从偶联位点、偶联剂、载体蛋白和偶联步骤等分析出发,设计了微囊藻毒素-LR (Microcystin- LR ,MC- LR)完全抗原的制备方法.在半抗原分子第7位氨基酸分子上引进1个自由的氨基;再用戊二醛2步法将此中间产物(H2 N etMC- LR)分别与BSA和OVA...从偶联位点、偶联剂、载体蛋白和偶联步骤等分析出发,设计了微囊藻毒素-LR (Microcystin- LR ,MC- LR)完全抗原的制备方法.在半抗原分子第7位氨基酸分子上引进1个自由的氨基;再用戊二醛2步法将此中间产物(H2 N etMC- LR)分别与BSA和OVA偶联.中间产物和偶联产物分别经固相萃取和透析纯化后,经SDS凝胶电泳、紫外扫描及生物质谱技术鉴定,结果表明MC- LR与BSA的平均偶联比能达到5以上,满足了进一步免疫的要求.展开更多
以蓝田县作为研究区,选取高程、坡度、坡向、曲率、降雨量、距水系距离、地层岩性、距断层距离、距道路距离、归一化植被指数(normalized difference vegetation index,NDVI)共10类评价因子,分别采用皮尔森相关系数、方差膨胀因子、容忍...以蓝田县作为研究区,选取高程、坡度、坡向、曲率、降雨量、距水系距离、地层岩性、距断层距离、距道路距离、归一化植被指数(normalized difference vegetation index,NDVI)共10类评价因子,分别采用皮尔森相关系数、方差膨胀因子、容忍度3种指标对评价因子之间的多重共线性问题进行分析。结果表明,各选取因子之间多重共线性较低,可以认为各因子相对独立。随后,采用频率比法分析各评价因子与滑坡灾害点之间的空间分布关系。分别利用熵指数(index of entropy,IOE)模型、逻辑回归(logistic regression,LR)模型以及两种模型耦合作用下的逻辑回归与熵指数耦合(integration of logistic regression and index of entropy,IOE-LR)模型对研究区滑坡易发性进行评价,得到各模型下的研究区滑坡灾害易发性区划图。最终采用接受者操作特性(receiver operating characterstic,ROC)曲线验证并比较了3种模型的性能。成功率曲线表明,IOE模型、LR模型、IOE-LR模型的ROC曲线下的面积(area under curve,AUC)分别为0.735、0.742和0.805;预测率曲线表明,IOE模型、LR模型、IOE-LR模型的ROC曲线下的面积AUC分别为0.732、0.785和0.830,其中IOE-LR模型均具有最高的准确率。生成的滑坡易发性区划图可以为蓝田县政府合理解决土地利用规划问题以及减轻滑坡风险提供有效参考。展开更多
In this letter, we present a modified vector-perturbation precoding scheme for the multiple-input multiple-output broadcast channel, where a perturbation vector is chosen to take into account both the instantaneous po...In this letter, we present a modified vector-perturbation precoding scheme for the multiple-input multiple-output broadcast channel, where a perturbation vector is chosen to take into account both the instantaneous power and the instantaneous peak power of the transmitted signal. This perturbation vector is obtained by using the closest point search, with the aid of the lattice-reduction algorithm. Simulation results show that the proposed scheme yields a tradeoff among power efficiency, peak-to-average power ratio reduction, and complexity.展开更多
文摘从偶联位点、偶联剂、载体蛋白和偶联步骤等分析出发,设计了微囊藻毒素-LR (Microcystin- LR ,MC- LR)完全抗原的制备方法.在半抗原分子第7位氨基酸分子上引进1个自由的氨基;再用戊二醛2步法将此中间产物(H2 N etMC- LR)分别与BSA和OVA偶联.中间产物和偶联产物分别经固相萃取和透析纯化后,经SDS凝胶电泳、紫外扫描及生物质谱技术鉴定,结果表明MC- LR与BSA的平均偶联比能达到5以上,满足了进一步免疫的要求.
文摘以蓝田县作为研究区,选取高程、坡度、坡向、曲率、降雨量、距水系距离、地层岩性、距断层距离、距道路距离、归一化植被指数(normalized difference vegetation index,NDVI)共10类评价因子,分别采用皮尔森相关系数、方差膨胀因子、容忍度3种指标对评价因子之间的多重共线性问题进行分析。结果表明,各选取因子之间多重共线性较低,可以认为各因子相对独立。随后,采用频率比法分析各评价因子与滑坡灾害点之间的空间分布关系。分别利用熵指数(index of entropy,IOE)模型、逻辑回归(logistic regression,LR)模型以及两种模型耦合作用下的逻辑回归与熵指数耦合(integration of logistic regression and index of entropy,IOE-LR)模型对研究区滑坡易发性进行评价,得到各模型下的研究区滑坡灾害易发性区划图。最终采用接受者操作特性(receiver operating characterstic,ROC)曲线验证并比较了3种模型的性能。成功率曲线表明,IOE模型、LR模型、IOE-LR模型的ROC曲线下的面积(area under curve,AUC)分别为0.735、0.742和0.805;预测率曲线表明,IOE模型、LR模型、IOE-LR模型的ROC曲线下的面积AUC分别为0.732、0.785和0.830,其中IOE-LR模型均具有最高的准确率。生成的滑坡易发性区划图可以为蓝田县政府合理解决土地利用规划问题以及减轻滑坡风险提供有效参考。
基金the National Natural Science Foundation of China (Nos. 60502046 and U0635003)the National Hi-Tech Research and Development Program (863) of China (No. 2006AA01Z267)
文摘In this letter, we present a modified vector-perturbation precoding scheme for the multiple-input multiple-output broadcast channel, where a perturbation vector is chosen to take into account both the instantaneous power and the instantaneous peak power of the transmitted signal. This perturbation vector is obtained by using the closest point search, with the aid of the lattice-reduction algorithm. Simulation results show that the proposed scheme yields a tradeoff among power efficiency, peak-to-average power ratio reduction, and complexity.
