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Now showing items 1 - 16 of 356

  • Synthesis of N-alkylated chitosan and its interactions with blood

    Yuchen Huang   Yi Zhang   Longbao Feng   Liumin He   Rui Guo   Wei Xue  

    When hydrophobically modified chitosan (HM-CHI) comes into contact with red blood cells (RBCs), it can cause agglomeration. This property leads HM-CHI to be a potential agent to form a rapid haemostatic plug to stop bleeding at wound sites. In this study, we investigated the properties of the HM-CHI biopolymer to act as an agent that rapidly clots blood. We have examined the synthesis and structural characteristics of HM-CHI – blood substances using X-ray diffraction, infrared spectroscopy and elemental analysis. To understand the rheological behaviour of RBCs within HM-CHI, we have studied the effects of HM-CHI on RBC aggregation and morphology using a rheometer and scanning electron microscopy (SEM), respectively. When mixed with sodium citrate, HM-CHI rapidly transformed human blood into an elastic gel. In contrast, un-modified chitosan (i.e. without hydrophobes) was unable to clot blood. The hydrophobias within HM-CHI entered into the RBC membranes and connected to the cells by a sample-spanning network, which subsequently led to the formation of an elastic gel. The gelling ability of HM-CHI is similar to that of fibrin-based sealants, but at a much lower cost and greater availability.
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  • Resource negotiation method, device, and system for D2D communication

    A resource negotiation method, a device, and a system for D2D communication are provided. The method comprises: a second base station acquires an available channel resource of a first device, where the first device is connected with a first base station; the second base station allocates, on the basis of an available channel resource of a second device connected with self and of the available channel resource of the first device, a D2D communication resource for D2D communication between the first device and the second device; and the second base station notifies the second device of the allocated D2D communication resource and notifies the first device via the first base station. The resource negotiation method, the device, and the system for D2D communication implement resource negotiation for successful D2D communication between devices under different base stations or access points.
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  • Pluggable touch-safe fuse module with built-in removal handle

    A touch-safe fuse module includes a built-in slidable handle movable between extended and retracted positions relating to a housing of the fuse module. In the extended position, the handle assists with removal of the fuse from a base housing assembly by improving mechanical leverage to apply extraction force to the housing. Fuse modules having high current ratings may be effectively removed by hand without separately provided tools.
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  • Targeted gene suppression by inducingde novoDNA methylation in the gene promoter

    Ai-Niu Ma   Hong Wang   Rui Guo   Yong-Xiang Wang   Wei Li…  

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  • Display panel and driving method thereof, and display apparatus

    A display panel, a driving method for the same, and a display apparatus, wherein the display panel includes: a display substrate with a plurality of TFTs arranged in an array, a source driving integrated circuit and a gate driving integrated circuit, the gate driving IC is connected with a plurality of gate lines, each gate line is connected with the gates of the TFTs in adjacent N rows, and different gate lines are connected with the gates of the TFTs in different rows, N is an integer being greater than 1; the source driving IC is connected with a plurality of source lines, sources of different TFTs connected to a same gate line are connected with different source lines, and sources of the TFTs, which are connected to different gate lines and located in a same column and spaced g*N−1 TFTs apart, are connected with a same source line.
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  • Dynamic behaviors of the breather solutions for the AB system in fluid mechanics

    Rui Guo   Hui-Qin Hao   Ling-Ling Zhang  

    Under investigation in this paper is the AB system, which describes marginally unstable baroclinic wave packets in geophysical fluids. Through symbolic computation, Lax pair and conservation laws are derived and the Darboux transformation is constructed for this system. Furthermore, three types of breathers on the continuous wave (cw) background are generated via the obtained Darboux transformation. The following contents are mainly discussed by figures plotted: (1) Modulation instability processes of the Akhmediev breathers in the presence of small perturbations; (2) Propagations characteristics of Ma solitons; (3) Dynamic features of the breathers evolving periodically along the straight line with a certain angle of z-axis and t-axis.
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  • Imaging system design and image interpolation based on CMOS image sensor

