f—x域内提高地震资料的信噪比

在 f-x 域,地震记录可以表示成有限个调频调幅正弦波的叠合,叠合的结果是一个连续且光滑的函数。我们可以用一个简单的 n 次多项式去逼近这个函数。本文提出了一种在 f-x 域用最小平方拟合原理消除随机噪声的新方法,并证明了在噪声为自噪以及空间采样足够密的条件下,拟合结果与噪声无关,即 f-x 域最小平方拟合处理可以有效地消除记录上的随机白噪,而对有效信号的破坏甚微。由于理论上允许振幅值及同相轴形态在空间上发生变化,因而该方法不具有混波作用,是高分辨率处理的理想工具。     

光孤子相互作用对压缩态的影响

在线性近似条件下，量子化了非线性薛定谔方程，用后向传播法数值求解了光孤子相互作用对压缩比的影响。数值结果表明，在碰撞距离附近，压缩比显著增加。     

高效防气防砂一体化管柱的研制与应用

为解决文南油田高气液比井出砂易造成卡泵的问题,研制了高效防气防砂一体化管柱。该管柱主要由闭式气锚、重力式防气装置和激光割缝筛管3部分组成。闭式气锚的分离作用消除了气体对抽油泵的影响,提高了泵效;重力防气装置利用液气分离原理和高烟囱原理进行液气分离,液流回流时间可达10min,排气最高压差可达0.2MPa;经激光割缝筛管过滤后的液体含砂粒外径小于0.05mm。该管柱在文南油田现场应用16井次,累计增液6000t,增油2717t,平均单井泵效提高7%。     

用试井方法确定注水后地层渗透率的变化

大港油田已进入开发中后期，高含水油田占73％，开发初期的一些参数已不适合现在开发的需要。研究出一套用试井方法确定注水以后地层渗透率变化的方法，对大港油田的增储上产具有重要意义。     

On the hollowness ratio effect on the dynamics of a spinning Rayleigh beam

The analytical solutions of a spinning Rayleigh beam with rotatory moment inertia and gyroscopic effect are presented in this paper. The critical speeds can be written analytically in a function of the length-to-radius ratio (l) defined by the beam's length over its outer radius and the hollowness ratio (α) defined by the hollow area over the total area of the cross section. The sensitivity analyses show that the critical speed is decreasing with l, but increasing with α. Moreover, α is more sensitive to the critical speeds. The design of a spinning beam should therefore be emphasized more on the hollowness factor. Contrary to common belief, only finite critical speeds exist and the number is independent of the boundary conditions. It increases monotonically with l, but decreases with α. The steady state unbalanced response can therefore be expressed analytically by the finite precessional modes and the corresponding generalized coordinates.     

Nutrient removal performance of an anaerobic–anoxic–aerobic process as a function of influent C/P ratio

The laboratory scale anaerobic–anoxic–aerobic (A²O) process fed with synthetic brewage wastewater was designed to investigate the effects of changing feed C/P ratio on the performance of biological nutrient removal (BNR) processes. In the experiment, the influent chemical oxygen demand (COD) concentration was kept at approximately 300 mg L^?1 while the total phosphorus concentration was varied to obtain the desired C/P ratio. Results showed that when the C/P ratio was lower than 32, phosphorus removal efficiency increased as C/P ratio increased linearly, while when the C/P ratio was higher than 32, the P removal efficiency was maintained at 90–98%, and effluent P concentration was lower than 0.5 mg L^?1. However, regardless of the C/P ratio, excellent COD removal (90% or higher) and good total nitrogen removal (75–84%) were maintained throughout the experiments. It was also found that very good linear correlation was obtained between COD uptake per unit P released in the anaerobic zone and C/P ratio. In addition, the P content in the wasted activated sludge increased with the decrease in the C/P ratio. Based on the results, it was recommended that the wastewater C/P ratio and its effects be incorporated into BNR design and operational procedures, appropriate C/P ratios were used to achieve the effluent treatment goals. Copyright © 2005 Society of Chemical Industry     

复合沉淀氯化镨钕工艺研究

针对草酸沉淀成本高的问题，提出了复合沉淀的方法，试验结果及生产应用都证明了此方法能达到降耗同效的目的。     

承压水漏斗地区地下水位时空分布预报的BP网络模型

依据水均衡原理，导出承压水漏斗区任意一点水位与其影响因素之间的复杂的非线性关系，在此基础上提出承压水漏斗水位时空分布预报的BP神经网络模型。该模型具有 分布参数模型的特征，且不需用到区域的水文地质参数。最后针对某实例进行了模型设计及预报分析，通过对部分观测井后期实测数据的训练，优选出双隐层的网络结构及其网络参数。随后用这些观测井的前3年数据进行了检验，并对其他观测井数据进行预报。计算表明，该模型对地下水位拟合与预报的合格率较高，可以获得研究区域某一时刻水位在空间上的分布。     

流域输沙模数与流域面积关系研究

提出至今所有流域泥沙输移比与流域面积关系其实质都是流域输沙模数与流域面积的关系。前人的流域输沙模数与流域面积关系的研究结论认为一般都是呈现反比关系，黄河中游流域输沙模数与流域面积不是这样的关系，这是一个特例。本文通过三个不同层面，即长江干流、黄河干流，长江上游、黄河中游主要支流及任意流域的流域输沙模数与流域面积关系的分析研究，认为黄河中游流域输沙模数与流域面积不是反比关系，这不是特例。因为，长江上游无论是干流还是支流或任意流域的流域输沙模数与流域面积同样不存在一个规律的反比关系。流域输沙模数与流域面积的真正关系不是受控于流域面积的大小，而是取决于流域所在区域的地质构造单元的性质、地貌类型及土地利用的合理性等多个因素，其中最本质的是地貌类型、地质构造单元的活动性质及控制面积。本研究可以推进河流泥沙学科的发展、开拓环境学科的研究思路和有助于流域大型水库的泥沙淤积前景的科学预测；同时对流域尺度转换理论在地学中的正确应用的可能性也是有重要的启迪作用。     

降低氧化铝生产中熟料折合比的探讨

在氧化铝生产过程中，熟料折合比是烧结法一项重要的综合性指标，本文通过对熟料折合比的定义、计算公式的剖析，分析了生产过程中影响熟料折合比的主要因素，对有效降低熟料折合比的措施进行了探讨。