Modeling and optimization of flank wear and surface roughness of Monel-400 during hot turning using artificial intelligence techniques

This work aims to model and investigate the effect of cutting speed, feed rate, depth of cut and the workpiece temperature on surface roughness and flank wear (responses) of Monel-400 during turning operation. It also aims to optimize the machining parameters of the above operation. A power-law model is developed for this purpose and is corroborated by comparing the results with the artificial neural network (ANN) model. Based on the coefficient of determination (R2), mean square error (MSE), and mean absolute percentage error (MAPE) the results of the power-law model are found to be in close agreement with that of ANN. Also, the proposed power law and ANN models for surface roughness and flank wear are in close agreement with the experiment results. For the power-law model R2, MSE, and MAPE were found to be 99.83%, 9.9×10-4, and 3.32×10-2, and that of ANN were found to be 99.91%, 5.4×10-4, and 5.96×10-2, respectively for surface roughness and flank wear. An error of 0.0642% (minimum) and 8.7346% (maximum) for surface roughness and 0.0261% (minimum) and 4.6073% (maximum) for flank wear were recorded between the observed and experimental results, respectively. In order to optimize the objective functions obtained from power-law models of the surface roughness and flank wear, GA (genetic algorithm) was used to determine the optimal values of the operating parameters and objective functions thereof. The optimal value of 2.1973 µm and 0.256 mm were found for surface roughness and flank wear, respectively

Carotid intima-media thickness as a marker for assessing the severity of coronary artery disease on coronary angiography

Background: Coronary artery disease (CAD), the leading cause of death worldwide, has a huge area of primary prevention where patients at risk can be identified for more intensive, evidence-based medical interventions to reduce cardiovascular events. Whereas coronary angiography has stood the test of time to assess atherosclerotic burden, it is still unavailable to a huge population at risk of CAD. This study was devised in search of a cheap and simple tool to assess atherosclerotic burden. We aimed to investigate the relationship between Carotid Intima Media Thickness (CIMT) and Coronary Artery Disease (CAD) in patients evaluated by coronary angiography for suspected CAD and whether CIMT could predict the extension of CAD.Methods: This study was a cross-sectional study conducted from March 2013 to September 2015 in Department of Medicine, SMHS Hospital, J and K, India. A total of 100 patients admitted to for undergoing coronary angiography indicated for suspected coronary artery disease were enrolled. the risk factors evaluated in this study included age, body mass index, sex, dyslipidemia, hypertension, diabetes mellitus and smoking. CAD was assessed and classified by coronary angiography and CIMT was assessed by carotid doppler.Results: There was a positive relationship between CIMT and CAD. Risk factors like Age, smoking, BMI, cholesterol, hypertension, and diabetes had significant positive effect on CIMT; whereas gender, VLDL, triglycerides, HDL and LDL were statistically insignificant in affecting CIMT.Conclusions: CIMT is a cheap and simple tool to predict the extent of CAD

Pengaruh Frekuensi Pemberian Pakan Terhadap Pertumbuhan Dan Kelulushidupan Benih Tawes (Puntius Javanicus)

