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RISS 인기검색어
- 검색키워드
- 저자 : Zewei Wang (검색결과 5 건)
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Yiqun Wang,Yongpan Liu,Cong Wang,Zewei Li,Xiao Sheng,Hyung Gyu Lee,Naehyuck Chang,Huazhong Yang IEEE 2016 IEEE transactions on computer-aided design of inte Vol.35 No.2
<P>Energy harvesting from natural environment gives range of benefits for the Internet of things. Scavenging energy from photovoltaic (PV) cells is one of the most practical solutions in terms of power density among existing energy harvesting sources. PV power systems mandate the maximum power point tracking (MPPT) to scavenge the maximum possible solar energy. In general, a switching-mode power converter, an MPPT charger, controls the charging current to the energy storage element (a battery or equivalent), and the energy storage element provides power to the load device. The mismatch between the maximum power point (MPP) current and the load current is managed by the energy storage element. However, such architecture causes significant energy loss (typically over 20%) and a significant weight/volume and a high cost due to the cascaded power converters and the energy storage element. This paper pioneers a converter-less PV power system with the MPPT that directly supplies power to the load without the power converters or the energy storage element. The proposed system uses a nonvolatile microprocessor to enable an extremely fine-grain dynamic power management in a few hundred microseconds. This makes it possible to match the load current with the MPP current. We present detailed modeling, simulation, and optimization of the proposed energy harvesting system including the radio frequency transceiver. Experiments show that the proposed setup achieves an 87.1% of overall system efficiency during a day, 30.6% higher than the conventional MPPT methods in actual measurements, and thus a significantly higher duty cycle under a weak solar irradiance.</P>
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Sun, Zewei,Wang, Zaisen,Zhong, Qingzhen,Zhou, Daowei Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.6
The nutrient composition of pasture, voluntary intake and digestibility of diet ingested by goats grazing on an introduced Leymus chinensis pasture were measured across spring (May), summer (July), autumn (October) and winter (March). In each season, 12 Inner Mongolian Cashmere goats (6 wethers and 6 does with an average live weight of $22.2{\pm}1.3$ kg and $19.5{\pm}0.8$ kg, respectively) were used to graze on a 2 hectares size paddock. Diet selection was observed and the plant parts selected by grazing goats and whole plant L. chinensis were sampled simultaneously. The alkane pair $C_{32}:C_{33}$ and $C_{36}$ were used to estimate intake and digestibility, respectively. The results showed that the plant parts selected by goats had higher crude protein (CP) and lower acid detergent fiber (ADF) and neutral detergent fiber (NDF) than the whole plant, especially in the autumn and winter. The voluntary intake of dry matter (DM), CP, ADF, NDF, and metabolizable energy (ME) by goats was highest in summer (p<0.05). The goats ingested more CP, ME, and less ADF in spring than in autumn (p<0.05). The intakes of DM, CP, and ME were lowest in winter (p<0.05). There were significant differences in nutrient intake between wethers and does in each season, except for the ADF and ME intake per metabolic weight ($LW^{0.75}$). The nutrient digestibilities were higher in spring and summer, and decreased significantly during the autumn and winter (p<0.05). Goats, especially wethers, had a relative constant NDF digestibility across seasons, however, the apparent digestibility of CP in both wethers and does, decreased to negative values in winter. The grazing goats experienced relatively sufficient nutrients supply in spring and summer, and a severe deficiency of CP and ME in winter.
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BEFS-PPARγ2 Cells Incubated with trans-11 C18:1 Exhibit More Beneficial Fatty Acid Synthesis
Tao Wang,이홍구,LiFang Wu,GuiXin Qin,Yujie Lou,Zewei Sun,Wei Guo,Jian Yang 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.5
Responses of the PPARγ2 (an adipogenic lineage determinant) over-expressed immortalized bovine embryonic fibroblast cell line (BEFS-PPARγ2 cells) to trans-11 C18:1 (TVA) incubation were evaluated. BEFS-PPARγ2 cells were well differentiated. Stearoyl-CoA desaturase 1, an endoplasmic reticulum enzyme that can catalyze conversion of TVA into cis-9, trans-11 CLA, exhibited a significantly (p<0.05) higher mRNA expression after 4 h, compared with controls. Enzyme activity peaked, and was significantly (p<0.05) higher after 6 h, compared with controls. With extension of the incubation time, TVA absorption into cells was significantly (p<0.05) higher with significantly (p<0.05) more conversion into cis-9, trans-11 CLA, compared with shorter incubation times. TVA incubated cells exhibited significantly (p<0.05) higher levels of arachidonic, eicosapentaenoic, and docosahexaenoic acids than controls. BEFS-PPARγ2 cells can be used as a model system and TVA incubation is a good approach for research into cis-9, trans-11 CLA-fortified beef production.
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Aerodynamic drag reduction based on static traveling wave structure
Xingjun Hu,Zewei Wang,Jiuchao Li,Guo Yu,Jingyu Wang,Wei Lan,Jinglong Zhang,Pengzhan Ma 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5
To explore the influence of the traveling wave parameters on the aerodynamic characteristics of Ahmed models, the geometric model of the traveling wave wall is used as the study object, and the influence of the traveling wave geometric parameters on aerodynamic drag is studied by numerical simulation. A cosine-type traveling wave digital model is established on the basis of Ahmed’s original model. Results show that the static traveling wave structure can play a good role in reducing drag under some driving conditions. The traveling wave’s drag reduction characteristics are affected by the layout position, depth, wavelength, and other related parameters and more affected by driving speed. Finally, a group of working conditions with good drag reduction effects is selected, and the principle of drag reduction by using static traveling wave structure is explained qualitatively and quantitatively through velocity field, shear stress, and pressure field.
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Bacterial Cellulose Immobilized S. cerevisiae as Microbial Sensor for Rapid BOD Detection
Chenyu Zhao,Guangshu Wang,Mengtao Sun,Zewei Cai,Zichu Yin,Yurong Cai 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5
As one of the most important parameters to characterize the organic pollution of water, biochemical oxygendemand (BOD) determined through a rapid, in situ and on line method is very attractive. In this paper, a new BOD biosensorhas been developed, which are composed of the ecofriendly precursor of Saccharomyces cerevisiae (S. cerevisiae) embeddedin bacterial cellulose (BC) matrix and the Ketjen Black (KB) modified glassy-carbon electrode. Furthermore, a doublemediatorsystem is constructed using potassium ferricyanide and menadione in reaction cell to transfer electron from themicrobe to electrode. The responses of glucose glutamic acid (GGA) standard solutions are amperomertrically measured withan applied potential of 0.25 V versus Hg/Hg2Cl2 in a three-electrode system. Under the optimum conditions, the (BC/S. cerevisiae-menadione)/KB modified electrode shows a high operational stability with relative standard deviation (RSD) of4.16 % (fourteen assays), a good repeatability (RSD=3.10 %), a fast response time (in 20 minutes) and a wide linear range(from 10-220 mg O2 l-1). The BOD values measured by this method have been highly correlated with the standard BOD 5-daymethod for wastewater samples (R2=0.9859, n=3), indicating that it can meet the requirement of BOD rapid measurement.
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