Based on a comprehensive analysis of borehole and structural features, the authors interpreted 2D seismic data in East Tarim and 3D seismic data in Central Tarim area. Under the layer of Sinian, a sag-depression dual structure intracontinental rift was identified. The rift zone consists of 4 east-west sags, and its plane distribution is consistent with the hige aeromagnetic anomaly zone. The structural and stratigraphic analysis shows that there are bimodal volcanic rock in a typical intracontinental syn-rift sags, and it is the direct reflection of the high aeromagnetic anomaly; the boundary faults of 4 sags are consistent with axial trace of high aeromagnetic anomaly zone, from which it can be inferred that the anomaly source has a vertical downward channel, and it relates to basement faults and upwelling of hypomagma. Further research involving calculation of the magnetic anomaly confirmed the Nanhua rift zone model. The east segment of high aeromagnetic anomaly zone is formed by rift zone, while it weakened until disappears to the middle and west; high aeromagnetic anomaly in Bachu segment is mainly caused by Permian basalt and the west segment belongs to North Tarim landmass.

In response to the inadequacies of current graph compression methods, such as higher time complexity, dependence on experiences to set parameters, too many parameters to adjust, compression loss, ignoring the community structure of network, a social network compression method is proposed based on the importance of the community nodes. The method include community discovery algorithm (GS) based on greedy strategy and social network compression algorithm (SNC). Adopting topological potential theory GS algorithm is not only capable of discovering communities but also capable of mining important nodes in the communities. SNC algorithm takes communities as targets, achieves lossless compression while maintaining the connections between communities, and keeps important nodes in communities or basic community structure if necessary. The feasibility and effectiveness of the method are verified in experiments.

River longitudinal profile can reflect various geomorphic and landform characteristics of its drainage basin. This study is focused on the profile of the 10 mainstreams of the northern Tianshan. SL index(SL) and gradient index (SL/K) are examined for concavity studies of each profile. They are compared with the bedrock distribution, active structures, and geomorphic features to clarify the activity of the northern Tianshan. The results illustrate that, after millions of years of tectonic evolution, the main factor to cause the landform of the drainage basin is tectonic uplifting, instead of what proposed by Davis's graded river theory. The third episode of the Himalayan movement affects the trailing edge of the deformation belt, and the movement at the end of the early Pleistocene leads the southern margin of the Junggar Basin to deform completely. Gradient index increases as each river meeting with the southern margin fault of the Junggar basin in district Ⅱ. Therefore, in a large-scaled view of gradient index, tectonic fault exhibits a strong influence on river profile in the study area. The difference of the lithology and the afflux of the tributaries also make a great influence on gradient index in a subbasin-scaled view.

The observed daily meteorological phenomena and visibility of 84 stations from 1961 to 2004 are used to study the special and temporal character of fog climatology in Guizhou Province Also daily ground and air temperature, relative humidity of 9 selected sample stations are also included The mean annual geographical distribution of fog frequency in Guizhou is randomly The average annual fog frequency is 299 days The stations with more than 60 mean annual fog day frequency scatter in the east, west and central area of Guizhou with relatively high altitude There are 3 stations whose annual fog frequencies exceed 100 days The highest fog frequency of Guizhou is 170 days in Dafang county of Bijie The seasonal and diurnal variations of fog occurrence are obviously Although fog may occur in each season, but most of fog occur in cold season (from October to February) and less from May to July On the diurnal time scale, fog events occur mainly on 0800 of local time The mean annual fog frequency show a decreasing trend with a rate of 006 day per year Further statistical study based on meteorological data show that the decrease of mean fog occurrence might be caused by several climate changed issues: a rising trend of the mean daily lowest temperature in winter, a decreasing trends in the difference between ground and surface air temperature,the annual mean difference between higest and lowest surface air temperature,and the annual mean surface relative humidity

The finite-difference time-domain method is used to calculate the electronic field distribution and enhancement factor of nano-scale optical antennas for different shape, length and substrates. When the resonant wavelength is 915 nm, the antenna with symmetry echelon dipoles has an enhancement factor of 1 739, which is greater than the enhancement factor of 1 076 of the antenna with symmetry rectangle dipoles. The resonant wavelength has a blue-shift when the length of the antenna is decreased. With a glass substrate, the resonant peak of the antenna with a length of the dipole of 80 nm red-shifts from 587?nm to 715 nm and the electric field distribution inclines to the substrate.

