| 1. |
- Tanveer, M. K., et al.
(author)
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Prevalence and chemo-therapeutical investigations of gastrointestinal nematodes in domestic pigeons in Lahore, Pakistan
- 2011
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In: Tropical Biomedicine. - 0127-5720. ; 28:1, s. 102-110
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Journal article (peer-reviewed)abstract
- The prevalence of gastrointestinal nematodes was studied in 143 (80 male and 63 female) domestic pigeons. Faecal samples were collected to determine the gastrointestinal nematodes of domestic pigeons through qualitative and quantitative faecal examinations. A total of 48 (male 33 and 25 female) naturally infected domestic pigeons were divided into G(1) (albendzdole) and G(2) (fenbendazole) treatment-groups along with one control group (C). The overall prevalence of gastrointestinal nematodes was 40.5% (58/143) in domestic pigeons. Likewise, the prevalence of gastrointestinal nematodes in males and females was found 41.3% (33/58) and 39.7% (25/58) respectively. The overall prevalence of Capillaria obsignata and Ascaridia columbae was found to be 67.2% and 32.8%, respectively. The prevalence of C. obsignata and A. columbae in males was 72.7% (24/33) and 27.8% (9/33) and in females was 60% (15/25) and 40% (10/25), respectively. There was no significant sex related difference seen in the prevalence of C. obsignata (p>0.56) and A. columbae (p>0.40) in domestic pigeons, respectively. The overall efficacy of albendazole and fenbendazole was calculated to be 66% and 71%. A remarkable significant difference (p<0.05) was observed in eggs per gram before and after treatment in both G(1) and G(2) treated-groups. The efficacy of fenbendazole was found to be more significant (p<0.02) than albendazole.
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| 2. |
- Tanveer, Muhammad
(author)
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Design of Time-to-Digital Converter Circuits for 3D Time-of-Flight Measurements
- 2014
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Licentiate thesis (other academic/artistic)abstract
- The three-dimensional view of the world is something that we often take for granted, a phenomenon that has proven challenging for machine vision applications in which description of the environment requires the relative position and motion of different objects in the scene. Currently, range imaging (RIM) measurements are based on digital imaging technology and are merged with the ability to measure the distance to the corresponding object point in each pixel. The distance measurement is based on either the direct or indirect time-of-flight principle. The distance to the corresponding object point in each pixel is directly correlated with time-resolved imaging concerning the measurement of the photon arrival time. This time-resolved image generates a distance image by using the direct time-of-flight technique. This distance image is much more useful than an ordinary picture in regard to measuring and controlling anything, including in the process industry, obstacle detection for automotive safety, navigation, and path planning. The time resolved imaging system consists of two essential building blocks: 1) a photon detector capable of sensing single photons and 2) a fast time resolver or time-to-digital converter that can measure the time of light to picosecond resolution. To address emerging applications, a miniaturized time resolver with acceptable performance and a low cost must be designed that could be integrated with an array of single photon detectors. The goal of this thesis is therefore to investigate, design, and layout a time-to-digital converter to achieve an acceptable cm-level resolution for a range of 10-15 meters. In this thesis, two ideas have been selected for investigation based on their appealing attributes, including their improved resolution, area, and power consumption: 1) an on-pixel time stretcher based on analog time expansion and 2) the combination of the on-pixel time stretcher with a global gated ring oscillator-based time-to-digital converter. Both ideas have been used in conjunction to demonstrate a new architecture for a time-to-digital converter for 3-D time-of-flight measurements. The time stretcher uses analogue time expansion, where the time interval to be measured is stretched by a factor k. This is achieved by charging a capacitor with a constant current I, followed by discharging the capacitor by a current I/k . To achieve an acceptable linearity and constant current generation, wide swing cascode current source/sinks have been used. An idea to build precisely matched current mirror as a time stretcher has also been addressed. The final time-to-digital conversion is performed by the gated ring oscillator-based time-to-digital converter. The multiphase gated ring oscillator, which is the heart of time-to-digital converter, is capable of measuring the stretched time interval by counting the full clock cycles and determining the timing positions within the clock cycle. The work has been discussed in light of the previous research by designing circuits, performing layouts, simulating and conducting parasitic extractions in a 0.35 μm CMOS process. Based on simulations and results, a prototype of an integrated time-to-digital can be built to achieve a cm-level distance error.
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| 3. |
- Vasile, Massimiliano, et al.
(author)
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The Suaineadh Project : a Stepping Stone Towards the Deployment of Large Flexible Structures in Space
- 2010
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In: Proceedings of the 61<sup>st</sup> International Astronautical Congress. - : the International Astronautical Federation. ; , s. IAC-10-C3.4-
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Conference paper (peer-reviewed)abstract
- The Suaineadh project aims at testing the controlled deployment and stabilization of space web. The deployment system is based on a simple yet ingenious control of the centrifugal force that will pull each of the four daughters sections apart. The four daughters are attached onto the four corners of a square web, and will be released from their initial stowed configuration attached to a central hub. Enclosed in the central hub is a specifically designed spinning reaction wheel that controls the rotational speed with a closed loop control fed by measurements from an onboard inertial measurement sensor. Five other such sensors located within the web and central hub provide information on the surface curvature of the web, and progression of the deployment. Suaineadh is currently at an advanced stage of development: all the components are manufactured with the subsystems integrated and are presently awaiting full integration and testing. This paper will present the current status of the Suaineadh project and the results of the most recent set of tests. In particular, the paper will cover the overall mechanical design of the system, the electrical and sensor assemblies, the communication and power systems and the spinning wheel with its control system.
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