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1
Content available remote

Angular Asymmetry in the Production of Light and Heavy Recoil Nuclides in Proton Induced Reaction with Au Target at GeV Energies

100%
Sharma S., Kamys B.
Acta Physica Polonica A
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2015
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vol. 127
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issue 5
1533-1535
EN
It is shown that model calculations are able to reproduce main properties in terms of experimental mass dependence of the forward-backward asymmetry of the emitted reaction products from proton-Au collisions in the proton beam energy range from 1 GeV to 3 GeV. Qualitative as well as quantitative comparisons are done between the measurements and the calculations performed by means of the intra nuclear cascade code INCL4.6 coupled with four different codes: SMM, GEMINI++, ABLA07, and GEM2 with the aim to validate the selected reaction models.
2
Content available remote

Structural and Electrical Conductivity Studies of Doped ZnS

100%
Sharma S., Chand P.
Acta Physica Polonica A
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1992
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vol. 81
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issue 6
653-658
EN
The effect of cobalt impurities on transport and structural properties of doped ZnS has been studied through electrical resistivity, X-ray diffraction and scanning electron microscopy. Correlating the results obtained, it has been shown that the Co concentrations considerably influence the transport properties as well as the structural features, in particular the β → α phase transformation of ZnS.
3
Content available remote

Effect of Diffusion on (ZrO_{2})_{0.8}(Y_{2}O_{3})_{0.2} Ceramic

100%
Sharma S., Chand P.
Acta Physica Polonica A
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1995
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vol. 88
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issue 3
503-509
EN
Effect of iodine and lithium diffusion on undoped and doped (with transition metal ions: Ti, V, Ni, Fe, Cu, Co and Mn) samples of polycrystalline (ΖrO_{2})_{0.8}(Y_{2}O_{3})_{0.2} ceramic has been investigated using X-ray diffraction, scanning electron microscopy and electron paramagnetic resonance.
4
Content available remote

Laser Raman and Infrared Absorption Spectra of 2,4-dichloronitrobenzene

81%
Rastogi V., Jain D., Mital H., Sharma S.
Acta Physica Polonica A
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1991
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vol. 79
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issue 6
765-774
EN
The laser Raman and infrared absorption spectra of 2,4-dichloronitrobenzene have been recorded in pure liquid state. The vibrational spectra have been analysed assuming C_{s}, point group for the molecule. The assignments for fundamental vibrations, combination and overtone frequencies and internal modes of vibrations of NO_{2} group have been proposed.
5
Content available remote

Reducing Leakage Power for SRAM Design Using Sleep Transistor

81%
Khandelwal S., Akashe S., Sharma S.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
185-187
EN
Low power design is the industry buzzword these days in present chip design technologies. Caches occupy around 50% of the total chip area and consume considerable amount of power. This project's focus is to reduce leakage power consumption of an 8 kbit SRAM by employing techniques like power gating. The main technique used in power gating is the use of sleep transistor. In our design we have chosen a stack-based implementation.
6
Content available remote

Efficient Implementation of Multistage Digital Interpolators Using Half Band Filters

81%
Ratan R., Sharma S., Kohli A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
199-201
EN
The process of increasing the sampling rate of any signal by a factor is known as interpolation. This paper presents the effective and efficient implementation of multistage implementation of digital interpolator using half band filters. The single stage filters are efficient for lower order interpolation factors but for higher rate change which is required in modern digital communication systems like wideband code division multiple access, worldwide interoperability for microwave access single stage implementation does not gives efficient response. For these applications a multistage implementation of the interpolator is preferred. But multistage implementation increases complexity of the overall system. This complexity can be reduced considerably by using half band filters. All this has been done with the help of the Agilent's advanced design software.
7
Content available remote

Performance Comparison of QPSK Based Single and Double Stage Digital Interpolators

