Nonlinear thermal transport and negative differential thermal conductance in graphene nanoribbons

We employ classical molecular dynamics to study the nonlinear thermal transport in graphene nanoribbons (GNRs). For GNRs under large temperature biases beyond linear response regime, we have observed the onset of negative differential thermal conductance (NDTC). NDTC is tunable by varying the manner of applying the temperature biases. NDTC is reduced and eventually disappears when the length of the GNR increases. We have also observed NDTC in triangular GNRs, where NDTC exists only when the heat current is from the narrower to the wider end. These effects may be useful in nanoscale thermal managements and thermal signal processing utilizing GNRs.Comment: 5 pages, 4 figure

Continuously Variable Rotorcraft Propulsion System: Modelling and Simulation

This study explores the variable speed operation and shift response of a prototype of a two speed single path CVT rotorcraft driveline system. Here a Comprehensive Variable Speed Rotorcraft Propulsion system Modeling (CVSRPM) tool is developed and utilized to simulate the drive system dynamics in steady forward speed condition. This investigation attempts to build upon previous variable speed rotorcraft propulsion studies by: 1) Including fully nonlinear first principles based transient gas-turbine engine model 2) Including shaft flexibility 3) Incorporating a basic flight dynamics model to account for interactions with the flight control system. Through exploring the interactions between the various subsystems, this analysis provides important insight into the continuing development of variable speed rotorcraft propulsion systems

Management System for a Restaurant

The Management System for a Restaurant is a web-based application. The main aim is to provide better communication between customers and restaurants. By using this application, the user can order from any location. This application will reduce all the manual processes. So, users can view the restaurant menu from nearby locations, and can place an order and view the status of the order like cooking/packed/delivered. There are three main actors in this application: Admin, Restaurant manager and User. The admin will create all menus with their corresponding price lists. Also, the admin will be able to view statistical reports for foods. Restaurant managers will receive orders from customers. Users/Customers can place orders using this application and they will be able to view available food items. The system is designed as a 3-tier architecture. Each user must register with the system; after logging in successfully, they are able to perform operations. Separate login pages are provided for logging into the system. To develop this system, we use HTML, CSS, JavaScript, and bootstrap for the front end, MySQL database as the back end, and Java, JSP, and JDBC as middleware

Autocorrelations of characteristic polynomials for the Alternative Circular Unitary Ensemble

We find closed formulas for arbitrarily high mixed moments of characteristic polynomials of the Alternative Circular Unitary Ensemble (ACUE), as well as closed formulas for the averages of ratios of characteristic polynomials in this ensemble. A comparison is made to analogous results for the Circular Unitary Ensemble (CUE). Both moments and ratios are studied via symmetric function theory and a general formula of Borodin-Olshanski-Strahov.Comment: 16 pages. Incorporates referee suggestion

Tuning the thermal conductivity of graphene nanoribbons by edge passivation and isotope engineering: a molecular dynamics study

Using classical molecular dynamics simulation, we have studied the effect of edge-passivation by hydrogen (H-passivation) and isotope mixture (with random or supperlattice distributions) on the thermal conductivity of rectangular graphene nanoribbons (GNRs) (of several nanometers in size). We found that the thermal conductivity is considerably reduced by the edge H-passivation. We also find that the isotope mixing can reduce the thermal conductivities, with the supperlattice distribution giving rise to more reduction than the random distribution. These results can be useful in nanoscale engineering of thermal transport and heat management using GNRs.Comment: 4 pages, 4 figure

Sustainability of farming: Revisiting Resource Dependency Theory in analysing challenges with special reference to Bangalore Rural District.

Purpose: The purpose of this research is to understand the resource-based view of the resource consumption of farmers. In farming sector there is a resource scarcity in terms of labor, seeds, electricity, water etc. The labor scarcity can be managed by own family members, but the other resources are expensive and not easy to substitute. Hence, this study tries to understand the difficulties faced by farmers in overcoming resource scarcity. Design/methodology/approach: It is a descriptive analysis based on demographic data collected from farmers using a structured questionnaire, confirmed after a pilot study. Crombec alpha was used to test the validity and it is more than 0.725. The consistency was tested by using test-reset method and t- test is used to test the consistency of data. This statistically insignificant (p>0.05). Convenient sampling is used for data collection. Findings: The Research Dependency Theory helps farmers in classifying the controllable and uncontrollable variables affecting agriculture and crop production. The examination of Research Based View Model helps farmers in acumen on crop production and sustainable development. Research limitations/implications Only one District is examined and wider research is essential, both of a qualitative and quantitative nature. Originality/value The research provides empirical support for the Resource Dependency Theory and extends the kind of its implication for farmers in facing the challenges of sustainable farming

Maize Provitamin A Carotenoids, Current Resources, and Future Metabolic Engineering Challenges

Vitamin A deficiency is a serious global health problem that can be alleviated by improved nutrition. Development of cereal crops with increased provitamin A carotenoids can provide a sustainable solution to eliminating vitamin A deficiency worldwide. Maize is a model for cereals and a major staple carbohydrate source. Here, we discuss maize carotenogenesis with regard to pathway regulation, available resources, and current knowledge for improving carotenoid content and levels of provitamin A carotenoids in edible maize endosperm. This knowledge will be applied to improve the nutritional composition of related Poaceae crops. We discuss opportunities and challenges for optimizing provitamin A carotenoid biofortification of cereal food crops

Verifiable Secret Key Generation for Ranked Multi-Keyword Search in Cloud

Cloud storage is exceptionally well known in ongoing pattern as it gives more advantages over the customary storage arrangements. To guarantee security in cloud, encryption methods assume a noteworthy part when data are outsourced to the cloud. The issue of recovering the encrypted data over the cloud is mind boggling. Numerous search procedures are utilized for recovering the scrambled data from cloud. This paper axes around an arrangement of keyword Search instruments over encrypted data, which gives secured data recovery high proficiency. Search over encrypted data is a method of extraordinary enthusiasm for the cloud computing time, in light of the fact that numerous trust that delicate data must be scrambled before outsourcing to the cloud servers with a specific end goal to guarantee client data security. Concocting a productive and secure search scheme over scrambled data includes strategies from ple spaces. It presumes that, keyword search is intended to be best methodology for searching the encrypted data in the Cloud. It gives more productivity than single keyword search