Formation Mechanism of the Tongyu Gold Deposit,Shaanxi——A Discussion of a Model for the Formation of Syntectonic Gold Deposits

The formation of the Tongyu gold deposit, controlled by regional polyphase deformation-metamorphism.is closely related to the regional composite antiform-shear slip fracture zone. Late-stage reworking of theTaihua Group accounts for the enrichment of ore substances. It is a typical syntectonic gold deposit. The formation and evolution of the deposit involved four stages: (Ⅰ) the state of preparation of ore sub-stances, in which primary source beds originated: (Ⅱ) the stage of remobilization of ore substances, in whichregional progressive metamorphism and migmatization and thermodynamic-chemical differentiation led toremobilization of gold and its initial local concentration: (Ⅲ) the stage of gold deposit formation, in which re-gional folding produced concordant and cross shear-slip fractures and under the dynamic action gold was sepa-rated and migrated in a certain direction and concentrated to form a gold deposit: (Ⅳ) the stage ofsuperpositon, reworking and exposure of orebodies, in which the block uplifted and the deposit againunderwent reworking through faulting and mechanical differentiation.Thermodynamic mineralization played adominant role in the formation of the deposit.     

水平定向钻穿越工程的项目风险评价

随着我国城市化进程的加快,以及大型基础工程建设投入力度的加大,大型的水平定向钻穿越工程项目也越来越多,然而针对这类工程的风险评价却还不多。某大型天然气输气管道工程项目,投资多,风险大,事先进行风险评估十分必要。首先根据项目专家进行项目评估建立指标体系,然后结合模糊综合评价法和层次分析法各自的优点,针对该指标体系及专家所提供的评判数据,建立判断矩阵和隶属度矩阵并运用Matlab编程计算得权向量和隶属度向量,计算得出项目的风险值,得出相应的结论。     

高空西北气流下铜仁东部特大暴雨的预报分析及思考

利用贵州省预报业务常规、地面自动站加密观测资料、NCEP/FNL1°×1°再分析资料、业务数值预报模式,分析2020年6月29日铜仁市东部高空西北气流影响下的特大暴雨环境场特征,地面中小尺度场特征以及3家数值预报模式检验,初步分析产生此次特大暴雨的可能成因是在副高东南退,东北冷涡槽后高空西北气流维持,低层冷平流下传西输,地面辐合维持增强为涡旋,地面东路弱冷空气侵入,能量锋区斜压性增强;短临监测发现雷达回波有列车效应,低层辐合高层辐散的共轭配置,中层气旋式辐合;初步得出了西北气流影响下弱天气尺度环境场的铜仁市东部暴雨的预报着眼点。     

扬州江都区邵伯农田土壤环境质量及生态风险评价

选取扬州邵伯地区作为研究区,根据评价标准（GB 15618—2018）对其农田土壤环境质量及生态风险进行评价。研究区农田土壤中8种重金属元素平均含量均低于农用地污染风险筛选值,除Ni外其余7种重金属元素的平均含量均超过江苏土壤平均背景值,其中Hg含量均值为江苏土壤平均背景值的2.16倍;通过对比内梅罗指数法和综合指数法评价结果,认为综合指数法能更客观准确地反映研究区农田土壤环境质量状况,结果显示研究区农田土壤轻度污染以上样本占总样本的2.35%;研究区农田土壤属中度生态风险,综合潜在风险指数平均值为200.56,主要贡献因子是Hg。     

软基沉降观测及其数据处理方法

简述了高速公路软基沉降观测及其数据处理的目的和意义；介绍了沉降观测的布点原则；提出了高速公路软基沉降观测的技术要求；介绍了基于VB的高速公路软基沉降观测数据处理软件；在实际工程中，由于种种原因，会造成沉降观测数据不连续。本文就沉降观测数据不连续时的沉降量估算提出了三种处理方法，在实际工程应用中起到了较大的作用。     

