Transformer Diagnosis Using UV-Spectrophotometer

A power transformer is most significant and extremely important element in the power utility industry. Transformers are key-stone in transmission and distribution system. The failure of power transformer causes the interruption of power supply, huge financial loss. Failure coming without warning is responsible for large economic losses and unscheduled outage. In the absence of transformers components monitoring and diagnostics, the failure risk always remain high. The System abnormalities such as over loading, frequent switching, sever weather condition and poor maintains normally contribute to accelerated aging. The lack of proper monitoring and diagnostics leads to high risk of failure. Diagnostics and proper monitoring plays key role in the life expectancy of proper transformer. Mineral oil in transformer is the inseparable component of the dielectric insulation system. In this paper a new diagnostic technique for power transformer diagnostics known as uv spectrophotometry for transformer oil analysis has been discussed. This paper presents basic information about uv spectrophotometer, sampling and testing of transformer oil. Based on the spectrophotometer results and their subsequent analysis condition of transformer oil can be predicte

Neuromorphic In-Memory Computing Framework using Memtransistor Cross-bar based Support Vector Machines

This paper presents a novel framework for designing support vector machines (SVMs), which does not impose restriction on the SVM kernel to be positive-definite and allows the user to define memory constraint in terms of fixed template vectors. This makes the framework scalable and enables its implementation for low-power, high-density and memory constrained embedded application. An efficient hardware implementation of the same is also discussed, which utilizes novel low power memtransistor based cross-bar architecture, and is robust to device mismatch and randomness. We used memtransistor measurement data, and showed that the designed SVMs can achieve classification accuracy comparable to traditional SVMs on both synthetic and real-world benchmark datasets. This framework would be beneficial for design of SVM based wake-up systems for internet of things (IoTs) and edge devices where memtransistors can be used to optimize system's energy-efficiency and perform in-memory matrix-vector multiplication (MVM).Comment: 4 pages, 5 figures, MWSCAS 201

Heavy Quarkonia in a Potential Model: Binding Energy, Decay Width, and Survival Probability

Recently a lot of progress has been made in deriving the heavy quark potential within a QCD medium. In this article we have considered heavy quarkonium in a hot quark gluon plasma phase. The heavy-quark potential has been modeled properly for short as well as long distances. The potential at long distances is modeled as a QCD string which is screened at the same scale as the Coloumb field. We have numerically solved the 1+1-dimensional Schrodinger equation for this potential and obtained the eigen wavefunction and binding energy for the $1S$ and $2S$ states of charmonium and bottomonium. Further, we have calculated the decay width and dissociation temperature of quarkonium states in the QCD plasma. Finally, we have used our recently proposed unified model with these new values of decay widths to calculate the survival probability of the various quarkonium states with respect to centrality at relativistic heavy ion collider (RHIC) and large hadron collider (LHC) energies. This study provides a unified, consistent and comprehensive description of spectroscopic properties of various quarkonium states at finite temperatures along with their nuclear modification factor at different collision energies.Comment: 26 page, 25 Figures, 1 Tabl

Importance of carotid intimal medial thickness measurement in patients with coronary artery disease

Background: Prevalence of CAD in urban India is about double that of rural India and about 4-fold higher than in United States. Mortality related to CAD is high in Indian Population. Early diagnosis can prevent the CAD related morbidity and mortality. Aims and objectives is to study and compare the CIMT among the patients with CAD and asymptomatic control group.Methods: Hundred patients with CAD were studied for the CIMT and compared with age and sex matched asymptomatic control subjects in Department of Medicine of G. R. Medical College, Gwalior for one year from 2012 to 2013. Details on history, risk factors and presenting symptoms were recorded for all. High resolution B mode ultrasonography was performed to assess CIMT of carotid arteries.Results: CAD was more prevalent among males (78%) having mean age of 56.82±8.91 years. Majority of CAD patients had dyslipidemia (42%) followed by hypertension (21%), diabetes (13%) and smoking (17%). Majority of the CAD patients had chest pain (98%) followed by breathlessness (54%) and sweating (12%) as the most common presenting symptom. Mean CIMT was significantly more among the CAD patients (0.76±0.34) as compared to those without it (0.63±0.22) (p<0.001).Conclusions: CIMT was found to be more in CAD as compared to asymptomatic control subjects. CIMT can be an important tool for assessing CAD and atherosclerosis

Hyperon bulk viscosity and rr-modes of neutron stars

We propose and apply a new parameterization of the modified chiral effective model to study rotating neutron stars with hyperon cores in the framework of the relativistic mean-field theory. The inclusion of mesonic cross couplings in the model has improved the density content of the symmetry energy slope parameters, which are in agreement with the findings from recent terrestrial experiments. The bulk viscosity of the hyperonic medium is analyzed to investigate its role in the suppression of gravitationally driven $r$-modes. The hyperonic bulk viscosity coefficient caused by non-leptonic weak interactions and the corresponding damping timescales are calculated and the $r$-mode instability windows are obtained. The present model predicts a significant reduction of the unstable region due to a more effective damping of oscillations. We find that from $\sim 10^8$ K to $\sim 10^{9}$ K, hyperonic bulk viscosity completely suppresses the $r$-modes leading to a stable region between the instability windows. Our analysis indicates that the instability can reduce the angular velocity of the star up to $\sim$0.3~$\Omega_K$, where $\Omega_K$ is the Kepler frequency of the star.Comment: 9 pages, 9 figures; Accepted for publication in MNRA