The Manas River is the largest stream across rows of active reverse fault and fold in the north margin of Tianshan Mountains. Eight terraces had developed along the Manas River. Based on the field survey, the distribution, the arched deformation and the dislocation of the river terraces have been studied. The deformation characteristics of these river terraces suggest that the piedmont anticline and the Manas fold have been uplifted at all time. The center of the upheaval migrated from south to north in the process. F₁active reverse fault develops in the northern limb of the Manas fold. F₂active reverse fault situates near the core of the Manas fold. The dislocation of river terraces shows that the F₂fault has two periods activity and the F₁fault has four periods activity at least.

Individual risk models' approximation by Compound Poisson approximation is discussed. Three principles are presented, and the optimal choice of Poisson parameters under the three principles is discussed. It is proved that the individual risk model is also a compound binomial model; And formulas on the calculation of the optimal parameters are given. For two distributions, Exponential and Pareto, calculating results are given.

In the lake-face strata located in the lower reach of the Qingshuihe River, Ningxia with the latitude of 37.4° N and the elevation about 1230m, involution dated in late period of late Quaternary was discovered, which indicates that the south limit of permafrost had once expanded approximately to the latitude of 37.4° N in that time in Ningxia and that the annual mean temperature was 8～9℃ lower than today. Because the intensive tectonic uplift in the northeast margin of Tibetan Plateau and cold and dry weather in the last glacial maximum, the Qingshuihe River was so blocked that along the margin of the blocked-lake the involution was developed.

Hexi corridor, located on the northern margin of the Qinghai-Xizang plateau, is one of the most typical regions of compressional tectonic basins in northwest China. Accompanying the uplift of the Qinghai-Xizang plateau since the late Paleogene, the four basins of the corridor began subsiding and accepting deposits. Since then, at least seven tectonic movement stages can be identified. According to the results of absolute dating(includes ESR, TL and IRSL dates) and relative dating(includes rock-weathering rinds and palaeomagnetic stratigraphy) of Cenozoic strata and landforms, the seven movements occurred at about 37.7, 30.3-29.5, 24.5-22.2, 4.66, 2.47-2.23, 1.95-1.48 and 0.80Ma-present, each of them represented by uncomformity and deformation of strata, active folding and faulting, and geomorphic evolution. The first tectonic movement stage took place at the beginning of Oligocene after a long period of erosion and denudation since the late Cretaceous. The forth stage, characterized by the preliminary accumulation of gloomy conglomerate (Yumen formation), is the turning point of Cenozoic tectonic movement as the intensity of tectonic activity became obviously stronger. It is in the latest stage that the main part of modern landform evolved. Some important morphologic units, including piedmont platform, transverse uplifts and northern mountains, generated or strongly deformed and uplifted in the stage. On the other hand, less deform tracks can be found in strata. Further divisions are made in order to avoid that the interval time between two neighbouring movements became shorter and shorter as time passed because latelyformed records preserved better. For example, mainly according to the luminescence ages of river terraces, at least five tectonic substages can be identified during the latest stage. They tarted at about 800, 350, 250, 150 and 40ka respectively. Furthermore, in the tectonic substage started from 150ka, four tectonic events, which took place at 145, 110, 90 and 70ka respectively, can be identified, and in the last substage, three tectonic events(40, 30 and 10ka) can be identified.

Limit distribution of a homogeneous portfolio of n-year term life insurance is discussed. Under the force of interest modeled with white noise process, recursive formula for the density of the limit distribution is got.

