Physical Sciences and Engineering

We investigated in detail the methods of Lyapunov for ordinary differential equation systems and the extensions of these due to Razumikhin for delay differential equation systems. We then applied the application of some of these methods to an important general class of continuous-time algorithms for the control of antenna transmission powers in wireless networks. Here we employ appropriately constructed Lyapunov functions to show that, in the absence of time-delays, any bounded power distribution obtained from these algorithms is uniformly asymptotically stabl.

Chemistry is a important subject in science. But ,learning of chemistry in higher secondary school is difficult.

This research sought an understanding of the implementation of a stochastic approach, as applied to analysis and development of information systems to object-oriented. In order to contribute towards advancing the scope of the area called System Analysis and Development, whose focus is on modeling the view of management, execution and process engineering. From an existing template, the Unified Process, was created the diagram of transition of states graphically that represents the Markov Chain, concerned with the probability of transition between their steps.

Identity-based encryption (IBE) is a public key cryptosystem and eliminates the demands of public key infras structure (PKI) and certificate admiration in conventional public key settings .Due to the absence of PKI, the revocation problem is a critical issue in IBEs settings .Several revocable IBE schemes have been proposed regarding this issue. Quite recently, by embedding an outsourcing computation technique into IBE, Li et al. proposed a revocable IBE scheme with a key -update cloud service provider (KU-CSP). However, their scheme has two shortcomings.

Ferritin light chain (FTL) is a subunit of the ferrit in protein, which plays an essential role in intracellular iron storage. To evaluate the association of FTL gene expression and meat quality, the expression patterns of FTL in four pig breeds, Berkshire, Duroc, Landrace, and Yorkshire, were examined. The FTL mRNA expression in liver and kidney of all four breeds was noticeably higher when we compared to other tissues examined in this study.

The paper analyses the reasons for limiting the development of digital libraries and proposing appropriate solutions for the development of digital libraries in Vietnam in the current period.

The combination of hydrogel and nitrogen may favor the expression of grain productivity of wheat. The goal of the study was to analyze the nitrogen utilization efficiency in wheat through the hydrogel biopolymer, defining the optimal dose of hydrogel and nitrogen combination at the maximum grain productivity, in succession systems of high and reduced N-residual release.

Objective: This study aimed to verify the influence of differentsNd:YAG laser energy parameters on the bond strength between lithium disilicate ceramic and resin cement.

This work aims to analyze the level of awareness of the population of the city of Luziânia regarding the use and disposal of electronic waste. Through a qualitative exploratory case study, the research included bibliographical research and semi-structured interviews. Electronic junk (e-waste) is composed of materials of information technology and communication in disuse, having in its structure highly polluting substances. These materials have grown significantly with increasing population and rapid obsolescence.

Higher wheat productivitycan be obtained according tothe form of nitrogen supply. The objective of this study wasto increase the biomass and wheat grain productivitythroughthe forms of nitrogen supplyinconditions of favorable and unfavorable years,in corn/wheat and soybean/wheat succession systems.