Tianjin University

Dagang Oil Field Company of Cnpc

Semiconductor Manufacturing International (shanghai) Corporation

Semiconductor Manufacturing International (beijing) Corporation

Bcd Semiconductor Manufacturing Limited

Chinese Academy of Sciences

Diodes Inc.

Shanghai Sim-bcd Semiconductor Manufacturing Co., Ltd.

Bcd Semiconductor Manufacturing Co., Ltd.

Hu Wang

Mingfa Yao

Wei Jun Zhang

Yajiang Zhu

Xiugang Pu

Xianzheng Zhao

Haifeng Liu

Yang Wang

Zunqing Zheng

Wenzhong Han

Zhannan Shi

Xiongying Dong

Chao Gao

Lihong Zhou

Shan Shan Wang

Ruixia Fei

Shuzhuang Lv

Fengming Jin

Wenya Jiang

Wei Hu Zhang

Lixia Wei

Feng Qiu

Bin Wang

Qinghua Su

Jianda Shao

Pingan Zhao

Huizhen Zhu

Hongji Qi

Duanyang Chen

Can Wang

Jiapeng Wu

Shan Mi

Qun Luo

Mingchao Liu

Jingjing Zhao

Guorui Jia

Xiaoyi Xie

Yawei Tang

A semiconductor device includes a substrate; a gate structure, located over the substrate, the gate structure including a first gate oxide layer, a second gate oxide layer, and a silicon layer. The first gate oxide layer is over the substrate, and the first gate oxide layer has a sloped sidewall on one side and a vertical sidewall on another side. The second gate oxide layer is over the substrate and on the sloped sidewall of the first gate oxide layer, and a thickness of the second gate oxide layer is less than a thickness of the first gate oxide layer. The silicon layer is formed over the first gate oxide layer and the second gate oxide layer.

Semiconductor device

A shale brittleness sweet spot evaluation method is provided, comprising: determining a brittleness evaluation formula of shale brittleness indexes, shale mineral volume percent content and shale total organic matter mass percent content according to a shale volume-mass conversion formula and a brittleness calculation formula containing shale total organic matter volume percent content and the shale mineral volume percent content; drawing a shale brittleness grading chart of a research area target interval according to the brittleness evaluation formula and measured shale mineral volume percent content values and shale total organic matter mass percent content values of multiple shale samples of the research area target interval; and evaluating shale brittleness sweet spots of the research area target interval. By adopting the method, the shale brittleness sweet spots can be accurately and quantitatively recognized, shale exploration and development cost is reduced, and production capacities of gas-bearing shale formation are increased.

Shale brittleness sweet spot evaluation method

Embodiments of the present invention provide an oil-gas reservoir exploration method and apparatus and belong to the technical field of oil-gas exploration. The method includes: acquiring hydrocarbon source rock distribution, reservoir distribution, fault distribution and oil-gas reservoir distribution; determining at least one oil-gas accumulation chain according to the hydrocarbon source rock distribution, the reservoir distribution, the fault distribution and the oil-gas reservoir distribution; and determining exploration targets and an exploration order of oil-gas reservoirs according to the at least one oil-gas accumulation chain and the oil-gas reservoirs on the oil-gas accumulation chain. By using the oil-gas reservoir exploration method and apparatus, the exploration targets and the exploration order may be precisely and rapidly determined.

Oil-gas reservoir exploration method and apparatus

A method for forming a semiconductor device includes providing a substrate, forming an oxide layer over the substrate, forming a plurality of first gate oxide layers by etching the oxide layer, forming a second gate oxide layer between adjacent first gate oxide layers, forming a silicon layer over the plurality of first gate oxide layers and the second gate oxide layer, and etching the plurality of first gate oxide layers, the silicon layer, and the second gate oxide layer to expose the substrate, thereby forming a plurality of gate structures. The first gate oxide layer of the plurality of first gate oxide layers has sloped sidewalls. A thickness of the second gate oxide layer is less than a thickness of the first gate oxide layer. Each gate structure includes an etched first oxide layer, a portion of the second gate oxide layer, and a portion of the silicon layer.

