Eocene volcanism and the origin of horizon a

A series of closely time-equivalent deposits that correlate with seismic reflector horizon A exists along the coast of eastern North America. These sediments of Late-Early to Early-Middle Eocene age contain an authigenic mineral suite indicative of the alteration of volcanic glass. A volcanic origin for these siliceous deposits onshore is consistent with a volcanic origin for the cherts of horizon A offshore.     

“源”园设计理念在现代墓园中的应用探讨

墓园是埋葬死者以及供生者表达怀念和追思的去处,是人类生活的必要组成部分,是城市绿地系统的重要组成部分。根据现代墓园的具体特点和发展方向,提出了以“源”园理念指导现代墓园规划设计的构想,并对何为“源”“源”园的功能和“源”园的主题等内容进行解析。同时,结合案例研究,以“源”园设计理念,通过“源”园结合,以“源”写园,从空间结构、葬式葬法、绿化种植和建筑小品等方面对安徽亳州云都墓园进行规划设计,并对中国今后如何提升现代墓园规划设计水平进行了归纳总结。图1参15     

农业信息化“最后一公里”和“最初一公里”问题研究

通过翻阅大量与农业信息化“最后一公里”和“最初一公里”问题相关的文献资料,整理了该问题的由来、对该问题的已有观点,最后给出了笔者对于该问题的看法:该问题是对农业信息化没能达到预期效果的一种表述,而这种表述以及对表述的解读却能够影响看待该问题的视角及解决该问题的思路.     

The life and death of "Bare" viscous bubbles

Air bubbles collect and explode at the surface of many viscous liquids, as observed with polymer foams, in glass furnaces, and during volcanic eruptions. The liquid film separating the bubble from bulk air can have a long lifetime (if it is viscous) even if it is not protected by a surfactant. These "bare" films display unusual dynamic behaviors in drainage and rupture. Two different model systems were studied: a polymer melt (silicone oil) and a molten (borosilicate) glass of comparable viscosity. Although the two systems differ greatly in their relaxation time, they are described by the same set of laws, which can be understood from a relatively simple hydrodynamic model.     

史诗《摆手歌》的民族学价值 --土家"摆手"研究之一

土家著名史诗<摆手歌>具有多方面的社会价值.根据族源、迁徒、民族英雄以及"蛮夷"文化之荟萃的探索,论述其民族学价值.     

Volcanism on Mercury: evidence from the first MESSENGER flyby

The origin of plains on Mercury, whether by volcanic flooding or impact ejecta ponding, has been controversial since the Mariner 10 flybys (1974-75). High-resolution images (down to 150 meters per pixel) obtained during the first MESSENGER flyby show evidence for volcanic vents around the Caloris basin inner margin and demonstrate that plains were emplaced sequentially inside and adjacent to numerous large impact craters, to thicknesses in excess of several kilometers. Radial graben and a floor-fractured crater may indicate intrusive activity. These observations, coupled with additional evidence from color images and impact crater size-frequency distributions, support a volcanic origin for several regions of plains and substantiate the important role of volcanism in the geological history of Mercury.     

The persistently variable "background" stratospheric aerosol layer and global climate change

Recent measurements demonstrate that the "background" stratospheric aerosol layer is persistently variable rather than constant, even in the absence of major volcanic eruptions. Several independent data sets show that stratospheric aerosols have increased in abundance since 2000. Near-global satellite aerosol data imply a negative radiative forcing due to stratospheric aerosol changes over this period of about -0.1 watt per square meter, reducing the recent global warming that would otherwise have occurred. Observations from earlier periods are limited but suggest an additional negative radiative forcing of about -0.1 watt per square meter from 1960 to 1990. Climate model projections neglecting these changes would continue to overestimate the radiative forcing and global warming in coming decades if these aerosols remain present at current values or increase.     

“八景”文化对现代园林设计的影响

通过介绍"八景"文化的起源与发展,挖掘"八景"自身存在却又被忽视的文化底蕴及特点,总结了"八景"在体现地域文化特色中对现代园林的影响,指出了重新审视"八景"文化对我国现代园林景观发展的实际意义。     

Gravity and Magnetic Anomalies of the Sierra Madera, Texas, "Dome"

A geophysical traverse across the Sierra Madera "Dome" indicates a negative gravity anomaly of 1(1/2) milligals over the zone of brecciation in the center and a residual positive anomaly of (1/2) milligal associated with a positive magnetic anomaly of 25 x 10(-5) oersted to the southeast of the zone of brecciation. Areal surveys are needed before any definite conclusions can be drawn concerning the origin of Sierra Madera. However, gravity and magnetic data can be extremely valuable in establishing criteria for classifying terrestrial and lunar features according to meteoritic and cryptovolcanic origin.     

