BEHAVIOUR OF FLUORINE IN BLAST-FURNACE SMELTING Ⅱ.SMELTING PAO-TOU IRON ORE IN AN EXPERIMENTAL BLAST-FURNACE

为了研究包头铁矿的冶炼特性及由于矿石含氟所引起的一系列问题起见,我所于1955年11月筹建了有效容积约为1米~3的实验高炉一座及全部附属设备。1955年11月30日至12月8日及12月20日至12月24日进行了二次试炉。经过设备上的改进后,于1956年1月20日至2月11日及4月23日至5月29日进行了二次冶炼试验,获得设计上所要求的的主要数据后停炉。在实验高炉冶炼试验期间并进行了4次物质平衡的试验。结果发现绝大部分的氟进入炉渣中,进入炉尘中的氟石多,而高炉煤气中的氟极低.     

Singular perturbation analysis of high-frequency filter design

The control design of systems with lightly damped high frequency oscillatory modes is treated. Systems exhibiting these lightly damped modes include turbine generators and large flexible structures. Frequently the dynamics of these high-frequency modes are not known very accurately. As a result, the design objective is to improve the slow dynamics without destabilizing the high-frequency modes. From a classical frequency domain design viewpoint, this is in part a filtering problem requiring some kind of high-frequency filter. The singular perturbation method is used to systematically develop a two-time-scale method to design these high-frequency filters and provides guidelines on the kind of high-frequency filter to be used. In addition, the method provides an asymptotic error analysis. The design is illustrated with an example representative of a power system model with a two-mass turbine-generator model.     

印刷带状偶极子天线与经典三维柱状偶极子天线的等效理论研究

相对于传统的柱状偶极子,印制偶极子天线更适合应用于现代通讯系统.本文通过引入边缘场效应,对传统的基于感应电动势法的柱状电偶极子辐射阻抗公式进行修正,并在此基础上将其推广至印制偶极子天线中.此外,本文还采用合成渐进法,基于物理概念,推导出平面偶极子天线的谐振频率及谐振频率处辐射电阻的两个计算机辅助计算公式.数值计算及验证表明,两个公式的精度均在2%以内,可以用于指导工程设计.     

利用富氧技术提高硫回收装置的处理能力和效率

用氧气代替空气中的部分或全部氮气可大大降低克劳斯硫回收及尾气处理装置的气体流量。对于新建装置,富氧技术可减小设备尺寸从而减少投资;对于改造项目,富氧技术是一个高投资效益的扩能方案。除经济优点外,富氧技术还可改善硫回收及尾气处理装置的操作,提高污染物分解率、硫回收率、操作可靠性和稳健性。富氧浓度可根据装置布局、处理能力、...     

旧金山的可持续创意

可持续的创意城市需要一种可以使生活方式多样化的城市结构。文章着重介绍旧金山的演变与发展,并提出两条重要经验:城市的多样化可以并必须体现在城市环境的各个尺度上;建筑形态不能和城市的创意文化割裂开来——建筑创造了城市。     

A dynamic job-assignment policy

Job assignment is a well-known problem in manufacturing lines. Line management tries to maximize line productivity by assigning a given crew a set of predefined line jobs. However, problems may arise because of abnormal conditions such as absenteeism, workstation failure, parts shortage, or unevenly distributed work-in-process. This report considers a dynamic job-assignment policy making use of online information for assignment. This policy attempts to achieve a good skill match between jobs and operators, and to eliminate unnecessary assignments. To fulfill this policy, a two-part assignment program is proposed: an algorithm for job matching and a set of ad hoc rules. The matching algorithm is well established in literature, but the ad hoc rules are application-dependent. Discussion here concentrates on the ad hoc rules and online data collection.     

Automated microscopy system for mosaic acquisition and processing

An automatic mosaic acquisition and processing system for a multiphoton microscope is described for imaging large expanses of biological specimens at or near the resolution limit of light microscopy. In a mosaic, a larger image is created from a series of smaller images individually acquired systematically across a specimen. Mosaics allow wide‐field views of biological specimens to be acquired without sacrificing resolution, providing detailed views of biological specimens within context. The system is composed of a fast‐scanning, multiphoton, confocal microscope fitted with a motorized, high‐precision stage and custom‐developed software programs for automatic image acquisition, image normalization, image alignment and stitching. Our current capabilities allow us to acquire data sets comprised of thousands to tens of thousands of individual images per mosaic. The large number of individual images involved in creating a single mosaic necessitated software development to automate both the mosaic acquisition and processing steps. In this report, we describe the methods and challenges involved in the routine creation of very large scale mosaics from brain tissue labelled with multiple fluorescent probes.     

磷矿焙烧及其所含倍半氧化物在酸中溶解度的研究

<正>引言 磷矿是磷肥生产的主要原料,对于它的品位评价,不仅决定于其中所含磷酸盐的量,亦决定于其杂质矿物的含量。特别是,铁铝杂质的含量是评价磷矿品位重要条件之一。因为这些杂质矿物对磷肥生产十分有害。它非但使生产加工过程发生困难,而且使磷肥的质量降低,甚至不合标准。因此,在选择磷矿原料时,对其中所含铁铝杂质矿物的含量有严格的限制。例如,在过磷酸钙或萃取磷酸生产中,磷矿原料中铁的含量不能超过如下的规定:     

关于用ISO 9705评价材料的火焰传播

虽然性能化规范尚未达到通用的程度 ,但中国香港建筑业消防安全条款已用于“工程方法”设计中 ,在回顾了四个标准试验 ,即 ASTM E1 32 1 - 97a、BS4 76 :Part:1 997、ASTM E84 -99/ NFPA2 5 5和 ISO970 5 :1 993(E)之后 ,介绍了 ISO970 5 ,供地方政府评估各种材料的火焰传播。为妥善处理新的建筑材料 ,应将材料和构件的火焰传播试验列入说明中