40Ar-39Ar ages of the Louzidian-Dachengzi ductile shear zone near Chifeng, Inner Mongolia and their tectonic significance

The Louzidian normal fault occurs as the eastern detachment fault of the Kalaqin metamorphic core complex. Field observations and microstructural analyses reveal that the Louzidian-Dachengzi ductile shear zone developed in its lower-plate was genetically related to sinistral strike-slips and extensional faulting. Two samples from this ductile shear zone yield ⁴⁰Ar-³⁹Ar plateau ages of 133 Ma (Bi) and 126 Ma (Kp), which are concordant with their isochron ages. The plateau age of 133 Ma (Bi) records the formation age of the ductile shear zone. The inconsistent relationship between the earlier strike-slip ductile shear zone and the later normal fault makes the Kalaqin Quasi-metamorphic core complex distinctive from Cordilleran metamorphic core complex. These ages provide important geochronological data for putting constraints on the formation age and genesis of such ductile shear zones.     

Correlation of coral fluorescence with nearshore rainfall and runoff in Hainan Island, South China Sea

Under UV-laser excitation, the Porites coral from Longwan bay waters. Hainan Island, could emit yellow-green fluorescence. After fitting the data of the fluorescent intensity (FI) of the coral with the rainfall (RF) in nearshore area of Qionghai. a good relationship between FI and RF was found with a linear formula of RF = 889 — 4.54 FI and a correlation coefficient of 0.78. Based on this formula, the rainfall sequence from 1982 to 1997 has been reconstructed. The peak annual rainfall is usually related to global El nino events. By fitting the data of the fluorescent intensity and the runoff (RO). a quadric formula was obtained as RO = — 0.0279FI —18.59 FI - 950.9 with a correlation coefficient of 0.74. The reconstructed runoff sequence from 1982 to 1997 coincided with the rainfall occurrence. The results indicate that flood and drought incidents in coastal areas of the south China are affected by global change to a great extent.     

Research situation and progress of non-equilibrium plasma chemistry

Generally, the non-equilibrium plasma is produced at low pressure by a glow discharge (1.33 Pa—1.33 kPa) including the radio frequency (13.56 MHz), microwave (2450 MHz), AC or DC high voltage discharges. As a method to directly apply energy to a reaction system, some successful applications have been obtained in the fields such as chemical synthesis and decomposition at plasma, sputtering and filming, deposition at the gas state, polymerization, modification on the material surface, etching, ashing at low temperature and so on. For example, in 1999, Zhang et al.^[1] got a high conversion rate of 98.2% for CH₄ synthesis by a glow discharge at the condition of 850℃ with the catalyst of Ni/a-Al₂O₃. In 1990, Matsumoto et al.^[2] reduced the concentration of CO₂ from 10% to 8% by DC corona torch discharge with Ar catalyst at 0.08 kPa. In 1988, Boenig et al.^[3] synthesized rare N₂H₄ and H₂O₂ with a glow discharge, in which N₂H₄ is a kind of pureness fuel and propellant of rocket. Tanaka et al.^[4] investigated the synthesis of ammonia from nitrogen-hydrogen plasmas in radiofrequency and microwave discharges with catalysts of iron and molybdenum wires of 100 pieces at 620 K and 650 Pa. After 2-h synthesis, the amounts of synthesized NH₃ and N₂H₄ were only 1.5 mmol/g and 2.5 mol/g, respectively. Because it is only at low pressure that electrons can obtain enough energy to carry out chemical reaction, the vacuum system is necessary, which results in the complicated technology and low production efficiency.......     

Manipulation and cutting of carbon nanotubes

Nanomanipulation plays an important role in nanofabrication, it is also a technology necessary in exploring the secrets of nanoworld, and it thus beco mesa start point to research future nanomachine. In this study, manipulation and cutting of carbon nanotubes have been conducted in order to examine whether we can move a nanocomponent from one site to another by using the tip of atomic fo rce microscope (AFM). The technique may also be valuable for providing the const ructive materials of nanofabrication. While exploring the method for manipulatin g and cutting of nanotubes, some new phenomena have been observed during the process. Results show that carbon nanotubes present a feature of deformation combin ing bending and distortion when subjected to large mechanical forces exerted by the tip of AFM. In special cases, long carbon nanotubes can be cut into two part s, by which we can remove the part where crystal lattice is flawed, and therefor e a perfect nanocomponent can be obtained.     

Impedance spectra of hot, dry gabbro at high temperature and pressure

Impedance spectra of hot, dry gabbro have been studied at 1.0～2.0 Gpa and 593～1173 K.The experimental results indicate that complex impedance depends on frequency of altering current. Impedance arcs representing grain interiors and grain boundaries conduction mechanism are displayed in the complex impedance plane. The impedance arc corresponding to grain interiors occurs over the range of 102～105 Hz, and the impedance arc corresponding to grain boundaries occurs over the range of 12～102 Hz. Each element of equivalent circuit corresponding to grain interiors is fit for complex nonlinear least square program. When garnet occurs in gabbro, the electrical conductivity of gabbro abruptly changes.     

Quasi-cardinality of a Fuzzy Set on a Measurable Universe of Discourse

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普通高校体育教育专业学生专业思想教育探析

运用综合研究方法 ,在对浙江省体育教育专业学生的入学动机、学习积极性、对体育教师职业认知等方面进行调查的基础上 ,分析造成学生专业思想淡薄、对体育教师职业感到悲观的主要原因 ,并就巩固学生的专业思想 ,加强对普通高校体育教育专业学生的专业思想教育提出了看法 .     

Reservoir characteristics and genesis of high-porosity and high-permeability reservoirs in Tarim Basin

Based on detailed studies, this paper proposesthat in the Tarim Basin, hydrocarbon reservoirs widespreadeither in vertical sequences or in plane and high-porosity andhigh-permeability reservoirs are developed all over the basin.However, obvious difference and heterogeneity exist amongdifferent kinds of reservoirs. The lithologic characteristics,reservoir space types and reservoir properties in variousstrata have been probed. The result indicates that althoughthe Paleozoic carbonates have been deeply buried for a longperiod, high-quality reservoirs with the porosity of up to 5%—8% (12% as the maximum) and the permeability of10×10^-3—100×10^-3 μm² (1000×10^-3 μm² as the maximum)can be found in certain areas. These include the area withthe development of reefs and carbonate beaches, the weath-ered-crust buried-hill belts that have undergone thelong-term exposure, weathering and leaching, the area withthe development of dolomitization, and those areas that haveexperienced the resolution of carbonic acid and organic acidgenerated by the maturity of the organic matter. Finally, thegenesis of the high-porosity and high-permeability reservoirsin deep-buried conditions (with the depth more than 3500 m)have been investigated thoroughly.     

鸡足山珊瑚菌资源调查

本报道了作自1997年至1999年间采集于宾川鸡足山的珊瑚菌12种，其中9种是可食的，3种是有毒的，并简要介绍了各种珊瑚菌的形态特征。     

鼻部外形特征的遗传规律

面貌特征是一类遗传率极高的人体性状，通过对家系和群体的鼻部特征进行分类界定，观察记录，确定鼻部的4个性状特征（鼻根高度，鼻背硬骨部，鼻背软骨部，鼻尖方向）为单基因遗传，群体中的偏相关分析和主成分分析显示性状之间有相关性。