Wind-induced oscillations of circular cylindrical shells

A theoretical analysis for the free vibration of clamped/free and clamped/ ring stiffened cylindrical shells has been developed and programmed for digital computer solution. The analysis is capable of handling vibration characteristics of cylindrical shells, in the swaying (cantilever mode n = l) as well as in the ovalling or breathing modes (n ≥ 2; n is circumferential wave number), with arbitrary length to radius ratio and radius to thickness ratio. In the case of a shell with an end ring it also allows for variation in the non -dimensional ring characteristics (ring breadth/shell radius, ring depth/shell radius). Three translational shell inertia components are included and the effects of ring eccentricity and mass and rotary inertia are examined. The paper examines the accuracy of various engineering approximations as compared with more exact solutions from Flügge's thin shell equations and discusses the error in terms of a non-dimensional frequency parameter. [Continues.

Two-Warehouse Partial Backlogging Inventory Model For Deteriorating Items With Ramp Type Demand

This paper deals with two warehouse system for deteriorating items with ramp type demand. In this inventory model initially demand is considered to be linear function of time and it became constant after a finite time parameter. Holding cost assume to be constant in both warehouse. Partial backlogging is allowed. The proposed model is developing to minimize the total inventory cost which includes holding cost, backlogging cost, lost sale cost, and deterioration cost. Here three cases are taken into consideration depending on time where demand becomes constant. This is only an analytic approach towards the model. Keywords: - Two warehouse inventory, ramp type demand, holding cost, deteriorating item

Hematološke promjene izazvane dimetoatom u štakora

Chronic effects of a sublethal dose (150 mg/kg body weight) of dimethoate, an organophosphorus insecticide, on blood constituents were investigated in rats after exposure of 15 and 30 days. A significant decrease was observed in haemoglobin concentration, total RBC and WBC counts and in haematocrit values. After 30 days of exposure, the levels of blood glucose, cholesterol, urea, total bilirubin and the activities of glutamic-oxalacetic transaminase, glutamic- pyruvic transaminase and amylase markedly increased, but the activities of acid phosphatase and cholinesterase significantly decreased. There was no effect on total plasma protein content. The rats exposed to dimethoate for 30 days showed more prominent changes in all the blood constituents than those exposed for 15 days.Kronični učinci subletalne doze organskofosfornog insekticida dimetoata (150 mg/kg tjelesne težine injiciranog intraperitonealno svakog drugog dana), na sastojke krvi u štakora proučavani su nakon 15 do 30 dana tretmana. Značajan pad zamijećen je u postotku hemoglobina, broju eritrocita, leukocita i vrijednosti hematokrita. Nivo glukoze u krvi, kolesterola, ureje, ukupnog bilirubina i aktivnosti glutamin-oksalacetat transaminaze, glutaminpiruvičke transaminaze i amilaze značajno su porasli nakon 30 dana izloženosti, ali aktivnost kisele fosfataze se značajno smanjila. Učinak nije zamijećen na sadržaju protein plazme. Štakori izlagani dimetoatu 30 dana pokazali su uočljivije promjene u svim sastojcima krvi negoli oni izlagani samo 15 dana

The International criteria for reporting study Quality for Sudden Cardiac Arrest/Death tool: IQ-SCAD

Background Studies reporting on the incidence of sudden cardiac arrest and/or death (SCA/D) in athletes commonly lack methodological and reporting rigour, which has implications for screening and preventative policy in sport. To date, there are no tools designed for assessing study quality in studies investigating the incidence of SCA/D in athletes. Methods and Results The International criteria for reporting study Quality for Sudden Cardiac Arrest/Death tool (IQ-SCA/D) was developed following a Delphi process. Sixteen international experts in sports cardiology were identified and invited. Experts voted on each domain with subsequent moderated discussion for successive rounds until consensus was reached for a final tool. Inter-observer agreement between a novice, intermediate and expert observer was then assessed from the scoring of 22 relevant studies using weighted and unweighted Kappa analyses. The final IQ-SCA/D tool comprises 8 domains with a summated score out of a possible 22. Studies are categorised as low, intermediate and high quality with summated IQ-SCA/D scores of ≤11, 12-16 and ≥17 respectively. Inter-rater agreement was ‘substantial’ between all three observers for summated IQ-SCA/D scores and study categorisation. Conclusions The IQ-SCA/D is an expert consensus tool for assessing the study quality of research reporting the incidence of SCA/D in athletes. This tool may be used to assist researchers, reviewers, journal editors, and readers in contextualising the methodological quality of different studies with varying athlete SCA/D incidence estimates. Importantly, the IQ-SCA/D also provides an expert-informed framework to support and guide appropriate design and reporting practices in future SCA/D incidence trials

