检索结果-南通市图书馆

Amur gold-Bearing Belt: geotectonic Position and Perspectives for Revealing New Deposits of Precious Metals

在线全文

学校读者我要写书评

暂无评论

global geology 1999年第2期4卷 179-186页

作者： khomich v.g. and Utkin v.P. (Far East geological Institute of FEB RAS vladivostok, 690022, Russia )

The ore-bearing belts, specialized for precious metals, are substantia ted to exist in the south Far East of Russia. The longest of which is the Amursk y gold-bearing belt extended from the Amur River mouth to the Ussuri River lowe r course and further to the southwest on China territory, probably, to the Sungar i River head. The fact that we have distinguished the Amursky and other gold-be a ring belts, make it possible to reevaluate the perspectives of the South Far Eas t of Russia and North-East China for new deposits of precious metals.

关键词： gold-bearing belt geotectonic position perspective Am ur

gold and tin of fluid-magmatic systems:causes of combination-separation of concentration elements

在线全文

学校读者我要写书评

暂无评论

global geology 2009年第3期12卷 134-144页

作者： I.I. Fatyanov v.g. khomich Far East geological Institute Far Eastern Branch of Russian Academy of Sciences

The aim of the investigation is to reveal possible causes of isolation and co-occurrence of the economically significant concentrations of gold and tin. Comparative analysis of the different-rank factors that influenced migration and concentration of these elements show that different geochemical properties of Au and Sn are responsible for isolation of their big concentrations giving rise to independent metallogenic provinces, zones, and ore nodes. These differences resulted in individualization of the element migration ways to the level of ore concentration within the fluid-magmatie columns. Three main factors influenced the Au and Sn migration activity： different patterns of metal connection with the meh structure, different relation with oxygen, and different relation with other strong oxidizers. By the moment when ore-bearing fluid became isolated from magmas, the metallogenic signature of the melts, contrasting in redox-potential, had already been defined that was confirmed by the fact that tin ores associate predominantly with the granitoids of ilmenite series and gold ores - with those of magnetite series. The fluid-magmatic systems with an intermediate degree of the melt reduction-oxidation may be considered the potential producers of the combined metal concentrations. In these cases, the combined con- centrating of tin and gold is plagued by an opposite direction of the oxidation-reduction reactions when their most common minerals are formed： the main migration form of Sn^＋2 must be oxidized （with cassiterite portioning） , and the forms of Au^＋ or Au^＋3 must be reduced （with native gold portioning）. Probably, because of this the combined tin and gold concentrations are dominated by one of the metals with a tendency of accumulation in different-stage mineral complexes.

关键词： gold tin migration concentrating fluid-magmatic systems redox-potential

growth of 4＂ diameter polycrystailine diamond wafers with high thermal conductivity by 915 MHz microwave plasma chemical vapor deposition

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2017年第3期19卷 93-97页

作者： A F POPOvICH v.g.RALCHENKO v K BALLA A K MALLIK A A khomich A P BOLSHAKOv D N SOvYK E E ASHKINAZI v Yu YUROv Institute of Radio Engineering and Electronics of Russian Academy of Sciences Fryazino 141190 Russia general Physics Institute of Russian Academy of Sciences Moscow 119991 Russia Harbin Institute of Technology Harbin 150001 People's Republic of China National Research Nuclear University MEPhI Moscow 115409 Russia Central glass and Ceramic Research Institute Kolkata 700 032 India

Polycrystalline diamond（PCD） films 100 mm in diameter are grown by 915 MHz microwave plasma chemical vapor deposition（MPCvD） at different process parameters,and their thermal conductivity（TC） is evaluated by a laser flash technique（LFT） in the temperature range of230-380 *** phase purity and quality of the films are assessed by micro-Raman spectroscopy based on the diamond Raman peak width and the amorphous carbon（a-C） presence in the *** and increasing dependencies for TC with temperature are found for high and low quality samples,***,as high as 1950 ± 230 W m-1 K-1 at room temperature,is measured for the most perfect material.A linear correlation between the TC at room temperature and the fraction of the diamond component in the Raman spectrum for the films is established.

