Dynamical properties of a centrifugally driven outflow from a disc near a black hole

The inclination of the field lines at the surface of the disc plays a crucial role on the nature of the magnetically driven flows. For the non-relativistic case, a centrifugally driven outflow of matter from the disc is possible, if the poloidal component of the magnetic field makes an angle of less than a critical 60° with the disc surface (Blandford and Payne 1982). We investigate the dynamical properties of the magnetically driven flows from the disc near a non-rotating black hole and find that the critical angle becomes larger than 60° when the flows start from the region near the black hole.     

长江三角洲地区门户功能演化与驱动机理

采用综合指数评价、基尼系数、标准差椭圆等方法分析了2004~2014年长江三角洲地区门户功能的空间格局及其演化过程。结果表明：① 长江三角洲地区城市门户功能上升趋势明显,空间上由“一极三强”的格局演变为“一极四强”;② 各类门户功能的空间差异整体上呈缩小趋势,其中国际门户功能的差异明显大于综合和国内门户功能,而组间差异是导致门户功能差异的主要原因;③ 所有门户功能均由南-北方向分布向东-西方向分布转型。长三角地区门户功能的演化是由多重因素驱动形成的,国内和国际门户功能的驱动机理存在明显差异。     

秦皇岛南李庄泻湖的形成与环境变化

三个钻孔的岩心表明,南李庄泻湖沉积可分为5层,最大厚度15m左右。根据孢粉、微量元素以及岩相特点可将泻湖的演化分为5个阶段。资料表明,湖水变深时期是气候温湿时期,湖水变浅时期为气候凉干时期,指示泻湖的兴衰明显受气候控制。     

Application of a step-by-step fingerprinting identification method on a spilled oil accident in the Bohai Sea area

In recent years, oil spill accidents occur frequently in the marine area of China. Finding out the spilled oil source is a key step in the relevant investigation. In this paper, a step-by-step fingerprinting identification method was used in a spilled oil accident in the Bohai Sea in 2002. Advanced chemical fingerprinting and data interpretation techniques were used to characterize the chemical composition and determine the possible sources of two spilled oil samples. The original gas chromatography -flame ionization detection (GC-FID) chromatogram of saturated hydrocarbons was compared. The gas chromatography-mass spectrometry (GC/MS) chromatograms of aromatic hydrocarbons terpane and sterane, n-alkane and poly-aromatic hydrocarbons (PAHs) were analyzed. The correlation analysis on diagnostic ratios was performed with Student’s t-test. It is found that the oil fingerprinting of the spilled oil (designated as sz1) from the polluted sand beach was identical with the suspected oil (designated as ky1) from a nearby crude oil refinery factory. They both showed the fingerprinting character of mixed oil. The oil fingerprinting of the spilled oil (designated as ms1) collected from the port was significantly different from oil ky1 and oil sz1 and was with a lubricating oil fingerprint character. The identification result not only gave support for the spilled oil investigation, but also served as an example for studying spilled oil accidents.     

蒙古裸腹溞染色体组型研究

本文对驯养于实验室自然海水中的蒙古裸腹溞（Ｍｏｉｎａ ｍｏｎｇｏｌｉｃａＤａｄａｙ）染色体进行了分析、研究。结果表明：蒙古裸腹溞染色体数目为ｎ＝１２, ２ｎ＝２４。其中１０条为中部着丝点染色体,２条为亚中部着丝点染色体,１２条为端部着丝点染色体,总臂数ＮＦ＝３６。其核型公式为２Ｎ＝１０Ｍ＋２ＳＭ＋１２Ｔ。本文还与溞属（Ｄａｐｈｎｉａ）６个种类的染色体形态进行了比较,并对蒙古裸腹溞孤雌生殖与两性生殖及性转化的问题开展了讨论。     

