Analysis on Effect Decomposition of Industrial COD Emission

AbstractIn this paper, which is based on the effect decomposition model of the emission of pollutants, the change of the industrial COD emission is researched, and a quantitative analysis is carried out for the scale effect, structure effect and technology effect of the industrial COD emission change. The driving factors and causes for this kind of change are identified and the contribution of the three kinds of effects on the pollution reduction is analyzed. The results show that the gradually increasing scale effect is a major factor causing increasing stress on the pollution reduction. The structure effect which is overall low indicates that the activities of optimization and adjustment for the industrial structure have no significant effect. The increment of the generalized technology effect is a main reason for the reduction of the pollution emission. Wherein, the upgrading of industrial technology and the development of scale economy make a great contribution to reduction of pollution. It is an important way to realize the target of pollution reduction by using clean technology effect to offset the new emission and reducing the stock with pollution control effect

Effect of selective post-aging treatment on subsurface damage of quasicrystal reinforced Al composite manufactured by selective laser melting

In this work, Al-Fe-Cr quasicrystal reinforced Al matrix composite was in-situ prepared by using selective laser melting from powder mixture of Al-Cu-Fe-Cr quasicrystal and pure Al. The effect of selective post-aging treatment on microstructure and mechanical properties were determined with focus on the metastable phases. The microstructural analysis, which was determined by X-ray diffraction and scanning electron microscopy, indicates that the Al-based intermetallic is precipitated from supersaturated α-Al after the aging process. Moreover, the compression tests were performed on the samples in form of dense and lattice structures (50% porosity). The elastic modules of dense and lattice structural samples reduce from 21.3 GPa and 4.4–14.6 GPa and 3.6 GPa by using a low cooling-rated aging process. After aging process, the compressive deformation behavior of dense part changes from elastic-plastic-fracture mode to elastic-plastic-densification mode. On the other hand, the failure mechanism of lattice structural sample changes from rapid-single-stage to slow-double-stage with an improvement of the strain at failure

Mistakes in quasilattices

We studied a class of mistakes or faults in quasilattices. The effect of a random distribution of mistakes on the diffraction of 1D, and a special class of 3D, quasilattices is calculated exactly. Mistakes change the diffraction pattern qualitatively: Some Bragg peaks decrease in intensity as expected, but some are enhanced. As a result some spots disappear and some new ones appear. The diffuse scattering is also calculated. Results are given comparing calculated diffraction patterns in fivefold, threefold, and twofold symmetry directions for a 3D quasicrystal with and without mistakes

Competing order parameters for increased Tc in "polytype" multilayer Cu-O systems

Using a simple phenomenological model with coupled order parameters for polytype multilayer copper oxide systems, it is demonstrated that polytypism can increase Tc. Explicit expressions and results are given for Tc(N) where N is the polytype number (N=2, 3, , . Classes of structures investigated are monolayer polytypes such as [-(CuO2)N-]; bilayer TlO polytypes such as [-(TlOTlO(CuO2)N-]; and monolayer TlO polytypes; and 1:2:3 polytypes such as [-(CuO2)-(CuO-CuO2)n-]. Two types of nearest-layer bilinear coupling were studied: weak link (Josephson) and spin-spin. Polytypism is predicted to increase Tc in all classes; except in one case. For the same N, monolayer TlO polytypes have lower Tc than the bilayer TlO analog. Using reasonable values of parameters we predict a maximum Tc of 140 K in the monolayer and bilayer TlO series

Electronic structure of a quasiperiodic system

The general solution of a Schrödinger equation with a quasiperiodic potential in n dimensions is obtained. A boost technique is presented, which will transform the problem to the solution of a periodic pseudo-Schrödinger equation in n+m dimensions, to which Floquet-Bloch theory is applicable. We show that the eigenfunctions of the original problem and the boosted problem are related to each other by a simple radon transform, and the eigenvalues are exactly equal. We identify the hierarchical gap structure in the energy spectrum observed in numerical simulations and we show that the location of gaps can be indexed by the reciprocal wave vector given by the diffraction pattern of the quasicrystal. The position and the magnitude of the gaps so predicted are in qualitative agreement with numerical simulations

