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Search Results: 1 - 10 of 741 matches for " Dhingra Vishal "
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Polarization studies in a computer based laboratory
Amit Garg,Reena Sharma,Vishal Dhingra
Latin-American Journal of Physics Education , 2011,
Abstract: This didactic activity is based on computer based learning through sensors and advanced tools for data acquisition and analysis. The fundamental studies related to polarization namely Malus’ Law and study of elliptical and circular polarization have been automated using rotary motion and light sensor. This computer based laboratory allows a student to online collect, analyze and display the data during experimentation leading to better understanding of otherwise a very difficult concept of polarization. Also, time required for carrying out the study of elliptical and circular polarization is substantially reduced from 3 hours to less than half an hour.
Computer assisted magnetism studies
Amit Garg, Reena Sharma,Vishal Dhingra
Latin-American Journal of Physics Education , 2010,
Abstract: The basic objective of this pedagogical activity on magnetism studies is to expose students to a computer assisted learning environment by using various sensors and advanced tools for data acquisition and analysis. Three important studies namely magnetic field variation in different types of disk magnets, solenoid and electromagnetic induction have been done using magnetic field, motion and voltage sensors. This automation of experiments allows a student to continuously acquire and analyse the data online during experimentation leading to better conceptual understanding.
Cytodiagnosis of cutaneous metastasis from renal cell carcinoma: A case report with review of literature
Dhingra Vishal,Misra Vatsala,Singh Anthony,Agarwal Stuti
Journal of Cytology , 2011,
Abstract: Cytodiagnosis of cutaneous metastasis of renal cell carcinoma (RCC) in the absence of history of primary tumor is difficult as it can be confused with other clear cell tumors. We report here a case of cytodiagnosis of cutaneous metastasis of RCC in a patient who had nephrectomy done 9 years back at some other centre, but did not have any records with him. Clinicians should be aware of the possibility of primary internal organ malignancy in patients presenting with cutaneous lesions and therefore conduct a careful examination and get necessary investigations. Prompt diagnosis and treatment will have its bearing on the eventual outcome.
Myoepithelioma breast: clinically masquerading as breast carcinoma
Brijesh Thakur,Vatsala Misra,Vishal Dhingra,Smita Chauhan
Rare Tumors , 2012, DOI: 10.4081/rt.2012.e50
Abstract: Pure myoepithelioma of breast is an extremely rare tumor. Only a few cases have been reported in the literature so far. A 30-year old female presented with a large fungating mass arising from the areolar region of her right breast of six months duration. A clinical diagnosis of breast carcinoma was made and a mastectomy was performed. The specimen measured 23x22x9 cm with attached skin, and showed a large white ulcerated growth with areas of necrosis and hemorrhage. No normal breast tissue, nipple or areolar region was seen. Histopathological examination showed oval to spindle cells arranged in fascicles and bundles with whorling pattern in places showing mild pleomorphism with oval to spindle-shaped vesicular nuclei, prominent eosinophilic nucleoli, eosinophilic cytoplasm and clear cell changes in places, along with perivascular hyalinization and collagenization. Differential diagnosis of pleomorphic hyalinizing angiectatic tumor, solitary fibrous tumor, perivascular epithelioid cell tumor, mammary type myofibroblastic tumor and myoepitheliomawereallconsidered.Immunohistochemistry for vimentin, smooth muscle actin, calponin, caldesmon, p63, epithelial membrane antigen, S-100, CD-31, CD-34, muscle specific antigen, myogenin, desmin, and pancytokeratin was carried out. On the basis of positive staining for vimentin, actin, p63 (nuclear), calponin and caldesmon (focal), a final diagnosis of myoepithelioma was considered; however, cytokeratin negativity was an unusual finding. This case was considered worthy of documentation because of its rarity, and because it highlights the importance of proper clinical examination and radiological examination to prevent misdiagnosis.
