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- 저자 : Amar, Nechnech (검색결과 285 건)
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Amar ul Hassan Khawaja,Mirza Jhanzaib,Muhammad Munawar 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.6
The execution of sustainable manufacturing methods to make machining processes more eco-friendly is a difficult task that has attracted significant attention from the industrial area for a long time. As one of the leading manufacturing processes, machining can have a profound impact on the environment, society, and financial aspects. In a specific scenario, recognizing reasonable machining conditions to supply cutting fluids utilizing eco-friendly methods is at present a significant focal point of academic and industrial sector research. This study is to investigate the optimal operational parameters such as speed, feed rate, and cutting depth during high-speed machining of 15CDV6 HSLA steel under near-dry (green machining) and flood lubrication using response surface methodology and an artificial neural network that leads to better performance measures like tool-chip interface temperature, specific energy, yield strength, and percentage elongation. Initially, tensile samples were prepared on wire EDM, further high-speed machining has been carried out on CNC milling using a mechanical carbide cutter to improve performance. The results showed that an improvement in tool-chip interface temperature (0.9–12%), specific energy (0.8–12%), yield strength (1.8–3.2%), and percentage elongation (1.0–8.9%) using green machining has been witnessed and confirmed that green machining is an alternative of the flood to enhance the strength while reducing the specific energy in addition to eco-friendly. Moreover, the comparative analysis between RSM and ANN results determined that the ANN delivers more precise results and confirms its adequacy when its correlation coefficients are large, and root mean square errors are small compared to those obtained through the RSM.
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Amar Prakash,N.Anandavalli,C.K.Madheswaran,N.Lakshmanan 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.13 No.3
In this paper, experimental investigations on high strength steel (HSS) stud connected steelconcrete composite (SCC) girders to understand the effect of shear connector density on their flexural behaviour is presented. SCC girder specimens were designed for three different shear capacities (100%, 85%,and 70%), by varying the number of stud connectors in the shear span. Three SCC girder specimens were tested under monotonic/quasi-static loading, while three similar girder specimens were subjected to nonreversal cyclic loading under simply supported end conditions. Details of casting the specimens, experimental set-up, and method of testing, instrumentation for the measurement of deflection, interface-slip and strain are discussed. It is found that SCC girder specimen designed for full shear capacity exhibits interface slip for loads beyond 25% of the ultimate load capacity. Specimens with lesser degree of shear connection show lower values of load at initiation of slip. Very good ductility is exhibited by all the HSS stud connected SCC girder specimens. It is observed that the ultimate moment of resistance as well as ductility gets reduced for HSS stud connected SCC girder with reduction in stud shear connector density. Efficiency factor indicating the effectiveness of high strength stud connectors in resisting interface forces is estimated to be 0.8 from the analysis. Failure mode is primarily flexure with fracturing of stud connectors and characterised by flexural cracking and crushing of concrete at top in the pure bending region. Local buckling in the top flange of steel beam was also observed at the loads near to failure, which is influenced by spacing of studs and top flange thickness of rolled steel section. One of the recommendations is that the ultimate load capacity can be limited to 1.5 times the plastic moment capacity of the section such that the post peak load reduction is kept within limits. Load-deflection behaviour for monotonic tests compared well with the envelope of load-deflection curves for cyclic tests. It is concluded from the experimental investigations that use of HSS studs will reduce their numbers for given loading, which is advantageous in case of long spans. Buckling of top flange of rolled section is observed at failure stage. Provision of lips in the top flange is suggested to avoid this buckling. This is possible in case of longer spans, where normally built-up sections are used.
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Amar Khadoumi,Madiha Ahlam Bouzekri,Ahlem Guerzou 국립중앙과학관 2022 Journal of Asia-Pacific Biodiversity Vol.15 No.4
The study of the myrmecofauna of Chott Zehrez Chergui, a Ramsar Conservation Wetland in Algeria, hasbeen conducted in three vegetal formations: a halophyte formation of Salsola vermiculata, a psammo phyte formation of Retama retam with Aristida pungens, and another halophyte formation of Atriplexhalimus. In total, 12 species of ants were listed. The most abundant species are Monomorium salomonis(55.73 %) in the halophyte site near Salsola vermiculata, Messor barbarus (37.82%) in the psammophytesite, and M. medioruber (41.83%) in halophyte of Atriplex halimus.
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Adaptability and Stability Analysis of Groundnut Genotypes Using AMMI Model and GGE-biplot
Amare Kebede B,Adisu Getahun 한국작물학회 2017 Journal of crop science and biotechnology Vol.20 No.5
Unpredictable rainfall, variations in farm inputs, crop-diseases, and the inherent potential of genotypes are among the major factors for low and variable crop yield. Fourteen elite groundnut genotypes were examined in 14 environments to analyze adaptability and stability of genotypes, and identify mega-environments if they exist. Additive main effect and multiplicative interaction (AMMI) model, cultivar-superiority measure, and genotype plus genotype-by-environment (GGE) biplot analysis were used for data analysis. The environment (69.8%) and genotype-by-environment interaction (GEI) effects (21.4%) were dominating the genotypic effect (8.8%). The GEI was significant (P < 0.01), and two distinct environments (mega-environments) were identified, suggesting separate national groundnut breeding strategies for Babile and Pawe. ICGV-94100 and ICGV-97156 were stable and had the highest-yield at Babile and Pawe, respectively. The higher heritability value was recorded in more homogeneous and favorable environments, indicating the genetic potential of groundnut genotypes were better attained in more homogeneous and favorable environments. AMMI model, cultivar-superiority measure, and GGE biplots were helpful methodologies and complemented each other to evaluate the adaptability and stability of groundnut genotypes in diverse environments.
