基于场地响应和量规函数对唐山5.1级地震的震级校正

利用2010年以来河北省测震台网记录到的654个M_L≥2.5地震波形数据,使用Moya方法联合反演计算震源谱及各台站场地响应。河北省测震台网实时接收168个台站数据,最终反演得到151个测震台站场地响应结果。结果显示,频率1～20Hz内各台站均存在不同程度的场地放大效应,随着频率的变化,各类基岩台的场地响应变化较为复杂。位于第四系沉积类的台站场地响应在低频段1～8Hz内放大效应显著,在高频段8～20Hz内呈现快速衰减趋势。选取2017年以来河北省测震台网记录的M_L≥2.0地震数据,对各台站单台震级与台网平均震级进行对比统计、分析,最终得出代表河北地区的地方性震级M_L新量规函数。针对2020年7月12日河北唐山5.1级地震,利用本文得到的台站场地响应结果对震级偏大且有放大作用的台站进行放大作用消除,再分别用现用地方性震级M_L量规函数和河北地区地方性震级M_L新量规函数对单台震级进行重新计算,结果显示震级偏差均有所减小。     

Diurnal changes in bacterial communities in oxic surface and hypoxic middle seawater layers of the Changjiang River Estuary

The Changjiang River Estuary(CRE) in the East China Sea suffers from seasonal hypoxia in summer. The vertical distributions and seasonal changes of microbial communities in the CRE were well documented. However, little is known about the diurnal changes of bacterial communities in the hypoxic zone of the CRE. Here, 16 S rRNA gene analysis was used to explore the changes of bacterial communities in the oxic surface and hypoxic middle seawater layers during 24 h in the CRE. Significant differences between the hypoxic and oxic layers were observed:the phyla Cyanobacteria, Bacteroidetes and Acidimicrobiia were enriched in the oxic layer, whereas the phylum SAR406 and the class Deltaproteobacteria were more abundant in the hypoxic layer. In addition, some subtle diurnal variations of the bacterial relative abundance were found in both two layers. The relative abundance of Synechococcus increased at night, and this change was more obvious in the hypoxic layer. The similar trend was also found in some phototrophic and several heterotrophic bacteria, such as Rhodobacteraceae, OM60 and Flavobacteriaceae. Their relative abundances peaked at 16:00 in the oxic layer, while the relative abundances peaked at around 7:00 and decreased until 13:00 in the hypoxic layer. Together, the results of the present study suggest that some photosynthetic bacteria and several heterotrophic bacteria have similar diurnal variations implying the light and physicochemical heterogeneity in the course of a day are important for bacterial diurnal changes in the CRE.     

三峡库区万州至巫山段城镇地质灾害调查进展

三峡库区作为"全国地质灾害防治十三五规划"重点防治区之一,地质灾害问题突出,其中万州至巫山段更是区内地质灾害集中发育区,地质灾害点数量达5 000余处.以"查背景、识灾害、评风险、研预测"为主线,通过2019年项目工作,在区域地质灾害孕灾背景条件认识和机理研究、城镇地质灾害风险评价等方面取得了新的认识:一是从地质材料特...     

PRT交通模式在山地的应用

基于型钢HZ200X100悬挂轨道及自主转向道岔的悬挂PRT(Personal Rapid Transit)实验研究和基于悬挂PRT的山地交通模式与基于汽车的山区道路交通模式比较研究表明,在山地应用悬挂PRT具有安全隐患少、全天候全季节、建设与维护成本低、节地、节能、不破坏山形地貌、环保的优势;提出了基于悬挂PRT山地交通模式的山地居住、山地观光旅游的基本设想.认为基于悬挂PRT的山地交通模式使山地交通选线更自由、到达范围更广泛、交通保障更可靠,为破解传统山地交通的安全、环保、经济困境提供新方向.     

牙鲆选育F3代家系的建立及遗传效应分析

牙鲆是太平洋西岸海水养殖、捕捞和自然增殖的主要鱼类,但是人工养殖病害多、生长慢,针对这一问题,从2003年开始开展了牙鲆选择育种。本文利用筛选和培育的F1、F2代牙鲆家系核心群体,构建了F3代家系52个,在生长到196d时,对家系1 560尾鱼苗全长、体宽、体质量、全长日增量和体重日增量5个生长性状进行测量和计算,获得7 800个数据。采用"加性-显性"线性模型、最小范数二阶无偏估计法(MINQUE)对以上生长性状的边际平均值、加性方差分量、显性方差分量、随机方差分量、狭义遗传力、广义遗传力、亲本加性效应、杂交随机效应等遗传参数进行了评估。结果显示:1202、1206、1226和1211家系以上生长性状的边际平均值同时显著高于其他家系。以上5个生长性状的加性方差分量比率为(0.099±0.01)~(0.24±0.02),显性方差分量比率(0.30±0.02)~(0.31±0.02),随机方差分量比率(0.48±0.02)~(0.61±0.01),5个性状狭义遗传力0.099~0.24,广义遗传力0.38~0.54,以上遗传参数均达极显著性水平(P0.01)。综合比较18个亲本5个性状的加性效应预测值,发现F0917、F0908、F0905、F0915、F09125和KS(韩国牙鲆)亲本在5个性状上都具有极显著的正向效应(P0.01),其他亲本5个性状都不同程度的表现为显著(P0.05)或极显著(P0.01)的负向加性效应。对42个杂交组合显性随机效应进行预测,D(2×6)、D(2×18)、D(3×4)、D(7×12)、D(7×14)和D(8×13)6个杂交组合在5个性状上都表现为极显著(P0.05)正效应,利用这些杂交组合建立家系将促进牙鲆以上5个性状的生长。本文研究结果,为牙鲆优良家系的建立及新品种的培育初步筛选出了性状优良的亲本、杂交组合和家系,同时为牙鲆进一步选择育种提供了理论和技术依据。     

