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Study of Iron Ore Processing Technology of Tamir Gol Deposit in Mongolia

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When Fleeing Matters:Differences in Escape Behaviours of Three Northeast Asian Anurans

Journal of Minerals and Materials Characterization and Engineering（矿物质和材料特性和工程） 2024年第3期 165页

作者： Mаngal Delgermaa Lkhagva Byambadorj ayurzana purevdorj

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Asian Herpetological Research 2024年第1期15卷 41-48页

作者： Yoonjung YI Zoljargal purevdorj Irina MASLOVA Yikweon JANG Amaël BORZÉE Laboratory of Animal Behaviour and Conservation College of Life SciencesNanjing Forestry UniversityNanjing 210037JiangsuChina Division of EcoScience and Department of Life Sciences Ewha Womans UniversitySeoul 03760Republic of Korea Department of Biology School of MathematicsMongolian State University of EducationUlaanbaatar 210648Mongolia Department of Forest and Environmental Resources Chungnam National UniversityDaejeon 34134Republic of Korea Federal Scientific Center of the East Asia Terrestrial Biodiversity Far Eastern Branch of Russian Academy of SciencesVladivostok 690022Russia

Prey species may have their own optimal escape strategy to balance predation risks and the energetic cost of *** species have an advantage when maintaining a short fleeing distance,while others may favour an earlier escape based on microhabitat,size,or body ***,we examined the escape behaviour of the three syntopic Northeast Asian anuran species:Mongolian toads(Strauchbufo raddei),Amur brown frogs(Rana amurensis),and Japanese treefrogs(Dryophytes japonicus)in Mongolia,Russia,China and DPR *** examined flight initiation distance(FID;the distance from a potential predator to the point when the individual starts to flee)and distance fled(DF;distance between flight initiation and flight termination points)of each species and the effects of microhabitat,sex,and body *** raddei and *** had a longer FID than ***,and *** also had a longer DF than *** trends remained similar when dividing FID and DF by a size proxy(snout-vent length)for all *** suggests that the treefrog *** used a strategy to stay immobile even when they were detected,and the toad *** reacted quicker and more sensitively to predators despite the presence of *** *** had a significantly longer FID than males suggesting that females are more sensitive to predation risk in this species,but body size was not significant for any of the three *** results indicate that the three sympatric species have different escaping strategies,likely related to differences in physiology and crypticity.

关键词： amphibian distance fled escape behaviour flight initiation distance predation

Understanding the oxidation chemistry of Ti_(3)C_(2)T_(x)(MXene)sheets and their catalytic performances

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Journal of Energy Chemistry 2024年第1期88卷 437-445,I0010页

作者： Suvdanchimeg Sunderiya Selengesuren Suragtkhuu Solongo purevdorj Tumentsereg Ochirkhuyag Munkhjargal Bat-Erdene Purevlkham Myagmarsereejid Ashley DSlattery Abdulaziz SRBati Joseph GShapter Dorj Odkhuu Sarangerel Davaasambuu Munkhbayar Batmunkh Department of Chemistry Division of Natural SciencesSchool of Arts and SciencesNational University of MongoliaUlaanbaatar 14200Mongolia Queensland Micro-and Nanotechnology Centre School of Environment and ScienceGriffith UniversityNathan campusBrisbaneQueensland 4111Australia Department of Physics Incheon National UniversityIncheon 22012Republic of Korea Australian Institute for Bioengineering and Nanotechnology The University of QueenslandSt LuciaBrisbaneQueensland 4072Australia Adelaide Microscopy The University of AdelaideAdelaideSouth Australia 5005Australia Centre for Organic Photonics&Electronics School of Chemistry and Molecular BiosciencesThe University of QueenslandSt LuciaBrisbaneQueensland 4072Australia

Transition metal carbides and nitrides(MXenes)nanosheets are attractive two-dimensional(2D)materials,but they suffer from oxidation/degradation issues during storage and/or applications due to their sensitivity to water and *** the great research progress,the exact oxidation kinetics of Ti_(3)C_(2)T_(x)(MXene)and their final products after oxidation are not fully ***,we systematically tracked the oxidation process of few-layer Ti_(3)C_(2)T_(x) nanosheets in an aqueous solution at room temperature over several *** also studied the oxidation effects on the electrocatalytic properties of Ti_(3)C_(2)T_(x) for hydrogen evolution reaction and found that the overpotential to achieve a current density of 10 mA cm^(-2)increases from 0.435 to 0.877 V after three weeks of degradation,followed by improvement to stabilized values of around 0.40 V after eight *** results suggest that severely oxidized MXene could be a promising candidate for designing efficient *** to our detailed experimental characterization and theoretical calculations,unlike previous studies,black titanium oxide is formed as the final product in addition to white Ti(IV)oxide and disordered carbons after the complete oxidation of Ti_(3)C_(2)T_(x).This work presents significant advancements in better understanding of 2D Ti_(3)C_(2)T_(x)(MXene)oxidation and enhances the prospects of this material for various applications.

