Structural and Magnetic Characterizations of Co2FeGa/SiO2 Nanoparticles Prepared via Chemical Route

We report the synthesis of Co2FeGa/SiO2 nanoparticles by sol-gel method and characterization using x-ray diffraction (XRD), transmission electron microscopy (TEM) and magnetic measurements. The Rietveld refinements of XRD data with space group Fm-3m clearly show the formation of A2 disorder single phase and the lattice constant is found to be 5.738 {\AA}. The energy-dispersive x-ray spectroscopy (EDX) confirm the elemental composition close the desired values. The value of coercivity is found to be around 283 Oe and 126 Oe, measured at 10 K and 300 K, respectively. We observed the saturation magnetization significantly lower than expected from Slater-Pauling rule. This decrease in the magnetic moment might be due to the presence of amorphous SiO2 during the synthesis process. A large content of small size SiO2 particles along with Co2FeGa nanoparticles are also found in TEM study.Comment: 4 pages, AIP conferenc

Marketing Efficiency of Dairy Products for Co-operative and Private Dairy Plants in Tamil Nadu - A Comparative Analysis

The marketing of milk and milk products by dairy plants of co-operative and private sectors in Tamil Nadu has been compared. The study is based on the data collected for toned milk, standardized milk, full cream milk, flavoured milk, butter and ghee from the selected co-operative and private dairy plants of the Coimbatore district for the financial year 2001-2002. It has been found that the marketing cost for toned milk is same in both the dairy plants , whereas it is higher for standardized milk, full cream milk and flavoured milk in the co-operative dairy plant. The marketing cost has been found less in the cooperative plant for products like butter and ghee . All the dairy products earn more marketing margins in the private than co-operative dairy plant, except for toned milk .The marketing efficiency of cooperative dairy plant for all dairy products has been observed relatively less than that of private dairy plant, except toned milk .The study has suggested the development of co-operative dairy industry in a sustainable manner, the co-operative dairy plants should formulate long-term vision and strategy. The study has observed that value addition in dairy products should be done without compromising the quality and consumer-oriented market research and development should be accorded greater attention .Marketing,

Growth and Characterization of Fe0.95Se0.6Te0.4 Single Crystal

In this paper we present the single crystal growth of Fe0.95Se0.6Te0.4 high TC superconducting sample by the modified Bridgman technique. The x-ray diffraction pattern shows the single crystal nature of the sample, as only (00l) peaks are detectable. The stoichiometric composition has been verified by energy dispersive x-ray analysis. The superconducting transition temperature at 14 K was confirmed through DC magnetization (ZFC-FC) and resistivity measurements. By analyzing the isothermal M-H curves, we determined the value of H_c1 (0) ~360 Oe by extrapolating the data. The temperature coefficient of resistivity obtained using the power law fitting was found to be 0.6. The obtained Raman spectra at room temperature can be interpreted with the tetragonal crystal structure and space group P4/nmm.Comment: conference pape

Comparison between Routing Technologies of Wireless Sensor Networks

WSNs have crafted new prospects across the field of human activities, embracing monitoring and control of environmental systems, animal tracking, forest fire tracking, medical care, battlefield surveillance, calamity management. These different applications involves data collection from different millions of sensors and propagating to base stations via sink nodes. WSN makes this communication possible by forwarding data directly to base station that exhaust energy reserves. Use of multi-hop data transmission reduces loss of energy and increase lifetime of network. This paper discusses various routing techniques used in multi-hop WSN to select best path

DESIGN OF ORDER RELEASE MONITORING SYSTEM USING AUTOMATIC DATA CAPTURE BARCODE BASED TO IMPROVE THE ACCURACY OF DATA AND THE RESPONSE OF PROBLEMS AT MACHINING MPM INDONESIAN AEROSPACE .Ltd