Semiconductor device and method for forming the same

The present invention discloses a control method of variable stroke engine for reforming high-octane fuel under the FCE mode, the ECU connected to the engine controls the amount of fuel injected from the flexible cylinder injector to the flexible cylinder and controls the switch state of inlet valve and exhaust valve of the flexible cylinder, so that the flexible cylinder can be switched between two-stroke mode and four-stroke mode according to the actual engine operating conditions; when the engine is at a small load and needs to promote combustion stability, the flexible cylinder injector injects a rich fuel with equivalence ratio greater than 1 into the flexible cylinder, the flexible cylinder is at two-stroke mode; when the engine is at a large load and needs sufficient power output, the flexible cylinder injector injects a conventional fuel into the flexible cylinder, said flexible cylinder is at four-stroke mode.

Control method of variable stroke engine for reforming high-octane fuel under the flexible cylinder engine (FCE) mode

The present disclosure discloses an intake oxygen concentration control system suitable for an engine with lean NOtrapping technology. The system adopts an exhaust turbocharging device to provide a pressure difference for an oxygen-enriched membrane to generate oxygen-rich and oxygen-deficient gases, and controls the intake oxygen concentration of different cylinders by adjusting the opening of flow control valves to match lean and rich combustion cycles of a lean NOtrapping system. In a lean combustion cycle, all four cylinders are filled with an oxygen-rich gas, which can make the combustion more complete and improve the thermal efficiency and fuel economy. In a rich combustion cycle, one of the four cylinders is filled with an oxygen-deficient gas, and the other three cylinders are filled with air or an oxygen-rich gas with a low concentration, so that less fuel is required to create a reducing atmosphere to realize the release and reduction of NOin a lean NOtrapping device, thereby reducing the fuel consumption and ensuring the output power of the other three cylinders.

Intake oxygen concentration control system suitable for engine with lean NOx trapping technology

The present disclosure provide a method and device for optimal selection of fracturing stage clusters of continental shale oil horizontal well. The method includes: acquiring data information of a horizontal well to be fractured and data information of a key cored well; constructing a fracturing cluster evaluation index for the horizontal well according to the data information of the horizontal well to be fractured and the data information of the key cored well; and determining distribution of fracturing clusters and perforated interval clusters using the fracturing cluster evaluation index in conjunction with a principle of differential construction of horizontal well clusters. With the method and the device provided by the embodiment of the present disclosure, the problems of waste of resources and poor effect of oil production by fracturing, caused by uniform or overly dense distribution of clusters are solved.

Method and apparatus for optimal selection of fracturing stage clusters of continental shale oil horizontal well

A battery charger controller is configured to add a compensation current in the feedback control loop such that the output voltage varies with the output current to compensate charging cable voltage drop. In some embodiments, the output voltage is also proportional to a compensation resistor. Therefore, cable voltage drop compensation can be adjusted using a resistor that is external to the controller IC. The external resistor may be one of the feedback resistors connected at a voltage feedback pin. In another embodiment, the adjustable resistor is the resistor between the feedback resistors and the voltage feedback pin. In still another embodiment, the adjustable resistor is the resistor in parallel with a compensation capacitor. In embodiments of the invention, adjusting the resistance of the external compensation resistor can change the voltage drop compensation and allow the power supply to meet requirements of different charging cable applications.

Adjustable cable voltage compensation for battery chargers

The present invention discloses a novel engine controlled by combustion reaction path, which cylinders comprise working cylinders and reforming cylinders. According to the operational condition of engine, the engine is used for compressing, heating and reforming the fuel injected from the reforming cylinder injector; by controlling the reaction boundary conditions between fuel and air, the reforming cylinder can exhaust partial intermediate products or oxidation products of the different oxidation stages; the products are then mixes with the inlet air in the pre-mixing chamber and then is introduced into the working cylinder. Under operating in different working conditions, the engine can discharge the mixed gas with different activities under different oxidation stages by regulating the corresponding boundary conditions of the reforming reaction of the reforming cylinder, and can achieve concentration stratification and activity stratification of the mixed gas in the working cylinder by using the fuel injected from the working cylinder injectors, and can effectively achieve high effectiveness and broaden the scope of clean combustion by changing the combustion reaction path. The present invention just adopts simple oxidation reaction post-treatment device, and then the emission of the engine can meet the requirement of EuroVI emission regulation.

