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An international program on Silk Road disaster Risk Reduction--a Belt and Road initiative (2016-2020)

Journal of Mountain Science 2018年第7期15卷 1383-1396页

作者： LEI Yu CUI Peng Amar deep REgMI Virginia MURRAY Alessandro PASUTO giacomo TITTI Muhammad SHAFIQUE tilak priyadarshana d.g. Key Laboratory of Mountain Hazards and Earth Surface Processes/Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China University of Chinese Academy of Sciences Bering 100049 China CAS Center for Excellence in Tibetan Plateau Earth Sciences Beijing 100101 China Public Health England London 133-155 England UNISdR Scientific and Technical Advisory group Geneva Switzerland Integrated Research on disaster Risk Scientific Committee Beijing 100094 China Research Institute for C-eo-Hydrological Protection National Research Council 4- 35127 Padova Italy National Center of excellence in geology University of Peshawar Peshawar 25130 Pakistan Internal Quality Assurance Unit &Center for International Affairs University ofRuhuna Matara Sri Lanka

Belt and Road Initiative(BRI) is a Chinese national strategy which calls for cooperative economic, political and cultural exchange at the global level along the ancient Silk Road. The overwhelming natural hazards located along the belt and road bring great challenges to the success of BRI. In this framework, a 5-year international program was launched to address issues related to hazards assessment and disaster risk reduction(dRR). The first workshop of this program was held in Beijing with international experts from over 15 countries. Risk conditions on Belt and Road Countries(BRCs) have been shared and science and technology advancements on dRR have been disseminated during the workshop. Under this program, six task forces have been setup to carry out collaborative research works and three prioritized study areas have been established. This workshop announced the launching of this program which involved partners from different countries including Pakistan, Nepal, Russia, Italy, United Kingdom, Sri Lanka and Tajikistan. The program adopted the objectives of Sendai Framework for disaster Risk Reduction 2015-2030 and United Nation Sustainable development goals 2030 and was implemented to assess disaster risk in BRCs and to propose suitable measures for disaster control which can be appropriate both for an individual country and for specific sites. This paper deals with the outcomes of the workshop and points out opportunities for the near future international cooperation on this matter.

关键词： Natural hazards Silk Road disaster risk reduction Belt and Road Initiative Sendai Framework International collaboration program

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Restoration of Koggala lagoon: Modelling approach in evaluating lagoon water budget and flow characteristics

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Journal of Environmental Sciences 2010年第6期22卷 813-819页

作者： gayan Lakendra gunaratne Norio Tanaka Prasanna Amarasekara tilak priyadarshana Jagath Manatunge Institute for Environmental Science and Technology Graduate School of Science and EngineeringSaitama University Faculty of Fisheries and Marine Sciences & Technology University of Ruhuna department of Civil Engineering Faculty of EngineeringUniversity of Moratuwa

groyne system modification is described related to restoration efforts to Koggaia lagoon, Sri *** large-scale unplanned sand removal at the lagoon mouth shifted the formation of sand bar towards the lagoon and made adverse effects on its ecosystem. After the removal of the natural sand bar, groyne system was constructed to avoid sand deposition in the lagoon and to protect the highway bridge （across the lagoon outlet channel） from the wave attack. The existing groyne system resulted the lagoon mouth being permanently open to sea which in turn led to many environmental problems. groyne system modification is proposed in this study to reduce the sea water *** budget and two-dimensional depth averaged hydrodynamic model were developed for understanding the hydrologic and flow characteristics of the lagoon. Numerical experiments was performed at lagoon mouth area for two cases：（1） existing condition and （2） proposed rubble mound.g.oyne system condition. Comparison of results was obtained for both cases to describe flow pattern at lagoon mouth. Results further showed, the width should be reduced to a maximum of 40 m. Proposed mouth width （40 m） pushed the salting factor towards 0.5 from 0.68. Salting factor reduction with the groyne modification may result a predominant influence of fresh water which may in turn lead lagoon to a fresh water ecosystem.