关键词： thermal conductivity polycrystalline diamond microwave plasma chemical vapordeposition Raman spectroscopy

Deep-seated structure and gold content of Russia and China contiguous territories

在线全文

学校读者我要写书评

暂无评论

global geology 2010年第1期13卷 33-40页

作者： v.g. khomich YANg Yanchen N.g. Boriskina YAN Hongquan Far East geological Institute FEB of RAS Vladivostok 690022 Russia College of Earth Sciences Jilin University Changchun 130061 China

On the contiguous territories of southeastern Russia and northeastern China,many gold-bearing areas are conjugate in space with the gradient zones of the gravity *** gold-ore districts,defining in many respects the metallogenic signature of the region,are located on the joints of differently oriented gradient *** the best-studied districts,the Precambrian protrusions,staged distribution of magmatic chambers (by vertical) above the Mohorovicic discontinuity and restriction to the peripheral parts of intrusive massifs have been ***-type gold deposits in the studied ore-placer districts and nodes are often located on the areas of joint of the granitoid massifs and subvolcanic bodies with *** of areals of metasomatic alterations of rocks,placers,and ore occurrences of precious metals on such but poorly studied areas can serve as the basis for the revision and detailed forecasting-prospecting works to develop the mineral-raw material base of the region for precious metals.

关键词： gradient zone gravity field intrusive massif gold-bearing area gold content

Structural and electrical properties of carbon-ion-implanted ultrananocrystalline diamond films

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第9期27卷 426-433页

作者： Hui Xu Jian-Jun Liu Hai-Tao Ye D J Coathup A v khomich Xiao-Jun Hu College of Materials Science and Engineering Zhejiang University of Technology Hangzhou 310014 China Aston Institute of Materials Research School of Engineering and Applied Science Aston University Birmingham B4 7ET United Kingdom v. A. Kotelnikov Institute of Radio-Engineering and Electronics Russian Academy of Sciences Moscow 14l 190 Russia National Research Nuclear University MEPhI Moscow Russia

We investigate the structural and electrical properties of carbon-ion-implanted ultrananocrystalline diamond（UNCD）films. Impedance spectroscopy measurements show that the impedance of diamond grains is relatively stable, while that of grain boundaries（gBs）（Rb） significantly increases after the C~＋ implantation, and decreases with the increase in the annealing temperature（Ta） from 650℃ to 1000℃. This implies that the C~＋ implantation has a more significant impact on the conductivity of gBs. Conductive atomic force microscopy demonstrates that the number of conductive sites increases in gB regions at Ta above 900℃, owing to the formation of a nanographitic phase confirmed by high-resolution transmission electronic microscopy. visible-light Raman spectra show that resistive trans-polyacetylene oligomers desorb from gBs at Ta above 900℃, which leads to lower Rb of samples annealed at 900 and 1000℃. With the increase in Ta to 1000℃, diamond grains become smaller with longer gBs modified by a more ordered nanographitic phase, supplying more conductive sites and leading to a lower Rb.

关键词： ultrananocrystalline diamond C-ion implantation annealing electrical properties

甲烷浓度对CvD金刚石薄膜晶体学生长过程的影响

在线全文

学校读者我要写书评

暂无评论

无机材料学报 2007年第3期22卷 570-576页

作者：朱宏喜毛卫民冯惠平吕反修 vlasov I I Ralchenko v.g.khomich A v 北京科技大学材料学系 general Physics Institute Russia Academy of SciencesMoscow 119991 Russia Institute of Radio Engineering & Electronics Russia Academy of SciencesFryazino 141190 Russia

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CvD自支撑金刚石薄膜的宏观织构、微区晶界分布和表面形貌．研究了金刚石晶体{100}面和{111}面生长的晶体学过程．研究表明,{100}面通过吸附活性基... 详细信息

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CvD自支撑金刚石薄膜的宏观织构、微区晶界分布和表面形貌．研究了金刚石晶体{100}面和{111}面生长的晶体学过程．研究表明,{100}面通过吸附活性基团CH2 2-,而{111}面通过交替吸附活性基团CH3 -和CH3-后脱氢堆积碳原子．低甲烷浓度时,{111}面表面能低于{100}面,使{111}面生长略快于{100}面．甲烷浓度升高,动力学作用增强使{100}面生长明显快于{111}面,使金刚石薄膜产生{100}纤维织构;同时显露的{100}面平行于薄膜表面,竞争生长使位于晶体侧面的{111}面由于相互覆盖而减小,形成了不同于单晶体自由生长的薄膜表面形貌组织．

关键词：金刚石薄膜织构晶体生长表面形貌组织

Nitrogen-Doped Chemical vapour Deposited Diamond： a New Material for Room-Temperature Solid State Maser

