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- 저자 : Farid Ullah (검색결과 3 건)
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Three Degree of Freedom Acoustic Energy Harvester Using Improved Helmholtz Resonator
Izhar,Farid Ullah Khan 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.1
This paper presents the development of a broadband, multi-frequency acoustic energy harvester. The devised energy harvester contains an optimized Helmholtz resonator with conical cavity and a piezoelectric composite plate. The shape and dimensions of the resonator are selected based on the 3D pressure acoustics analysis in COMSOL Multiphysics®. In addition, a cantilever beam, made up of a brass base, a copper rod and a steel sheet, is integrated with the harvester’s piezoelectric plate to add an extra degree of freedom to the device. The developed harvester exhibited three peaks at 1501, 1766 and 1890 Hz frequencies, which correspond to the three resonant frequencies of the harvester. Furthermore, the harvester, when subjected to 130 dB sinusoidal SPL and 1501 Hz resonant frequency, generated a maximum power of 214.23 μW. However, when the harvester is operated under random (real) SPL in the vicinity of household electric generated, it produced about 250 and 265 mV output AC and DC voltage levels respectively.
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Female Directors’ Foreign Experience and Environmental and Sustainable Performance
Ping Jiang,Farid Ullah,Collins G. Ntim,Yasir Shahab,Xianling Jiang 한국증권학회 2022 Asia-Pacific Journal of Financial Studies Vol.51 No.2
We examine the impact of female directors’ foreign experience on environmental and sustainable (ES) performance in Chinese listed firms from 2010 to 2016. We find that female directors’ foreign experience, especially work experience, significantly positively impacts firms’ ES performance. The results are robust, and self-selection concerns are addressed using the Heckman two-step model and propensity score matching. Also, female directors’ foreign experience impacts ES performance more significantly when female directors gain foreign experience from a Scandinavian law country or a civil law country. Overall, our results reveal that female directors with foreign experience transmit ES knowledge and practices to Chinese firms.
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Ali Raza Gurmani,Sami Ullah Khan,Amjad Ali,Tehseen Rubab,Timothy Schwinghamer,Ghulam Jilani,Abid Farid,Jinlin Zhang 한국원예학회 2018 Horticulture, Environment, and Biotechnology Vol.59 No.4
Greenhouse studies were undertaken to evaluate the genetic performance of two cucumber genotypes (Long Green and Summer Green) at four salinity levels (0, 25, 50, and 100 mM NaCl). Seeds were pretreated with 50 mg salicylic acid (SA) L−1 and 25 mg kinetin (Kin) L−1. Under hydroponic conditions, seed pretreatment with Kin significantly increased shoot and root dry biomass and reduced the salt injury index in both genotypes. SA reduced the salt injury index of Long Green cucumbers. In a pot experiment, Kin treatment reduced Na+ and increased K+ concentration, photosynthesis, and chlorophyll content in both genotypes, compared to SA under saline soil conditions. Kin treatment improved fruit yield in both genotypes, while SA had a statistically significant effect on Long Green fruit yield. The application of SA and Kin enhanced salinity tolerance in both genotypes by the activation of antioxidants, especially superoxide dismutase, peroxidase, and catalase, which offset oxidative injury. Summer Green exhibited better salt tolerance and improved osmoregulation that resulted in higher fruit yield than Long Green. It was concluded that cucumber genotypes differed in salt tolerance, and seed pre-treatment with Kin minimized salt stress injury, even in sensitive genotype which could sustain crop production under saline conditions.
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