黑格尔“有与无”思想及其渊源

有与无思想对于理解黑格尔的整个思想体系是非常重要的。有与无并非黑格尔凭空创造出来的,而是有其悠久的哲学史渊源的。但黑格尔的有与无思想归根到底不过是对于哲学史中有与无思想批判继承的结果。     

滨州市"城中村"的成因及改造途径

城中村的形成有其制度背景、经济原因和组织根源.它的改造必须在明晰产权的基础上,依据城市规划引入市场机制以及在政府的组织协调下充分发挥城中村内外各方面的积极性才能得以实现.     

alpha-Hydroxy and alpha-amino acids under possible Hadean, volcanic origin-of-life conditions

To test the theory of a chemoautotrophic origin of life in a volcanic, hydrothermal setting, we explored mechanisms for the buildup of bio-organic compounds by carbon fixation on catalytic transition metal precipitates. We report the carbon monoxide-dependent formation of carbon-fixation products, including an ordered series of alpha-hydroxy and alpha-amino acids of the general formula R-CHA-COOH (where R is H, CH3,C2H5,orHOCH2 and A is OH or NH2) by carbon fixation at 80 degrees to 120 degrees C, catalyzed by nickel or nickel,iron precipitates with carbonyl, cyano, and methylthio ligands as carbon sources, with or without sulfido ligands. Calcium or magnesium hydroxide was added as a pH buffer. The results narrow the gap between biochemistry and volcanic geochemistry and open a new gateway for the exploration of a volcanic, hydrothermal origin of life.     

“哥德堡”号古茶再现及其意义

介绍了中国茶的远航和友谊之船的由来,回顾了"哥德堡"号远洋商船的沉船打捞与古茶展示,认为"哥德堡"号不仅具有经济价值,更具有政治价值和文化价值。瑞典重建"哥德堡"号并重游海上丝绸之路,对瑞典和中国都意义非凡。借鉴"哥德堡"号的成功经验,中国茶与"一带一路"政策的有机契合必将使古今文明、中外文化激情碰撞并和谐交融。     

Geology of the Caloris basin, Mercury: a view from MESSENGER

The Caloris basin, the youngest known large impact basin on Mercury, is revealed in MESSENGER images to be modified by volcanism and deformation in a manner distinct from that of lunar impact basins. The morphology and spatial distribution of basin materials themselves closely match lunar counterparts. Evidence for a volcanic origin of the basin's interior plains includes embayed craters on the basin floor and diffuse deposits surrounding rimless depressions interpreted to be of pyroclastic origin. Unlike lunar maria, the volcanic plains in Caloris are higher in albedo than surrounding basin materials and lack spectral evidence for ferrous iron-bearing silicates. Tectonic landforms, contractional wrinkle ridges and extensional troughs, have distributions and age relations different from their counterparts in and around lunar basins, indicating a different stress history.     

Styles of volcanism on venus: new arecibo high resolution radar data

Arecibo high-resolution (1.5 to 2 km) radar data of Venus for the area extending from Beta Regio to western Eisila Regio provide strong evidence that the mountains in Beta and Eisila Regiones and plains in and adjacent to Guinevere Planitia are of volcanic origin. Recognized styles of volcanism include large volcanic edifices on the Beta and Eisila rises related to regional structural trends, plains with multiple source vents and a mottled appearance due to the ponding of volcanic flows, and plains with bright features surrounded by extensive quasi-circular radar-dark halos. The high density of volcanic vents in the plains suggests that heat loss by abundant and widely distributed plains volcanism may be more significant than previously recognized. The low density of impact craters greater than 15 km in diameter in this region compared to the average density for the higher northern latitudes suggests that the plains have a younger age.     

Opaline sediments of the southeastern coastal plain and horizon a: biogenic origin

Scanning electron microscope techniques show that Eocene opaline claystones (fuller's earth and buhrstone) of the Atlantic and Gulf Coastal Plain, deposits long considered volcanic in origin, are actually highly altered diatomites formed as transgressive facies in normal marine continental shelf environmnents. These findings are in agreement with a biogenic origin for time-equivalent horizon A and A deep-sea cherts of the North Atlantic and Caribbean.     

农村土地“三权分置”研究综述

近年来,农村土地“三权分置”这一相关研究逐渐受到各界学者的重视,本文旨在更好 的渗透三权分置相关理论,并对其进行宏观的掌握。登录中国知网检索相关关键字,将文章从 检索现状分析;三权分置的起源与发展;三权分置的意义;三权分置的防范机制四个方面进行梳 理,接下来,“三权分置”的相关研究可以更多地从微观个体（如土地流转的交易双方等）、流转意 愿等主观因素、地域发展不平衡等客观因素对“三权分置”的影响这几方面入手。     

Caribbean eocene volcanism and the extent of horizon a

Layer A and its correlative layer A" in the Caribbean have been interpreted as chert layers produced by Eocene volcanism. Exposures of Eocene volcanic rocks in Puerto Rico and the Dominican Republic may represent layer A interbedded with coarser volcanic debris and preserved near early Tertiary volcanic centers.     

Polar wandering on Mars?

Polar wandering during the past 10(8) years may be recorded by unique quasi-circular structures in the polar regions of Mars. Polar wandering on Mars is likely if deep convection is involved in the origin of the very large constructional volcanic features located near the equator. The magnitude of the nonhydrostatic low order components of the gravity field and their correlation with the equatorial volcanic features may be additional evidence of deep convection and associated polar wandering.