供水管井允许出水量的合理确定

每一眼管井在井结构确定的条件下,有一个最大允许出水量,而盲目追求增大出水量,势必造成管井涌砂,过滤管腐蚀和堵塞的加剧。松散含水层供水管井允许出水量既要满足地下水允许开采量“宏观”定义要求,从供水管井使用寿命考虑又要满足管井两个流速参数:井壁允许进水流速和滤管允许进水流速。本文给出了管井允许出水量确定方法和计算框图,并以实例说明之,在具体应用时某些细节也予以了说明。     

圆钢管混凝土压弯构件荷载一位移滞回性能分析

在空钢管中填充混凝土可以避免或延缓钢管过早地发生局部屈曲，并有效地提高构件的延性，从而增强构件的抗震性能，本文在对圆钢管混凝土构件弯矩－曲率关系分析的基础上，分析了圆钢管混凝土压弯构件P－△滞回关系曲线，理论计算结果得到国内外大量结果的验证，基于理论分析模型，分析了各参，如构件轴压比，长细比，截面含钢率和材料强度等因素对圆钢管混凝土压变变构件P－△滞回关系曲线的影响，最后，确定了圆钢管混凝土压弯构件P－△恢复力学模型和延性系数的简化计算方法。     

对西金大厦基坑降水工程的思考

西金大厦场地勘察工作于1994年8月完成，5年以后开始基坑降水工作，本文分析场地地下水现状，剖析降水设计方案，提出有针对性的降水新构想。     

Broadband synthetic aperture borehole radar interferometry

Trials in mines have established that wideband VHF borehole radars (BHR), working in the 10–100-MHz band, can be used to probe the rockmass between boreholes over ranges from <5 m to as much as 150 m with submeter resolution. There is evidence that ore bodies reflect these radar signals both specularly and diffusely, much as the ground/air interface does when overflown by synthetic aperture radar (SAR). In both SAR and BHR, multiple flight lines, together with diffuse reflections admit the possibility of developing interferometric 3D images of the object. This paper examines the possibility of imaging buried objects in three dimensions by interferometrically combining broadband VHF borehole radar profiles shot in adjacent pairs of boreholes. Broadbanding in BHR has the advantage of releasing the image from 2nπ phase ambiguities, but practically, interferometric borehole radar (InBHR) needs high signal-to-noise ratios (SNR) to avoid noise capture. This means that 3D InBHR is limited to ranges in wavelengths which are less than the rock's attenuation factor Q. Interferometric methods are developed which are capable of mapping ore bodies and other structures in three dimensions. Tangent plane migration methods are developed here in order to reconstruct surfaces that lie in the near-field of sparse interferometric arrays.     

CT球管耙心偏移的检测与判断

ＣＴ球管耙偏移是较为少见的，本文以ＧＥ ｓｙｔｅｃ ２０００ｉ为例，详细描述了由此引起的扫描停止，机器伪影等现象及分析、处理过程，并通过与管衰老相比较。进一步述了两者的共同点及在图像质量，管电流稳定性，检测过程等方面的区别，最后总结出一套检测与判断耙心偏移的方法。     

影响CT球管寿命的非质量因素

影响ＣＴ球管寿命的非质量因素是指对其使用寿命的长短产生影响的因素。笔者通过对多年工作实践的总结，从操作技术、维修保养等方面探讨诸因素对ＣＴ球管寿命的影响。     

基于伴随方法的线性台阵背景噪声面波和远震体波联合成像研究

伴随层析成像（Adjoint Tomography）通过求解全波方程来准确模拟地震波在复杂介质中的传播,并利用波形信息来反演地下结构,是新一代的高分辨率成像方法.其中3-D伴随层析成像需要庞大的计算资源,而2-D反演相对更具计算效率.面波和远震体波是研究地壳上地幔速度结构的重要方法,它们对S波速度及Moho面的敏感度不同,通过联合反演,可以得到更为准确的S波速度结构及Moho面.通过两种数据的高度互补性,本文提出基于伴随方法的线性台阵背景噪声面波和远震体波联合成像方法,同时约束台阵下方S波速度结构及Moho面形态.我们将该方法应用到符合华北克拉通岩石圈典型结构特征的理论模型上,测试结果表明联合反演方法优势明显,相比于面波伴随层析成像,能获得更高分辨率的S波速度结构,同时能精准约束Moho面形态.相比于体波伴随层析成像,联合反演能有效压制高频假象,降低波形反演过程中的非线性化程度.本研究有望提供一种更为高效精准的线性台阵成像方法,搭建联合伴随层析成像理论框架,提升岩石圈成像分辨率,并为后续其他类型波形数据的引入提供思路和方法.     

New approach to milling circuit control—robust inverse Nyquist array design

The aim of this paper is to present an application of robust inverse Nyquist array control design method to a milling circuit in Majdanpek Copper Mine. An existent model of a milling circuit was adopted to respond to robust inverse Nyquist array methodology demand by introducing model uncertainty, and optimal robust controller of milling circuit is designed. The proposed controller is robust for reference signals. The robustness of multivariable feedback systems with designed controller is tested and compared with different, previously designed multivariable controllers. Simulation results, in time domain, demonstrate the preferable performance of the designed robust controller in setpoint tracking. Implementation of the new controller without any investments in new equipment significantly improves performance of the milling process.     

卫星摄影三线阵CCD影像的EEP法空中三角测量（三）

4 平差方案及模拟数据平差实验4.1 自由网+控制点空中三角测量由前方交会(2.1)式,后方交会(2.2)式以及外方位元素平滑制约条件(2.3)式,可以构成类似经典的光束法空中三角测量,但由于EFP像点坐标是推算出来的,所以控制点不宜直接参与平差过程.于是平差要分成自由网平差及利用控制点作三维线性变换两个步骤.另一方面,卫星摄影中起始角元素大约在±0.5°左右,对于经典空中三角测量,角元素起始近似值均可按零处理.但在EFP平差中,φ角起始值φ0对空中三角测量,像元素起始近似值均可按零处理.在EFP平差中,φ角起始值φ0对整条航线的几何状态影响很大,必须采用特殊的程序预先加以确定.我们采用不断步进φ角值,比较由前方交会及(1.2)式计算的Y视差的均方根值最小者,即作为φ的最佳起始值.平差框图见图4.