新型炭材料,
2010, 25(2): 109-113.
doi: 10.1016/S1872-5805(09)60019-6
以超临界和亚临界水活化掺金属化合物的酚醛树脂制备球形活性炭
李颖
1,
, 黄正宏
2,
, 康飞宇
state to the Mott-insulator state for such BEC systems are obtained and analyzed, employing both the mean-field approach and the functional-integral method. In particular, we explore the combined effects of three-body interaction and dipole-dipole interaction on the insulating lobes in detail. The experimental scenario is also discussed.","authors":[],"categoryName":"|","doi":"","fpage":"","id":"df182c41-0c48-440d-8f0e-5099d27df78a","issue":"1","journal":{"abbrevTitle":"PRA","id":"4114c0ac-4c3b-4c45-b05e-bc0085e04f53","issnPpub":"1050-2947","publisherId":"PRA","title":"Physical Review A"},"keywords":[{"id":"823973f0-15dd-43e5-b363-35a04b4a715f","keyword":"polar-molecules;ground-state;gases;density;system;gates","originalKeyword":"polar-molecules;ground-state;gases;density;system;gates"}],"language":"en","publisherId":"1050-2947_2010_1_2","title":"Quantum phases of a dipolar Bose-Einstein condensate in an optical lattice with three-body interaction","volume":"82","year":"2010"},{"abstractinfo":"The ground-state magnetic properties of the spin-2 transverse Ising model with a longitudinal crystal field are studied within the framework of mean-field theory (MFT) and effective-field theory (EFT), respectively. The phase diagrams and magnetization curves are examined in detail. It is found that the system exhibits a tricritical behavior in the ground-state phase diagrams. Some interesting phenomena have been found, especially the first-order phase transition from one ordered phase to the other ordered phase, which is due to the high spin. The spin correlation has important effect on the magnetic properties of the system. We also find that the ground-state phase diagrams of the spin-2 transverse Ising model are very different from those of the spin-3/2 transverse Ising model. (C) 2007 Elsevier B.V. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"1151","id":"49aa0918-5383-4402-b79e-2f7cba1a9c9f","issue":"6","journal":{"abbrevTitle":"JOMAMM","id":"5d7a0764-3359-4184-bc25-ad22bbdaf30a","issnPpub":"0304-8853","publisherId":"JOMAMM","title":"Journal of Magnetism and Magnetic Materials"},"keywords":[{"id":"b1729779-0374-475c-ac4e-f6a20bd2db37","keyword":"spin-2 transverse ising model;mean-field theory;effective-field;theory;first-order phase transition;crystal-field;phase","originalKeyword":"spin-2 transverse ising model;mean-field theory;effective-field;theory;first-order phase transition;crystal-field;phase"}],"language":"en","publisherId":"0304-8853_2008_6_3","title":"Ground-state magnetic properties of the spin-2 transverse Ising model","volume":"320","year":"2008"},{"abstractinfo":"The disordered ground-state properties of a double-layer quantum antiferromagnet are investigated in the bond operator representation. The intralayer and interlayer couplings are J and J(perpendicular to), respectively. In a mean-field approximation, we obtain a spin gap which decreases with increasing ratio lambda = J/J(perpendicular to) and disappears at the value lambda(c) = 0.292. In the region O less than or equal to lambda less than or equal to lambda(c), we calculate the disordered ground-state energy, the intralayer and interlayer nearest-neighbour singlet strengths, and the correlation length.","authors":[],"categoryName":"|","doi":"","fpage":"8813","id":"b37b1c4f-086d-4065-a38c-418c7c4e3160","issue":"46","journal":{"abbrevTitle":"JOPM","id":"f0e359df-48a6-4a7f-b16d-2389d3e793ee","issnPpub":"0953-8984","publisherId":"JOPM","title":"Journal of Physics-Condensed Matter"},"keywords":[{"id":"37b22274-0222-4fc6-aa0d-54cda82c7c18","keyword":"superconductivity;la2-xsrxcuo4;dynamics","originalKeyword":"superconductivity;la2-xsrxcuo4;dynamics"}],"language":"en","publisherId":"0953-8984_1995_46_1","title":"DISORDERED GROUND-STATE PROPERTIES OF A DOUBLE-LAYER HEISENBERG-ANTIFERROMAGNET","volume":"7","year":"1995"},{"abstractinfo":"The ground-state magnetic properties of a two-sublattice Ising metamagnet in a mixed longitudinal and transverse magnetic field are studied within the effective-field theory. A parameter j(2) = J(2)/J(1) is introduced, which reflects the strength ratio of spin coupling between adjacent planes and in each plane. In addition to the second-order transition lines, the first-order transition lines are also presented, since the ground-state energy can be calculated numerically. The ground-state phase diagrams in h(x)-h(z) are presented. The results show that when j(2) <0 the phase transition of the system is always first-order for h(x) < 2.751, and when -1000 <= j(2)<0 it is always second-order for h(x) > 4.36. For the given h(x) (0 14.71. There is no fourth-order critical point in the phase diagrams given by using EFT as found by using mean field theory (MFT). (C) 2008 Elsevier B. V. