Wyniki wyszukiwania dla: Weifeng Zheng

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Crosstalk between heat shock factor 1 and signal transducer and activator of transcription 3 mediated by interleukin‐8 autocrine signaling maintains the cancer stem cell phenotype in liver cancer

Zhengyan Yang, Wenjuan Wan, Pai Zhang, Shuangfeng Wang, więcej

Journal of Gastroenterology and Hepatology > 38 > 1 > 138 - 152

Background and Aim Liver cancer stem cells (LCSCs) cause therapeutic refractoriness and relapse in hepatocellular carcinoma. Heat shock factor 1 (HSF1) plays versatile roles in multiple cancers. However, the role of HSF1 in LCSCs is not well understood. This study investigated the function and signal mechanisms of HSF1 in maintaining LCSC phenotypes. Methods We established two LCSC lines, HepG2‐R...

artykuł

Development and Validation of Quantitative Real-Time PCR for the Detection of Residual CHO Host Cell DNA and Optimization of Sample Pretreatment Method in Biopharmaceutical Products

Weifeng Zheng, Lin Jiang, Qing Lei, Jun Yang, więcej

Biological Procedures Online > 2019 > 21 > 1 > 1-7

Background The presence of residual DNA carried by biological products in the body may lead to an increased oncogenicity, infectivity, and immunomodulatory risk. Therefore, current agencies including WHO, EU, and the FDA limited the accepted amounts of residual DNA (less than 10 ng or 100 pg/dose). Among the methods of detecting residual DNA, qPCR is considered to be the most practical for residual...

artykuł

Correlation between native defects and morphological, structural and optical properties of ZnO nanostructures

Limei Lin, Jinyang Liu, Jing Lv, Shuangjuan Shen, więcej

Journal of Alloys and Compounds > 2017 > 695 > C > 1523-1527

ZnO nanostructures are synthesized using chemical vapor deposition method. Well-distributed ZnO nanowires, nanogrenades and nanoislands are obtained by altering the temperature of joining the reactant gas O₂ from 550 to 570 and 600 °C, respectively. The structural properties are derived from the X-ray diffraction patterns and Raman spectra. It is indicated that all the samples are c-oriented wurtzite...

artykuł

Total Synthesis of Notoamides F, I, and R and Sclerotiamide

Benxiang Zhang, Weifeng Zheng, Xiaoqing Wang, Deqian Sun, więcej

Angewandte Chemie > 128 > 35 > 10591 - 10594

The total synthesis of the natural indole alkaloids (+)‐notoamide F, I, and R and (−)‐sclerotiamide is described. The four heptacyclic compounds were synthesized in 10–12 steps in a convergent and highly stereoselective manner from the readily available Seebach acetal. Key steps of the synthesis include a stereoselective oxidative aza‐Prins cyclization to construct the bicyclo[2.2.2]diazaoctane, and...

artykuł

Total Synthesis of Notoamides F, I, and R and Sclerotiamide

Benxiang Zhang, Weifeng Zheng, Xiaoqing Wang, Deqian Sun, więcej

Angewandte Chemie International Edition > 55 > 35 > 10435 - 10438

rozdział

Simulation and Development Environment for Digital Controlled PMSM Servo System

Shuanghui Hao, Weifeng Zheng, Minghui Hao, Jie Liu, więcej

Lecture Notes in Computer Science > Intelligent Robotics and Applications > Manufacturing Automation > 566-575

The robotic manipulator with digital controlled PMSM servo system has many advantages: low weight, fast response, high load rate, low power consumption, low probability of damage (less bumping). To get high-powered and low-cost PMSM servo system for robotic, a simulation and development environment based on personal computer is present in this paper. The environment is integrated with the platform...

rozdział

Research on the Thermal Error of the 3D-Coordinate Measuring Machine Based on the Finite Element Method

Shuanghui Hao, Jizhu Liu, Baoyu Song, Minghui Hao, więcej

Lecture Notes in Computer Science > Intelligent Robotics and Applications > Manufacturing Automation > 440-448

3D-coordinate Measuring Machine (CMM) is affected by various heat sources in high-speed measuring, which results in deformation of the machine and measurement errors. This paper makes a theoretical analysis on the thermal error produced during the CMM’s work process. And the thermal deformation of CMM is analyzed with Finite Element Method (FEM). A thermal error compensation model is also established...

artykuł

Optical properties and thermal stability of colored solar selective absorbing coatings with double-layer antireflection coatings

Ruihua Yang, Jinyang Liu, Limei Lin, Yan Qu, więcej

Solar Energy > 2016 > 125 > C > 453-459

Multilayer solar selective absorbing coatings of Cu/Ti/SiO₂/Ti/TiO₂/SiO₂ were designed first and then deposited on quartz substrates using the magnetron sputtering method. The thicknesses of the individual layers were optimized to achieve high solar absorptance, while the colors were designed with the TFCalc optical design software. The colors of the coatings including purple, blue, blue green, yellow...

