Distinguishing quantum dot-like localized states from quantum well-like extended states across the exciton emission line in a quantum well

We have closely examined the emission spectrum at the heavy-hole exciton resonance in a high-quality GaAs multi-quantum well (MQW) sample using picosecond excitation-correlation photoluminescence (ECPL) spectroscopy. Dynamics of the ECPL signal at low and high energy sides of the excitonic photoluminescence (PL) peak shows complementary behavior. The ECPL signal is positive (negative) below (above) the PL peak and it changes sign within a narrow band of energy lying between excitonic absorption and emission peaks. The energy at which this sign change takes place is interpreted as the excitonic mobility edge as it separates localized excitons in quantum dot-like states from mobile excitons in quantum well-like states.Comment: 12 pages, 4 figure

Constraints in adoption of composite carp culture in central Brahmaputra valley zone of Assam - a perceptual framework

The study was conducted in Nagaon district under central Brahmaputra valley zone of Assam to find out the perceptual constraints of the fish farmers in adoption of composite carp culture practice. A representative sample of 60 fish farmers of the district was selected using random sampling. The levels of agreement of respondents in relation to 32 identified constraints in adoption of composite fish culture were determined using 5 point Likert scale. The mean value of degree of responsiveness to constraints was analyzed to find out the perception of the farmers and found lack of fish feed at cheaper rate (3.45) as major constraint followed by high initial cost of digging of ponds (3.28). Seven factors of constraints have been identified through factor analysis such as extension support system constraints, knowledge constraints, financial constraints,distribution constraints, infrastructural constraints, agro-climatic constraints and situational constraints. With the constraints as perceived by the farmers, some relevant strategies have been suggested such as integrated effort to provide better quality fish seed at proper time at pond site of farmers through judicious carp breeding and hatchery management and proper distribution system; strengthening research extension linkage; organizing need based short and long-term training programme and on farm demonstration programme on various aspects of fish culture practices both for farmers and extension workers; establishment of ‘One stop Aqua Shop’(OAS) as single outlet in strategic locations to make available all inputs required for fish culture; formation of fish producer’s consortium to provide a dependable market support and a suitable delivery system for providing inputs to the fish farmers in time and better provision of institutional credit

The Long-Baseline Neutrino Experiment: Exploring Fundamental Symmetries of the Universe

The preponderance of matter over antimatter in the early Universe, the dynamics of the supernova bursts that produced the heavy elements necessary for life and whether protons eventually decay --- these mysteries at the forefront of particle physics and astrophysics are key to understanding the early evolution of our Universe, its current state and its eventual fate. The Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed plan for a world-class experiment dedicated to addressing these questions. LBNE is conceived around three central components: (1) a new, high-intensity neutrino source generated from a megawatt-class proton accelerator at Fermi National Accelerator Laboratory, (2) a near neutrino detector just downstream of the source, and (3) a massive liquid argon time-projection chamber deployed as a far detector deep underground at the Sanford Underground Research Facility. This facility, located at the site of the former Homestake Mine in Lead, South Dakota, is approximately 1,300 km from the neutrino source at Fermilab -- a distance (baseline) that delivers optimal sensitivity to neutrino charge-parity symmetry violation and mass ordering effects. This ambitious yet cost-effective design incorporates scalability and flexibility and can accommodate a variety of upgrades and contributions. With its exceptional combination of experimental configuration, technical capabilities, and potential for transformative discoveries, LBNE promises to be a vital facility for the field of particle physics worldwide, providing physicists from around the globe with opportunities to collaborate in a twenty to thirty year program of exciting science. In this document we provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess.Comment: Major update of previous version. This is the reference document for LBNE science program and current status. Chapters 1, 3, and 9 provide a comprehensive overview of LBNE's scientific objectives, its place in the landscape of neutrino physics worldwide, the technologies it will incorporate and the capabilities it will possess. 288 pages, 116 figure

Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks

无线传感器网络，作为全球未来十大技术之一，集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术，可实时感知、采集、处理、传输网络分布区域内的各种信息数据，在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议，并针对大规模的无线传感器网络设计了一种树状路由协议，它根据节点地址信息来形成路由，从而简化了复杂繁冗的路由表查找和维护，节省了不必要的开销，提高了路由效率，实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR（AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位：工学硕士院系专业：信息科学与技术学院通信工程系_通信与信息系统学号：2332007115216

21st DAE-BRNS High Energy Physics Symposium 2014

The DAE-BRNS High Energy Physics Symposium is a conference series held every other year in India, supported by the Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy (DAE), India. The symposium is considered as one of the premiere symposiums organized in India in the field of elementary particle physics. Around 350 physicists and researchers are expected to participate in this symposium to discuss the latest advancements in the fields of particle physics, astro-particle physics, cosmology, development of new detector technology and accelerator. The XXI edition of the DAE-BRNS High Energy Physics Symposium will be held in the picturesque campus of the Indian Institute of Technology Guwahati during 8 – 12 December, 2014