A Novel Approach for Evaluating Nonstationary Response of Dynamic Systems to Stochastic Excitation

The transient state of a dynamic system, such as offshore structures, to random excitation is always nonstationary. Many studies have contributed to evaluating response covariances at the transient state of a linear multi-degree-of-freedom(MDOF) system to random excitations, but a closed-form solution was not available unless the excitation was assumed to be a physically unrealizable white noise process. This study derives explicit, closed-form solutions for the response covariances at the transient state by using a pole-residue(PR) approach operated in the Laplace domain when the excitations are assumed to be stationary random processes described by physically realizable spectral density functions. By using the PR method, we can analytically solve the triple integral in evaluating the nonstationary response covariance. As this approach uses the poles and residues of system transfer functions, rather than the conventional mode superposition technique, the method is applicable to MDOF systems with non-classical damping models. Particular application of the proposed method is demonstrated for multi-story shear buildings to stochastic ground acceleration characterized by the Kanai–Tajimi spectral density function model, and a numerical example is provided to illustrate the detailed steps. No numerical integrations are required for computing the response covariances as the exact closed-form solution has been derived. The correctness of the proposed method is numerically verified by Monte Carlo simulations.     

Screening of extraction methods for glycoproteins from jellyfish (Rhopilema esculentum) oral-arms by high performance liquid chromatography

In order to select an optimum extraction method for the target glycoprotein (TGP) from jellyfish (Rhopilema esculentum) oral-arms, a high performance liquid chromatography (HPLC)-assay for the determination of the TGP was developed. Purified target glycoprotein was taken as a standard glycoprotein. The results showed that the calibration curves for peak area plotted against concentration for TGP were linear (r = 0.9984, y = 4.5895x+47.601) over concentrations ranging from 50 to 400 mgL-1. The mean extraction recovery was 97.84% (CV2.60%). The fractions containing TGP were isolated from jellyfish (R. esculentum) oral-arms by four extraction methods: 1) water extraction (WE), 2) phosphate buffer solution (PBS) extraction (PE), 3) ultrasound-assisted water extraction (UA-WE), 4) ultrasound-assisted PBS extraction (UA-PE). The lyophilized extract was dissolved in Milli-Q water and analyzed directly on a short TSK-GEL G4000PWXL (7.8 mm×300 mm) column. Our results indicated that the UA-PE method was the optimum extraction method selected by HPLC.     

基于单视影像的地下通道3维重构方法

地下通道(包括隧道、巷道等)是一类重要的构筑物,重构其3维几何模型对于构建数字化操作平台有着重要的意义.在给定一个初始3维几何模型的条件下,利用地下通道影像上的线特征,通过人工交互方式获取相机的外方位元素及确定通道最终3维几何模型的参数,然后利用单视几何原理,通过反投影像点坐标即可计算得到详细准确的地下通道3维模型.实验表明该方法简捷有效,可以在实践中加以推广.     

Sea surface height variations in the Mindanao Dome region in response to the northern tropical Pacific winds

Sea surface height (SSH) variability in the Mindanao Dome (MD) region is found to be one of the strong variations in the northern Pacific. It is only weaker than that in the Kuroshio Extension area, and is comparable to that in the North Pacific Subtropical Countercurrent region. Based on a 1.5-layer reduced gravity model, we analyzed SSH variations in this region and their responses to northern tropical Pacific winds. The average SSH anomaly in the region varies mainly on a seasonal scale, with significant periods of 0.5 and 1 year, ENSO time scale2-7years, and time scale in excess of 8 years. Annual and long-term variabilities are comparably stronger. These variations are essentially a response to the northern tropical Pacific winds. On seasonal and ENSO time scales, they are mainly caused by wind anomalies east of the region, which generate westward-propagating, long Rossby waves. On time scales longer than 8 years, they are mostly induced by local Ekman pumping. Long-term SSH variations in the MD region and their responses to local winds are examined and discussed for the first time .