Some Inhomogeneous Magnetized Viscous Fluid Cosmological Models with Varying Λ\Lambda

Some cylindrically symmetric inhomogeneous viscous fluid cosmological models with electro-magnetic field are obtained. To get a solution a supplementary condition between metric potentials is used. The viscosity coefficient of bulk viscous fluid is assumed to be a power function of mass density. Without assumin g any {\it ad hoc} law, we obtain a cosmological constant as a decreasing function of time. The behaviour of the electro-magnetic field tensor together with some p hysical aspects of the model are also discussed.Comment: 17 pages, 1 figur

Parameterizaion – Simulation – Optimization Approach for Reservoir Operation

Source: ICHE Conference Archive - https://mdi-de.baw.de/icheArchiv

Finding Connected Dense kk-Subgraphs

Given a connected graph $G$ on $n$ vertices and a positive integer $k\le n$, a subgraph of $G$ on $k$ vertices is called a $k$-subgraph in $G$. We design combinatorial approximation algorithms for finding a connected $k$-subgraph in $G$ such that its density is at least a factor $\Omega(\max\{n^{-2/5},k^2/n^2\})$ of the density of the densest $k$-subgraph in $G$ (which is not necessarily connected). These particularly provide the first non-trivial approximations for the densest connected $k$-subgraph problem on general graphs

Numerical Analysis of Friction Stir Welding on an Alumunium Butt Joint

In this paper, we present a three-dimensional numerical analysis of friction stir welding on an alumunium butt joint. A thin sheet of aluminum marking material was embedded into the 6061-aluminum alloy panel and its rear weld path. The positions after friction stir welding were investigated by metallographic techniques. Looking at the visualized material flow pattern, a three-dimensional model was developed to numerically simulate the temperature profile and plastic effects. The calculated velocity profile for plastic flow in the immediate vicinity of the tool generally agrees with the visualized results. Increasing the tool speed while maintaining a constant tool feed rate increases the material flow near the pin. The shape and size of the predicted weld zone match the experimentally measured ones

Magnesium Status in Hospitalized ICCU and non ICCU Patients With Special Reference to Waterborne Magnesium

Introduction: Low serum magnesium levels in hospitalized patients including those with cardiovascular ailments have been reported by many studies. On the other hand, magnesium therapy is advocated but has not yet been conclusively proved. In our earlier study, an association between waterborne magnesium and hypomagnesaemia in healthy subjects was reported. The present study was aimed at the contribution of waterborne magnesium among filtered and non-filtered water users in hospitalized patients. Material and methods: The present study was carried out at SMIMER, Surat. Ethical committee approval was taken. On informed consent, subjects from ICCU and general ward of Medicine unit were selected. Demographic and clinical information was collected. Serum magnesium, cardiac profile and renal profile were analyzed. Patients with conditions such as kidney, liver, brain and other critical illness were excluded. The results were expressed as Mean and SD and appropriate statistical tools were applied to arrive at conclusions.  Results: Among total 557 subjects including 185 healthy subjects, 93 ICCU and 279 non-ICCU patients, the incidence of hypomagnesaemia (serum Mg < 1.7 mg/dl) was 18%, 36% and 42% was observed respectively. A significant difference (p < 0.01) in serum magnesium between filtered and non-filtered water users in healthy (1.77 ±0.36 vs 2.01 ±0.48), ICCU  (1.35 ±0.44 vs 1.72±0.55), and in non-ICCU patients (1.51 ±0.59 vs 1.77±0.51) was found. No significant difference was observed in other parameters. Conclusion: Significant hypomagnesaemia was observed among users of filtered water as compared to nonfiltered water users in all groups (ICCU, non-ICCU and healthy), strongly suggestive of contribution of waterborne magnesium in maintaining normal status in the population and inadequate levels may be correlated to a higher incidence of myocardial infarction as evident from the present study wherein a 42% prevalence of hypomagnesaemia in ICCU patients was found.&nbsp

Magnesium Status in Hospitalized ICCU and non ICCU Patients With Special Reference to Waterborne Magnesium

Introduction: Low serum magnesium levels in hospitalized patients including those with cardiovascular ailments have been reported by many studies. On the other hand, magnesium therapy is advocated but has not yet been conclusively proved. In our earlier study, an association between waterborne magnesium and hypomagnesaemia in healthy subjects was reported. The present study was aimed at the contribution of waterborne magnesium among filtered and non-filtered water users in hospitalized patients. Material and methods: The present study was carried out at SMIMER, Surat. Ethical committee approval was taken. On informed consent, subjects from ICCU and general ward of Medicine unit were selected. Demographic and clinical information was collected. Serum magnesium, cardiac profile and renal profile were analyzed. Patients with conditions such as kidney, liver, brain and other critical illness were excluded. The results were expressed as Mean and SD and appropriate statistical tools were applied to arrive at conclusions.  Results: Among total 557 subjects including 185 healthy subjects, 93 ICCU and 279 non-ICCU patients, the incidence of hypomagnesaemia (serum Mg < 1.7 mg/dl) was 18%, 36% and 42% was observed respectively. A significant difference (p < 0.01) in serum magnesium between filtered and non-filtered water users in healthy (1.77 ±0.36 vs 2.01 ±0.48), ICCU  (1.35 ±0.44 vs 1.72±0.55), and in non-ICCU patients (1.51 ±0.59 vs 1.77±0.51) was found. No significant difference was observed in other parameters. Conclusion: Significant hypomagnesaemia was observed among users of filtered water as compared to nonfiltered water users in all groups (ICCU, non-ICCU and healthy), strongly suggestive of contribution of waterborne magnesium in maintaining normal status in the population and inadequate levels may be correlated to a higher incidence of myocardial infarction as evident from the present study wherein a 42% prevalence of hypomagnesaemia in ICCU patients was found.&nbsp