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排序方式: 共有99条查询结果,搜索用时 31 毫秒
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2.
L. F. Grigor’eva S. A. Petrov O. Yu. Sinel’shchikova I. A. Drozdova V. V. Gusarov 《Glass Physics and Chemistry》2007,33(1):72-79
The mechanism of formation of barium titanate Ba2Ti9O20 in the BaO-TiO2 and BaO-SrO-TiO2 systems is investigated using initial mixtures prepared by three methods, namely, mechanical grinding of the initial reactants, coprecipitation from aqueous solutions of salts, and the sol-gel technique. It is established that, irrespective of the preparation procedure, the formation of Ba2Ti9O20 proceeds through the formation of the intermediate phases BaTi4O9 and BaTi5O11. The nature of the intermediate phases is determined by the homogeneity and dispersion of the initial mixture, as well as by the stability of the intermediate phase. The most optimum conditions for the synthesis of Ba2Ti9O20 are provided by the formation of BaTi5O11 as an intermediate phase upon heat treatment of the coprecipitation products in the nanocrystalline state. The metastability and structural defects in the BaTi5O11 intermediate phase encourage a decrease in the temperature of the final heat treatment by 100–150°C in the course of the preparation of Ba2Ti9O20 single-phase ceramics. 相似文献
3.
Polina Drozdova Alexandra Saranchina Ekaterina Madyarova Anton Gurkov Maxim Timofeyev 《International journal of molecular sciences》2022,23(18)
Ancient lakes are known speciation hotspots. One of the most speciose groups in the ancient Lake Baikal are gammaroid amphipods (Crustacea: Amphipoda: Gammaroidea). There are over 350 morphological species and subspecies of amphipods in Baikal, but the extent of cryptic variation is still unclear. One of the most common species in the littoral zone of the lake, Eulimnogammarus verrucosus (Gerstfeldt, 1858), was recently found to comprise at least three (pseudo)cryptic species based on molecular data. Here, we further explored these species by analyzing their mitogenome-based phylogeny, genome sizes with flow cytometry, and their reproductive compatibility. We found divergent times of millions of years and different genome sizes in the three species (6.1, 6.9 and 8 pg), further confirming their genetic separation. Experimental crossing of the western and southern species, which are morphologically indistinguishable and have adjacent ranges, showed their separation with a post-zygotic reproductive barrier, as hybrid embryos stopped developing roughly at the onset of gastrulation. Thus, the previously applied barcoding approach effectively indicated the separate biological species within E. verrucosus. These results provide new data for investigating genome evolution and highlight the need for precise tracking of the sample origin in any studies in this morphospecies. 相似文献
4.
当前俄罗斯正在进行立法改革以实现治理体系现代化,其中改革的重点是国家管理体系中的劳动保护、工业安全和突发事件的应急处理。过去的立法体系侧重于对受伤员工提供健康补偿和医疗救护,而新的立法体系则以预防为主,以期通过建立完善的风险管理机制和运行规则,提高安全生产水平、普及安全文化教育,保障员工的生命安全。新标准强调企业必须进行职业风险评估,并将职业风险评估纳入企业工作管理体系。论文以采金业为例,选取伊尔库茨克州波戴波区金矿露天采场为研究案例,探讨了现代化职业风险评估的方法,明确了职业风险评估首先要进行危害鉴别,编制了风险源管理档案清单。采用实测员工风险因素的“记分法”和数学模拟“矩阵法”完成了伊尔库茨克州波戴波区金矿露天采场主要职业的风险评估。研究表明: 在钻井爆破作业场所,由碎石的喷射、粉尘的排放和噪声效应引起的危险为不可接受风险,通过实施安全生产制度(即遵守安全标准和技术要求、为工人提供防护装备),可将高风险和不可接受风险化解为可接受风险;阐述了高风险职业,编制了风险手册,提出了改善工作条件的首要措施是消除影响爆破手和钻机操作员的有害因素,并为员工提供能更有效预防噪音和振动的个人防护用品。 相似文献
5.
