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Search Results: 1 - 10 of 22979 matches for " Rakesh Kumar Yadav "
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Al - BASED CAST COMPOSITES
Rakesh Kumar Yadav,Ashu Yadav
International Journal of Computer Science and Management Studies , 2011,
Abstract: The economy is very important feature nowadays in themarket. The researches are playing an important role inengineering field to increase the life of machine parts /components and decrease the cost. The compositematerials have the potential to replace widely used steeland aluminium due to their good characteristics withbetter performance. The Al-based composites have foundextensive applications in automobile industries andaerospace industries due to their increased stiffness,strength, thermal conductivity and wear resistanceproperties. A number of particulate phases have beenemployed in the Al-alloy matrix. The cast aluminiumceramicparticulate composites are finding applications inpistons, connecting rods, cylinder liner, engine cylinderblock, electrical contacts etc.The present investigation isbased on study of the effect of particulate phase on theSEM study, micro-hardness, elastic modulus, tensilestrength and the wear behaviour of Al-5 % SiC-7 % Fe,Al-10 % SiC-6 % Fe and Al-15 % SiC-5 % Fe composites.
Pytoremediation of fluoroquinolone group of antibiotics from waste water  [PDF]
Shalini A. Tandon, Rakesh Kumar, Suman A. Yadav
Natural Science (NS) , 2013, DOI: 10.4236/ns.2013.512A004
Abstract:

The study involved selection of wetland plant species hyper efficient in removing fluoroquinolone group of antibiotics so that they can be used in a constructed wetland system patented by NEERI, India (European Patent Office (EPO) Pub. No.: WO2004087584) or any other constructed wetland. Phyto removal of these antibiotics at such high concentrations without any toxic effect on the plant species is very useful as incomplete removal of certain antibiotics such as Ciprofloxacin, and Ofloxacin from waste waters is of concern due to their health effects if they do persist in finished waters even at ng/l levels. Five different wetland plant species which were also tested for their efficiency to treat municipal wastewater were used to test their efficiency to scavenge commonly used fluoroquinolone antibiotics (which are not degraded easily) namely Ciprofloxacin, Gemifloxacin mesylate, Ofloxacin and Gatifloxacin from aqueous medium (Hoagland-Arnon solution). EC double beam UV-VIS spectrophotometer was used to obtain lambda max of Ciprofloxacin, Gemifloxacin mesylate, Ofloxacin and Gatifloxacin in Hoagland-Arnon solution. The most efficient plant species for each antibiotic were selected and tested again for confirmation of antibiotic removal efficiency at a high concentration of 50 mg/l of each antibiotic. Taxodium distichum was found to be the most suitable for the removal of Ofloxacin, Gatifloxacin and Ciprofloxacin showing maximum removal of 32 mg/l (on 6th day), 21 mg/l (on 8th day), 32 mg/l (on 9th day), respectively and Canna indica was found to be the most suitable for removal of Gemifloxacin mesylate showing maximum removal of 38 mg/l (on 8th day).

A fresh loom for Multilevel feedback Queue scheduling Algorithm
Rakesh Kumar Yadav,Anurag Upadhyay
International Journal of Advances in Engineering Sciences , 2012,
Abstract: CPU scheduling is a vital phenomenon of operating system. At present, numerous CPU scheduling algorithms are existing like FCFS(First come first serve), SJF (shortest job first),SRTF( Shortest remaining time first) , Priority Scheduling,(RR)Round Robin scheduling , MLQ( multilevel queue). Efficiency and performance are not remaining satisfactory of these algorithms. MLFQ( Multilevel feedback queue) be one of most potential strategies, for CPU scheduling .It is further extension of multi-level queue scheduling algorithm while multilevel queue scheduling is results of combination of basic scheduling algorithms such as FCFS and RR scheduling algorithm. Therefore, research on these algorithms remains continuing till today. This paper, suggested a novel approach which will improve the performance of MLFQ (CPU) scheduling algorithm.
Analysis of Sliding Window Protocol for Connected Node
Dr. Kapil Kumar Bansal,Rakesh Kumar Yadav
International Journal of Soft Computing & Engineering , 2012,
Abstract: - In conventional networks lack of reliable and efficient transmission of data over unreliable channels that can lose, reorder and duplicate messages due to router or receiver limited buffer space, are retransmitted by the source. These scenarios usually data blocks contain error detection codes to detect whether an error has occurred during data transmission or not. If an error is detected, the receiver can try to fix the error if the received data has enough redundant bits or request a retransmission of data, for fulfill this requirement sliding window protocol is use. This paper shows calculated link utilization is better than observed link utilization for sliding window protocol using Deft Netz2.0 network simulation.Index Terms-- Network, Congestion, Buffer, Simulation, Bandwidth, Reliable, Efficient, Netz2.0.
