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Cloud Computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources, (for example networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction. But it has many security issues they are Lack of trust, loss of control and multitenency. In cloud computing at IaaS Infrastructure is provided so Virtual machines are running in this level and service has been provided. SO there is one security threat is VM Migration. So for preventing this VM Migration problem one protocol is used so through that protocol this problem becomes less. At this level different VMs of different users are running on the same physical server. So another problem at this level is risk of co-resident attack, in which user of one VM can get information from another VM. So for reducing this co-resident Attack different policies are there which p...

El proposito de esta investigacion fue estudiar el efecto de los productos de combustion de emulsiones de crudo pesado sobre la aleacion 2 ¼ Cr -1Mo. Para la experimentacion se utilizo una caldera pirotubular de 100 HP en donde se colocaron la muestras por duplicado, las cuales se retiraron a las 8, 50, 124, 203, 305 y 500 horas de exposicion. Los ensayos se realizaron en funcion de la ganancia de masa respecto al tiempo, las muestras fueron analizadas mediante metalografia optica, microscopia electronica de barrido SEM-EDX, y DRX. El analisis de los resultados muestra que la sulfidacion fue el fenomeno dominante en el proceso.

FM radio transmission is greatly affected by geography. Nepal faces particular problems in relation to variations in signal reach because of its varying topography. Radio signal coverage mapping indicates service areas of radio communication transmitting stations. The objectives of this study are to map the signal coverage of local radios (Kavre district) and to assess parameters affecting FM signal strength. The primary data were GPS coordinates of FM transmission stations and bearing of antenna. The secondary data regarding frequency of station, transmitter model, transmitter power, antenna model, and height of antenna from ground level were collected from respective FM stations. For elevation data freely available SRTMv3 was used. Combined Cartesian coverage maps for each FM stations were prepared using Radio Mobile software that showed varying signal strength of station in dBμV/m. The accuracy of the maps through field validation was observed to be 85%. Assessment of parameters ...

This paper proposes a model for enhancing privacy and security in cloud computing known as the Covenant Code Exchange (CCE). The model is proposed as part of the Service Level Agreement (SLA) for cloud providers and users as well as a third party (a witness). In particular, the model we propose allows a cloud provider, user and a witness to exchange covenant codes during transactions to ensure privacy, security and accountability. The covenant code exchange (CCE) requires the code of all parties that are involved for a successful transaction. A key feature of the proposed model is that a transaction cannot be completed with the codes of all parties concerned. Our model is very efficient and effective; when compared to other models; certification, accreditation, authorization and authentication, it involves a transaction cannot be completed until all parties have exchange of covenant codes. Additionally, when there is a breach in security, all parties will be held accountable. This e...

Drug delivery technologies are an important area within biomedicine. Targeted drug delivery aims to reduce the undesired side effects of drug usage by directing or capturing the active agents near a desired site within the body. This is particularly beneficial in, for instance, cancer chemotherapy, where the side effects of general (systemic) drug administration can be severe. Herein, a numerical investigation of unsteady magnetic drug targeting (MDT) using functionalized magnetic microspheres in partly occluded blood vessels is presented considering the effects of particle-fluid coupling on the transport and capture of the magnetic particles. An Eulerian–Lagrangian technique is adopted to resolve the hemodynamic flow and the motion of the magnetic particles in the flow using ansys fluent. An implantable cylindrical permanent magnet insert is used to create the requisite magnetic field. Targeted transport of the magnetic particles in a partly occluded vessel differs distinctly from ...

Objective. It was proposed an altmetric index to identify the most consulted titles of Cuban publishers that distribute their contents on the e-Libro.com academic platform. Design/Methodology/Approach . The Wally Index is defined as the quotient of the Ln (# queries) of a title between the maximum Ln (# queries) of the set of titles evaluated in a defined period of time. The usefulness of this Index was validated from the study of the distribution of titles of six Cuban publishers that include their titles in the academic platform e-Libro.com, during the period September 2016 - August 2017. Results / Discussion. The Wally Index vs . # Titles of Cuban publishers available on e-libro.com were adjusted to the power model, with a Pearson correlation coefficient of R2 = 0.7299, although titles with smaller numbers of queries showed greater dispersion, so that evaluated this index with the collection of the 226 most consulted titles. With this sample, the Wally Index 'normalized vs . ...

Niniejszy artykuł stara się uzupełnić lukę w literaturze dotyczącej wykorzystania komunikatora Facebook Messenger jako przestrzeni organizowania pomocy w przypadku kryzysu o zasięgu międzynarodowym – jakim jest wojna w Ukrainie. Celem badania jest odpowiedź na pytanie: czy Messenger był efektywnym narzędziem do organizacji pracy grupy spontanicznie zebranych wolontariuszy w początkowej fazie tego kryzysu. Aby znaleźć odpowiedź posłużono się metodą ukrytej obserwacji uczestniczącej, kategoryzacji treści czatu oraz metody ilościowej, za pomocą której określono liczbę członków grupy i ich aktywność. Okazało się, że Facebook Messenger pozwala na wspieranie organizacji grupy i koordynację jej zadań, jednak generuje ograniczenia, wyszczególnione w tekście artykułu i nie jest narzędziem zaspokajającym wszystkie potrzeby komunikacyjne.