NUST Institutions Library Catalogue Search for 'kw,wrdl: (su-br:"MS- MECH-18")'

Water resources engineering /

By Wurbs, Ralph Allen.. Upper Saddle River, NJ : Prentice Hall, 2002 . x, 828 p. : 25 cm.. 0130812935

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Historic construction and conservation : materials, systems and damage /

By Roca, Pere,. . 1 online resource 9780429052767 | 9780429628054

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Tensor Algebra and Tensor Analysis for Engineers : With Applications to Continuum Mechanics /

By Itskov, Mikhail.. . 1 online resource (XIX, 300 pages 20 illustrations, 13 illustrations in color.) 9783319988061

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Enhancing Security of Cloud Based IoT Systems Through Network Access Control (NAC) /

By Khan, Awais . . xi, 84 p

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Preparation and Characterization of Pure Pla Filament and Pbat-Reinforced Pla Filament For Fdm 3d Printing /

By Naeem Ul Hassan. . 77p. , This study focuses on preparing pure polylactic acid (PLA) and polybutylene adipate –coterephthalate (PBAT)-reinforced PLA filaments. PLA and PBAT are biodegradable aliphatic polyesters and have recently received considerable attentions. Due to its brittle nature, PLA has limited application in various fields. To overcome this challenge, numerous efforts have been made to incorporate various additives to enhance its performance. In this work, pure PLA filament and PBAT-reinforced PLA filament with diameter 1.75 ± 0.02 mm were prepared in the lab. Their thermal and mechanical properties were analyzed and compared with the commercial PLA filament bought from the market. Following the previous research works and suggestions of incorporating no more than 10 wt.% PBAT, we have mixed 8 wt.% PBAT into the PLA mixture. We then proceeded to extrude pure PLA and PBAT-reinforced PLA filaments at a temperature range of 170 oC to 180 oC, utilizing single screw extruder. Next, we printed tensile and flexural specimens using an FDM 3D printer, in accordance with Taguchi L9 OA. Due to PBAT’s high ductility, 92-8 wt.% PLA-PBAT filament demonstrated a significant increase in elongation at break, reaching up to 12%. Likewise, the PLA-PBAT filament displayed tensile and flexural strengths of up to 48.34 MPa and 107.295 MPa respectively. These values are comparable to the tensile and flexural strengths of pure PLA, which is a great indication that the addition of 8 wt.% PBAT did not cause any unacceptable reduction in the tensile and flexural strengths. Additionally, it was found through DSC analysis that PLA-PBAT filament exhibited a higher degree of crystallinity (Xc) of up to 38.7%, which is significantly higher than that of pure extruded PLA. Furthermore, the TGA curve indicated that thermal stability of PLA-PBAT filament was improved by adding 8 wt.% PBAT. Moreover, digital microscopy results revealed that PLA-PBAT filament had a ductile fracture after necking, whereas pure PLA had a brittle fracture. Lastly, statistical analysis showed that both material type and layer thickness had significant impact on the results. The addition of this new PLA-PBAT filament provides an additional alternative to the current FDM filaments, and it will aid in reducing the constraints of the materials when it comes to additive manufacturing (AM) progress. 30cm.

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Design of control system and fabrication of special compartment in Static Refrigerators /

By Arshad, Muhammad Bilal . . 54p. , Refrigerators being used for domestic purposes are of three types, namely static, brewed, and no-frost. The aim of this project was to introduce a new compartment in static refrigerators to enhance the quality and freshness of food present in this compartment. It was achieved by having control over temperature depending on the needs of the user and needs for the type of food inside the compartment. There can be two methods to fabricate this special compartment. One is by using parallel evaporators and other is by using fan and airduct. The parallel evaporator method is expensive but highly efficient, while air duct is less expensive and does not compromise enough efficiency, in term of energy consumption and cooling. The airduct was implanted in the refrigerator and results were taken. The result shows the total time to reach the target temperature, and time to drop per half degree of temperature. The target was to set the temperature at any value between 5 to -5 oC. In this project, the minimum temperature achieved was -1 oC, as the average temperature of evaporator goes to -12 oC, rather than the - 18 oC for most of the domestic refrigerators. 30cm.

