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Methane fluxes and gas hydrates as well as seismic activity in the Okhotsk Sea

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Global Geology 2006年第2期9卷 161-163页

作者： Anatoly Obzhirov V.I.Il'ichev Pacific Oceanological Institute feb ras Vladivostok 690041Russia

The research works of methane concentration in water column of the Okhotsk Sea from 1984 to 2005 were *** some regularities of methane distribution in water column in the North-East Sakhalin slope of the Okhotsk Sea w... 详细信息

关键词： methane fluxes gas hydrate Okhotsk Sea

Variations of VLF radio signals and atmospherics during the deep earthquake with M = 8.2 occurred on 24 May 2013 near Kamchatka peninsula

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Natural Science 2014年第3期6卷 144-149页

作者： Viktor A. Mullayarov Gennady I. Druzhin Vyacheslav V. Argunov Larisa M. Abzaletdinova Aleksander N. Mel’nikov Institute of Cosmophysical Research and Radiowaves Propagation feb of ras Paratunka Russia Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy SB of ras Yakutsk Russia

To detect seismic disturbances in the lower ionosphere, we have used the signals of very-lowfrequency radio transmitters and natural radio signals—electromagnetic emission of lightning discharges—atmospherics. On earlier results of observation of atmospherics, it was obtained that the earthquake effects are displayed as weight-hourly amplitude increases on the day of event or within 3 days after them. Possible earthquake precursors are also manifested as one-day (within one to several hours) increases in the amplitude of atmospherics on average 5 - 12 days before the event. Analysis shows that seismic effects in the amplitude of atmospherics have been observed in the case of sufficiently strong (magnitude M > 4.5) and not very deep (usually no deeper than 50 km) earthquakes. The effects of the events of the earthquake with magnitude of 8.2 occurring in the Sea of Okhotsk on 24.05.13 not far from the Kamchatka Peninsula at a depth of 609 km considered in this work have shown that even deep earthquakes may have precursors in the form of disturbances in the lower ionosphere.

关键词： Earthquake Precursor Ionosphere Atmospherics Radio Signals

Some Properties of the Electromagnetic Radiation Emitted by the HV Transformers

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Energy and Power Engineering 2013年第4期5卷 1463-1467页

作者： Nikolay V. Kinsht Natalia N. Petrun’ko Peter V. Katz Tech. Diagnosis Lab. Institute of Automation & Control Processes feb ras Vladivostok Russia

One important way to control the technical condition of the high-voltage power equipment element is the monitoring and interpretation of electromagnetic radiation. Analysis of the spectra of emitted high-voltage equipment EMR provides information on which determines the intensity discharge processes occurring in insulation and other structural elements of high voltage equipment under the operating voltage without interfering with the process.

关键词： Partial Discharge Power Transformer Emitted Electromagnetic Radiation Technical Condition

Gold and Silver Minerals and Conditions of Their Formation at the Dorozhnoye Deposit (Magadan Region, Russia)

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Natural Resources 2014年第9期5卷 478-495页

作者： N. E. Savva G. А. Palyanova Е. Е. Kolova Institute of Geology and Mineralogy SB of RAS Novosibirsk Russia Novosibirsk State University Novosibirsk Russia North-Eastern Interdisciplinary Science Research Institute FEB of RAS Magadan Russia

This paper presents the brief geological and mineralogical characteristics of the Dorozhnoye mesothermal gold ore deposit (Magadan Region, Russia). The gold and silver minerals are represented by electrum (530‰ - 700‰), freibergite, stephanite, pyrargyrite and Bi-diaphorite. The homogeneous fluid inclusions enable one to determine that the quartz-molybdenite veins were formed at a temperature of 340°C to 140°C, and that the quartz-sulfide gold ore veins were formed at a temperature of 165°C to 125°C. It is assumed that the fluid had a mixed composition and evolved from K-chloride and K-carbonate to Na-chloride. The hypergenesis zone contains: high fineness gold (800‰ - 950‰), petrovskaite (AgAuS) and uytenbogaardtite (Ag3AuS2) associated with goethite and melanterite. The surface waters contain: Ca++ up to 293 mg/L, HCO3 up to 125 mg/L, SO4 up to 777 mg/L;рН is 5.8 to 7.2. Thermodynamic calculations have been conducted and Eh-pH diagrams have been built for the Au-Ag-S-H2O system at 25°C and 100°C (p = 1 bar) to reveal gold and silver stability fields. Au-Ag sulfides at the Dorozhnoye deposit are formed under oxidizing conditions and an acidic environment with dominating sulfates.

关键词： Dorozhnoye Deposit Au-Ag Minerals Genesis Eh-pH Diagrams

Method of Detection Abnormal Features in Ionosphere Critical Frequency Data on the Basis of Wavelet Transformation and Neural Networks Combination

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Journal of Software Engineering and Applications 2012年第12期5卷 181-187页

作者： O. V. Mandrikova Yu. A. Polozov V. V. Bogdanov E. A. Zhizhikina Institute of Cosmophysical Researches and Radio Wave Propagation feb ras Petropavlovsk-Kamchatskij Russia Institute of Cosmophysical Researches and Radio Wave Propagation feb ras Petropavlovsk-Kamchatskij Russia Kamchatka State Technical University Petropavlovsk-Kamchatskij Russia. Institute of Cosmophysical Researches and Radio Wave Propagation feb ras Petropavlovsk-Kamchatskij Russia Kamchatka State Technical University Petropavlovsk-Kamchatskij Russia Kamchatka State Technical University Petropavlovsk-Kamchatskij Russia

The research is focused on the development of automatic detection method of abnormal features, that occur in recorded time series of ionosphere critical frequency fOF2 during periods of high solar or seismic activity. The method is based on joint application of wavelet-transformation and neural networks. On the basis of wavelet transformation algorithms for the detection of features and estimation of their parameters were developed. Detection and analysis of characteristic components of time series are performed on the basis of joint application of wavelet transformation and neural networks. Method's approbation is performed on fOF2 data obtained at the observatory “Paratunka” (Paratunka settlement, Kamchatskiy Kray).