关键词： 2D materials MXene Chemical degradation Catalysis Hydrogen evolution reaction

Effects of grazing and precipitation variability on vegetation dynamics in a Mongolian dry steppe

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Journal of Plant Ecology 2016年第5期9卷 508-519页

作者： Tserenpurev Bat-Oyun Masato Shinoda Yunxiang Cheng Yadamjav purevdorj Arid Land Research Center Tottori UniversityHamasakaTottori 680-0001Japan Information and Research Institute of Meteorology Hydrology and EnvironmentUlaanbaatar 15160Mongolia Graduate School of Environmental Studies Nagoya UniversityFuro-choChikusa-kuNagoya 464-8601Japan College of Pastoral Agriculture Science and Technology Lanzhou UniversityLanzhou 730020China Department of Food Science and Human Wellness Rakuno Gakuen UniversityEbetsuHokkaido 069-8501Japan

Aims Grazing and water availability are the primary drivers of vegetation dynamics in grazing-dominated regions of Mongolia with a semi-arid climate and frequent *** animal husbandry still plays a large part in the economy of Mongolia,but more variable precipitation regime and increase in livestock number have severely affected grassland ecosystems through overgrazing,leading to pasture *** study aimed to examine the effects of grazing exclusion,interannual variation of plant-available precipitation(PAP)and their interaction on the aboveground biomass(AGB)of each dominant species,the AGB of annual species and the total AGB in a Mongolian dry steppe,using long-term field *** To detect the effect of grazing on vegetation dynamics,vegetation surveys were conducted in a non-grazed exclosure zone and a fully grazed area outside the *** assessed the effects of grazing,PAP and their interaction on AGB parameters using a generalized linear model.A detrended correspondence analysis(DCA)was used to visualize the effects of grazing and PAP on the AGB of each *** Findings Grazing,PAP and their interaction had significant effects on *** effect of grazing on AGB was larger with higher precipitation and higher amounts of AGB(***)while AGB was strongly limited in drought years,which resulted in a smaller grazing *** current year PAP had the highest impact(r=0.88,P<0.01)on *** dominance of annual species was characterized by the amount of PAP in the current and preceding years:annuals dominated in wet years that followed consecutive dry *** DCA Axis 1 reflected the variation of AGB with interannual variation of PAP while the DCA Axis 2 differentiated the grazing *** DCA scatter diagram based on species score illustrated that Artemisia adamsii(an unpalatable herb)was clearly linked to grazing disturbance whereas palatable perennials such as Agropyron cristatum,Stipa krylovii and Cleistogenes

关键词： aboveground biomass annual species drought grazing plant-available precipitation

Minimal Electric Charge Detection Device for Perimeter Security Systems

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Journal of Electrical Engineering 2017年第6期5卷 329-334页

作者： Odgerel ayurzana Hiesik Kim Department of Electronics Mongolian University of Science and Technology Ulaanbaatar Mongolia Department of Electrical and Computer Engineering University of Seoul Seoul Korea

Passive types of perimeter security systems based on the detection technique of minimal electric charge are developed and applied in the test fields. The detection technique of electric charge is based on the triboelecWic effect. If two different types of materials are rubbed with each other, electric charges are generated at the friction surface. Simple telecommunication cable can be employed instead of the expensive sensor transducer for sensing the exterior intrusion. Minimal electric charges are generated between the cable conductors and isolator when little forces and impacts are applied to the cable. The developed charge detection device detects the generated minimal charges. The fixed long length of sensor cable is fastened on the various types of perimeter fences. It is a passive sensor fence based on the algorithm of electrostatic charge separation detecting the friction electromotive force. The guard alarm for perimeter fences i.s generated by signals on the local deformation of the fence and the sensor fastened to it at any unauthorized penetration by getting over the fence. Charge sensitivity of the developed experimental device is 1.6~ 10＂16 coulombs. This system is expected to be applied widely in more field areas.

关键词： Triboelectric effect sensor cable alarm.

Experimental Noise Analysis of Reed Switch Sensor Signal under Environmental Vibration

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Computer Technology and Application 2016年第2期7卷 96-102页

作者： Odgerel ayurzana Hiesik Kim Department of Computer Engineering Mongolian University of Science and Technology Ulaanbaatar Mongolia Department of Electrical and Computer Engineering University of Seoul Seoul Korea

The chattering noise problem of reed switch sensor signal for Automatic Meter Reading system was analyzed experimentally under various types of external vibrations and shocks. The external vibration level amplitude was measured with an accelerometer. To apply for water flow measurement devices, the reed switch sensors should keep high reliability. But the measured digital meter data are occurred difference or errors by chattering noise. The reed switch contains chattering error by itself at the force equivalent position. The vibrations such as passing vehicle near to the reed switch installed location causes chattering. In order to reduce chattering error, most system uses just software methods, for example using digital filter algorithm and also statistical calibration methods. However software approaches were implemented for reducing chattering error, there has still generated chattering error due to external mechanical vibrations and magnetic field. The chattering errors can be reduced by changing leaf spring structure using mechanical hysteresis characteristics.

