We investigated experimentally the transmission performance of 100 Gbps dual-carrierdP-BPSK signals transmitted on a 3,080 km in-line chromatic dispersion compensated fiber link with real-time digital signal processi...
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We investigated experimentally the transmission performance of 100 Gbps dual-carrierdP-BPSK signals transmitted on a 3,080 km in-line chromatic dispersion compensated fiber link with real-time digital signal processing. Its doubled phase margin and nonlinear noise squeezing achieved 2 dB greaterrobustness to fiber nonlinearity effects compared to single-carrierdP-QPSK signal.
Ultracapacitors, also known as supercapacitors, have the potential to meet the increasing powerrequirements of energy-storage systems for automotive applications. As compared to batteries, ultracapacitors offer a hig...
Ultracapacitors, also known as supercapacitors, have the potential to meet the increasing powerrequirements of energy-storage systems for automotive applications. As compared to batteries, ultracapacitors offer a higher powerdensity, higher efficiency, and longer shelf and cycle life. Because the performance of an ultracapacitordepends on temperature, it is important to calculate accurately the thermal behavior of a single ultracapacitor cell and the module composed of multiple ultracapacitor cells for the efficient andreliable systems integration of an ultracapacitor in automotive applications. In this work, modeling is performed to study the thermal behavior of an ultracapacitor module. The ultracapacitor module is subject to the charge/discharge cycling with constant-current between 1.35V and 2.7V. The validation of the modeling approach is provided through the comparison of the modeling results with the experimental measurements. Fig. 1 shows the schematic diagram of the ultracapacitor module composed of the 18 ultracapacitor cells (3.7V/3000F) from LS Mtron Ltd. In Fig. 2, the variation of surface temperature with time from the experiment is compared with that from modeling during the charge-discharge cycles with the constant current of 200 A. Figure 1
Copper-based catalysts have shown excellent catalytic *** extensive studies in the field, the microscopic mechanism of ethanol dehydrogenation to ethyl acetate (EA) on Cu-based catalysts remains *** to provide insight...
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Copper-based catalysts have shown excellent catalytic *** extensive studies in the field, the microscopic mechanism of ethanol dehydrogenation to ethyl acetate (EA) on Cu-based catalysts remains *** to provide insight into the catalytic roles of Cu, density functional theory (dFT) calculations have been performed to study the elementary reactions involved in ethanol dehydrogenation to EA on Cu *** this work, the adsorption properties of ethanol, ethoxy, acetaldehyde,acetyl and EA on the Cu (111) catalyst surface were *** on two pathways, many transition states involved are *** results show that the route proposed by Colley is more likely to happen.
In this study, a driving v model for electric vehicle and a controller model for controlling the motor were developed. The driving motor is of the interior permanent magnet synchronous motor (IPMSM) type based on the ...
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In this study, a driving v model for electric vehicle and a controller model for controlling the motor were developed. The driving motor is of the interior permanent magnet synchronous motor (IPMSM) type based on the d/q axis voltage equation and torque equation, and includes a coordinate conversion module to convert the inputted three-phase voltage to the d/q axis. The controller model is designed to generate d/q axis current corresponding to the torque command through a torque ma and current phase angle map, and a feedforward compensator was included in the current controller model to improve current response. Furthermore, because a voltage constraint occurs at 3,500 rpm, weak field control was performed to control up to the maximum speed. To verify the performance of the developed model, the maximum speed of 11,000 rPM and the maximum torque 350 Nm which were the target performance were confirmed through simulation.
Phosphor converted LEd is commonly used as the white light source in solid state luminaires. Among the packaging processes involved, phosphordeposition is a critical step, which controls the overall optical performan...
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Phosphor converted LEd is commonly used as the white light source in solid state luminaires. Among the packaging processes involved, phosphordeposition is a critical step, which controls the overall optical performance of LEds. There are several phosphordeposition methods, among which disperse dispensing and conformal coating methods are widely used. In these two methods, phosphor materials are applieddirectly on top of the LEd chip. The phosphor materials are heated up by the LEd chip during the operation. The behavior of phosphor materials highly depends on their temperature. The emission efficiency decreases as temperature increases. High phosphor temperature may also introduce reliability problems. The situation can be improved by adopting a remote phosphor method. Some high power LEds packages utilize silicone lens to increase the light extraction efficiency. It is difficult to apply a remote phosphor layer on the convex surface using a regulardispensing process. In this paper, an innovative multilayerremote phosphordeposition method is proposed for the packages with silicone lens. Phosphor slurry was dispenseddirectly on the silicone lens with steps. The slurry flowed and spread on the dome, and stopped when it reached the edge of the step. The unique step feature stopped the phosphor slurry from overflowing. A package with multilayerremote phosphor layer was fabricated. The phosphor material in each layer was different. This method provides a simple and flexible platform for adopting different types of phosphor materials in one package, and hence to achieve the designed optical performance.