Mental health and physical activity: A COVID-19 viewpoint

COVID-19, which has been declared a pandemic by the World Health Organisation, has become a public health emergency across the globe. It is a highly contagious disease, which elicits high levels of fear amongst the world population and is considered a threat to the world economy. As a response to this pandemic, international governments have devised unconventional measures to guard the health of their citizenry. Among these are the “new normal” country lockdown that mandates working from home, home-schooling of children, and physical/social distancing from friends and family. For the majority, this has resulted in momentary job loss and loneliness, and other psychological illnesses. Hence millions are frightened, depressed and panic easily as a result of the tension due to the uncertainty, which interferes with their job performance, livelihoods, international trade and the world economy. If not mitigated, this is likely to cause physical health deterioration, with severe mental illness being the outcome. To reduce mental health illnesses during and after the COVID-19 pandemic, evidence suggests prioritising regular participation in physical activity and exercise across lifespan. It is also important for medical experts who specialise in the care and management of mental health to recognise physical activity and exercise as a medicine that can ameliorate some mental illnesses and their associated risk factors

Magnetic moments of the low-lying {1/2}^- octet baryon resonances

The magnetic moments of the negative parity octet resonances with spin {1/2}: $N^*$(1535), $N^*$(1650), $\Sigma^*$(1620), and $\Xi^*$(1690) have been calculated within the framework of the chiral constituent quark model. In this approach, the presence of the polarized $q\bar{q}$ pairs (or the meson cloud, in other words) is considered by using the Lagrangian for Goldstone boson emission from the constituent quarks. Further, the explicit contributions coming from the spin and orbital angular momentum, including the effects of the configurations mixing between the states with different spins, are obtained. The motivation for these calculations comes from the recent interest in experimental measurement of the magnetic moment of the ${S_{11}(1535)}$ resonance and of similar calculations being done within lattice quantum chromodynamics approaches. Our results can be compared with those expected to come from these sources.Comment: 17 pages, 2 table

Single Spin Asymmetry ANA_N in Polarized Proton-Proton Elastic Scattering at s=200\sqrt{s}=200 GeV

We report a high precision measurement of the transverse single spin asymmetry $A_N$ at the center of mass energy $\sqrt{s}=200$ GeV in elastic proton-proton scattering by the STAR experiment at RHIC. The $A_N$ was measured in the four-momentum transfer squared $t$ range $0.003 \leqslant |t| \leqslant 0.035$ \GeVcSq, the region of a significant interference between the electromagnetic and hadronic scattering amplitudes. The measured values of $A_N$ and its $t$-dependence are consistent with a vanishing hadronic spin-flip amplitude, thus providing strong constraints on the ratio of the single spin-flip to the non-flip amplitudes. Since the hadronic amplitude is dominated by the Pomeron amplitude at this $\sqrt{s}$, we conclude that this measurement addresses the question about the presence of a hadronic spin flip due to the Pomeron exchange in polarized proton-proton elastic scattering.Comment: 12 pages, 6 figure

Evolution of the differential transverse momentum correlation function with centrality in Au+Au collisions at sNN=200\sqrt{s_{NN}} = 200 GeV

We present first measurements of the evolution of the differential transverse momentum correlation function, {\it C}, with collision centrality in Au+Au interactions at $\sqrt{s_{NN}} = 200$ GeV. {\it C} exhibits a strong dependence on collision centrality that is qualitatively similar to that of number correlations previously reported. We use the observed longitudinal broadening of the near-side peak of {\it C} with increasing centrality to estimate the ratio of the shear viscosity to entropy density, $\eta/s$, of the matter formed in central Au+Au interactions. We obtain an upper limit estimate of $\eta/s$ that suggests that the produced medium has a small viscosity per unit entropy.Comment: 7 pages, 4 figures, STAR paper published in Phys. Lett.

Longitudinal double-spin asymmetry and cross section for inclusive neutral pion production at midrapidity in polarized proton collisions at sqrt(s) = 200 GeV

We report a measurement of the longitudinal double-spin asymmetry A_LL and the differential cross section for inclusive Pi0 production at midrapidity in polarized proton collisions at sqrt(s) = 200 GeV. The cross section was measured over a transverse momentum range of 1 < p_T < 17 GeV/c and found to be in good agreement with a next-to-leading order perturbative QCD calculation. The longitudinal double-spin asymmetry was measured in the range of 3.7 < p_T < 11 GeV/c and excludes a maximal positive gluon polarization in the proton. The mean transverse momentum fraction of Pi0's in their parent jets was found to be around 0.7 for electromagnetically triggered events.Comment: 6 pages, 3 figures, submitted to Phys. Rev. D (RC