如何用C^＋＋处理位图显示

首先对WINDOWS中的位图文件结构作较详细的分析,然后提出用C编程处理位图显示的方法,并给出有关的程序代码。     

废黄河竖井双层涵洞试验研究

试验研究了废黄河竖井双层涵洞输送水流和泥沙运动特性。试验表明：竖井进口段过水断面呈渐趋收缩状,涵洞泄流能力增大;在通过小流量时,下层涵洞流速大,有利于依靠水力输沙;双层涵洞中间隔层具有随上下层涵洞流速差减小、脉动压力影响趋于微弱的性质。提出了轮换开启部分闸门,使开启涵洞内平均流速大于泥沙不淤流速的调控方法,解决了双层涵洞安全输送泥沙的工程措施问题。     

用铁砂研制铁氧体电波吸收材料

以铁砂为原料制备一种尖晶石型铁氧体电波吸收材料,在７－１２ＧＨｚ范围,发现有两个吸收峰,吸收量在９－１３ｄｂ;将铁氧体吸收体和铁砂吸收体组成复合电波吸收材料,亦有两个吸收峰,一峰向低频区偏移,吸收量增至１４．５ｄｂ;以复合吸收体为基础材料,在其中添加六角铁氧体和稀土元素,可改变吸收峰位置,提高吸收量,最大可达２７ｄｂ。     

跳水运动中"水花"成形机理及"压水花"技术的探讨--跳水"压水花"技术研究系列论文之二

在对人、水碰撞过程进行计算机模拟方面已经取得阶段性成果的基础上,根据有关流体力学理论和力学原理,重点对“水花”形成的机理进行进一步的分析.把运动员两手臂上举,两手合掌成尖锐状的入水动作简化为“楔形体”、把两手臂上举,顶肩翻掌以手掌平面撞入水面的动作简化为“方形体”,把具有翻转速度平掌撞水的动作简化为“翻转方形体”,分别探讨和总结出不同形状固体、在不同条件下撞击水面时“水花”形成的规律,根据这个规律,对“压水花”技术进行生物力学研究,提出了撞、揉结合的“压水花”理论.     

悬砂稠化剂流变特性研究

研制出一种具有三维网络状结构的悬砂稠化剂，该稠化剂具有极强的悬砂能力，能与山砂以任意的配比形成复合浆体，并将山砂和水固结在一起而不脱水，极大地提高了砂浆防灭火效果；此外使砂不易堵管，大大地降低砂子对管道的磨损，并有利于管道长距离输送．并对悬砂稠化剂流变特性进行了研究，得到该稠化剂是具有剪切稀化特性的假塑性非牛顿流体；当悬砂稠化剂浓度为0．4％时，溶液具有最佳的流体力学特性；同时悬砂稠化剂的粘度与Ca^2＋离子浓度、Na^＋离子浓度、pH值、温度以及存放时间等因素密切相关．最后，用悬砂稠化剂进行了悬浮山砂的实验，制备出具有优良防灭火性能的稠化砂浆．图7，参8。     

The age of formation of the mirabilite and sand wedges in the Hexi Corridor and their paleoclimatic interpretation

The Hexi Corridor is located at the transition zone of the Asian summer monsoon and westerly airflow, and lies in an important position in terms of its ecological fragility and climatic sensitivity. During a recent field expedition to this region, we found a sedimentary mirabilite layer in a number of localities including Suwushan, Yanchi, Baitujing, Yanchi Gaotai, Huahai, Yumen, Halanuo扙r, and Dunhuang (Fig. 1), which have the potential to provide important information about environmenta…     

Contributions of different land cover types in Otindag Sandy Land and Bashang area of Hebei Province to the material source of sand stormy weather in Beijing

Different land cover types in Otindag Sandy Land and Bashang area of Hebei Province are linked to a material source of sand stormy weather in Beijing based on results of field vegetation and soil survey and laboratory works. Results of grain size analysis show that dust release potential in per unit area of moving sandy land is small,while lowland meadow and meadow steppe in stony hills have high potential of releasing dusts in per unit area during sand stormy weather occurrence. Further considering the effects of vegetation, it is inferred that the moving sandy land served as a material source of past dust storm and the possibility of dust release in per unit area is low in current time.Typical steppe in stony hills is undergoing desertification and its dust release possibility in per unit area is high. Farmland has strong potential of release dusts when they are ploughed in spring, but a large amount of therophytes grow and thus prevent dusts from release when cultivation was terminated.Potentials of dust release in per unit area in fixed sand dunes,stony mountain meadow steppe and low land meadow are lowdue to high cover of perennials. Sand dune reactivation and desiccation of lakes and lowlands under estimated future climatic change will make them serve as a future material source of sand stormy weather.     

地基液化的处理措施

砂土地基在地震动荷载作用下会发生液化，使地基丧失承载力，建筑物产生大量不均匀沉降，造成建筑物开裂、倾斜或破坏，国家财产和人民生命遭受损失。通过分析液化的形成条件及本身特性，提出了在设计中全部消除地基波化沉陷，部分消除地基液化沉陷和减轻液化影响的措施。     

低含水率沙床的临界起沙风速

针对目前对风沙起动机制的认识有限的现状，采用量钢分析法推导出对湿沙床的起沙有影响的4个无量纲数。经分析得到起沙风速与沙床沙粒粒径和沙床粘结力间的数量关系。通过建立沙床粘结力与含水率、沙粒粒径的关系式，得到临界起沙风速和沙粒粒径，含水率间的定量关系式。认为低含水率沙床的风沙起动风速与颗粒粒径的一次方和沙床含水率的1／4次方成线性关系，此结论与前人的实验结果符合得很好。     

我国建筑业如何迎接入世的挑战

面对入世对我国建筑业所产生的巨大影响，提出了我国建筑企业必须加强学习、尽快与国际惯例接轨、提高从业人员素质、优化质量管理、加大科技投入、注重安全生产，以新的姿态迎接入世的挑战。