    Yu-feng Li   Fei Liang   Rui Guo  

    An image acquisition system is introduced, which consists of a color CMOS image sensor (OV9620), SRAM (CY62148), CPLD (EPM7128AE) and DSP (TMS320VC5509A). The CPLD implements the logic and timing control to the system. SRAM stores the image data, and DSP controls the image acquisition system through the SCCB (Omni Vision Serial Camera Control Bus). The timing sequence of the CMOS image sensor OV9620 is analyzed. The imaging part and the high speed image data memory unit are designed. The hardware and software design of the image acquisition and processing system is given. CMOS digital cameras use color filter arrays to sample different spectral components, such as red, green, and blue. At the location of each pixel only one color sample is taken, and the other colors must be interpolated from neighboring samples. We use the edge-oriented adaptive interpolation algorithm for the edge pixels and bilinear interpolation algorithm for the non-edge pixels to improve the visual quality of the interpolated images. This method can get high processing speed, decrease the computational complexity, and effectively preserve the image edges.
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  • SmartGuard: An autonomous robotic system for inspecting substation equipment

    Binhai Wang   Rui Guo   Bingqiang Li   Lei Han   Yong Sun and Mingrui Wang  

    Substation equipment inspection is necessary for the power industry. With the dramatic increase in the number of substations, unmanned substations are required by the industry. This paper presents SmartGuard, a completely autonomous robotic system that can inspect substation equipment. SmartGuard consists of a robot and a data center. The robot can patrol in a substation and inspect equipment with a visible-light camera and an infrared thermograph. The acquired images and temperature information are analyzed by the data center. The data center can fuse infrared and visible-light images and find abnormal hot spots and abnormal appearance. There are 13 SmartGuards currently serving 12 substations, some of which have been working for more than 2 years. The feedback from the field shows that SmartGuard significantly improves the efficiency and reliability of substation inspection.
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  • A Theoretical and Experimental Study on Solubility of Curatives in Rubbers

    Rui Guo   Auke G. Talma   Rabin N. Datta   Wilma K. Dierkes   Jacques W. M. Noordermeer  

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  • Torsional vibration analysis of lathe spindle system with unbalanced workpiece

    Rui Guo   Sung-Hyun Jang   Young-Hyu Choi  

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  • The Determinants of U. S. Equity Index Funds Flows

    Rui Guo  

    Existing studies on fund flows focus on actively managed funds and S&P 500 index funds. This thesis examines the determinants of funds flow for a sample of 211 U.S. index funds representing eight different underlying indexes over a period of approximately 16 years. We find that performance in general has a positive effect on fund flows. Fund fees (including expense ratios and front-end loads) are negatively related with fund flows. The association between fund flows and tracking error depends upon time period with a positive relation over the most recent subperiod and a negative relation over the earlier subperiod. We find that institutional and retail investors have different funds-flow responses to performance, tracking errors and fund fees. While some determinants affect the sensitivity of flows to performance ranges, these influences are not robust since they do not persist for all types of performance measures.
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  • Solid-phase photocatalytic degradation of polystyrene with TiO2/Fe(St)3 as catalyst

    Wenjun Fa   Lili Guo   Jie Wang   Rui Guo   Zhi Zheng and Fengling Yang  

    A novel photodegradable TiO2-Fe(St)3-polystyrene (TiO2-Fe(St)3-PS) nanocomposite was prepared by embedding TiO2 and Fe(St)3 into the commercial polystyrene. Ferric stearate was added into polymer as cocatalyst in order to improve the dispersion in polystyrene and photocatalytic efficiency of TiO2 nanoparticles. Solid-phase photocatalytic degradation of the TiO2-Fe(St)3-PS nanocomposite was carried out in an ambient air at room temperature under ultraviolet lamp. The properties of TiO2-Fe(St)3-PS composite film were compared with that of the pure PS film and the TiO2-PS composite film, through weight loss monitoring, scanning electron microscope, gel permeation chromatogram, and FTIR spectroscopy. The photodegradation efficiency of TiO2-Fe(St)3-PS composite film was higher than that of the pure PS film and the TiO2-PS composite film under the UV light irradiation. The average molecular weight (Mw) of TiO2-Fe(St)3-PS composite film decreased 63.08%, and the number of average molecular weight (Mn) decreased 79.49% after UV light irradiation for 480 h. Photo-oxidation leads to an increase in the low molecular weight fraction by chain scission, thereby facilitating biodegradation.
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  • High current, compact fusible disconnect switch with dual slider bar actuator assembly