Modern insurance science is a composition of insurance theory, economics, mathematics, statistics and computer science. It will take a very important part in the economic development in China. The present article is concerned mainly with the actuarial science in modern insurance. At first, the history and the current situation of insurance are reviewed generally. Then our paper introduces the key parts in the actuarial insurance, including the life actuarial science with survival analysis and thecasualty actuarial science with credibility theory and risk theory. And some hot lines in related fields listed afterward.This part consists of the researching of insurance strategies and insurance techniques in China. Finally the article emphasized the importance of training and bringing up more actuaries for the growing up of Chinese insurance.In our opinion, modern insurance, as an important part of the marketing economy activities, is a compensation method to decrease the uncertain loss and also is a kind of commodity being exchanged in market. Under the condition of fair competition, the statistical computing and analysis of insurance transaction, which have not been worked on for a long time in China, are important foundations for the insurance operation and with powerful competence. There are some basic preparations to do, such as the day-by-day collecting of the insurance transaction data and the modeling of the insurance operation. Under the circumstances, actuary can develop the new types and fields of insured risk, give the financial analysis reports of the portfolios and predict the future financial management. As the actuarial science itself, we are interested in the following subjects: a) Estimating the loss distribution of non-life insurance and designing new kinds of policies; b) Planning the pension system for any kind of company, society and group; c) Using credibility theory to do rate-making in Chinese insurance market; d) Applying the risk theory to evaluate the financial management of insurance companies.

Modern insurance science is a composition of insurance theory, economics, mathematics, statistics and computer science. It will take a very important part in the economic development in China. The present article is concerned mainly with the actuarial science in modern insurance. At first, the history and the current situation of insurance are reviewed generally. Then our paper introduces the key parts in the actuarial insurance, including the life actuarial science with survival analysis and thecasualty actuarial science with credibility theory and risk theory. And some hot lines in related fields listed afterward. This part consists of the researching of insurance strategies and insurance techniques in China. Finally the article emphasized the importance of training and bringing up more actuaries for the growing up of Chinese insurance. In our opinion, modern insurance, as an important part of the marketing economy activities, is a compensation method to decrease the uncertain loss and also is a kind of commodity being exchanged in market. Under the condition of fair competition, the statistical computing and analysis of insurance transaction, which have not been worked on for a long time in China, are important foundations for the insurance operation and with powerful competence. There are some basic preparations to do, such as the day-by-day collecting of the insurance transaction data and the modeling of the insurance operation. Under the circumstances, actuary can develop the new types and fields of insured risk, give the financial analysis reports of the portfolios and predict the future financial management. As the actuarial science itself, we are interested in the following subjects: a) Estimating the loss distribution of non-life insurance and designing new kinds of policies; b) Planning the pension system for any kind of company, society and group; c) Using credibility theory to do rate-making in Chinese insurance market; d) Applying the risk theory to evaluate the financial management of insurance companies.

Based on the filed investigation and data analysis of the tectonics、sediments and landform, the authors has studied a special active tectonic unit developed in the compressional mountain fringe of the Hexi corridor—trumpet asymmetric graben. It looks like a flaring river mouth in plane developed at arcuate mountain fringe in shape, but a asymmetric graben confined by active fractures and developed in the specified tectonic position in fact. This is a representative form of tectonics in the compressional active fractures zone, the Gulang asymmetric graben is one of the them. The paper has approached its developed model.

Let {X, X_i, i≥1} be i.i.d. random variables with non-degenerate d.f.F, and |X⁽¹⁾_n|≥|X⁽²⁾_n|≥...≥|X⁽ⁿ⁾_n| be the order statistics of |X₁|, |X₂|,...，|X_n|. For r_n→+∞，and r_n/n→0 as n→+∞, write ^(r_n)S_n=∑ⁿ_i=rn+1X⁽ⁱ⁾_n. This article gets the sufficient and necessary condition for ^(r_n)S_n convcrgcs to normal in distribution.

The Heihekou fault, being apart 30 km from Zhangye in the southwest, is a reversed fault which trends to the northwest and dips to the southwest. It is found that the fault on a natural section along the bank of the Heihe River dips steeply to the southwest, and that the Ordovician system thrusts to the northe-ast on the Late Pleistocene alluviam with a throw of 17m. A fault scarp was formed in the fault movement on terraces of the Heihe River. The terrace withan estimated age of 5 ka B.P. is vertically dislocated by 2m, age of 10 ka B.P. by 4m, and age of 13 ka B.P. by 9m. These dislocations and the sediments near the fault indicate there had been 3 movement enents at least. The vertical dislocationis 2～5 m each, the average recurrence interval is 3～5 ka, and the average slip rate is 1.67～0.4 mm/a.