81%
Ratan R., Sharma S., Kohli A.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
196-198
EN
In this paper, the performance of single stage and double stage digital interpolators has been compared and has been showed that by using multi stage interpolation system the reliability of any communication system increases drastically. Digital signal interpolation systems can be implemented in a variety of ways. The basic interpolator for up-sampling can be a combination of an expander unit with an interpolation low-pass filter in cascade. Complicated implementations can be done by connecting multiple expander and low-pass filter pairs in cascade. This paper presents the efficient implementation of digital interpolation systems for up-sampling of single stage and double stage digital interpolators by using quadrature phase shift keying technique. Comparison is done in terms of spectrum of generated signal, envelope power, modulated signal trajectory, input and output constellation and noise performance.
8
Content available remote

Structural and Electron Paramagnetic Resonance Studies of (ZrO)_{0.8}(Y_{2}O_{3})_{0.2}

81%
Shukla N., Sharma S., Chand P., Misra B.
|
EN
The polycrystalline samples of copper and vanadium doped as well as undoped (ZrO)_{0.8}(Y_{2}O_{3})_{0.2} were synthesized and studied using X-ray diffraction, scanning electron microscopy and electron paramagnetic resonance (EPR) techniques in order to investigate their structural and magnetic behaviour. The effect of exposure to lithium vapours on the host lattice of these ceramic materials is also studied using EPR technique. It has been observed from X-ray diffraction study that the samples consist of mainly two phases monoclinic and tetragonal. The monoclinic phase is in dominant proportion. Scanning electron microscope study showed that the morphology of the samples is similar to each other. EPR studies showed interesting changes on diffusion of lithium into the lattice of the host materials.
9
Content available remote

Analysis Procedure of the Positronium Lifetime Spectra for the J-PET Detector

28%
Dulski K., Zgardzińska B., Białas P., Curceanu C., Czerwiński E., Gajos A., Głowacz B., Gorgol M., Hiesmayr B., Jasińska B., Kisielewska-Kamińska D., Korcyl G., Kowalski P., Kozik T., Krawczyk N., Krzemień W., Kubicz E., Mohammed M., Pawlik-Niedźwiecka M., Niedźwiecki S., Pałka M., Raczyński L., Raj J., Rudy Z., Sharma N., Sharma S., Shivani S., Shopa R., Silarski M., Skurzok M., Wieczorek A., Wiślicki W., Zieliński M., Moskal P.
Acta Physica Polonica A
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2017
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vol. 132
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issue 5
1637-1640
EN
Positron annihilation lifetime spectroscopy has shown to be a powerful tool to study the nanostructures of porous materials. Positron emission tomograph is a device allowing imaging of metabolic processes e.g. in human bodies. A newly developed device, the Jagiellonian PET will allow positron annihilation lifetime spectroscopy in addition to imaging, thus combining both analyses providing new methods for physics and medicine. In this contribution we present a computer program that is compatible with the Jagiellonian PET software. We compare its performance with the standard program LT 9.0 by using positron annihilation lifetime spectroscopy data from hexane measurements at different temperatures. Our program is based on an iterative procedure, and our fits prove that it performs as good as LT 9.0.
10
Content available remote

Time Calibration of the J-PET Detector

28%
Skurzok M., Silarski M., Alfs D., Białas P., Shivani, Curceanu C., Czerwiński E., Dulski K., Gajos A., Głowacz B., Gorgol M., Hiesmayr B., Jasińska B., Kisielewska-Kamińska D., Korcyl G., Kowalski P., Kozik T., Krawczyk N., Krzemień W., Kubicz E., Mohammed M., Pawlik-Niedźwiecka M., Niedźwiecki S., Pałka M., Raczyński L., Raj J., Rudy Z., Sharma N., Sharma S., Shopa R., Wieczorek A., Wiślicki W., Zgardzińska B., Zieliński M., Moskal P.
Acta Physica Polonica A
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2017
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vol. 132
|
issue 5
1641-1644
EN
The Jagiellonian positron emission tomograph project carried out in the Institute of Physics of the Jagiellonian University is focused on construction and tests of the first prototype of PET scanner for medical diagnostic which allows for the simultaneous 3D imaging of the whole human body using organic scintillators. The J-PET prototype consists of 192 scintillator strips forming three cylindrical layers which are optimized for the detection of photons from the electron-positron annihilation with high time-and high angular resolutions. In this article we present time calibration and synchronization of the whole J-PET detection system by irradiating each single detection module with a ²²Na source and a small detector providing common reference time for synchronization of all the modules.
11
Content available remote

