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Search Results: 1 - 10 of 191844 matches for " Mehul D. Solanki "
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Assessment of Available Transfer Capability for Congestion Management in Restructured Electrical Power Network for Competent Operation  [PDF]
U. L. Makwana, S. K. Joshi, Mehul D. Solanki
Journal of Power and Energy Engineering (JPEE) , 2014, DOI: 10.4236/jpee.2014.24053
Abstract: Congestion is the prime cause of problems, due to open access of power system. The AC Power Transmission Congestion Distribution factor (PTCDF) is suitable for computing change in any line quantity for a change in MW bilateral transaction. The proposed PTCDF method is more accurate as compared to the DC power distribution factor. With PTCDF ATC can be calculated. After calculating ATC it is possible to know the valid multiple transaction on power system. With the help of ATC calculations congestion problem can be solved in restructured electrical power network. The paper presents the method for calculating ATC using PTCDF.
Review of Ni-Cu Based Front Side Metallization for c-Si Solar Cells
Mehul C. Raval,Chetan S. Solanki
Journal of Solar Energy , 2013, DOI: 10.1155/2013/183812
Abstract: Given the high percentage of metal cost in cell processing and concerns due to increasing Ag prices, alternative metallization schemes are being considered. Ni-Cu based front side metallization offers potential advantages of finer grid lines, lower series resistance, and reduced costs. A brief overview of various front side patterning techniques is presented. Subsequently, working principle of various plating techniques is discussed. For electroless plated Ni seed layer, fill factor values nearing 80% and efficiencies close to 17.5% have been demonstrated, while for Light Induced Plating deposited layers, an efficiency of 19.2% has been reported. Various methods for qualifying adhesion and long term stability of metal stack are discussed. Adhesion strengths in the range of 1–2.7?N/mm have been obtained for Ni-Cu contacts tabbed with conventional soldering process. Given the significance of metallization properties, different methods for characterization are outlined. The problem of background plating for Ni-Cu based metallization along with the various methods for characterization is summarized. An economic evaluation of front side metallization indicates process cost saving of more than 50% with Ni-Cu-Sn based layers. Recent successful commercialization and demonstration of Ni-Cu based metallization on industrial scale indicate a potential major role of Ni-Cu based contacts in near future. 1. Introduction The present solar PV market is growing at a rate of 35–40% per year and is one of the important renewable energy sources for non-CO2 energy in the future [1]. The rapid decline in the cost per watt has promoted increased deployment, hence nearing the tipping point of grid parity. Given the improving efficiencies of leading technologies, the focus should be to reduce the cost of various system components from wafer to balance of system components [1]. The cell processing typically contributes around 16-17% of the total system cost [2], while the contribution of metallization to the cell processing is around 40% due to the expensive Ag paste [3]. As shown in , the mass of Ag required in the front grid is inversely proportional to the acceptable fractional resistive losses due to front side metallization, irrespective of the finger design [4]. Equation is obtained from , where is substituted in terms of from [4]. Hence the amount of Ag required will double for decrease in acceptable resistive losses by 50%. In addition, due to presence of voids and additional constituents in screen-printed Ag contacts, typical product value is around 1.875, which further
Socio Demographic Profile and Clinical Presentation of Collagen Vascular Disease with Pulmonary Symptoms: A Descriptive Cross Sectional Study
Parul Vadgama,Mehul Bhavsar,Kusum V Shah,Rajesh Solanki
National Journal of Medical Research , 2013,
Abstract: Introduction: Collagen Vascular Disease presented with varied systemic symptoms including pulmonary symptoms, commonly breathless on exertion; dry cough; cough with expectoration; chest pain; and hemoptysis. The current study was conducted to know socio demographic profile and clinical presentation of patient coming with Collagen Vascular Disease having pulmonary symptoms. Methodology: This was a descriptive cross sectional study conducted among Collagen Vascular Disease patient coming with pulmonary symptoms in outpatient department. Results: Among the 50 patients 40% patients were having SC followed by SLE (30%). Most common age group was 31 to 40 year of age followed by 21 to 30 year of age. Both these group contribute more than half of the cases. Eighty percent patients were female with female to male ratio was 4:1. The most common chest symptom in the patients was breathlessness (50%) and fatigue (50%), followed by cough (46%) and chest pain (18%). The most common sign was Crackles (32%) followed by clubbing in 22% of patients. Conclusion: Female and young - middle age more commonly presented with Collagen Vascular Disease. Most of the patients when presented were having wide-ranging pulmonary symptoms-signs indicating extensive involvement of lung tissues which emphasis need for early diagnosis and treatment. [Natl J of Med Res 2013; 3(1.000): 27-29]
Study of Risk Factors of Perinatal Death in Pregnancy Induced Hypertension (PIH)
Mehul T Parmar, Harsha M Solanki, Vibha V Gosalia
National Journal of Community Medicine , 2012,