关键词： Koggala lagoon hydrodynamic modelling lagoon hydrology

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Effect of seasonal barrier layer on mixed-layer heat budget in the Bay of Bengal

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Acta Oceanologica Sinica 2022年第9期41卷 38-49页

作者： gayan Pathirana dongxiao Wang gengxin Chen M.K.Abeyratne tilak priyadarshana State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou510301China department of Oceanography and Marine geology Faculty of Fisheries and Marine Sciences&TechnologyUniversity of RuhunaMatara81000Sri Lanka Southern Marine Science and Engineering guangdong Laboratory(guangzhou) Guangzhou511458China School of Marine Sciences Sun Yat-sen UniversityGuangzhou519082China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou510301China department of Mathematics Faculty of ScienceUniversity of RuhunaMatara81000Sri Lanka department of Limnology and Water Technology Faculty of Fisheries and Marine Sciences&TechnologyUniversity of RuhunaMatara81000Sri Lanka

Time series measurements (2010–2017) from the Research Moored Array for African–Asian–Australian Monsoon Analysis and Prediction (RAMA) moorings at 15°N,90°E and 12°N,90°E are used to investigate the effect of the seasonal barrier layer (BL) on the mixed-layer heat budget in the Bay of Bengal (BoB).The mixed-layer temperature tendency (?T/?t) is primarily controlled by the net surface heat flux that remains in the mixed layer(Q’) from March to October,while both Q’and the vertical heat flux at the base of the mixed layer (Q_(h)),estimated as the residual of the mixed-layer heat budget,dominate during winter (November–February).An inverse relation is observed between the BL thickness and the mixed-layer temperature (MLT).Based on the estimations at the moorings,it is suggested that when the BL thickness is≥25 m,it exerts a considerable influence on ?T/?t through the modulation of Q_(h) (warming) in the *** cooling associated with Q_(h) is strongest when the BL thickness is≤10 m with the MLT exceeding 29°C,while the contribution from Q_(h) remains nearly zero when the BL thickness varies between 10 m and 25 *** inversion is evident in the BoB during winter when the BL thickness remains≥25 m with an average MLTg locations,with r>0.72 at the 95%significance level.

关键词： barrier layer vertical heat flux temperature inversion Bay of Bengal

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Antibiotics in two municipal sewage treatment plants in Sri Lanka:Occurrence,consumption and removal efficiency

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Emerging Contaminants 2019年第1期5卷 272-278页

作者： dilanka N.d.Samaraweera Xin Liu guangcai Zhong tilak priyadarshana Riffat Naseem Malik gan Zhang Mahdi Safaei Khorram Zewen Zhu Xianzhi Peng Zewen Zhu a Xianzhi Peng a a State Key Laboratory of Organic GeochemistryGuangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou510640China University of Chinese Academy of Sciences Beijing100049China Faculty of Fisheries and Marine Sciences&Technology University of RuhunaMataraSri Lanka department of Environmental Sciences Quaid-i-Azam UniversityIslamabadPakistan

Most of the monitoring data on the occurrence of antibiotics in sewage treatment plants(STPs)have been reported from Europe,North America and some countries in Northeast Asia,while very limited data can be found in Southeast Asian *** a pioneering research in Sri Lanka,we collected 24 h composite wastewater samples at the influent and effluent of two municipal STPs for consecutive 7 days to investigate occurrence,consumption and removal efficiency of seventeen *** STP was located in Colombo and Hikkaduwa,respectively,representing two kinds of communities(*** and tourists)in Sri *** targeted antibiotics were extracted by solid-phase extraction method and detected on an Agilent HPLCMSMS(1290/6470QQQ).Results illustrated that the majority of the antibiotics can be always detected from both STPs,except for chlorotetracycine(CTC),doxycycline(dOX)and florfenicol(FF).Fluoroquinolones(FQs)were detected at highest concentrations with ciprofloxacin(CIP)being the dominant *** of CIP in the influent samples were in the range of 433 e6010 ng/*** consumption of antibiotics was estimated on the basis of influent mass load and catchment population *** found difference in consumption patterns between the two served *** to local people in Colombo,tourists in Hikkaduwa appeared to take more antibiotics during the study period with the estimated daily dose of 0.25 g per 1000 ***,macrolides accounted for a larger portion than FQs in Hikkaduwa,with azithromycin(AZM)being the most prevalent antibacterial *** comparison with an official report by Medical Supplies division of Sri Lanka,we conjected that AZM was not commonly used among local people and it was mainly introduced by foreign *** for the removal efficiency,the activated sludge system of Colombo exhibited better elimination and more stable performance than the constructed wetland process of Hikkaduwa.

