Characteristics of FeCuAl Powder Compacts Sintered at Different Schedules

This paper presents the characteristics of FeCuAl powder compacts formed through uniaxial die compaction process and sintered at different schedules. Elemental iron, copper, and aluminum powders were blended mechanically and the blended powder mass was subsequently compacted at..

Fractal Yagi-Uda antenna for WLAN applications

This paper describes the development of a Fractal printed Yagi-Uda antenna for Wireless Local Area Network (WLAN) applications operating at 2.4 GHz frequency. In miniaturizing the dimensions of an antenna, fractal method is applied where the 1st iteration and 2nd iteration is implemented. The Computer Simulation Technology (CST) software is used as the platform to design and simulate the antenna. The substrate material used is the FR-4 board which has a dielectric constant of 5.4, the thickness of 1.6mm and tangent loss of 0.019. The antenna performance interm of the reflection coefficient, radiation pattern and gain are compared and analyzed. For the 1st iteration, 22.81% of reduction size has been achieved and 30.81% reduction of the antenna size for 2nd iteration has been achieved

Video monitoring application using wireless sensor node with various external antenna

Surveillance and monitoring has become very important for security reasons these days. The use of wireless sensor node device offers a variety of platform depends on the attached sensor. When an image sensor is attached, the wireless sensor node is capable of monitoring an area wirelessly. Since wireless environment uses antenna to transmit and receive data, antenna is an important component that affects the video monitoring performance. This paper describes a surveillance system using Raspberry Pi with various external antenna. The Raspberry Pi with Pi Camera module and various types of antennas was used for testing and experimentation in line-of-sight (LOS) and non-line-of-sight (NLOS) condition. The results revealed that the Yagi Uda antenna gives the best output in terms of its signal strength and average Receive (Rx) rate

Process involved in designing of an intelligent additional track mechanism tracked vehicle for swamp peat terrain

Different types of off road vehicles are widely used in agriculture, oil industry, mining and military operations but none of them can effectively operate over the swamp peat terrain because of its low bearing capacity of 7kN/m 2. Segmented rubber tracked vehicle and intelligent air-cushion system tracked vehicle were developed in Malaysia for swamp peat terrain.16kN/m2 of ground pressure was exerted by using the segmented rubber tracked vehicle during field operation therefore could not be operated efficiently. The air-cushion tracked vehicle increased the floatation capacity but at the same time increased the frictional effects therefore the tracks of the vehicle easily slipped out from the traction wheels during operation. Addressing these issues an intelligent additional track mechanism for tracked vehicle has been designed to improve the mobility over swamp peat terrain where the additional track would be increased the ground surface area and reduced the vehicle ground pressure. This paper presents the process involved in designing the intelligent additional track mechanism tracked vehicle for transportation of agricultural and industrial goods on the swamp peat terrain with bearing capacity of 7kN/m2. The mechanical design comprises of track vehicle frame with track mechanism. Additional track mechanism with Fuzzy expert system. The design parameters are optimized using developed mathematical model based on the dynamics and kinematics behavior of the vehicle. In order to increase the vehicle contact surface area and reduce the surface contact pressure the additional track mechanism is designed in such way that it can be folded and unfolded from its position by using the ball-screw scissor lift mechanism. While, Fuzzy expert system is used to control the movement of the lift mechanism based on 70mm critical sinkage of vehicle detected from a set of sensors. The completed to vehicle system would be used for off-road applications as required

When dermatomyositis patient has blurring of vision – what goes wrong?

Cytomegalovirus (CMV) retinitis occurs predominantly in Human Immunodeficiency Virus (HIV) -infected patients. It was also reported in HIV-seronegative patients with systemic autoimmune disorder requiring systemic immunosuppression, organ or bone marrow transplantation, haematological or breast malignancy receiving chemotherapy, ocular diseases following intraocular or periocular corticosteroid injection, diabetes mellitus and Good syndrome. However, CMV retinitis in patients with concurrent dermatomyositis and malignancy has not been previously reported. It has not been reported in cancer other than haematological or breast malignancy, or in cancer patient prior to chemotherapy. We report a case of 40-year-old HIV-seronegative woman with underlying dermatomyositis and lung malignancy who developed right CMV retinitis which relapsed after recommencement of immunosuppressant. Both episodes of CMV retinitis were successfully treated after taken her immunocompromised state into consideration

Synthèse et étude de complexes de ruthénium bipyridiniques fonctionnalisés par des groupes acide phosphonique pour l'élaboration de cellules photovoltaïques

Communication par affiche (présentée par H. Zabri

Design of molecular dyes for application in photoelectrochemical and electrochromic devices based on nanocrystalline metal oxide semiconductors.

