随机微分方程的稳定性理论:方法概述

从所应用的主要方法出发,回顾了随机连续系统的各种稳定性理论结果,并探讨了这些稳定性之间的关系.     

贵州织金洞世界地质公园喀斯特成景机制及模式研究

本文将织金喀斯特分为8大类:洞穴、峡谷、天生桥、天坑、高峰丛、丘陵、单面山与象形山、水文遗迹等,它们以下三叠统海相碳酸盐岩为物质基础,有序、集中分布于织金洞、绮结河、东风湖三片相对独立,却又以绮结河为纽带紧密相连的喀斯特区域内,共同构成一个以洞穴、峡谷、天生桥、天坑为核心,形态雄伟、典型、优美、珍稀的高原喀斯特景观群。同时在对公园区域成景背景进行分析和研究的基础上,认为织金喀斯特的形成演化,始于古近纪,以三处喀斯特区域相互之间水力联系的演变为主轴,历经四个阶段:初始阶段(古近纪期间,喀斯特地层出露)→雏形阶段(分轴型离散岛屿式成景过程)→重要发育阶段(主轴型离散岛屿式与集合型岛屿式成景过程)→现代喀斯特阶段。期间,三个喀斯特区域产生不同的喀斯特响应过程:(1)织金洞区域,以织金洞地下河的演变为主轴,历经横向裂隙式岩溶水→地下河道→抬升形成化石洞穴/洞穴景观发育阶段/袭夺地表河(古新寨河)→地下河大规模发育→抬升形成化石洞穴/被袭夺阶段/→地下河小规模发育/洞穴景观发育等不同的地下岩溶循环发育阶段,形成了规模宏大的4层迷宫式化石洞穴系统—织金洞洞穴系统,洞内次生化学沉积物类型齐全,形态优美、独特,体量巨大,现代总体属于已停止发育的化石型洞穴喀斯特区域。(2)绮结河区域,以绮结河的演变为主轴,历经地表流水各向分散流动阶段→地表河阶段→地下河阶段→地下河改道/袭夺阶段→地下河大规模发育阶段→改道/明流与伏流交替阶段等不同的地表与地下岩溶交替循环发育阶段,峰丛、洞穴、峡谷、天坑、天生桥等地貌有序分布于河谷上或其两侧,协同共生,现代总体属于地表与地下喀斯特正在相互交替发育的区域。(3)东风湖区域,以六冲河的演变为主轴,历经持续、漫长、大规模、高强度的横向—纵向侵蚀、切割,峰丛、丘陵、象形山、单面山、峡谷有序分布于其上宽下窄的河谷上或其两侧,共生发育,现代总体属于正在发育的地表喀斯特区域。(4)整个公园,以三处喀斯特区域相互之间水力联系的演变为主轴,历经四个不同的喀斯特阶段,及各区域不同的喀斯特响应过程,形成独特的织金高原喀斯特景观群,现代总体上正在分区进行着三种不同的喀斯特过程。在上述分析的基础上,提出分轴型、主轴型、离散型和集合型等四种岛屿式成景机制。同时,通过与相似、典型岩溶区域(如广西乐业、重庆武隆等)的成景模式进行对比,将织金喀斯特成景模式归纳为"相邻岛屿式成景模式"。     

广西凤山岩溶国家地质公园典型地质遗迹景观价值

广西凤山岩溶国家地质公园是我国西南喀斯特旅游资源的富集带,岩溶遗迹景观种类多、规模宏大、特色鲜明。园区内的岩溶洞穴、天生桥、天坑和天窗等4类典型地质遗迹景观与国内外同类景观对比,洞穴通道规模世界最大、巨型洞穴厅堂数量多、密度大;形态巨大、景观奇特的地下河三门海天窗、以高大石笋为代表的洞穴沉积物世界罕见,世界上最大的洞内天生桥,均具有很高的美学观赏价值和科学价值,地质遗迹景观资源的典型性、稀有性、自然性均在同类地质遗迹中名列前茅。     

Distribution and expression in vitro and in vivo of DNA vaccine against lymphocystis disease virus in Japanese flounder(Paralichthys olivaceus)

Lymphocystis disease,caused by the lymphocystis disease virus (LCDV),is a significant worldwide problem in fish industry causing substantial economic losses.In this study,we aimed to develop the DNA vaccine against LCDV,using DNA vaccination technology.We evaluated plasmid pEGFP-N2-LCDV1.3 kb as a DNA vaccine candidate.The plasmid DNA was transiently expressed after liposome transfection into the eukaryotic COS 7 cell line.The distribution and expression of the DNA vaccine (pEGFP-N2-LCDV1.3kb) were also ana...     

加强和完善气象部门目标考核亟待解决的问题

根据气象部门目标管理工作的实际和特点,围绕目标考核这一重要环节,提出了目标考核应当遵循的目标性、客观性、激励性、差异性和协同性原则,阐明了气象部门考核者和被考核者的职责,同时指出了加强考核工作连续性、增强考评内容多样性和实现考核内容科学量化的现实意义。     

RESPONSE OF TRIASSIC SEQUENCE STRATIGRAPHY OF LOWER YANGTZE TO THE COLLISION BETWEEN THE YANGTZE PLATE AND THE NORTH CHINA PLATE

The characteristics of the Triassic sequences developed in the Lower Yangtze area display some great changes in both environment and climate. The change of environment was a transition from marine to continent via alternating environments. The change of climate was a transition from tropic （torrid） to warm and wet climate via subtropic dry climate. The type variations of the sequences were from the marine sequences to the continental sequences, corresponding to the changes of environments and climates. Sequence 1 is a type II of sequence of mixed elastic and carbonate sediments; sequence 2 is a type I of sequence of carbonate platform; sequence 3 is a type I of sequence of carbonate tidal flat-salt lagoon, sequence 4 is a type iI of sequence of lacustrine within marine layers, and sequence 5 is a sequence of lacustrine-swamp. The development, distribution and preservation of those sequences reveal the tectonic controls and their changes in the background. The collision between the Yangtze plate and the North China plate was a great geological event in the geological history, but the timing of the collision is still disputed. However, the characteristics of Triassic sequence stratigraphy and sea level changes in the Lower Yangtze area responded to this collision. The collision started at the beginning of middle Triassic and the great regression in the Lower Yangtze area started 22Ma earlier than those in the world. The tectonic conditions occurred before and during the collision controlled the development of sequences and type changes.