Manifestation of malnutrition among Sunni Muslim Girls of Delhi (6-12 years)

Background: Obesity and undernutrition are the opposite extremes on the scale of adiposity, both of which are the manifestation of malnutrition .Childhood obesity are a global epidemic involving both developed and developing countries. It is a state of over-nutrition with long term complications such as dyslipidemia, hypertension, and coronary artery disease and type-2 diabetes. Underweight is the result of under nutrition and conceptualized in term of thinness which is also an important problem among children of developing countries like India, leading to reduction in growth and development of every body organ especially the Central Nervous System. Long term under-nutrition causes failure in linear growth (height) of the child. Objective: To assess the nutritional status among Sunni Muslim girls based on recently developed body mass index (BMI) cutoff points for children and adolescents. Methods The study subjects were selected form educational institutes of Delhi, India. A total of 370 girls aged 6-12 years were measured and included in the present study. Height and weight were measured and BMI was computed using standard formula. New age and sex specific international cutoff points were utilized to assess nutritional status. Result: In general the mean BMI increased with increasing age. The overall prevalence of thinness, normal weight and overweight were 38.37%, 50% and 11.62% respectively. Present study finds the nutritional stress among girls as evident from the thinness/underweight prevalent among them

Predictor of Metabolic Syndrome: A community study from Urban Delhi, India

The aim of the present study is to assess and compare the presence of metabolic syndrome using IDF and Modified NCEP ATPIII criteria among Sunni Muslim of Delhi and to determine the optimal cut off values of different parameters for the detection of metabolic syndrome. A total of, 406 individuals (125 men, 281women) aged 35-65 years were recruited. Anthropometric, blood pressure and laboratory investigations were performed following the standard protocols. Receiver operating characteristics (ROC) curves of waist circumference, serum triglycerides, High density lipoprotein cholesterol, systolic and diastolic blood pressure and fasting blood glucose were created for the determination of the metabolic syndrome and the area under curve (AUC) was evaluated to determine the predictive efficiency of each variable of metabolic syndrome. The cut off values of each parameter with corresponding sensitivity, specificity, Youden index and likelihood ratios were estimated.  The overall metabolic syndrome assessed through Modified NCEP ATP III was 75.12% while through IDF criterion it was 75.36%. Majority of the participants were equally identified by both definitions. The metabolic syndrome was higher in women as compare to men using both the criteria. The area under curve (AUC) shows that serum triglycerides have highest predictive ability for metabolic syndrome in modified NCEP ATP III and IDF. The population specific cut off values of different variable to detect metabolic syndrome was formed. Although these result may not apply to rest of Indian population due to multi ethnicity but similar studies with large sample size to find the cut off values of parameter for metabolic syndrome is needed for better detection and prevention. 

Semiclassical Instability of the Cauchy Horizon in Self-Similar Collapse

Generic spherically symmetric self-similar collapse results in strong naked-singularity formation. In this paper we are concerned with particle creation during a naked-singularity formation in spherically symmetric self-similar collapse without specifying the collapsing matter. In the generic case, the power of particle emission is found to be proportional to the inverse square of the remaining time to the Cauchy horizon (CH). The constant of proportion can be arbitrarily large in the limit to marginally naked singularity. Therefore, the unbounded power is especially striking in the case that an event horizon is very close to the CH because the emitted energy can be arbitrarily large in spite of a cutoff expected from quantum gravity. Above results suggest the instability of the CH in spherically symmetric self-similar spacetime from quantum field theory and seem to support the existence of a semiclassical cosmic censor. The divergence of redshifts and blueshifts of emitted particles is found to cause the divergence of power to positive or negative infinity, depending on the coupling manner of scalar fields to gravity. On the other hand, it is found that there is a special class of self-similar spacetimes in which the semiclassical instability of the CH is not efficient. The analyses in this paper are based on the geometric optics approximation, which is justified in two dimensions but needs justification in four dimensions.Comment: 14 pages, 4 figures, minor errors corrected and some sentences added in the introduction, accepted for publication in Physical Review

Canonical theory of spherically symmetric spacetimes with cross-streaming null dusts