    A high current fusible disconnect switch device includes a switch housing configured to receive a pluggable touch-safe fuse module, and a dual slide bar actuator assembly for opening and closing switch contacts. The dual slide bar elements are each coupled to bias elements that store and release energy to affect switch opening and closing operations. The switch opening and closing operation is multi-staged wherein the only the first slider element is movable in the first stage, and both the first and second slider elements are movable in the second stage.
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  • Piezoelectric Properties of the 1–3 Type Porous Lead Zirconate Titanate Ceramics

    Rui Guo   Chang-An Wang   Ankun Yang  

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  • Evaluation of the fate of perfluoroalkyl compounds in wastewater treatment plants

    Rui Guo   Won-Jin Sim   Eung-Sun Lee   Ji-Hyun Lee   Jeong-Eun Oh  

    Recent studies have shown that the wastewater treatment plant (WWTP) is a significant source of perfluoroalkyl compounds (PFCs) in natural water. In this study, 10 PFCs were analyzed in influent and effluent wastewater and sludge samples in 15 municipal, 4 livestock and 3 industrial WWTPs in Korea. The observed distribution pattern of PFCs differed between the wastewater and sludge samples. Perfluorooctane sulfonate (PFOS) was dominant in the sludge samples with a concentration ranging from 3.3 to 54.1 ng/g, whereas perfluorooctanoic acid (PFOA) was dominant in wastewater and ranged from 2.3 to 615 ng/L and 3.4 to 591 ng/L in influent and effluent wastewater, respectively. Principal component analysis (PCA) results provided an explanation for this variation in PFC distribution patterns in the aqueous and sludge samples. The fates of PFCs in the WWTPs were related with the functional groups. The PFOS concentrations tended to decrease after treatment in most WWTPs, whereas PFOA increased. The different fates of PFOA and PFOS in WWTPs were attributed to the higher organic carbon-normalized distribution coefficient of perfluoroalkylsulfonate (PFASs) than that of the carboxylate analog, indicating the preference of PFASs to partition to sludge. Although industrial WWTPs contained high concentration of PFCs, they are not the main source of PFCs in Korean water environment because of their small release amount. WWTPs located in big cities discharged more PFCs, suggesting household sewage is one of the significant sources of PFCs contamination in the environment.
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  • Evaluation of the fate of perfluoroalkyl compounds in wastewater treatment plants

    Rui Guo   Won-Jin Sim   Eung-Sun Lee   Ji-Hyun Lee   Jeong-Eun Oh  

    Recent studies have shown that the wastewater treatment plant (WWTP) is a significant source of perfluoroalkyl compounds (PFCs) in natural water. In this study, 10 PFCs were analyzed in influent and effluent wastewater and sludge samples in 15 municipal, 4 livestock and 3 industrial WWTPs in Korea. The observed distribution pattern of PFCs differed between the wastewater and sludge samples. Perfluorooctane sulfonate (PFOS) was dominant in the sludge samples with a concentration ranging from 3.3 to 54.1 ng/g, whereas perfluorooctanoic acid (PFOA) was dominant in wastewater and ranged from 2.3 to 615 ng/L and 3.4 to 591 ng/L in influent and effluent wastewater, respectively. Principal component analysis (PCA) results provided an explanation for this variation in PFC distribution patterns in the aqueous and sludge samples. The fates of PFCs in the WWTPs were related with the functional groups. The PFOS concentrations tended to decrease after treatment in most WWTPs, whereas PFOA increased. The different fates of PFOA and PFOS in WWTPs were attributed to the higher organic carbon-normalized distribution coefficient of perfluoroalkylsulfonate (PFASs) than that of the carboxylate analog, indicating the preference of PFASs to partition to sludge. Although industrial WWTPs contained high concentration of PFCs, they are not the main source of PFCs in Korean water environment because of their small release amount. WWTPs located in big cities discharged more PFCs, suggesting household sewage is one of the significant sources of PFCs contamination in the environment.
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