Acoustic-wave propagation in quasiperiodic, incommensurate, and random systems

We have studied acoustic-wave propagation in one-dimensional systems with quasiperiodic, incommensurate, and random modulation. In the short-wavelength limit we found that if the initial pulse is narrow (with spatial extension of the order of a few lattice spacings), the pulse is localized in a quasiperiodic system as in the case of a random system. This result shows that at short length scales a quasiperiodic system is similar to a random system. Therefore, those transport properties that do not depend on long-range order should behave similarly in quasicrystals and in an amorphous metallic glass, in agreement with experimental findings. On the other hand, if the injected wave has a wavelength much larger than the lattice spacing, we found that there are resonances for quasiperiodic and incommensurate systems when the wave vector satisfies the Bragg conditions. In this case propagation appears to be diffusive rather than propagative; namely, the total energy of the initial wave does not propagate along the chain as it does otherwise, but is homogeneously distributed over the region of space where the wave front passed. We solved the problem analytically in the long-wavelength limit in terms of two-mode-coupling theory and the Fourier spectrum of the quasiperiodic system. Analytical results are in full agreement with numerical simulations. These indicate that on a long-range scale quasiperiodic order is important not only for the crystal structure but also for those physical properties which depend on long-range order, such as acoustic-wave and microwave propagation

Properties of one-dimensional quasilattices

We study the properties of one-dimensional quasilattices numerically and analytically. The geometrical properties of general one-dimensional quasilattices are discussed. The Ising model on these lattices is studied by a decimation transformation: The critical temperature and critical exponents do not differ from those for a regular periodic chain. The vibrational spectrum in the harmonic approximation is analyzed numerically. The system exhibits characteristics of both a regular periodic system and a disordered system. In the low-frequency region, the system behaves as a regular periodic system; wave functions appear extended. In the high-frequency region, the spectrum is self-similar and there is no unique behavior for the wave functions. The spectrum shows many gaps and Van Hove singularities. The gaps in the spectrum are also obtained analytically by examining the convergence of a continued-fraction expansion plus decimation transformation. The energy spectrum of a tight-binding electron Hamiltonian on the Fibonacci chain is also analyzed; it shows similar characteristics to those of the lattice vibration spectrum

Microscopic model for high-Tc oxide superconductors

We report results of a BCS-pairing theory of high-Tc superconductors based on a model using interlayer charge-transfer excitation as the intermediate boson. We apply the model specifically to YBa2Cu3O7. The relevant electronic band structure is calculated analytically using the tight-binding approximation, which is in agreement with numerical results. A specific interlayer charge-transfer excitation is identified. The Eliashberg equations are solved in the Kirzhnits-Maksimov-Khomskii approximation to obtain Tc and the gap . We find 2/KTc1014, and Tc increasing exponentially with a decrease in the Cu(2)-O(4) bond length. These results are in general agreement with some recent experiments

The flavor-changing bottom-strange quark production in the littlest Higgs model with T parity at the ILC

In the littlest Higgs model with T-parity (LHT) the mirror quarks induce the special flavor structures and some new flavor-changing (FC) couplings which could greatly enhance the production rates of the FC processes. We in this paper study some bottom and anti-strange production processes in the LHT model at the International Linear Collider (ILC), i.e., $e^+e^-\rightarrow b\bar{s}$ and $\gamma\gamma\rightarrow b\bar{s}$. The results show that the production rates of these processes are sizeable for the favorable values of the parameters. Therefore, it is quite possible to test the LHT model or make some constrains on the relevant parameters of the LHT through the detection of these processes at the ILC.Comment: 12 pages, 8 figure

Insights into in-situ catalytic degradation of plastic wastes over zeolite-based catalyst from perspective of three-dimensional pore structure evolution

Acknowledgements The authors are grateful for financial supports provided by the Royal Society of Chemistry Enablement Grant (E21-5819318767) and Royal Society of Chemistry Mobility Grant (M19-2899), National Natural Science Foundation of China (No. 51906110), the Natural Science Foundation of Jiangsu province, China (No. BK20190465). The authors gratefully acknowledge financial support from China Scholarship Council.Peer reviewedPublisher PD