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Search Results: 1 - 10 of 692 matches for " Parul Tyagi "
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Childhood Glaucoma: An Overview  [PDF]
Parul Singh, Yogesh Kumar, Manoj Tyagi, Krishna Kuldeep, Parmeshwari Das Sharma
Open Journal of Ophthalmology (OJOph) , 2012, DOI: 10.4236/ojoph.2012.23015
Abstract: Several types of childhood glaucoma exist, and the terminology is based on the time of onset of disease and its potential cause. Though childhood glaucoma occurs less commonly than adults but can lead to permanent visual damage due to amblyopia, optic neuropathy or refractive error. A detailed evaluation should be done to establish diagnosis. Medical therapy has a limited role and surgery remains main modality for treatment. Childhood glaucoma is a treatable disease, if early diagnosis is established and therapeutic intervention done in time. In children with low vision efforts should be there to maintain residual vision and visual rehabilitation with low vision aids should be done.
Gonioscopy: A Review  [PDF]
Parul Singh, Manoj Tyagi, Yogesh Kumar, Krishna Kuldeep, Parmeshwari Das Sharma
Open Journal of Ophthalmology (OJOph) , 2013, DOI: 10.4236/ojoph.2013.34025
Abstract:

Gonioscopy allows us to examine the angle of anterior chamber and forms part of complete ophthalmic examination and it is mandatory for the diagnosis and management of glaucoma. Gonioscopy permits the identification of eyes at risk for closure and detects angle abnormalities that could have diagnostic and therapeutic implications. Principle, types and techniques of gonioscopy, various types of gonioscopic lenses used, indications of performing gonioscopy, gonioscopic anatomy and grading are discussed in this article.

 

Xeroderma pigmentosa with ocular association: Case report  [PDF]
Achyut N. Pandey, Krishna Kuldeep, Ameeta Koul, Manoj Tyagi, Parul Singh, Parmeshwari Das Sharma, Deepak Dimri
Case Reports in Clinical Medicine (CRCM) , 2013, DOI: 10.4236/crcm.2013.28123
Abstract: Xeroderma pigmentosum is a rare, autosomal recessive disease caused by a defect in DNA repair. Patients with xeroderma pigmentosum often have cutaneous and ocular sun sensitivity, freckle-like skin pigmentation, multiple skin and eye cancers, and, in some patients, progressive neurodegeneration. Xeroderma pigmentosum predominantly affects the ultraviolet (UV) exposed ocular surface, resulting in eyelid atrophy and cancers, corneal dryness, exposure keratopathy, and conjunctival tumors. General features included parental consanguinity (40%), familiarity (60%), onset of symptoms in the first 2 years (50%), malignant skin neoplasms (60%), and carcinoma of the tongue (20%). Among the ocular features, 50% of patients presented with photophobia. Lid freckles or atrophic skin lesions were seen in all patients. Lower lid tumours were seen in 30%, chronic conjunctival congestion in 40%, corneal opacification in 40%, squamous cell carcinoma of limbus in 20%, bilateral pterygium in 40%, and visual impairment in 50%. We report the clinical history and ocular pathology of a boy who is having xeroderma pigmentosum with ocular manifestations. The ophthalmic manifestations of xeroderma pigmentosum are discussed and reviewed with respect to this report and other cases in the literature. These cases illustrate the role of DNA repair in protection of the eyes from UV damage and neuron degeneration of the retina.
Mucins: Potential for ovarian cancer biomarkers
Mohammad Sikander,Shabnam Malik,Parul Tyagi,Deepak Yadav
International Journal of Biomedical and Advance Research , 2012, DOI: 10.7439/ijbar.v3i6.526
Abstract: Mucins comprise a wide range of proteins which generally expresses at the cell surface, heavily glycosylated and functions as providing the protection to the cell membrane. It is now reported that aberrant form of mucins is generally related with the pathogenesis of a number of cancer, including ovarian cancer. This review is focuses on the role of mucin as potential biomarker for the ovarian cancer.
Argon Assisted Growth of Epitaxial Graphene on Cu(111)
Zachary R. Robinson,Parul Tyagi,Tyler R. Mowll,James B. Hannon,Carl A. Ventrice Jr
Physics , 2013, DOI: 10.1103/PhysRevB.86.235413
Abstract: The growth of graphene by catalytic decomposition of ethylene on Cu(111) in an ultra-high vacuum system was investigated with low energy electron diffraction, low energy electron microscopy, and atomic force microscopy. Attempts to form a graphene overlayer using ethylene at pressures as high as 10 mTorr and substrate temperatures as high as 900 $^\circ$C resulted in almost no graphene growth. By using an argon overpressure, the growth of epitaxial graphene on Cu(111) was achieved. The suppression of graphene growth without the use of an argon overpressure is attributed to Cu sublimation at elevated temperatures. During the initial stages of growth, a random distribution of rounded graphene islands is observed. The predominant rotational orientation of the islands is within $\pm1^\circ$ of the Cu(111) substrate lattice.
Influence of Chemisorbed Oxygen on the Growth of Graphene on Cu(100) by Chemical Vapor Deposition
Zachary R. Robinson,Eng Wen Ong,Tyler R. Mowll,Parul Tyagi,D. Kurt Gaskill,Heike Geisler,Carl A. Ventrice Jr
Physics , 2014, DOI: 10.1021/jp410142r
Abstract: Understanding the influence that copper substrate surface symmetry and oxygen impurities have on the growth of graphene by chemical vapor deposition is important for developing techniques for producing high quality graphene. Therefore, we have studied the growth of graphene by catalytic decomposition of ethylene in an ultra-high vacuum chamber on both a clean Cu(100) surface and a Cu(100) surface pre-dosed with a layer of chemisorbed oxygen. The crystal structure of the graphene films was characterized with \emph{in-situ} low energy electron diffraction. By heating the clean Cu(100) substrate from room temperature to the growth temperature in ethylene, epitaxial graphene films were formed. The crystal quality was found to depend strongly on the growth temperature. At 900 $^\circ$C, well-ordered two-domain graphene films were formed. Pre-dosing the Cu(100) surface with a chemisorbed layer of oxygen before graphene growth was found to adversely affect the crystal quality of the graphene overlayer by inducing a much higher degree of rotational disorder of the graphene grains with respect to the Cu(100) substrate. The growth morphology of the graphene islands during the initial stages of nucleation was monitored with \emph{ex-situ} scanning electron microscopy. The nucleation rate of the graphene islands was observed to drop by an order of magnitude by pre-dosing the Cu(100) surface with a chemisorbed oxygen layer before growth. This reduction in nucleation rate results in the formation of much larger graphene islands. Therefore, the presence of oxygen during graphene growth affects both the relative orientation and average size of grains within the films grown on Cu(100) substrates.
Bandwidth Enhancement of RMPA Using 2 Segment Labyrinth Metamaterial at THz  [PDF]
Parul Dawar, Asok De
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.410071
Abstract:

