The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sabl...The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sables(Martes zibellina), one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Employing published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale including four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads reduced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road closure and removal will reduce the fragmentation functionally and benefit the sable population.展开更多
This paper studies the habitat selection of sables (Martes. zibellina) in spring adopting radio-tracking and GPS (Global Positioning System) in Daxing’an Mountains of China. Sables liked mature and elder forest, but ...This paper studies the habitat selection of sables (Martes. zibellina) in spring adopting radio-tracking and GPS (Global Positioning System) in Daxing’an Mountains of China. Sables liked mature and elder forest, but it avoided uncovered and young growth land. In spring sables had strong selection to medium cover-degree forest, but it avoided widen ground and especial high cover-degree forest. On the contrary sables didn’t have the strong selection to shrubs cover-degree, but strong selection to dominant tree species, slope degree and slope direction, especially sable liked medium and lower slope. At the same time, sables had the strong selection to the log’s density and the crown’s cover-degree. Generally it avoided high elevation and lower slope land.展开更多
差分功耗分析(Differential Power Analysis,DPA)通过分析密码器件处理不同数据时的功耗差异来盗取密钥。运用具有功耗独立特性的灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)设计密码器件可以有效防御DPA攻击。通过对SABL电路与...差分功耗分析(Differential Power Analysis,DPA)通过分析密码器件处理不同数据时的功耗差异来盗取密钥。运用具有功耗独立特性的灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)设计密码器件可以有效防御DPA攻击。通过对SABL电路与传统加法器原理的研究,提出了一种能够抗DPA攻击的可重构加法器设计方案。首先,结合SABL电路特点得到具有抗DPA攻击性能的加法器电路;然后利用控制进位方式构成可重构加法器,支持4个8位数据或2个16位数据的加法运算。Spectre模拟验证表明,该加法器逻辑功能正确,与传统加法器相比功耗独立性能提升了97%,防御DPA攻击性能明显。展开更多
通过对传统移位寄存器原理和灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)电路的研究,提出一种能够防御差分功耗分析的移位寄存器设计方案。该方案首先采用主从触发的方式,设计基于SABL电路的清零置位D触发器;然后利用该触发器与S...通过对传统移位寄存器原理和灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)电路的研究,提出一种能够防御差分功耗分析的移位寄存器设计方案。该方案首先采用主从触发的方式,设计基于SABL电路的清零置位D触发器;然后利用该触发器与SABL逻辑门实现多位移位寄存器电路。Spectre仿真验证表明,所设计的移位寄存器逻辑功能正确,在多种PVT组合下NED均低于2.66%、NSD均低于0.63%,具有显著的防御差分功耗分析性能。展开更多
Objective: Tumor associated antigen encoding gene HCA520 (AF146019) was identified by screening a human hepatocellular carcinoma expressing cDNA library using SEREX technique. In this experiment we studied the effect ...Objective: Tumor associated antigen encoding gene HCA520 (AF146019) was identified by screening a human hepatocellular carcinoma expressing cDNA library using SEREX technique. In this experiment we studied the effect of HCA520 on cell proliferation and apoptosis. Methods: Gene HCA520 was gained by PCR and transfected into 293 cells. The stable expression cells were obtained by G418 selection. The cell proliferation was measured by [3H]-TdR uptake and apoptosis assay was measured by FACS. Results: Eukaryotic expression plasmid pcDNA3-HCA520 was constructed and its stable transfectants were obtained. Overexpression of HCA520 inhibited the cell proliferation and enhanced cell apoptosis after serum deprivation. Conclusion: HCA520 is a novel tumor associated antigen that can affect cell proliferation and apoptosis.展开更多
To objectively classify and evaluate the strong aroma base liquors(SABLs)of different grades,solid-phase microextraction-mass spectrometry(SPME-MS)combined with chemometrics were used.Results showed that SPME-MS combi...To objectively classify and evaluate the strong aroma base liquors(SABLs)of different grades,solid-phase microextraction-mass spectrometry(SPME-MS)combined with chemometrics were used.Results showed that SPME-MS combined with a back-propagation artificial neural network(BPANN)method yielded almost the same recognition performance compared to linear discriminant analysis(LDA)in distinguishing different grades of SABL,with 84%recognition rate for the test set.Partial least squares(PLS),successive projection algorithm partial least squares(SPA-PLS)model,and competitive adaptive reweighed samplingpartial least squares(CARS-PLS)were established for the prediction of the four esters in the SABL.CARS-PLS model showed a greater advantage in the quantitative analysis of ethyl acetate,ethyl butyrate,ethyl caproate,and ethyl lactate.These results corroborated the hypothesis that SPME-MS combined with chemometrics can effectively achieve an accurate determination of different grades of SABL and prediction performance of esters.展开更多
Let P be a pseudo-arc in 2-sphere S<sup>2</sup>. A homeomorphism h : P →→ P is called essentially extendable iff there exists an imbedding φ:P → S<sup>2</sup> such that the homeomorphism ...Let P be a pseudo-arc in 2-sphere S<sup>2</sup>. A homeomorphism h : P →→ P is called essentially extendable iff there exists an imbedding φ:P → S<sup>2</sup> such that the homeomorphism φ hφ<sup>-1</sup>: φ（P）→φ（P）can be extended to S<sup>2</sup>.展开更多
This letter introduces the accomplisnment of the synthesis of homoharringtonine (6), an antitumor alkaloid approved by elinical evaluation as an antileukemic drug. The stepwise reaction route is shown as follows.
