Embedding Approach of Audio Data in RGB Images Using Circle Equation

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Numerické simulace ustáleného stavu rotorové soustavy se dvěma trhlinami uložené v radiálních aktivních magnetických ložiskách

The steady-state response of a two-crack rotor system is investigated by computational simulations in the paper. The rotor system supported by radial active magnetic bearings is excited by centrifugal forces of discs unbalances. A flexibility matrix of Bernoulli beam element takes into account coupling phenomena between directions of vibration. The phenomenon occurs in cracked rotors. The couplings express relations between vibration in different directions, i.e. bending-torsion, bending-longitudinal, and torsion-longitudinal. The flexibility matrix elements of the cracked rotor are derived using the concepts of fracture mechanics for transverse surface crack. Partial opening/closing of cracks implemented in motion equations is determined by sign of stress intensity factor for mode I. The factor is computed for the crack edge. The motion equations are nonlinear because the system response depends on breathing of cracks and nonlinear force coupling is introduced by radial active magnetic bearings. Parametric studies of the system response were carried out in order to examine influence of various angles between two cracks. Several recommendations for detection of cracks and monitoring of the cracked rotor are suggested.V této práci jsou užity výpočetní simulace ke zkoumání ustálené složky odezvy na buzení odstředivými silami nevyvážených disků rotorové soustavy se dvěma trhlinami, jenž je uložená v radiálních aktivních magnetických ložiskách. Matice poddajnosti Bernoulliho nosníkového prvku je upravena tak, aby se uvážily všechny vazby v kmitání, které existují v rotoru s trhlinou, tj. ohybově-torzní, ohybově-podélné a torzně-podélné. Prvky matice poddajnosti s trhlinou jsou odvozeny na základě teorie lomové mechaniky pro příčnou povrchovou trhlinu. Částečné otevření/zavření trhlin zahrnuté do pohybové rovnice je řízeno podle znaménka součinitele intenzity napětí I. módu zatížení vypočítaného na hraně trhliny. Pohybové rovnice rotorové soustavy jsou nelineární kvůli odezvě závislé na dýchání trhlin a nelineární silové vazbě zavedené radiálními aktivními magnetickými ložisky. Byla provedena parametrická studie s cílem zkoumat vliv různých hodnot úhlu mezi trhlinami na ustálený stav odezvy rotorové soustavy. Taktéž jsou prezentovány doporučení pro detekci a monitorování rotoru se dvěma trhlinami

Effect of Explosive Shapes (in Sand Buried Condition) on the Failure of a Circular Clamped Plate of Protective Vehicle

Protective vehicles like armoured personnel carriers (APCs) require assessment of failure of structural elements subjected to impulsive load resulting from explosive blast under sand buried conditions. The explosive shape and location of detonation affect the failure in near field region. In the present study, a circular clamped Rolled Homogenous Armour (RHA) steel plate has been modelled using JC strength & damage model and explosive using JWL equation. Initially, the reflected pressure and specific impulse for a fixed quantity of explosive (3.75 kg) of various shapes i.e. sphere, hemisphere, cylinders with Length to Diameter (L/D) ratio varying from 0.1 to 1 were studied for sand buried at a standoff distance of 118.1 mm. Further, studies were extended for cylindrical charges of φ 213.77 mm with conical 120°-150° and hemispherical cavities with radius of R1.2-R1.8. It was observed that, reflected pressure and specific impulse is much higher for hemispherical cavity of R1.2. The permanent deformation obtained using non-dimensional impulse is valid for explosives without cavities. However, the cavity charges produce failure of plate in the central region of the charge. The critical impulse emerges as an important parameter for assessing failure due to cavity charges. In addition, the scale down experiment is conducted to validate the effectiveness of cavity charges. It can be concluded that cavity charge with hemispherical radius of R1.2 can provide highest damage to RHA plates in close standoff distance

Effective fermion-Higgs interactions at an e(+)e(-) collider with polarized beams

