六河路斜坡软土路段路基稳定处治技术

广西六寨至河池高速公路处于云贵高原与广西盆地过渡的斜坡地带,地形陡峻、地层岩性复杂。分布于炭质页岩路段斜坡浅表部的软土层具有弱膨胀性、富水易流塑变形等特点,严重影响路基稳定。研究斜坡软土特性,根据其工程性质和变形特点,提出路基稳定的工程处治关键技术措施。     

浅析风积砂在高速公路建设中的应用

根据“就地取材”的原则，京沈高速公路国际段有近７０ｋｍ的路基材料采用了当地唯一可取筑路材料－风积砂。在高速公路建设中如此大量使用风积砂填筑路基，在我省乃至全国尚属首例，为此，建设单位委托国际十四段于１９９７年４－５月份进行了１ｋｍ试验路段施工，本文根据其施工情况，就风积砂的力学性质，技术指标控制，施工工艺等应注意问题等做了简要论述。     

桂林-三江高速公路宛金段路线设计方案研究

山区复杂的地形、地质、水文和生态环境条件制约着公路路线方案的布置。文章以桂林-三江高速公路宛田-金桔段路线设计为例,通过对其沿线自然条件的分析,提出了针对性的路线设计方案,并结合原工可设计进行了方案比选,评价了所推荐方案的优越性,为山区高速公路设计研究提供依据。     

强夯加固在土石混填高填方路堤中的应用

文章结合重庆绕城高速公路西段刘家沟段实际地形,介绍采用沿线挖方土石材料进行强夯加固的填筑方法。通过分析影响强夯加固范围的各种因素,引用强夯加固范围的经验计算公式,得出夯锤落距及夯击次数,为土石混填高填方路堤的强夯加固设计提供参考。     

A New Full Bridge High Intensity Focused Ultrasound Power System with Harmonic Cancellation

The feasibility of a new full bridge high intensity focused ultrasound(HIFU) amplifier system with harmonic cancellation is evaluated in this study. Harmonic cancellation technique is applied to these power amplifiers, which can eliminate the 3rd harmonic and all even harmonics. Since this technique requires two channels of phase signal to control one channel of power amplifier, the signal generator is required to double its output. The transducer array proposed in this study has 100 elements. So we choose an FPGA chip to generate 200 driving signals, and each channel has a phase resolution of 2ns, less than 1°. The phase signal from the FPGA meets the requirement of driving the power amplifiers. The output waveform of one channel of power amplifier(voltage across the transducer) is evaluated, and shows fewer harmonic components.     

威海港实施地主港模式的迫切性可行性分析

<正>所谓地主港模式,就是政府通过规划界定港口的区域范围,委托港口管理机构代表国家拥有港区及后方一定范围内土地、岸线和基础设施的产权,对该范围内的土地、岸线、航道等进行统一     

Real-Time MRI-Controlled Ultrasound Hyperthermia System for Superficial Tumor Treatment

Ultrasound hyperthermia is one of the most important methods in tumor treatment and characterized by non-invasiveness. Magnetic resonance imaging（MRI）-based temperature mapping techniques are safe compared with invasive methods and have been applied to detect temperature changes for a variety of applications. Among these techniques, the proton resonance frequency（PRF） method is relatively advanced. With a temperature measuring experiment, the effectiveness of PRF method has been proved, because the outcome temperature curve and the real temperature curve fit well. After that, an experiment has been conducted on tumors inside rabbit legs and the result indicates that this system is able to performance hyperthermia at targets based on PRF method in temperature mapping.     

高速公路养护维修作业区安全状况分析

由于高速公路在运营过程中需要进行不断的养护维修,因此作业区普遍修建在各条高速公路上,作业区的存在造成高速公路局部路段通行条件恶化,形成高速公路交通安全的"瓶颈".从分析交通事故数据入手,比较了公路施工作业前后,作业区和非作业区的交通安全状况,得出作业区交通安全状况较差,是事故易发区;分析了作业区交通事故成因,得出标志不清、作业影响和车速过快3项主要原因.     

浅析影响石灰稳定土效果的几种因素

本文通过实验分析了对石灰稳定效果影响的几种因素，为科学施工提供了可行的途径。