Laughlin Wave Function and One-Dimensional Free Fermions

Making use of the well-known phase space reduction in the lowest Landau level(LLL), we show that the Laughlin wave function for the $\nu = {1\over m}$ case can be obtained exactly as a coherent state representation of an one dimensional $(1D)$ wave function. The $1D$ system consists of $m$ copies of free fermions associated with each of the $N$ electrons, confined in a common harmonic well potential. Interestingly, the condition for this exact correspondence is found to incorporate Jain's parton picture. We argue that, this correspondence between the free fermions and quantum Hall effect is due to the mapping of the $1D$ system under consideration, to the Gaussian unitary ensemble in the random matrix theory.Comment: 7 pages, Latex , no figure

Magnetoplasmons in quantum rings

We have studied the structure and dipole charge density response of nanorings as a function of the magnetic field using local-spin density functional theory. Two small rings consisting of 12 and 22 electrons confined by a positively charged background are used to represent the cases of a narrow and a wide ring. The results are qualitatively compared with experimental data existing on microrings and on antidots. A smaller ring containing 5 electrons is also analyzed to allow for a closer comparison with a recent experiment on a two electron quantum ring.Comment: Typeset using Revtex, 13 pages and 11 Postscript figure

Feasibility Study of Processing Estane-based LOVA Gun Propellant

Low vulnerability ammunition (LOVA) propellant are currently being developed globally toreplace all types of single-base, double-base and triple-base gun propellants, because LOVApropellants possess advantage like low vulnerability without compromising on ballistic properties.The objective of present study is to establish processing of thermoplastic elastomer (TPE);estane-based LOVA gun propellant in cord/heptatubular geometry.  Keeping in view variousadvantages of TPE such as simple processing, greater dimensional stability, lower productionlosses, superior insensitivity, and mechanical properties of the propellants, estane 5731(polyurethane-ester-MDI, aromatic polyester) is selected for feasibility study as a binder inLOVA-based gun propellant composition, processed by solvent and semi-solvent methods andcompared feasibility of processing as well as their evaluation wrt ballistics, vulnerability, andmechanical properties. The results indicate that gun propellants processed by semi-solventmethod and extruded at elevated temperatures exhibit better ballistics, mechanical, andvulnerability properties

Evaluation of Biologically Active Compounds from Calendula officinalis Flowers using Spectrophotometry

<p>Abstract</p> <p>Background</p> <p>This study aimed to quantify the active biological compounds in <it>C. officinalis </it>flowers. Based on the active principles and biological properties of marigolds flowers reported in the literature, we sought to obtain and characterize the molecular composition of extracts prepared using different solvents. The antioxidant capacities of extracts were assessed by using spectrophotometry to measure both absorbance of the colorimetric free radical scavenger 2,2-diphenyl-1-picrylhydrazyl (DPPH) as well as the total antioxidant potential, using the ferric reducing power (FRAP) assay.</p> <p>Results</p> <p>Spectrophotometric assays in the ultraviolet-visible (UV-VIS) region enabled identification and characterization of the full range of phenolic and flavonoids acids, and high-performance liquid chromatography (HPLC) was used to identify and quantify phenolic compounds (depending on the method of extraction). Methanol ensured more efficient extraction of flavonoids than the other solvents tested.</p> <p>Antioxidant activity in methanolic extracts was correlated with the polyphenol content.</p> <p>Conclusions</p> <p>The UV-VIS spectra of assimilator pigments (e.g. chlorophylls), polyphenols and flavonoids extracted from the <it>C. officinalis </it>flowers consisted in quantitative evaluation of compounds which absorb to wavelengths broader than 360 nm.</p

A neo-institutional perspective on ethical decision-making

Drawing on neo-institutional theory, this study aims to discern the poorly understood ethical challenges confronted by senior executives in Indian multinational corporations and identify the strategies that they utilize to overcome them. We conducted in-depth interviews with 40 senior executives in Indian multinational corporations to illustrate these challenges and strategies. By embedding our research in contextually relevant characteristics that embody the Indian environment, we identify several institutional- and managerial-level challenges faced by executives. The institutional-level challenges are interpreted as regulative, normative and cognitive shortcomings. We recommend a concerted effort at the institutional and managerial levels by identifying relevant strategies for ethical decision-making. Moreover, we proffer a multi-level model of ethical decision-making and discuss our theoretical contributions and practical implications

Anti-cancer agents from natural sources: A review

The natural products have played a dominant role in the treatment of human ailments. The discovery of penicillin has changed the scenario of modern medicine. With the ancient use of quinine for malaria, willow bark for pain and several other natural products used as medicines in ancient system of medicine such as Ayurveda and traditional China, the discovery of the medicines for the allopathic use from natural source has gained substantial attention. The ancient system of Ayurveda describes the used of many plants extracts being used for the treatment of cancer. Prevailing epidemiological factors have also described the use of the msediterranean diet and inclusion of fruits and vegetables to score low as risk factor for the cancers. Further the several discoveries have led to the transformation of the active constituents of the natural products from the dietary sources for the chemoprevention. Substantial trials in the development of the drugs from the marine and microbial origin have been fruitful and positive to develop safe and efficacious drugs. However, the success being very low due to unavailability of natural products in large gram amounts required for the clinical trials. The total synthesis of m any natural products from marine origin has also emerged to solve this issue and led to successful development of 4 marine drugs as anti-cancer agents. This overview reviews the anticancer drugs from the natural origin as the chemo preventive and chemotherapeutic agents. Wherever possible the details of the clinical trials have been discussed along with uses and mechanism of action.</jats:p

PEPTIDE DELIVERY VIA NASAL ROUTE: EXPLORING RECENT DEVELOPMENTS AND APPROACHES

There has been a significant increase in interest in using the nasal route to administer peptides. This is mainly due to its advantages, including less invasiveness, rapid absorption, and the ability to bypass initial metabolism in the liver. The incorporation of nanotechnology has emerged as a prominent strategy, with nanocarriers such as nanoparticles and liposomes being employed to augment stability and bioavailability of peptides, as extensively discussed in this review. These carriers serve the crucial function of safeguarding peptides against enzymatic degradation while also enabling a sustained release, thus extending the therapeutic impact. Additionally, this review delves into mucoadhesive polymers and permeation enhancers, which have undergone extensive exploration to enhance nasal retention and augment the transportation of peptides across the nasal mucosa. Recent breakthroughs in nasal peptide delivery have heralded a new era in peptide-based therapies. These advancements encompass innovative formulation technologies, the utilization of nanocarriers, permeation enhancers, and the integration of intelligent materials and nasal drug delivery devices, all of which are geared towards enhancing the efficiency and efficacy of nasal peptide delivery