A method of time-frequency analysis (TFA) based on wavelets is applied to study the phase space structure of three-dimensional asymmetric triaxial galaxy enclosed by spherical dark halo component. The investigation is carried out in the presence and absence of dark halo component. Time-frequency analysis is based on the extraction of instantaneous frequency from the phase of the continuous wavelet transform. This method is comparatively fast and reliable. This method can differentiate periodic from quasi-periodic, chaotic sticky from chaotic non-sticky, ordered from chaotic and also, it can accurately determine the time interval of the resonance trapping and transitions too. Apart from that, the phenomenon of transient chaos can be explained with the help of time-frequency analysis. Comparison with the method of total angular momentum (denoted as Ltot) proposed recently is also presented.
ABSTRACT. The kinetics of oxidation of nicotinic acid by peroxomonosulfate (PMS) has been studied in acetate buffers. Stoichiometry of the reaction corresponds to the reaction of one mole of the oxidant with a mole of nicotinic acid. N→O product has been confirmed both by UV visible and IR spectroscopy. The reaction is second order viz. first order with respect to each reactant. Activation parameters have also been evaluated. A plausible reaction mechanism is mentioned and the derived kinetic rate law accounts for experimental observations.
This is a generalization of the paper by Bhatnagar and Beena Gupta ‘Resonance in the restricted problem of three bodies with short-periodic perturbations’. The motion of an asteroid moving in the gravitational field of Jupiter is considered. In the original paper it was assumed that Jupiter is moving in a circular orbit around the Sun. In the present paper we consider the orbit to be elliptic. The series occurring in the problem are expanded in powers of a small parameter ε, which represents the ratio of the mass of Jupiter to that of the Sun. The perturbations in the osculating elements are obtained up to 0(ε).
BACKGROUND: Spontaneous intra-cerebral haemorrhage (ICH) is a major public health problem with
an annual incidence of 10–30 cases per 100 000 population, accounting for 2 million (10–15%) of
approximately 15 million strokes, which occur worldwide each year. AIMS AND OBJECTIVE: The main objective of this study is
(i) to correlate volume and location of lesion (hemorrhage) with clinical picture and prognosis, (ii) to determine clinical and CT
parameters or ndings that could predict prognosis. METHODS AND MATERIAL: The study was conducted on 100 Patients
with diagnosis of spontaneous ICH and who were diagnosed and admitted to MGM Medical College and LSK Hospital,
Kishanganj, Bihar, India from 01/08/19 to 30/07/2021, age ranged between 18 and 75 years. The inclusion criteria were as
follows: (1) spontaneous ICHs on the basis of C.T scan and (2) No antecedent disease such as arterio venous malformations,
tumour, anticoagulation therapy, cerebral aneurysms, or traumatic events. RESULT: The haemorrhagic stroke on the basis of
site, putamen is 44, frontal and parietal is 5 and temporal is 3 in numbers with weakness of limbs or focal neurological decit
was commonest presentation associated with hypertension and diabetes as risk factors was 50% and 07% respectively. The
lobar and deep haemorrhages constitute 18% and 75% respectively but the mean volume of haemorrhage 28.44cm3 and
36.52cm3. CONCLUSION: In present study the location of ICH was lobar in 18% deep ganglionic (+ventricle) in 75%,
cerebellar in 3% and pontine or midbrain in 4% of the patients. The location of the hematoma in 13 (72.7%) of the LH patients
was conned to a single cerebral lobe, while in 5 (27.2%) of LH patients, hematoma was located in two lobes
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