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Search Results: 1 - 10 of 317480 matches for " Tiwari N K "
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Study of Intermolecular Interactions in Liquid Crystals: Para-butyl-p’-cyano-biphenyl  [PDF]
K. K. Dwivedi, M. K. Dwivedi, S. N. Tiwari
Journal of Crystallization Process and Technology (JCPT) , 2014, DOI: 10.4236/jcpt.2014.41005

Various characteristics of mesomorphism can be explained using intermolecular interactions between a pair of liquid crystalline molecules. The intermolecular interactions have been calculated considering multipole-multicentere expansion method and modified by second order perturbation treatments. For calculation of multipole i.e. charge, dipole, etc. at each atomic center of molecules, para-butyl-p’-cyano-biphenyl, GAMESS, an ab initio program, with 6-31G* basis set has been used. The stacking, in-plane and terminal interaction energies explain the liquid crystalline behaviour of the system.

Investigation and Analysis of Indian Power Grid after Regulatory Reforms & Dynamic Pricing
Ibraheem,N K Sharma,Prabhakar Tiwari
International Journal of Engineering Science and Technology , 2010,
Abstract: Indian power system is now a national grid with 156GW of grid capacity and approximately 19.5GW of captive generation. It has passed the horrible operation phase of last decade of the twentieth century. Though the growth rate of capacity is still trying to chase the growth rate of the load since very long but the operation and control of the system has became smooth. The obvious credit goes to restructuring and concurrent regulations encouraging discipline in the operation and control of the system. In the process of transformation structural as well as policy both the types of amendments played their role. A new kind of environment is created in the system through the new tariff structure referred as Availability Based Tariff and competition is created opening the way for furthergrowth of the system to initiate activities suitable to well developed power markets. This paper investigates into operation of the grid in the light of performance indices of the power systems after regulatory reforms and restructuring at the central as well as state level.
Evaluation of Cotyledonary Node of Clitoria ternatea L. for High Frequency in vitro Axillary Shoot Proliferation
J. Singh,K.N. Tiwari
Asian Journal of Plant Sciences , 2010,
Abstract: The objective of this study was to establish mass multiplication protocol for Clitoria ternatea. An efficient protocol for in vitro propagation of the valuable medicinal and forage plant aparajita (Clitoria ternatea L.) was developed through axillary shoot proliferation. Cotyledonary node having cotyledons or devoid of cotyledons were evaluated for axillary shoot development. The effect of cytokinins, sucrose concentrations and light-dark condition on axillary shoot regeneration was investigated. Cotyledonary node with cotyledons cultured on MS medium supplemented with 1.5 mg L-1 BAP yielded the maximum number (10.8) of shoots per explant. All media supplemented with 3% sucrose and incubated under 16 h light condition found most suitable for high frequency axillary shoot proliferation. Elongated shoots produced profuse rooting after transfer to half-strength MS medium supplemented with 0.2 mg L-1 IBA. The rooted plantlets were successfully acclimatized and exhibited 95% survival after transfer into the field. This protocol is suitable for large scale production of plantlets of C. ternatea.
Removal of Malathion from Aqueous Solutions and Waste Water Using Fly Ash  [PDF]
Vinay K. Singh, Ravi S. Singh, Prem N. Tiwari, Jai K. Singh, Fethiye Gode, Yogesh C. Sharma
Journal of Water Resource and Protection (JWARP) , 2010, DOI: 10.4236/jwarp.2010.24037
Abstract: Fly ash, obtained from a thermal power plant, Anpara, Sonebhadra, India has been used as an effective ad-sorbent for the removal of malathion from aqueous solutions. The time required to attain equilibrium was found to increase from 40 to 60 minutes as the initial malathion concentration increases from 1 to 10 mg/L. The optimum pH value for adsorption was 4.50. The removal of malathion increased by increasing the tem-perature indicating endothermic nature of removal process. The fly ash exhibited first order rate kinetics and followed both Langmuir and Freundlich isotherm models. Endothermic nature of adsorption process was further supported from increasing values of Langmuir and Freundlich constants with increase in temperature. The adsorbent can be used as an economical product for the removal of malathion from wastewater also. A comparison of the adsorption capacity of fly ash with other adsorbents shows that fly ash can be used for the removal of malathion from aqueous solutions.
Shape Recognition of Shallow Buried Metallic Objects at X-Band Using Ann and Image Analysis Techniques
Dharmendra Singh;N. K. Choudhary;K. C. Tiwari;Rajendra Prasad
PIER B , 2009, DOI: 10.2528/PIERB09010301
Abstract: A robust algorithm has been developed for improving the backscattered signal and recognizing the shape of the shallow buried metallic object using Artificial Neural Network (ANN) and image analysis techniques for remote sensing at X-band. An ANN with image analysis technique based on tangent analysis is proposed to recognize the shape of metallic buried objects and minimize the orientation effect of buried object. The experimental setup has been assembled for detecting the buried metallic objects of any size at different depths in the sand pit. The system uses only one pyramidal horn antenna for transmitting and receiving microwave signals at X-band (10.0 GHz). All the data to be processed by this algorithm has been received by moving the transmitter/receiver to different locations at a single frequency in X-band in the far field region. ANN technique has been found to be very efficient. An effective training technique has been used to improve the effectiveness of the algorithm. The retrieved result of shape is in good agreement with original shape.