A Fuzzy Based Approach to Detect Black hole Attack
Poonam Yadav,Rakesh Kumar Gill,Naveen Kumar
International Journal of Soft Computing & Engineering , 2012,
Abstract: A Wireless network is a dynamic network with large no. of nodes. As the traffic increases over the network such type of network suffers from the problems like congestion and packet loss. But in case of Mobile network there is one more problem regarding the life of the network. A network can be affected from some Black hole attack over the network As a result some loss of information occur over the communication. The packet loss is acceptable up to some threshold value but as there is more packet loss we need some solution for this. The same solution is presented in this paper. Here we are presenting a fuzzy based decision to check a node is infected by Black hole attack or node. The proposed system will identify the attack over the node as well as provide the solution to reduce the data loss over the network
A comparative evaluation of dentin caries removal with polymer bur and conventional burs—An in vitro study  [PDF]
Vijay Kumar Shakya, Anil Chandra, Aseem Prakash Tikku, Promila Verma, Rakesh Kumar Yadav
Open Journal of Stomatology (OJST) , 2012, DOI: 10.4236/ojst.2012.21002
Abstract: Aim: To evaluate the comparative efficacy of Polymer bur (Smartprep) and Conventional burs (Carbide bur & Diamond Points) in selective Dentin caries removal. Materials and method: 15 freshly extracted carious human premolars and molars were selected for this study. These teeth were split in the center of carious lesion, in order to obtain two corresponding half. Thus 30 samples were prepared in this way. These were randomly divided in to 3 groups of 10 samples each. Group 1: The carious portion of these samples was excavated with the help of polymer bur Smartprep (SS White). Group 3: Prepared with Tungsten carbide round bur (No. 018). Group 3: Prepared with the help of Diamond points (No. 018). The period of time involved in this process is measured. After excavation of all carious lesions, a longitudinal section from mid most part of lesion was obtain with the help of diamond disc at slow speed. After staining with caries detector dye “Seek”, the sections were subjected to histological evaluation under stereomicro-scope. The thickness of remaining caries is measured in more or less than 1 mm. Results: The difference in grading of remaining carious dentin between Polymer bur and Conventional burs were statistically non- significant, but Polymer bur taken more time in comparison to Conventional burs. Conclusion: Smartprep bur is more conservative in selectively dentin caries removal than Conventional burs but same time it is more time consuming than Conventional burs.
Synthesis and Biological Activity of Peptide Derivatives of Iodoquinazolinones/Nitroimidazoles
Rajiv Dahiya,Anil Kumar,Rakesh Yadav
Molecules , 2008, DOI: 10.3390/molecules13040958
Abstract: Two substituted quinazolinyl/imidazolyl-salicylic acids 5, 6 were synthesized bythe reaction of 6-iodo-2-methylbenzoxazin-4-one/5-nitroimidazole with 5-aminosalicylicacid (5-ASA). Coupling of compounds 5 and 6 with different amino acid esterhydrochlorides, dipeptide and tripeptide methyl esters yielded novelquinazolino/imidazolopeptide derivatives 5a-f and 6a-g. The chemical structures of allnewly synthesized compounds were confirmed by means of FT-IR, 1H- and 13C-NMR, MSand elemental analysis. Selected peptide ester derivatives were further hydrolyzed by usinglithium hydroxide (LiOH) to afford the corresponding acid derivatives 5ba-da and 6ea-ga.All peptide derivatives were assayed for antimicrobial and anthelmintic activities againsteight pathogenic microbes and three earthworm species. Among the tested compounds, 5e,5d, 6e and their hydrolyzed analogs 5da and 6ea exhibited higher antimicrobial activityagainst Pseudomonas aeruginosa, Klebsiella pneumoniae and Candida albicans, and 5a,6g and 6ga displayed better antifungal activity against the dermatophytes Trichophytonmentagrophytes and Microsporum audouinii. Moreover, 6f and its hydrolyzed derivative6fa showed good anthelmintic activity against Megascoplex konkanensis, Pontoscotexcorethruses and Eudrilus eugeniea at dose of 2 mg mL–1.