The Integration of Lean and Human Resource Management Practices as an Enabler for Lean Deployment- A Systematic Literature Review

Purpose – The current research aims to map and investigate how Human Resource Management and Lean practices can be integrated. This investigation will help identify the Human Resource Management aspects critical in the success of Lean initiatives while exploring the research gaps in the existing literature. The review also aims to delineate the benefits and challenges of integrating Lean with Human Resource Management systems to discuss further research and practice areas. Design/methodology/approach – This study utilizes a Systematic Literature Review method to identify and synthesize the existing literature. As part of the process, a protocol that provided a plan for the review was followed, including the research questions and the data to be extracted. Findings– The study results indicate that aspects of Human Resources Management practice and policies such as Training & Development, Teamwork, Motivation, Communication, Leadership, are key enablers of Lean initiative deployment and success. The benefits of the integration of Human Resources with Lean 15 can help in Lean training and development, communication of Lean initiatives and successes, allocating and hiring continuous improvement personnel, and supporting leadership in Lean deployment. Challenges to integrating Lean and HRM practices included lack of integration and collaboration between disciplines. Further exploration areas in successful Lean deployment would be practical longitudinal case studies on Lean deployments with HR partnerships and involvement. Practical implications – This review paper has crucial implications for practice relating to, integration of Lean with Human resource management structures and tailoring Human resource management initiatives to ensure the success of Lean deployment and reduce risks of failure. Originality/value – The Systematic literature review study conducted in this paper is the first of its kind to integrate and map the human resource management concepts that can be integrated with Lean to deploy the initiative successfully. This mapping is critical for ensuring the success of Lean methodologies within an organization and paves the way for future research. In addition, managers and organizations can find support and guidance from this study to focus on vital areas of partnership between their Lean and HR programs

Dielectric properties of PbSrWO4 and PbBaWO4 compounds

PbSrWO4 and PbBaWO4 have been synthesised by the solid state reaction technique XRD patterns show them to be tetragonal. Dielectric constant (K/) and Dielectric loss (K//) of PbSrWO4 and PbBaWO4 have been measured at 1 kHz in the temperature range of 300 to 1050 K. The log K/ vs T as well as log K// vs T plot of PbSrWO4 and PbBaWO4 shows rapid increase of dielectric constant above 590 K and 640 K, respectively.Author Affiliation: S V Singh, A N Thakur, O P Singh, S C Kumar and Aqil Ahmad 1.Department of Physics, T D Post Graduate College Jaunpur-222 002, Uttar Pradesh, India E-mail : [email protected] of Physics, T D Post Graduate College Jaunpur-222 002, Uttar Pradesh, Indi

Variation among foliar isolates of Colletotrichum sublineolum of sorghum in Nigeria

Foliar anthracnose, caused by Colletotrichum sublineolum, is a major disease of sorghum in Nigeria. Pathogenic diversity was studied among foliar isolates of C. sublineolum collected from sorghum cultivars in farmers fields in the Sahel, Sudan, northern Guinea and southern Guinea zones of Nigeria during the 1997 crop season. For the study a total of 50 isolates were identified based on typical symptom types and cultural characteristics. On the basis of growth in culture and morphological characteristics, the isolates were classified into nine morphological groups (MGs). Pathogenicity tests were done on a set of known sorghum differential lines by inoculating pot-grown seedlings in a greenhouse. On the basis of disease reaction and disease severity scores on the differential lines, the 50 isolates were classified into seven pathogenic groups (PGs). Sixteen representative isolates of the MGs and the PGs were further evaluated for virulence and aggressiveness on the differential lines and were classified into five distinct groups using the centroid method of cluster analysis. The existence of five races of C. sublineolum in major sorghum growing zones of Nigeria is suggeste

Low temperature specific heat of La_{3}Pd_{4}Ge_{4} with U_{3}Ni_{4}Si_{4}-type structure

Low temperature specific heat has been investigated in a novel ternary superconductor La_{3}Pd_{4}Ge_{4} with an U_{3}Ni_{4}Si_{4}-type structure consisting of the alternating BaAl_{4} (ThCr_{2}Si_{2})- and AlB$_{2}$-type layers. A comparative study with the related ThCr_{2}Si_{2}-type superconductor LaPd_{2}Ge_{2}, one of the layers in La_{3}Pd_{4}Ge_{4}, is also presented. From the normal state specific heat, the Sommerfeld coefficient $\gamma_{n} = 27.0$ mJ/mol K^2 and the Debye temperature $\Theta_{\rm D}$ = 256 K are derived for the La_{3}Pd_{4}Ge_{4}, while those for the LaPd_{2}Ge_{2} are $\gamma_{n} =8.26$ mJ/mol K^2 and $\Theta_{\rm D}$ = 291 K. The La_{3}Pd_{4}Ge_{4} has moderately high electronic density of state at the Fermi level. Electronic contribution on the specific heat, $C_{\rm el}$, in each compound is well described by the BCS behavior, suggesting that both of the La_{3}Pd_{4}Ge_{4} and the LaPd_{2}Ge_{2} have fully opened isotropic gap in the superconducting state