关键词： Noise analysis accelerometer magnet vibration reed switch sensor chattering error.

Design of Energy Efficient ZigBee Module

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通讯和计算机（中英文版） 2016年第7期13卷 373-377页

作者： Odgerel ayurzana Sugir Tsagaanchuluun Department of Electronics Mongolian University of Science and Technology Ulaanbaatar Mongolia

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完善蒙古外国投资法的问题研究

完善蒙古外国投资法的问题研究

作者： ayurzana MUNKHBILEG（蒙和比里戈）东北大学

学位级别：硕士

蒙古现行外国投资法秉着为保障外国投资者在蒙古投资过程中其利益不受侵犯,私有财产得到保障,以及以提供完善的投资环境为主要理念。但是,蒙古外国投资法尚有不完善之处,即在外国投资领域、外国投资的监督与审批制度、外国投资企业的设... 详细信息

蒙古现行外国投资法秉着为保障外国投资者在蒙古投资过程中其利益不受侵犯,私有财产得到保障,以及以提供完善的投资环境为主要理念。但是,蒙古外国投资法尚有不完善之处,即在外国投资领域、外国投资的监督与审批制度、外国投资企业的设立、外国投资权益的保护、外国投资的优惠政策,以及外国投资争议的解决问题上,仍有不足之处。因此,有必要对外国投资法、投资环境,以及其它相关法律进行深入研究和分析。本文由绪论、正文、结论三部分组成。本论文可分为包括绪论在内的6个部分,各章的内容大致如下：第一章,绪论。大体介绍了选题的背景和研究意义、文献综述、以及研究方法和创新点。第二章,蒙古外国投资法的概述。简要介绍了外国投资与外国投资法的概念,分析了蒙古外国投资法的投资环境,该法的特点与结构,以及该法在蒙古引进外国直接投资的影响与作用。第三章,蒙古外国投资法存在的问题分析。从外国投资的待遇、市场准入和审批制度、优惠措施、法律保护和争端解决等方面,介绍了蒙古外国投资法存在的不足之处。结合实际投资环境,达到理论与实际相联系。第四章,中国外商投资企业法对蒙古外国投资法的启示。本章介绍了中国外国投资企业法在解决外国投资的待遇、市场准入和审批制度、优惠措施、法律保护和争端解决等方面的成功经验以及对蒙古外国投资法的可取之处。第五章,完善蒙古外国投资法的对策及建议。通过分析蒙古外国投资法存在的问题,借鉴中国外商投资企业法的成功经验,结合蒙古国情,提出可行性对策与建议。第六章,结论。最后一章总结了相关的内容以及不足的地方,阐述需要进一步研究蒙古外国投资法以及改善投资环境的具体构架。本文在已有的研究基础上,通过对蒙古外国投资法及投资环境进行研究、分析和归纳。结合实际市场环境,对蒙古外国投资法及投资环境的完善贡献自己的力量。

关键词：蒙古外国投资法中国外商投资企业法投资环境

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蒙古国对华煤炭出口贸易的问题与对策研究

蒙古国对华煤炭出口贸易的问题与对策研究

作者：萨仁（Sarangerel purevdorj）北京理工大学

学位级别：硕士

煤炭作为蒙古国第一大出口矿产品，其储量位居世界前列，开发潜力巨大。中国作为蒙古国第一贸易伙伴与投资国，同时也是世界上煤炭需求量最高的国家之一。随着中国工业化进程加速对煤等煤资源型产品的需求增加，为蒙古国对华煤炭出口贸... 详细信息

煤炭作为蒙古国第一大出口矿产品，其储量位居世界前列，开发潜力巨大。中国作为蒙古国第一贸易伙伴与投资国，同时也是世界上煤炭需求量最高的国家之一。随着中国工业化进程加速对煤等煤资源型产品的需求增加，为蒙古国对华煤炭出口贸易发展创造了良好的条件。本文首先对文章的研究背景及意义、国内外研究现状进行了介绍，其次阐述了蒙中矿业贸易与煤炭进出口贸易的现状，且进一步对蒙古国对华煤炭出口贸易中存在的问题及原因进行了分析，最终提出了扩大蒙古国对华煤炭出口贸易的对策。

关键词：蒙中贸易煤炭出口资源型产品经贸合作