We consider the possibility of new physics giving rise to effective interactions of the form e(+) e(-) Hf (f) over bar, where f represents a charged lepton l or a (light) quark q, and H the recently discovered Higgs boson. Such vertices would give contributions beyond the standard model to the Higgs production processes e+ e-. H l(+) l(-) and e(+) e(-) -> Hq (q) over bar qat a future e(+) e(-) collider. We write the most general form for these vertices allowed by Lorentz symmetry. Assuming that such interactions contribute in addition to the standard model production processes, where the final-state fermion pair comes from the decay of the Z boson, we obtain the differential cross section for the processes e(+) e(-) -> H l(+) l(-) and e(+) e(-) -> Hq (q) over bar to linear order in the effective interactions. We propose several observables with differing CP and T properties which, if measured, can be used to constrain the couplings occurring in interaction vertices. We derive possible limits on these couplings that may be obtained at a collider with centre-of-mass energy of 500 GeV and an integrated luminosity of 500 fb(-1). We also carry out the analysis assuming that both the electron and positron beams can be longitudinally polarized, and find that the sensitivity to the couplings can be improved by a factor of 2-4 by a specific choice of the signs of the polarizations of both the electron and positron beams for the same integrated luminosity. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.Peer reviewe

Influence of LD slag on iron ore sinter properties and productivity

Large amounts of slags from steel plants are produced through basic oxygen furnace and LD furnace. The main purpose of LD process is to convert the molten pig iron and steel scraps into high quality steel. In India, the generation of steel melting slag is over 4 to 4.5 Mt per annum. The amount of steel slags from different steel industries are 150–200 kg/t of steel produced. Disposal of large quantities of slag becomes a big environmental concern. JSW Steel Limited is a 7.0 Mtpa integrated steel plant and produces 3200 tons of total steel making slag per day and in that LD slag is 2000 to 2500 t/day. This LD slag consists of 45.75% CaO, 22.0 % Fe and 8.22% MgO. Thus, recycling of LD slag through the sintering process recovers lime, iron and magnesia and thereby saving of flux material and iron ore. Due to high content of CaO one can replace LD slag by limestone in sintering process. Detail investigation was carried out through lab scale studies for estimating the maximum permissible limits of usage of LD slag in sinter making and to know the influence of LD slag addition on sinter productivity and properties. Experiments were conducted using the LD slag in sinter making from 0 to 60kg/t of sinter. FeO content of the sinter decreased, sinter productivity increased with increase in LD slag addition. Decrease in FeO content is due to decrease in sinter bed temperature and increase in productivity is due to decrease in LOI content of the sinter mix and absence of weight loss due to calcination process. The sinter strength and RDI of the sinter deteriorated due to non availability of free CaO in LD slag and this reduces the formation of calcium ferrites phase and more Fe2O3 remains as free phase due to less reaction with CaO. From the test results it was found that 30 to 35 kg LD slag can be used per ton of sinter to get desired properties of the sinter

Isolated saccular aneurysm of the external jugular vein

Venous aneurysm of the head and neck is a rare clinical entity due to its asymptomatic nature and tendency of clinicians to report only surgical results. Whereas the primary aneurysm of internal jugular vein (IJV) in children is being increasingly recognized, secondary aneurysms of veins of the head and neck in adults, notably the external jugular vein (EJV) aneurysm remains only in anecdotal case reports. We present the case of a 63-year-old previously healthy woman who presented with a gradually progressive right lateral neck swelling over the last 18 months. Following the evaluation, she was diagnosed as a case of isolated spontaneous right-sided EJV aneurysm and was managed by surgical excision of the aneurysm

A comparative assessment of hand grip exercise and 6-minute walk test in chronic obstructive pulmonary disease patients

Background: Chronic obstructive pulmonary disease (COPD) is a leading disease often under-discussed and underdiagnosed causing persistent and chronic obstruction of upper airways. Patients not only suffer respiratory dysfunctions but also, peripheral muscle dysfunction and atrophy leading to muscle fatigue, reduced muscle strength, and endurance impacting exercise capacity, physical activity levels, and decreased ability to perform daily tasks. The Global Initiative for Chronic Obstructive Lung Disease (GOLD) guidelines highlight the need to enhance functional status through assessments like Hand Grip Strength and a 6-minute walk test. The study aimed at a comparative assessment of these exercises in COPD patients along with spirometry for diagnosis, and grading and to find out their combined advantages in COPD management. Methods: This cross-sectional study was conducted on 110 patients at the Department of Physiology, King George’s Medical University, Lucknow, using a questionnaire, and both tests were performed on COPD patients to determine the effectiveness depending on the severity and spirometry results. Results: The recruited patients were classified as per GOLD stages in 4 categories, as disease severity increased, functional and exercise capacity was reduced. There was a negative correlation between GOLD stages and 6-minute walk strength, maximum grip strength, and mean endurance time of COPD patients with r-values of -5.672, -6.874, and -5.879 respectively. Conclusion: COPD patients suffer from functional dysfunctions and exercise limitations, early diagnosis is crucial to limit the severity, and functional tests can play a significant role in determining the health outcomes and improving the quality of life