排序方式: 共有38条查询结果,搜索用时 15 毫秒
1.
REE AND Sr, Nd, Pb ISOTOPIC GEOCHEMISTRY OF HUANGYISHAN BASALT, KUANDIAN, LIAONING, NORTHEAST CHINA 总被引:1,自引:0,他引:1
In the light of major element geochemistry, mineral chemistry and REE and isotopic data, the small but apparent isotopic differences between the Cenozoic volcanic rocks east and west of the Tancheng-Lujiang fault are believed to be caused by the mixing and metasomatism of crustal and mantle material in tho mantle source region in response to Pacific plate subduction. The presence of phlogopite and pargasite in mantle xenoliths lends strong support to mantle metasomatism. 相似文献
2.
3.
Fault tolerant deterministic secure quantum communication using logical Bell states against collective noise 下载免费PDF全文
This study proposes two novel fault tolerant deterministic secure quantum communication(DSQC) schemes resistant to collective noise using logical Bell states. Either DSQC scheme is constructed based on a new coding function, which is designed by exploiting the property of the corresponding logical Bell states immune to collective-dephasing noise and collective-rotation noise, respectively. The secret message can be encoded by two simple unitary operations and decoded by merely performing Bell measurements, which can make the proposed scheme more convenient in practical applications.Moreover, the strategy of one-step quanta transmission, together with the technique of decoy logical qubits checking not only reduces the influence of other noise existing in a quantum channel, but also guarantees the security of the communication between two legitimate users. The final analysis shows that the proposed schemes are feasible and robust against various well-known attacks over the collective noise channel. 相似文献
4.
在2-一致光滑的Banach空间中,引入一种新的迭代算法研究非膨胀映象的不动点集与α-逆强增生算子的变分不等式解集的公共元素,并获得了迭代算法的强收敛性定理.而且应用这些结果考虑了非膨胀映象和严格伪压缩映象公共不动点的收敛性问题. 相似文献
5.
A novel deterministic secure quantum communication(DSQC)scheme is presented based on EinsteinPodolsky-Rosen(EPR)pairs and single photons in this study.In this scheme,the secret message can be encoded directly on the first particles of the prepared Bell states by simple unitary operations and decoded by performing the Bell-basis measurement after the additional classic information is exchanged.In addition,the strategy with two-step transmission of quantum data blocks and the technique of decoy-particle checking both are exploited to guarantee the security of the communication.Compared with some previous DSQC schemes,this scheme not only has a higher resource capacity,intrinsic efciency and total efciency,but also is more realizable in practical applications.Security analysis shows that the proposed scheme is unconditionally secure against various attacks over an ideal quantum channel and still conditionally robust over a noisy and lossy quantum channel. 相似文献
6.
离子偶极相互作用是一种超分子相互作用,作用基元为带相反电荷的偶极和离子.离子偶极相互作用具有许多特性,如没有方向性和饱和性、自愈性以及动态性.该作用可以同时赋予高分子材料优异的电学性能和力学性能,进而赋予了含有该作用的高分子材料在柔性电子、储能等领域巨大的应用潜力,同时吸引了科学家对该类材料的探索与开发.本文主要总结了我们课题组在基于离子偶极相互作用的高分子材料方面的研究工作,从一系列不同的离子偶极基元出发,构筑具有不同力学以及电学性能的高分子材料,随后介绍了它们的应用.例如人造肌肉、人造皮肤、离子电致发光、触摸板等,可用于可穿戴设备以及人机交互界面. 相似文献
7.
8.
本文我们考虑了实Hilbert空间中强半压缩(SDC)算子的Ishikawa迭代的误差估计(不需要Lipschitz条件),同时得到了Ishikawa迭代的一些收敛性定理.此外,我们在三种情况下给出了SDC算子的数据依赖性结果.一些数值算例验证了我们的结果. 相似文献
9.
2010年中国成为世界第二大经济体,这意味着中国需要更多的橡胶资源以满足其经济的快速发展。橡胶材料可以通过两个来源得到,一个是源自巴西橡胶树的天然橡胶,一个是源自化石资源的合成橡胶。我国的天然橡胶资源非常短缺,而合成橡胶又不可持续发展。因此,利用太阳能发展生物橡胶是中国橡胶工业可持续发展的未来。生物橡胶包含两大类材料,一类是生物基工程弹性(Bio-based engineering elastomer,BEE),它将可再生的生物质资源发酵得到衣康酸等生物基单体,再经化学合成得到的一类新的弹性体,或者将生物质发酵得到的生物基单体如异丁醇等进一步转化为传统单体如异丁烯等,再经过化学合成得到传统的弹性体;第二类是天然橡胶,包括三叶橡胶和第二天然橡胶(Second natural rubber,SNR),例如蒲公英橡胶、银菊橡胶以及我国特有的杜仲橡胶。本文将对生物基工程弹性体和第二天然橡胶进行综述,由于三叶橡胶的研究历史悠久、文献众多,在此不再综述。 相似文献
10.