47 Result(s)

Article

Time to collision is signalled by neurons in the nucleus rotundus of pigeons

THROUGHOUT the animal kingdom, the sight of a rapidly approaching object usually signals danger and elicits an escape response^1–6. Gibson⁷suggested that the symmetrical expansion of an object's image (looming) is...

Yongchang Wang, Barrie J. Frost in Nature (1992)

Article

Noble gas isotopes in natural gases from Central and Northwest China

Sheng Xu, Yongchang Xu, ** Shen, Shun’ichi Nakal… in Chinese Science Bulletin (1997)

Article

A model for carbon isotope distribution of methane during diagenesis

The evolution of methane carbon isotope with depth has been discussed based on diagenetic reaction kinetics and isotopic Rayleigh fractionational theory. A mathematical model to describe data of methane carbon...

** Guan, Yongchang Xu, Wenhui Liu, Darui Wang in Chinese Science Bulletin (1998)

Article

A breakthrough of researching reservoir adsorption gas and its significance

GC-C-MS on linear isotope analysis equipment makes it possible to measure the hydrocarbon gases at the level of 10⁻³–10⁻² μL. By applying this technique the carbon isotopes of C₁-C₃ of the adsorbed gas from the T...

Yongchang Xu, **aobao Zhang, ** Shen, Wenhui Liu in Chinese Science Bulletin (1999)

Article

Natural gas geochemistry of low evolutionary stage of medium- and small-sized basins in Yunnan Province, southwestern China

The biogenic gas and premature-low mature associated gases in some medium and small-sized basins of Yannan Province, such as Luliang, Yanglin, Baoshan and **ggu basins, have beed researched. The results show ...

Yongchang Xu, ** Shen, Jiang**g Zhen, Wenhui Liu, ** Guan in Chinese Science Bulletin (1999)

Article

Growth of decagonal quasicrystal phase in laser resolidified Al₇₂Ni₁₂Co₁₆

An ultra-high temperature gradient directional solidification process produced by a widened laser beam was adopted to achieve the directionally solidified microstructure of the stable decagonal quasicrystal ph...

Yongchang Liu, Gencang Yang, **nbao Liu, Yaohe Zhou in Chinese Science Bulletin (2000)

Article

Isotopic composition characteristics and identification of immature and lowmature oils

Isotopic composition characteristics and the significance of immature and low-mature oils are first systematically discussed. The carbon isotopes of the whole oil can be divided into two groups, one has δ¹³C main...

Yongchang Xu, ** Shen, Wenhui Liu, ** Guan, Difan Huang in Chinese Science Bulletin (2001)

Article

An approach to noble-gas isotopic compositions in natural gases and gas-source tracing in the Ordos Basin, China

Isotopic compositions of noble gases, i.e. He Ar Kr and Xe, are measured in natural gases from the Zhongbu gasfield in the Ordos Basin. And heavy noble-gas isotopes (Kr, Xe) are here first used in geochemicall...

Wenhui Liu, Mingliang Sun, Yongchang Xu in Chinese Science Bulletin (2002)

Article

Abnormal austenite-ferrite transformation behavior in pure iron

The austenite → ferrite transformation is the most important reaction route in the manufacture of Fe-based materials. Here the austenite (γ) → ferrite (α) transformation of pure iron was systematically explore...

Yongchang Liu, F. Sommer, E. J. Mittemeijer in Chinese Science Bulletin (2004)

Article

Effects of age on latency and variability of visual response in monkeys

Shan Yu, **usong Wang, Yu Fu, Jie Zhang, Yuanye Ma… in Chinese Science Bulletin (2005)

Article

Influences of marine floor hydrothermal activity on organic matter abundance in marine carbonate rocks — A case study of middle-upper Proterozoic in the northern part of North China

Study indicates that the elements rich in marine floor hydrothermal fluids have a positive influence, not only on total organic carbon (TOC), but also on the abundance of SiO₂ in some Middle-Upper Proterozoic str...

Jie Wang, Jianfa Chen, Zhidong Bao, Shuichang Zhang… in Chinese Science Bulletin (2006)

Article

Abnormal growth of Ag₃Sn intermetallic compounds in Sn-Ag lead-free solder

The abnormal growth of Ag₃Sn intermetallic compounds in eutectic Sn-3.5% Ag solder was investigated through high-temperature aging treatment. Microstructural evolutions of this solder before and after the aging t...

Jun Shen, Yongchang Liu, Houxiu Gao in Chinese Science Bulletin (2006)

Article

Classification and regionalization of the forming environment of windblown sand disasters along the Tarim Desert Highway

Through the systematic field survey and observations, the factor quantification as well as setting the criteria, the sand disaster-forming environment along the Tarim Desert Highway can be divided into four gr...

JiaQiang Lei, ShengYu Li, DongDong Fan, HongWei Zhou, Feng Gu… in Chinese Science Bulletin (2008)

Article

Effects of natural covers on soil evaporation of the shelterbelt along the Tarim Desert Highway

The control of soil evaporation is one of important approaches to save water. The artificially simulated evaporation experiments have been conducted in the hinterland of the Taklimakan Desert to reveal the eff...

HongWei Zhou, ShengYu Li, ShuGuo Sun, **nWen Xu, JiaQiang Lei… in Chinese Science Bulletin (2008)

Article

Geochemical characteristics of light hydrocarbons in natural gases from the Turpan-Hami Basin and identification of low-mature gas

Theoretical and practical knowledge regarding low-mature gasses is of significant importance to identifying potential natural gas resources. Light hydrocarbon parameters and C and H isotopes are useful tools t...

** Shen, **aoFeng Wang, ZhiYong Wang, Qian**ang Meng… in Chinese Science Bulletin (2010)