Performance Evaluation of FD-SOI MOSFETS for Different Metal Gate Work Function
Deepesh Ranka,Ashwani K. Rana,Rakesh Kumar Yadav,Kamalesh Yadav
International Journal of VLSI Design & Communication Systems , 2011,
Abstract: FULLY DEPLETED (FD) SILICON ON INSULATOR (SOI) METAL OXIDE FIELD EFFECT TRANSISTOR (MOSFET) ISTHE LEADING CONTENDER FOR SUB 65NM REGIME. THIS PAPER PRESENTS A STUDY OF EFFECTS OF WORKFUNCTIONS OF METAL GATE ON THE PERFORMANCE OF FD-SOI MOSFET. SENTAURUS TCAD SIMULATIONTOOL IS USED TO INVESTIGATE THE EFFECT OF WORK FUNCTION OF GATES ON THE PERFORMANCE FD-SOIMOSFET. SPECIFIC CHANNEL LENGTH OF THE DEVICE THAT HAD BEEN CONCENTRATED IS 25NM. FROMSIMULATION WE OBSERVED THAT BY CHANGING THE WORK FUNCTION OF THE METAL GATES OF FD-SOIMOSFET WE CAN CHANGE THE THRESHOLD VOLTAGE. HENCE BY USING THIS TECHNIQUE WE CAN SET THEAPPROPRIATE THRESHOLD VOLTAGE OF FD-SOI MOSFET AT SAME VOLTAGE AND WE CAN DECREASE THELEAKAGE CURRENT, GATE TUNNELLING CURRENT AND SHORT CHANNEL EFFECTS AND INCREASE DRIVECURRENT.
Modified route-maintenance in AODV Routing protocol using static nodes in realistic mobility model
Rakesh kumar,,Siddharth Kumar,,Sumit Pratap Pradhan,,Varun Yadav
International Journal on Computer Science and Engineering , 2011,
Abstract: One of the popular wireless network architectures is Mobile Ad Hoc Network (MANET). It can be easily deployed in every environment, without any underlying backbone and infrastructure support. MANET is a wireless network that consists of nodes which are mobile in nature. Each node in the network acts as a router which provides the flexibility to the topology of the network. In this paper, an extended AODV routing protocol is proposed for Ad-hoc networks which typically suits to resolve the realistic model problems. This proposed protocol may improve the performance of regular AODV routingprotocol. It has all the features of AODV routing protocol, as it follows all the steps of the route discovery algorithm of AODV routing protocol. The main difference arises when it comes to the route maintenance approach. We assume that the network is also consist of the static nodes, which helps to recover the path while route maintenance. An assumption reveals that it may increase the efficiency of regular AODV routing protocol in terms of the metrics: Endto- end delay, Packets dropped, Routing overhead.
Analysis of Si/SiGe Heterostructure Solar Cell
Ashish Kumar Singh,Jahnvi Tiwari,Ashish Yadav,Rakesh Kumar Jha
Journal of Energy , 2014, DOI: 10.1155/2014/946406
Abstract: Sunlight is the largest source of carbon-neutral energy. Large amount of energy, about 4.3 × 1020?J/hr (Lewis, 2005), is radiated because of nuclear fusion reaction by sun, but it is unfortunate that it is not exploited to its maximum level. Various photovoltaic researches are ongoing to find low cost, and highly efficient solar cell to fulfil looming energy crisis around the globe. Thin film solar cell along with enhanced absorption property will be the best, so combination of SiGe alloy is considered. The paper presented here consists of a numerical model of heterostructure solar cell. The research has investigated characteristics such as short circuit current density ( ), generation rate ( ), absorption coefficient (α), and open circuit voltage ( ) with optimal Ge concentration. The addition of Ge content to Si layer will affect the property of material and can be calculated with the use of Vegard’s law. Due to this, short circuit current density increases. 1. Introduction The development of new energy sources is continuously being enhanced because of the critical situation of the nonrenewable resources. Thus, the renewable energy sources have become a more important contributor to the total energy consumed in the world. Sun provides enormous amounts of energy, powering oceans as well as atmospheric currents and cycle of evaporation. Electricity from solar energy is one of the most unprecedented cost effective methods of electricity production. Japan is leading with 64% electricity production using photovoltaic solar cell as shown in Figure 1. The solar cells have considerably reduced the cost/watt of produced electricity by a factor of 5–10 to compete with fossil and nuclear electricity and by a factor of 25–50 to compete with primary fossil energy [1]. Therefore, solar energy is one of the attractive types of renewable sources of energy replacing fossil fuels due to its profusion. In fact, the demand for solar energy has increased over the past 20 years. The market for PV systems is growing worldwide. In fact, nowadays, solar PV provides around 4800?GW. The sun continuously supplies about 1.2 × 1025 [1] terawatts of energy which is greater than any other renewable or nonrenewable sources of energy. Solar cell is generally constructed using crystalline silicon (c-Si) which has absolutely low absorption coefficient because of its indirect band structure; therefore, it is less preferable for solar technology. Here alloy of SiGe is considered due to its low energy band gap and increase in absorption coefficient as compared to Si. Figure 2 shows the
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