To explore the reaction mechanism of low-temperature oxidation coal and law active groups producing CO through oxygenolysis, this article analyzed characteristics free radicals functional during by using electron spin resonance Fourier transform infrared technologies. Based on gas chromatograph analysis, index produced spontaneous combustion was studying oxygen-containing groups. The experiments showed that, with rising oxidizing temperatures from 30°C to 230°C, g-value increased first then...

In situ synthesis of Ni x Se y –NiFe LDH core–shell nanoarrays on nickel foam for electrochemical oxidation 5-hydroxymethylfurfural and furfural.

The polyurethane foam as a representative nonaqueous reacted polymer grouting material has become one kind of advanced comprehensive performance material, and therefore it is necessary to research on its anti-permeability properties. According impermeability grade method, materials are tested under different initial pressures densities. results indicate that the density generally at range 0.1g/cm 3 ～0.3g/cm seepage pressure 0.3～0.7MPa, which can bear 30 70 meters head when carried out in...

A single physical or chemical inhibitor can hardly meet the uttermost requirements for coal spontaneous combustion prevention. Therefore, it has become essential to develop an efficient with multiple inhibitory properties. In light of studies on properties super absorbent polymer (SAP), main antioxidant pentaerythritol tetrakys 3-(3,5-ditert-butyl-4-hydroxyphenyl) propionate and auxiliary tris (2,4-di-tert-butyl-pheny) phosphite, a synergistic both was prepared. According determination...

Flexible supercapacitors have attracted widespread attention from many researchers as a type of portable energy storage device. As unique carbon material, graphene has shown great potential in supercapacitor electrodes, mainly due to its large theoretical specific surface area, high conductivity and chemical stability. Therefore, reasonable design graphene-based hydrogels with low cost, excellent mechanical properties is significance for flexible wearable device applications. Oxygen-doped...

Proton-coupled electron transfer (PCET) reactions are ubiquitous in chemical and biological processes. However, the role of pH has been a source confusion, hindering our understanding PCET mechanism. In dilute buffered solutions, new anodic hydroquinone wave depends on proton acceptor, two cathodic quinone waves also depend donor. New complexes corresponding to ruled out because UV/vis spectra did not vary with concentration buffer solution at same pH. The reaction rate is dependent pH, it...

Hybrid nanosheet-structured NiCo₂O₄ on CFP as a self-supporting electrode for electrochemical oxidation of HMF to FDCA.

In dilute buffer solutions, cyclic voltammograms (CVs) of hydroquinone (QH2) and quinone (Q) depends on the capacity (β). The explanation is that pH changes at electrode surface cause electrochemical redox rates QH2 Q rapidly decline new peaks occur. An approach has been developed for measuring β, which requires introduction or into solution instead a strong acid base. Therefore, potential intracellular βi without interference from proton transportation. was successfully applied to measure β...

An electrochemical method of determination cysteine has been developed in the solution containing catechol as indicator. Nucleophilic addition thiol species to electrogenerated o-quinone results formation o-quinone-cysteine adducts that easily accumulate use at surface electrode acidic solution. Therefore, cyclic voltammetry leads amplification adduct's reductive current. As was performed prior differential pulse voltammetry, peak could be separated preferentially from voltammogram and...

A novel dendritic fractal Cu hs –Ni–P/CF electrode was synthesized by electrodeposition for electro-hydrogenation of 5-hydroxymethylfurfural.

Reduced graphene oxide (RGO) flexible film pillared with lignosulfonate (LS) and carbon microspheres (CM) was fabricated via a facile vacuum-filtration process to serve as high-performance electrode material for supercapacitors. Composite electrodes comprising biomass materials have the advantages of being flexible, lightweight, cheap, environmentally friendly. The addition LS CM between RGO layers mitigated self-restacking reduced flakes. displayed high specific capacitance 641 mF cm-2 at...

Aiming at the problems of applied technology ground penetrating radar(GPR), rationality and applicability some common existed dielectric constant models to asphalt concrete material are verified modified based on experiment, then new model suitable for established. The real project, results show that can explain characteristics more accurately, calculated error compaction pavement structures is significantly reduced compared models.

Simply supported hollow slab bridge is widely used in highway network of China. Under overload vehicles, the concrete hinges such bride are easily damaged, which usually causes single bearing and tremendously reduces bridge’s load capacity. It necessary to take some reinforcement measures enhance carrying capacity impaired for traffic safety. In this paper, a field experiment an actual bridge, has experienced destructive test with its transverse connections seriously was performed by...

Recently, the demand of large and medium Biogas Plants in China is increasing. In order to increase volumetric gas production rate, High gravimetric solid fermentation becoming a hot focus for research, difficulty how content fermenter substrates, at same time, amount not decreased. this paper, we select pig manure, cow manure chicken do experiment with temperature 35°C, initial pH 7, 4 contents. We can determine every process figure capacity optimal content. The results show that as...

Dielectric constant is the most important material property which ground penetrating radar(GPR) data reflects. Based on experiment, through determination of compressive strength during concrete mixture ages and real part imaginary dielectric constant, relationship between cement studied. It shown from achievements that there has feasibility to non-destructively test by using GPR.

Using finite element software, the analysis model of semi-rigid base pavement with voids is established. Variation deflection under load Falling Weight Deflectometer (FWD) studied and reference critical value obtained to determine whether there are voids. According basin data different location, identification method for void location The field test shows that it feasible use this technology in pavement.

A nano-CuO/silica sol wood preservative was obtained by dispersing CuO nanoparticles in propylene glycol and silica sol. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction analysis, thermogravimetric compressive tests were conducted to investigate the effects of different post-treatments, i.e., steaming at 100 °C freezing -30 °C, on variations microstructure, mechanical, physical, thermal stability properties preservative-impregnated wood. The results...

Aiming at collapse in the excavation of tunnel western Henan, measures including cement grouting and leading conduit are proposed to be used treatment collapse, processes is numerical simulated. Comprehensive analysis shows that broken surrounding rock strength has been improved significantly, it worked fine after being treated.

The hydrogenolysis of α-methylbenzyl alcohol (MBA) to ethylbenzene (EB) over Pd/C catalyst was studied. XRD and TEM results show that Pd nanoparticles are well dispersed on the carbon support with good crystallinity. There is no 1-cyclohexylethanol or ethylcyclohexane in products, indicating excellent for inhibiting hydrogenation aromatic ring. Alcohol solvents beneficial increase catalytic activity because their strong polarity solubility.

The thickness of pavement structural layer is one the key indicators quality detection, which has a great impact on normal use pavement. Among algorithms that calculating this indicator, particle swarm optimization algorithm low inversion accuracy while genetic efficiency. This thesis put forward hybrid analysis method based and algorithm. By taking advantages above two combining characteristics selection, crossover, mutation fast convergence optimization, could improve under condition...