【摘 要】
：
Major, trace and organic elements of a laterite profile developed on Neogene basalt on Hainan Island, South China were reported to investigate elements mobilization and redistribution in tropical regi
【出 处】
：
Chinese Journal of Geochemistry
论文部分内容阅读
Major, trace and organic elements of a laterite profile developed on Neogene basalt on Hainan Island, South China were reported to investigate elements mobilization and redistribution in tropical regions. The results indicate that strong acid environme
其他文献
为了克服RFID系统的标签识别中存在的安全性问题和识别死循环问题,提出了一种群标签的识别与认证协议GIA.GIA协议在识别过程中采用假名进行防冲突识别,防止标签敏感信息的泄露,在认证过程中只用伪随机数发生器实现了阅读器和标签之间的相互认证,解决了中间人攻击、前向安全、重放攻击和克隆等安全问题,同时也满足了低成本标签的要求.用可证明安全模型证明了GIA满足了安全性目标.与现有的相关研究进行比较,GI
随着移动手持设备的普及,发行移动优惠券日益成为商家进行商业推广的一种重要举措。基于熟人口碑营销理念,首次提出一个离线可分享移动优惠券方案。采用近场通信(near field communication,NFC)技术和基于身份的公钥体制,方案能安全存储和传递优惠券。引入基于身份的代理授权机制实现安全创建并传递分享链,激励移动用户离线分享优惠券。结果分析表明,该方案具有正确性、不可伪造性、可验证性等安
针对使用无线射频识别技术(RFID)进行认证时存在的安全问题,提出了一种结合Hash函数与时间戳技术的认证协议。将标签的标识和时间戳数据通过Hash函数进行加密传输并进行认证。通过BAN逻辑证明和建立协议的Petri网模型仿真实验证明了该协议具有良好的前向安全性,能有效防止重放、位置跟踪、非法访问等攻击。
对普通PCA(principal component analysis)算法进行了改进,使之能用来检测点云模型中存在的平面反射对称性。算法的执行过程如下:首先,使用每个点元的面积作为权重,执行一次加权PCA确定一个近似的对称平面作为初始平面;然后,采用迭代的方法逐步调整上述的对称平面,使之趋向于真正的对称平面(主对称平面)。在每次迭代过程中,算法根据一个距离度量来更新每个点元的权重,通过新的权重执
[Objective]This study aimed to investigate the effects of 1-naphthol on primary productivity in aquatic ecosystems.[Method]The effects of 1-naphthol on biomass,chlorophyll a content,malondialdehyde( M
以天津市南开区水上公园和西青区农学院的4种湿地植物千屈菜、荷花、蒲草、芦苇为试材,对其叶片中过氧化物酶活性(POD)、超氧化物歧化酶(SOD)活性进行测定分析,探究其生理特性。结果表明:芦苇和蒲草的生理特性优于千屈菜和荷花,其中以荷花的最弱。在水上公园生长的植物其生理特性普遍好于天津农学院东校。
Un-tuned large volume airgun array in a water reservoir is recently proposed as a new way to generate seismic waves on land. It can be used to explore the earth velocity structure and its temporal var
It is well known that quantitative estimation of slip distributions on fault plane is one of the most important issues for earthquake source inversion related to the fault rupture process. The charact
Accurate simulation of seismic wave propagation in complex geological structures is of particular interest nowadays. However conventional methods may fail to simulate realistic wavefields in environme
A shear-wave velocity model of the crust and uppermost mantle beneath the SE Tibetan plateau was derived by inverting Rayleigh-wave group-velocity measurements of periods between 10 and 70 s. Rayleigh