Analytical approximation of a distorted reflector surface defined by a discrete set of points

Reflector antennas on Earth orbiting spacecrafts generally cannot be described analytically. The reflector surface is subjected to a large temperature fluctuation and gradients, and is thus warped from its true geometrical shape. Aside from distortion by thermal stresses, reflector surfaces are often purposely shaped to minimize phase aberrations and scanning losses. To analyze distorted reflector antennas defined by discrete surface points, a numerical technique must be applied to compute an interpolatory surface passing through a grid of discrete points. In this paper, the distorted reflector surface points are approximated by two analytical components: an undistorted surface component and a surface error component. The undistorted surface component is a best fit paraboloid polynomial for the given set of points and the surface error component is a Fourier series expansion of the deviation of the actual surface points, from the best fit paraboloid. By applying the numerical technique to approximate the surface normals of the distorted reflector surface, the induced surface current can be obtained using physical optics technique. These surface currents are integrated to find the far field radiation pattern

Electronic Properties of Disordered System

In this thesis we have calculated the density of state for an ordered and disordered model system using the Green’s function technique and the recursion method. We have considered a model of binary disordered system. The recursion parameters are calculated by transforming the Hamiltonian into a tridiagonal Hamiltonian. The infinite continued fraction size is truncated after 8th step

Noise and Cluster Size Studies of ALPIDE-CMOS Pixel Sensor for pCT

The use of proton beam has been introduced in medical physics for therapeutic purposes in cancer treatment and it has been proven much more efficient than conventional X-ray. Treatment planning in proton therapy is usually provided with information from X-ray CT where X-ray attenuation in tissue is needed to be converted to proton stopping power. This conversion leads to several uncertainties because proton interacts with matter in a different way than the photon. An intuitive way to mitigate this problem is using charged particles as the basis for the CT-scan and this is the time when the idea of “Proton CT” came up. There are nearly 10 pCT prototypes worldwide and all are designed with two separate devices for proton tracking and calorimetry. Few recent studies discovered the potential of merging these two separate systems into one uniquely featured Digital Tracking Calorimeter (DTC). The DTC is made of multiple layers of Monolithic Active Pixel Sensor (MAPS) chips. In this study, ALPIDE chip has been brought in as MAPS for DTC. The ALPIDE was developed for the heavy-ion experiment at CERN to detect high energy charged particles. For pCT, ALPIDE is conceptually an ideal sensor because of its low power consumption and chip area with more than half a million pixels with in-pixel readout scheme. This thesis is carried out in three main parts: • Characterization of ALPIDE chip focusing particularly on chip’s threshold and fake hit rate. • Measuring radiation-induced effects on the sensor performance. • Analysing sensor response for different types of radiation. In addition, I contributed to Proton Beam Test at OCL, Oslo and analyzed the data afterward. This thesis also includes the analysis performed on proton beam data and significant findings from the analysis. This study represents a key contribution to pCT in terms of defining the sensor behavior and interpreting sensor response.Master's Thesis in PhysicsMAMN-PHYSPHYS39

The Role of apoptosis in suicide gene therapy of glioblastoma

Master's Thesis in Biomedical SciencesBMED395MAMD-MEDB

Some studies on the multi-mesh architecture.

In this thesis, we have reported our investigations on interconnection network architectures based on the idea of a recently proposed multi-processor architecture, Multi-Mesh network. This includes the development of a new interconnection architecture, study of its topological properties and a proposal for implementing Multi-Mesh using optical technology. We have presented a new network topology, called the 3D Multi-Mesh (3D MM) that is an extension of the Multi-Mesh architecture [DDS99]. This network consists of n3 three-dimensional meshes (termed as 3D blocks), each having n3 processors, interconnected in a suitable manner so that the resulting topology is 6-regular with n6 processors and a diameter of only 3n. We have shown that the connectivity of this network is 6. We have explored an algorithm for point-to-point communication on the 3D MM. It is expected that this architecture will enable more efficient algorithm mapping compared to existing architectures. We have also proposed some implementation of the multi-mesh avoiding the electronic bottleneck due to long copper wires for communication between some processors. Our implementation considers a number of realistic scenarios based on hybrid (optical and electronic) communication. One unique feature of this investigation is our use of WDM wavelength routing and the protection scheme. We are not aware of any implementation of interconnection networks using these techniques.Dept. of Computer Science. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2004 .A32. Source: Masters Abstracts International, Volume: 43-03, page: 0868. Adviser: Subir Bandyopadhyay. Thesis (M.Sc.)--University of Windsor (Canada), 2004

