22,905 research outputs found
Low Voltage Floating Gate MOS Transistor Based Four-Quadrant Multiplier
This paper presents a four-quadrant multiplier based on square-law characteristic of floating gate MOSFET (FGMOS) in saturation region. The proposed circuit uses square-difference identity and the differential voltage squarer proposed by Gupta et al. to implement the multiplication function. The proposed multiplier employs eight FGMOS transistors and two resistors only. The FGMOS implementation of the multiplier allows low voltage operation, reduced power consumption and minimum transistor count. The second order effects caused due to mobility degradation, component mismatch and temperature variations are discussed. Performance of the proposed circuit is verified at ±0.75 V in TSMC 0.18 ”m CMOS, BSIM3 and Level 49 technology by using Cadence Spectre simulator
Where we stand on structure dependence of ISGMR in the Zr-Mo region: Implications on K_\infty
Isoscalar giant resonances, being the archetypal forms of collective nuclear
behavior, have been studied extensively for decades with the goal of
constraining bulk nuclear properties of the equation of state, as well as for
modeling dynamical behaviors within stellar environments. An important such
mode is the isoscalar electric giant monopole resonance (ISGMR) that can be
understood as a radially symmetric density vibration within the saturated
nuclear volume. The field has a few key open questions, which have been
proposed and remain unresolved. One of the more provocative questions is the
extra high-energy strength in the region, which manifested in
large percentages of the sum rule in Zr and Mo above the
main ISGMR peak. The purpose of this article is to introduce these questions
within the context of experimental investigations into the phenomena in the
zirconium and molybdenum isotopic chains, and to address, via a discussion of
previously published and preliminary results, the implications of recent
experimental efforts on extraction of the nuclear incompressibility from this
data.Comment: 9 pages, 7 figures, invited to be submitted to a special issue of
EPJA honoring Prof. P. F. Bortigno
Congenital granular cell lesion in newborn mandible
Congenital granular cell lesion (CGCL) is a rare non-neoplastic lesion found in newborns also known as Neumannâs tumor. This benign lesion occurs predominantly in females mostly as a single mass. The histogenesis and natural history of the lesion remains obscure. It arises from the mucosa of the gingiva, either from the maxillary or mandibular alveolar ridge. The lesion is more common in the maxillary alveolar ridge than the mandibular.The present report describes a case of congenital granular cell lesion in an eight-day-old female child who was born with a mass on the anterior mandibular alveolar ridge. The mass was protruding from her mouth and compromised feeding. A clinical diagnosis of teratoma was suggested. Histologically, cells of this lesion are identical to granular cell tumor (neuroectodermal type) and show intense diastase-resistant Periodic Acid Schiff positivity. Immunohistochemically, cells are positive for vimentin but negative for S-100 and desmin, thus suggesting that CGCL is possibly derived from primitive gingival mesenchymal cells rather than having schwannian origin.Key words: Congenital epulis, congenital granular cell lesion, immunohistochemistr
Minority odors get equal say
The olfactory system becomes more sensitive when odor inputs are weak, and less sensitive when confronted with strong odors
Queue Length and Server Content Distribution in an Infinite-Buffer Batch-Service Queue with Batch-Size-Dependent Service
We analyze an infinite-buffer batch-size-dependent batch-service queue with Poisson arrival and arbitrarily distributed service time. Using supplementary variable technique, we derive a bivariate probability generating function from which the joint distribution of queue and server content at departure epoch of a batch is extracted and presented in terms of roots of the characteristic equation. We also obtain the joint distribution of queue and server content at arbitrary epoch. Finally, the utility of analytical results is demonstrated by the inclusion of some numerical examples which also includes the investigation of multiple zeros
Intra-night Optical Variability of Luminous Radio Quiet QSOs
In the present paper we report the detection of intra-night variability in
some of the RQQSOs and one LDQ. To study intra-night variability, we carried
out photometric monitoring of seven RQQSOs and one LDQ in Johnson V-passband
using 1.2 meter optical/IR telescope at Gurushikhar, Mount Abu, India.
Observations were made in nine nights during the first half of the year 2000;
seven RQQSOs: 0748+291, 0945+438, 1017+280, 1029+329, 1101+319, 1225+317,
1252+020 and one LDQ: 1103-006 were observed. RQQSOs 0748+291, 1225+317 and LDQ
1103-006 have shown existence of intra-night variations. In the case of
1017+280 (RQQSO) there is indication of intra-night variation in one night
where as the observations in another night do not show convincingly the
existence of intra-night variability. RQQSOs 0945+438, 1029+329, 1101+319 and
1252+020 have not shown any intra-night variations. We compiled intra-night
variability data for radio-loud and radio-quiet AGNs from the literature for
statistical analysis. It is found that a good fraction of radio-quiet AGNs show
intra-night variations with the maximum amplitude of variation being about 10%.
On the other hand blazars show at times intra-night flux variability up to
100%. In case of radio-loud AGNs (excluding blazars), maximum amplitude of
intra-night variation lies between the variability amplitude of radio-quiet
AGNs and blazars i.e. the flux variation is close to 50%. The results indicate
that the energy generation mechanism and the environment around the central
engine in different classes of AGNs may be similar, if not identical. The
standard model for radio-loud AGNs, where shocks are propagating down
relativistic jet or models based on disturbances in accretion disks can also
explain the micro-variability in RQQSOs.Comment: 12 pages, 12 figures, Accepted for publication in A & A, uses aa.cl
Determination of Average Aggregation Number of Solochrome Mordant Dyes by Spectrophotometric Method
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