Pleomorphic Lobular Carcinoma in a Male Breast: A Rare Occurrence
Bhatia Rohini,P. A. Singh,Misra Vatsala,Dhingra Vishal,Singhal Mitali,Sharma Nishant
Pathology Research International , 2010, DOI: 10.4061/2010/871369
Abstract: Carcinoma of male breast is uncommon as it accounts for 0.7% of total breast cancer. The pathology of male breast cancer is remarkably similar to that of cancers seen in women. The same histological subtypes of invasive cancer are present, although papillary carcinomas (both invasive and in situ) are more common and lobular carcinomas are less common. The predominant histological type, in males, as in females, reported in large series has been infiltrating ductal carcinoma with scattered reports of infiltrating lobular carcinoma, all of them of classical type except for a single case of pleomorphic infiltrating lobular carcinoma. Herein, we describe a case of pleomorphic lobular carcinoma occurring in male breast. 1. Introduction Carcinoma arising in the male breast is a rare occurrence. The overall incidence in men is only 1% of that in women, which translates to a lifetime risk of 0.11% (as compared with about 13% in women). Risk factors are similar to those in women and include first-degree relatives with breast cancer, decreased testicular function (e.g., Klinefelter syndrome), exposure to exogenous estrogens, increasing age, infertility, obesity, prior benign breast disease, exposure to ionizing radiation, and residency in Western countries. Gynecomastia does not seem to be a risk factor. From 4% to 14% of cases in males are attributed to germline BRCA2 mutations. Male breast cancer accounts for 0.7% of total breast cancer [1]. Over the past 25 years, the incidence of male breast cancer has risen by 26%, from 0.86 to 1.08 per 100,000 population [2]. Approximately 85% of primary male breast carcinoma is invasive ductal carcinoma of the “no special type” subtype [3]. Carcinomas of the male breast grossly and microscopically are remarkably similar to those seen in females [4]. The predominant histological type, in males, reported in large series has been infiltrating ductal carcinoma with scattered reports of infiltrating lobular carcinoma [5], all of them were classical type except for single case of pleomorphic infiltrating lobular carcinoma [6]. 2. Case Report 2.1. Clinical Details A 55-year-old male presented with left breast mass of approximately five-month duration. There was no history of trauma, gynaecomastia, oestrogen administration, or drug use. Physical examination revealed a subareolar mass measuring 4 × 4?cm in size. Swelling was firm to hard and nontender. Overlying skin was free. There was no palpable axillary lymph node. Lumpectomy of the breast mass was done. 2.2. Pathological Findings On macroscopic examination, the specimen
The Effects of Interferential Stimulation on Pain and Motion after Shoulder Surgery: A Prospective Randomized Study  [PDF]
Vishal Mehta
Surgical Science (SS) , 2015, DOI: 10.4236/ss.2015.610067
Abstract: Purpose: The purpose of this study is to determine the effects of interferential stimulation on pain and motion after shoulder surgery. Study Design: Randomized Controlled Trial. Methods: 102 patients undergoing arthroscopic rotator cuff repair or labral repair were prospectively randomized to receive either an interferential stimulation unit immediately after surgery (STIM) or not to receive the unit (NO-STIM). Each patient was measured for the range of motion (ROM) in forward flexion (FF), abduction (ABD), internal rotation (IR) and external rotation (ER). These measurements were taken prior to surgery and at the 6 weeks post-operative time point. Visual Analogue Scale (VAS) scores (0 - 10) and the amount of narcotic taken (standardized to 10 mg equivalents of hydrocodone) were measured and compared between the two groups at 2 days and 4 weeks post-operatively. 51 patients were excluded due to failure to document VAS scores and medication usage, lack of follow-up at the 6 weeks post-operative time point or hospitalization after surgery. This left 27 patients in the STIM group and 24 patients in the NO-STIM group. Results: No difference was found in the amount of narcotic taken after 2 days (STIM 14.37 ± 1.02, NO-STIM 15.88 ± 1.22, p = 0.34) or after 4 weeks (STIM 45.32 ± 4.36, NO-STIM 48.96 ± 5.50, p = 0.60). No difference in mean VAS scores were found at 2 days (STIM 5.56 ± 0.53, NO-STIM 4.63 ± 0.57, p = 0.24) or 4 weeks (STIM 1.68 ± 0.39, NO-STIM 1.38 ± 0.34, p = 0.57). At 6 weeks post-operatively, a difference was found in ER (STIM 62.5 ± 4.09, NO-STIM 50.4 ± 4.09, p = 0.04), and no differences found in FF (STIM 134.2 ± 5.29, NO-STIM 133.3 ± 4.85, p = 0.60), ABD (STIM 124.8 ± 6.22, NO-STIM 119.6 ± 5.42, p = 0.53) or IR (STIM 60.0 ± 3.69, NO-STIM 55.9 ± 3.03, p = 0.39). A post-hoc power analysis performed using an á = 0.05 revealed the study to be 90% powered to identify a difference of one narcotic equivalent between groups and 90% powered to identify a 0.3 difference in VAS scores. Conclusions: The use of an interferential stimulator in the immediate post-operative period had no effect on pain or narcotic usage following arthroscopic rotator cuff repair or labral repair. External rotation was significantly greater in the interferential stimulator group while no differences were found in other motion parameters.
