阿城近50a气候变化特征分析

本文根据黑龙江省阿城市1961-2013年间的逐月气温和降水量资料,对阿城市近53 a的气候变化特征进行分析。结果表明:近53 a来阿城市年平均气温呈上升趋势,年平均气温以0.28℃/10 a的幅度上升,其中以冬季增温最为明显,春、秋季增温次之,而夏季的变化趋势则不明显。降水量的年变化略呈现下降趋势,年降水量大小存在波动变化,有一个2-3 a的变化周期,近10 a平均降水量比近50 a平均降水量减少了19 mm。     

信息化测绘条件下的地铁施工监测方法探讨

地铁施工监测是保障地铁安全施工的重要手段,同时也为由地铁施工引起的地表环境影响评价提供重要的数据支撑.文中在现代地铁施工技术背景下,以信息化测绘技术为支撑,对地铁施工监测的新内涵进行探讨,对地铁施工监测过程中的信息管理与反馈机制、主要方法进行系统论述与总结,并以某地铁站施工监测为例,对相关技术与方法进行检验,证明技术与方法的可行性和实用性.     

卫星双向法时间比对的归算

卫星双向法比对原理为两个台站同步发送和接收时间信号，可消除传递路径误差，因此比对精度高，它的缺点是效率低，占用大量卫星时间，也不适合于自动化操作，现正在研制的终端可多台站同时观测，克服了上述缺点，利用新的终端提出一种新的处理方法，研究表明多台站观测的同时性有更多的信息可提取，以提高比对精度。     

Relation between the “Double-Hump” Behavior in the Radio Band and the Broad-Line Luminosity for Blazars

The physics behind the spectral energy distribution (SED) of blazars remains open. We assembled 36 blazars to tackle the factors that control their SED. Now, many blazar spec- tra have the "double hump" feature in the radio and far-IR frequencies. For these a parameter, , is created to characterize the behavior of the SED. We found a significant correlation be- tween the broad-line luminosity (LBLR) and . Because LBLR is an indicator of the accreting power of the source in blazars, we derived a linear correlation, ∝ M˙1/3.18, which suggests that the SED of blazars may depend on the accretion rate, like that of BL Lac objects. We also found a significant correlation between ■ and for a sample of 11 blazars (out of one of 36) with available black hole masses. This implies the Eddington accretion ratio may influence the shape of the SED of blazars.     

贵州六盘水水城矿区小牛煤矿钻孔中断层发育特征分析

利用钻探岩心识别断裂形变、挤压扭曲、岩心破碎带等断层标志, 有利于勘探区构造地质条件的分析。通过对钻孔岩心岩性特征、地层厚度、煤层间距等方面的研究,发现ZK13钻孔在C51与C52煤层之间地层出现明显的揉皱与破碎现象、地层厚度与煤层间距增大,同时测井曲线显示地层有重复现象,推测在C51与C52煤层之间发育一逆断层;C54与C58煤层之间地层也比较破碎、地层厚度与煤层间距减小,伽玛伽玛曲线幅值增大,推测在C54与C58煤层之间发育一正断层。     

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日照市东南部地区榴辉岩矿矿石加工技术性能及选矿工艺研究

日照市东南部岚山安东卫、虎山地区位于苏鲁榴辉岩带南西段的中部,区域内赋存大型榴辉岩矿体,榴辉岩资源较丰富。榴辉岩含有的石榴子石、绿辉石、金红石都是应用很广的矿物,但榴辉岩的选矿工艺比较复杂,特别是其中金红石的选矿分离一直难以解决。该文就日照东南部地区的榴辉岩矿石的加工技术性能及选矿工艺进行了试验和探讨研究,为今后该区榴辉岩矿的开发利用打下了一定基础。     

MONITORING POLYNUCLEAR AROMATIC HYDROCARBONS IN SEDIMENT POREWATER BY SPMD

A new mimic biological Semi-permeable Membrane Device (SPMD) introduced for sampling organic pollutants yielded satisfactory results when it was frrst used as a passive sampler to concentrate and determine 16 kinds of polynuclear aromatic hydrocarbons (PAHs) by means of capillary GC on an HP 5890 GC-FID in coastal sediment perewater. The concentration of PAHs in sediment porewater for naphthalene(N), acenaphthlene(AL), acenaphthene (AE), fluorene (F), phenaphthene(P), anthracene(A), fluoranthene(FA), pyrene(Py), benzo[a]anthracene(B[a]A), chrysene(Chr), benzo[b] fluor- anthene(B[b]F), benzo[k]fluoranthene(B[k]F), benzo[a]pyrene(B[a]P),indeno[1,2,3,-cd]-Pyrene(I[123]P), dibenz[a,h]anthracene(D[ab]A) and benzo[g,h,i] perylene(B[ghi]P) were:50.36, under detection limits(UD), 18.19, 8.41, 8.40, 1.44, UD, 8.01, 524.15, 168.47, 50.13,123.66, 63.48, 27.40, 82.04 and 58,81 ng/L, respectively.     

Effect of growing watershed imperviousness on hydrograph parameters and peak discharge

An increasing impervious area is quickly extending over the Wu‐Tu watershed due to the endless demands of the people. Generally, impervious paving is a major result of urbanization and more recently has had the potential to produce more enormous flood disasters than those of the past. In this study, 40 available rainfall–runoff events were chosen to calibrate the applicable parameters of the models and to determine the relationships between the impervious surfaces and the calibrated parameters. Model inputs came from the outcomes of the block kriging method and the non‐linear programming method. In the optimal process, the shuffled complex evolution method and three criteria were applied to compare the observed and simulated hydrographs. The tendencies of the variations of the parameters with their corresponding imperviousness were established through regression analysis. Ten cases were used to examine the established equations of the parameters and impervious covers. Finally, the design flood routines of various return periods were furnished through use of approaches containing a design storm, block kriging, the SCS model, and a rainfall‐runoff model with established functional relationships. These simulated flood hydrographs were used to compare and understand the past, present, and future hydrological conditions of the watershed studied. In the research results, the time to peak of flood hydrographs for various storms was diminished approximately from 11 h to 6 h in different decrements, whereas peak flow increased respectively from 127 m³ s^?1 to 629 m³ s^?1 for different storm intensities. In addition, this study provides a design diagram for the peak flow ratio to help engineers and designers to construct hydraulic structures efficiently and prevent possible damage to human life and property. Copyright © 2007 John Wiley & Sons, Ltd.     

High-frequency near-bottom acoustic reflection signatures of hydrocarbon seeps on the Northern Gulf of Mexico continental slope

Acoustic reflection signatures of four hydro-carbon seeps were classified using near-bottom 25-kHz echosounder profiles. Echo patterns were compared with ground-truth data obtained by submersible observations and shallow coring. Six echo types were distinguished: strong reflections from (1)?exposed or (2)?buried hard substrates, such as authigenic carbonate or gas hydrate; acoustic scattering in (3)?unlayered or (4)?layered sediments owing to gas, shells, or disseminated carbonates; (5)?attenuation caused by gas; and (6)?undisturbed sediments. Echo type distributions suggest that high spatial variability indicates a younger, vigorous seep, whereas extensive hard substrate implies an older, encrusted seep.