The chaotic behaviours in the p-Ge photoconductor system are studied by changing the photo-excitation coefficient and the routes and parameter conditions are given for chaos generation in this system. A scheme for con...The chaotic behaviours in the p-Ge photoconductor system are studied by changing the photo-excitation coefficient and the routes and parameter conditions are given for chaos generation in this system. A scheme for controlling chaos in the p-Ge photoconductor is presented by adding an ac bias current. Numerical simulations show that this scheme can be effectively used to control chaotic states into stable period states for this system. Moreover, the different period states with diifferent period numbers can be obtained by appropriately adjusting the amplitude, frequency, and initial phase of the additional ac current.展开更多
We present a scheme for the anti-control of chaos in the p-Ge photoconductor system by using a chaotic laser to irradiate and disturb this system. The numerical simulations show that this scheme can be effectively use...We present a scheme for the anti-control of chaos in the p-Ge photoconductor system by using a chaotic laser to irradiate and disturb this system. The numerical simulations show that this scheme can be effectively used to control periodic states in this t^Ge system into chaotic states. Moreover, the different chaos states with different chaotic orbits can be obtained by appropriately adjusting the disturbance intensity and disturbance frequency, and by increasing this intensity or reducing this frequency, this p-Ge system gradually evolves to fully developed chaotic states.展开更多
石英的微量元素记录了石英生长的物理化学条件。通过微量元素对石英原岩进行分类的研究历史已久,经典工作是在以微量元素为坐标轴的图解上绘制各类型石英的分布范围,以区分石英类型。经典图解包括Rusk(2012)提出用于区分三种矿床类型石...石英的微量元素记录了石英生长的物理化学条件。通过微量元素对石英原岩进行分类的研究历史已久,经典工作是在以微量元素为坐标轴的图解上绘制各类型石英的分布范围,以区分石英类型。经典图解包括Rusk(2012)提出用于区分三种矿床类型石英的Al-Ti二元图解,和Schr9n et al.(1988)提出的用于判别不同岩浆岩类型石英的Ti-Al-Ge三元图解。越来越多的研究表明,上述图解不能满足对更多石英类型进行分类的需求,同时也出现与部分已知产状类型的石英微量元素判别相矛盾的情况。随着石英原位微区测试方法的成熟,高精度石英微量元素数据逐渐丰富为系统开展机器学习提供了大数据基础,为石英微量元素研究提供了新的角度和可能性。本研究运用机器学习分类方法对石英微量元素进行精确数学分析,提出Ti/Ge-P图解为石英成因研究提出新的地球化学指标。本文同时测试了六种经典机器学习分类算法,提高Ti/Ge-P图解在石英成因分类研究上的精度。此Ti/Ge-P图解适用于多种矿床研究,包括但不局限于斑岩型矿床、矽卡岩型矿床、浅成低温热液型矿床、卡林型矿床以及造山型矿床中的石英。这项工作是大数据技术与机器学习技术在地球化学研究中的积极探索。展开更多
【目的】探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【方法】收集CYP1A2 163A/C基因多态性与肺癌易感性文献6篇,累计肺癌病例1033例,对照1626例,应用Meta分析探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【结果】CYP...【目的】探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【方法】收集CYP1A2 163A/C基因多态性与肺癌易感性文献6篇,累计肺癌病例1033例,对照1626例,应用Meta分析探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【结果】CYP1A2*1F基因多态性中CCVSAA的OR值为1.04,95%可信区间为0.54~2.02;ACVSAA的OR值为0.85,95%可信区间为,0.61~1.20;CC+ACVSAA的OR值为0.88,95%可信区间为0.60~1.27;CC vs AA+AC的OR值为0.83;95%可信区间为0.54~1.28。【结论】CYP1A2*1F基因多态性不增加肺癌的患病风险。展开更多
【目的】通过分析鉴定浙江省宁海县发生的一种严重危害枇杷生产的新病害的病原,为有效防治该病害提供理论依据。【方法】对宁海枇杷产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了...【目的】通过分析鉴定浙江省宁海县发生的一种严重危害枇杷生产的新病害的病原,为有效防治该病害提供理论依据。【方法】对宁海枇杷产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了该致病菌的致病性,同时根据形态学特征和ITS序列分析对病原菌进行鉴定,并利用BLAST软件将测序所得真菌ITS序列与NCBI(National Center for Biotechnology Information)数据库中已登录的序列进行同源序列比对。【结果】病原菌在病枝上分离频率为75.6%,对3 a生盆栽‘宁海白’枇杷树的叶片和枝条具有强致病力;在PSA上菌落呈白色绒毛状,生长旺盛,具轮纹,背面蜜黄色。25℃培养7 d后产生黑色小团状子实体。分生孢子5细胞,梭形或纺锤形,直或略弯曲;中间3色胞异色,第1、2色胞深褐色,第3色胞浅褐色,分隔处缢缩;顶孢无色,三角形,具2~3根附属丝,大角度分开;尾孢无色,三角形或圆锥形,具中生式柄1根,尾孢细胞大于顶孢细胞。该菌在枇杷病枝上分生孢子盘散生或聚集着生于寄主表皮下,成熟后突破寄主表皮,直径150~300μm。其ITS序列与已公布的聚多拟盘多毛孢菌的ITS序列的相似性可达到100%。【结论】宁海地区发生的新的枇杷病害是由半知菌亚门聚多拟盘多毛孢菌Pestalotiopsis sydowiana(Bres.)P.L.Zhu,Q.X.Ge&T.Xu,侵染引起。展开更多
基金Project supported by Scientific and Technological Development Plan Program of Jilin Province,China (Grant No.20090309)
文摘The chaotic behaviours in the p-Ge photoconductor system are studied by changing the photo-excitation coefficient and the routes and parameter conditions are given for chaos generation in this system. A scheme for controlling chaos in the p-Ge photoconductor is presented by adding an ac bias current. Numerical simulations show that this scheme can be effectively used to control chaotic states into stable period states for this system. Moreover, the different period states with diifferent period numbers can be obtained by appropriately adjusting the amplitude, frequency, and initial phase of the additional ac current.
