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Search Results: 1 - 10 of 36290 matches for " Meng Wen "
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Electronic Transport Properties of Transition-Metal Terminated Trigonal Graphene Nanoribbons  [PDF]
Fanhua Meng, Minghua Zhang, Wen Liu
Journal of Modern Physics (JMP) , 2016, DOI: 10.4236/jmp.2016.711122
Abstract: With the non-equilibrium Green’s function method and density functional theory, we have studied the electronic properties of trigonal graphene nanoribbons, with Fe terminal and H terminal, coupled to gold electrodes. Rectification behavior can be observed when the electrode-molecule contact distance is larger than 2.2 Å. The electronic transport is greatly improved in case of Fe terminal which is analyzed in terms of transmission spectra and density of states.
Virtual Simulation Experiment Design under the Guidance of Emotional Design Theory  [PDF]
Ting Lan, Fuan Wen, Meng Huang
Journal of Software Engineering and Applications (JSEA) , 2019, DOI: 10.4236/jsea.2019.123004
Abstract: In recent years, virtual simulation experiments have been widely used in education. However, at present, academic research on virtual simulation experiments mostly focuses on key technologies, and there are few emotional studies on virtual experiments. Based on the three-layer model of emotional design theory, this paper puts forward the method strategy of emotional simulation design in virtual simulation experiment, in order to provide some reference value for the design of virtual simulation experiment.
Fault Prediction of Elevator Door System Based on PSO-BP Neural Network  [PDF]
Penggao Wen, Meng Zhi, Guangyao Zhang, Shengmao Li
Engineering (ENG) , 2016, DOI: 10.4236/eng.2016.811068
Abstract: Nowadays, the elevator has become an indispensable means of indoor transportation in people’s life, but in recent years this kind of traffic tools has caused many casualties because of the gate system fault. In order to ensure the safe and reliable operation of the elevator, the failure of elevator door system was predicted in this paper. Against the fault type of elevator door system: elevator door opened, excessive vibration when elevator door opened or closed, elevator door did not open or closed when reached the specified level. Three fault types were used as the output of the prediction model. There were 8 reasons for the failure, used them as input. A model based on particle swarm optimization (PSO) and BP neural network was established, using MATLAB to emulation; the results showed that: PSO-BP neural network algorithm was feasible in the fault prediction of the elevator door system.
Identification of a constitutional mutation in the WT1 gene in Taiwanese patients with Wilms tumor  [PDF]
Meng-Yao Lu, Wen-Chung Wang, Chiao-Wen Lin, Alice Chang, Yen-Chein Lai
Advances in Bioscience and Biotechnology (ABB) , 2014, DOI: 10.4236/abb.2014.53029
Abstract:

The overall frequency of WT1 gene alterations in Wilms tumor is still unclear in Taiwan. Here we conducted molecular genetic analysis of the WT1 gene in Taiwanese patients with Wilms tumor. Polymerase chain reaction and direct sequencing were performed on DNA samples from blood and paraffin-embedded tumor specimens. A constitutional mutation in the WT1 gene was found in one DNA sample from peripheral blood lymphocytes. The remaining DNA samples from peripheral blood lymphocytes and paraffin-embedded tumor specimens were tested negative for both constitutional mutations and somatic mutations. Thus, mutations at other Wilms tumor loci may play an important role in Wilms tumor development.

Design of Low Power CMOS LNA with Current-Reused and Notch Filter Topology for DS-UWB Application  [PDF]
Meng-Ting Hsu, Jhih-Huei Du, Wen-Chen Chiu
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.33024
Abstract: This paper presents the design of a low power LNA with second stage that uses a notch filter for DS-UWB application. The LNA employs a current reuse structure to reduce the power consumption and an active second order notch filter to produce band rejection in the 5 - 6 GHz frequency band. The input reflection coefficient S11 and output reflection S22 are both less than –10 dB. The maximum power gain S21 is 15 dB while the maximum rejection ratio is over –10 dB at 4.8 GHz. The minimum noise figure is 5 dB. The input referred third-order intercept point (IIP3) is –7 dBm at 6 GHz. The power consumption is 6.4 mW from a 1-V power supply.
