Diffusion of hydrogen and its isotopes in BCC-metals

Quantumstates and potential configurational relief of hydrogen atomin BCC-metals is considered. Onthe basis of the quantumstate data ,two regi mes of hydrogen andits isotopes incoherent transport throughmodel BCC-systems ,pure metals and dilute solid solutions are considered. Local lattice deformation neari mpurity centre and phonons dispersion was takeninto account under diffusion coefficient derivation.The type of a crystal lattice determines the mechanismof the hydrogen atomdiffusion elem…     

Micro-seismic wave＇s propagation law and its numerical simulation

Deduced the propagation rule of longitudinal and transverse wave. On the basis of this, propagation rules in attenuated visco-elastic media and varied Lame coefficient were put forward as well. The subsequent numerical analysis found that in a small scope longitudinal and transverse wave could be considered as homogeneously propagating when faultages and joints were not taken into account. The existence of lane hindered the wave＇s propagation, and it made the velocity gradient change in a local vicinity area. Therefore velocity varied in different direction.     

Study on the rights and interests value of mineral resources and its evaluation method

The rights and interests value of mineral resources includes the prospecting rights value and the mining rights value. The mining rights value is made up of the mineral resources value and the compensation value based on the in puts of capitals and labors indifferent exploration stage, the prospecting rights value should be equal to exploration differential rent of resources. According to the stage characteristic of mineral resources exploration and development, the initial evaluating methods and models are used to evaluate the prospecting rights and mining rights value.     

A new type of inferior vena cava filter and its animal experiment

1IntroductionPul monary embolism(PE),also called lung embolism,is the clinical pathological physiological syn-drome of the dyshemia in the lung caused by thrombus or other kinds of embolus clogging the pul monaryartery andits branches.In75%-90%of the cases,pul monary artery embolus hasits sourceinthe veinsinlower li mbs and the cavitas pelvis.The thrombus amotioes fromthe vein andis sent to the cor dextrumbybloodstream.At last it reaches the pul monary artery andthus pul monary embolismcomes …     

Incorporation of polyoxometalate-based acid–base pair into a sulfonated MIL-101 for achieving proton-conduction materials with high proton conductivity and high stability

Currently,it is of great significance to develop new proton-conduction materials with high proton conductivity,high stability,and good conducting durability to meet the demands of fuel cell and sensors.Herein,we prepared two composites DETAHPW@MIL-101-SO3 H 1 and TETA-HPW@MIL-101-SO3 H 2(DETA=diethylenetriamine,HPW=H₃ PW₁₂0₄₀·xH₂ O,MIL=Material Institut Lavoisier,TETA=triethylenetetramine) by encapsulating polyoxometalate(POM) and organic amine into a ...     

Physico-chemical analysis of collagen and its mixtures with water-principles of microcapsular therapeutic systems

At present ,the attention of producers of medicinal preparations is focussed on therapeutic systems ofmicrocapsular type the manufacture of whichis based on nanotechnologies . As a polymer base of microcap-sules ,natural polymers such as collagen and gelatin are used and besides ,they are subjected to specialtreat ments that lead to the change in their structure . Therefore ,the detection of interconnection betweenthe structure and physico-chemical properties of natural polymers is an urgent p…     

Research on high density and safety LiCoO_2 as cathode materials for lithium ion batteries

1IntroductionLithiumion batteries are largely adopted for potable electronic devices due to its high capacity,highvoltage and good safety attributes.The advancement of lithiumbattery requires newtype of cathode mate-rials with high energy density,as well as good safety and lowcost.Accordingly the cathode materials arebeing developedin two directions[1].One wayis toincrease the gravi metric capacity of the materials,e.g.by preparing Li Ni1-yCoyO2with higher capacity but poor thermal stability…     

R & D project''''s investment evaluation based on real option and its value at risk

Recently ,therealoptionmethodsintheprojectevaluationtheoriesanditsapplicationhavereceivedmoreatten tion[1] ,butmanydiscussionsjustappliedautomaticallythefinancialOption pricingmodel (suchasBinominalOption pricingModel,Black ScholesModel) .Formostprojects,theirindeterminacieshavedifferentcharacteristics,andtheircharacteristicsofincomeandriskisdifferenttoo ,sowecan’tapplythefinancialtheoriesautomatically .Additionally ,theactualrealoptionmethodsfocusontheproject’sreturnandsaylittleoftheriska…     

Interaction mechanism of miscible DDA–Kerosene and fine quartz and its effect on the reverse flotation of magnetic separation concentrate