龙门山陆内复合造山带的四维结构构造特征

位于扬子陆块和松潘陆块过渡带上的龙门山造山带,是在印支期中国大陆主体拼合和秦岭造山带形成过程中开始发育、燕山期陆内构造活动中继承发展、喜马拉雅期印-亚碰撞和青藏高原隆升过程中遭受改造并定型的。现今构造面貌是扬子陆块向北漂移过程中产生的北西向推挤力、源自秦岭造山带的南北向推挤力和源自青藏高原的东西向推挤力三者联合作用的结果,因此是一个典型的陆内复合造山带。其陆内复合结构构造特征具有下列特点。 1）倾向上,龙门山造山带由茂县-汶川断裂、北川-映秀断裂、安县-灌县断裂和广元-大邑（隐伏）断裂4条主干断裂分隔显示出明显的分带变形特征,由北西向南东具有层次渐浅、强度递减、卷入层位变新的趋势,总体上呈前展式扩展。 2）走向上,龙门山造山带呈现北、中、南段三分格局,它们在基底性质及展布、地层发育及演化历史、变形特征、沉降与隆升特征、活动构造等多个方面具有差异。 3）垂向上,龙门山造山带发育多层次滑脱构造,最重要的滑脱界面是15～20 km深处的低速层和中下三叠统富膏盐岩层,由此控制了深浅构造不一致的变形幅度和变形样式。 4）时间演化上,龙门山造山带表现出倾向上的前展式扩展和走向上的分段式递进性或序次性演化的趋势：印支期,龙门山中北段活动较强,由北东向南西逐渐扩展,主要为挤压逆冲和左旋走滑作用; 燕山期,构造活动总体上趋于相对平静,具有南北分段、由北东向南西迁移的特征; 喜马拉雅山期,龙门山中南段活动较强,由南西向北东逐渐扩展和递进,主要为挤压逆冲、隆升和右旋走滑作用。     

一种测定望远镜极轴偏差的方法

利用望远镜的恒动跟踪，对两颗恒星进行无斗星曝光０．５小时，扣除蒙气差影响，用球面三角方法计算出望远镜极轴指向的偏差在赤经和赤纬方向上的分量，据此对望远镜极轴进行调整，就可以方便地把望远镜极轴指向调整到较高精度。     

The Sources and Transport Patterns of Modern Sediments in Hangzhou Bay: Evidence from Clay Minerals

Clay mineral compositions of 199 offshore surface sediment samples collected from the Hangzhou Bay have been analyzed. The clay minerals in the sediments from the Hangzhou Bay are dominated by illite(58.7%, on average), followed by chlorite(20.3%), kaolinite(16.9%) and smectite(4.1%). Two provinces were classified by Q-mode cluster analysis. Class Ⅰ with relatively low amounts of illite and smectite is widely distributed in the Hangzhou Bay, especially concentrated in the top and mouth of the bay, and the northern and southern nearshore areas. Class Ⅱ with comparatively high amounts of illite and smectite is mainly concentrated in the central part of the bay with the water depth of 8–10 m. By comparing clay mineral compositions with the neighbouring regions, we can find that the sediments in the Hangzhou Bay are mainly influenced by the resuspension and repeated deposition of particles from the Yangtze River due to the strong dynamic environment. In particular, the clay fraction of Class Ⅰ is mainly supplied by the Yangtze River, while the sediments of Class Ⅱ are mixture of the clay minerals carried by the Yangtze River and Qiantang River. In general, the distributions of clay minerals in the northern bay are affected by Yangtze River runoff, coastal current and flood tide together, and in the southern they are mainly affected by the Qiantang River runoff and ebb tide.     

全人工配合饵料投喂越冬亲虾试验

通过两年度的小试和生产性试验,从越冬亲虾入池至产卵过程全部投喂人工配合饵料,其成活率和性腺发育要好于投沙蚕、四角蛤的鲜活饵料组(对照组),生产性试验的产卵量、孵化率和幼体变态率优于对照组。试验用饵的成本比对照组低45.3％。