关键词： Antibiotics Sewage treatment plants(STPs) Activated sludge process Constructed wetland Consumption Removal efficiency Sri Lanka

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1992—2011年夏季南海西部离岸流区涡流相互作用特征

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海洋与湖沼 2017年第5期48卷 912-925页

作者：李晗王强黄科刘钦燕 tilak priyadarshana 管玉平王东晓中国科学院南海海洋研究所热带海洋环境国家重点实验室广州510301 中国科学院大学北京100049 Faculty of Fisheries and Marine Sciences & Technology University of Ruhuna

本文利用南海海洋再分析产品REdOS(Reanalysis dataset of the South China Sea)和风场资料CCMP(Cross-Calibrated,Multi-Platform),从能量学角度探讨了1992—2011年夏季(6—9月)越南离岸流区域涡-流相互作用特征,并通过能量收支方程诊断评估了风应力、压力梯度、正压不稳定以及平流的相对贡献。以越南离岸流的强度作为分类标准,对1992—2011年划分为正异常年、负异常年和正常年。结果表明,在正异常年,涡动能EKE(Eddy Kinetic Energy)和涡势能EPE(Eddy available Potential Energy)极大值主要分布在越南离岸流附近;在负异常年,EKE极大值向南北两侧分散,EPE极大值向北延伸;在正常年,EKE和EPE的极值空间分布介于正负异常之间。斜压不稳定是EPE年际变化的主要因素,越南离岸流影响周围海域的速度和密度分布,是斜压不稳定的主要原因。而影响EKE年际变化的因素较为复杂,压力做功是最主要的影响因素,风应力做功和平流做功次之,正压不稳定最小,其中正压不稳定依赖于流速大小和由风应力旋度扰动引起的上层水平流速剪切。

关键词：越南离岸流能量学分析涡-流相互作用年际变化

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2005-2009年、2011年和2013年南海东北部120°E断面秋季体积输运的年际变化

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海洋与湖沼 2016年第1期47卷 36-42页

作者：侯华千谢强陈更新何云开舒业强 tilak priyadarshana 姚景龙王东晓中国科学院南海海洋研究所热带海洋环境国家重点实验室广州510301 中国科学院大学北京100049 中国科学院三亚深海科学与工程研究所三亚572000 Faculty of Fisheries and Marine Sciences & Technology University of Ruhuna Matara Sri Lanka

基于2005年至2009年、2011年和2013年各年九月份南海开放航次获取的南海东北部120°E断面的水文观测资料,运用了地转流诊断和模态分解两种方法,研究了该断面流场结构和体积输运的年际变化特征。2005年、2006年、2007年和2013年流场呈显... 详细信息

基于2005年至2009年、2011年和2013年各年九月份南海开放航次获取的南海东北部120°E断面的水文观测资料,运用了地转流诊断和模态分解两种方法,研究了该断面流场结构和体积输运的年际变化特征。2005年、2006年、2007年和2013年流场呈显著斜压特征,断面上、下层流速方向相反;而2008、2009年和2011流场垂向变化不明显,呈现准正压结构。断面体积输运沿深度分布呈现三种方式:一致向西(2005年、2007年和2011年),上西下东(2008年和2013年)和上东下西(2006年和2009年)。断面净体积输运亦有显著年际变化,在2005年出现西向最大–11.2Sv,在2013年出现东向最大9.1Sv,而在2009年仅为西向-1.2Sv。模态分解表明,准正压结构的年份,流场主要被正压模态控制,但第一斜压模态亦不可忽略;而斜压结构的年份,流场由正压模态和第一斜压模态共同主导。

关键词：断面体积输运南海吕宋海峡 “三明治”结构正压模态斜压模态

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Impact of Organizational Restructuring on Financial Performance of Nepal Telecom

Impact of Organizational Restructuring on Financial Performa...