This review describes the work which has mainly been developed in our laboratory on photoelectrochemical solar cells and on electrochemical devices in which suitable dyes are used for light harvesting and interfacial electron transfer processes with nanocrystalline wide band-gap semiconductors. A summary of results obtained over the last ten years in the field of supramolecular photochemistry at semiconductor interfaces is presented. A particular attention is given to the design and characterization of coordination compounds that can be integrated into semiconductor devices and to the present status of research on this new generation of photovoltaic and electrochromic devices. These studies provide a general molecular approach for the controlled conversion of light into an electrical response and thus have potential applications in solar devices, displays, sensors. electrochromic, and other molecular photonic devices

Synthesis and Comprehensive Characterizations of New cis-RuL2X2 (X ) Cl, CN, and NCS) Sensitizers for Nanocrystalline TiO2 Solar Cell Using Bis-Phosphonated Bipyridine Ligands (L)

The preparation and the properties of several ruthenium complexes of the general formula cis-RuL2X2 with L ) 2,2¢-bipyridine-4,4¢-bisphosphonic acid, L¢ ) 2,2¢-bipyridine-5,5¢-bisphosphonic acid, and X ) Cl, CN, or NCS are reported. The synthesis of these complexes relies on the preparation of the key intermediates cis-Ru(bipyridinebis- (diethyl ester phosphonate))Cl2. The ground-state second pKa values of the thiocyanato complexes were determined and are 6.0 and 6.1 for cis-RuL2(NCS)2 and for cis-RuL¢2(NCS)2, respectively. For these species, 13C NMR and IR demonstrate that the thiocyanato ligands are bound to Ru via the N atom. The new complexes exhibit a blueshifted electronic absorption spectrum with respect to the analogous complexes containing carboxylic acid groups. Density functional theory molecular orbital calculations show that the LUMO of the bipyridine phosphonated ligands is at higher energy than the corresponding dicarboxylate complexes and that the thiocyanato ligands are not simple spectator ligands, whose role is to enrich electron density on the ruthenium, but are also involved in transitions from ¦*Ru-NCS to ¦*bpy that extend the absorbance of the dye in the low energy part of the absorption spectrum. The photoaction spectra recorded in a sandwich regenerative photovoltaic cell indicate that the cyano and thiocyanato complexes containing the bipyridine substituted in 4,4¢ positions exhibit a 90-95% photoconversion efficiency on the MLCT band, whereas those containing the bipyridine substituted in 5,5¢ positions display lower efficiency (60- 65%). The most efficient complex in the series is cis-RuL2(NCS)2; however, its overall efficiency is about 30% lower than the analogue cis-Ru(H2dcb)2(NCS)2 (H2dcb ) 2,2¢-bipyridine-4,4¢-dicarboxylic acid) due to a lower absorbance in the red part of the visible spectrum

International Forum for Rural Development

Somalia's first issue of complexity is found in its relentless political crises: constant conflict in the country has led to a political and normative void and has discouraged long-term supporters of community reconstruction. The second issue of complexity is found in development strategies promoted by International Agencies, much more focused on re-establishing the state's legal and institutional structures rather then sustaining a process of construction of community social purpose shared by all clans: this feature is at the basis of political and social identity funding principles of any functioning national state. The third issue of complexity is found in defining the best policy approach in International Cooperation, in regard to beneficiaries and donors. The objective of the present report is to design a development strategies for rural areas in the actual fragile context in order to help local communities in fostering their development capacity, based on the idea of bottom-up development approach