Related fixed point theorems on two complete and compact metric spaces
R. K. Namdeo,N. K. Tiwari,B. Fisher,Kenan Ta?
International Journal of Mathematics and Mathematical Sciences , 1998, DOI: 10.1155/s0161171298000775
Abstract: A new related fixed point theorem on two complete metric spaces is obtained. A generalization is given for two compact metric spaces.
Gunther′s Disease
Gupta Somesh,Gupta Usha,Tiwari N K,Saraswat P K
Indian Journal of Dermatology , 1998,
Abstract: A three year old female child of Gunthera€ s disease with blistering over exposed parts of body, mutilation of nose and fingers, scanning alopecia and erythrodontia, is reported. Her urine was strongly positive for uropoprhyrinogen. The blistering could not be prevented by strict avoidance of sun, sunscreen with high SPF, chloroquine, high doses of activated charcoal and betacarotene, though there was significant symptomatic improvement by repeated packed erythrocyte transfusion.
Prevention of Voltage Instability by Using FACTS Controllers in Power Systems: A Literature Survey
Bindeshwar Singh,N. K. Sharma,A. N. Tiwari
International Journal of Engineering Science and Technology , 2010,
Abstract: This paper presents exhaustive review of various concept of voltage instability, main causes of voltage instability, classification of voltage stability, dynamic and static voltage stability analysis techniques, modeling, shortcomings, in power systems environments. It also reviews various current techniques/methods for analysis of voltage stability in power systems through all over world. Authors strongly believe that this survey article will be very much useful to the researchers for finding out the relevant references in the field of voltage instability in power system environments.
A Study on Enhancement of Loadability of Large-Scale Emerging Power Systems by Using FACTS Controllers
Bindeshwar Singh,,N. K. Sharma,,A. N. Tiwari
International Journal on Computer Science and Engineering , 2010,
Abstract: This study presents comprehensive review of various methods/techniques for incorporation of differential algebraic equations (DAE) model of FACTS controllers and different type of loads such as a static, dynamic, and composite load model in large-scale emerging power systems for enhancement of loadability ofpower system networks. It also reviews various current techniques/methods for incorporation differential algebraic equations (DAE) model of FACTS controllers and different type of loads such as static, dynamic, and composite load model in emerging power system networks through all over world. Authors strongly believe that thissurvey article will be very much useful to the researchers for finding out the relevant references in the field of incorporation of FACTS controllers in power system environments for enhancement of loadability of power system environments.
Clomiphene Citrate Induces ROS-Mediated Apoptosis in Mammalian Oocytes  [PDF]
Shail K. Chaube, Tulsidas G. Shrivastav, Shilpa Prasad, Meenakshi Tiwari, Anima Tripathi, Ashutosh N. Pandey, Karuppanan V. Premkumar
Open Journal of Apoptosis (OJApo) , 2014, DOI: 10.4236/ojapo.2014.33006
Abstract: The clomiphene citrate (CC), a nonsteroidal triphenylethylene compound, is a first line of medicine used for the induction of ovulation in anovulatory women worldwide. In spite of high ovulation induction with the use of CC, the pregnancy rate is much lower. Such a discrepancy could be due to the peripheral anti-estrogenic effect of CC, particularly at the level of ovary, endometrium and cervical mucus. CC induces ovulation by binding to the estrogen receptors and generates hypoestrogrnic state in hypothalamus leading to release of pituitary gonadotropins. CC may have a direct effect at the level of ovary but the molecular mechanism remains unclear. Animal studies suggest that the CC induces apoptosis in granulosa cells and results hypoestrogenic state in the ovary. Reduced estradiol 17β level in the ovary affects development and maturation of oocyte leading to oocyte apoptosis. Further, CC increases hydrogen peroxide (H2O2) level and thereby bax protein expression and DNA fragmentation in cumulus-granulosa cells as well as in oocytes. The exogenous supplementation of either estradiol 17β or melatonin reduces H2O2 level in ovary, delays meiotic cell cycle progression in oocyte and protects oocyte apoptosis. Hence, supplementation of estradiol 17β or melatonin along with CC could be beneficial to protect granulosa cell as well as oocyte apoptosis and inhibit deterioration of oocyte quality. Thus, maintenance of oocyte quality may overcome the adverse effect caused due to CC treatment during infertility management.
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