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Now showing items 129 - 144 of 1780

  • Direct hydroxylation of benzene to phenol over metal oxide supported graphene oxide catalysts

    Wang, Cheng   Hu, Liya   Hu, Yichen   Ren, Yuanhang   Chen, Xueying   Yue, Bin   He, Heyong  

    Highlights • A series of metal oxide supported graphene oxide catalysts were prepared. • The metal oxide nanoparticles were highly dispersed on graphene oxide sheets. • V, Fe and Cu supported catalysts were compared in direct hydroxylation of benzene. • V/GO exhibited the highest efficiency in the titled reaction. Abstract A series of metal oxide (V, Fe, Cu) supported graphene oxide (M/GO) catalysts have been prepared by the impregnation method. The catalysts were characterized by TEM, XRD, FT-IR, and Raman spectroscopies and the results showed that the metal oxide nanoparticles were highly dispersed and successfully incorporated on graphene oxide sheets. Among the catalysts, V/GO exhibited the highest efficiency in direct hydroxylation of benzene using H2O2 as an oxidant in acetic acid solvent with a phenol yield of 22.7% and a selectivity of 98.4% under the optimized condition along with good recycle performance.
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  • Proton Exchange Membrane Fuel Cells with Carbon Nanotube Based Electrodes

    Wang, Cheng   Waje, Mahesh   Wang, Xin   Tang, Jason M.   Haddon, Robert C.   Yan,  

    The use of multiwalled carbon nanotubes as a platinum support for proton exchange membrane fuel cells has been investigated as a way to reduce the cost of fuel cells through an increased utilization of platinum. Carbon nanotubes were selectively grown directly on the carbon paper by chemical vapor deposition with electrodeposited cobalt catalyzing the growth of the carbon nanotubes. The as-prepared carbon nanotubes were employed as the support for the subsequent platinum catalyst, which is electrodeposited on the carbon nanotubes. Physicochemical and electrochemical characterizations were conducted to identify the morphologies of the cobalt, the carbon nanotubes, and the electrodeposited platinum on the carbon nanotubes. The feasibility of a fuel cell using the carbon nanotube-based electrodes was demonstrated.
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  • A linear regression method for tree canopy height estimation using airborne lidar data

    Wang, Cheng   Glenn, Nancy F  

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  • Synthesis and nonvolatile memristive switching effect of a donor–acceptor structured oligomer

    Wang, Cheng   Liu, Gang   Chen, Yu   Li, Run-Wei   Zhang, Wenbin   Wang, Luxin   Zhang, Bin  

    As promising nonlinear dynamic electronic devices with widespread potential applications in computer data storage and neuromorphic implementations, memristors have attracted tremendous attention in both materials science and condensed-matter physics. In this work, self-rectified memristive behavior was for the first time observed in a highly soluble metal-free all-organic material containing electron-rich fluorene and dithieno[3,2-b:2',3'-d] pyrrole moieties in the oligomer mainchain as conjugated channels for charge carriers and electron-poor 9,9-bis(3,4-bis(3,4-dicyanophenoxy) phenyl side chains in the C-9 position of the fluorene units (hereafter denoted as "PFD-8CN"). Electrical conductance of PFD-8CN can be switched between two states with a rectification ratio of similar to 10, incrementally and repeatedly. Nonlinear transmission characteristics of a biological synapse are also realized through consecutive multilevel conductance switchings. The novel electrical response of the device arises from electric fieldinduced charge transfer interactions in the donor-acceptor structured oligomer. The development of the organic memristor may offer new opportunities for the construction of molecular electronics that can greatly enhance the performance of modern computer systems.
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  • Intramolecular alkyne–dithiolium cycloaddition: a joint experimental and DFT mechanistic study

    Wang, Cheng   Flinn, Christopher   Zhao, Yuming  

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  • PANCREATIC CANCER MARKERS, AND DETECTING METHODS, KITS, BIOCHIPS THEREOF

