动态电压频率调整(Dynamic Voltage Frequency Scaling,DVFS)可以使系统在高电压工作时获得高性能,在低电压工作时降低系统功耗,它要求电路能够从正常电压一直到亚阈值区范围内均能正常工作.抗辐照DVFSSRAM的设计面临着低压工作稳定性...动态电压频率调整(Dynamic Voltage Frequency Scaling,DVFS)可以使系统在高电压工作时获得高性能,在低电压工作时降低系统功耗,它要求电路能够从正常电压一直到亚阈值区范围内均能正常工作.抗辐照DVFSSRAM的设计面临着低压工作稳定性及工艺、电压、温度偏差(Process,Voltage,Temperature,PVT)的严重影响.本文针对以上问题,设计了一款适应于DVFS应用的抗辐照静态随机存储器(Static Random Access Memory,SRAM).提出了新型抗辐照DICE单元结构,其读噪声容限相对于原有DICE单元有大幅提升.同时,针对常规分级位线结构时序控制电路存在的问题,提出了改进型复制列技术,增强了SRAM存储体在不同PVT环境下工作的稳定性.对SRAM存储体进行了电路设计及版图设计,后仿真结果表明,设计的512bit SRAM存储体可在0.6V^1.8V电源电压下正常工作.在1.8V下,SRAM的存取速度为5.1ns,功耗为1.8mW;在0.6V电压下,SRAM的存取速度为93.5ns,功耗为14.63μW,比1.8 V电源工作时的功耗降低了约100倍.另外,设计的SRAM对宽度为300ps以下的单粒子瞬态脉冲具有滤除能力,对单粒子翻转效应有良好的抵抗能力.展开更多
The bulk peanuts were used as the materials. After ）,-ray irradiation of different doses, the peanuts were stored up at room temperature, and the degree of pest infection and gradient of mould infection were observed...The bulk peanuts were used as the materials. After ）,-ray irradiation of different doses, the peanuts were stored up at room temperature, and the degree of pest infection and gradient of mould infection were observed regularly. The results showed that insects began to appear in the unirradiated peanuts in 2 months, while after 4 months, the pest infection rate increased with the prolonged storage time, and the pest infection rate reached up to 58%-100% after 6 months of storage. However, the irradiated peanuts did not suffer from the pest infection throughout the storage. The unirradiated peanuts were contaminated by moulds after three months of storage, while the peanuts with an irradiation dose of 0.3-0.5 kGy were mildewed after 6 months of storage, while those with an irradiation dose of 1.0, 4.0 kGy had no mould after 12 months of storage. Combined with relevant international and national standards as well as the findings of scholars at home and abroad, the minimum effective irradiation dose for insect disinfestations of peanuts was 0,3 kGy, and the minimum effective irradiation dose for mildew control was 1.0 kGy, while the maximum tolerance dose was 4.0 kGy.展开更多
In this paper, the origin and type of radiation hazards as well as the main aspects of radiation protection for low-energy accelerators are discussed in general, and the problems of radiation protection and the experi...In this paper, the origin and type of radiation hazards as well as the main aspects of radiation protection for low-energy accelerators are discussed in general, and the problems of radiation protection and the experimental results of the operational monitoring of the five accelerators in the institute of Nuclear Science and Technology,Sichuan University, namely, one 1.2 M cyclofron, two Cockroft-waltons and two Van de Graafts, as well as a powerful electron accelerator for industrial irradiation are described. The discussion and evaluation are made according to the requirments of the National standards GB 5172-85.展开更多
It is capable of giving the initial intakes of radionuclides and the assessment quantities used in radiation protection according to its measured results of radionuclides in vivo. It is accomplished by providing the ...It is capable of giving the initial intakes of radionuclides and the assessment quantities used in radiation protection according to its measured results of radionuclides in vivo. It is accomplished by providing the software of controlling, interface and internal dose estimation programs to the original iron cabin shielding whole-body counter. The preliminary application shows that its data processing is rapid and correct, and can meet the requirement of rapid internal radioactive contamination monitoring and diagnosing in case of lots of internal contamination subjects happened innuclear accident.展开更多
文摘动态电压频率调整(Dynamic Voltage Frequency Scaling,DVFS)可以使系统在高电压工作时获得高性能,在低电压工作时降低系统功耗,它要求电路能够从正常电压一直到亚阈值区范围内均能正常工作.抗辐照DVFSSRAM的设计面临着低压工作稳定性及工艺、电压、温度偏差(Process,Voltage,Temperature,PVT)的严重影响.本文针对以上问题,设计了一款适应于DVFS应用的抗辐照静态随机存储器(Static Random Access Memory,SRAM).提出了新型抗辐照DICE单元结构,其读噪声容限相对于原有DICE单元有大幅提升.同时,针对常规分级位线结构时序控制电路存在的问题,提出了改进型复制列技术,增强了SRAM存储体在不同PVT环境下工作的稳定性.对SRAM存储体进行了电路设计及版图设计,后仿真结果表明,设计的512bit SRAM存储体可在0.6V^1.8V电源电压下正常工作.在1.8V下,SRAM的存取速度为5.1ns,功耗为1.8mW;在0.6V电压下,SRAM的存取速度为93.5ns,功耗为14.63μW,比1.8 V电源工作时的功耗降低了约100倍.另外,设计的SRAM对宽度为300ps以下的单粒子瞬态脉冲具有滤除能力,对单粒子翻转效应有良好的抵抗能力.
基金Supported by the Special Fund for Agro-scientific Research in the Public Interest(201103007)~~
文摘The bulk peanuts were used as the materials. After ）,-ray irradiation of different doses, the peanuts were stored up at room temperature, and the degree of pest infection and gradient of mould infection were observed regularly. The results showed that insects began to appear in the unirradiated peanuts in 2 months, while after 4 months, the pest infection rate increased with the prolonged storage time, and the pest infection rate reached up to 58%-100% after 6 months of storage. However, the irradiated peanuts did not suffer from the pest infection throughout the storage. The unirradiated peanuts were contaminated by moulds after three months of storage, while the peanuts with an irradiation dose of 0.3-0.5 kGy were mildewed after 6 months of storage, while those with an irradiation dose of 1.0, 4.0 kGy had no mould after 12 months of storage. Combined with relevant international and national standards as well as the findings of scholars at home and abroad, the minimum effective irradiation dose for insect disinfestations of peanuts was 0,3 kGy, and the minimum effective irradiation dose for mildew control was 1.0 kGy, while the maximum tolerance dose was 4.0 kGy.
文摘In this paper, the origin and type of radiation hazards as well as the main aspects of radiation protection for low-energy accelerators are discussed in general, and the problems of radiation protection and the experimental results of the operational monitoring of the five accelerators in the institute of Nuclear Science and Technology,Sichuan University, namely, one 1.2 M cyclofron, two Cockroft-waltons and two Van de Graafts, as well as a powerful electron accelerator for industrial irradiation are described. The discussion and evaluation are made according to the requirments of the National standards GB 5172-85.
文摘It is capable of giving the initial intakes of radionuclides and the assessment quantities used in radiation protection according to its measured results of radionuclides in vivo. It is accomplished by providing the software of controlling, interface and internal dose estimation programs to the original iron cabin shielding whole-body counter. The preliminary application shows that its data processing is rapid and correct, and can meet the requirement of rapid internal radioactive contamination monitoring and diagnosing in case of lots of internal contamination subjects happened innuclear accident.