基金Under the auspices of National Natural Science Foundation of China(No.41271201,31070422,41201185)
文摘The anthropogenic managements of forest have created a network of roads resulting in the loss and alternation of habitat. To better understand road′s impact on animal habitats, we assessed the habitat pattern of sables(Martes zibellina), one of rodents within national first-class protected species, when roads are considered in Huzhong area in Da Hinggan Mountains, northeastern China. Employing published literatures about behavior ecology, aerial photographs and forest stand maps, we classified the study area into three habitat types including best-suitable, suitable and unsuitable habitats based on sable habitat requirements at the landscape scale including four variables derived from forest source map with attribute database. Results indicated the loss and significant fragmentation of best-suitable habitat and home range habitat when roads, especially 150 m avoidance distance of roads, were considered. The roads reduced and fragmented highly suitable habitats more significantly during earlier development period than the later development period. Additionally, the suitable area percentage increased with increasing distance to roads. This study helped to identify the suitable area for sables and location of sable population. Also, this study suggested the passage construction and road management involving road closure and removal will reduce the fragmentation functionally and benefit the sable population.
文摘This paper studies the habitat selection of sables (Martes. zibellina) in spring adopting radio-tracking and GPS (Global Positioning System) in Daxing’an Mountains of China. Sables liked mature and elder forest, but it avoided uncovered and young growth land. In spring sables had strong selection to medium cover-degree forest, but it avoided widen ground and especial high cover-degree forest. On the contrary sables didn’t have the strong selection to shrubs cover-degree, but strong selection to dominant tree species, slope degree and slope direction, especially sable liked medium and lower slope. At the same time, sables had the strong selection to the log’s density and the crown’s cover-degree. Generally it avoided high elevation and lower slope land.
文摘差分功耗分析(Differential Power Analysis,DPA)通过分析密码器件处理不同数据时的功耗差异来盗取密钥。运用具有功耗独立特性的灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)设计密码器件可以有效防御DPA攻击。通过对SABL电路与传统加法器原理的研究,提出了一种能够抗DPA攻击的可重构加法器设计方案。首先,结合SABL电路特点得到具有抗DPA攻击性能的加法器电路;然后利用控制进位方式构成可重构加法器,支持4个8位数据或2个16位数据的加法运算。Spectre模拟验证表明,该加法器逻辑功能正确,与传统加法器相比功耗独立性能提升了97%,防御DPA攻击性能明显。
文摘通过对传统移位寄存器原理和灵敏放大型逻辑(Sense Amplifier Based Logic,SABL)电路的研究,提出一种能够防御差分功耗分析的移位寄存器设计方案。该方案首先采用主从触发的方式,设计基于SABL电路的清零置位D触发器;然后利用该触发器与SABL逻辑门实现多位移位寄存器电路。Spectre仿真验证表明,所设计的移位寄存器逻辑功能正确,在多种PVT组合下NED均低于2.66%、NSD均低于0.63%,具有显著的防御差分功耗分析性能。
文摘Objective: Tumor associated antigen encoding gene HCA520 (AF146019) was identified by screening a human hepatocellular carcinoma expressing cDNA library using SEREX technique. In this experiment we studied the effect of HCA520 on cell proliferation and apoptosis. Methods: Gene HCA520 was gained by PCR and transfected into 293 cells. The stable expression cells were obtained by G418 selection. The cell proliferation was measured by [3H]-TdR uptake and apoptosis assay was measured by FACS. Results: Eukaryotic expression plasmid pcDNA3-HCA520 was constructed and its stable transfectants were obtained. Overexpression of HCA520 inhibited the cell proliferation and enhanced cell apoptosis after serum deprivation. Conclusion: HCA520 is a novel tumor associated antigen that can affect cell proliferation and apoptosis.
基金The study was supported by the Key Research and Development Program of Jiangsu Province(BE2020312)National Natural Science Foundation of China(31671844)+2 种基金Open Project of National Engineering Laboratory for Agri-product Quality Traceability(AQT-2019-YB7)Science Foundation for Postdoctoral in Jiangsu Province(1501100C)Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD).
文摘To objectively classify and evaluate the strong aroma base liquors(SABLs)of different grades,solid-phase microextraction-mass spectrometry(SPME-MS)combined with chemometrics were used.Results showed that SPME-MS combined with a back-propagation artificial neural network(BPANN)method yielded almost the same recognition performance compared to linear discriminant analysis(LDA)in distinguishing different grades of SABL,with 84%recognition rate for the test set.Partial least squares(PLS),successive projection algorithm partial least squares(SPA-PLS)model,and competitive adaptive reweighed samplingpartial least squares(CARS-PLS)were established for the prediction of the four esters in the SABL.CARS-PLS model showed a greater advantage in the quantitative analysis of ethyl acetate,ethyl butyrate,ethyl caproate,and ethyl lactate.These results corroborated the hypothesis that SPME-MS combined with chemometrics can effectively achieve an accurate determination of different grades of SABL and prediction performance of esters.
基金Project supported by the National Natural Science Foundation of China
文摘Let P be a pseudo-arc in 2-sphere S<sup>2</sup>. A homeomorphism h : P →→ P is called essentially extendable iff there exists an imbedding φ:P → S<sup>2</sup> such that the homeomorphism φ hφ<sup>-1</sup>: φ（P）→φ（P）can be extended to S<sup>2</sup>.
文摘This letter introduces the accomplisnment of the synthesis of homoharringtonine (6), an antitumor alkaloid approved by elinical evaluation as an antileukemic drug. The stepwise reaction route is shown as follows.
