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| 1 | Microstructure and Mechanical Properties of Friction Stir Lap Welded Aluminum Alloy AA2014显示文摘Friction stir lap welds were produced in 3 mm thick Alclad sheets of Al alloy 2014-T4 using two different tools (with triangular and threaded taper cylindrical pins). The effects of tool geometry on weld microstructure, lap-shear performance and failure mode were investigated. The pin profile was found to significantly influence the hook geometry, which in turn strongly influenced the joint strength and the failure mode. Welds produced in alloy 2014-T4 Alclad sheets by using triangular and threaded taper cylindrical tools exhibited an average lap-shear failure load of 16.5 and 19.5 kN, respectively, while the average failure load for standard riveted joints was only 3.4 kN. Welds produced in alloy 2014-T6 Alclad sheets and in alloy 2014-T4 bare sheets (i.e., no Alclad) were comparatively evaluated with those produced in alloy 2014-T4 Alclad sheets. While the welds made (with threaded taper cylindrical tool) in T6 and T4 conditions showed very similar lap-shear failure loads, the joint efficiency of the welds made in T6 condition (43%) was considerably lower (because of the higher base material strength) than those made in T4 condition (51%). The Alclad layers were found to present no special problems in friction stir lap welding. Welds made with triangular tool in alloy 2014-T4 Alclad and bare sheets showed very similar lap-shear failure loads. The present work provides some useful insights into the use of friction stir welding for joining Al alloys in lap configuration. | S. Babu G.D. Janaki Ram P.V. Venkitakrishnan G. Madhusudhan Reddy K. Prasad Rao | 2012 | Journal of Materials Science & Technology2012，28，5： | 8 |
| 2 | Low temperature friction stir welding of P91 steel显示文摘Bead-on-plate friction stir welds were made on P91 alloy with low and high rotational speeds(100 and 1000 RPM) to study their effects on weld microstructural changes and impression creep behavior. Temperatures experienced by the stir zone were recorded at the weld tool tip. Different zones of welds were characterized for their microstructural changes, hardness and creep behavior(by impression creep tests). The results were compared with submerged arc fusion weld. Studies revealed that the stir zone temperature with 100 RPM was well below A_(c1) temperature of P91 steel while it was above A_(c3) with 1000 RPM. The results suggest that the microstructural degradation in P91 welds can be controlled by low temperature friction stir welding technique. | Prasad Rao KALVALA Javed AKRAM Mano MISRA Damodaram RAMACHANDRAN Janaki Ram GABBITA | 2016 | Defence Technology(防务技术)2016，12，4： | 4 |
| 3 | Implications of tree species–environment relationships for the responsiveness of Himalayan krummholz treelines to climate change显示文摘Climate warming is expected to advance treelines to higher elevations. However, empirical studies in diverse mountain ranges give evidence of both advancing alpine treelines as well as rather insignificant responses. In this context, we aim at investigating the sensitivity and responsiveness of the near-natural treeline ecotone in Rolwaling Himal, Nepal, to climate warming. We analysed population densities of tree species along the treeline ecotone from closed forest stands via the krummholz belt to alpine dwarf shrub heaths(3700-4200 m) at 50 plots in 2013 and 2014. We quantified species-environment relationships, i.e. the change ofenvironmental conditions(e.g., nutrient and thermal deficits, plant interactions) across the ecotone by means of redundancy analyses, variation partitioning and distance-based Moran's eigenvector maps. In particular, we focus on explaining the high competitiveness of Rhododendron campanulatum forming a dense krummholz belt and on the implications for the responsiveness of Himalayan krummholz treelines to climate change. Results indicate that treeline trees in the ecotone show species-specific responses to the influence of environmental parameters, and that juvenile and adult tree responses are modulated by environmental constraints in differing intensity. Moreover, the species-environment relationships suggest that the investigated krummholz belt will largely prevent theupward migration of other tree species and thus constrain the future response of Himalayan krummholz treelines to climate warming. | Niels SCHWAB Udo SCHICKHOFF Birgit BURZLE Michael MULLER Jurgen BOHNER Ram Prasad CHAUDHARY Thomas SCHOLTEN Jens OLDELAND | 2017 | Journal of Mountain Science2017，14，3： | 3 |
