An approach to refined mapping of the anomalous gravity field in the Earth’s polar caps

This work describes the different sets of instruments and methodic approaches for testing the models of gravity anomalies by repeated airborne gravimetric surveys in the polar cap regions of the Earth. The survey design including the specifications for flying the survey profiles and the arrangement of the base stations in polar areas is described, and the necessary modifications of the airborne gravity metering complexes for high-latitude measurements are suggested.     

Stellar mass estimation based on IRAC photometry for Spitzer SWIRE-field galaxies

We analyze the feasibility of estimating the stellar mass of galaxies by mid-infrared luminosities based on a large sample of galaxies cross-identified from Spitzer SWIRE fields and the SDSS spectrographic survey.We derived the formulae to calculate the stellar mass by using IRAC 3.6 μm and 4.5 μm luminosities.The massto-luminosity ratios of IRAC 3.6 μm and 4.5 μm luminosities are more sensitive to the star formation history of galaxies than to other factors,such as the intrinsic extinction,metallicity and star formation rate.To remove the effect of star formation history,we used g-r color to recalibrate the formulae and obtain a better result.Researchers must be more careful when estimating the stellar mass of low metallicity galaxies using our formulae.Due to the emission from dust heated by the hottest young stars,luminous infrared galaxies present higher IRAC 4.5 μm luminosities compared to IRAC 3.6 μm luminosities.For most of type-Ⅱ AGNs,the nuclear activity cannot enhance 3.6 μm and 4.5 μm luminosities compared with normal galaxies.Star formation in our AGNhosting galaxies is also very weak,almost all of which are early-type galaxies.     

东北地区中元古代地层划分与对比研究

根据全国地层委员会中国中新元古代地层年表的新方案和近年的来新研究成果,对东北地区中元古代地层岩性、同位索年龄、叠层石以及地层接触关系等进行了研究,对区内中元古界岩石地层单位进行了核实,辽宁的长城系(1.8～1.6 Ga)包括常州沟组、串岭沟组、团山子组、大红峪组,蓟县系(1.6～1.4 Ga)包括高于庄组、杨庄组、雾迷...     

Hurricane winds on the territory of Georgia

The statistical structure of hurricane winds is studied using the data of observation at 50 meteorological stations in Georgia for the period of 1961–2008. Determined are the number of days and the duration of hurricane winds in different regions of the country. Studied are the empirical functions of their distribution and the areal limits.     

一株产琼胶酶海洋细菌的分离与鉴定

为获得琼胶酶活性高产菌株,对采集的海水样品进行了产酶微生物的分离、筛选和鉴定。经过平板培养预筛和两次摇瓶培养筛选,从浙江省舟山市普陀区近海海水样品中分离到一株琼胶酶产生菌G-5,该菌株液体培养产酶活力可达到413.8 U/mL。G-5菌株的菌落呈乳白色、半透明、表面湿润;菌体革兰氏染色阴性,大小0.58~0.69 μm1.50~2.26 μm;光学显微镜下呈短杆状,略有弧形。G-5菌株的16S rDNA序列与NCBI数据库中15个弧菌属（Vibrio）菌株的16S rDNA有98%的同源性,可以确定G-5菌株是一株弧菌（Vibrio sp.）。     

多尺度地震资料联合成像

为改善储层目标区域的成像质量,结合地面地震、VSP和井间地震的各自优势,采用归一化后的自适应叠加方法,实现3种资料偏移结果的联合成像,以达到各种资料优势互补、提高成像精度的目的。为了给联合成像提供精度较高的单种资料成像剖面,采用傅里叶有限差分叠前深度偏移算法实现地面地震资料成像;在VSP和井间地震资料的叠前成像中采用了基于起伏地表直接下延法成像思想,基于傅里叶有限差分延拓算子得到VSP和井间地震偏移结果。模型试算和实际资料的处理验证了多尺度地震资料联合成像法的正确性和有效性。     

Determination of importance for comprehensive topographic factors on landslide hazard mapping using artificial neural network

A landslide is one of the natural disasters that occur in Malaysia. In addition to the geological factor and the rain as triggering factor, topographic factors such as elevation, slope angle, slope aspect, and curvature are considered as the main causes of landslides. The study in this paper was conducted in three stages. The first stage involved the extraction of extra topographic factors. Previous landslide studies had identified only four of the topographic factors. However, eight new additional factors have also been identified in this study. They are general curvature, longitudinal curvature, tangential curvature, cross-section curvature, surface area, diagonal line length, surface roughness, and rugosity. At this stage, 13 factors were extracted from the digital elevation model. The second stage involved specifying the importance of each factor. The multilayer perceptron network and backpropagation algorithm were used to specify the weight of each factor. Results were verified using the receiver operating characteristics based on the area under the curve method in the third stage. The results indicated 76.07 % accuracy in predicting of landslides, with slope angle as the most important factor while the tangential curvature has the least importance.