HISTOPATHOLOGICAL EXAMINATION WITH CLINICORADIOLOGICAL CORRELATION IN THE DIAGNOSIS OF BONE TUMOURS AND TUMOUR-LIKE LESIONS- A HOSPITAL-BASED STUDY

BACKGROUND Bony lesions are diverse in form and differ in their gross and histopathological features. The key to accurate recognition of bone tumours is utilisation of an integrated approach involving clinical data, radiological and histopathological findings. The aim of the study is to study the incidence of bone tumours and tumour-like lesions in relation to age and gender among the patients by doing histopathological examination and by doing correlation between pathological diagnosis and clinicoradiological diagnosis. MATERIALS AND METHODS The study included 97 patients in between August 2014 to July 2015 with clinical and radiological suspicion of primary and secondary tumours and tumour-like lesions of bone, which require biopsy or surgical excision from the Department of Orthopaedics, Gauhati Medical College and Hospital, Guwahati. The tissues were received and evaluated for histopathological examination in the Department of Pathology, Gauhati Medical College and Hospital, Guwahati. RESULTS The lesions were found in the age range of 3 to 65 years. Benign tumours of bone were more common tumours than malignant tumours. Out of the 97 cases, 94 cases were diagnosed as bone tumours and tumour-like lesions. Out of the total 94 cases, osteosarcoma (24.47%) and giant cell tumours of bone (20.21%) are most common bone tumours amongst malignant and benign tumours, respectively. CONCLUSION Histopathological diagnosis have a superior role in the diagnosis of bone lesions as confirmed diagnosis can be given, which when correlated with clinical and radiological findings helps the clinicians to take the correct decision for proper management

Repellent activity of Vitex negundo and Curcuma longa herbal extract against Simulium species in India

Background & objectives: At present, use of synthetic pesticides to manage insects and other arthropods creates a number of issues that are related to the environment and public health. The goal of the present study is to find repellent activity of Vitex negundo and Curcuma longa herbal extracts against the wild species Simulium (blackfly) bite. Methods: We have studied Simulium biting behavior and tested the repellency of herbal extract obtained from Vitex negundo L. (Lamiales: Lamiaceae) and Curcuma longa L. (Zingiberal: Zingiberaceae) along with their essential oils in three locations in Arunachal Pradesh, India on human volunteers’ resistance to Simulium (blackflies). The reported herbal extracts were incorporated to topical drug delivery vehicle as a cream and gel. Results: The methanolic extract of Vitex negundo cream and gel formulation showed >2 h safety at 5% concentration and >5 h safety at 10% concentration in all the testing sites followed by ethyl acetate extract. Whereas, chloroform extract of Curcuma longa cream and gel formulation provided >1 h safety at 5% concentration and >4 h safety at 10% concentration. Interpretation & conclusion: At an optimum concentration of 10%, the methanolic extract of Vitex negundo cream provided complete protection times (CPTs) 320.4, 358.6, and 346.4 min, respectively. These findings offer confirmation of the methanolic extract and chloroform extract potential for use in new blackfly repellents

A Brief Review on Topical Gels as Drug Delivery System

The method of applying prescription dosage forms to the skin for direct treatment of a cutaneous disorder is known as a topical drug delivery system. Topical gels are semisolid dosage forms in which a liquid phase is constrained within a three-dimensional polymeric matrix derived from natural or semi-synthetic sources with high physical or chemical cross-linking. Because of their intermediate behavior between solid and liquid materials, topical gels are an excellent candidate for transdermal drug delivery. Clinical evidence indicates that topical gel is a safe and effective treatment choice for the management of skin-related diseases, especially when used for local action to avoid the side effects of other conventional dosage forms. Gels, cream, ointment, and paste are the most commonly used semi-solid formulations for topical drug delivery. Gels are colloids in which the liquid medium has thickened to the extent that it behaves like a solid. Since topical gel formulations are less greasy and can be quickly removed from the skin, they offer better drug delivery. In comparison to cream, ointment, and paste, gel formulations have improved application properties and consistency. This article aims to review the principles and recent developments in topical gels, including classification, methods of preparation, applications, and so on.</jats:p

Study on the effect of hydrogen addition on the variation of plasma parameters of argon-oxygen magnetron glow discharge for synthesis of TiO2 films

We report the effect of hydrogen addition on plasma parameters of argon-oxygen magnetron glow discharge plasma in the synthesis of H-doped TiO2 films. The parameters of the hydrogen-added Ar/O2 plasma influence the properties and the structural phases of the deposited TiO2 film. Therefore, the variation of plasma parameters such as electron temperature (Te), electron density (ne), ion density (ni), degree of ionization of Ar and degree of dissociation of H2 as a function of hydrogen content in the discharge is studied. Langmuir probe and Optical emission spectroscopy are used to characterize the plasma. On the basis of the different reactions in the gas phase of the magnetron discharge, the variation of plasma parameters and sputtering rate are explained. It is observed that the electron and heavy ion density decline with gradual addition of hydrogen in the discharge. Hydrogen addition significantly changes the degree of ionization of Ar which influences the structural phases of the TiO2 film