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137 results on '"Tang, Yumei"'

18. Visual Search on E-commerce Category Navigation: A Multi-language Study

Author

Liu, Bin, Cao, Lijuan, Tang, Yumei, Zhong, Ming, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Kobsa, Alfred, editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Weikum, Gerhard, editor, and Rau, P. L. Patrick, editor

Published
2014
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19. Effect of Pretreatments on Releasing of Bound Phenolics from Dried Bamboo Shoots during Simulated In Vitro Colonic Fermentation.

Author

Xiao, Jianping, Li, Anping, Tang, Yumei, Cheng, Hexingzi, Yang, Pei, and Liu, Hanze

Subjects
BAMBOO shoots, CHLOROGENIC acid, HEMICELLULOSE, PHENOLS, SHORT-chain fatty acids, VALERIC acid, FERMENTATION, LIGNOCELLULOSE
Abstract

Salt-dried bamboo shoots (SDBS), steamed dried bamboo shoots (TDBS), fumigation-dried bamboo shoots (UDBS), and fermentation-dried bamboo shoots (FDBS) are four popular types of dried bamboo shoots (DBS) enjoyed by Chinese people. In this work, we aimed at investigating the release pattern of bound phenolics from DBS prepared by different processes on simulated in vitro colonic fermentation. The results showed that nine phenolic compounds were identified from DBS, including seven phenolic acids and two flavonoids. Also, the contents of chlorogenic acid, p-coumaric acid, and ferulic acid were higher. Among the four types of DBS, FDBS exhibited the highest release of bound phenolics during colonic fermentation, with a value of 3.619 mg GAE/g DW. In addition, all the DBS produced four short-chain fatty acids (SCFAs), with the highest content of acetic acid at 7.721 mmol/L, followed by propionic acid and valeric acid, and the lowest content of butyric acid at only 0.023 mmol/L, along with a gradual decrease in their cellulose, hemicellulose, and lignin contents. Concurrently, confocal laser scanning microscopy (CLSM) observation images showed that reduced red fluorescence exhibited a decrease in bound phenolics content, while reduced green fluorescence indicated a decrease in fiber content. A significant positive correlation (P < 0.05) was observed between the release of bound phenolics and total SCFA production during colonic fermentation of SDBS, TDBS, UDBS, and FDBS, with correlation coefficients of 0.632, 0.844, 0.717, and 0.916, respectively, and a significant negative correlation (P < 0.05) with the IC50 values for the inhibition of α-amylase and α-glucosidase, with correlation coefficients of −0.643, −0.613, −0.823, and −0.839, respectively. The four DBS were ranked in descending order of bound phenolic release, SCFA production, dietary fiber reduction, and inhibitory activity associated with the metabolic syndrome: FDBS, TDBS, SDBS, and UDBS. DBS released large amounts of bound phenolics and produced SCFAs during colonic fermentation, which might be potentially beneficial for maintaining intestinal microbiota balance. [ABSTRACT FROM AUTHOR]

Published
2023
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33. Multi-channel Precision Voltage Source for Experiments on Quantum Dots

Author

Tang, Yumei and Liu, Kefu

Subjects
other
Abstract

To realize precise control of single quantum dots (Qdots) device, the high-performance bias source play the key role. In this paper, the 16-channel high precision voltage bias source prototype for Qdots device with 18-bit resolution was designed. The prototype was made and its performance was tested. The short time fluctuations can reach 50μV. The up-step and the down-step response time can achieve less than 3μs. The stability, linearity and setting time of the bias source exhibits good performance. What's more, the voltage bias source can be controlled by local and online. The results show that it is one effective and feasible topology for the high precision voltage bias source in Qdots device application.

