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四川盆地广泛分布着碳酸盐岩，蕴藏着丰富的油气资源。本文试图通过总结前人有关四川盆地下二叠统的研究成果，寻找下二叠统潜在的、有利的勘探领域。大量的实钻、野外调查资料及研究成果表明，下二叠统主要的储集岩为粗结构、质纯的粒屑碳酸盐岩，而这种储集岩主要形成于滩相沉积，即下二叠统有利的储集相为滩相，它控制着下二叠统的储层发育。通过沉积相研究，认为下二叠统滩相主要分布于川西－川南的沿盆地边缘的弧形地带。由于川南地区（泸州－宜宾一带）下二叠统的勘探程度已较高，故认为今后下二叠统的重点勘探领域应在川西前陆盆地地区。     

在资源危机中生存与发展：介绍桦南金矿经验

桦南金矿是我国砂金开采历史悠久和生产方式较齐全矿山之一。随着开发时间延长而地质储量下降,所有六条生产采金船中,程度不同出现地质资源危机,成为我国所有砂金最危机矿山之一。企业领导采取一列系积极措施,近十年来黄金产量较稳定。桦南金矿扭转地质资源危机的经验,很值得有关砂金矿山借鉴。     

Predicting recreational water quality advisories: A comparison of statistical methods

Epidemiological studies indicate that fecal indicator bacteria (FIB) in beach water are associated with illnesses among people having contact with the water. In order to mitigate public health impacts, many beaches are posted with an advisory when the concentration of FIB exceeds a beach action value. The most commonly used method of measuring FIB concentration takes 18–24 h before returning a result. In order to avoid the 24 h lag, it has become common to ”nowcast” the FIB concentration using statistical regressions on environmental surrogate variables. Most commonly, nowcast models are estimated using ordinary least squares regression, but other regression methods from the statistical and machine learning literature are sometimes used. This study compares 14 regression methods across 7 Wisconsin beaches to identify which consistently produces the most accurate predictions. A random forest model is identified as the most accurate, followed by multiple regression fit using the adaptive LASSO.     

生态型排水系统的研究与开发

生态型排水系统是指遵循自然生态系统和工业生态系统的原则、符合物质闭环流动循环的经济模式。主要介绍了排水系统中的单一系统借助能量交换和物质循环形成一个有组织的功能复合体,即各系统都应与其周围环境友好互助,以减少对环境的影响。     

Predicting pathogen risks to aid beach management: The real value of quantitative microbial risk assessment (QMRA)

There has been an ongoing dilemma for agencies that set criteria for safe recreational waters in how to provide for a seasonal assessment of a beach site versus guidance for day-to-day management. Typically an overall ‘safe’ criterion level is derived from epidemiologic studies of sewage-impacted beaches. The decision criterion is based on a percentile value for a single sample or a moving median of a limited number (e.g. five per month) of routine samples, which are reported at least the day after recreator exposure has occurred. The focus of this paper is how to better undertake day-to-day recreational site monitoring and management. Internationally, good examples exist where predictive empirical regression models (based on rainfall, wind speed/direction, etc.) may provide an estimate of the target faecal indicator density for the day of exposure. However, at recreational swimming sites largely impacted by non-sewage sources of faecal indicators, there is concern that the indicator-illness associations derived from studies at sewage-impacted beaches may be inappropriate. Furthermore, some recent epidemiologic evidence supports the relationship to gastrointestinal (GI) illness with qPCR-derived measures of Bacteroidales/Bacteroides spp. as well as more traditional faecal indicators, but we understand less about the environmental fate of these molecular targets and their relationship to bather risk. Modelling pathogens and indicators within a quantitative microbial risk assessment framework is suggested as a way to explore the large diversity of scenarios for faecal contamination and hydrologic events, such as from waterfowl, agricultural animals, resuspended sediments and from the bathers themselves. Examples are provided that suggest that more site-specific targets derived by QMRA could provide insight, directly translatable to management actions.     

