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A D-Band Waveguide-SIW Transition for 6G Applications
Altaf Amir,Elahi Manzoor,Abbas Syed Muzahir,Yousaf Jawad,Almajali Eqab 한국전자파학회 2022 Journal of Electromagnetic Engineering and Science Vol.22 No.4
In this work, a design of a transition from a standard D-band waveguide to substrate integrated waveguide (SIW) technology is presented for 6G applications. The waveguide is connected to an SIW by carving a slot at the bottom metal of the printed circuit board (PCB). A pair of vias is added to shift the inband null to a higher frequency, whereas a parasitic patch is used to improve impedance matching. A prototype of a back-to-back SIW transition is fabricated and measured using D-band VNA extenders. The measurement shows a −10 dB impedance bandwidth of 26.5 GHz (135–161.5 GHz) and a 3 dB bandwidth of 28 GHz (133.8–161.8 GHz). The transition can be integrated with a D-band antenna for 6G applications.
The effect of enzymatic hydrolysis of pretreated wastepaper for bioethanol production
Nazia Hossain,Lee Lai Hoong,Pranta Barua,Manzoore Elahi M Soudagar,Mahlia Teuku Meurah Indra 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12
Enzymatic hydrolysis of waste biomass for bioethanol production is considered a decades old traditional, inexpensive, and energy-effective approach. In this study, waste office paper was pretreated with diluted sulfuric acid (H2SO4) and hydrolyzed with one of the most available and cost-effective enzymes, cellulase derived from Trichoderma reesei, under submerged static condition. Three different pretreatment approaches--cut into 2 cm2, blended with distilled water, and pretreated with diluted H2SO4--have been implemented, and pretreatment with diluted H2SO4 was the most effective. Hydrolysis with different concentrations--0.5M, 1.0M, 1.5M, 2.0M of H2SO4--was performed. The maximum glucose content was obtained at 2.0M H2SO4 at 90 min reaction time, and glucose yield was 0.11 g glucose/ g wastepaper. The cut paper, wet-blended, and acid-treated wastepaper was hydrolyzed with cellulase enzyme for 2, 4, and 5 consecutive days with 5mg, 10mg, 15mg, and 20mg enzyme loadings. The maximum glucose content obtained was 9.75 g/l from acid-treated wastepaper, after 5 days of enzymatic hydrolysis with 20mg enzyme loading and a glucose yield of a 0.5 g glucose/g wastepaper. The wastepaper hydrolysate was further fermented for 6, 8, and 10 hours continuously with Saccharomyces cerevisiae (yeast), and at 10 hours of fermentation, the maximum glucose consumption was 0.18 g by yeast. Further, HPLC analysis of the fermented medium presented a strong peak of bioethanol content at 16.12min. The distillation of bioethanol by rotary evaporator presented 0.79ml bioethanol/fermented solution, which indicated the conversion efficiency of 79%.