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2007年第7期24卷 2088-2090页

作者： N. A. Poklonski N. M. Lapchuk A. v. khomich 吕反修唐伟忠 v. g. Ralchenko I. I. Wlasov M. v. Chukichev Sambuu Munkhtsetseg Department of Physics Belarusian State University Minsk 220030 Belarus v. A. Kotelnikov Institute of Radio Engineering and Electronics Russia Academy of Sciences Fryazino 141191 Russia School of Material Science and Engineering University of Science and Technology Beijing Beijing 100083 A. M. Prokhorov.g.neral Physics Institute Russia Academy of Sciences Moscow 119991 Russia Department of Physics M. V. Lomonosov Moscow State University Moscow 119899 Russia National University of Mongolia Ulaanbaatar 210646 Mongolia

Electron spin resonance （ESR） in polycrystalline diamond films grown by dc arc-jet and microwave plasma chemical vapour deposition is studied. The films with nitrogen impurity concentration up to 8 × 10^18 cm^-3 are also characterized by Raman, cathodoluminescence and optical absorption spectra. The ESR signal from P1 centre with g-factor of 2.0024 （nitrogen impurity atom occupying C site in diamond lattice） is found to exhibit an inversion with increasing the microwave power in an H102 resonator. The spin inversion effect could be of interest for further consideration of N-doped diamonds as a medium for masers operated at room temperature.

关键词： ELECTRON-SPIN RESONANCE SYNTHETIC DIAMOND SINgLE-CRYSTAL EPR SIgNAL FILMS CATHODOLUMINESCENCE DEFECTS CvD MORPHOLOgY ENERgY

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CvD金刚石薄膜孪晶形成的原子机理分析

物理学报 2007年第7期56卷 4049-4055页

作者：朱宏喜毛卫民冯惠平吕反修 I.I.vlasov v.g.Ralchenko A.v.khomich 北京科技大学材料学系北京100083 general Physics Institute Russia Academy of Sciences Institute of Radio Engineering & Electronics Russia Academy of Sciences

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CvD自支撑金刚石薄膜的宏观织构、晶界分布和表面形貌.研究了一阶孪晶在金刚石晶体{111}面生长的原子堆垛过程.结果表明,由于一阶孪晶〈111〉60°... 详细信息

采用X射线衍射技术、电子背散射衍射技术和扫描电镜分别观察了不同甲烷浓度条件下沉积的CvD自支撑金刚石薄膜的宏观织构、晶界分布和表面形貌.研究了一阶孪晶在金刚石晶体{111}面生长的原子堆垛过程.结果表明,由于一阶孪晶〈111〉60°的取向差关系以及{111}面的原子堆垛结构,使{111}面上容易借助碳原子的偏转沉积产生一阶孪晶.低甲烷浓度时,碳原子倾向于在表面能较低的{111}面沉积,为孪晶的形成提供了便利,且高频率孪晶使薄膜织构强度减弱.甲烷浓度升高使生长激活能较小的{001}面成为主要前沿生长面,因而只有〈001〉晶向平行薄膜法向的晶粒能够不断长大,因此孪晶形核概率明显减小.另外,在薄膜中发现二阶孪晶,并对二阶孪晶的形成进行了分析.

关键词：金刚石薄膜孪晶原子机理取向差

gold-Platinoid Mineralization of Metasomatically Altered Ultramafites in Precambrian Protrusions of Mamynsky geoblok

在线全文

学校读者我要写书评

暂无评论

global geology 2003年第2期8卷 160-165页

作者： v.g.khomich v.P.Molchanov N.g.Boriskina geological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 RussiaGeological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 RussiaGeological Institute of the Far Eastern Branch Russian Academy of Sciences Vladivostok 690022 Russia

On the contiguous territories of Russia and China, along the left and right banks of the Amur River (Heilongjiang Province of China, and Amur Oblast’ of Russia), several Precambrian protrusions (gonzhinsk, Mamynsk, Amurkhe, and Khumakhe) are known. On the Russian territory, along the setting and on the area of the protrusions, lode manifestations, precious-metal deposits, and gold-platinoid placers are known having the industrial importance. Ultramafites are metasomatically altered more likely by the action of the Late Paleozoic intrusions and produced by them hydrothermae, and are transformed into listvenites. It can be concluded that as one of the sources of precious metals in the placers were the aureoles of listvenitization. This is evidenced by the presence of talc (typomorphic mineral of apoultrabasites) inclusions together with Pt-, Pd- and Ir-bearing gold in the corrosive coatings of the primary platinoids. This conclusion requires the revision of the work strategy of prospecting the lode gold and PgE manifestations within the ore-placer node because apoultrabasites before were considered non-promising for precious metals.

关键词： ultramafites, gold-platinoid, mineralization, Precambrian, AmurRiver