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Search Results: 1 - 10 of 1768 matches for " Alok Tiwari "
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People’s Aspirations from Smart City Technologies: What Solutions They Have to Offer for the Crucial Challenges City of Jeddah Is Facing  [PDF]
Mohammed Aljoufie, Alok Tiwari
Current Urban Studies (CUS) , 2017, DOI: 10.4236/cus.2017.54026
Abstract:
Saudi Arabian urban society is faced with critical challenges such as environmental degradation, unsustainable resource consumption, inadequate public transportation, lack of walkable and bike friendly urban neighbourhoods that are hampering general conditions of liveability and wellbeing. In response to these challenges, legislators planned 6 economic cities that are metonym of smart cities, intended to economic diversification and transformation towards a knowledge based economy with the private sector partnership (PPP) and foreign direct investment (FDI). These “smart” or “economic” cities are anticipated to fascinate people to live and work in. This exploratory study was intended to understand people’s aspirations on smart city technologies that can solve urban challenges in Saudi Arabia. A total of 351 samples from the online survey, were analysed. We conclude that people in Saudi Arabia are optimistic about smart city benefits; they are also excitedly willing to contribute in smart city planning and management. We also suggest policymakers to adopt a collaborative planning mechanism based on people’s wisdom to tackle more wicked urban problems and added benefits of ICT (Information & communication technologies) and geospatial technologies.
A review on challenges in synthesis of YFe2O4 multiferroics and their possible solution in comparison to BiFeO3
Alok Tiwari, Apurwa Agrawal
Chemistry Internatioanl , 2016,
Abstract: The synthesis of YFe2O4 (YFO) is challenging because of high oxygen stoichiometry, it is a possible origin to realize the series of different phases at low temperature, balance of competing interaction between ions (Fe2+ and Fe3+) gives multiphase. The ionic radius of octahedral Fe-O which include, octahedral Fe-O inter atomic distances determined are for from the one expected for Fe2+ and Fe3+ octahedral ions and weak magnetic behavior and the transition temperature (250 K) also needs some improvement. These are the some difficulties, which were found during the synthesis of both room temperature multiferroics, which could be resolve by taking some major steps involves. The synthesis of multiferroic material can be improved by reducing its particle size, changing morphology by substitutional doping etc.
Beyond Geographical and Cultural Barriers: The Concept of a Virtual Gallery for Arts, Design & Architecture Schools in Saudi Arabia  [PDF]
Abeer Alawad, Mohammed Aljoufie, Alok Tiwari, Lamya Daghestani
Art and Design Review (ADR) , 2015, DOI: 10.4236/adr.2015.34012
Abstract: The aim of this paper is to examine the advantages and disadvantages of a virtual gallery as a substitute for the Saudi Arabian schools of higher education in Arts, Design & Architecture which frequently organise exhibitions. Virtual galleries provide new opportunities for architects, designers, artists and experts of other disciplines to lay foundation for new social networks. These networks may establish interdisciplinary knowledge collaborations beyond global geographical barriers. Additionally, it will be an excellent opportunity for students at Saudi Arabian universities to lower the cultural barriers that separate male and female students. Virtual galleries can enrich students’ learning, enhance professional skills and also offer savings in term of practical costs (time, money and efforts) required to visit physical exhibitions.
A basis-set based Fortran program to solve the Gross-Pitaevskii Equation for dilute Bose gases in harmonic and anharmonic traps
Rakesh P. Tiwari,Alok Shukla
Physics , 2006, DOI: 10.1016/j.cpc.2005.10.014
Abstract: Inhomogeneous boson systems, such as the dilute gases of integral spin atoms in low-temperature magnetic traps, are believed to be well described by the Gross-Pitaevskii equation (GPE). GPE is a nonlinear Schroedinger equation which describes the order parameter of such systems at the mean field level. In the present work, we describe a Fortran 90 computer program developed by us, which solves the GPE using a basis set expansion technique. In this technique, the condensate wave function (order parameter) is expanded in terms of the solutions of the simple-harmonic oscillator (SHO) characterizing the atomic trap. Additionally, the same approach is also used to solve the problems in which the trap is weakly anharmonic, and the anharmonic potential can be expressed as a polynomial in the position operators x, y, and z. The resulting eigenvalue problem is solved iteratively using either the self-consistent-field (SCF) approach, or the imaginary time steepest-descent (SD) approach. Our results for harmonic traps are also compared with those published by other authors using different numerical approaches, and excellent agreement is obtained. GPE is also solved for a few anharmonic potentials, and the influence of anharmonicity on the condensate is discussed. Additionally, the notion of Shannon entropy for the condensate wave function is defined and studied as a function of the number of particles in the trap. It is demonstrated numerically that the entropy increases with the particle number in a monotonic way.
