Quantum Monte Carlo studies of phase transitions

Phase transitions have been an active area of research in statistical mechanics for almost a century and have recently been integrated into quantum mechanics. Many phenomena such as superconductivity and unconventional magnetism are understood to arise from exotic quantum phases and at points describing quantum phase transitions. A detailed understanding of these phase transitions requires numerical simulations of models which benchmark realistic models against theoretical frameworks. The topic of this thesis is the implementation of Quantum Monte Carlo simulation, which is a powerful technique to understand quantum condensed matter, in interesting models to illustrate novel phenomena in magnetic systems. The novel features of condensed matter systems described in this thesis consist of emergent symmetries at critical points, interesting dynamical features of such systems and the drastic effects of defects in spin systems used in the field of adiabatic quantum computing. Emergent symmetries are shown by condensed matter systems especially at critical points and are features which cannot be shown by individual or a small number of spins. Examples of this in one and two dimensions are presented in an early chapter of this thesis. In addition to this, spin systems can show excitations which have an interesting spatial structure as a consequence of restricted dynamics which only allow the excitations to spread in a particular region. This is presented in the context of a simple model in the following chapter along with numerical support. The following chapter contains a description of adiabatic quantum computing along with a particular model which we study. The phase transition and the effects on the performance of adiabatic quantum computing are studied in this context

Circuit simulation using explicit methods: singular matrix issues

Some aspects of the ELectrical EXplicit (ELEX) scheme for using explicit integration schemes in circuit simulation are discussed. It is pointed out that the parallel resistor approach, presented earlier to address singular matrix issues arising in the ELEX scheme, is not adequately robust for incorporation in a general-purpose simulator for power electronic circuits. New topology-aware approaches, which are more robust and efficient compared to the parallel resistor approach, are presented. Several circuit examples are considered to illustrate the new approaches.Comment: 8 pages, 9 figure

Immunomodulatory effects of fruits of Barringtonia racemosa Linn.

Background: Barringtonia racemosa (B. racemosa) is used medicinally in treatment of diarrhoea, asthma, coughs, jaundice. It is also used as an analgesic and antipyretic. This plant has also significant anti-tumor activity. However, systematic evaluation of its immunomodulatory effects has not been reported. In present study the hydroalcoholic extract of fruits of B. racemosa has been evaluated for its immunomodulatory properties in animal models.Methods: Extract of Fruits of B. racemosa was prepared from fruit powder and methanol by macerations and filtration. Healthy albino Wistar rats of either sex having 110-160 g body weight were used for this study. 1. Delayed type hypersensitivity reaction (DTH) using Sheep red blood cells (SRBCs): After immunization with SRBC effect of cyclophosphamide and hydroalcoholic extract of B. racemosa was seen on paw volume changes in rats challenged with SRBC by using digital Plethysmometer. 2. Humoral antibody response to SRBC: Animas were immunized with SRBC and treated with cyclophosphamide and hydroalcoholic extract of B. racemosa. Serum of these animals was observed for haemagglutination titer.Results: Fruits extract at the dose of 5 mg/kg i.p. showed significant decrease in DTH response as compared to that of control group animals. However, the effect of extract was less potent as compared to that of cyclophosphamide treated group. In haemagglutination titer assay, antibody titer in case naïve control, SRBC treated, cyclophosphamide treated and extract treated groups was 1:1, 1:32, 1:8 and 1:16 respectively.Conclusions: The hydroalcoholic extract of this fruits was found to inhibit SRBCs induced DTH in rats. Similarly, SRBCs induced antibody titer was also reduced

Spinal anesthesia versus general anesthesia for percutaneous nephrolithotomy surgeries - a prospective study

Background: Percutaneous nephrolithotomy (PCNL) is a minimally invasive surgery for extracting renal and urinary stones, and a choice modality in large, multiple, and stag-horn stones. Anaesthesia for PCNL can be general or regional. Despite good results of PNCL with general anaesthesia, it may cause atelectasis, drug reactions, nausea, and vomiting. General anaesthesia (GA) has its limitations in the form of poor postoperative pain control, greater incidence of nausea and vomiting, prolonged recovery stays and prolonged hospitalizations.Methods: The study was performed in a tertiary care centre. A prospective, randomised study including 60 patients divided into 2 groups. Data collection tools included study proforma, numerical rating scale (NRS) scores and visual analog scale (VAS) scores. Data analysed using science and statistical packaged (SPSS) version 21, independent t tests and z-test for proportion.Results: The demographic data when statistically analysed showed no statistically significant differences between the groups. Haemoglobin percentage (Hb%) was significantly lower in GA group. Spinal anaesthesia (SA) group showed lower VAS and NRS scores hence lower requirement of pain relief and antiemetics. The post-operative complications were insignificant.Conclusions: We concluded that SA is safe and effective method as an alternative method for PCNL surgeries.