Measuring IT Effectiveness in Banks of India for Sustainable Development
Sanjay Dhingra
BVICAM's International Journal of Information Technology , 2011,
Abstract: Banks in India have invested heavily on deployment of information technology (IT) in the past one decade. IT over the years has become business driver rather than a business enabler. Sustainable development of banks depends heavily on effective use of IT. This calls for measuring the effectiveness of IT in these banks. This paper identifies the economic methods of measuring IT effectiveness on the basis of review of literature on the subject.
Performance of b-tagging algorithms at the CMS experiment with pp collision data at $\sqrt s$=8 TeV
Nitish Dhingra
Physics , 2014,
Abstract: The identification of jets originating from b quarks is crucial both for the searches for new physics and for the measurement of standard model processes. The Compact Muon Solenoid (CMS) collaboration at the Large Hadron Collider (LHC) has developed a variety of algorithms to select b-quark jets based on variables such as the impact parameter of charged particle tracks, properties of reconstructed secondary vertices from heavy hadron decays, and the presence or absence of a lepton in the jet, or combinations thereof. Performance measurements of these b-jet identification algorithms are presented, using multijet and $t\overline{t}$ events recorded in proton-proton collision data at $\sqrt s$=8 TeV with the CMS detector during the LHC Run 1.
Evaluation of Morphological Effect on Thermal and Mechanical Performance of PS/PMMA/CdS Nanocomposite Systems  [PDF]
Vishal Mathur, Kananbala Sharma
Advances in Nanoparticles (ANP) , 2013, DOI: 10.4236/anp.2013.23029
Abstract:

In the present paper an effort has been made to investigate effect of dispersion of CdS nanoparticles on the thermal and mechanical properties of PS/PMMA blends. Samples have been prepared through dispersion of CdS nanoparticles (prepared separately) during solution casting blend fabrication processing. These nanocomposites samples are structurally characterized through Wide angle X-ray Scattering (WAXS) and Small Angle X-ray Scattering (SAXS) techniques. Scanning Electron Microscopy (SEM) analyses of these samples have been carried out in lieu of surface morphological characterization. The measurements of glass transition temperature and stress-strain analyses have been performed through Dynamic Mechanical Analyzer (DMA). The thermal conductivity of nanocomposite samples has been determined using Hot Disk Thermal Constants Analyzer. The study shows that the incorporation of dispersed CdS nanoparticles in PS/PMMA blend matrix significantly alter their glass transition behaviour, thermal conductivity and tensile properties.

Unemployment as a Risk Factor for Mental Illness: Combining Social and Psychiatric Literature  [PDF]
Shuo Zhang, Vishal Bhavsar
Advances in Applied Sociology (AASoci) , 2013, DOI: 10.4236/aasoci.2013.32017
Abstract:

Unemployment has been shown to have wide ranging effects on physical and mental health. This review looks to clarify the relationship between unemployment and mental illness specifically, in terms of establishing causality, effect size and moderating factors. The current rational for research combines an etiological approach and interest in the social causation of disease with past work from a social psychological perspective. For this review, PsychInfo, Medline and Embase databases were searched between the years of 1970 and 2011, for prospective studies that include unemployment and mental illness terms. 10 studies were found which matched the inclusion criteria. Studies were included if they studied the long term unemployed, defined the age and gender of their study population, defined their outcome measurements in medical terms, and followed a population prospectively over time. Overall unemployment did precede mental illness; however the exact effect size is unclear. A quantitative meta-analysis was not conducted due to the variability in study design. The discussion tries to point to methodological and theoretical limitations that affect investigations into unemployment and mental illness. It concludes that the work has so far been skewed by individual biases, and that there needs to be wider collaboration between the social sciences and psychiatry.

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