337 Result(s)
within
Engineering, general
**ao-** Sun
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Article
Large third-order nonlinear optical properties of C70 fullerene in the infrared regime
The nonlinear third-order optical susceptibility of C70 in a toluene solution is measured for the first time by the method of degenerate four-wave mixing using 10 ns laser pulses at 1.06 μm. The third-order susce...
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Article
Caustic decomposition of scheelite and scheelite-wolframite concentrates through mechanical activation
Based on physicochemical study of the reaction between scheelite and NaOH, a new decomposition process for scheelite and scheelite-wolframite concentrate, i. e., mechenically activating caustic decomposition h...
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Article
A new technology for production of high purity paratungstate ammonium from low grade tungsten concentrate
A new technological process for production of paratungstate ammonium from low grade tungsten concentrate with a high content of calcium and impurities has been studied. The experiments show that average tungst...
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Article
Molecular mechanism of the inhibitory effect of methylation outside the recognition sequence of restriction endonuclease Pvu II on its cleavage activity
In 1991, we found that methylation outside the Pvu II recognition sequence could partially inhibit its cleavage activity. To clarify the molecular mechanism, three plasmids with different methylation states we...
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Article
Os isotopic composition of the earth’s primitive upper mantle
The osmium isotopic ratio of187Os/188Os ranging from 0.126 to 0.127 for the primitive upper mantle (PUM) is obtained according to the correlation between187Os/188Os and Al2O3 of mantle-derived xenoliths and oroge...
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Article
Menadione-induced apoptosis and its mechanism in plants
Menadione can induce apoptosis in tobacco protoplasts. Typical characteristics are detected including the condensation of chromatin, the formation of apoptotic bodies and the degradation of genomic DNA into “D...
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Article
Fractal feature of western fracture zone in **kuangshan antimony mine and its geological significance
In **kuangshan antimony ore-field, the western fracture zone is a composite of major fault, F75, and its secondary faults, such as F71, F72 and F3 etc.. On plane, the fracture zone scatters from southwest to nort...
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Article
Synthesis and characterization of Nd doped M-type hexagonal barium ferrite ultrafine powders
The hexagonal BaNdxFe12−xO19(x=0.1−1.0) fine powders with M-type structure were synthesized by sol-gel auto-combustion high-temperature synthesis method. The structure of powders, gels’ combustion and magnetic pr...
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Article
Microscopic characteristics of different fracture modes of brittle rock
Three types of rock specimens, three-point bending specimen, anti-symmetric four-point bending specimen and direct shearing specimen, were used to achieve Mode I, Mode II and mixed mode I–II fracture, respecti...
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Article
Granular dynamic shear strength and its influencing factors
The granular dynamic shear strength is the same as that of the static one in nature, as found from numerous experiments and investigations. The shear strength is equal to the sum of the internal frictional for...
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Article
CSIRO’s multiphase reaction models and their industrial applications
The status and ongoing work on a multiphase reaction model developed at the Commonwealth Scientific & Industrial Research Organization are outlined in this article. The package enables metallurgists to simulat...
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Article
Characteristics of rockburst and its mining technology in mines
In order to resolve how to mine under the condition of high stress with rockburst, this paper analyzes the law of rockburst, and considers that most of the rockbursts occur in the high stress area of stope. A ...
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Article
Magnetostratigraphy of Late Cenozoic fossil mammals in the northeastern margin of the Tibetan Plateau
A number of fossil mammals have been found in the very thick Cenozoic stratigraphy of the Guide Basin in the northeastern margin of the Tibetan Plateau. Some of these are of great significance in mammal evolut...
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Article
Non-smooth environment modeling and global path planning for mobile robots
An Approximate Voronoi Boundary Network is constructed as the environmental model by way of enlarging the obstacle raster. The connectivity of the path network under complex environment is ensured through buil...
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Article
Use of double edge-cracked Brazilian disk geometry for compression-shear fracture investigation of rock
A new specimen geometry—the double edge-cracked Brazilian disk and a relevant fracture analysis by weight function method are proposed for the investigation of rock fracture caused by compression-shear loading...
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Article
Decomposing scheelite and scheelite-wolframite mixed concentrate by caustic soda digestion
Scheelite and scheelite-wolframite mixed concentrates with different grades were decomposed by caustic soda digestion, and the effects of caustic soda (NaOH) dosage, the ratio of water to ore and the stirring ...
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Article
Effects of symmetrically alternative rotating flow on flocculation
A symmetrically alternative rotating flow pattern was designed for flocculation process in order to produce large and dense flocs. The special effects of a symmetrically alternative rotating flow on the diamet...
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Article
Purification technology of molten aluminum
Various purification methods were explored to eliminate the dissolved hydrogen and nonmetallic inclusions from molten aluminum alloys. A novel rotating impeller head with self-oscillation nozzles or an electro...
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Article
Dam** performance of Cu-Zn-Al shape memory alloys in engineering structures
The stress strain curves of two CuZnAl shape memory alloys which have the martensitic transformation temperatures of 50 °C and −10 °C respectively, were measured by using electronic material tester after treat...
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Article
Simultaneous determination of adenine, uridine and adenosine in cordyceps sinensis and its substitutes by LC/ESI-MS
A simple, sensitive and reproducible high performance liquid chromatography-mass spectrometry coupled with electrospray ionization method for simultaneous separation and determination of adenine, adenosine and...