Treatment of Cr(VI) contaminated water with Pannonibacter phragmitetus BB

Pannonibacter phragmitetus BB was utilized to treat hexavalent chromium [Cr(VI)] contaminated water. Cr(VI) concentration of the contaminated water (pH 10.85) was 534 mg/L. With the inoculum size ranging from 1 to 20 %, P. phragmitetus BB completely reduced Cr(VI) within 27 h when the initial medium concentration exceeded 20 g/L. The lag time of bio-reduction by Cr(VI)-induced cells was 24 h, which was longer than the non-Cr(VI)-induced cells. Under the agitation condition, an obvious bio-reduction lag phase existed and Cr(VI) was completely reduced within 24 h. However, the lag phase was not observed under the static condition, Cr(VI) was reduced continuously after inoculation and Cr(VI) was completely reduced after 27 h incubation. The main chromium components after Cr(VI) reduction were Cr(OH)₃, Cr₂O₃ and CrCl₃. The results of this study are fundamentally significant to the application of P. phragmitetus BB in the treatment of Cr(VI) contaminated water.     

老旧小区不动产登记历史遗留问题研究

随着不动产统一登记工作的开展,各地不动产登记历史疑难问题日益显现,特别是老旧小区的不动产登记历史遗留问题,不仅给群众带来了极大不便,也给不动产登记工作带来了很大困扰,在一定程度上影响了社会稳定,制约了社会经济的发展。因此,为妥善化解矛盾和问题、保护群众合法权益、维护社会和谐稳定、促进社会经济高质量发展,加强对老旧小区不动产登记历史遗留问题的研究力度,显得尤为重要。本文通过对菏泽市区存在不动产登记历史遗留问题的老旧小区进行走访调研,查找问题、剖析原因,针对性提出了一些对策建议,以期为各地妥善化解老旧小区不动产登记历史遗留问题提供参考。     

A Radiative Pumping Scheme for OH and H<Subscript>2</Subscript>O Masers in Massive Star Forming Regions

Interstellar H₂O and OH masers associated with massive star-forming regions can be classified into three morphological types: isolated H₂O masers; isolated OH masers; and spatially overlapping OH/H₂O maser groups. In a large sample of star-forming regions the total number of maser groups of each type is approximately equal. In order to account for these statistics we propose a pumping scheme based on a broadband radiative pump which produces inverted populations of both OH and H₂O masers by a process involving predissociation and dissociation of H₂O. This scheme overcomes some drawbacks of earlier radiative pumping models, and may account for the association of OH and H₂O masers in massive star forming regions.     

3,5-二溴-4-偶氮变色酸苯基荧光酮与铝显色反应及应用

研究了在阳离子表面活性剂ＣＴＭＡＢ存在下，Ａｌ（Ⅲ）与３，５＿二溴＿４＿偶氮变色酸苯基荧光酮（ＤＢＡＣＰＦ）的显色反应条件和光度性质。在ｐＨ６０的ＨＡｃ＿ＮａＡｃ缓冲介质中，Ａｌ（Ⅲ）与试剂形成１∶２的红色配合物，最大吸收峰位于５６０ｎｍ处，表观摩尔吸光系数为１２５×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ａｌ（Ⅲ）的质量浓度为０～０２ｍｇ／Ｌ时符合比尔定律。拟定方法用于铝黄铜及石灰石样品中铝的测定，结果与标准值相符。     

河北地区Pb震相识别及康拉德界面分析

基于河北测震台网现用速度模型,利用走时方程计算得到河北地区Pb震相的盲区范围大致为70km左右,作为初至震相的起始震中距范围为90~120km,作为后续震相的起始震中距范围为135~150km;收集近年京津冀地区2.0级以上地震88条,根据Pb震相理论波形特征,以及理论波形与实际波形到时比对,最终识别到158个有效Pb震相,拟合速度为6.69km/s,康拉德界面埋深21km,并得到河北地区Pb震相实际波形特征,弥补了河北台网Pb震相空白;利用Pb震相的射线分布,分析认为康拉德界面在河北北部山区发育程度较好,南部次之,中部渤海湾盆地地区连续性最差。