143,001 Result(s)
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**qi Zhou
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Article
Siderophile-enriched sediments from the Cretaceous–Tertiary boundary
Siderophilic element concentrations are high in sediments from the Cretaceous–Tertiary boundary. An extraterrestrial source is indicated. Concentrations are too high to be understood in terms of the impact of ...
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Chapter
The Effect of Cutting Conditions on the Built-Up Edge
By means of a quick-drop-cutter device, many specimens of the chip root formed under various cutting conditions were obtained, and these specimens were polished and etched. On these specimens, the geometric pa...
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Chapter and Conference Paper
A Comparative Study on Methods of Tillage of Paddy Soils in Taihu Lake Region
The principal rotation system in Taihu Lake Region is rice-wheat rotation. The traditional method of tillage is such that in the cultivated layer there is an upper sub-layer with muddy paste and a lower sub-la...
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Chapter and Conference Paper
Investigation on Nitrogen-Fixing Bacteria in Rice Rhizosphere
It has been confirmed in many laboratory and field experiments that the nitrogen-fixing activity in rice rhizosphere is rather high. There has been a number of different nitrogen-fixing bacteria isolated from ...
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Chapter and Conference Paper
Studies on the Preparation of Dried Inoculum of Blue-Green Algae and its Application in Paddy Field
The nitrogen-fixing blue-green algae (Anabane azotic) possesses the ability of fixing nitrogen and carbon. Certain amount of amino acids, polypetides and carbohydrates are excreted from metholic process during it...
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Chapter and Conference Paper
Effect of Water Conditions and Organic Matter on Modulus of Rupture of Paddy Soils
In recent years the tilth of some paddy soils in Jiangsu Province becomes inferior owing to the change in crop** system. The increase in modulus of rupture of the soil is one of the important manifestations ...
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Chapter and Conference Paper
Effect of Nitrapyrin on the Inhibition of Nitrification in Some Paddy Soils of China
Nitrification-denitrification is an important mechanism of N loss in paddy soils. How to prevent such loss is a matter of primary importance (1–4). The present article deals with the effect of Nitrapyrin (2-ch...
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Chapter and Conference Paper
Electrical Behaviour of Hydrogen Ions in SiO2 Films on Silicon
The electrical behavior of the mobile hydrogen ions in the thermally grown SiO2 films were studied by using the C-V measurements, the thermally stimulated ionic current, and the avalanche injection techniques. It...
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Article
Relationship between column efficiency and column length in chromatography: Efficiency of small-bore HPLC columns of different length
The relationship between column length and efficiency is theoretically derived. Based on experimental data, the validity of the relationships between peak width and retention time, and between plate height, co...
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Article
Studies on the Sorghum Shootfly in China
As an important measure for increasing grain production, hybrid sorghum has been cultivated in the whole area of the Peoples Republic of China since 1970. Over the past 10 years the sorghum shootfly has gradua...
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Article
Observations of the effects of temperature and crystallographic orientation on surface segregation in an Fe-Si-Sn-C alloy
Auger electron spectroscopy was used to study segregation of Group IVB solutes to the surfaces of individual grains of a poly crystalline Fe-3.1 pct Si-0.06 pct Sn-0.004 pct C alloy heated in UHV. As the tempe...
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Article
High noble metal concentrations in a late Pliocene sediment
A 2.3-Myr-old layer in a sediment from the Antarctic Ocean contains Ir and Au at levels comparable with those at the Cretaceous–Tertiary boundary. A sizable fraction of the noble metals is contained in vesicul...
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Article
The eigenvalue problem and expansion theorems associated with Orr-Sommerfeld equation
The eigenvalue problem and expansion theorems associated with Orr-Sommerfeld equation are fundamental for the investigation of the stability of laminar fluid motion and have been studied by many authors. Never...
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Article
Book reviews
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Article
Preparation and analysis of high-T c Nb-Ge films
The dependence of Tc on sputtering conditions, chemical composition, and phase structure for Nb-Ge films has been studied. It was found that Tc varied with composition, but was not dependent on exact stoichiometr...
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Article
Isolation of sodium dependent variants from haploid soybean cell culture
Following ultraviolet mutagenesis, we have isolated two Na+ dependent variants from haploid suspension cultures of soybean cells. No selection was used in the isolation procedure. These cells cannot grow in 1 mM ...
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Article
The early stages of oxidation of ion-implanted nickel at high temperature
The early stages of oxidation of nickel implanted with nickel, chromium, or lithium ions in oxygen at 1100°C have been studied using various electron-optical techniques. The unimplanted metal develops initiall.....
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Article
Field evidence for active normal faulting in Tibet
Crustal thickening does not now occur in southern Tibet. Field observations made during the Chinese–French expedition of 1980 support an earlier hypothesis based on a combined analysis of satellite images and ...
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Article
The Tibetan side of the India–Eurasia collision
Results are reported from the 1980 joint French–Chinese field expedition in Tibet. The area covered was from the High Himalaya in the south, to the region of Nagqu ∼250 km north of Yangbajain. Ophiolites in th...
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Chapter and Conference Paper
On-Line non-contact Measurement of Optical Fiber Diameter by Forward Scattering Laser System
In this paper we describe a system for the measurement of optical fiber diameter on-line in drawing process by forward light scattering with a He-Ne laser as the light source /1,2,3/.