| 4 | Application of hopcalite catalyst for controlling carbon monoxide emission at cold-start emission conditions显示文摘Carbon monoxide(CO) is a poisonous gas particularly to all leaving being present in the atmosphere.An estimate has shown that the vehicular exhaust contributes the largest source of CO pollution in developed countries.Due to the exponentially increasing number of automobile vehicles on roads,CO concentrations have reached an alarming level in urban areas.To control this vehicular exhaust pollution,the end-of-pipe-technology using catalytic converters is recommended.The catalysts operating efficiently in a catalytic converter are a challenging class of materials for applications in cold start of engines to maintain indoor air quality.In the cold start period,the catalytic converter was entirely inactive,because the catalytic converter had not been warmed up.The cold start phase is also depending upon the characteristics of vehicles and property of catalysts.The increasing cost of noble metals with the increasing number of vehicles motivates the investigation of material concepts to reduce the precious metal content in automotive catalysts or to find a substitute for noble metals.Hopcalite(CuMnOx) catalyst could work very well at the low temperature;thus,it can overcome the problem of cold-start emissions if used in a catalytic converter.Further,low cost,easy availability and advanced synthesis methods with stabilizer,promoter,etc.,advocates for the use of hopcalite as an auto exhaust purification catalyst.Although there are numerous research articles present on this topic until now,no review has been presented for demanding this issue.So there is a space in this area,and it has been made an attempt to seal this hole and progress the future scope for hopcalite catalyst for purification of exhaust gases by this review. | Subhashish Dey Ganesh Chandra Dhal Devendra Mohan Ram Prasad | 2019 | Journal of Traffic and Transportation Engineering(English Edition)2019，6，5： | 3 |
| 5 | Distribution Pattern of Vascular Plant Species of Mountains in Nepal and their Fate Against Global Warming显示文摘This study aims to find the altitudinal distribution pattern of vascular plant species reported from high mountain of Nepal(Manang) along the whole Himalayan elevation gradient, and evaluate their fate against climate change. Data was gathered from multiple sources, field investigations, literatures, and herbarium specimens. Altogether, 303 vascular plant species were reported from Manang. We used a published data to calculate distribution range of each species by interpolating between its upper and lower elevation limits. The relationship between elevation and species richness is elucidated by generalized linear model. The consequence of global warming upon Manang's vascular plant species was estimated based on projected temperature change for next century and adiabatic lapse rate along the elevation gradient of the Himalayas. The vascular plant species richness has a unimodel relationship with elevation along the whole elevation gradient of Nepal as well as in three biogeographical regions of Nepal. Vascular plants of Manang are found distributed from low land Terai to high alpine regions of Nepal and their elevation distribution range varies from 200 to 4700 m. Out of 303 vascular plants of Manang, only seven species might be affected if temperature increase by 1.5°C, whereas at least 70 species will be affected with 5°C temperature increased. However, the majority of species(233 species) have wider distribution range(> 1000 m) and more than 5°C temperature tolerance range, thus they are likely to be less affected from global warming by the end of 21 st century. | Suresh Chandra SUBEDI Khem Raj BHATTARAI Ram Prasad CHAUUDHARY | 2015 | Journal of Mountain Science2015，12，6： | 3 |