Convergence of Implicit and Explicit Schemes for an Asymptotically Nonexpansive Mapping in -Uniformly Smooth and Strictly Convex Banach Spaces
Meng Wen,Changsong Hu,Zhiyu Wu
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/474031
Abstract: We introduce a new iterative scheme with Meir-Keeler contractions for an asymptotically nonexpansive mapping in -uniformly smooth and strictly convex Banach spaces. We also proved the strong convergence theorems of implicit and explicit schemes. The results obtained in this paper extend and improve many recent ones announced by many others.
Scale dependence of tensile strength of micromachined polysilicon MEMS structures due to microstructural and dimensional constraints
Jianning Ding,Yonggang Meng,Shizhu Wen
Chinese Science Bulletin , 2001, DOI: 10.1007/BF03183397
Abstract: The success of microelectromechanical systems (MEMS) as a key technology in the 21st century depends in no small part on the solution of materials issues associated with the design and fabrication of complex MEMS devices. The reliable mechanical properties of these thin films are critical to the safety and functioning of these microdevices and should be accurately determined. In order to accomplish a reliable mechanical design of MEMS, a new microtensile test device using a magnetic-solenoid force actuator was developed to evaluate the mechanical properties of microfabricated polysilicon thin films with dimensions of 100–660 μm length, 20–200 μm width, and 2.4 μm thickness. It was found that the measured average value of Young’s modulus, 164 ±1.2 GPa, falls within the theoretical bounds. The average fracture strength is 1.36 GPa with a standard deviation of 0.14 GPa, and the Weibull modulus is 10.4–11.7, respectively. Statistical analysis of the specimen size effect on the tensile strength predicated the size effect on the length, the surface area and the volume of the specimens due to microstructural and dimensional constraints. The fracture strength increases with the increase of the ratio of surface area to volume. In such cases the size effect can be traced back to the ratio of surface area to volume as the governing parameter. The test data account for the uncertainties in mechanical properties and may be used in the future reliability design of polysilicon MEMS. The testing of 40 specimens to failure results in a recommendation for design that the nominal strain be maintained below 0.0057.
A Hybrid Method for the Analysis of Radome-Enclosed Horn Antenna
Hong Fu Meng;Wen-Bin Dou
PIER , 2009, DOI: 10.2528/PIER08122502
Abstract: In this paper, the hybrid physical optics/boundary integral-finite element-mode matching (PO/BI-FE-MM) method is proposed for the analysis of the horn antenna enclosed by the electrically large radome. The radome is modeled by the PO method, and the BI-FE-MM method is implemented to the horn region. The equivalent PO currents on the radome surface are coupled into the BI-FE-MM equation of the horn region to account for the effects of the radome on the horn. With this hybrid method, the mutual interactions between the radome and the horn are fully considered. The radiation patterns, field distributions, and the S-parameters of the horns enclosed by different kinds of radome are presented.
Fast Analysis of Electrically Large Radome in Millimeter Wave Band with Fast Multipole Acceleration
Hong Fu Meng;Wen-Bin Dou
PIER , 2011, DOI: 10.2528/PIER11081101
Abstract: Radome has strong effects on the radiation performances of the antenna in millimeter wave band. In this paper, the aperture integration-surface integration (AI-SI) method is adopted to analyze the electrically large antenna-radome system. The fast multipole method (FMM) is proposed to accelerate the aperture integration and inner surface integration in the AI-SI method. An electrically large antenna-radome system at W band is analyzed and measured. The radiation patterns of the system calculated using the AI-SI method with and without the fast multipole acceleration and the measured patterns are compared. The calculated patterns agree very well with each other, and both have the same agreement with the experimental results. However, the computational time of the proposed analysis with the fast multipole acceleration is reduced significantly.
Multi-timescale Collaborative Optimization of Distribution, Distributed Generation and Load in Microgrid  [PDF]
Wen Hu, Yun-lian Sun, Yang Wang, Yang-jun Zhou, Meng-ying Wang
Open Journal of Applied Sciences (OJAppS) , 2013, DOI: 10.4236/ojapps.2013.32B003
Abstract: The distribution loads, output of distributed generations (DGs) and dynamic power price present obvious time-sequence property, the typical property is studied in this paper. The model of microgrid (including adjustable load, DGs, storage and dynamic power price) is studied. A multi-timescale collaborative optimization model is built towards microgrid; main measures in different timescale optimization are realized. An improved adaptive genetic algorithm is used to solve the optimization problem, which improved the efficiency and reliability. The proposed optimization model is simulated in IEEE 33 node system; the results show it’s effective.
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