Manajemen pemberian pakan adalah suatu USAha untuk memaksimalkan pemanfaatan pakan untuk pertumbuhan. Salah satu metode yang diterapkan dalam manajemen pemberian pakan adalah dengan memberikan pakan pada waktu yang tepat saat dibutuhkan. Tujuan dari penelitian ini adalah mengkaji pengaruh frekuensi pemberian pakan terhadap pertumbuhan dan kelulushidupan benih tawes. Metode penelitian yang digunakan adalah eksperimental laboratorium. Desain penelitian ini adalah rancangan acak lengkap menggunakan 4 perlakuan dengan 3 pengulangan. Perlakuannya adalah pemberian frekuensi pakan masing-masing 1(A), 2(B), 3(C) dan 4(D) kali sehari dengan metode pemberian pakan at satiation. Hasil dari penelitian ini didapatkan hasil bahwa frekuensi pemberian pakan berpengaruh nyata terhadap tingkat konsumsi pakan, laju pertumbuhan relatif individu serta laju pertumbuhan panjang tubuh relatif benih tawes, namun tidak memberikan pengaruh nyata pada kelulushidupan, rasio konversi pakan dan rasio efisiensi protein. Frekuensi pemberian pakan tiga kali sehari menghasilkan nilai terbaik pada laju pertumbuhan bobot (6,26-6,38% per hari) dan laju pertumbuhan panjang tubuh (1,04-1,06% per hari). Nilai rasio konversi pakan berkisar 1,89-2,08; rasio efisiensi protein 96,55-133,07% dan nilai kelulushidupan berkisar 66,16-85%. Hasil penelitian ini menyimpulkan bahwa pemberian pakan tiga sampai empat kali sehari dapat meningkatkan pertumbuhan bagi benih tawes. Feeding management was an effort to optimize the function of feed given for growth. One of the method that could be applied was by fed the fish feed just the time as it was required. The purpose of this study was to find the effect of feeding frequencies on the growth and survival rate of java barb juveniles. This study was an experimental laboratory method. The design of the experiment was completely randomized design with 4 treatments and 3 replicates. The treatments were feeding frequency 1(A), 2(B), 3(C) and 4(D) time a day with at satiation method. This study showed that various feeding frequencies significantly affected on the feed consumption, relative growth rate, and relative body length of the trial fish but not significantly affected on the survival rate, feed conversion ratio, and protein efficiency ratio. Feeding frequencies of 3 and 4 times a day resulted the best values on relative growth rate (i.e 6,29-6,38% per day) and relative body length (i.e 1,04-1,06% per day) of the fish. The values of feed conversion, protein efficiency ratio, and survival rate were variated beetwen 1,89-2,08; 96,55-133,07%; and 66,16-85%. It was concluded that feeding frequencies 3 to 4 times a day could increased the growth of the java barb juveniles

Aplikasi Pembelajaran Jarak Jauh Pada Lembaga Pendidikan Primagama Berbasis Website Responsive

Teknologi mendukung aktivitas manusia disegala bidang dan aspek, termasuk bidang pendidikan. Dalam hal ini, teknologi dapat diimplementasikan dalam bentuk pembelajaran jarak jauh atau lebih dikenal dengan sebutan elearning. Elearning memiliki beberapa manfaat baik bagi lembaga pendidikan, pengajar, dan siswanya. Lembaga pendidikan Primagama merupakan salah satu lembaga pendidikan swasta yang besar dan memiliki kapabilitas di Indonesia. Kegiatan yang dilakukan berupa bimbingan belajar yang dilakukan diluar jam belajar sekolah dengan tenaga pengajar yang professional. Dengan jam mengajar dan siswa yang beragam, diperlukan dukungan teknologi informasi untuk membuat sebuah transformasi proses belajar mengajar kedalam bentuk digital yang dapat diakses secara online. Aplikasi ini diwujudkan dalam bentuk website responsive yang dapat dengan mudah diakses dimana saja melalui smartphone. Maka dari itu dengan dibuatnya aplikasi pembelajaran jarak jauh ini, kegiatan belajar mengajar dapat dilakukan lebih optimal dan menyenangkan. Aplikasi ini diharapkan akan banyak membantu proses belajar siswa dan dapat memberikan solusi agar pendidikan lebih baik lagi di masa mendatang

Taxonomies in knowledge organisation — Need, description and benefits

This paper is an expression about historical background, current trends and applications of taxonomies. It is based on the published literature discussing various aspects of taxonomies. The survey is based on free text search for the terms: Taxonomy, Knowledge organisation, Knowledge organisation systems, and Knowledge organisation tools in various online databases (Emerald, Taylor & Francis, Wilson web, Science Direct, Wiley online), and Google. Besides online databases some articles were identified from conventional journals and books. A number of periodicals across disciplines cover the subject. After analysis the relevant articles coinciding with the scope of the paper are presented under three categories: need, description, and benefits. The review reveals that the use of taxonomies is being highly advocated by the scholars for the efficient knowledge organization and retrieval of information in the digital environment due to the expeditious and compounded growth of information on the web and the failure of search engines to retrieve the relevant information. The ability of the taxonomies to retrieve the digital information with high precision and recall is unanimously accepted and established beyond doubt. It is also revealed that taxonomies are being implemented in various organizations/web portals across the globe