| 6 | Ethanol steam reforming study over ZSM-5 supported cobalt versus nickel catalyst for renewable hydrogen generation显示文摘The renewable hydrogen generation through ethanol steam reforming is one of the anticipated areas for sustainable hydrogen generation. To elucidate the role of Ni and Co with ZSM-5 support, catalysts were prepared by wet impregnation method and ethanol steam reforming(ESR) was performed. The catalysts were characterized by HR-XRD, ATR–FTIR, HR-SEM, TEM with SAED, EDAX, surface area analyzer and TPR. It had shown complete ethanol conversion at 773 K, but the selectivity in hydrogen generation was found higher for 10% Ni/ZSM-5 catalyst as compared to 10% Co/ZSM-5. The 10% Ni/ZSM-5 catalyst has about 72% hydrogen selectivity at temperature 873 K. It indicates that Ni is a more sustainable catalyst as compared to Co with ZSM-5 support for ESR. The C_2H_4 was found major undesirable products up to 823 K temperature. Nevertheless, the 10% Ni/ZSM-5 catalyst had shown its stability for high temperature(873 K) ESR performance. | Ashutosh Kumar Ram Prasad Yogesh Chandra Sharma | 2019 | Chinese Journal of Chemical Engineering2019，27，3： | 2 |
| 7 | 针对稳定和不稳定二阶时滞过程的IMC-PID控制器的性能改进设计(英文)显示文摘针对不稳定二阶时滞系统,提出了一种具有逆响应(RHP零)特性的IMC-PID控制器。通过Ms和λ图计算合适的调优参数λ,使性能和鲁棒性之间达到平衡。从文献中选取了六种不同形式的过程模型,说明了该方法的适用性。通过ITAE和总变差TV计算控制器的性能,并与最近发布的调优规则进行比较。通过使用设置点加权参数来消除不必要的超调。通过对各模型参数进行摄动,验证了控制器的鲁棒性。闭环控制结果表明,所设计的控制器在模型不确定性条件下具有较强的鲁棒性。与其他最近报道的方法相比,该方法具有更好的闭环响应。 | Munna KUMAR Durga PRASAD Ram Sharan SINGH | 2020 | Journal of Central South University2020，27，1： | 2 |
| 8 | Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds 显示文摘 | JANAKI RAM G D VENUGOPAL A PRASAD K | 2005 | Journal of Material Processing Technology2005，167，： | 1 |
| 9 | Aberrations in folate metabolic pathway and altered susceptibility to autism显示文摘 | Naushad Shaik Mohammad Jamal Md Nurul Jain Krishna Prasad Chintakindi Ram Prakash Singh Usha Naik Radha Rama Devi Akella | 2009 | Psychiatric Genetics2009，，4： | 1 |
| 10 | Mechanism of tertbutylhydroperoxide induced cytotoxicity in U-937 macrophages by alteration of mitochondrial function and generation of ROS显示文摘 | KANUPRIYA D PRASAD D SAI RAM M | 2007 | Toxieol in Vitro2007，21，： | 1 |
| 11 | Mechanical Milling: a Top Down Approach for the Synthesis of Nanomaterials and Nanocomposites显示文摘 | Prasad Yadav Thakur Manohar Yadav Ram Pratap Singh Dinesh | 2012 | Nanoscience and Nanotechnology2012，，3： | 1 |
| 12 | Microstructure and tensile properties of Inconel 718 pulsed Nd-YAG laser welds显示文摘 | Janaki Ram G D Venugopal A Prasad K | 2005 | Journal of Material Processing Techology2005，167，： | 1 |
| 13 | Optimal array factor radiation pattern synthesis for linear antenna array using cat swarm optimization: validation by an electromagnetic simulator显示文摘本研究进行了微带贴片天线线性阵列的优化设计。通过猫群算法(Cat swarm optimization,CSO)优化天线阵列辐射方向图的各控制参数。通过优化每个单元的激励电流权重和阵元间隙获得各向同性天线单元阵列的最佳辐射方向图。以12、16和20单元的天线阵列为例,运用MATLAB进行阵列优化设计,采用CST-MWS对设计结果进行仿真验证。由仿真结果可见,CSO能给出微带贴片天线线性阵列的最优设计。 | Gopi RAM Durbadal MANDAL Sakti Prasad GHOSHAL Rajib KAR | 2017 | Frontiers of Information Technology & Electronic Engineering2017，18，4： | 1 |
| 14 | Control of laves phase in incol718 GTA welds with current pulsing显示文摘 | Janaki Ram G D Venugopal Reddy A Prasad Rao K | 2004 | Science and Technology of Welding and Joining2004，9，5： | 1 |
| 15 | Mierostrueture and tensile properties of Ineonel 718 pulsed Nd-YAG laser welds显示文摘 | Janaki Ram G D Venugopal Reddy A Prasad Rao K | 2005 | Journal of Materials Processing Technology2005，167，： | 1 |
| 16 | Triglycerides-based diesel fuels 显示文摘 | Anjana Srivastava Ram Prasad | 2000 | Renewable and Sustainable Reviews2000，4，： | 1 |
| 17 | Spatial B-jump at Sudden Channel Enlargements with Abrupt Drop显示文摘 | Ram K V S Prasad R | 1998 | Journal of Hydraulic Engineering1998，124，6： | 1 |
| 18 | Grape seed proanthocyanidins inhibit migration potential of pancreatic cancer cells by promoting mesenchymal-to-epithelial transition and targeting NF-lcB显示文摘 | RAM PRASAD SANTOSH K KATIYAR | 2013 | Cancer Letters2013，334，1： | 1 |
| 19 | Improvement in corrosion resistance of friction stir welded aluminum alloys with micro arc oxidation coatings显示文摘 | Prasad Rao K Janaki Ram G D Stucker B E | 2008 | Scripta Mater2008，58，： | 1 |
| 20 | Effect of the vesicular-arbuscular mycorrhizal(VAM)fungus Glomus fasciculatum on the essential oil yield related character and nutrient acquisition in the crops of different cukivars of menthol mint(Mentha arvensis)under field conditions显示文摘 | Gupta M L Prasad A Ram M | 2002 | Bioresource Technology2002，81，1： | 1 |
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