Balochistan Movement: Why India's Policy Took a Shift Towards Balochistan Under Narendra Modi Government

On the occasion of Independence Day speech on 15 August 2016, Indian Prime Minister Narendra Modi raised the issue of Baluchistan. From the Red Fort, he made reference to the freedom struggle of Balochistan, Gilgit and Baltistan and gross violation of human rights in these provinces of Pakistan. Indirectly, he pointed finger on Pakistan for the atrocities and chaos it created since partition through state policy against its own people in the Province of Balochistan and in Pak Occupied Kashmir (POK). First time in the history of India, Modi exposed the internal troubles of Pakistan and it ongoing resistant movement in the above mentioned provinces. Naturally this move generated anger in Pakistan while seen as positive development by Baloch resistant leaders. Modi’s Baloch strategy can be seen as a shift in India’s Pakistan policy. India is eager to play Balochistan as a card or pressure point against Pakistan which may be game changer in regional politics. It can also isolate Pakistan in international community for its role in violation of human rights and spreading terrorism. Pakistan has been notorious to play the blame game against India on the issue of Kashmir besides continuously supporting terrorism against India. The well prepared strategy on Balochistan under Modi administration can be seen as giving Pakistan a taste of its own medicines by countering Pakistan’s Kashmir policy. This article is an attempt to understand the Baloch conflict in the light of Modi’s policy shift towards Balochistan and further its impact on Balochistan freedom struggle. Keywords: Baluchistan, Freedom struggle, Regional politics and International community

DEVELOPMENT AND VALIDATION OF REVERSED-PHASE HIGH-PERFORMANCE LIQUID CHROMATOGRAPHY METHOD FOR GABAPENTIN AND ITS RELATED SUBSTANCES IN CAPSULE DOSAGE FORM AND EXCIPIENT COMPATIBILITY STUDIES

Objective: A simple, accurate, precise, and reversed-phase high-performance liquid chromatography (RP-HPLC) method was developed and validated for gabapentin (GBP) and its related substances in the capsule dosage form and excipient compatibility studies. Methods: The review of literature indicates that various methods have been reported for the estimation of GBP. When some excipients were used for GBP, it produced degradation product called lactam due to the presence of more water content. Hence, a novel RP-HPLC method has been developed for studying excipient compatibility and related substances of GBP in capsule dosage form using excipients such as lactose anhydrous and dried maize starch which is having less water activity. Waters Alliance e2695 separation module with ultraviolet/photodiode array (UV/PDA) detector with Inertsil C8 (250 mm×4.6 mm); 5 μm with an injection volume of 50 μl is injected and eluted with the (gradient program) mobile Phase A buffer: acetonitrile (940:60) and mobile phase B buffer: acetonitrile (700:300) pH 6.9 with 5 N potassium hydroxide which is pumped at a speed of 1.5 ml/min and detected by UV/PDA detector at 210 nm. The peaks of GBP and GBP-related compound A are well separated at 6.7 min and 34.5 min, respectively. Results: The method developed was approved for various parameters such as accuracy, specificity, precision, intermediate precision, range, linearity, robustness, limit of detection, limit of quantification, steadiness, and system suitability according to the International Conference on Harmonization guidelines. The results got were according to the acceptance criteria. Conclusion: The technique proposed was assured for detection of related substances in the marketed formulation and could be used for the routine analysis of GBP and GBP-related compound A in the capsule dosage form

Electrical and electronic waste management: a case study in University of Duhok, Iraq

The aim of this paper is to investigate the perception, knowledge and attitude of the households towards electrical and electronic equipment waste (e-waste) management in Duhok city, Iraq. It also tried to identify current e-waste management practiced by households in Duhok. It has been found in this study that much of the electrical and electronic equipment was updated within two thirds of their designed lifetime. Most of the respondents informed that they just threw their e-waste to the waste bin. It can be concluded that all stakeholders of e-waste management, from the government and nongovernmental sectors should consider shifting the management options towards the top of the waste management hierarchy (prevention and waste minimization) by substituting the hazardous materials in e-waste and encouraging redesign of equipment for a better control of the negative impacts of e-waste