Bionanomaterials from plant viruses

Plant virus capsids have emerged as useful biotemplates for material synthesis. All plant virus capsids are assembled with high-precision, three-dimensional structures providing nanoscale architectures that are highly monodisperse, can be produced in large quantities and that cannot replicate in mammalian cells (so are safe). Such exceptional characteristics make plant viruses strong candidates for application as biotemplates for novel and new material synthesis

Templated mineralization by charge-modified cowpea mosaic virus

Templated mineralization of virus particles provides routes to narrowly dispersed nanoparticles that are not readily prepared by other means. The templated mineralization of metal or metal oxide on the external surface of wild-type cowpea mosaic virus (CPMV), a plant virus, is facilitated by increasing the external surface negative charge. This is achieved by the chemical modification of surface lysine groups by succinic anhydride. Hence, for example, treatment of charge-modified CPMV succinamate with a 1:2 mixture of iron(II) and iron(III) salts, followed by raising the pH to 10.2, led to the formation of narrowly dispersed, CPMV-templated, magnetite (Fe3O4) nanoparticles

Polyelectrolyte-modified cowpea mosaic virus for the synthesis of gold nanoparticles

Polyelectrolyte surface-modified cowpea mosaic virus (CPMV) can be used for the templated synthesis of narrowly dispersed gold nanoparticles. Cationic polyelectrolyte, poly(allylamine) hydrochloride, is electrostatically bound to the external surface of the virus capsid. The polyelectrolyte-coated CPMV promotes adsorption of aqueous gold hydroxide anionic species, prepared from gold(III) chloride and potassium carbonate, that are easily reduced to form CPMV-templated gold nanoparticles. The process is simple and environmentally benign using only water as solvent at ambient temperature

Synchrotron radiation in a chromo-magnetic field

We study the generalization of QED synchrotron radiation to the QCD case with a chromomagnetic field using the Schwinger {\it et al} source method. It is shown that the QED case can be obtained as a special limit. The comparison with the path integral approach of Zakharov has shown consistent results.Comment: Accepted for publication in Phys. Rev.

Evaluation study of IEEE 1609.4 performance for safety and non-safety messages dissemination

The IEEE 1609.4 was developed to support multi-channel operation and channel switching procedure in order to provide both safety and non-safety vehicular applications. However, this protocol has some drawback because it does not make efficient usage of channel bandwidth resources for single radio WAVE devices and suffer from high bounded delay and lost packet especially for large-scale networks in terms of the number of active nodes. This paper evaluates IEEE 1609.4 multi-channel protocol performance for safety and non-safety application and compare it with the IEEE 802.11p single channel protocol. Multi-channel and single channel protocols are analyzed in different environments to investigate their performance. By relying on a realistic dataset and using OMNeT++ simulation tool as network simulator, SUMO as traffic simulator and coupling them by employing Veins framework. Performance evaluation results show that the delay of single channel protocol IEEE 802.11p has been degraded 36% compared with multi-channel protocol

Four points bend fixture bone plate

Volume 2 Issue 5 (May 2014

Effect of Renewable Energy and Electric Vehicles on Smart Grid

Global electricity demands are increasing at rapid pace. Energy supply, their usage and technologies involved need to be more economical, environment friendly and socially sustainable. Efforts are being done all over the globe to reduce this green house effect; and renewable energy technologies to combat climate changes, which require extensive changes to the current electricity generation and distribution systems. To meet this goal, it is required to optimize the grid operations and available resources to meet the ever increasing energy demands in an efficient, effective and environment sustainable way. So strong and huge interests on smart grid have increased extensively in recent years around the world. This scenario could be a promising reason for future research in this area. This next form of electricity grid will be able to manage various parts of power production from power plants to the customers. Renewable energy sources appear strongly in smart grid so in this paper the effect of this sources will be studied also electric vehicles have a great effect on smart grid infrastructure ,communication and control this paper will discuss this effect if it come from the electric vehicle mode or vehicle to grid mode

The Effect of Dividend Policy on Market Value UK Empirical Study

This study tackles the relationship between dividend policy and market value of companies in the UK through three empirical models. The aim of the first model was to test the validity of the Irrelevant Theory empirically by exploring the relationship between dividend type (cash dividend, share dividend and share repurchase), earnings (EPS) and investment policy (retained earnings per share) with the market value of a company. This is achieved through the use of annual and semi-annual data for 362 companies in different UK sectors by adopting Panel Data for the period extending from 1998 to 2007 (twenty periods), where the fixed-effect (within) regression model was used to examine this sample . The second model examines if companies favour the investment policy dividend policy by investigating whether or not companies follow a residual dividends policy. This has been identified by following the methodology of Baker and Smith (2006), based on the calculation of Standardized Free Cash Flow (SFCF) for 590 UK companies in different sectors for the period from 1998 to 2007 by using annual data. The third model seeks to explore managerial preferences regarding dividend type and the most important factors affecting the company management when setting dividends policy. In this respect, the importance of the following factors has been tested: the company’s market value; the financing decision; the investment decision; signaling theory; agency theory; and shareholder structure. The questionnaire methodology used for this model where it was distributed to 1319 UK companies in different sectors. The number of responses was 208 responses is equivalent to 15.77% of the total distributed). The study arrived at a number of important results that can be summarized as follows: 1) The invalidity of the Irrelevant Theory, as the results show that there is a relationship between dividend policy and market value of a company; 2) There is a relationship between earnings, investment policy and the market value, which indicates that the dividends policy, announced earnings and investment policy work together in affecting the market value of a company; 3) UK companies, on the whole, do not adopt a residual dividends policy, implying no preference for investment policy over dividend policy, except for the two sectors banking and insurance companies where the results showed that they follow the residuals dividends policy 4) Most UK companies’ managements prefer cash dividends to other venues choices because of its easy implementation; and 5) The most important factor affecting UK companies’ managements when they set their dividends policy is shareholder structure while the least factor listed in importance is agency theory