    The present invention provides microRNAs for assessing the status of pancreatic cancer in a subject, and provides methods, kits, and biochips for detecting said microRNAs.
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  • CEILING TYPE AIR CONDITIONER INDOOR UNIT INSTALLATION METHOD AND CEILING TYPE AIR CONDITIONER

    A ceiling type air conditioner indoor unit installation method and a ceiling type air conditioner. The ceiling type air conditioner indoor unit installation method comprises: hoisting an indoor unit (10) to a roof; forming a ceiling outside the indoor unit (10) to form a ceiling layer (20), wherein the ceiling layer (20) forms an accommodation space for accommodating the indoor unit (10), and an air outlet (21) is formed in the bottom surface of the ceiling layer (20); fixing a first installation frame (31) of an air outlet device (30) into the air outlet (21), wherein the lower bottom surface of the first installation frame (31) does not protrude out of the lower bottom surface of the ceiling layer (20), and the bottom of the first installation frame (31) is provided with a first installation opening; and fixing an air outlet component of the air outlet device (30) into the first installation frame (31) through the first installation opening, wherein the lower bottom surface of the air outlet component is flush with the lower bottom surface of the ceiling layer (20). The ceiling type air conditioner installed according to the ceiling type air conditioner indoor unit installation method can be completely hidden inside the ceiling and is not exposed out.
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  • DETECTION METHOD FOR COMMUNICATION STATES OF IEC104 PROTOCOL OF DISPATCHING AUTOMATION SYSTEM

    The invention relates to a detection method for communication states of an IEC104 protocol of a dispatching automation system. The detection method comprises: (1). in the dispatching automation system, when the IEC104 protocol is used for communication, determining states of IP addresses of an opposite party, automatically selecting an IP address in a normal state to initiate establishment of a TCP/IP link; (2). determining whether a monitor service of a 2404 network port is started for each IP address in the normal state; (3) sending a testing frame message of the IEC104 protocol in each normal TCP/IP network link with a network port number being 2404, and determining, according to a response packet of the opposite party, whether each communication link of the IEC104 protocol is normal; and (4). storing the foregoing states in a database, and the dispatching automation system comprehensively determining, according to the states, an operation state of each IEC104 communication link. The present invention provides a unified and complete system platform for a user, so that the user can comprehensively learn various communication states of the IEC104 protocol on any node of the dispatching automation system, and the system platform is easy to maintain and convenient to operate.
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  • Infrared spectral properties for α-NaYF4 single crystal of various Er3+doping concentrations

    Wang, Cheng   Xia, Haiping   Feng, Zhigang   Zhang, Zhixiong   Jiang, Dongsheng   Zhang, Jian   He, Shinan   Tang, Qingyang   sheng, Qiguo   Gu, Xuemei   Zhang, Yuepin   Chen, Baojiu   Jiang, Haochuan  

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  • Measurement of the matched spot size in a capillary discharge waveguide with a collimated laser

    Liu, Jiaqi   Li, Wentao   Liu, Jiansheng   Qin, Zhiyong   Wang, Wentao   Qi, Rong   Zhang, Zhijun   Yu, Changhai   Fang, Ming   Feng, Ke   Wu, Ying   Wang, Cheng   Li, Ruxin  

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  • Absorption, Pharmacokinetics and Disposition of Biodegradable Nanoscale Preparations

    Wang, Cheng   Wang, Jing   Chen, Tiezhu   Luo, Zhiqiang   Yang, Xuemei   Pan, Xiongfei   Lin, Yunfeng   Qian, Zhiyong   Cai, Xiaoxiao  

    Nowadays, biodegradable nanoscale preparations such as liposomes, micelles, nanoparticles (NPs), and solid lipid nanoparticles (SLN) have attracted increasing attention from major researchers. This article aims to review the absorption, pharmacokinetics, distribution properties and toxicity of the above-mentioned nanoscale preparations and the relative methodology. It may be significant for successful use of more nanoscale preparations in clinical practice.
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  • DOUBLE POINT-FOCUSING SOLAR ENERGY COLLECTION APPARATUS