The Hamiltonian dynamics of two-component spherically symmetric null dust is studied with regard to the quantum theory of gravitational collapse. The components--the ingoing and outgoing dusts--are assumed to interact only through gravitation. Different kinds of singularities, naked or "clothed", that can form during collapse processes are described. The general canonical formulation of the one-component null-dust dynamics by Bicak and Kuchar is restricted to the spherically symmetric case and used to construct an action for the two components. The transformation from a metric variable to the quasilocal mass is shown to simplify the mathematics. The action is reduced by a choice of gauge and the corresponding true Hamiltonian is written down. Asymptotic coordinates and energy densities of dust shells are shown to form a complete set of Dirac observables. The action of the asymptotic time translation on the observables is defined but it has been calculated explicitly only in the case of one-component dust (Vaidya metric).Comment: 15 pages, 3 figures, submitted to Phys. Rev.

Higher dimensional radiation collapse and cosmic censorship

We study the occurrence of naked singularities in the spherically symmetric collapse of radiation shells in a higher dimensional spacetime. The necessary conditions for the formation of a naked singularity or a black hole are obtained. The naked singularities are found to be strong in the Tipler's sense and thus violating cosmic censorship conjecture.Comment: 4 pages, ReVTeX, Phys Rev D Vol 62 107502 (2000

Naked Singularity Formation In f(R) Gravity

We study the gravitational collapse of a star with barotropic equation of state $p=w\rho$ in the context of $f({\mathcal R})$ theories of gravity. Utilizing the metric formalism, we rewrite the field equations as those of Brans-Dicke theory with vanishing coupling parameter. By choosing the functionality of Ricci scalar as $f({\mathcal R})=\alpha{\mathcal R}^{m}$, we show that for an appropriate initial value of the energy density, if $\alpha$ and $m$ satisfy certain conditions, the resulting singularity would be naked, violating the cosmic censorship conjecture. These conditions are the ratio of the mass function to the area radius of the collapsing ball, negativity of the effective pressure, and the time behavior of the Kretschmann scalar. Also, as long as parameter $\alpha$ obeys certain conditions, the satisfaction of the weak energy condition is guaranteed by the collapsing configuration.Comment: 15 pages, 4 figures, to appear in GR

Space-time inhomogeneity, anisotropy and gravitational collapse

We investigate the evolution of non-adiabatic collapse of a shear-free spherically symmetric stellar configuration with anisotropic stresses accompanied with radial heat flux. The collapse begins from a curvature singularity with infinite mass and size on an inhomogeneous space-time background. The collapse is found to proceed without formation of an even horizon to singularity when the collapsing configuration radiates all its mass energy. The impact of inhomogeneity on various parameters of the collapsing stellar configuration is examined in some specific space-time backgrounds.Comment: To appear in Gen. Relativ. Gra

3D evolution of a filament disappearance event observed by STEREO

A filament disappearance event was observed on 22 May 2008 during our recent campaign JOP 178. The filament, situated in the southern hemisphere, showed sinistral chirality consistent with the hemispheric rule. The event was well observed by several observatories in particular by THEMIS. One day before the disappearance, H$\alpha$ observations showed up and down flows in adjacent locations along the filament, which suggest plasma motions along twisted flux rope. THEMIS and GONG observations show shearing photospheric motions leading to magnetic flux canceling around barbs. STEREO A, B spacecraft with separation angle 52.4 degrees, showed quite different views of this untwisting flux rope in He II 304 \AA\ images. Here, we reconstruct the 3D geometry of the filament during its eruption phase using STEREO EUV He II 304 \AA\ images and find that the filament was highly inclined to the solar normal. The He II 304 \AA\ movies show individual threads, which oscillate and rise to an altitude of about 120 Mm with apparent velocities of about 100 km s$^{-1}$, during the rapid evolution phase. Finally, as the flux rope expands into the corona, the filament disappears by becoming optically thin to undetectable levels. No CME was detected by STEREO, only a faint CME was recorded by LASCO at the beginning of the disappearance phase at 02:00 UT, which could be due to partial filament eruption. Further, STEREO Fe XII 195 \AA\ images showed bright loops beneath the filament prior to the disappearance phase, suggesting magnetic reconnection below the flux rope