Preliminary Studies of J-PET Detector Spatial Resolution

28%
Pawlik-Niedźwiecka M., Niedźwiecki S., Alfs D., Białas P., Curceanu C., Czerwiński E., Dulski K., Gajos A., Głowacz B., Gorgol M., Hiesmayr B., Jasińska B., Kisielewska D., Korcyl G., Kowalski P., Kozik T., Krawczyk N., Krzemień W., Kubicz E., Mohammed M., Pałka M., Raczyński L., Raj J., Rudy Z., Shivani, Silarski M., Skurzok M., Sharma N., Sharma S., Shopa R., Strzelecki A., Wieczorek A., Wiślicki W., Zgardzińska B., Zieliński M., Moskal P.
Acta Physica Polonica A
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2017
|
vol. 132
|
issue 5
1645-1648
EN
The J-PET detector, based on long plastic scintillator strips, was recently constructed at the Jagiellonian University. It consists of 192 modules axially arranged into three layers, read out from both sides by digital constant-threshold front-end electronics. This work presents preliminary results of measurements of the spatial resolution of the J-PET tomograph performed with ²²Na source placed at selected position inside the detector chamber.
12
Content available remote

Human Tissue Investigations Using PALS Technique - Free Radicals Influence

28%
Jasińska B., Zgardzińska B., Chołubek G., Pietrow M., Gorgol M., Wiktor K., Wysogląd K., Białas P., Curceanu C., Czerwiński E., Dulski K., Gajos A., Głowacz B., Hiesmayr B., Jodłowska-Jędrych B., Kamińska D., Korcyl G., Kowalski P., Kozik T., Krawczyk N., Krzemień W., Kubicz E., Mohammed M., Pawlik-Niedźwiecka M., Niedźwiecki S., Pałka M., Raczyński L., Rudy Z., Sharma N., Sharma S., Shopa R., Silarski M., Skurzok M., Wieczorek A., Wiktor H., Wiślicki W., Zieliński M., Moskal P.
Acta Physica Polonica A
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2017
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vol. 132
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issue 5
1556-1558
EN
The positron annihilation lifetime spectroscopy was applied to the samples of the human uterine leiomyomas and the normal myometrium tissues taken from the selected place of the uterus during a surgery. The method indicated differences in values of the measured positron annihilation lifetime spectroscopy parameters (lifetimes and intensities) between healthy and diseased tissue samples. The additional measurements were performed either in darkness or in presence of visible light which influenced the free radicals present in both kind of tissues and, as a result, made changes in free annihilation and o-Ps decay lifetime and intensity values.
13
Content available remote

A Method to Produce Linearly Polarized Positrons and Positronium Atoms with the J-PET Detector

28%
Mohammed M., Białas P., Curceanu C., Czerwiński E., Dulski K., Gajos A., Głowacz B., Gorgol M., Hiesmayr B., Jasińska B., Kisielewska D., Korcyl G., Kowalski P., Kozik T., Krawczyk N., Krzemień W., Kubicz E., Pawlik-Niedźwiecka M., Niedźwiecki S., Pałka M., Raczyński L., Raj J., Rudy Z., Sharma N., Sharma S., Shivani, Skurzok M., Silarski M., Wieczorek A., Wiślicki W., Zgardzińska B., Zieliński M., Moskal P.
Acta Physica Polonica A
|
2017
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vol. 132
|
issue 5
1486-1489
EN
A method for creating linearly polarized positrons and ortho-positronium (o-Ps) atoms with the J-PET detector is presented. The unique geometry and properties of the J-PET tomography enable one to design a positron source such that the quantization axis for the estimation of the linear polarization of produced o-Ps can be determined on the event by event basis in a direction of the positron motion. We intend to use ²²Na or other β⁺ decay isotopes as a source of polarized positrons. Due to the parity violation in the beta decay, the emitted positrons are longitudinally polarized. The choice of the quantization axis is based on the known position of the positron emitter and the reconstructed position of the positronium annihilation. We show that the J-PET tomography is equipped with all needed components.
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