To manage heat load problems in deep mining, a research program for measuring and predicting the underground environment parameters was carried out in Jiudian gold mine. The deposit is buried from 150 to-950 m underground. The development drifts reach the-710 m Level and the mine's main production levels are at-510 and-550 m. The mine encountered several hot springs, though blocked, the springs still affect the underground environment. Some environment parameters were measured at three mining levels in summer and winter, including the temperature and moisture of air flow, and the temperature of the rock face and of the internal rock mass. Based on the energy conservation law and the mass conservation law, an environment parameter prediction model was built, and the corresponding computer program was developed using C++ language. Comparison of predicted and measured data proved the reliability of the environment parameter prediction model.
In order to explore the fishery, oil and gas, and tourism resources in the ocean, Very Large Floating Structures (VLFS) can be deployed near islands and reefs as a logistic base with various functions such as a floating harbor, accommodation, fishery processing, oil and gas exploration, environment surveillance, airplane landing and taking off, etc. However, in addition to the complicated hydroelastic coupling effects between the hydrodynamic loads and structural dynamic responses, when tackling the hydroelastic problems of floating structures deployed near islands and reefs, several other environmental effects and numerical techniques should be taken into account: 1) The influences of the non-uniform incident waves (multi-directions, different wave frequencies); 2) Complex seabed profile and its impact on the incident waves; 3) Nonlinear second order wave exciting forces in the complex mooring system, shallow water and coral reef geological conditions; 4) Parallel computing technology and fast solving methods for the large scale linear equations, accounting for the influence of dramatic increase of number of meshes to the computation efforts and efficiency. In the present paper the theoretical investigation on the hydroelastic responses of VLFS deployed near islands and reefs has been presented. In addition, based on the pulsating source Green function, the high performance parallel fast computing techniques and other numerical methods, in solving large scale linear equations, have been introduced in the three-dimensional hydroelastic analysis package THAFTS. The motions, wave loads, distortions and stresses can be calculated using the present theoretical model and the results can be used in the design and safety assessment of VLFS.
Water pollution is one of the major problems that need
to be solved
in modern society, and there is a need to develop an effective adsorbent
to purify the polluted water. In this article, three supramolecular
metallohydrogels containing a three-dimensional network structure
have been prepared from rosin derivatives. The supramolecular metallohydrogels
have good thermal stability and maintain mechanical strength at high
temperatures. Interestingly, the sodium N-(dehydroabiety1)maleamate/Ca2+ supramolecular metallohydrogels exhibit rare multi-stimulus
responsiveness (mechanical vibration, temperature, pH, EDTA, etc.),
especially to mechanical vibration with over 10 cycles, indicating
ultra-mechanical response properties. More importantly, the unique
three-dimensional network structure of the metallohydrogels can effectively
adsorb cationic dyes in the wastewater. The adsorption amount and
adsorption rate of this supramolecular metallohydrogels for rhodamine
6G after 48 h were at least 160.6 mg/g and 97%, respectively. The
adsorption kinetic process of this metallohydrogel follows a quasi-secondary
kinetic model, where the adsorption process is mainly electrostatic
and weak π–π interactions. And the metallohydrogels
can also be recovered by 0.5 mol/L hydrochloric acid solution desorption
after adsorption of the dye. This is the first supramolecular metallohydrogel
system prepared from the natural product rosin and applied to dye
adsorption. This broadens the application of rosin in the field of
supramolecular gel and dye adsorption and recycling.
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