NUST Institutions Library Catalogue Search for 'kw,wrdl: (su-br:"Noise control.")'

A practitioner's guide to resampling for data analysis, data mining, and modeling /

By Good, Phillip I.. Boca Raton, FL : CRC Press, 2012 . x, 214 p. : 25 cm.. 9781439855508

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Power equipment engine technology /

By Abdo, Edward.. Clifton Park, NY : Delmar/Cengage Learning, 2011 . 1 online resource (xii, 398 pages) : , Includes index. 9781418053888

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Handbook of human factors and ergonomics /

By Salvendy Gavriel. Hoboken, NJ : Wiley, 2012 . xx, 1732 p. : , Includes index. http://www.amazon.com/Handbook-Factors-Ergonomics-Gavriel-Salvendy/dp/0470528389/ref=sr_1_1?s=books&ie=UTF8&qid=1405925902&sr=1-1&keywords=9780470528389 25 cm.. 9780470528389 (hardback)

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Operational amplifiers and linear integrated circuits /

By Coughlin, Robert F.. Upper Saddle River, N.J. : Prentice Hall, 2001 . xxvii, 529 p. : 25 cm.. 0130149918

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Operational amplifiers and linear integrated circuits /

By Coughlin, Robert F.. Englewood Cliffs, N.J. : Prentice-Hall, 1987 . xxiii, 455 p. : 25 cm.. 013637901X

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Operational amplifiers and linear integrated circuits /

By Coughlin, Robert F.. Englewood Cliffs, N.J. : Prentice Hall, 1991 . xxvi, 502 p. : 24 cm.. 0136399231

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Operational amplifiers and linear integrated circuits /

By Coughlin, Robert F.. Upper Saddle River, N.J. : Prentice Hall, 2001 . xxvii, 557p. : 25 cm.. 8177587669

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Hot and cold water supply /

By Garrett, R. H.. Chichester, West Sussex, U.K. ; | Ames, Iowa : Wiley-Blackwell, 2008 . x, 411 p. : , Includes index 25 cm.. 9781405130028 (pbk. : alk. paper) | 1405130024 (pbk. : alk. paper)

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Power-switching converters /

By Ang, Simon S.,. Boca Raton : CRC Press, 2011 . xxxiv, 619 p. : 25 cm.. 9781439815335

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The Pre-Fabrication of Building Facades /

. 95p.: 9783319226941

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Effects of Broadband Noise on Sleep Quality /

By Zulfiqar, Zanib . . 78p. , Quality sleep is related to multiple valued performances in human life, including maintaining health and improving outcomes at work. Disturbance of sleep can increase the morbidity rate and can create multiple psychological and physiological issues. Broadband noises were hypothesized to mask disruptive noises and improve sleep quality. However, the efficacy of noise in improving sleep measures remained unclear due to the smaller sample size, uncontrolled noise environment, and sleep duration. The main aim of the study was to quantify sleep quality, sleep fragmentation, sleep latency, and relevant sleep factors by providing broadband noises and to assess whether white noise could be a non-pharmacological treatment for better sleep quality. For that purpose, sleep monitoring devices i.e., Fitbit Charge 4 and 5 as well as multiple questionnaires including PSQI, rMEQ, AASP, and St Mary questionnaire were used for data collection. Both hardware and questionnaire data were used to evaluate the effect of white noise on all the sleep factors i.e., sleep stages, sleep latency, total sleep duration, and overall sleep score. Also, environmental noise was measured by using decibel meters. Mostly healthy participants having the age of 25.07+/-4.66 for the questionnaire-based study and 24.25+/- 2.57 for hardware-based data were selected for data collection. Multiple statistical tests were performed on the collected data. ANOVA tests were performed on Fitbit’s data along with the post-hoc tests. Also, chi-square tests were conducted on questionnaire data. The p-value>0.0.5 in all tests suggested that no significant effect of white noise on sleep quality. The results concluded that white noise does not play a significant role in improving sleep quality. However, it can be used as a placebo effect for better sleep for specific persons. The results are based on both sleep monitoring devices and questionnaires with proper statistical analysis, having greater sample size and under controlled environmental noise. However, this work can be extended by changing the population of the experiment i.e., infants and ICU patients to check the effects of white noise. 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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Novel Isolation Structures of MIMO Antennas for Mobile Devices /

By Baloch, Babar Aslam. Rawalpindi, MCS (NUST), 2022 . xiii, 105 p

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Investigation and Optimization of Critical Response Variables in Wire Electrical Discharge Machining of SmCo₅ Magnetic Material /

By Mehmood, Adil . . 99p. , The magnetic alloys of samarium-cobalt SmCo₅ have been used in high-performance engineering as a result of their outstanding thermal stability and magnetic strength, but they are hard and brittle, which is a major challenge when trying to machine these using traditional machining methods. Wire Electrical Discharge Machining (WEDM) provides a practical approach to find a solution to shape such hard-to-machine materials, but a full picture of parameters and their response for SmCo₅ has not been established. The present study examines the effect of the essential parameters of the WEDM processes on the critical performance parameters, such as the kerf width, the surface roughness and the material removal rate (MRR), for machining of SmCo₅. An experimental design using Taguchi L18 array was used whereby the impacts of electrical, mechanical, and materialrelated factors were evaluated in a systematic manner and experimental trials were conducted. Analysis of Variance (ANOVA) achieved statistical analysis results that pulse on time is the primary determinant of kerf width via control of discharge energy, and pulse off time is the ultimate determinant of surface roughness safe through control of discharge stability and discharge cooling behavior. It was discovered that material removal was highly influenced by servo voltage because of the erosion behavior of the brittle magnetic alloy was not uniform. Multi-response optimization was conducted with the aid of the Weighted Sum Normalization, the Multi-Response Signal-to-Noise Ratio and the Grey Relational Analysis to handle the multiple machining objectives of conflicting nature. Of these, the Grey Relational Analysis had the best fit to the experimental results hence indicating better ability in the modeling of overall machining performance. 30cm.

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