artykuł

An electrochemical constructed p-Cu2O/n-ZnO heterojunction for solar cell

Sujuan Chen, Limei Lin, Jinyang Liu, Peiwei Lv, więcej

Journal of Alloys and Compounds > 2015 > 644 > C > 378-382

This article demonstrates a facile method to fabricate a solar cell based on p-Cu₂O/n-ZnO heterostructure, which was constructed through n-ZnO layer deposition by radio frequency magnetron sputtering and subsequent p-Cu₂O film cover by electrochemical deposition with two electrodes. The applied potential and deposition time of the Cu₂O were investigated and it was found to be critical to the morphologies,...

artykuł

Controllable Growth of the Graphene from Millimeter-Sized Monolayer to Multilayer on Cu by Chemical Vapor Deposition

Jinyang Liu, Zhigao Huang, Fachun Lai, Limei Lin, więcej

Nanoscale Research Letters > 2015 > 10 > 1 > 1-8

As is well established, mastery to precise control of the layer number, stacking order of graphene, and the size of single-crystal monolayer graphene is very important for both fundamental interest and practical applications. In this report, millimeter-sized single-crystal monolayer graphene has been synthesized to multilayer graphene on Cu by chemical vapor deposition. The relationship of the growth...

artykuł

Evidence-based review of photodynamic therapy in the treatment of acne

Weifeng Zheng, Yan Wu, Xuegang Xu, Xinghua Gao, więcej

European Journal of Dermatology > 2014 > 24 > 4 > 444-456

Background Photodynamic therapy (PDT) has been used for acne, however, the efficacy and safety need to be determined. Objective To assess the effects and safety of PDT for acne using an evidence-based approach. Methods Randomized controlled trials (RCTs) on the treatment of acne with PDT were identified by searching PubMed, CNKI and the Cochrane Library. Results A total of 14 RCTs involving...

artykuł

Photosensitivity of ZnO/Cu2O thin film heterojunction

Peiwei Lv, Limei Lin, Weifeng Zheng, Mingzhi Zheng, więcej

Optik - International Journal for Light and Electron Optics > 2013 > 124 > 17 > 2654-2657

ZnO/Cu ₂ O thin film n–i–p heterojunctions were fabricated by magnetron sputtering. The microstructure and optical properties of n-ZnO and i-ZnO films deposited on glass substrates were characterized by X-ray diffraction (XRD) and spectrophotometer, respectively. The current–voltage (I–V) characteristics of two ZnO/Cu ₂ O n–i–p heterojunctions were investigated, which n-ZnO layer thicknesses...

artykuł

Colored solar selective absorbing coatings with metal Ti and dielectric AlN multilayer structure

Yangwei Wu, Weifeng Zheng, Limei Lin, Yan Qu, więcej

Solar Energy Materials and Solar Cells > 2013 > 115 > Complete > 145-150

The colored solar–thermal collectors have the advantages of architectural integration and color appearance. The solar selective absorbing coatings with a metal–dielectric multilayer structure can show different colors by changing the layer number and thickness. In this work, five colored coatings with a metal titanium (Ti) and dielectric aluminum nitride (AlN) multilayer structure were designed by...

rozdział

Personal asset tracking

Weifeng Zheng, Xuan Wang, Ridha Kamoua

2013 IEEE Long Island Systems, Applications and Technology Conference (LISAT) > 1 - 6

2013 IEEE Long Island Systems, Applications and Technology Conference (LISAT)

We aim to design and provide a compact security system for keeping track of personal belongings or assets. If a registered asset is out of a range of 5 feet, the monitoring system will alert the user. The tracking system is mainly composed of a mobile transmitting module and a receiving module carried by a person. Personal objects (such as passport, mobile phones, laptops and portable devices) are...

artykuł

Growth and optical properties of ZnO nanorod arrays on Al-doped ZnO transparent conductive film

Suanzhi Lin, Hailong Hu, Weifeng Zheng, Yan Qu, więcej

Nanoscale Research Letters > 2013 > 8 > 1 > 1-6

ZnO nanorod arrays (NRAs) on transparent conductive oxide (TCO) films have been grown by a solution-free, catalyst-free, vapor-phase synthesis method at 600°C. TCO films, Al-doped ZnO films, were deposited on quartz substrates by magnetron sputtering. In order to study the effect of the growth duration on the morphological and optical properties of NRAs, the growth duration was changed from 3 to 12...