In this study, a modification of oil assisted flotation processes of quartz particles has been proposed, which is based on introduction of miscible Dodecylamine (DDA)-Kerosene as collector with DDA cationic surfactant coated on kerosene to the hydrophilic quartz particles in the pulp. The property of miscible DDA–Kerosene emulsion was investigated. Due to the adsorption of DDA at kerosene/water interface, a smaller and uniform kerosene emulsion formed. Addition of cationic surfactant to the kerosene emulsion changed the zeta potential value from negative to positive, which resulted in enhancing the adhesion of the oil droplets to negatively charged quartz. The results showed that agglomeration and flotation process can be realized simultaneously with DDA–Kerosene. The agglomeration of fine quartz minerals in the presence of miscible DDA–Kerosene led to the formation of very large compact agglomerates resulting in increasing hydrophobicity of the particles and inducing a higher probability of collision and adhesion to air bubble. Experimental data indicated that miscible DDA–Kerosene had better selectivity and stronger collectability to quartz than DDA–HCl, which can be used as an efficient collector in the reverse flotation of magnetic separation concentrate of TISCO. At the same DDA dosage (60 g/t), separation efficiency got to 18.53% when using DDA–HCl as collector; while a better result was obtained with DDA–Kerosene, the efficiency of separation reached 59.07% which was identical with 120 g/t DDA–HCl.     

Investigation of thermal and photoacoustic processes in layered structures under irradiation of modulated laser beams of high energy

In present work the features of the interaction between modulated laser beams and layered structuresare investigated.It was shown,that a modulation of beams allowed to obtain specific shape of temperaturefield by changing pulses repetition rate.Also photoacoustic effect was investigated.In order to modulate the effect,corresponding thermoelastic deformation equation was solved.Lami-nation was takeninto account by special procedure of averaging of combined equations.Solutions obtainedfor defor…     

Effluent Water Quality at Phosphate Mines in M’Dhilla,Tunisia and its Potential Environmental Effects

The physicochemical characteristics of effluent water produced by phosphate mining and processing in M’dhilla, Tunisia, its potential environmental effects, and its suitability for irrigation were studied. Five effluent water samples were collected from the M’dhilla phosphate plant and analyzed for selected parameters, including chemical and biochemical oxygen demand, metals, sulfate, and chloride. Most of the contaminant concentrations exceeded international water quality standards. Water treatment is recommended for all effluents in the M’Dhilla industrial area to improve received water quality. The potential adverse environmental effects and human health risks associated with the discharge of phosphate mining wastewater are also discussed.     

Application of wavelet packet decomposition and its energy spectrum on the coal－rock interface identification＊

The theory and method of wavelet packet decomposition and its energy spectrum dealing with the coal-rock Interface Identification are presented in the paper. The characteris-tic frequency band of the coal-rock signal could be identified by wavelet packet decomposition and its energy spectrum conveniently, at the same time, quantification analysis were per-formed. The result demonstrates that this method is more advantageous and of practical val-ue than traditional Fourier analysis method.     

Propanetricarboxylic acid ornamented multi-CeⅢ encapsulated phospho(Ⅲ) tungstate and its electrochemical sensing properties

A propanetricarboxylic acid ornamented multi-Ce^Ⅲ encapsulated phospho(Ⅲ)tungstate [H₂N(CH₃)₂]₄Na₄H₂[Ce₄(HP)W₄(H₂0)₁₄(H₂PTCA)₂O₁₈][(HP^Ⅲ)₂W₂₂O₇₆]·16H₂O(1,H3PTCA=1,2,3-propanetricarboxylic acid) was obtained by a facile one-step reaction of Na₂WO₄·2H₂O,H_3<...     

Structure and physical properties of high pressure phases in rare earth intermetallic systems R(Fe1-xMx)2 and R‘1-xR“xFe2

1 Introduction 　　Rare earth intermetallic compounds of Laves phases stoichiometry RT2 are crystallized in two structural types: hexagonal C14 and cubic C15.……     

Surface Soil Water Content Before and After Coal Mining and its Influencing Factors—A Case Study of the Daliuta Coal Mine in Shaanxi Province,China

The spatial variability in soil water content in the Daliuta mining area in western China was studied before and after coal mining using ground penetrating radar and geostatistical methods. The relationships among soil water content, soil physical properties, topographical factors, and vegetation density were analysed using classical statistics. The average surface soil water content changed slightly between the two detection events at the centre of the subsidence, from 0.084 cm³/cm³ to 0.079 cm³/cm³; there, the distribution of the soil water content was more closely related to terrain than any of the other factors being considered. Along the subsidence boundary, the surface soil water content decreased significantly after mining, from 0.099 cm³/cm³ to 0.083 cm³/cm³ at one location. The total soil porosity, soil organic matter, and soil clay content were positively correlated with soil water content before mining. However, after mining, the relationship between total soil porosity and soil water content significantly strengthened while the relationships between other soil physical and chemical properties and soil water content weakened. Vegetation was determined to be the main factor controlling the surface soil water content before and after coal mining at one location in a small (1,600 m²) area of the subsidence boundary.