匈奴政权左贤王若干问题探析

公元前3世纪,匈奴在我国北方草原建立起第一个庞大的游牧民族政权,其统治体制的基本框架是以单于庭为中心,左右贤王、左右谷蠡王为地方"四大国"。单于是最高统治者,单于之下,左贤王是地位最尊贵、权力最高的职官。目前,学界对左贤王的研究还缺乏系统性,而对匈奴左贤王的系统研究,可以从一个侧面比较深入地了解匈奴政权的体制,揭示其在匈奴的单于位继承、经济生活、政治和军事等活动中的地位、作用和影响。

匈奴政权右贤王制度探析

右贤王是匈奴政权中的一个职官,是其最大的地方行政、军事机构——四大国之一的封王。就右贤王的继承制、地位、权力及主要组织机构、驻牧地区的变化等问题进行初步的梳理和探讨,可以对右贤王制度有一个比较全面的了解和认识。从匈奴政权建立始,右贤王的线索可以延至魏晋时期。

Evapotranspiration and humidity variations in response to land cover conversions in the Three Gorges Reservoir Region

A new land cover classification system was established for the Three Gorges Reservoir Region(TGRR) after considering the continuity of inundation and the natural characteristics of land cover. The potential evapotranspiration(PET) was predicted using a modified Penman-Monteith(P-M) model. The region's ratio of precipitation to evapotranspiration was calculated as the humidity index(HI). The data obtained was used to analyze climatic responses to land cover conversions from the perspectives of evapotranspiration and humidity variations. The results show that, from 1997 to 2009, the average annual PET increased in the early years and decreased later. In terms of overall spatial distribution, a significant reciprocal relationship appeared between annual PET and annual HI. In 1997,the annual PET was higher in the lower reaches than in the upper reaches of the TGRR, but the areas with high PET shifted substantially westward by 2003. The annual PET continued to increase in 2006, but the areas with high PET shrank by 2009. In contrast, the annual HI showed varying degrees of localized spatial variability. Over the three periods, the dominantforms of land cover conversions occurred from evergreen cover to seasonal green cover, from seasonal green cover to evergreen cover, and from seasonal green cover to seasonally inundated areas, respectively. These accounted for 48.0%, 38.4%, and 23.8% of the total areas of converted land covers in the three periods, respectively. During the period between 1997 and 2003, the main forms of land cover conversions resulted in both positive and negative growths in the average annual PET, while all of them pushed down the average annual HI. From 2003 to 2006, the reservoir region experienced neither a decrease in the annual PET nor an increase in the annual HI. The period between 2006 and 2009 saw a consistent downward trend in the annual PET and a consistent upward trend in the annual HI.

Comparative Data of Millipedes＇ Distribution in Southern Region of Albania

This is a study about the zoographical and taxonomy aspects of Diplopoda class in Albania. Based on the published studies of foreign and Albanian researchers, we have analyzed the current level of information about the distribution of this class in Albania. In this study we mainly focused in the Southern Region of Albania by assessing the biodiversity of the diplopods. The study area covers the Ionian coast and parts of Vjosa river valley. This study has made use of determination key of Mauries J. color, number of segments, number of paired limbs to distinguish the different species. The collected data are compared with previous findings by Verhoeff （1901）, Attems （1929）, Manfredi （1945）, Mauriès, Go lovatch, Stoev （1997） etc. The distribution range of the collected species is presented according to the national or Balkan level. Based on the recent studies and the geographical distribution of diplopods, we expect to find approximately 150 species of 50 genres in Albania.

A New Upsurge in Global Seismicity

This paper studies the temporal and spatial distribution of great global earthquakes （Mw i〉 8.0） since 1900. We compare the two periods of upsurges of great earthquakes occurring in the middle of last century and beginning of this century. The former period took place between 1950 and 1965 during which 13 great earthquakes （Mw I〉 8.0） occurred, including three events with moment magnitude greater than 9. 0. The largest magnitude in this period reached 9.6. The latter period starts from the beginning of this century. In less than 12 years, 15 great earthquakes have attacked the world with the largest magnitude being Mw 9. 1. On the basis of comparison between these two upsurges of global earthquake activity, we infer that the ongoing high level of earthquake activity may continue for another five years or so. Numerous great earthquakes （Mw I〉8. 0） and many large earthquakes （Mw6.0 ~ 7. 0） will occur globally in these five years. In addition, this paper also discusses the relationships between earthquake activity along the Sumatra segment of the Indian-Australia plate boundary and that in the Bayankala block in the middle of Qinghai-Tibetan plateau as well as in the blocks of the southern plateau. The results indicate that the Qinghai-Tibetan plateau, in particular its middle and southern parts, is a likely place for future earthquakes of magnitude over 7.0.

Sources and distribution of polycyclic aromatic hydrocarbons of different glaciers over the Tibetan Plateau

Twenty snow samples were collected from the Qiyi glacier in Qilian Mountains,the Yuzhufeng glacier in eastern Kunlun Mountains,the Xiaodongkemadi glacier in Tanggula Mountains,and the Gurenhekou glacier in Nyainqêntanglha Range over the Tibetan Plateau.The concentration and distribution features of sixteen priority Polycyclic Aromatic Hydrocarbons (PAHs) were determined by gas chromatography equipped with a mass spectrometry detector (GC-MS).The sources of these PAHs were explored as well.Our results indicated that the average concentrations of PAHs in snow were in the range of 20.45 60.57 ng/L.Maximum PAHs levels were found in the YZF glacier andminimum in the XDKMD glacier.However,no apparent regional distribution pattern of PAHs was found in the glaciers over the Tibetan Plateau.Moreover,the 2 4 ring low molecular weight PAHs predominated in snow samples and the concentrations of phenanthrene was the highest.Integrated factor analysis and isomer pair ratios suggested that PAHs of glaciers over the Tibetan Plateau were derived from low temperature combustion of coal and biomass,and partially from the exhaust gas of locomotives.Air mass back trajectory indicated that organic compounds detected in snowpit of these four glaciers,in the period of time they represented,mainly came from Central Asia and the arid area of Northwest China by westerly wind circulation.