Swap量子门的消相干特性

利用单电子量子点的自旋态,研究了Swap量子门的量子相干特性。得到了系统的超算子,并利用超算子得出了体系的密度矩阵元,在玻恩和马尔科夫近似下,分析了体系由于磁环境所引起的消相干特性。     

对卡诺图化简逻辑函数的探讨

本文介绍在卡诺图中用圈“0”的方法简化逻辑函数。结合实例证明,在某些情况下,这种方法比用圈“1”的方法更简捷,不但可以节省时间,而且还可节省门电路。     

庐山"三石梁"瀑布小考

李白的《庐山遥寄卢侍御虚舟》是一首描绘庐山的佳作,诗中的“银河倒挂三石梁”句被认为描写的是庐山“三叠泉”瀑布。笔者结合文献、古人诗文并与该诗的内容相对照,对其重新考辨,认为李白并没有见过三叠泉瀑布,他所描写的应当是庐山“石门洞”瀑布。     

A low-power Rijndael S-Box based on pass transmission gate and composite field arithmetic

Using composite field arithmetic in Galois field can result in the compact Rijndael S-Box. However, the power con- sumption of this solution is too large to be used in resource-limited embedded systems. A full-custom hardware implementation of composite field S-Box is proposed for these targeted domains in this paper. The minimization of power consumption is implemented by optimizing the architecture of the composite field S-Box and using the pass transmission gate (PTG) to realize the logic functions of S-Box. Power simulations were performed using the netlist extracted from the layout. HSPICE simulation results indicated that the proposed S-Box achieves low power consumption of about 130 μW at 10 MHz using 0.25 μm/2.5 V technology, while the consumptions of the positive polarity reed-muller (PPRM) based S-Box and composite field S-Box based on the conventional CMOS logic style are about 240 μW and 420 μW, respectively. The simulations also showed that the presented S-Box obtains better low-voltage operating property, which is clearly relevant for applications like sensor nodes, smart cards and radio frequency identification (RFID) tags.     

分“门”别类——谈中国古典建筑中门的类型

门是建筑中不可缺少的元素,历经几千年发展的中国建筑文化,将门熏陶地纹彩绚烂,折射着自己的博大精深。门是建筑物的脸面,又是独立的建筑。古人言“宅以门户为冠带”,道出了门的社会阶级性。独特的中国建筑文化,因“门”而益发独特。于是,就有了这一页色彩纷呈的篇章。     

禅门丛林“茶榜”考论

在佛教寺院丛林中经常定期或不定期地结合一些活动,举行有组织的茶会或茶宴(筵)。这些活动均有规范的仪式,在许多寺院丛林的清规中都有记载。同时,作为这类茶事活动的一项重要内容或不可缺少的礼仪,就是必须以"茶榜"、"茶状"等形式进行告示,并执礼延请某些特定的用茶对象。研究"茶榜"与"茶状"的相关礼仪规制及其文体形式和内容,有助于佛教史、禅文化史及茶文化史的研究。     

Data Privacy and Academic Libraries: Non-PII,PII, and Librarians’ Reflections (Part 2)

Abstract

Using personally identifiable information (PII) (patron data) to make informed decisions in academic libraries through learning analytics programs has increasingly become more commonplace. In this column, we discuss how libraries around the world have used PII to make informed decisions about hours (gate count), electronic resources (collection usage and authentication), and research assistance (virtual reference). In addition, we discuss the use of learning analytics in library environments including the benefits and concerns associated with its use. Finally, we discuss how we have used PII at our institution’s library and the data metrics we plan utilize at some point in the future.     

TTL与非门在电力系统中的应用

全面详细地介绍了TTL与非门的检验方法、转换为其它电路的方法,及在电力电路方面的应用。实验结果表明,由TTL与非门构成的电路具有结构简单、工作稳定、速度快等优点。     

浅谈天水民居的门文化

单体门在中国传统建筑中占有很重要的地位。它是建筑平面组织的中心环节,代表着平面组织的层次,引领整个建筑主题。天水民居单体门的形制可概括为屋宇式、柱廊式和墙垣门三种。以屋宇式宅门多见,而柱廊式门大量为二柱式垂花门,少量是四柱或六柱的宅门。垂花门是天水民居单体门的亮点,集中表现了宅院中最丰富亮丽的色彩与装饰。民居四合院的等级、建制,见微知著,观一眼门楼便可知晓,同样,天水民居单体门的建筑造型、装修和细部装饰亦表现出天水民居建筑的综合特征:封建礼制的等级地位、建筑文化的土木属性、建筑气质的不卑不亢、建筑装饰的不施重彩、木雕艺术的流畅大方。     

导向环注射模具设计

分析导向环注塑件的结构及工艺特点,介绍导向环注射模具的结构和工作过程.通过对两种浇口形式的比较,选择效果较好的内侧潜伏式浇口为该模具的最终设计方案,并详细介绍了设计思路,总结了双分型面注射模的设计要点.该模具的成功设计和使用表明,双分型面内侧潜伏式浇口注射模具适合于表面质量和尺寸精度要求较高、多型腔、大批量生产的较小零件的要求.