied. The crystalline Se with a purity of 99.999% is milled under the protection of flow Ar at a rate of 0.8 mL s−1. The mass ratio of ball to powder is 10. At room temperature, crystalline Se can be transformed into amorphous state after milling for 5 h.
In this work, by a time-dependent density-functional theory molecular-dynamics study, the physics underlying the optical excitation induced amorphization of Sc-Sb-Te is revealed, which goes back ...
An amorphization procedure further demonstrated the versatility and functionality of such an assembly. This procedure generated a novel film-on-graphene architecture of VG-IL-amZIF-67, in which the ZIF-67 lost the long-range order but still presented its signature molecular bonding in the short range.
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