Abstract: Background: Hypertensive disorders are common complication occurring during pregnancy responsible for maternal & fetal mortality & morbidity. Though the condition is on decline, still stands a public health problem. Objectives: To determine risk factors of perinatal death in women with pregnancy induced hypertension. Materials & Method: A cross-sectional study was conducted over period of one year in the department of Obstetrics & Gynecology in NHL municipal college, Ahmadabad. A total of 100 pregnant women with PIH were enrolled in the study. A pre-tested structured Performa was prepared & women were interviewed to collect necessary information such as detailed history, clinical examination findings & investigations performed. Results were analyzed using MS Excel & Epi Info. Results: In the present study, 29%, 21% & 50 % were of mild PIH, moderate PIH & severe PIH respectively. The incidence of PIH was found more among teenage pregnancy, among primigravidas, those from low socio-economic status, those with history of PIH in previous pregnancy, having family history of PIH & those who were found obese. Emergency delivery, having diastolic blood pressure > 90 mm Hg, higher degree of proteinuria & low birth weight among PIH cases had an adverse perinatal outcome in terms of higher perinatal death. The findings were statistically significant On Univariate analysis; diastolic blood pressure & degree of proteinuria were found to be significant risk factors responsible for perinatal mortality among PIH women. Conclusion: Pregnancy induced hypertension is a common medical disorder associated with pregnancy. In the present study, PIH cases who delivered in emergency, with raised diastolic blood pressure & more proteinuria & neonate with low birth weight were found risk factors for perinatal death. Fetal morbidity & mortality can be reduced by early recognition & institutional management.
Evaluation of operational efficiency of the national anti-malaria program in "High-Risk" rural areas of Vadodara district
Solanki D,Misra Shobha
Indian Journal of Community Medicine , 2007,
Abstract: Background: Malaria was and is a major scourge in India contributing more than three-fourths of the total cases in the Southeast Asian (SEA) region. Malaria is largely infl uenced by the local environmental conditions but can be kept in check if the operational implementation of the National Antimalaria Program: (NAMP) is effective. Keeping in mind the context of the situation in Gujarat, there was an urgent need to carry out a study to assess the operational aspects of the ongoing malaria control program. Objectives: To assess the operational aspects of NAMP in "highrisk" areas of rural Vadodara, seeking bottlenecks and possible correlation to the malaria situation in those areas. Materials and Methods: From 269 "high-risk" villages, 20 villages were selected randomly from 10 Talukas. 40 slide (smear-)-negative, 19 slide (smear-)-positive, 10 laboratory technicians, 10 MultiPurpose Workers (MPW) Supervisors and 18 MultiPurpose (MPW) and 18 Voluntary Workers were interviewed. The performance of the malaria clinic and the NAMP staff was evaluated using a point system. Results and Conclusions: The monthly blood examination rate (MBER) targets could not be achieved in 8 out of 10 primary health centers (PHCs) by active surveillance workers (AS) workers. The mean time interval between blood smear collection (BSC) and its receipt in the laboratory was 7.1 days. 46% of smear-negative patients having received presumptive treatment (PT) and 22% of smear-positive patients receiving radical treatment (RT) were supervised. Administration of "adequate" presumptive treatment and radical treatment to the above two sets of individuals was 65% and 58% respectively. Overall, the performance of 50% of malaria clinics and 94% of villages was poor to average. The study has found enough evidence to conclude that there were lapses in the operation of the NAMP.
Quiet Sun magnetic fields observed by Hinode: Support for a local dynamo
D. Buehler,A. Lagg,S. K. Solanki
Physics , 2013, DOI: 10.1051/0004-6361/201321152
Abstract: The Hinode mission has revealed copious amounts of horizontal flux covering the quiet Sun. Local dynamo action has been proposed to explain the presence of this flux. We sought to test whether the quiet Sun flux detected by Hinode is due to a local or the global dynamo by studying long-term variations in the polarisation signals detectable at the disc centre of the quiet Sun between November 2006 and May 2012, with particular emphasis on weak signals in the internetwork. The investigation focusses on line-integrated circular polarisation V_tot and linear polarisation LP_tot profiles obtained from the Fe I 6302.5 \AA absorption line in Hinode SOT/SP. Both circular and linear polarisation signals show no overall variation in the fraction of selected pixels from 2006 until 2012. There is also no variation in the magnetic flux in this interval of time. The probability density functions (PDF) of the line-of-sight magnetic flux can be fitted with a power law from 1.17 x 10^17 Mx to 8.53 x 10^18 Mx with index \alpha=-1.82 \pm 0.02 in 2007. The variation of \alpha 's across all years does not exceed a significance of 1\sigma. Linearly polarised features are also fitted with a power law, with index \alpha=-2.60 \pm 0.06 in 2007. Indices derived from linear polarisation PDFs of other years also show no significant variation. Our results show that the ubiquitous horizontal polarisation on the edges of bright granules seen by Hinode are invariant during the minimum of cycle 23. This supports the notion that the weak circular and linear polarisation is primarily caused by an independent local dynamo.