Cloud Security using Image based Attribute Encryption Scheme

In the realm of specialized life distributed computing has turned out to be fundamental part and furthermore understanding the method for business is changing and is probably going to keep changing into what's to come. Utilizing distributed storage administrations implies that you and others can get to and share records over a scope of gadgets and position. Records, for example, photographs and recordings can now and then be unmanageable to email on the off chance that they are too enormous or you have designate of information. You can transfer your information to a distributed storage supplier implies you can quickly flow your information with the assistance of cloud administration and you can impart your information documents to anybody you pick. Since distributed computing offers dispersed assets by means of system in the open condition hence it makes less secured. Information security has turned into a noteworthy issue in information sharing on cloud. The primary maxim behind our framework is that it secures the information and creates the key for every exchange so every client can secure our mutual information by the outsider i.e. untrustworthy programmer

SHORT COMMUNICATION: Reduction of Spirometric Lung Function Tests in Habitually Smoking Healthy Young Adults: Its Correlation with Pack Years

Background: Adolescent smoking and the subsequent health problems are a major concern today. However there are very few studies done on spirometric lung functions and its relation with pack years in young adult habitual smokers who are apparently healthy. Aims and Objectives: The present study is undertaken to assess the change in lung functions in apparently healthy young adult habitual smokers compared to their age matched controls. Materials and Methods: A random sample of apparently healthy young adult habitual smokers (n=40) and nonsmokers (n=40) between age group17-35 years with history suggesting of pack years of 2-10 years were selected from students & employees of B.L.D.E.Us Sri B.M. Patil Medical College,Hospital & Research Centre Bijapur (Karnataka), India. Spirometric lung functions recorded were forced expiratory volume in one second (FEV1), FEV1%, Peak expiratory flow rate (PEFR) and Maximal expiratory pressure (MEP). Results: The results suggested that inapparently healthy habitual smokers there was significant decrease in FEV1 (L) (-13.34%, p<0.001), FEV1 % (-10.76%, p<0.001), PEFR (-45.26%, p<0.0001) and MEP (-35.51%, p<0.0001) compared to nonsmokers and decrease in FEV1 was negatively correlated withpack years in smokers (r2=0.063, p=0.001). Reduced lung functions and negative correlation to pack years may be attributed todecreased airway diameter & reflex broncho- constriction in response to inhaled smoke particles. Conclusions: In conclusion young adulthabitual smokers who were apparently healthy are more prone for respiratory dysfunction than their nonsmoker counterparts. FEV1 reduction in relation to pack years acts as an important determinant for detecting lung dysfunction in the early stage of the disease. As the risk of having smoking related diseases depends mainly on number of pack years, it is suggested that quitting smoking earliest helps to get greatest health benefits in apparently healthy young adult habitual smokers

Inference of FDI in Indian retail sector: Some Reflections

Purpose- The Indian retail market, which was largely unorganized till the 1980s, has undergone an immense transformation in post-liberalization era. However, valued at $450 billion, the Indian retail sector is still relatively small by global standards, with giants like Wal-Mart alone reporting over US$ 315 billion (approx) in global sale. India is estimated to have around 15 million retail outlets, making it the country with the highest retail outlet density in the world. A.T. Kearney, a well known international management consultancy, in the year 2009, identified India as the most attractive retail destination in the world. With a significant contribution to the national GDP (10 percent) and employment (8 percent, second largest employer after agriculture) this sector can definitely be referred as one of the pillars of the Indian economy. Design/methodology/approach- The paper pulls together various strains of research and data gathere from sound databases to discuss the status. Findings- In their preparation to face fierce competitive pressure, Indian retailers must come to recognize the value of building their own stores as brands to reinforce their marketing Positioning, to communicate quality as well as value for money. Sustainable competitive advantage will be dependent on translating core values combining products, image and reputation into a coherent retail brand strategy. Viewpoint Reference to this paper should be made as follows: Deshpande, M., Gaddi, A., Patil, S. R. (2014). “Inference of FDI in Indian retail sector- Some Reflections”, Journal of Entrepreneurship, Business and Economics, Vol. 2, No. 2, pp. 82–97