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基于线性视觉流程的出版装帧应用研究 被引量:1
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作者 冯丽慧 《出版广角》 北大核心 2016年第6期57-59,共3页
在书籍出版装帧中,线性视觉流程具有多层次的价值,比如,情感性、功能性和审美性等。在线性视觉流程的前提下,对整个出版物版面、插画及文字进行合理的安排设计,既能够让装帧书籍传达信息内容,又可以体现很好的视觉美感。这也让书籍的阅... 在书籍出版装帧中,线性视觉流程具有多层次的价值,比如,情感性、功能性和审美性等。在线性视觉流程的前提下,对整个出版物版面、插画及文字进行合理的安排设计,既能够让装帧书籍传达信息内容,又可以体现很好的视觉美感。这也让书籍的阅读合理有效、趣味十足,更加彰显出版物的内在价值。 展开更多
关键词 线性视觉流程 出版 装帧
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SAR渐进扫描模式波位线性设计方法 被引量:3
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作者 杨威 李春升 +1 位作者 陈杰 薛伶玲 《系统工程与电子技术》 EI CSCD 北大核心 2011年第10期2198-2202,共5页
针对星载合成孔径雷达渐进扫描模式系统波位设计流程复杂、效率较低的问题,首先对星载合成孔径雷达渐进扫描模式系统波位设计中一些尚未被关注的问题开展研究及论证,包括方位向分辨率随距离向变化的特性、天线方位向偏扫引入栅瓣对方位... 针对星载合成孔径雷达渐进扫描模式系统波位设计流程复杂、效率较低的问题,首先对星载合成孔径雷达渐进扫描模式系统波位设计中一些尚未被关注的问题开展研究及论证,包括方位向分辨率随距离向变化的特性、天线方位向偏扫引入栅瓣对方位模糊度的影响以及时序关系同观测效率之间的关系。在此基础上提出线性流程的波位设计方法,该方法根据方位模糊度指标要求对脉冲重复频率进行优化选择,增加了系统设计的自由度,避免了迭代运算的过程,提升了系统波位设计的能力。最后通过仿真验证了本文方法的有效性。 展开更多
关键词 合成孔径雷达 波位设计 线性流程 方位向模糊度
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信息时代模具企业管理流程的设计与研究——应用“多工并行”流程模式缩短模具交货期
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作者 韩建文 雷毅 《中国塑料》 CAS CSCD 北大核心 2005年第2期95-99,共5页
从模具企业管理层面着手,针对模具制造业管理模式的现状,分析了线性工作流程的不足,提出了“多工并行”的工作流程解决方案。并以“多工并行”的流程设计和“集中分发”的信息交换渠道,构筑了信息时代的模具企业管理流程,以期缩短模具... 从模具企业管理层面着手,针对模具制造业管理模式的现状,分析了线性工作流程的不足,提出了“多工并行”的工作流程解决方案。并以“多工并行”的流程设计和“集中分发”的信息交换渠道,构筑了信息时代的模具企业管理流程,以期缩短模具制造周期,作为模具企业管理可供参考的管理框架。 展开更多
关键词 模具管理 工作流程 交货期 线性流程 并行流程
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A Nonlinear Flow Control Scheme Under Capacity Constraints
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作者 YiFan Zhong-PingJiang 《自动化学报》 EI CSCD 北大核心 2005年第1期64-74,共11页
We present a nonlinear flow control scheme based on a buffer management model with physical constraints. It extends previous result of Pitsillides et al. in [6] by improving the queue length regulation for better serv... We present a nonlinear flow control scheme based on a buffer management model with physical constraints. It extends previous result of Pitsillides et al. in [6] by improving the queue length regulation for better service of network traffics. Besides a single node system, we also address the decentralized control of many cascaded nodes. The proposed discontinuous controller asymptotically regulates the buffer queue length at the output port of a router/switch to a constant reference value, under unknown time varying interfering traffics and saturation constraints on control input and states. Its continuous approximation achieves practical regulation with an ultimate bound on the regulation error tunable by a design parameter. 展开更多
关键词 线性流程控制 容错计算 拥挤控制 缓冲器管理 渐近线调整
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Viscoelasto-plastic rheological experiment under circular increment step load and unload and nonlinear creep model of soft rocks 被引量:23
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作者 赵延林 曹平 +2 位作者 王卫军 万文 刘业科 《Journal of Central South University》 SCIE EI CAS 2009年第3期488-494,共7页
The viscoelastic-plastic creep experiments on soft ore-rock in Jinchuan Mine III were performed under circular increment step load and unload. The experimental data were analyzed according to instantaneous elastic str... The viscoelastic-plastic creep experiments on soft ore-rock in Jinchuan Mine III were performed under circular increment step load and unload. The experimental data were analyzed according to instantaneous elastic strain, visco-elastic strain, instantaneous plastic strain and visco-plastic strain. The result shows that instantaneous deformation modulus tends to increase with the increase of creep stress; soft rocks enhance the ability to resist instantaneous elastic deformation and instantaneous plastic deformation during the multi-level of load and unload in the cyclic process. In respect of specimen JC1099, the ratio of visco-elastic strain to visco-plastic strain varies from 3.15 to 6.58, and the ratio has decreasing tendency with stress increase as a whole; creep deformation tends to be a steady state at low stress level; soft rocks creep usually embodies accelerated creep properties at high stress level. With the damaging variable and the hardening function introduced, a nonlinear creep model of soft rocks is established, in which the decay creep is described by the nonlinear hardening function H of viscidity coefficient. The model can describe the accelerated creep of soft rocks since the nonlinear damaging evolvement variable D of deformation parameter of rocks is introduced. Three stages of soft rocks creep can be described with the uniform creep equation in the nonlinear creep model. With this nonlinear creep model applied to the creep experiments of the ore-rock of Jinchuan Mine III, the nonlinear creep model's curves are in good agreement with experimental data. 展开更多