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Amar Vennapusa,Ramakanth Bhargav Panchangam,Charita Kesara,Nazneen Mallick 대한내시경복강경외과학회 2021 Journal of Minimally Invasive Surgery Vol.24 No.1
Purpose: Laparoscopic sleeve gastrectomy (SG) with loop duodenojejunal bypass (LDJB) is a combination of SG and one anastomosis gastric bypass surgeries. This study was intended to evaluate the safety and feasibility of SG-LDJB surgery. Methods: This was a retrospective study analyzing SG-LDJB surgery using 250-cm length biliopancreatic limbs that was performed between May 2013 and December 2017 in 113 Indians with obesity. All demographic, clinical, operative, and follow-up data were analyzed for weight loss and diabetes remission efficacy. Weight-loss success was defined as percentage of total weight loss (%TWL) ≥ 25%. Diabetes remission was defined as hemoglobin A1c < 6% without the need for antidiabetic medications. Safety and feasibility were analyzed in terms of intraoperative and postoperative complications and serum albumin, iron, and calcium levels. Results: The %TWL was 35.0% and 31.0% at the 1-year and 3-year follow-ups, respectively. The weight-loss success rate was 91.3% and 78.1% at the 1-year and 3-year follow-ups, respectively. Sixty-six out of 113 patients had type 2 diabetes. Diabetes remission was 80.0% and 75.4% at the 1-year and 3-year follow-ups, respectively. Major perioperative complications occurred in 0.9% of the patients. The 30-day mortality rate was zero. None of the patients had serum albumin levels of <3 g/dL at the 1-year and 3-year follow-ups or symptoms of hypoproteinemia. Conclusion: SG-LDJB surgery using a 250-cm biliopancreatic limb is a safe and effective procedure to treat obesity. It is technically complex but has the advantages of endoscopic access to the stomach and negligible postoperative complications or hypoproteinemia.
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Amar Vennapusa,Ramakanth Bhargav Panchangam,Charita Kesara,Tejaswi Chivukula 대한비만학회 2020 The Korean journal of obesity Vol.29 No.3
Background: Laparoscopic sleeve gastrectomy with loop duodenojejunal bypass (SG LDJB) is a loop modification of biliopancreatic diversion with duodenal switch. The aim of this study was to analyze weight loss response and factors predicting weight loss outcomes after SG LDJB. Methods: This was a retrospective study analyzing SG LDJB surgeries performed between May 2013 and December 2017 in 126 Indians suffering from obesity. The collected data was analyzed to understand weight loss efficacy and the factors predicting weight loss. Surgery was considered successful when percentage excess weight loss (%EWL) was ≥50% or percentage total weight loss (%TWL) was ≥25%. Results: %EWL was 95.77% and 83.84% and %TWL was 34.64% and 30.32% at the 1-year and 3-year follow-up, respectively. %EWL ≥50% was 99.04% and 96.47% and %TWL ≥25% was 91.35% and 75.29% at the 1-year and 3-year follow-up, respectively. Patient age and sex did not independently predict %EWL or %TWL. Preoperative body mass index (BMI), weight, and excess weight negatively predicted %EWL and positively predicted %TWL at the 1-year and 3-year follow-up. Multiple regression analysis showed that these parameters were independent predictors of %EWL and %TWL at 1 year, while preoperative weight and excess weight also independently predicted %EWL at the 3-year follow-up. In diabetic patients, %EWL was significantly lower at the 3-year follow-up and %TWL was significantly lower at the 1-year and 3-year follow-up. Conclusion: SG LDJB was an effective bariatric surgery to treat obesity. Preoperative BMI, weight, excess weight, and the presence of diabetes were the significant factors associated with the weight loss outcomes.
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Amar Paul Singh,Kritish De,Virendra Prasad Uniyal,Sambandam Sathyakumar 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.2
In this artice, we studied the bioturbation and dung removal activity of dung beetle Catharsius molossus(Linnaeus, 1758) (Coleoptera: Scarabaeidae: Scarabaeinae) in different elevations in the Great HimalayanNational Park Conservation Area for the first time to understand the capability of the species in providingsuch ecosystem services with an experimental approach in six different elevations in the area. We foundthat the weight of dung buried and bioturbation had significant difference between the elevations, andthey had significant linear relationship with the elevations. Differences in such activities along theelevation can cause a low amount of nutrient transfer from the dung to the soil which can adverselyaffect the surrounding habitats.
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Amare WONDIRAD 한국서비스디자인학회 2023 한국서비스디자인학회 학술대회자료집 Vol.2023 No.1
Ecotourism has been widely promoted by academics and practitioners alike as a tool to achieve the dual aims of conservation and development. However,several scholars questioned whether sustainability goals can be successfully achieved through ecotourism. Of the various limiting factors of ejfective ecotourism development discussed in the literature, a lack of ejfective stakeholder collaboration is pervasive. This study investigates the contributions of stakeholder collaboration towards sustainable ecotourism development in a developing country setting by employing stakeholder and collaboration theories and triple-bottom-line principles. Through adopting a qualitative research approach with an exploratory design, the current study unfolds the existence of poor interactions and collaboration among ecotourism stakeholders, which in turn, affects the sustainable development of ecotourism. Findings challenge that in poorly resourced remote destinations, failure to meaningfully empower and participate communities does not only undermine the successful development of ecotourism but also it jeopardizes the long-term survival of the ecosystem and communities themselves.
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