At present, there are some static code analyses and optimizations that can be applied to Concurrent C programs to improve their performance or verify their logical correctness. These analyses and optimizations are int...At present, there are some static code analyses and optimizations that can be applied to Concurrent C programs to improve their performance or verify their logical correctness. These analyses and optimizations are inter-process. In order to make their implementation easy, we propose a new method to construct an optimizing compiling system CCOC for Concurrent C. CCOC supports inter-process code analysis and optimization to Concurrent C programs and does not affect the system's portability and separate compilation of source programs. We also discuss some implementation details of CCOC briefly.展开更多
The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Fur...The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.展开更多
采用0.13μm工艺,设计并实现了一款单端CR型分级的10 bit SAR-ADC。在设计中,CR型分级的采用显著降低了芯片面积,高5位的温度计码控制有效消除时钟溃通等误差,自举开关的设计提高了采样精度,前置放大器的高精度静态比较器有效降低失调...采用0.13μm工艺,设计并实现了一款单端CR型分级的10 bit SAR-ADC。在设计中,CR型分级的采用显著降低了芯片面积,高5位的温度计码控制有效消除时钟溃通等误差,自举开关的设计提高了采样精度,前置放大器的高精度静态比较器有效降低失调、提升了转换精度。设计的ADC内核尺寸为580μm×290μm,后仿真结果显示,在采样率1 MS/s下,输入正弦信号200 kHz时,ENOB可达9.5位,EO=1 LSB。展开更多
The oxygen reduction reaction(ORR)is a fundamental electrochemical process that occurs in various energy conversion and storage devices,including fuel cells and metal-air batteries[1].ORR can be classified as 2-electr...The oxygen reduction reaction(ORR)is a fundamental electrochemical process that occurs in various energy conversion and storage devices,including fuel cells and metal-air batteries[1].ORR can be classified as 2-electron(yielding H_(2)O_(2) or HO_(2)−)or 4-electron(yielding H_(2)O or OH−depending on the pH),with 4-electron ORR being more important for energy-storage and conversion.The ORR proceeds through a series of complex multistep reactions involving several oxygen intermediate species and multiple electron transfer processes.The complexity of the 4-electon ORR arises from the necessity to consider spin selection rules:the ground state of molecular oxygen is a triplet state(3 Rg−,with two unpaired electrons in p*orbitals with parallel spins),while the reaction products(e.g.,H_(2)O or OH−)all exist in a singlet state without unpaired electrons.This process,which involves a change in the spin state through spin-electron evolution,is spin-forbidden by traditional quantum mechanics,making it inherently slow and requiring the input of extra energy to drive a spin flip.展开更多
文摘At present, there are some static code analyses and optimizations that can be applied to Concurrent C programs to improve their performance or verify their logical correctness. These analyses and optimizations are inter-process. In order to make their implementation easy, we propose a new method to construct an optimizing compiling system CCOC for Concurrent C. CCOC supports inter-process code analysis and optimization to Concurrent C programs and does not affect the system's portability and separate compilation of source programs. We also discuss some implementation details of CCOC briefly.
基金the High Technology Research and Development Programme of China
文摘The design and realization of a videoconference system based on international recommendation are introduced in this paper, and the hardware implementation of video codec based on ITU-T H. 261 is briefly discussed. Furthermore, the buffer control method and the adaptive control strategy for quantization are proposed, which are adaptive and robust. This system can be operated under the transmission rate ranging from 128kb/s to 2Mb/s. With these strategies for the videoconference system, the high quality image is obtained. The time delay of the system is about half a second.
基金supported by the National Natural Science Foundation of China(22209186 and 22479149)the Selfdeployed Projects of Ganjiang Innovation Academy,Chinese Academy of Sciences(E355F006)+3 种基金the Natural Science Foundation of Jiangxi Province(310306484080)the Key Research and Development Program of Jiangxi Province(20223BBG74004 and 20232BBG70003)the Youth Innovation Promotion Association,Chinese Academy of Sciences(2023343)funding support from the Mac Diarmid Institute for Advanced Materials and Nanotechnology。
文摘The oxygen reduction reaction(ORR)is a fundamental electrochemical process that occurs in various energy conversion and storage devices,including fuel cells and metal-air batteries[1].ORR can be classified as 2-electron(yielding H_(2)O_(2) or HO_(2)−)or 4-electron(yielding H_(2)O or OH−depending on the pH),with 4-electron ORR being more important for energy-storage and conversion.The ORR proceeds through a series of complex multistep reactions involving several oxygen intermediate species and multiple electron transfer processes.The complexity of the 4-electon ORR arises from the necessity to consider spin selection rules:the ground state of molecular oxygen is a triplet state(3 Rg−,with two unpaired electrons in p*orbitals with parallel spins),while the reaction products(e.g.,H_(2)O or OH−)all exist in a singlet state without unpaired electrons.This process,which involves a change in the spin state through spin-electron evolution,is spin-forbidden by traditional quantum mechanics,making it inherently slow and requiring the input of extra energy to drive a spin flip.
