We have analyzed the observations of SGR 1806-20 and SGR 1900+14 during giant flares made with the Rossi X-ray Timing Explorer.We have studied the pulsating tail after the initial spike and decomposed the pulse wavefo...We have analyzed the observations of SGR 1806-20 and SGR 1900+14 during giant flares made with the Rossi X-ray Timing Explorer.We have studied the pulsating tail after the initial spike and decomposed the pulse waveform into separate components of sub-pulses.We found evidence for phase shifts of those sub-pulses.This is probably due to rapid geometrical changes in the magnetic field of the neutron star during giant flares.The phase shifts could be used to constrain the geometry of the magnetic field.展开更多
A set of measurements have been conducted, using gamma spectrometry technique, in order to determine the activity-level in some carbonated soft drinks. The obtained activity is about 0.18 ± 0.07 Bq/l for <sup&...A set of measurements have been conducted, using gamma spectrometry technique, in order to determine the activity-level in some carbonated soft drinks. The obtained activity is about 0.18 ± 0.07 Bq/l for <sup>137</sup>Cs, whereas it is less than 0.13, 0.18 and 4.51 Bq/l respectively for <sup>212</sup>Pb, <sup>214</sup>Pb and <sup>40</sup>K. The total average annual dose is about 3.49, 1.69 and 1.68 μSv/y respectively for 7 - 12, 12 - 17 and >17 years old person leading to a radiological risk about 0.142 for adolescent and adults. The obtained results show no significant radiation dose and radiation hazard on human health due to the consumption of these carbonated soft drinks.展开更多
采用滚筒洗衣机对10种不同规格的棉织物进行10次重复洗涤,依据AATCC TM 202—2014 Relative hand value of textiles:instrumental method,通过PhabrOmeter织物手感评价系统测试每次洗涤后织物的手感数据,分析洗涤次数对织物手感的影响...采用滚筒洗衣机对10种不同规格的棉织物进行10次重复洗涤,依据AATCC TM 202—2014 Relative hand value of textiles:instrumental method,通过PhabrOmeter织物手感评价系统测试每次洗涤后织物的手感数据,分析洗涤次数对织物手感的影响。结果表明:洗涤次数对硬挺度和光滑度影响不明显,随着洗涤次数的增加,织物的硬挺度和光滑度在一定区间内呈现小幅波动;随着洗涤次数的增加,纱线线密度≥14.5 tex的织物相对手感值呈现先增大后趋于稳定的变化趋势,而纱线线密度<14.5 tex的织物相对手感值呈现先增后减再趋于稳定的变化趋势;随着洗涤次数的增加,柔软度呈现先增大后趋于稳定的规律。展开更多
航天器上器件硬件资源和能量受限,对在测控系统中实现变速率解调所需的硬件资源提出了更高的要求。本文提出伪高倍速率解调和重复译码算法,在不降低采样率的情况下可实现不同符号率信号的解调。理论推导证明该方法可达到理想的解调误码...航天器上器件硬件资源和能量受限,对在测控系统中实现变速率解调所需的硬件资源提出了更高的要求。本文提出伪高倍速率解调和重复译码算法,在不降低采样率的情况下可实现不同符号率信号的解调。理论推导证明该方法可达到理想的解调误码性能,且耗费的硬件资源不到经典的DDC(Direct Digital Converter)芯片硬件资源的一半。计算机仿真和实际测试表明该方法能有效应用于微波统一测控系统的变速率解调。展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 10773023 and 10833002)the One Hundred Talents Project of the Chinese Academy of Sciences,the Shanghai Pujiang Program (Grant No. 08PJ14111)+1 种基金the National Basic Research Program of China (Grant No. 2009CB824800)the Starting Funds at the Shanghai Astro-nomical Observatory
文摘We have analyzed the observations of SGR 1806-20 and SGR 1900+14 during giant flares made with the Rossi X-ray Timing Explorer.We have studied the pulsating tail after the initial spike and decomposed the pulse waveform into separate components of sub-pulses.We found evidence for phase shifts of those sub-pulses.This is probably due to rapid geometrical changes in the magnetic field of the neutron star during giant flares.The phase shifts could be used to constrain the geometry of the magnetic field.
文摘A set of measurements have been conducted, using gamma spectrometry technique, in order to determine the activity-level in some carbonated soft drinks. The obtained activity is about 0.18 ± 0.07 Bq/l for <sup>137</sup>Cs, whereas it is less than 0.13, 0.18 and 4.51 Bq/l respectively for <sup>212</sup>Pb, <sup>214</sup>Pb and <sup>40</sup>K. The total average annual dose is about 3.49, 1.69 and 1.68 μSv/y respectively for 7 - 12, 12 - 17 and >17 years old person leading to a radiological risk about 0.142 for adolescent and adults. The obtained results show no significant radiation dose and radiation hazard on human health due to the consumption of these carbonated soft drinks.
文摘采用滚筒洗衣机对10种不同规格的棉织物进行10次重复洗涤,依据AATCC TM 202—2014 Relative hand value of textiles:instrumental method,通过PhabrOmeter织物手感评价系统测试每次洗涤后织物的手感数据,分析洗涤次数对织物手感的影响。结果表明:洗涤次数对硬挺度和光滑度影响不明显,随着洗涤次数的增加,织物的硬挺度和光滑度在一定区间内呈现小幅波动;随着洗涤次数的增加,纱线线密度≥14.5 tex的织物相对手感值呈现先增大后趋于稳定的变化趋势,而纱线线密度<14.5 tex的织物相对手感值呈现先增后减再趋于稳定的变化趋势;随着洗涤次数的增加,柔软度呈现先增大后趋于稳定的规律。
文摘航天器上器件硬件资源和能量受限,对在测控系统中实现变速率解调所需的硬件资源提出了更高的要求。本文提出伪高倍速率解调和重复译码算法,在不降低采样率的情况下可实现不同符号率信号的解调。理论推导证明该方法可达到理想的解调误码性能,且耗费的硬件资源不到经典的DDC(Direct Digital Converter)芯片硬件资源的一半。计算机仿真和实际测试表明该方法能有效应用于微波统一测控系统的变速率解调。