Engine controlled by combustion reaction path and regulating method thereof

Method for limiting growth of KDP-type crystals with a long seed where an upper and a lower ends of the long seed crystal are respectively limited by an upper baffle plate and a lower tray to restrain growth of a pyramidal surface and allow only four prismatic surfaces in [100] and [010] directions to grow. Finally grown crystal contains no pyramid-prism interface that severely restricts quality of optical element, and all cut optical elements have high optical quality. As four prismatic surfaces are subjected to highly similar growing environment and grow simultaneously, all optical elements cut therefrom have high optical uniformity. Due to uniqueness of a cutting angle of a KDP crystal frequency-tripled element, high cutting efficiency is achieved in the element, and an area of a maximum frequency-tripled element that may be cut is known in advance according to a horizontal size of the grown crystal.

Method for limiting growth of KDP-type crystals with a long seed

The present invention discloses a novel low-temperature fuel reforming unit based on combined external reformer of an engine, comprising an engine cylinder and an external low-temperature fuel reformer; the external low-temperature fuel reformer is winded with a heater strip and is provided with a first temperature controlled meter, the inlet of the external low-temperature fuel reformer is connected with a air inlet pipe and a fuel sample injection pipe, and a flow meter is arranged on the air inlet pipe; the fuel sample injection pipe is connected with a fuel injection pump and a fuel vaporization tank which is provided with a second temperature controlled meter; the outlet of the external low-temperature fuel reformer is connected with the engine inlet pipe via a reforming gas pipe; and the reformed low-temperature products enter into the engine inlet pipe via the reforming gas pipe for combining with the fresh air again to form a uniform hybrid gas, and the hybrid gas is introduced into the engine cylinder and performing combined combustion with the fuel in the cylinder to achieve activity and concentration stratification of hybrid gas. Since the above process does not need adding catalyst, the engine of the present invention can be operated more efficient and energy-saving.

Low-temperature fuel reforming unit based on combined external reformer of an engine

A switch mode power supply (SMPS) has a primary-side controller configured to control a power switch for turning on and turning off a current flow in the primary winding. A secondary-side controller is coupled to the secondary winding for providing constant voltage (CV) and constant current (CC) control of the SMPS. The secondary-side controller is configured to receive an output selection signal and, based on the output selection signal, select a voltage reference signal from a plurality of voltage reference signals and select a current reference signal from a plurality of current reference signals. The secondary-side controller is configured to monitor an output voltage and an output current of the SMPS, and is configured to provide a turn-on signal to the primary-side controller for turning on the power switch upon determining that the output voltage is below the selected voltage reference signal and the output current is below the selected current reference signal.

Switching mode power supply with selectable constant-voltage constant-current control

A control circuit is provided for a buck converter that includes at least an inductor coupled to an output of the buck converter. The control circuit includes a power switch configured for coupling to a line voltage and configured for charging the inductor, an input line voltage sampling circuit, and a constant-voltage (CV) and constant-current (CC) control module coupled to the power switch. During a charging period of the inductor, the CV and CC control module is configured to control the power switch to provide a constant output current by maintaining a constant peak inductor current, even when the input line voltage changes. During a discharging period of the inductor, the CV and CC control module is configured to monitor the sensed output voltage to control the power switch to provide a constant output voltage.

Constant-voltage and constant-current buck converter and control circuit

A control circuit is configured for controlling a power switch to regulate an output of a power converter. The control circuit is configured to increase a switching frequency of the power switch when a first signal representing a magnitude of the power converter is below a first output level. In some embodiment, the first output level is selected such that when the first signal is below the first output level, the power converter may generate audible noise. In an embodiment, when the first signal is above the first output level, the control circuit is configured to turn off the power switch when a second signal representing a current in the power switch is above a first reference level. On the other hand, when the first signal is below the first output level, the control circuit is configured to turn off the power switch if the second signal reaches a lower reference level.

Control circuit and method for audible noise suppression in a power converter

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Tianjin, China

Hu Wang