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作者： tilak Lamichhane 华南理工大学

学位级别：硕士

The recent data of Nepal Telecom Authority（NTA）,a telecom regulatory of Nepal shows that telephone penetration reached to 136 percent and the broadband penetration has just crossed the 56%.It indicates that the voice telephony market in Nepal is already saturated but the data service is yet to *** the state owned telco,Nepal Telecom is remaining number one on the basis of subscriber *** order to ensure the efficient operation of eldest telecom company of Nepal,Nepal Telecom has under gone the organizational restructuring in 2015 *** main aim of this research is to find the effects of NT restructuring on its financial *** study involves comparative study of pre-restructuring and postrestructuring financial status of the *** on this study,trend is traced and evaluate the restructuring and recommend ideas for the better performance of the company in Nepali telecom *** on the right time and taking relevant actions are highly important to hold the dominant position in this competitive *** study employs quantitative method of analysis through study of secondary data,quarterly reports,annual reports,internal management report,MIS reports,journals,articles,international trend and qualitative analysis based on face to face interviews with higher and mid-level managers of the *** study analyzes the financial performance of last seven years and try to explore the impact of restructuring on this performance to measure the effectiveness of the restructuring of *** is shown that the management motivation of organizational restructuring was making fast decisions with creating new business units with clear line of authority and improve efficiency by increasing the profit of the *** the help of relevant literature and the comparison of financial performance,mainly profitability of NT before and after restructuring,this study finds the positive effects of the organizational restructuring on th

关键词：尼泊尔组织结构调整电信运营商财务绩效

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孟加拉湾春季小型暖池对热带气旋的影响研究

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南京信息工程大学学报（自然科学版） 2020年第4期12卷 460-471页

作者： gayan Pathirana Kanchana Priyadarshani 王东晓陈更新 tilak priyadarshana 中国科学院南海海洋研究所热带海洋环境国家重点实验室广州510301 卢胡纳大学渔业与海洋科学技术学院马塔拉81000斯里兰卡

本文研究了2017年春季孟加拉湾小型暖池对热带气旋Maarutha(4月14-17日)以及热带气旋Mora(5月27-30日)的影响.利用卫星遥感和现场观测数据分析发现,尽管春季孟加拉湾热带气旋确实能引起海洋上层冷却效应,但是其冷却强度受到暖池强度的影... 详细信息

本文研究了2017年春季孟加拉湾小型暖池对热带气旋Maarutha(4月14-17日)以及热带气旋Mora(5月27-30日)的影响.利用卫星遥感和现场观测数据分析发现,尽管春季孟加拉湾热带气旋确实能引起海洋上层冷却效应,但是其冷却强度受到暖池强度的影响.本文进一步对比孟加拉湾小型暖池对两个热带气旋的响应情况,发现当春季小型暖池的温度大于31℃(热带气旋Mora期间),暖池效应能有效抑制海洋上层混合层的加深,降低热带气旋引起的潜热通量损失带来的冷却效应,并在一定程度上加强了热带气旋.

关键词：热带气旋春季小型暖池海表温度孟加拉湾

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双钢板-混凝土组合梁与板在偏心冲击下的动力响应研究

双钢板-混凝土组合梁与板在偏心冲击下的动力响应研究

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作者： tilak PRASAd SAH 哈尔滨工业大学

学位级别：硕士

双钢板-混凝土（SCS）组合结构在极端动力荷载（冲击和爆炸）作用下的性能越来越受到人们的关注。SCS组合结构与传统的钢筋混凝土结构相比,具有强度高、延性好、经济性好、易于预制、抗爆、抗冲击等优点。虽然人们对SCS组合结构进行了... 详细信息