    A double point-focusing solar energy collection apparatus, comprising: a heat collector (1) which comprises a primary concentrator (11) and a heat collection tube (12), the primary concentrator (11) having a focus point; a secondary concentrator (3), having a focus point; and a support (2), for supporting the primary concentrator (11), the heat collection tube (12), and the secondary concentrator (3). The heat collection tube (12) is located between the secondary concentrator (3) and the primary concentrator (11), and is located at the focus points of the primary concentrator (11) and the secondary concentrator (3). By additionally providing the solar energy collection apparatus with the secondary concentrator (3), which is a rotary parabolic mirror or a circular Fresnel mirror, and positioning the heat collection tube (12) between the secondary concentrator (3) and the primary concentrator (11) and at the focus points of the primary concentrator (11) and the secondary concentrator (3), loss of light is reduced and the heat collecting efficiency is high; after the secondary concentrator (3) is additionally provided, erosion of the heat collection tube (12) due to factors such as sand wind, rain, and snow can be effectively prevented, and the service life of the heat collection tube (12) is effectively prolonged.
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  • GRAPHICAL POWER LINE MONITORING DEVICE AND METHOD

    The invention discloses a graphical power line monitoring device and method implemented by adopting a silicon on chip (SoC) system and a camera connected thereto. The camera is controlled by the SoC to acquire, in real time, an image of a power transmission line, and to transmit the image of the power transmission line to the SoC. The SoC is used to control the camera to acquire, in real time, the image of the power transmission line, encode the image of the power transmission line, and output the same in a wireless manner. Furthermore, the SoC comprises a sleep control module capable of configuring the SoC to enter a sleep mode, thereby reducing power consumption. Since the SoC has small power consumption and is compact in size, when the SoC and the camera are installed to a power line to perform graphical monitoring, power consumption and costs can be reduced. The device is easy to install and has high integrity.
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  • DOUBLE-LINE FOCUSING SOLAR ENERGY COLLECTION APPARATUS

    A double-line focusing solar energy collection apparatus, comprising: a heat collector (1) which comprises a primary concentrator (11) and a heat collection tube (12), the primary concentrator (11) having a focus line; a secondary concentrator (3), having a focus line; and a support (2), for supporting the primary concentrator (11), the heat collection tube (12), and the secondary concentrator (3). The heat collection tube (12) is located between the secondary concentrator (3) and the primary concentrator (11), and is located on the focus lines of the primary concentrator (11) and the secondary concentrator (3).
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  • STORAGE CONTROLLER AND IO REQUEST PROCESSING METHOD

    Provided is a storage controller; said storage controller comprises a distribution core, a plurality of ordering cores, and a request processing core. Said three core types are used respectively for distributing input/output (IO) requests to different ordering cores, generating a processing ordering index for each IO request, and processing each IO request according to the order of the processing ordering index of each IO request, so as to flexibly schedule the IO requests received by the storage controller.
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  • CT THREE-DIMENSIONAL RECONSTRUCTION METHOD AND SYSTEM

    A CT three-dimensional reconstruction method and system. The method comprises: sending to at least two lower-level computers a two-dimensional projection image obtained by performing computed tomography (CT) with at least two rotation angles of an X ray source (210) (110); controlling each of the lower-level computers to compute a projection matrix for each pixel point in the two-dimensional projection image received thereby, and saving the projection matrix to respective internal storages of each of the lower-level computers (120); controlling each of the lower-level computers to compute, on the basis of the projection matrix and a current iteration state of three-dimensional volume data to be reconstructed, an iteration decay component and returning the iteration decay component (130); updating, on the basis of the iteration decay component, the current iteration state (140); determining whether an iteration termination condition is met (150), if the iteration termination condition is not met, then returning to control each of the lower-level computers for the projection matrix and the current iteration state to compute the iteration decay component and return the same until the preset iteration termination condition is met; and if the iteration termination condition is met, then using the current iteration state after iteration terminates as a CT three-dimensional reproduction result (160).
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