Primary Extra-Gastrointestinal Stromal Tumor (GIST) arising from mesentery of small bowel and presenting as abdominal mass: A rare entity  [PDF]
Alok Kumar Tiwari, Anil Kumar Choudhary, Hemant Khowal, Poras Chaudhary, Mohinder P. Arora
Open Journal of Gastroenterology (OJGas) , 2013, DOI: 10.4236/ojgas.2013.35045
Abstract: Introduction: Majority of mesenchymal tumors of gastrointestinal tract are Gastrointestinal Stromal Tumor (GIST). It is, however, a rare tumor, accounting for less than 1% of primary gastrointestinal (GI) neoplasms. Though, these tumors are refractory to conventional chemotherapy or radiotherapy but show a good response to targeted adjuvant chemotherapy with tyrosine kinase inhibitors following surgical resection. Case Report: we report here a case of primary Extra-GIST tumor arising from mesentry of small bowel near duodeno-jejunal junction in a 69 years old male patient. The patient presented with a palpable mass in upper abdomen for past 15 days. On examination, a non-tender mobile lump of size around 17 × 10 cm, with bosselated surface and firm in consistency was palpable involving epigastric, left hypochondrium and umbilical region. Contrast enhanced computed tomography of abdomen revealed a heterogenous mesentric mass. On surgical intervention a mass was found involving mesentery near dudenojejunal junction without involvement of gastrointestinal tract. Complete surgical resection of the tumor was done and adjuvant chemotherapy with Imatinib mesylate was started as HPE revealing GIST with mitotic index of >10/50 HPF and 17 × 10 cm size placed the patient in high risk category. Patient was discharged on 12th of post-operative day with advice of regular follow-up. Conclusion: GIST occurrence is not restricted to bowel but can involve unusual sites also. The mainstay of treatment remains surgical resection with adequate margin. In cases where tumour has malignant potential (high mitotic figures on histopathology) adjuvent treatment with tyrosine kinase may prevent or delay relapse.
Functional outcome following quadriceps tendon lengthening in congenital dislocation of the knee, with special reference to extensor weakness
Alok Sud,Aashish Chaudhry,Anil Mehtani,Akshay Tiwari,Deep Sharma
Strategies in Trauma and Limb Reconstruction , 2009, DOI: 10.1007/s11751-009-0072-1
Abstract: This study reports the incidence and proposes a probable cause of flexion deformity and extensor weakness following lengthening of quadriceps tendon for the congenital dislocation of the knee and also proposes a modification of the functional grading given in the literature to this effect. Seventeen knees in ten patients were treated with a follow-up from 3 to 8 years. Fifteen knees were grade III and were operated with quadriceps lengthening and anterior capsulotomy. Two knees were Grade II and were initially closed reduced, but operated later due to recurrence. The results were graded on a modification of functional grading system given in the literature [1]. There were excellent results in four, good in five and fair in eight knees. There was an extensor weakness in ten knees (average 12.2°) and flexion deformity (15°) in one. Eight patients could squat and all started walking independently by 10–20 months of age, except one. V-lengthening of the quadriceps tendon produced a satisfactory improvement in the knee function. The theoretical role of the gastrocnemius and hamstring muscles in abetting flexion deformity and extensor weakness is suggested.
A Survey of Energy Efficient Routing Protocols for Mobile Ad-hoc Networks
Ajit Singh, Harshit Tiwari,,Alok Vajpayee,,Shiva Prakash
International Journal on Computer Science and Engineering , 2010,
Abstract: This paper presents a survey on energy efficient routing protocols for wireless Ad-Hoc networks. Survey focus on recent development and modifications in this widely used field. This discussion is centred on proposed power saving algorithms. Besides it we will discuss about the conventional protocols and also see how these are modified to make theseprotocols energy efficient and what the shortcomings that have been resolved.