A preliminary cytogenetic and hematological study of photocopying machine operators
Gadhia P,Patel D,Solanki K,Tamakuwala D
Indian Journal of Occupational and Environmental Medicine , 2005,
Abstract: The incidences of chromosomal aberrations(CAs) as well as sister chromatid exchange frequencies (SCEs) was evaluated from 12 photocopying machine operators working on an average 8-9 hours per day for more than five years. A complete blood picture of each individual was assessed with an automatic particle cell counter. Additionally, blood pressure was measured at the time of blood collection from all photocopying machine operators. For comparison, the control group included another 12 individuals matched according to age, sex, socioeconomic conditions as well as other personal habits. The observations of the present study are indicators of health hazard for, although small, there was a significant increase in the percentage of aberrant cells (P<0.05), total aberrations (P<0.01) as well as total aberrations excluding chromatid gaps (P<0.01) among photocopying machine operators when compared to controls. However, results on SCE analysis of photocopying operators revealed no significant difference from the controls. At the same time all photocopying operators exhibited normal hematological parameters as well as blood pressure values.
CHALLENGES IN THE FORMULATION OF BILAYERED TABLETS - A REVIEW
Patel Mehul
International Journal of Pharmaceutical Research and Development , 2010,
Abstract: Several pharmaceutical companies are currently developing bi-layer tablets, for a variety of reasons: patent extension, therapeutic, marketing to name a few. To reduce capital investment, quite often existing but modified tablet presses are used to develop and produce such tablets. This article explains why the development and production of quality bi-layer tablets needs to be carried out on purpose-built tablet presses to overcome common bi-layer problems, such as layer-separation, insufficient hardness, inaccurate individual layer weight control, cross-contamination between the layers, reduced yield, etc. Using a modified tablet press may therefore not be your best approach in producing a quality bi-layer tablet under GMP-conditions. Especially when high production output is required.
Between Sense and Sensibility: Declarative narrativisation of mental models as a basis and benchmark for visuo-spatial cognition and computation focussed collaborative cognitive systems
Mehul Bhatt
Computer Science , 2013,
Abstract: What lies between `\emph{sensing}' and `\emph{sensibility}'? In other words, what kind of cognitive processes mediate sensing capability, and the formation of sensible impressions ---e.g., abstractions, analogies, hypotheses and theory formation, beliefs and their revision, argument formation--- in domain-specific problem solving, or in regular activities of everyday living, working and simply going around in the environment? How can knowledge and reasoning about such capabilities, as exhibited by humans in particular problem contexts, be used as a model and benchmark for the development of collaborative cognitive (interaction) systems concerned with human assistance, assurance, and empowerment? We pose these questions in the context of a range of assistive technologies concerned with \emph{visuo-spatial perception and cognition} tasks encompassing aspects such as commonsense, creativity, and the application of specialist domain knowledge and problem-solving thought processes. Assistive technologies being considered include: (a) human activity interpretation; (b) high-level cognitive rovotics; (c) people-centred creative design in domains such as architecture & digital media creation, and (d) qualitative analyses geographic information systems. Computational narratives not only provide a rich cognitive basis, but they also serve as a benchmark of functional performance in our development of computational cognitive assistance systems. We posit that computational narrativisation pertaining to space, actions, and change provides a useful model of \emph{visual} and \emph{spatio-temporal thinking} within a wide-range of problem-solving tasks and application areas where collaborative cognitive systems could serve an assistive and empowering function.
Posterior Fossa Arachnoid Cyst Masking a Delayed Diagnosis of Hyperparathyroidism in a Child
B. Dhamija,D. Kombogiorgas,I. Hussain,G. A. Solanki
Case Reports in Endocrinology , 2012, DOI: 10.1155/2012/931371
Abstract: Background. Primary hyperparathyroidism in childhood is a very rare entity, often being diagnosed late after the onset of its presenting symptoms. It most commonly affects patients in their fourth decade of life and beyond. The inclusion of primary hyperparathyroidism in the differential diagnosis is necessary when evaluating patients presenting with nonspecific symptoms such as polyuria, fatigue, weight loss, abdominal pain, nausea, and vomiting. Methods. We report the case of an eleven-year-old girl presenting with three years history of headaches, visual disturbance, along with episodes of emotional lability. Neuroimaging confirmed a large posterior fossa arachnoid cyst. It was decided to manage this lesion conservatively with surveillance. Only after further hospital admissions with recurrent loss of consciousness, dizziness, and nausea to add to her already existing symptoms, a full biochemical and endocrine assessment was performed to look for more specific causes for her presentation. These pointed to a diagnosis of primary hyperparathyroidism. Conclusions. The inclusion of primary hyperparathyroidism in the differential diagnosis should be considered when evaluating paediatric patients presenting with nonspecific (neurological, gastrointestinal, and renal) symptoms in order to establish a prompt diagnosis of the disorder and to avoid severe complications of prolonged hypercalcaemia and end-organ damage.
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