A. M. Popov M. O. Kozhnov T. A. Labutin S. M. Zaytsev A. N. Drozdova N. A. Mityurev 《Technical Physics Letters》2013,39(1):81-83
The possibility of quantitative detection of trace zinc levels in soils per single laser pulse using laser-induced breakdown spectroscopy is shown. The development of laser plasma and the signal-to-noise ratio are studied when evaporating soils by the second (532 nm) and the third (355 nm) harmonics of an Nd:YAG pulse laser. The use of the third harmonics permits one to reach the zinc detection limit (18 ppm) below Occupational Exposure Limits (OEL) in soil (150 ppm) and below the mean abundance in the earth’s crust of zinc (83 ppm). This allows the use of the suggested technique for the rapid determination of soil pollution with zinc and searching for geochemical anomalies. 相似文献
6.
N. A. Bulienkov E. A. Zheligovskaya O. P. Chernogorova E. I. Drozdova I. N. Ushakova E. A. Ekimov 《Russian Metallurgy (Metally)》2018,2018(1):35-41
A composite material (CM) reinforced by diamond particles is fabricated from a mixture of cobalt and 10 wt % C60 powders at a pressure of 8 GPa and a temperature of 1200–1300°C, which is close to the melting temperature of the metastable Co–C eutectic. The results of X-ray diffraction, Raman spectroscopy, and electron-probe microanalysis demonstrate that the CM consists of diamond and the Co3C carbide. Diamond crystals are shown to grow as plates parallel to a {100} plane according to the mechanism of nonequilibrium normal growth during liquid-phase CM synthesis. The diamond particles have a hardness of 82 GPa at an elastic recovery of 95%. The structure of the synthesized cobalt-based CM with diamond inclusions ensures its ultrahigh wear resistance and antifriction properties. 相似文献
7.
V. V. Zabrodskiy P. N. Aruev V. P. Belik B. Ya. Ber D. Yu. Kazantsev M. V. Drozdova N. V. Zabrodskaya M. S. Lazeeva A. D. Nikolenko V. L. Sukhanov V. V. Filimonov E. V. Sherstnev 《Semiconductors》2013,47(2):213-216
The spatial homogeneity of the photoresponse is studied for silicon photodiodes based on p-n and n-p junctions a year after their irradiation at a wavelength of 121.6 nm and those based on n-p junctions four years after their irradiation with soft X-rays. It is demonstrated that silicon photodiodes based on p-n junctions exhibit a photoresponse recovery effect on being irradiated at a wavelength of 121.6 nm. No recovery effect is observed for silicon photodiodes based on n-p structures. 相似文献
8.
E. N. Korytkova A. V. Maslov L. N. Pivovarova I. A. Drozdova V. V. Gusarov 《Glass Physics and Chemistry》2004,30(1):51-55
The formation of nanotubes of magnesium hydrosilicate Mg3Si2O5(OH)4 with a chrysotile structure is investigated. It is found that the nanotubes of magnesium hydrosilicate Mg3Si2O5(OH)4 are formed through different mechanisms depending on the initial state of reactants, the composition of the hydrothermal solution, and temperature. It is shown that the rate of formation of nanotubes is determined by the stability of intermediate compounds, the chemical composition of the reaction mixture, and the synthesis temperature. 相似文献
9.
Polycrystalline nanofilms of Dy2O3 and CdO are prepared by hydropyrolysis from aqueous solutions of dysprosium and cadmium nitrate salts. The surface morphology of the films and their polycrystalline structure are investigated by X-ray diffraction and electron microscopy. The synthesis of powders is performed by thermolysis of aqueous solutions of cadmium and dysprosium nitrates. The sequence of formation and crystallization of oxide phases of CdO and Dy2O3 is ascertained from the X-ray powder diffraction data. The temperature dependence of the electrical resistance of the films obtained is studied in air and argon atmosphere. 相似文献
10.
AV Vatazin AI Lobakov RS Tishenina IV Krivtsova ZR Karichev ME Vishnevski? IuV Vasin GA Drozdova 《Canadian Metallurgical Quarterly》1997,(3):45-49
Small-flow membranous oxygenation of the blood was used in 45 patients with peritonitis in the multiple organ failure phase. In ten cases blood oxygenation was combined with hemofiltration. MOCT 19-03 (Kvant Research and Production Unit) and Gambro FH hemofilters (Sweden) were employed. Combination of small-flow membranous oxygenation of the blood combined with hemofiltration appreciably improved the oxygen-transporting function of the blood in adult patients with the respiratory distress syndrome, which was due to mutual potentiation of the two methods' effects. Small-flow membraneous oxygenation alone improved cellular immunity and decreased the laboratory manifestations of endogenous intoxication due to biotransformation of toxic products. 相似文献