On the Development of High Power DC-DC Step-Down Converter with Energy Recovery Snubber
Alok Singh,Mangesh B. Borage,Sunil R. Tiwari,A. C. Thakurta
Advances in Power Electronics , 2012, DOI: 10.1155/2012/806738
Abstract: The effect of switching losses on the efficiency of a switch mode power converter and methods adopted for its improvement using an energy recovery lossless snubber has been presented. A comparative analysis of various types of soft switching techniques along with effects of dissipative and nondissipative snubbers on efficiency of the converter has been carried out before zeroing in on the selected scheme. The selected snubber serves the dual function of a turn-on and turn-off snubber and thereby reducing the switching losses both during turn-on and turn-off transients, resulting in improved efficiency of the converter. A detailed design procedure of the snubber for high-power applications taking into account various effects such as diode reverse recovery, diode voltage stress, and minimum and maximum duty cycle limits, has been presented in this paper. Importance of practical aspects in layout to minimize wiring inductance is also highlighted. A high-power prototype of buck converter has been developed to experimentally validate the theoretical design and analytical observations. 1. Introduction Switch mode power supplies are popular because of higher efficiency, smaller size, and lighter weight [1, 2]. Low weight and smaller size comes about because operation is significantly at a higher frequency range, and thus the magnetic components are quite smaller in size and weight [3]. High switching frequencies in turn results in large switching losses and stresses in power device because during the turn-on and turn-off transients the power device has to withstand high voltage and current simultaneously [4, 5]. Large and transitions also induces significant amount of electromagnetic interference (EMI) in the circuit which in turn pollute the utility systems [6]. This problem, if left unattended, may result in lower efficiency and larger size of converters owing to increased size of the heat sinks and EMI filters. Efforts are made in order to alleviate the aforementioned limitations and to enable operation at still higher frequencies while maintaining better conversion efficiency [7]. Snubbers are an essential part of power electronic systems. They are small network of passive components which forms a part of power switching circuits to reduce switching losses and stresses in power devices [8]. But, as the switching losses in the main switch are dissipated in form of heat in snubber resistors, the overall efficiency of the converter is deteriorated. Various soft switching techniques have been proposed in the literature [1, 9, 10] to obtain soft switching of
Investigation of Surface Tryptophan of Protein by Selective Excitation at 305 nm  [PDF]
Vishvanath Tiwari, Monalisa Tiwari
Journal of Biophysical Chemistry (JBPC) , 2015, DOI: 10.4236/jbpc.2015.63009
Abstract: Intrinsic fluorescence of tryptophan is a powerful tool that is used to investigate structure, dynamics, and folding-unfolding of proteins. Here, we have signified the importance of selective monitoring of “surface” tryptophans from the “buried” tryptophans in a protein via selective excitation of surface tryptophan using light of 305 nm wavelength. We have also enlightened the effect of pH and temperature on the conformation of protein by selective excitation of surface tryptophan of protein using 305 nm light. The result concludes that this novel approach could be used to investigate surface tryptophan of protein selectively at diverse conditions.
From evidence to implementation: Introducing neonatal simulation to a tertiary neonatal centre in the UK  [PDF]
Alok Sharma
Open Journal of Pediatrics (OJPed) , 2013, DOI: 10.4236/ojped.2013.31002
Abstract: Simulation training in medical education allows multidisciplinary teams to train in a realistic clinical environment. It helps reduce clinical errors and addresses patient safety issues. Multiple areas can be covered including procedural skills training, communication, teamwork and human factors training. We present a “model of simulation” in education, which is based onRoyalCollegeof Paediatrics and Child HealthUnited Kingdomgeneral paediatric curriculum. Simulation complements the existing neonatal education programme both for doctors and nurses. It has the long-term purpose of achieving higher standards in neonatal care through the training of staff in a structured, multidisciplinary environment. Its quality and impact are subject to feedback from the participants. This has helped in its evolution and development as a multidisciplinary programme.
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