Published
2021

42. Construction of MnxCoyO4/Ti electrocatalysts for efficient bifunctional water splitting.

Author

Huang, Qiuping, Jiang, Mingjiao, Li, Yingjia, Liang, Chao, Tang, Yumei, Xie, Fengyu, Yang, Min, and Deng, Guowei

Subjects
ELECTROCATALYSTS, HYDROGEN evolution reactions, HYDROGEN as fuel, ALKALINE solutions, CATALYTIC activity, ENERGY development
Abstract

In this work, we report the design and synthesis of non-noble metal-based electrocatalysts for effective overall water splitting in alkaline solutions for the development of hydrogen energy. The electrocatalysts were synthesized by a one-step hydrothermal method similar to microflower structure electrocatalysts. The synergistic effect between the special Echinops sphaerocephalus nanostructure and the nanowire can greatly improve the conductivity of the nanomaterial due to its high activity quality, fast ion transport, and exposure of more active sites, thus resulting in a better catalytic activity and a longer material stability of the electrocatalyst. For MnxCoyO4/Ti in alkaline aqueous solutions, a current density of 10 mA cm−2 is required when the voltage is only 1.60 V. In addition, the hydrogen evolution activity of electrocatalysts is 168 mV at 10 mA cm−2, the Tafel slope is 174 mV dec−1, and the oxygen evolution activity of electrocatalysts is 229 mV at 10 mA cm−2, which showed good long-term stability within 12 h, even better than that of previously reported electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2022
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47. Wide dynamic laser ranging based on diode laser and photon-counting techniques

Author

Liu Kefu, Yang Runze, Tang Yumei, and Qiu Jian

Subjects
Materials science, business.industry, Stray light, Dynamic range, Laser, 500 kHz, Atomic and Molecular Physics, and Optics, Photon counting, law.invention, Semiconductor laser theory, Time of flight, Optics, law, Electrical and Electronic Engineering, business, Engineering (miscellaneous), Ultrashort pulse
Abstract

Ultrafast diode laser and photon-counting techniques were united to solve the trade-off between the dynamic range and high precision in the time of flight (TOF) laser ranging. Based on the direct time of flight (D-TOF) laser ranging method, we developed a wide dynamic laser ranging system. The peak power of the emission laser can reach 70 W, the width of pulsed laser is less than 2 ns, and the repetition rate can reach 500 kHz. The experimental results show that the precision is 7.5 mm when the echo signal is saturated. The maximum range can reach kilometer level, the accuracy is within 30 cm, and the repetition rate of measurement can reach 100 kHz. The system has the advantages of small size, low cost, fast detection speed, and high accuracy, which can be used in the fields of dynamic target measurement and high-speed environment perception.

Published
2021

48. MiR-32-5p Regulates Radiosensitization, Migration And Invasion Of Colorectal Cancer Cells By Targeting TOB1 Gene

Author

Liang,Hong, Tang,Yumei, Zhang,Hui, Zhang,Chao, Liang,Hong, Tang,Yumei, Zhang,Hui, and Zhang,Chao

Abstract

Hong Liang,* Yumei Tang,* Hui Zhang, Chao Zhang Department of Gastrointestinal Surgery, Henan Provincial People’s Hospital, People’s Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou, Henan 450003, People’s Republic of China*These authors contributed equally to this workCorrespondence: Chao ZhangDepartment of Gastrointestinal Surgery, Henan Provincial People’s Hospital, People’s Hospital of Zhengzhou University, School of Clinical Medicine, Henan University, Zhengzhou 450003, People’s Republic of ChinaEmail yuyelouduan@163.comBackground: MicroRNAs (miRNAs) play key roles in the development and progression of various cancers. However, the precise functions and regulation mechanisms of miRNAs in human tumors remain elusive.Methods: Quantitative real time-PCR (qRT-PCR) was performed to detect the level of miR-32-5p in colorectal cancer tissues. The relationships between miR-32-5p level with clinicopathological characteristics and prognosis were analyzed. The miR-32-5p inhibitor was employed to knock down the expression of miR-32-5p. The overexpression plasmid and si-RNA targeting TOB1 were generated. Clone formation assays under radiant exposure were used to evaluate the radiosensitization. Transwell migration and invasion were employed to test the ability of cell migration and invasion. Luciferase reporter assays were used to confirm the regulation of miR-32-5p on the expression of TOB1. Rescue experiments were conducted to investigate the effects of TOB1 on the functions of miR-32-5p.Results: In this study, we found that miR-32-5p was significantly upregulated in colorectal cancer tissues compared with adjacent normal tissues. The level of miR-32-5p was positively correlated with tumor differentiation and metastasis. Log-rank tests showed that high level of miR-32-5p was significantly correlated with poor overall survival and disease-free survival. Anti-miR-32-5p rema

Published
2019

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