artykuł

I–V characteristics of ZnO/Cu2O thin film n–i–p heterojunction

Peiwei Lv, Weifeng Zheng, Limei Lin, Fuchuan Peng, więcej

Physica B: Physics of Condensed Matter > 2011 > 406 > 6-7 > 1253-1257

ZnO/Cu ₂ O thin film n–i–p heterojunctions were fabricated by magnetron sputtering. The microstructure, optical, and electrical properties of n-type (n‐) ZnO, insulating (i‐) ZnO, and p-type (p‐) Cu ₂ O films deposited on glass substrates were characterized by X-Ray diffraction (XRD), spectrophotometer, and the van der Pauw method, respectively. XRD results show that the mean grain...

rozdział

SPSS-based study on the individual stressor of the supervision staffs

Ping Dong, Weifeng Zheng

2010 International Conference on Optics, Photonics and Energy Engineering (OPEE) > 2 > 480 - 483

2010 International Conference on Optics, Photonics and Energy Engineering (OPEE 2010)

with the rapid society development, construction enterprise has become one of the most important industries and been widely recognized. But the importance of the supervision enterprise of construction hasn't been recognized. The stresses of the supervision staffs bearing haven't been known. In this paper, we only considered the influences of individual stressor of the supervision staffs. Through a...

rozdział

Propulsive and maneuvering performance of two joints biorobotic autonomous undersea vehicle SPC-III

Jianhong Liang, Weifeng Zheng, Li Wen, Tianmiao Wang, więcej

2009 IEEE International Conference on Robotics and Biomimetics (ROBIO) > 314 - 320

2009 IEEE International Conference on Robotics and Biomimetics (ROBIO 2009)

Biorobotic autonomous undersea vehicle SPC-III, developed by Robotics institute, BeiHang University, is a mission-scale autonomous submersible vehicle. The submersible vehicle possesses a torpedo-shape rigid hull. The aft section is a two joints caudal fin thruster driven by two servo motors, which may be substituted by a screw propeller maintaining the same body shape. The accurate motion of the...

rozdział

Study on High-Power Linear Motor Optimal Design

Jizhu Liu, Shuanghui Hao, Weifeng Zheng, Minghui Hao, więcej

2009 Second International Conference on Intelligent Computation Technology and Automation > 3 > 98 - 102

2009 Second International Conference on Intelligent Computation Technology and Automation (ICICTA)

Electromagnetic launch is a new technology which is used in aircraft carrier to replace traditional steam launch, designing a high-power linear motor is the key point of this technology. After analyzing the structure and framework of various linear motors, the design scheme which adopting dynamic permanent magnet AC synchronous linear motor with three-dimensional matrix bilateral structure had been...

rozdział

Same cycle servo control system based on built-in NC

Shuanghui Hao, Jizhu Liu, Weifeng Zheng, Minghui Hao, więcej

2009 IEEE International Conference on Automation and Logistics > 455 - 459

2009 IEEE International Conference on Automation and Logistics (ICAL)

For the high-performance and low-cost AC servo system, the electrocircuit and control software are designed in this paper. Combined with the arithmetic of vector control, the NC instruction is embedded in the control model. Also, the NC instruction, machine loop and current loop are successfully achieved in the same control circle, and the time of control circle is determined in the 60 us. The response...

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Wyniki wyszukiwania dla: Weifeng Zheng

Crosstalk between heat shock factor 1 and signal transducer and activator of transcription 3 mediated by interleukin‐8 autocrine signaling maintains the cancer stem cell phenotype in liver cancer

Development and Validation of Quantitative Real-Time PCR for the Detection of Residual CHO Host Cell DNA and Optimization of Sample Pretreatment Method in Biopharmaceutical Products

Correlation between native defects and morphological, structural and optical properties of ZnO nanostructures

Total Synthesis of Notoamides F, I, and R and Sclerotiamide

Total Synthesis of Notoamides F, I, and R and Sclerotiamide

Simulation and Development Environment for Digital Controlled PMSM Servo System

Research on the Thermal Error of the 3D-Coordinate Measuring Machine Based on the Finite Element Method

Optical properties and thermal stability of colored solar selective absorbing coatings with double-layer antireflection coatings

An electrochemical constructed p-Cu2O/n-ZnO heterojunction for solar cell

Controllable Growth of the Graphene from Millimeter-Sized Monolayer to Multilayer on Cu by Chemical Vapor Deposition

Evidence-based review of photodynamic therapy in the treatment of acne

Photosensitivity of ZnO/Cu2O thin film heterojunction

Colored solar selective absorbing coatings with metal Ti and dielectric AlN multilayer structure

Personal asset tracking

Growth and optical properties of ZnO nanorod arrays on Al-doped ZnO transparent conductive film

I–V characteristics of ZnO/Cu2O thin film n–i–p heterojunction

SPSS-based study on the individual stressor of the supervision staffs

Propulsive and maneuvering performance of two joints biorobotic autonomous undersea vehicle SPC-III

Study on High-Power Linear Motor Optimal Design

Same cycle servo control system based on built-in NC

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