Multiple-State Storage Capability of Stacked Chalcogenide Films （Si16Sb33Te51/Si4Sb45Te51/Si11Sb39Te50） for Phase Change Memory

The multiple-state storage capability of phase change memory （PCM） is confirmed by using stacked chalcogenide films as the storage medium. The current-voltage characteristics and the resistance-current characteristics of the PCM clearly indicate that four states can be stored in this stacked film structure. Qualitative analysis indicates that the multiple-state storage capability of this stacked film structure is due to successive crystallizations in different Si-Sb-Te layers triggered by different amplitude currents.     

PROFILE MINIMIZATION PROBLEM FOR MATRICES AND GRAPHS

ＰＲＯＦＩＬＥＭＩＮＩＭＩＺＡＴＩＯＮＰＲＯＢＬＥＭＦＯＲＭＡＴＲＩＣＥＳＡＮＤＧＲＡＰＨＳＬＩＮＹＩＸＵＮ（林詒勋）；ＹＵＡＮＪＩＮＪＩＡＮＧ（原晋江）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｈｅｍａｔｉｃｓ，ＺｈｅｎｇｚｈｏｕＵｎｉｖｅｒｓｉｔｙ，Ｚｈｅ...     

BBO晶体拉曼光谱的高温特性研究

ＢＢＯ晶体拉曼光谱的高温特性研究李郁陈凯旋尤静林蒋国昌（上海大学上海２０１８００）洪慧聪路治平仲维卓（中科院上海硅酸盐研究所上海２０００５０）ＨｉｇｈＴｅｍｐｅｒａｔｕｒｅＲａｍａｎＳｔｕｄｙｏｆＢＢＯＣｒｙｓｔａｌＬｉＹｕ，ＣｈｅｎＫａｉｘｕａｎ...     

低通量慢中子对Bi系超导体的辐照效应

本文研究低通量慢中子对Bi系超导体的辐照效应。实验结果表明:(1)Bi系超导体在适量慢中子辐照后,临界电流密度J_c和零电阻温度T_c0都有不同程度提高;(2)低通量慢中子和高通量快中子对Bi系超导体具有相似的辐照效应。 关键词：     

含稀土锰系氧化物的磁性和氧吸附性

比磁化率(x)和顺磁共振谱数据测定表明,含9种不同稀土的复合锰系氧化物Ln_(0.7)Sr_(0.3)MnO_3(Ln=Ce、Pr、Nd、Sm、Gd、Tb、Dy、Ho和Er)均为顺磁性物质,而La_(0.7)Sr_(0.3)MNO_3具有铁磁性。在200℃,80mT外磁场下,上述样品的氧吸附量(M)均有不同程度的提高。将比磁化率(x)~(2/3)与比表面(As)的乘积对氧吸附量变化值(ΔM)作图,得到以f电子数=7为分界的两分组线性图,并对此进行了讨论。     

对加速器驱动洁净核能系统散裂靶问题的探讨

简述了加速器驱动洁净核能靶系统的研究现状和存在的问题，对进一步可开展的工作提出了建议． The present status of the study on the neutron production rate, the neutron energy spectrum and the radiative nuclear production from the target spallation in accelerator driven clean nuclear system is presented. The Monto Carlo simulation and the related physics are also discussed. Their further improvement and the suggestions for the work to be done in China are proposed.     

Effect of Pulse Temporal Profile on Autler-Townes Splitting in Photoelectron Spectrum

The effect of pulse temporal profiles on the Autler-Townes （AT） splitting in photoelectron spectra is theoretically studied by employing the time-dependent wave packet method for a rotational Na2 molecule. The AT splitting which results from the sufficient Rabi oscillations is affected by the pulse profile and molecular alignment. The AT splitting may be observed only by utilizing proper pulse profiles with a certain intensity.     

积分型Chebyshev不等式妙用

Chebyshev不等式的积分形式,对于证明在区间上连续单调的抽象函数的积分不等式有着重要的应用.     

Smale横截同宿定理的推广与Lozi映射的混沌现象

该文首先将平面上的λ入引理及Ｓｍａｌｅ横截同宿定理推广到映射力局部不可微的情形，进而讨论了Ｌｏｚｉ映射的混沌现象，得到了一组保证该映射产生混沌的充分条件，详见图５．     

一类二维映射产生混沌的充分条件及应用

本文研究二维映射T(x,y)=(2x 呻(x)-y,x),存在横截2环、从而产生棍沌的充分条件。为应用,证明了A≤-40πsin(π/(2n 1))/(2n 1)(1 cos(π/(2n 1)))或A≥4/(n 1),n为奇数时Taylor映射产生混沌。从而在n为奇数时推广了[2-4]的结论。