一种提高港口通信质量的简易办法

随着经济的不断发展,港口逐步进入专业化和规模化.临近港区及港区内高层建筑物和厂房增多,港区腹地加大,造成港口无线通信多处盲区.无线电发射台与港口调度指挥中心在地域上没有得到统一,港口只能采取插转台或VHF摇控机,这就造成无线电资源的浪费和成本的增加.     

POLYMORPHISM OF THE vWF LOCUS AND ITS FORENSIC APPLICATION IN COMPACT BONE

Amplifiedfragmentlengthpolymorphisms(Amp--FLPs)havebeenevaluatedasusefulgeneticmarkersinforensiccaseworks{'~'].vWFpolymorphismisoneoftheAmp--FLPsdetectedbythepolymerasechainreaction(PCR).-PopulationdataconcerningvWFhasbeedpreviouslycarriedoutonEuropeanCaucasians[13.ButnodataisavailablefortheChinesepopulation.Inthisreport,wepresentthedataforvWFlocusin112unrelatedChineseHanindividualsanditsapplicabilityincompactboneanddens.MATERIALSANDMETHODS1.PrimersA:5'~ACGTATTCTATTTAT~3…     

桩基冻胀力三维问题的积分方程解法

利用叠加原理和弹性半空间的Ｍｉｎｄｌｉｎ公式，导出了计算桩基冻胀力三维问题的积分方程。用该积分方程可计算不可压缩和可压缩的桩基冻胀力，文末给出一算例，算例表明该理论结果和实测结果吻合良好     

摩托车曲轴系、链传动、阀系动力学模拟分析

应用AVL公司EXCITE软件，对某摩托车发动机扩展的配气机构进行了动力学分析，并建立了从活塞到气门的曲轴系、链传动、阀系的系统模型。通过建模可更清楚地掌握发动机实际动态工作状况；可为发动机整机动力学和发动机振动噪声分析提供更准确的边界条件。     

国内外地铁车站楼扶梯设计方法比较分析

地铁车站楼扶梯的通过能力直接影响着整个车站的交通效率,必须对其进行合理的规划与设计.英国在地铁车站楼扶梯设计方面有成熟的设计理论.介绍了英国关于地铁车站楼扶梯设计影响因素、楼梯设置宽度、自动扶梯技术参数和数量、楼扶梯通过能力和排队区域等的设计方法和规范,并将其与我国楼扶梯相关设计规范进行对比,总结出值得我国地铁设计工作者借鉴的国外设计经验.     

同饮一江之水 共建平安珠江

长长的珠江口，隔开了粤港澳三地；但悠悠珠江口，隔不断浓浓三地情。6月26日，来自粤港澳三地四方的海事主管部门、专家学者和港航物流企业的代表齐聚珠海，举行以“交通环境与安全航行”为主题的“2009珠江口海事安全论坛”。     

License plate extraction method for identification of vehicle violations at a railway level crossing

The primary cause of most railroad accidents is vehicle entry into railway level crossings despite warning messages. To identify drivers who violate railway level crossing regulations, vehicle license plate recognition can be applied at railway level crossings. The purpose of this paper is to present an effective method for extracting the license plate region from vehicle images taken at railway level crossings. The method proposed in this paper uses the variation in the gray-level values across the image of a license plate. For license plate region extraction, the character region is first recognized by identifying the character width and the difference between the background region and the character region. The license plate region is then extracted by finding the inter-character distance in the plate region. In addition, the license plate type is identified by the difference in the gray-level value between the background region and the character region. The proposed method is effective in solving the current challenges in extracting the license plate region from the damaged frames of license plates issued for domestic use, including new types of license plates. According to the experimental results, the proposed method yields a high extraction rate of 99.5% for vehicle license plates.     

Quality evaluation of car window motors using sound quality metrics

In this paper, a method to establish a decision criterion to evaluate the quality of small window motors using sound quality (SQ) metrics is suggested. Although the sound level radiated from the motor is relatively small compared to other sounds in a car, the sound from an abnormal motor gives an uncomfortable feeling and the impression of abnormal operation, which can lead to customer complaints. To construct an objective decision criterion, the correlation between the SQ metrics and the subjective decision on the passing or failure of the motor were investigated. Four representative SQ metrics, viz., loudness, sharpness, roughness, and fluctuation strength, were calculated for the collected samples. It was observed that the loudness and roughness of the motor sample group classified as abnormal was higher than those of the normal motors. For a single figure rating for motor quality, an evaluation index for the motor sound was generated by combining the correlated SQ metrics with proper weightings. Evaluation results on the specimens that were not employed in generating the quality evaluation index showed a reasonable agreement with the subjective test at 73%. The suggested quality check method can replace the current subjective decision procedure to identify the faulty motors.     

First-principles prediction of ductility in β-type Ti-Mo binary alloys

Recent studies suggest that the ratio of the shear modulus (G) to the bulk modulus (B) and the Poisson’s ratio (ν) are good indicators of ductility. Using the method of supercell and the first-principles pseudopotential plane-wave method, the G/B and ν of the β-type Ti-Mo binary alloys with Mo molar fraction (x _Mo) ranging from 6.25% to 37.5% are calculated. The results show that the ductility of β-type Ti-Mo binary alloys first increases with increasing x _Mo and reaches the maximum when x _Mo is about 25%, and then reduces with more increasing x _Mo. The charge density difference calculations suggest that the x _Mo dependence of the ductility can be ascribed to the change of bonding characteristics between Ti and Mo atoms in the [111] direction.     

唐山港曹妃甸港区某煤码头堆场封闭大棚设计

为了解决煤码头堆场煤尘问题,唐山港曹妃甸港区某煤码头堆场采用封闭大棚,项目建成投入使用后,产生了很好的抑制煤尘外溢的环保效果.封闭大棚建设方案可适用于通用码头煤堆场和专业化码头堆场,有效替代现阶段的防风网抑尘设施,控制粉尘污染效果明显,能极大改善和保护环境,环保效益特别显著,可使企业每年免缴大额排污费.