Carbon dioxide for enhanced oil recovery (CO 2 EOr) can magnify oil production substantially while a consistent amount of the CO 2 injectedremains sequestrated in the reservoir, which is beneficial forreducing the g...
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Carbon dioxide for enhanced oil recovery (CO 2 EOr) can magnify oil production substantially while a consistent amount of the CO 2 injectedremains sequestrated in the reservoir, which is beneficial forreducing the greenhouse gas (GHG) emission. The success of CO 2 EOr sequestration depends on the proper sources-sinks integration. This paper presents a systematic approach to pairing the CO 2 captured from industrial activities with oil reservoirs in South Sumatra basin for pilot project. Inventories of CO 2 sources and oil reservoirs were done through survey anddata questionnaires. The process of sources-sinks matching was preceded by scoring andranking of sources and sinks using criteria specifically developed for CO 2 EOr and sequestration. The top candidate of CO 2 sources are matched to several best sinks that correspond to added value, timing, injectivity, containment, and proximity. Two possible scenarios emerge for the initial pilot where the CO 2 will be supplied from the gas gathering station (GGS) while the H3 and F21 oil fields as the sinks. The pilot is intended to facilitate further commercial deployment of CO 2 EOr sequestration in the South Sumatera basin that was confirmed has abundant EOr and storage sinks as well as industrial CO 2 sources.
By combining two experiments, we evaluated to what extent short-term evaluation of discomfort glare is a good prediction for long-term exposure to the same lighting condition. The results indicated that glare reported...
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By combining two experiments, we evaluated to what extent short-term evaluation of discomfort glare is a good prediction for long-term exposure to the same lighting condition. The results indicated that glare reported after long time exposure was equal or slightly lower than what was assessed after short-term exposure, reducing the need for longer-term experiments.
Slow wave coplanar strips are fundamental elements in millimeter wave application. Based on four port scattering parameters, an equivalent lumped model is presentedrecovering the frequency independent parameters up t...
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Slow wave coplanar strips are fundamental elements in millimeter wave application. Based on four port scattering parameters, an equivalent lumped model is presentedrecovering the frequency independent parameters up to 110 GHz. The model parameters are generated based on two independent modes that propagate in two uniformly coupled propagating systems. All the coupling effects are considered. And no further fitting or optimization is required. The extracted SPICE-compatible model is validated by 65nm CMOS technology slow wave coplanar strips. We compare four port S-parameters. A very close agreement is obtained. The model is useful for various design applications.
Setting and adjusting each component operating status of the conventional chiller plant is usually based on human judgment or control of Proportional-Integral-differential(PId) based on pressure, temperature variables...
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Setting and adjusting each component operating status of the conventional chiller plant is usually based on human judgment or control of Proportional-Integral-differential(PId) based on pressure, temperature variables. due to the lack of scientific, systematic and optimum logic basis, it is difficult to optimize the operation of chiller plant and control the excessive energy consumption with these methods. This study employs the branch and bound(B&B) method to determine the optimum operation of each component within the plant to obtain the most energy-saving operation for maximum operation efficiency of the chiller plant, according to the actual required cooling capacity at load side, actual performance and operation condition of each component. The results reflect that the B&B method can obtain the optimum solution and increase the coefficient of performance(COP) of the original chiller plant by 10.63%.
Generally, the main components of autonomous driving system consists of perception (geometry recognition, localization, and objects detection & tracking) and navigation processes (global & local path planning,...
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ISBN:
(纸本)9781479960798
Generally, the main components of autonomous driving system consists of perception (geometry recognition, localization, and objects detection & tracking) and navigation processes (global & local path planning, and controller). In this paper, we focus on finding an accurate position for Unmanned Ground Vehicle (UGV) in urban environments. A GPS sensor is fundamentally used to get a current global position, but its accuracy is susceptible to satellite geometry orreceiver's conditions; even though high performance guaranteed GPS such as differential-GPS (dGPS) always return precise position(position error is less than 0.4m) because of problems such as disconnection between base station and vehicle. The position-errors, even few meters, could engender serious accidents when UGV is driving under urban environments. In this paper, we suggest the localization algorithm and novel lane detection algorithm. The detected lane information is implemented to overcome GPS sensor's position-errors. First, our novel lane detection algorithm is described, and then the localization algorithm is discussed. This paper also provides experimental results of the lane-detection and the localization in urban environment by using UGV.
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