改性沥青同步碎石上封层在 G109 线兰州段的应用

结合SBS改性沥青同步碎石在G109国道上的实际应用,得出SBS改性沥青同步碎石上封层可提高路面抵抗反射裂缝的能力,对路面裂缝、龟网裂有很好的修复作用,具备良好的防水性能和粘结性能,使路面抗滑,有施工速度快、成本支出小、施工简便等优点。     

建筑的隐性线秩序形态

建筑线秩序形态与其内在规律,乃自成一体。外在线秩序形态有其内在规律,且内在规律具有明晰的线性机制特征。这些线性机制为形态的内核与机理,控制并转化为建筑线秩序形态;线秩序形态又是线性机制的逻辑物化表达,是其本体的外显与图解。该文是基于建筑线秩序形态与线性机制间的逻辑关系的研究,可以成为建筑本体与表现相契合的一种途径,对如何运用线秩序方法构思出符合内在线性机制的建筑线秩序形态,具有重要的意义。     

广州海珠生态城生态安全格局的基础构建研究

伴随着经济的快速发展,我国城 市与自然生态保护的矛盾日益突出,生态安 全已经成为我国城市空间发展的重要前提。 作为广州市新型城市化背景下生态城市规划 的样本和示范,海珠生态城未来将建设成为 “以万亩果园为核心、具有岭南水乡魅力的 花城、水城、绿城特色生态城市样板区”。 构建海珠生态城的生态安全格局极为重要, 规划不应仅停留于理念、目标和方法研究 层面,而应更加突出生态文明实践,从战略 构想逐步走向规划实施。本文对海珠生态 城的生态安全格局的基础构建进行分析研 究,对广州中心城区的生态安全格局进行了 积极的探索     

似然函数和随机滤波的点云去噪方法研究

在获取物体的三维点云数据时,通常采用线结构光扫描的方法,但是在测量过程中不可避免的会产生不合理的噪声点.从而在进行曲面重构时,会导致重构的曲面不够光滑,进而会影响三维扫描物体重构的精确性,因此有必要对扫描数据进行去噪处理.噪声点产生的原因有很多,大部分噪声点具有幅值大,影响因素多的特点,所以利用似然估计函数得到采样局部...     

各种新型导线的特点及经济选型方法

本文介绍了目前广泛应用的各种新型导线的类型及特点。通过工程实例,提出了基于输电线路整个经济寿命周期的选型公式,适合在工程设计中应用。     

Stabilization loop of a two axes gimbal system using self-tuning PID type fuzzy controller

The application of inertial stabilization system is to stabilize the sensor's line of sight toward a target by isolating the sensor from the disturbances induced by the operating environment. The aim of this paper is to present two axes gimbal system. The gimbals torque relationships are derived using Lagrange equation considering the base angular motion and dynamic mass unbalance. The stabilization loops are constructed with cross coupling unit utilizing proposed fuzzy PID type controller. The overall control system is simulated and validated using MATLAB. Then, the performance of proposed controller is evaluated comparing with conventional PI controller in terms of transient response analysis and quantitative study of error analysis. The simulation results obtained in different conditions prove the efficiency of the proposed fuzzy controller which offers a better response than the classical one, and improves further the transient and steady-state performance.     

"肉制品加工关键技术研究与新产品开发"课题简介

“肉制品加工关键技术研究与新产品开发”是我国科技部“十五”攻关课题(项目编号：2001BA501A11)。该课题针对我国肉品产量连续14年位居世界第一，但肉类加工率低，高档肉制品缺乏的实际情况，对影响我国冷却肉和发酵肉制品加工中的关键技术问题进行了分析研究，并针对这些关键技术进行了3年的联合攻关，以提高我国肉类加工产业的整体水平。通过该课题成果的实施，目前已使冷却肉的初始茵数控制在10^3～10^4CFU/g；冷却肉在0～℃二的情况下，货架期和颜色稳定期达20d以上；冷却肉汁液流失率控制在1．5％以内；建立推广了6家生猪屠宰示范基地；选育了17种适用于不同类型发酵肉制品并具有自主知识产权的优良微生物发酵剂；研制开发了10种适合我国人民消费习惯的中式发酵肉制品及12种具有我国特色的西式发酵肉制品，并在浙江金华建立一条年产1000t发酵肉制品示范生产线。课题组已获国家发明专利4项，分别是一种复合发酵剂(专利受理号03126226．0)、2种单菌株发酵剂(专利受理号03126225．2、03126227．9)、一种食品脱毛剂(专利受理号03126224．4)。该课题对我国肉制品加工现代化提供了技术支撑。     

There is More to Streamgraphs than Movies: Better Aesthetics via Ordering and Lassoing

Streamgraphs were popularized in 2008 when The New York Times used them to visualize box office revenues for 7500 movies over 21 years. The aesthetics of a streamgraph is affected by three components: the ordering of the layers, the shape of the lowest curve of the drawing, known as the baseline, and the labels for the layers. As of today, the ordering and baseline computation algorithms proposed in the paper of Byron and Wattenberg are still considered the state of the art. However, their ordering algorithm exploits statistical properties of the movie revenue data that may not hold in other data . In addition, the baseline optimization is based on a definition of visual energy that in some cases results in considerable amount of visual distortion. We offer an ordering algorithm that works well regardless of the properties of the input data , and propose a 1‐norm based definition of visual energy and the associated solution method that overcomes the limitation of the original baseline optimization procedure. Furthermore, we propose an efficient layer labeling algorithm that scales linearly to the data size in place of the brute‐force algorithm adopted by Byron and Wattenberg. We demonstrate the advantage of our algorithms over existing techniques on a number of real world data sets.     

进口卸箱机的技术改造

通过分析瓶装自动化包装线中卸箱机的有关技术问题，经过技术改造提高了卸箱机的生产效率，降低了故障率。     

On the Dynamics of Lubricated Cylindrical Roller Bearings,Part I: Evaluation of Stiffness and Damping Characteristics

The stiffness and damping coefficients of a single roller-to-race contact of lubricated cylindrical roller bearings are numerically evaluated using a linearized perturbation method for both elastohydrodynamic lubrication (EHL) finite and infinite contact theories. A steady-state pressure equation is solved by a multilevel method and the elastic deformation is evaluated with the multilevel multi-integration method. Dynamic pressures are obtained by solving a set of perturbed pressure equations and are used to calculate the stiffness and damping coefficients. The influence of various nondimensional parameters (load parameter, speed parameter, material parameter, edge radius, and geometrical parameter) on the stiffness and damping are studied. The results show that a finite line contact gives higher values of stiffness and damping coefficients compared to an infinite contact, particularly at higher load and lower speed values. Based on the numerically evaluated data, curve-fitted relations for the stiffness and damping coefficients of a single roller-to-race contact are developed that can be used in the dynamic analysis of rotor–bearing systems.