We show that the Raman scattering technique can give complete structural information for one-dimensional systems, such as carbon nanotubes. Resonant confocal micro-Raman spectroscopy of an (n,m) individual single-wall nanotube makes it possible to assign its chirality uniquely by measuring one radial breathing mode frequency omega(RBM) and using the theory of resonant transitions. A unique chirality assignment can be made for both metallic and semiconducting nanotubes of diameter d(t), using the parameters gamma(0) = 2.9 eV and omega(RBM) = 248/d(t). For example, the strong RBM intensity observed at 156 cm(-1) for 785 nm laser excitation is assigned to the (13,10) metallic chiral nanotube on a Si/SiO2 surface.

Structural (n,m) determination of isolated single wall carbon nanotubes by resonant Raman scattering

Raman spectroscopy is one of the most extensively employed methods for the characterization of carbon nanotubes. In this review article, an overview about Raman spectroscopy as a tool for the characterization of functionalized single-walled carbon nanotubes (SWCNTs) is given. First, the relevant Raman modes in SWCNTs are introduced. Then, in a phenomenological approach, the effects that are observed for the individual modes in the Raman spectra are compiled and discussed. It is shown that special care has to be taken in order to separate the effects of functionalization, which are specific to a subset of the SWCNTs (metallic/semiconducting or diameter dependent), from changes in sample morphology or doping effects. Copyright © 2007 John Wiley & Sons, Ltd.

Raman spectroscopy of covalently functionalized single‐wall carbon nanotubes

Encyclopedia of the Sciences of Learning

Information systems strategic alignment---the fit between business strategic orientation and information systems (IS) strategic orientation---is an important concept. This study measured business strategic orientation, IS strategic orientation, and IS strategic alignment, and investigated their implications for perceived IS effectiveness and business performance. Analyses of data gathered in a mail survey of North American financial services and manufacturing firms indicated that 1) business strategic orientation, IS strategic orientation, and IS strategic alignment are modeled best by utilizing holistic, ‘systems’ approaches instead of dimension-specific, ‘bivariate’ approaches, 2) three generic IS strategic orientations can be detected, 3) user information satisfaction does not capture important strategic aspects of IS effectiveness, 4) IS strategic alignment is a better predictor of IS effectiveness than is strategic orientation, and 5) business strategic orientation, IS strategic alignment, and IS effectiveness have positive impacts on business performance.

Business strategic orientation, information systems strategic orientation, and strategic alignment : working paper

This article reviews recent advances on the use of Raman spectroscopy to study and characterize carbon nanostructures. It starts with a brief survey of Raman spectroscopy of graphene and carbon nanotubes, followed by recent developments in the field. Various novel topics, including Stokes–anti-Stokes correlation, tip-enhanced Raman spectroscopy in two dimensions, phonon coherence, and high-pressure and shielding effects, are presented. Some consequences for other fields—quantum optics, near-field electromagnetism, archeology, materials and soil sciences—are discussed. The review ends with a discussion of new perspectives on Raman spectroscopy of carbon nanostructures, including how this technique can contribute to the development of biotechnological applications and nanotoxicology.

Raman Studies of Carbon Nanostructures

Charge transfer due to chemical doping in carbon nanotubes can be detected through changes in the ba nd shape and spectral shifts of the Raman G-band. In d ouble wall carbon nanotubes, the inner tube is well prote cted from the environment and contributions of the inner tube to the Raman G-band can be detected when applying hydrostatic pressure. We find that by combining doping with sul furic acid and high hydrostatic pressure, we can determin e the ratio of single to double wall carbon nanotubes and we propose empirical parameters to fit the G-band line shape. We observe a spectral band at 1560 cm -1 which shifts with pressure at the same rate as the outer tube and whi ch attribute to electronic coupling of the two tube wa lls.

Chemical doping by sulfuric acid in double wall carbon nanotubes

Latency of read and write operations is an important measure in relational and non-relational databases. Load balancing is one of the features that manages the distribution of the load between nodes in case of distributed servers to improve the overall performance. In this paper, we introduce a new load balancer to HBase (a nonrelation database), which monitors the most requested keys and dynamically acts to redistribute the regions by splitting and moving them. Our load balancer takes into account the average response time of clients’ requests and the most requested keys. Our method is fully implemented and can be integrated in HBase distribution. Experimental results show that we get on average an improvement of latency of 15%, and up to 35% in some scenarios.

User-based Load Balancer in HBase.

Social networking apps like WhatsApp are very useful for the learning process as they enable the students to experience a new learning environment during and after the class. Specifically, WhatsApp has an amazing feature to create private groups for bounding the participant. The use of WhatsApp on university campuses enables students to be in touch with study updates. By using WhatsApp, students can contact their class fellows at any time and share data in text, image, video and audio formats. Students can help each other to complete course work including assignments, presentations, and group projects. WhatsApp makes communication easy between students to students and students to teachers. By using WhatsApp's, friendly and familiar interface teachers can run their lectures online and students can achieve their learning goals. Motivated by WhatsApp feature set, the main purpose of this research is to explore the learning outcomes achieved by students when using WhatsApp in a class group chats

Means to Support the Ends: Forums that Escape the Official Gaze in the Educational Institutions

Information technology has become a tangible and influential reality in various areas of our scientific and practical lives. Its multiple uses carry out beneficial acts while harmful behaviours can...

Revocation of Emirati citizenship due to committing cybercrimes

Consumers are increasingly shifting their purchase patterns from in-store to online. Consequently, retailers have had to go online to remain competitive. Research pundits argued the success of going online lies in the website's ability to create and maintain relationships with customers. This research aimed at investigating the relationship development process from the perspective of merchants to point out independent variables that influence such relation. The study is picking on the dyadic nature of the interaction in building relationship among people and apply it to the online relationships. In particular, the role of self-disclosure and privacy for enhancing this relationship was investigated. A deductive thematic approach was used based on a predefined themes informed by the literature guided the information collection through a semi-structured interview with eCommerce website owners. The study offers useful insights in establishing the pathway to creating and maintaining a loyal customer through a framework with propositions that are useful for eCommerce website managers.

https://www.igi-global.com/ViewTitle.aspx?TitleId=317411&isxn=9781668479056

Ahmad Ghandour

Papers

Chemical doping by sulfuric acid in double wall carbon nanotubes

User-based Load Balancer in HBase.

Means to Support the Ends: Forums that Escape the Official Gaze in the Educational Institutions

Revocation of Emirati citizenship due to committing cybercrimes

A Framework for Relationships in eCommerce Websites