BIM技术在某大型码头设计中的应用研究

以某大型码头项目设计为案例,搭建云端协同平台开展各专业的BIM协同设计,基于三维可视化的场景,对项目方案进行了设计优化。各专业模型通过云端协同方式实时链接进行总装,项目协调员根据设计成果进行碰撞检测,及时发现设计问题。同时,针对BIM在设计阶段及施工阶段的需求,对BIM设计软件中的部分功能进行了二次开发,拓展BIM应用价值,更好地推动BIM技术在项目全生命周期中的落地和工程信息的流转。结合BIM技术在本项目的研究与应用,本文总结出了一套行之有效的BIM设计应用技术路线和解决方案,为BIM技术在码头设计中的应用与推广提供实际借鉴意义。     

利用CIVIL 3D进行海港工程疏浚设计方法研究

本文在南方某海港工程港池航道工程设计中引入BIM正向设计,利用CIVIL 3D建立了地形曲面和地质曲面模型,建立采样线,对地形曲面、设计曲面、地质曲面进行采样;用断面法进行疏浚工程量计算,用程序自带网格施工图及其他软件等多种方法进行校核以验证计算准确性;通过材质定义,计算不同土类疏浚量并在断面图中表示;在设计完成后,按...     

强迫布鲁塞尔振子相图的研究

针对强迫布鲁塞尔振子模型的Ｆａｒｅｙ序列与Ｍ．Ｓ．Ｓ序列进行了扩大区域的研究，表明单峰映中看成圆映象的近似，并建立了圆映象的相图，单峰映象的相图及符号动力学间的关系。     

用HPV L_1区共有引物及PCR技术检查人尖锐湿疣和子宫颈癌中的HPV

根据HPV6、11、16、18、31、33型L1ORF高度保守区的基因序列设计合成了一对HPVL1区共有引物。该引物除与上述六型有很高的同源性外还可覆盖其它已知的20多型与女性肛生殖区感染有关的HPV。用该引物及PCR技术对一组计144例活检标本进行检测，结果显示：病理确诊的尖锐湿疣、子宫颈癌及外阴癌组织、正常宫颈标本中HPVDNA序列检出率分别为100％（55／55）、70％（28／40）和13．3％（2／15）。另外，34例临床诊断而未被病理证实的尖锐湿疣HPV－DNA亦呈阳性，说明在对这类病变进行病理诊断时有必要进行病原学检测。     

Timing sequence changes of landscape plants in Shanghai Area,China

Based on published reports and direct observation, the common resources of landscape plant species in the Shanghai area were identified and studied in terms of the landscape characteristics of timing sequence changes over a one year time period. The results showed that there were 199 common landscape plant species in Shanghai, distributed in 67 families and 129 genera. These plants were categorized by three ornamental characteristics: flowers, foliage and fruits. The species were thus further analyzed according to the time periods which these characteristics were present. The results showed that flower ornamental distributed throughout the year, particularly from April to June, and plant species with colorful foliage could be seen every month, and particularly in November and December. On the other hand, few plant species with fruit ornamentals were observed in Shanghai area. The diversity of landscape timing sequence changes of the 199 plant species under examination was then analyzed by using the Shannon-Weiner and Simpson index formulas. The results showed that the higher diversity was observed in January, February and from August to October, while the lowest diversity was recorded from March to July and during November and December. The diversity of landscape characteristics of these plants was ranked according to foliage, flowers and fruit. Using this method, one park and one plant community were selected to evaluate the advantages and disadvantages of their time-changing plant landscape, with the goal of assessing the validity of the chosen ranking method. These results in the present study would be helpful to evaluate the plant landscape in a specified space and further enrich the diversity of plant and landscape by a target-oriented way.     

A mixed Bayesian network for two-dimensional decision modeling of departure time and mode choice

The modeling of travel decision making has been a popular topic in transportation planning. Previous studies focused on random-utility discrete choice models and machine learning methods. This paper proposes a new modeling approach that utilizes a mixed Bayesian network (BN) for travel decision inference. The authors use a predetermined BN structure and calculate priori and posterior probability distributions of the decision alternatives based on the observed explanatory variables. As a “utility-free” decision inference method, the BN model releases the linear structure in the utility function but assumes the traffic level of service variables follow multivariate Gaussian distribution conditional on the choice variable. A real-world case study is conducted by using the regional travel survey data for a two-dimensional decision modeling of both departure time choice and travel mode choice. The results indicate that a two-dimensional mixed BN provides better accuracy than decision tree models and nested logit models. In addition, one can derive continuous elasticity with respect to each continuous explanatory variable for sensitivity analysis. This new approach addresses a research gap in probabilistic travel decision making modeling as well as two-dimensional travel decision modeling.     

软刚臂系泊LNG-FSRU水动力模型试验研究

LNG-FSRU采用软刚臂单点系泊系统定位于特定海域在风、浪、流联合作用下进行作业,其运动非常复杂,必须进行水动力性能研究.本文针对35万立方米超大型LNG-FSRU,采用软刚臂单点系泊系统定位方式,开展了风、浪、流联合作用下水动力模型试验研究.软刚臂系泊系统软中各构件间的连接方式及Yoke重量相似是模型试验的关键,试验对该系泊系统的相似性进行了模拟,并将试验结果与数值计算结果进行了对比分析,结果显示,软刚臂系泊系统刚度曲线呈现非线性,试验结果与数值结果吻合良好,表明试验中对于软刚臂系泊系统的模拟是合理的,反映了LNG-FSRU在风、浪、流联合作用下的运动特性.     

Response-based analysis for Tension Leg Platform

The typical industry practice for Tension Leg Platform (TLP) design focuses on a conventional short-term design recipe, which assumes that an N-year design environment leads to an N-year response. In the response-based design method, the TLP is designed to withstand N-year responses rather than respond to N-year environmental conditions. In this paper, we present an overview and a general procedure for the response-based design method and use a case study to compare the critical TLP responses between the two methods. The results of our comparison show that the conventional short-term design method often contains an element of conservatism and that the response-based design method can reduce the design conditions and thereby achieve cost savings.     

高精度超短基线GAPS在水下定位中的应用

GAPS是法国IXSEA公司开发的勿需标定的便携式超短基线声学定位(USBL)惯性导航系统,集全球定位系统GPS、水下声学定位系统及姿态传感器于一体,具有安装方便、操作简单、精度高等特点.介绍高精度超短基线GAPS的安装方法、技术优势和工程中的实际应用,对使用过程中影响定位精度的主要因素、误差削弱方法进行简单分析.     

曹妃甸港区规划测量水位控制的探讨

唐山港曹妃甸港区规划工程测量项目,测量范围东起大清河口(捞鱼尖),西至南堡西侧,向南测量至-20 m等深线附近水域,其岸线长达61 km,测量面积达到1 148 km<'2>,是一项超大型的测量工程.结合曹妃甸港区规划工程测量,主要阐述如何对临时水位站进行布设,以及如何解决曹妃甸理论最低潮面与当地理论最低潮面的转换关系.