ABSTRAKSI: Indonesian Aerospace. Ltd is one of the manufacturing company in Indonesia which is engaged in the manufacture of aircraft design, development and manufacture of civil and military aircraft. The execution order process of aircraft components at MPM Machining Department Indonesian Aerospace. Ltd start after production planning activity. There are problems that occur at the shop floor that causes the delivery order delays. The response to the problems at the shop floor is often come late so that incidents delays of delivery order is frequently occur. During this time, data of status order in the company is not accurate because the data retrieval process is done manually. In this research is designed a improvement system with visual management approach that supported by an integrated system barcode based to improve the accuracy of the data and the response to the problems that occur in the shop floor. The improvement system is designed with AIDC infrastructure, data needed as input, and process improvement. The infrastructure needed consist of barcode as tools of AIDC technology, computer devices, integrated network connection, LCD monitor, and integrated database system. The data needed consist of JID, employee id, machine, completion status, and problem status. The process improvement to support this system are process of order execution and process of reporting problem.KATA KUNCI: Visual Management, Order release, AIDC, Monitoring, Barcode, AndonABSTRACT: Indonesian Aerospace. Ltd is one of the manufacturing company in Indonesia which is engaged in the manufacture of aircraft design, development and manufacture of civil and military aircraft. The execution order process of aircraft components at MPM Machining Department Indonesian Aerospace. Ltd start after production planning activity. There are problems that occur at the shop floor that causes the delivery order delays. The response to the problems at the shop floor is often come late so that incidents delays of delivery order is frequently occur. During this time, data of status order in the company is not accurate because the data retrieval process is done manually. In this research is designed a improvement system with visual management approach that supported by an integrated system barcode based to improve the accuracy of the data and the response to the problems that occur in the shop floor. The improvement system is designed with AIDC infrastructure, data needed as input, and process improvement. The infrastructure needed consist of barcode as tools of AIDC technology, computer devices, integrated network connection, LCD monitor, and integrated database system. The data needed consist of JID, employee id, machine, completion status, and problem status. The process improvement to support this system are process of order execution and process of reporting problem.KEYWORD: Visual Management, Order release, AIDC, Monitoring, Barcode, Ando

Medium Access Control Protocols for Wireless Sensor Networks: A Study

Wireless Sensor Networks (WSN) is an interconnection of different sensor nodes deployed over geographical areas to communicate with each other and guiding the information of target to base station via sensor and sink nodes [1]. For exploiting the prospective benefits of WSNs requires a high-level of self-organization into a multi-hop wireless network, proficiency and coordination among the sensors to accomplish the jobs required to upkeep the underlying application. For multi-hop wireless network to work requires neighboring sensor nodes to communicate with each other through air in form of electromagnetic signal. All sensor nodes must share this common transmission medium in aunbiased and rational manner. This paper discusses the overview and fundamental design issue of Medium Access Protocol used in shared medium

Exploring the possibility of enhancing the figure-of-merit ( >> 2) of Na0.74_{0.74}CoO2_{2}: A combined experimental and theoretical study

Search of new thermoelectric (TE) materials with high \textit{figure-of-merit} (ZT) is always inspired the researcher in TE field. Here, we present a combined experimental and theoretical study of TE properties of Na$_{0.74}$CoO$_{2}$ compound in high-temperature region. The experimental Seebeck coefficient (S) is found to vary from 64 to 118 $\mu$V/K in the temperature range $300-620$ K. The positive values of S are indicating the dominating p-type behaviour of the compound. The observed value of thermal conductivity ($\kappa$) is $\sim$ 2.2 W/m-K at 300 K. In the temperature region $300-430$ K, the value of $\kappa$ increases up to $\sim$ 2.6 W/m-K and then decreases slowly till 620 K with the corresponding value of $\sim$ 2.4 W/m-K. We have also carried out the theoretical calculations and the best matching between experimental and calculated values of transport properties are observed in spin-polarized calculation within DFT+\textit{U} by chosen \textit{U} = 4 eV. The maximum calculated value of ZT is found to be $\sim$ 0.67 at 1200 K for p-type conduction. Our computational study suggests that the possibility of n-type behaviour of the compound which can lead to a large value of ZT at higher temperature region. Electron doping of $\sim$ 5.1$\times$10$^{20}$ cm$^{-3}$ is expected to give rise the high ZT value of $\sim$ 2.7 at 1200 K. Using these temperature-dependent ZT values, we have calculated the maximum possible values of efficiency ($\eta$) of thermoelectric generator (TEG) made by p and n-type Na$_{0.74}$CoO$_{2}$. The present study suggests that one can get the efficiency of a TE cell as high as $\sim$ 11$\%$ when the cold and hot end temperature are fixed at 300 K and 1200 K, respectively. Such high values of ZT and efficiency suggest that Na$_{0.74}$CoO$_{2}$ can be used as a potential candidate for high-temperature TE applications