The past few years have been very eventful with respect to the evolution of the concept and implementation of left-handed materials (LHMs)”. This paper elucidates antenna parameter optimization using 2 Segment Labyrinth metamaterial embedded in antenna substrate at high frequency (THz). Ansoft HFSS has been used to design and analyse the RMPA (rectangular microstrip patch antenna) with design frequency 9.55 THz and operating range of 8.55 THz to 10.55 THz having RT Duroid (εr = 2.33) as substrate material. Magnetic properties of labyrinth resonator have been used to mathematically demonstrate the negative refraction. Nicolson Ross Wier (NRW) method has been used to retrieve the material parameters from transmission and reflection coefficient. Upon incorporation, bandwidth widens to around 4% and VSWR improves by approx 1.5%.

Application of Omori’s Decay Law to the 2001 Bhuj Aftershock Sequence for Kachchh Region of Western India  [PDF]
Parul C. Trivedi
Open Journal of Earthquake Research (OJER) , 2015, DOI: 10.4236/ojer.2015.43009
Abstract: In the present study, the temporal behavior of 2001 Bhuj aftershock sequence in Kachchh region of western peninsular India is studied by the modified Omori law. The Omori law parameters p, c and K are determined with the standard errors by the maximum likelihood estimates using ZMAP algorithm in MatLab environment. The entire aftershock sequence is analyzed by diving it into three separate series with respect to time to weigh up the bigger earthquake of magnitude M 5.7 occurring on March 7, 2006 at Gedi fault. This study helps to understand the cumulative effect of the aftershocks generated by this bigger earthquake of the mainshock sequence. The results of this analysis are discussed with other studies of the different earthquake sequence for the different parts of the world and suggest that all the three series of Bhuj aftershock sequence follow the Omori relation. Values of parameter p vary significantly from series 1 to series 3, i.e., p-value varies significantly with time. Similarly, other two Omori law parameters K and c are also found to change significantly with time. These parameters are useful to describe temporal behavior of aftershocks and to forecast aftershock activity in time domain. Aftershock decay rate provides insight into stress release processes after the mainshock, thus helping to understand the heterogeneity of the fault zone properties and evaluate time-dependent seismic hazard analysis over the region.
Synthesis, characterization and biocidal properties of platinum metal complexes derived from 2,6-diacetylpyridine (bis thiosemicarbazone)  [PDF]
Monika Tyagi, Sulekh Chandra
Open Journal of Inorganic Chemistry (OJIC) , 2012, DOI: 10.4236/ojic.2012.23007
Abstract: The coordination compounds of PdII, PtII, RhIII and IrIII metal ions with a Schiff base ligand (L) i.e. 2,6- diacetylpyridine bis(thiosemicarbazone) have been synthesized and characterized by elemental analyses, molar conductance, magnetic susceptibility measurements, IR, NMR and electronic spectral studies. On the basis of molar conductance and elemental analyses the complexes were found to have composition [M(L)]Cl2 and [M’(L)Cl]Cl2, where M = Pd(II), Pt(II) and M’ = Rh(III), Ir(III). The spectral studies reveal that the complexes possess monomeric composition. Complexes of PdII and PtII were found to have four coordinated square planar geometry whereas the complexes of RhIII and IrIII posses six coordinated octahedral geometry. The ligand field parameters were calculated using various energy level diagrams. In vitro synthesized compounds and metal salts have been tested against some species of plant pathogenic fungi and bacteria in order to assess their antimicrobial properties.
Reliability Analysis of a Powerloom Plant Using Interval Valued Intuitionistic Fuzzy Sets  [PDF]
Sanjay Kumar Tyagi
Applied Mathematics (AM) , 2014, DOI: 10.4236/am.2014.513193
Abstract:

In this paper, we investigate the reliability analysis of a powerloom plant by using interval valued intuitionistic fuzzy sets (IVIFS). Herein, we modeled a powerloom plant as a gracefully degradable system having two units A(n) and B(m) connected in series. The reliability ofncomponents of unitAandmcomponents of unitBis assumed to be an IVIFS defined over the universe of discourse [0, 1]. Thus, the reliability of the system obtained is an IVIFS that covers the inherited uncertainty in data collection and reliability evaluation of a powerloom plant.

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