关键词： wavelet transformation neural networks critical frequency of ionosphere abnormalities earthquakes

The Composition and Structure of Reef Community at Tho Chu Island (South China Sea) after Ketsana Typhoon

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American Journal of Climate Change 2013年第4期2卷 284-291页

作者： Yuri Ya. Latypov A.V. Zhirmunsky Institute of Marine Biology Far East Branch of Russian Academy of Sciences (FEB RAS) Vladivostok Russia

Fringing the reefs of the island Tho Chu explored a quarter century later now reexamined in the Gulf of Thailand of the South China Sea. It was found that most of the reefs of the island were lost after the passage of typhoon “Ketsana” accompanied by heavy rains and strong sea waves higher than 2 meters in October 2009. Because of these natural phenomena, physical destruction of much of the coral communities occurred. Removal of terrigenous sediments from the islands in the water has led to increased sedimentation and loss of almost all the scleractinian family Acroporidae, the main building corals on the reefs of the Indo-Pacific. At present, in places where once there was full-reef community succession is restoring the reef due to the survivors of the typhoon colonies of coral genera Pocillopora and Acropora.

关键词： Typhoon Ketsana Destruction Reef Community Change Succession Vietnam

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

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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

Morphology of Gametes and Insemination in the Vestimentiferan <i>Riftia pachyptila</i>

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Open Journal of Marine Science 2012年第3期2卷 96-102页

作者： A. L. Drozdov S. V. Galkin A.V. Zhirmunsky Institute of Marine Biology feb ras ul. Palchevskogo Vladivostok Russia P.P. Shirshov Institute of Oceanology ras Nakhimovsky pr. Moscow Russia

Ultrastructure of gametes (sperm and eggs) of vestimentiferan tubeworms and external-internal insemination by means of spermatozeugmata in Riftia pachyptila were described. The spermatozoa of Riftia are threadlike, about 130 μm long, and have a diameter of about 0.7 μm, narrowing to 0.2 μm in the apical portion of the macrodome, and pointed at the end of the tail. Oocytes are produced by the ovaries at the first meiotic prophase stage. The early oocytes are small, hardly exceeding 10 μm in diameter, spherical cells with a poorly differentiated cytoplasm and large nuclei with a nucleolus. Completely formed oocytes reaching up to 130 μm in diameter leave the ovary, their germinal vesicle is unresorbed and has a nucleolus. They are coated by a yolk membrane of 1.2 μm. The eggs enter the oviduct, move along, and accumulate in its expanded anterior portion, the ovisack. The sperm is released in seawater as sperm packages, each having the shape of a torch. Then sperm moves to females and sperm packages at the posterior end of the oviduct surrounding of eggs. Inside the female tube, spermatozoa and, possibly, yet unsplit sperm packages, invade the oviducts through genital openings, where the unfertilized eggs are already present in the terminal portion of the eggsack.

关键词： Riftia Sperm Eggs Insemination Spermatozeugmata

A method to predict rockburst using temporal trend test and its application

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第3期16卷 909-923页

作者： Yarong Xue Zhenlei Li Dazhao Song Xueqiu He Honglei Wang Chao Zhou Jianqiang Chen Aleksei Sobolev School of Civil and Resources Engineering University of Science and Technology BeijingBeijing100083China Zhong-an Academy of Safety Engineering Beijing100083China China Energy Group Xinjiang Energy Co. LtdUrumqi830027China Khabarovsk Federal Research Center of the Far Eastern Branch of the Russian Academy of Sciences(KhFRC feb ras) 51 Turgenev StreetKhabarovsk680000Russia

Rockbursts have become a significant hazard in underground mining,underscoring the need for a robust early warning model to ensure safety *** study presents a novel approach for rockburst prediction,integrating the Mann-Kendall trend test(MKT)and multi-indices fusion to enable real-time and quantitative assessment of rockburst *** methodology employed in this study involves the development of a comprehensive precursory index library for *** MKT is then applied to analyze the real-time trend of each index,with adherence to rockburst characterization laws serving as the warning *** employing a confusion matrix,the warning effectiveness of each index is assessed,enabling index preference ***,the integrated rockburst hazard index Q is derived through data *** results demonstrate that the proposed model achieves a warning effectiveness of 0.563 for Q,surpassing the performance of any individual ***,the model’s adaptability and scalability are enhanced through periodic updates driven by actual field monitoring data,making it suitable for complex underground working *** providing an efficient and accurate basis for decision-making,the proposed model holds great potential for the prevention and control of *** offers a valuable tool for enhancing safety measures in underground mining operations.

关键词： Rockburst Microseismicity Early warning Mann-Kendall trend test Confusion matrix Multi-indices fusion