文摘We present a scheme for the anti-control of chaos in the p-Ge photoconductor system by using a chaotic laser to irradiate and disturb this system. The numerical simulations show that this scheme can be effectively used to control periodic states in this t^Ge system into chaotic states. Moreover, the different chaos states with different chaotic orbits can be obtained by appropriately adjusting the disturbance intensity and disturbance frequency, and by increasing this intensity or reducing this frequency, this p-Ge system gradually evolves to fully developed chaotic states.
文摘石英的微量元素记录了石英生长的物理化学条件。通过微量元素对石英原岩进行分类的研究历史已久,经典工作是在以微量元素为坐标轴的图解上绘制各类型石英的分布范围,以区分石英类型。经典图解包括Rusk(2012)提出用于区分三种矿床类型石英的Al-Ti二元图解,和Schr9n et al.(1988)提出的用于判别不同岩浆岩类型石英的Ti-Al-Ge三元图解。越来越多的研究表明,上述图解不能满足对更多石英类型进行分类的需求,同时也出现与部分已知产状类型的石英微量元素判别相矛盾的情况。随着石英原位微区测试方法的成熟,高精度石英微量元素数据逐渐丰富为系统开展机器学习提供了大数据基础,为石英微量元素研究提供了新的角度和可能性。本研究运用机器学习分类方法对石英微量元素进行精确数学分析,提出Ti/Ge-P图解为石英成因研究提出新的地球化学指标。本文同时测试了六种经典机器学习分类算法,提高Ti/Ge-P图解在石英成因分类研究上的精度。此Ti/Ge-P图解适用于多种矿床研究,包括但不局限于斑岩型矿床、矽卡岩型矿床、浅成低温热液型矿床、卡林型矿床以及造山型矿床中的石英。这项工作是大数据技术与机器学习技术在地球化学研究中的积极探索。
文摘【目的】探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【方法】收集CYP1A2 163A/C基因多态性与肺癌易感性文献6篇,累计肺癌病例1033例,对照1626例,应用Meta分析探讨CYP1A2*1F基因多态性与肺癌易感性之间的关系。【结果】CYP1A2*1F基因多态性中CCVSAA的OR值为1.04,95%可信区间为0.54~2.02;ACVSAA的OR值为0.85,95%可信区间为,0.61~1.20;CC+ACVSAA的OR值为0.88,95%可信区间为0.60~1.27;CC vs AA+AC的OR值为0.83;95%可信区间为0.54~1.28。【结论】CYP1A2*1F基因多态性不增加肺癌的患病风险。
文摘【目的】通过分析鉴定浙江省宁海县发生的一种严重危害枇杷生产的新病害的病原,为有效防治该病害提供理论依据。【方法】对宁海枇杷产区的病害流行情况进行跟踪调查,从典型的枝干病灶组织中分离到了该病的致病菌,应用柯赫氏法则验证了该致病菌的致病性,同时根据形态学特征和ITS序列分析对病原菌进行鉴定,并利用BLAST软件将测序所得真菌ITS序列与NCBI(National Center for Biotechnology Information)数据库中已登录的序列进行同源序列比对。【结果】病原菌在病枝上分离频率为75.6%,对3 a生盆栽‘宁海白’枇杷树的叶片和枝条具有强致病力;在PSA上菌落呈白色绒毛状,生长旺盛,具轮纹,背面蜜黄色。25℃培养7 d后产生黑色小团状子实体。分生孢子5细胞,梭形或纺锤形,直或略弯曲;中间3色胞异色,第1、2色胞深褐色,第3色胞浅褐色,分隔处缢缩;顶孢无色,三角形,具2~3根附属丝,大角度分开;尾孢无色,三角形或圆锥形,具中生式柄1根,尾孢细胞大于顶孢细胞。该菌在枇杷病枝上分生孢子盘散生或聚集着生于寄主表皮下,成熟后突破寄主表皮,直径150~300μm。其ITS序列与已公布的聚多拟盘多毛孢菌的ITS序列的相似性可达到100%。【结论】宁海地区发生的新的枇杷病害是由半知菌亚门聚多拟盘多毛孢菌Pestalotiopsis sydowiana(Bres.)P.L.Zhu,Q.X.Ge&T.Xu,侵染引起。