The Walsh Transform of a Class of Boolean Functions

The Walsh transform is an important tool to investigate cryptographic properties of Boolean functions.This paper is de-voted to study the Walsh transform of a c...     

概化峡谷地形风场特性风洞试验

为研究峡谷地形的风场特性,首先对比了4类规范对峡谷地形风压或风速修正的规定;其次,以某V形对称坡度概化峡谷地形为研究对象,通过风洞试验,研究了其横断面方向和沿峡谷走向地形风速分布规律,并讨论了风向角对于峡谷地形风速分布的影响。结果表明：国外规范对峡谷地形风速修正规定较少,国内规范规定的峡谷风速修正系数在1.07~1.22之间;0°风向角下,风速地形修正系数沿峡谷中轴线基本对称;在测试高度范围内,沿峡谷走向加速区逐渐缩小,减速区逐渐变大,风速地形修正系数极大值逐渐减小,其极值均出现在“H1ZX”横断面,数值分别为1.34 5和0.45 6;0°和15°风向角下,沿峡谷走向,风速地形修正系数分别呈“旋涡状”和“山丘状”,减速区位置也不相同;谷底位置处的风速加速效应很有限,仅在峡谷风速入口位置附近存在加速效应,且风速修正系数值最大值小于规范规定最大值1.22。     

遗传算法和遗传规划对比研究

通过对遗传算法定向搜索机制和遗传规划搜索机制的研究比较,可以看出,依据遗传算法的基本思想设计遗传规划的进化算子时,由于算子空间过大而导致盲目搜索。通过对遗传规划的研究,提出了一套有定向机制的进化算子,进而设计和实现了基于这一套算子的遗传规划算法。     

一种新型神经网络控制器的研究

提出了一种新型神经网络控制器,其控制机理与PID控制相类似,但解决了常规PID控制存在的快速性与超调量的矛盾.给出了该神经网络控制器的自适应学习算法,分析讨论了控制系统的稳定性.仿真实验表明,这种新型神经网络控制器构成的自适应控制系统具有较强的适应性和鲁棒性.     

Optimal pricing and inventory policy with order cancelations under the cash-on-delivery payment scheme

Considering a periodic review system where the online seller allows the customers to pay when the products are delivered to them（referred as cash-on-delivery payment scheme in this paper）,the authors investigate the seller＇s joint pricing and inventory control policy with a finite planning horizon.In particular,the authors incorporate the customers＇ possible order cancellation behavior with the cash-on-delivery scheme.It can be proven that the base-stock list price policy is optimal under mild conditions.The authors also analyze the impact of the customers＇ forward looking behavior on the optimal policy.     

瞬变电磁法在一四井煤矿采空区探测中的应用

采用瞬变电磁法(TEM)在河南省新密市境内探查一四井煤矿采空区积水分布情况、断层等构造的含导水性情况及二1煤底板的富水性情况,为矿井防治水工作的合理实施提供依据.     

Development and Prospect of China Uranium Mining and Metallurgy

The development of industry of uranium mining and metallurgy in China has been reviewed generally, emphasizing on investigation approaches and application levels of uranium mining technologies such as insitu leaching, heap leaching, stope leaching: on the basis of analysis on status of uranium mining and metallurgy and problems existed, also considering the specific features of deposit resources, the development orientation of uranium mining and metallurgy in China is pointed out. The industry of China uranium mining and metallurgy is faced to new opportunity of development and challenge in 21st century, the only way to realize sustainable development of uranium mining and metallurgy and harmonious development between economy and environment is to develop new technology on mining, ore beneficiation and metallurgy, increase the utilization level of uranium resources, low down impact on environment caused by mining and metallurgy.     

喷锚网支护技术在基坑工程中的应用

文章介绍了非预应力喷锚网联合支护技术,在郑州信息大厦深基坑支护结构中的设计计算方法、施工技术措施及监测结果.     

甘肃第一性生产潜力的地区分布及开发利用初探

本文用迈阿密模型和桑斯韦特模型估算甘肃自然植被的第一性生产力及地区分布，用瓦赫宁根方法估算甘肃主要在作物的最大产量及地区分布。在此基础上，提出了分区开发初级生产潜力的途径。     

表面活性剂用作磁粉分散剂的研究

从实验及原理上说明了卵磷脂是优良的磁粉分散剂。提出了实验上确定卵磷脂最佳用量的方法。