IMPACT OF OPEN ACCESS RESEARCH CONTRIBUTIONS ACROSS SELECT DISCIPLINES

The study is based on 4,413 papers identified from Elsevier's Scopus for various fields from 2000 to 2004 to assess the research impact of OA journal articles, from DOAJ based journals, using sampling techniques following 'R' software. It focuses to test the hypothesis "OA articles in hard, urban and convergent fields receive more citations (hence higher research impact) than those in soft, rural and divergent subjects, besides a comparative study of research impact across disciplines, supported with experimental method and literature review

Carotid intima-media thickness as a marker for assessing the severity of coronary artery disease on coronary angiography

Background: Coronary artery disease (CAD), the leading cause of death worldwide, has a huge area of primary prevention where patients at risk can be identified for more intensive, evidence-based medical interventions to reduce cardiovascular events. Whereas coronary angiography has stood the test of time to assess atherosclerotic burden, it is still unavailable to a huge population at risk of CAD. This study was devised in search of a cheap and simple tool to assess atherosclerotic burden. We aimed to investigate the relationship between Carotid Intima Media Thickness (CIMT) and Coronary Artery Disease (CAD) in patients evaluated by coronary angiography for suspected CAD and whether CIMT could predict the extension of CAD.Methods: This study was a cross-sectional study conducted from March 2013 to September 2015 in Department of Medicine, SMHS Hospital, J and K, India. A total of 100 patients admitted to for undergoing coronary angiography indicated for suspected coronary artery disease were enrolled. the risk factors evaluated in this study included age, body mass index, sex, dyslipidemia, hypertension, diabetes mellitus and smoking. CAD was assessed and classified by coronary angiography and CIMT was assessed by carotid doppler.Results: There was a positive relationship between CIMT and CAD. Risk factors like Age, smoking, BMI, cholesterol, hypertension, and diabetes had significant positive effect on CIMT; whereas gender, VLDL, triglycerides, HDL and LDL were statistically insignificant in affecting CIMT.Conclusions: CIMT is a cheap and simple tool to predict the extent of CAD

Assessment of above- and belowground carbon pools in a semi-arid forest ecosystem of Delhi, India

Abstract Background Assessment of carbon pools in semi-arid forests of India is crucial in order to develop a better action plan for management of such ecosystems under global climate change and rapid urbanization. This study, therefore, aims to assess the above- and belowground carbon storage potential of a semi-arid forest ecosystem of Delhi. Methods For the study, two forest sites were selected, i.e., north ridge (NRF) and central ridge (CRF). Aboveground tree biomass was estimated by using growing stock volume equations developed by Forest Survey of India and specific wood density. Understory biomass was determined by harvest sampling method. Belowground (root) biomass was determined by using a developed equation. For soil organic carbon (SOC), soil samples were collected at 0–10-cm and 10–20-cm depth and carbon content was estimated. Results The present study estimated 90.51 Mg ha−1 biomass and 63.49 Mg C ha−1 carbon in the semi-arid forest of Delhi, India. The lower diameter classes showed highest tree density, i.e., 240 and 328 individuals ha−1 (11–20 cm), basal area, i.e., 8.7 (31–40 cm) and 6.08 m2 ha−1 (11–20 cm), and biomass, i.e., 24.25 and 23.57 Mg ha−1 (11–20 cm) in NRF and CRF, respectively. Furthermore, a significant contribution of biomass (7.8 Mg ha−1) in DBH class 81–90 cm in NRF suggested the importance of mature trees in biomass and carbon storage. The forests were predominantly occupied by Prosopis juliflora (Sw.) DC which also showed the highest contribution to the (approximately 40%) tree biomass. Carbon allocation was maximum in aboveground (40–49%), followed by soil (29.93–37.7%), belowground or root (20–22%), and litter (0.27–0.59%). Conclusion Our study suggested plant biomass and soils are the potential pools of carbon storage in these forests. Furthermore, carbon storage in tree biomass was found to be mainly influenced by tree density, basal area, and species diversity. Trees belonging to lower DBH classes are the major carbon sinks in these forests. In the study, native trees contributed to the significant amount of carbon stored in their biomass and soils. The estimated data is important in framing forest management plans and strategies aimed at enhancing carbon sequestration potential of semi-arid forest ecosystems of India