双钢板-混凝土（SCS）组合结构在极端动力荷载（冲击和爆炸）作用下的性能越来越受到人们的关注。SCS组合结构与传统的钢筋混凝土结构相比,具有强度高、延性好、经济性好、易于预制、抗爆、抗冲击等优点。虽然人们对SCS组合结构进行了多种类型的研究,但对SCS组合梁的冲击性能研究有限。此外,以前的研究考虑了试件中心的冲击。在实际冲击事件中,结构上的意外或目标冲击载荷可能发生在其寿命期间的任何位置。因此,本研究探讨了螺栓连接双钢板-混凝土（SCS）组合梁和板在偏心冲击载荷下的结构性能。首先,对9根SCS组合梁进行了半球落锤冲击试验。研究了混凝土厚度、钢板厚度、上下钢板厚度比、冲击位置等因素对组合梁冲击响应的影响。试验中观察到试件的三种破坏形式,即弯曲、弯曲剪切和底板断裂。结果发现,螺栓连接件可有效阻止钢板和混凝土的分离,并且尽管在支撑附近受到冲击,SCS组合梁的结构完整性仍然保持。其次,建立了螺栓连接SCS组合梁在冲击载荷作用下的位移时程分析模型,并与试验结果进行了比较。预测的位移响应与试验位移-时间曲线吻合较好。此外,还比较了分析和试验的力-位移曲线。计算的力-位移结果相对保守。再次,采用LS-dYNA非线性显式程序建立了螺栓连接SCS组合梁的三维有限元模型。通过将有限元预测的破坏模式、峰值冲击力、最大和残余位移、冲击力和位移-时间历程与试验结果进行比较,验证了所建立有限元模型的精度。进行了参数研究,以探讨不同参数的影响,即连接件间距、混凝土强度、端板的存在、冲击位置、落锤质量和落锤高度。最后,利用LS-dYNA软件建立了SCS组合板的数值模型,研究了螺栓连接SCS组合板的偏心冲击行为。建立了螺栓连接SCS组合板的位移响应分析模型。

关键词：钢混凝土-钢三明治冲击载荷螺栓连接件应变率效应有限元模型

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Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

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Materials Reports(Energy) 2021年第2期1卷 90-98页

作者： Niranjala Fernando Jayashree Swaminathan Francisco Carlos Robles Hernandez gayan priyadarshana Chanaka Sandaruwan Wenli Yang Veranja Karunaratne Zixing Wang gehan AJAmaratunga Nilwala Kottegoda Ashokkumar Meiyazhagan Pulickel M.Ajayan department of design and Engineering Faculty of Science and TechnologyBournemouth UniversityDorsetBH125BBUK department of Materials Science&NanoEngineering Rice UniversityTexas77005USA department of Mechanical Engineering Technology University of HoustonHoustonTX77204USA Materials Science&Engineering Cullen College of EngineeringUniversity of HoustonHoustonTX77204USA department of Materials and Mechanical Technology Faculty of TechnologyUniversity of Sri JayewardenepuraPitipanaHomagamaSri Lanka Sri Lanka Institute of Nanotechnology PitipanaHomagamaSri Lanka department of Engineering University of CambridgeCambridgeCB21TNUK department of Chemistry Center for Advanced Materials ResearchUniversity of Sri JayewardenepuraGangodawilaNugegodaSri Lanka

Synthesis of ultrathin heterostructures has received much attention in the recent past due to their unique physical and chemical *** this work,we report the synthesis of Fe_(2)TiO_(5)–TiO_(2)heterostructures using a simple hydrothermal technique employing natural ilmenite as the *** arranged nanostructures with interconnected nano-petals of thickness around 50 nm are *** electrocatalytic properties of the synthesized Fe_(2)TiO_(5)–TiO_(2)heterostructures are enhanced following the cathodization *** observed enhancement in the synthesized materials’electrocatalytic property can be attributed to the defect-rich Fe_(2-x)TiO_(5-x)-TiO_(2-x)*** current approach and technique discussed in this work offer a simple method to synthesize a nanostructured heterostructure material and create defects for enhancing electrocatalytic activity.

关键词： Heterostructures Cathodization green catalyst 2d materials Hydrogen evolution Electrocatalysis Pseudobrookite

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