Design of a selective filter - antenna with low insertion loss and high suppression stopband for WiMAX applications

This paper presents a selective quasi–elliptic bandpass filter-antenna. The presented filter-antenna has a low insertion loss in the passband and relatively high stopband rejection. This structure consists of a quasi–elliptic bandpass filter direct coupled with patch antenna. The bandpass filter consists of four (λ/4) spiral square resonators. It has operates between (3.25–3.6) GHz so it is suitable for WiMAX applications. A CST Microwave Studio Suite software has used to simulate the filter-antenna circuit. The simulated results of the patch antenna and the results of the filter-antenna appears a good matching between the two circuits

Mechanism of melting in submonolayer films of nitrogen molecules adsorbed on the basal planes of graphite

URL:http://link.aps.org/doi/10.1103/PhysRevB.52.8515 DOI:10.1103/PhysRevB.52.8515The melting mechanism in submonolayer films of N2 molecules adsorbed on the basal planes of graphite is studied using molecular-dynamics simulations. The melting is strongly correlated with the formation of vacancies in the films. As the temperature increases, the edges of the submonolayer patch become atomically rough and vacancies are first created there. Then there is an onset temperature at which the vacancies penetrate into the patch. At an intermediate region of coverages ∼0.3-0.8 commensurate layers, there is sufficient free volume for the film to melt at that temperature. At higher coverages, ∼0.8-1.0 layers, a solid with defects is formed, and additional free volume must be created by higher energy mechanisms such as layer promotion for melting to occur; thus, the melting temperature rises with coverage. In contrast, for very small patches, the atomically rough zone penetrates the entire patch at a lower temperature where the film melts. The calculated melting temperatures are significantly lower than observed experimentally, indicating a severe fault in the potential model. A possible source of the discrepancy is identified.Our work was partially supported by the National Science Foundation under Grants Nos. DMR-9314235 (H.T.) and DMR-9120199 9L.W.B.) and by the Danish Natural Science Foundation (F.Y.H.)

Conceptualization and Integration of Information Systems in Educational Business Activities

The business activities are highly incorporated with the technology development and need to be updated periodically. Business activities have made the technology to be more creative and innovative. The organizations need to integrate their business activities into a single system to achieve their aims and objectives successfully. Various studies are already conducted in integrating such business activities as Business Process Management System. In particular, various management systems are available in the market to integrate the educational business processes. The educational business processes are changing due to the various international bench markings. The educational business processes perspectives could not be met exactly to the requirements in some of the available software. As the currently available systems suits to some of the educational institutions in particular region of the world, there are needs to review them to the current requirements. This paper identifies the gaps between the current potential educational requirements and availability of educational business processes management systems. The major impact factors of the educational processes are identified and based on the findings a model has been proposed

Instructor’s Performance:A Proposed Model for Online Evaluation

Currently due to high awareness and quality audits, the higher education institutions have made to keep a track on various performances of the institutions. One such most important activity that has to be analyzed and evaluated is Instructor’s classroom performance. As the students are the main stakeholders of the educational process, their concerns over the instructor, teaching pedagogies and methodologies, assessment techniques need to be collected and analyzed for achieving the institution’s goals and objectives. The students shall give their opinions related to the various performance indicators of instructor.In general, the higher education institutions use various techniques to evaluate instructor’s performance in the classroom from the students. The latest technological developments help in data collection using web technologies. Online system with required questionnaire and attributes will help the higher education institutions in easy data collection. Apart from that the students shall give their opinions without any fear from any place and at any time. In this paper, we have identified the major factors and users of an instructor online evaluation system. Also, we have proposed a model for such system with subsystem interface, entity relationship diagram and context diagram

Beyond Limits: Envisioning Sustainable Design and Production Ecosystems

The use of sustainability is of utmost importance when it comes to tackling the environmental issues that our global community is currently confronting, ranging from climate change to the depletion of natural resources. The publication titled “Beyond Limits: Envisioning Sustainable Design and Production Ecosystems” delves into the imperative need for a paradigm shift in order to effectively address the aforementioned difficulties. This paradigm shift necessitates a break from conventional, sequential frameworks towards circular and regenerative systems, signifying a fundamental shift in our design and production methodologies. The concept of sustainable design and production ecosystems is intrinsically characterised by its complex nature. The dimensions encompassed by these practises are broad, encompassing the reimagining of design processes, the careful selection of materials, the optimisation of production procedures, the rethinking of supply chain management, and the consideration of end-of-life scenarios. Each of these characteristics plays a crucial role in establishing a comprehensive and enduring environment. The fundamental objective of this notion is to develop a state of peaceful coexistence between human activities and the ecosystems of the earth. In addition to the reduction of harm, it promotes active engagement in activities that contribute to the overall welfare of our environment. By exploring this paradigm-shifting perspective, we establish the foundation for a forthcoming era in which human pursuits harmoniously integrate with the ecological systems of the Earth, ensuring a sustainable and wealthy global community for future generations