高职计算机基础教育的困境与对策研究

以培养学生具备一定计算机应用能力为主要目的的高职计算机基础教育目前存在有因学生计算机知识基础不同出现的教学效率低下,因目标不明确和缺乏与专业之间的必要沟通造成的理论知识偏多、针对性不强,因一定程度上的教学资源缺乏造成的教学改革举步维艰、教学方式相对单一.要突破计算机基础教育的困境需从明确教学目标、改革考核方式,实行分层...     

无线车载语音记录装置的设计与实现

为了规范乘务员的工作用语和协同监控装置分析行车事故，需要对机车电台和列尾装置自动录音，并可以在地面真实地再现列车运行中的呼叫应答情况．本文设计一种基于Wince操作系统实现双通道数字录音，适用于铁路机车的语音记录设备．它不仅可以通过与TAX2通信，取得时间和公里标信息，实现实时录音；还可以实现USB无线（Wi—Fi）和以太网等多种转储方式；另外通过前端数据库和上层解析软件，可以在转储仪或PC机上，按时间、车次和地点等信息对录音文件进行检索、转储和回放．该产品通过了运行试验和现场鉴定，实现小批量装车试用，满足维护铁路运行安全的需求．     

混凝土连续梁桥沥青铺装有限元分析

利用通用有限元软件对三跨预应力混凝土连续梁桥的沥青混凝土铺装进行应力分析,通过荷载不同位置下的沥青混凝土铺装层拉应力、剪应力分析,确定出荷栽的最不利布置位置。分析荷载最不利布置下铺装层模量对铺装层拉应力及层间剪应力的影响规律,为桥面铺装层材料选择及研究提供参考。     

Multi-agent immune recognition of water mine model

It is necessary for mine countermeasure systems to recognise the model of a water mine before destroying because the destroying measures to be taken must be determined according to mine model. In this paper, an immune neural network （INN） along with water mine model recognition system based on multi-agent system is proposed. A modified clonal selection algorithm for constructing such an INN is presented based on clonal selection principle. The INN is a two-layer Boolean network whose number of outputs is adaptable according to the task and the affinity threshold. Adjusting the affinity threshold can easily control different recognition precision, and the affinity threshold also can control the capability of noise tolerance.     

牵引电机温升试验方法及改善措施

根据标准IEC60349及IEC61377的要求进行牵引电机温升试验,针对牵引电机温升值不符合要求问题,本文提出通过采用固定逆变器输入侧的直流电压,增加牵引电机的输入电压增加调制深度的措施改善牵引电机的温升.试验结果表明增加调制深度,能够降低牵引电机温升,使得牵引电机的温升符合要求.     

The econometric estimation of airports’ cost function

The econometric estimation of cost functions has been proposed in the literature as a suitable approach in order to obtain estimations of marginal costs, efficiency levels and scale elasticities for transport industries. However, regarding the airport industry, no significant attention has been paid in developing an airport-specific estimation methodology rather than adapting the procedures applied to other industries. The lack of comparable airport data is one of the causes which could explain the scarcity of this literature in the past, as well as the use of very limited approaches to explain airport technology. This paper tries to overcome these limitations by developing an airport-specific methodology to estimate a multi-output long-run cost function using an unbalanced pooled database on 161 airports worldwide. The specification of hedonically-adjusted aircraft operations, domestic and international passengers, cargo and commercial revenues in the output vector, as well as the calculation of input prices are discussed. Both technical and allocative inefficiencies are specified in the model using a Stochastic Frontier method that has been estimated through Bayesian Inference and Markov Chain Monte Carlo methods.     

改变频驱动电机的星型为三角型接法与起重机低碳节能

利用变频V/F控制的原理,将电机从星型改成三角型接法,在保持电机相电流不变的基础上,可以将电机的相电压、线电流、电机功率、额定转速、基频均提升1.73倍,从而降低电机的制造成本,提高生产率,克服因电压不足可能引起的机电故障,节约能源,不失为近期起重机低碳节能的1个优选方案.     

25万t级矿石接卸码头机械取制样设施工艺设计

以连云港港旗台港区25万t级矿石码头机械取制样设施为例,介绍矿石机械取制样的工艺系统.该系统符合国际标准,功能完备,配置优化,布置科学,且充分考虑实际操作需要,体现了人性化的特点.     

强制风冷式制动鼓温升试验研究

介绍了新型强制风冷式制动鼓的结构和降温原理,建立了载货汽车下坡过程制动鼓温升模型,对新型强制风冷式制动鼓与原车制动鼓进行了连续下长坡工况下的制动鼓温升对比试验.试验结果表明.与原车制动鼓相比,新型强制风冷式制动鼓平均最高温度降低约13.5℃,具有良好的散热性能.     

The Brazilian National Plan for Coastal Management (PNGC)

The article is divided into three clearly defined sections. The first outlines the Brazilian National Coastal Zone Management Plan. The second offers a critical assessment of its introduction. To conclude, some general considerations are made. In this way, the author aims to achieve two objectives: to disseminate the aforementioned plan and offer a critical opinion of it.