The Organization of Production in High Technology Industries: An Empirical Assessment*     

Audrey E. Clarke  Brian P. Holly 《The Professional geographer》1996,48(2):127-139

Recent attention given to the concept of vertical integration and disintegration of production processes has identified the existence of a continuum, with small, flexibly specialized producers at one end and large, mass production units at the other end. Firms along the continuum constantly strive for the optimum combination of economies of scale and scope. This paper attempts to identify the organizational characteristics of high technology firms in one industrial complex of the U.S. Manufacturing Belt. A principal components analysis is performed on a number of theoretically relevant variables for a sample of high technology establishments in Northeast Ohio. The results indicate that the region contains a variety of organizational forms ranging from isolated workshops to large, vertically integrated assembly plants. These findings conform to expectations derived from recent conceptualizations in the literature. Additional empirical research will further enhance understanding of the processes that shape the organization of production in territorial complexes.  相似文献   

高围压下冻结砂土的强度特性   总被引：2，自引：6，他引：2  

马巍  吴紫汪 《冰川冻土》1996,18(3):268-272

在高围压条件下，对冻结兰州砂土在不同温度和不同应变速度下进行三轴压缩试验，试验结果表明，围压的增大和应变速度的减小明显增强了冻土的塑性性能；同时，随围压的增大，冻土的抗剪强度增加，但随围压的进一步增加，它出现降低的趋势，存在一个临界 围压，此临界围压值随温度的变化而变化，但不随应变速率而变化。  相似文献   

高分辨率地震技术探测采空区研究——以贾汪煤矿区为例   总被引：3，自引：0，他引：3  

刘建华  彭向峰  孙智峰 《高校地质学报》1996,(4)

高分辨率地震技术可广泛用于工程物探。本文主要利用高分辨率地震勘探探测采空区的位置和范围，为建筑物地基稳定性的评价提供可靠的依据；同时，从理论分析和野外试验两方面探讨了高分辨地震技术的野外数据采集、资料处理和资料解释，并简单介绍了在贾汪矿区的应用效果。研究结果表明，高分辨率地震技术能查明建筑场地内的采空区  相似文献   

地下巷道弹性位移反分析各种优化方法的探讨   总被引：16，自引：5，他引：16  

吕爱钟 《岩土力学》1996,17(2):29-34

探讨了６种最优化方法（鲍威尔法、单纯形加速法、阻尼最小二乘法、变尺度法、模式搜索法和变量轮换法）在巷道弹性位移反分析中的应用情况。从参数初始点的选择、收敛速度、收敛精度和可靠性方面评价了这６种无约束最优化方法的优劣。  相似文献   

多电极直流探测系统及其应用效果   总被引：2，自引：0，他引：2  

李志武  周燕云  刘永东  贺宁波 《物探与化探》1996,20(6):461-470,473

本文介绍地质矿产部机电所研制的多电极直流探测系统的主要技术性能,硬件和软件设计特点,数据处理软件的配置以及在不同领域勘探应用实例。  相似文献   

High Pressure-Differential Thermal Analysis and Ultrasonic Wave Amplitude Analysis of Ice-Water Equilibrium at 1.5-5.0GPa     

Xu Yousheng  Zheng Haifei  Xie Hongsen  Zhang Yueming  Xu Huigang  Guo Jie 《中国地球化学学报》1996,15(2):153-158

Water is the most active component in all geological systems.It has an important effect on the physical properties of minerals and melts.It also plays a key role in the evolution of the Earth.Accurate thermodynamics data on water are currently confined to pressures below 1.0GPa and temperatures below 900℃.Presented in this paper are new data available on the P-T properties of water at pressures up to 5.0GPa,develoged from differential thermal analysis and ultrasonic wave amplitude analysis.It has been found that there may exist another ternary point at 3.0GPa and that ultrasonic wave amplitude change of ice-water transition shows two inflection points above 2.0GPa, consistent with the two peaks of differential thermal curves above 2.0GPa .It may be a new phenomenon which needs further study.  相似文献   

0.25—3.75GPa和20—370℃条件下0.025molNaCl溶液电导率研究          下载免费PDF全文

郑海飞  谢鸿森 《地质学报》1997,71(3):274-280

在０．２５－３．７５ＧＰａ和２０－３７０℃条件下测量了ＮａＣｌ溶液的电导率。结果表明（１）电导率随温度增高而增大，且电导率的对数与温度的倒数为线性关系，但不同压力不其斜率不同。（２）电导率与压力的 关系较为复杂，存在着不连续性。即在２．２５－３．３７ＧＰａ压力范围，电导率随压力增大而增大；在１．２５－２．００ＧＰａ压力范围，电导率与压力几乎无关；０．７５ＧＰａ压力的电导率高于相邻力的电导率。上述。  相似文献   

江西广丰地区中奥陶统层序地层分析     

李晓勇 《江西地质》1997,11(2):20-24

本文通过对广丰县周家坞中奥陶统露头剖面层序、体系域、副层序的研究，识别出了三个不同性质的Ⅱ型层序界面和二个三级层序，确认这三个层序界面为符合实际又易于野外识别的自然界面，并对ＳＱ２中反映最大海泛期的高分辨异旋回驱动机制事件，提出可能受米兰柯维奇频率的春分点和秋分点间约２万年间隔的控制。  相似文献   

三维任意形体高密度电阻率法数值模拟方法     

杨文强 《物探化探计算技术》1997,19(3):270-273,278

为研究高密度电阻率法对各种三维地电体的反映规律，本文介绍了正演程序编制的方法并给出了计算实例。  相似文献   

Conductivity of NaCl solution at 0.4–5.0 GPa and 25–500 °C     

Yousheng Xu  Hongsen Xie  Jie Guo  Haifei Zheng  Yueming Zhang  Maoshuang Song 《中国科学D辑(英文版)》1997,40(4):398-402

NaCI-H₂O is the most fundamental ternary system in geology. Until now, the measurements of electrical conductivity of NaCl solutions are still little at high pressures (> O.5 GPa) We measured the conductivity of 0.01 m NaCl solution at 0.4–5.0 GPa and 25-500°C. The results are consistent with that of Quist and Marshall (1968) at 0.4 GPa. The conductivity of NaCl solution increases with increasing temperature. The results also show that the conductivity of NaCl solution changes little with increasing pressure below 1.5 GPa and changes rapidly with increasing pressure above 1.5 GPa. The rapid increase of the conductivity of NaCl solution may play an important role in many geological processes (such as the genesis of ore deposits under hydrothermal condition) and other fields. Project supported by the National Natural Science Foundation of China.  相似文献