SMT设备的最新发展趋势

表面安装技术自80年代以来已在电子工业中得到了广泛应用和发展,文中就SMT设备未来的发展趋势作了初步分析,从中可以看出SMT设备与电子技术相互促进、协调发展密不可分的关系。     

Developing and monitoring an innovative NNBF to nourish a bay bar: An example from the southeast shore of Lake Ontario

This project tests a cost-effective, innovative dredged sediment placement technique targeted to nourish an eroded barrier bar. The dredged sediment was placed in the nearshore in a Cobble Bell, a form designed to allow for efficient dispersal and migration of sediment by natural processes in this location (such as predominant waves and longshore transport) in a desired direction along the bar. We describe the regional and site assessment undertaken, and explain the way design parameters including technical feasibility, assumptions about wave climate, and constructability were accounted for. A monitoring protocol was designed and implemented to measure the vertical and horizontal accretion on the barrier bar. This included survey transects using RTK equipment and surface analysis of beach volume and morphology change via drone images and photogrammetry. Field measurements of the bar indicated that within the first few days, the piled material eroded rapidly, and over the next few months, migrated downshore, widening the previously breached area. This suggests that the cobble bell nature-based feature has the potential to both accelerate and slow down natural processes in ways that enhance the performance and attractiveness of the beach while minimizing costs. In addition to the monitoring results, we describe a monitoring protocol that is both simple and effective which can be adapted by local entities interested in the management of their coastal landscapes.     

Controls on the geomorphic response of beach-dune systems to water level rise

This paper offers a synthesis of the disparate evidence on the importance of the magnitude and duration of water level rise in both lacustrine and marine environments in relation to other long-term controls on coastal response (e.g., wind climatology, vegetation growth, geological context). A brief review of two 'equilibrium profile' models (i.e., the Bruun and RDA models) is provided as a conceptual foundation before considering a range of complicating factors that are important to determining how sandy coasts may evolve in the future under rates of relative water level rise (RWLR) similar to recent increases in sea level. Key processes controlling beach-dune interaction are reviewed, especially the rates of morphodynamic action relative to the inundation potential driven by water level increases, leading to the conclusion that transgression distances due to RWLR are small in comparison to characteristic shoreline excursions driven by storm events and subsequent reconstruction phases. Much of the available evidence suggests that the beach and foredune (together with the nearshore profile) will migrate landward intact, keeping pace with relatively slow rates of RWLR similar in magnitude to those predicted by current sea-level scenarios. However, the documented response of shorelines in the Great Lakes to several episodes of relatively rapid rates of RWLR over a period of about a decade indicates that landward migration of the foredune through aeolian processes may be too slow to keep pace with this magnitude of shoreline transgression, and therefore the foredune will be over-run by the translating beach and nearshore profile.     

江苏汤山金矿自然重砂找矿标志研究

汤山金矿是江苏省发现的唯一一个小型微细浸染型独立金矿床。基于汤山金矿区1∶〖KG-*2〗20万、1∶〖KG-*2〗5万自然重砂建库数据,结合矿床矿石矿物组合特征,选择褐铁矿、黄铁矿、砷矿物（雄黄、雌黄、毒砂）、辰砂、自然银、铅矿物（自然铅、方铅矿、白铅矿）、闪锌矿、自然金、铜矿物（黄铜矿、斑铜矿、蓝铜矿、孔雀石）、重晶石等作为主要标型矿物,通过ZSAPS20软件,应用GIS平台,圈定自然重砂组合异常。通过异常特征剖析发现,黄铁矿和褐铁矿为汤山金矿直接指示矿物,自然金、闪锌矿、辰砂、毒砂、重晶石为汤山金矿次一级指示矿物。在此基础上,结合地质找矿标志,建立汤山金矿地质—自然重砂找矿标志,为深入评价汤山金矿找矿潜力提供自然重砂方面的依据。