关键词 rheological experiment nonlinear creep damaging HARDENING soft rocks
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Nonlinear flow numerical simulation of low-permeability reservoir 被引量:2
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作者 于荣泽 卞亚南 +3 位作者 周舒 王楷军 吕琦 陈朝辉 《Journal of Central South University》 SCIE EI CAS 2012年第7期1980-1987,共8页
A nonlinear flow reservoir mathematical model was established based on the flow characteristic of low-permeability reservoir.The well-grid equations were deduced and the dimensionless permeability coefficient was intr... A nonlinear flow reservoir mathematical model was established based on the flow characteristic of low-permeability reservoir.The well-grid equations were deduced and the dimensionless permeability coefficient was introduced to describe the permeability variation of nonlinear flow.The nonlinear flow numerical simulation program was compiled based on black-oil model.A quarter of five-spot well unit was simulated to study the effect of nonlinear flow on the exploitation of low-permeability reservoir.The comprehensive comparison and analysis of the simulation results of Darcy flow,quasi-linear flow and nonlinear flow were provided.The dimensionless permeability coefficient distribution was gained to describe the nonlinear flow degree.The result shows that compared with the results of Darcy flow,when considering nonlinear flow,the oil production is low,and production decline is rapid.The fluid flow in reservoir consumes more driving energy,which reduces the water flooding efficiency.Darcy flow model overstates the reservoir flow capability,and quasi-linear flow model overstates the reservoir flow resistance.The flow ability of the formation near the well and artificial fracture is strong while the flow ability of the formation far away from the main streamline is weak.The nonlinear flow area is much larger than that of quasi-linear flow during the fluid flow in low-permeability reservoir.The water propelling speed of nonlinear flow is greatly slower than that of Darcy flow in the vertical direction of artificial fracture,and the nonlinear flow should be taken into account in the well pattern arrangement of low-permeability reservoir. 展开更多
关键词 low-permeability reservoir nonlinear flow mathematical model numerical simulation
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Numerical modeling airflow in soil with impact of groundwater
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作者 张晓悦 王栋 +1 位作者 张晓乐 陈晓东 《Journal of Central South University》 SCIE EI CAS 2013年第5期1405-1411,共7页
In order to simulate the airflow in anhydrous case and the water-air flow in groundwater case, a numerical model of airflow in soil was developed. For the nonlinearity of the governing partial differential equation, t... In order to simulate the airflow in anhydrous case and the water-air flow in groundwater case, a numerical model of airflow in soil was developed. For the nonlinearity of the governing partial differential equation, the corresponding discretization and linearization methods were given. Due to the mass transfer between air-phase and water-phase, phase states of the model elements were constantly changing. Thus, parameters of the model were divided into primary ones and secondary ones, and the primary variables changing with phase states and the secondary variables can be obtained by their functional relationship with the primary variables. Additionally, the special definite condition of this numerical model was illustrated. Two examples were given to simulate the airflow in soil whether there was groundwater or not, and the effectiveness of the numerical model is verified by comparing the results of simulation with that of exoeriment. 展开更多
关键词 GROUNDWATER water-air flow capillary pressure finite difference method compressed air
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