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Therapeutic Potential of Galantamine for Managing the Complications Associated with Ischemic Stroke /

By Ahsan, Mehwish . . 104p. , Ischemic stroke remains the leading cause of illness and second leading cause of death worldwide. Previous research has shown that galantamine has neuroprotective properties, reducing neuronal death and damage in neurodegenerative conditions and improving cognitive function in Alzheimer's disease patients. The investigation looked into the possible mechanisms by which this medication could reduce cell death. Wistar rats were subjected to a temporary 30-minute occlusion of the right middle cerebral artery (MCA) and given an oral dose of 5mg/kg for three weeks. After 18 days of surgery, behavioral assessments were carried out. Galantamine enhanced grip strength, motor function, and muscle strength in rats. Spatial memory and object recognition examinations revealed cognitive improvements, thus indicating enhanced cognitive abilities and memory retention. Moreover, rats subjected to galantamine treatment displayed increased sociability and heightened locomotor activity during social interaction and open-field assessments. Molecular analysis of galantamine treatment in rats showed an upregulation of SOD2 expression, suggesting enhanced antioxidant defense, and a downregulation of TLR4 expression, suggesting a reduction in neuroinflammation, supporting the anti-inflammatory properties of galantamine. The histological analysis done with H&E staining of brain tissue revealed enhanced tissue morphology in the galantamine-treated group, signifying the neuroprotective effects of galantamine. The reduction in neuronal damage, edema, and inflammatory cell infiltration further supported this observation. The results demonstrate that galantamine, potentially through the preservation of a functional cholinergic system, mitigated the impairments caused by stroke in a basic learning and memory test by decreasing cellular death. 30cm.

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Design and Development of Toroidal Propeller for Drone Applications /

By Ali, Aarib Irfan . . 182p. , The demand for low-noise and ecient propulsion systems for unmanned aerial vehicles has driven research into unconventional propeller designs. One such promising conguration is the toroidal propeller, which has gained attention for its potential to reduce noise emissions while maintaining or improving aerodynamic performance. The research follows a methodology that begins with an extensive literature review and operating point selection to dene the design requirements and constraints. A validated computational setup was developed using unsteady RANS-based CFD simulations. Several toroidal propeller concepts were initially generated, out of which a baseline model was selected for further study. The baseline design was optimized using a Design of Experiments response surface methodology and obtain an optimized propeller with maximum thrust and reduced noise. Sensitivity analysis was carried out to assess the inuence of individual parameters on thrust, torque, and noise. The optimized design showed signicant improvements in thrust with considerable reduction in noise as compared to initial concepts. Aeroacoustic analysis was also performed to evaluate the noise characteristics of the toroidal conguration. Using broadband noise models, the toroidal propeller demonstrated promising reductions in tonal noise components, making it suitable for operations in noise-sensitive environments. To validate the computational ndings, experimentation validation was also performed. The optimized toroidal propeller was evaluated using ve dierent materials: ABS, PLA, PETG, CF PETG, and an Engineering Resin via Finite Element Analysis. Suitable manufacturing methods were employed and a custom test bench conguration XXII was built to test the propeller thrust and noise. The propeller was tested under controlled conditions for thrust and noise. The experimental results matched closely with the computational results and veried the validity of toroidal propelelr as viable replacement of traditional propellers for UAVs, oering advantages in both thrust and acoustic performance. The toroidal propeller showed higher value of thrust over complete range of RPM and and delivering upto 35% more thrust than traditional propeller at 15,000RPM. In addition, it also had a lower acoustic signature and was 11% quieter than the traditional propeller. The successful integration of computational design, optimization, and experimental validation demonstrates the practical potential of this novel propeller architecture. Furthermore, the research lays a foundation for future work involving transient LES acoustic modeling, in-ight testing, and applicationspecic customization of toroidal designs. 30cm.

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