龙陵地震震害与地质

前言1976年5月29日20点23分与22点00分,在我国云南省龙陵县境内,连续发生了7.5和7.6级两个强烈地震,震中烈度为9度。由于这次地震之前曾经有过预报,因此伤亡极少,但是地面建筑物却遭到严重破坏。破坏比较严重的地区是龙陵县,特别是龙陵县东部的几个公社,如镇安、勐冒、朝阳、平达等公社。在上述公社境内,房屋破坏严重,地面开裂,出现大量的剥落(当地群众称之为山扒皮)、崩塌、滑坡、滚石和地裂缝。     

直流电弧放电中的高温化学反应

本文对近年来国内外关于直流电弧放电中的高温化学反应的应用进展进行了综述。附参考文献72篇。     

灵山沟金矿围岩蚀变形成机制酸碱演化特征及对成矿作用的意义

通过对灵山沟金矿围岩蚀变带特征的研究,阐明了灵山沟金矿围岩蚀变以碱交代为主,成矿热液为壳源深熔花岗岩浆演化期后热液,并指出围岩蚀变的发育程度与金矿化有密切的关系。     

海域煤层防水安全煤柱估算方法评述——以山东省黄县煤田梁家煤矿扩大区（西海域）为例

山东省黄县煤田梁家煤矿位扩大区位于龙口湾内,水文地质条件与陆地不同,通过海域钻孔资料分析,划分出松散层及煤层和顶底板含隔水层,结合伺服试验结果进行充水因素分析,计算导水裂隙带高度和防水煤柱高度,从而合理留设防水安全煤柱,为安全采煤提供重要依据。     

三维地震勘探在山东省黄县煤田梁家煤矿海上煤田的应用

山东省黄县煤田梁家煤矿扩大区位于滩涂区和海水区结合处,该区域无法采用同一种震源和统一的观测系统,为取得更为准确的野外资料,提出了野外工作根据试验结果采用2种震源和微变观测系统;室内处理前进行子波一致性处理;解释工作在SUNULTR60工作站上进行,根据实际情况进行分析解释。最终取得了较为显著的地质效果。     

Spatial distribution of maize in response to climate change in northeast China during 1980–2010

Based on county-level crop statistics and other ancillary information, spatial distribution of maize in the major maize-growing areas (latitudes 39°–48°N) was modelled for the period 1980–2010 by using a cross-entropy-based spatial allocation model. Maize extended as far north as the northern part of the Lesser Khingan Mountains during the period, and the area sown to maize increased by about 5 million ha. More than half of the increase occurred before 2000, and more than 80% of it in the climate transitional zone, where the annual accumulated temperature (AAT) was 2800–3400 °C·d. Regions with AAT of 3800–4000 °C·d became more important, accounting for more than 25% of the increase after 2000. The expansion of maize was thus closely related to warming, although some variation in the distribution was noticed across zones in relation to the warming, indicating that maize in northeast China may have adapted successfully to the warming by adjusting its spatial distribution to match the changed climate.     

五桂山北麓断裂及其活动性

近年通过地震地质、工程地震、工程钻探、地球物理．地球化学等多项工作,不仅确认了五桂山北麓断裂的存在,而且证明它是一条具有较大规模的断裂,晚第四纪以来仍有一定的活动性。     

Effects of uncertainties in the position and orientation of both the transmitter and receivers on marine controlled-source electromagnetic data

Simulation and interpretation of marine controlled-source electromagnetic (CSEM) data often approximate the transmitter source as an ideal horizontal electric dipole (HED) and assume that the receivers are located on a flat seabed. Actually, however, the transmitter dipole source will be rotated, tilted and deviated from the survey profile due to ocean currents. And free-fall receivers may be also rotated to some arbitrary horizontal orientation and located on sloping seafloor. In this paper, we investigate the effects of uncertainties in the transmitter tilt, transmitter rotation and transmitter deviation from the survey profile as well as in the receiver’s location and orientation on marine CSEM data. The model study shows that the uncertainties of all position and orientation parameters of both the transmitter and receivers can propagate into observed data uncertainties, but to a different extent. In interpreting marine data, field data uncertainties caused by the position and orientation uncertainties of both the transmitter and receivers need to be taken into account.     

Purification and characterization of cold-active endo-1,4-β-glucanase produced by Pseudoalteromonas sp. AN545 from Antarctica

A bacterium hydrolyzing carboxymethylcellulose, isolated from Antarctic sea ice, was identified as Pseudoalteromonas sp. based on 16S rDNA gene sequences and named as Pseudoalteromonas sp. AN545. The extracellular endo-1,4-β-glucanase AN-1 was purified successively by ammonium sulfate precipitation, DEAE-Sepharose ion exchange chromatography and Sephadex G-75 gel filtration chromatography. The molecular mass of AN-1 was estimated to be 47.5 kDa utilizing SDS-PAGE and gel chromatography analysis. AN-1 could hydrolyze caboxymethylcellulose, avicel and β-glucan, but not cellobiose, xylan and p-Nitrophenyl-β-D-glucopyranoside. The optimal temperature and pH for the β-glucanase activity of AN-1 were determined to be at 30°C and pH 6.0, respectively. AN-1 was stable at acidic solutions of pH 5.0-6.5 and temperatures below 30°C for 1 h. Moreover, the specific activity was enhanced by Ca2+ and Mg2+, and inhibited by Cu2+. The kinetic parameters Michaelis constant (Km) and maximum velocity (Vmax) of AN-1 were 3.96 mg/mL and 6.06×10-2 mg/(min·mL), respectively.