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"2172","id":"8e098175-ae18-4344-9b36-7adc9eaf1094","issue":"17","journal":{"abbrevTitle":"JOMAMM","id":"5d7a0764-3359-4184-bc25-ad22bbdaf30a","issnPpub":"0304-8853","publisherId":"JOMAMM","title":"Journal of Magnetism and Magnetic Materials"},"keywords":[{"id":"4a87655d-fbb9-415e-9146-e12c7229bf4a","keyword":"transverse field;Ising metamagnet;effective-field theory;first-order;transition;second-order transition;multicritical points;monte-carlo;model;behavior;spin","originalKeyword":"transverse field;Ising metamagnet;effective-field theory;first-order;transition;second-order transition;multicritical points;monte-carlo;model;behavior;spin"}],"language":"en","publisherId":"0304-8853_2008_17_1","title":"Ground-state phase diagrams of Ising metamagnet in a mixed longitudinal and transverse magnetic field","volume":"320","year":"2008"},{"abstractinfo":"The ground-state phase diagrams and the magnetization curves of the spin-3/2 transverse Ising model with longitudinal crystal field D are studied within the framework of mean-field theory (MFT) and effective-field theory (EFT), respectively. A simple calculation method of the internal energy is presented within the framework of EFT. In the ground-state phase diagram given by using EFT, the second-order phase transition line is divided into two segments by the first-order phase transition line: one starts from a critical end point and extends to D -> -infinity; the other one starts from a tricritical point and extends to D -> +infinity, while it does not occur in MFT. Some interesting phenomena of the first-order phase transition from one ordered phase to another one ordered have been found. (c) 2007 Elsevier B.V. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"71","id":"ba063fc3-6a96-414e-88de-20eda56c3b5e","issue":"2","journal":{"abbrevTitle":"JOMAMM","id":"5d7a0764-3359-4184-bc25-ad22bbdaf30a","issnPpub":"0304-8853","publisherId":"JOMAMM","title":"Journal of Magnetism and Magnetic Materials"},"keywords":[{"id":"970a4035-2ce9-4f7c-973f-9f95d74bceb4","keyword":"spin-3/2 transverse Ising model;mean-field theory;effective-field;theory;first-order phase transition;crystal-field;phase-transitions","originalKeyword":"spin-3/2 transverse Ising model;mean-field theory;effective-field;theory;first-order phase transition;crystal-field;phase-transitions"}],"language":"en","publisherId":"0304-8853_2007_2_3","title":"Ground-state magnetic properties of the spin-3/2 transverse Ising model","volume":"315","year":"2007"},{"abstractinfo":"By taking into account all the irreducible representations and their components in the electron-phonon interaction (EPI) as well as all the levels and the admixtures of wavefunctions within d(3) electronic configuration, the thermal shifts (TS) of the ground-state zero-field-splitting (GSZFS) due to EPI for ruby have microscopic-theoretically been calculated; the contribution to TS of GSZFS from thermal expansion has also been calculated. The results are in very good agreement with experiments. It is found that the contributions from the first-order perturbation of the second-order term in EPI Hamiltonian are dominant in the Raman term and optical-branch term for TS of GSZFS; the different between the TS due to EPI of t(2)(3 4)A(2) +/-1/2e(2) (G(2)) level and the TS due to EPI of t(2)(3) (4)A(2) +/- 3/2e(2) (G(1)) level gives rise to the TS due to EPI of GSZFS, which is very small in comparison with the TS due to EPI of G(2) or G(1) level. Among various terms in TS of GSZFS, Raman term is the largest one and the signs of the Raman term and optical-branch term are opposite to the sign of the thermal-expansion term; the optical-branch term plays an important role in TS of GSZFS and increases rapidly with temperature; all various contributions to TS of GSZFS have to be taken into account, since the subtle balance among them determines the total result. The comparison between the features of TS of GSZFS and those of TS of R-1 and R-2 lines has been made. For TS of GSZFS, the contribution from thermal expansion is especially important; the neighbor-level term is insignificant.","authors":[],"categoryName":"|","doi":"","fpage":"357","id":"f542ed99-d5aa-4122-b6b0-a803f0a05b9b","issue":"3","journal":{"abbrevTitle":"CITP","id":"45f28bf6-874e-4b98-936f-4562e2c56a77","issnPpub":"0253-6102","publisherId":"CITP","title":"Communications in Theoretical Physics"},"keywords":[{"id":"a257ae0d-60fa-4ba1-9953-7ca2028397c1","keyword":"optical materials;crystal fields;electronic paramagnetic resonance;phonons;thermal expansion;pressure-induced shifts;optical-spectra;mgo-v2+","originalKeyword":"optical materials;crystal fields;electronic paramagnetic resonance;phonons;thermal expansion;pressure-induced shifts;optical-spectra;mgo-v2+"}],"language":"en","publisherId":"0253-6102_2001_3_2","title":"Theoretical calculations of thermal shifts of ground-state zero-field-splitting for ruby","volume":"36","year":"2001"},{"abstractinfo":"The ground state splitting of d(5) configuration ion Mn2+ in ZnS:Mn2+ has been studied by diagonalizing the energy matrices for electron-electron repulsion, spin-orbit coupling and trigonal ligand field interactions. It is shown that in order to give a unified explanation for the EPR parameters a, D and (a - F) for Mn2+ in ZnS:Mn2+, a positive Dq has to be employed. This means that in tetrahedral ZnS the sulfur ion has a positive effective charge. This unusual result supports the Pauling's speculation that the sulfur ion in ZnS may be looked upon as an electron donor that forms a quadricovalent argon state of S2+ with sp(3) hybrid configuration. (C) 2003 Elsevier Ltd. All rights reserved.","authors":[],"categoryName":"|","doi":"","fpage":"2121","id":"3f755251-95db-4537-bcb3-d4f710317965","issue":"11","journal":{"abbrevTitle":"JOPACOS","id":"6268f571-fbc6-4d83-a6ed-a357d820c3df","issnPpub":"0022-3697","publisherId":"JOPACOS","title":"Journal of Physics and Chemistry of Solids"},"keywords":[{"id":"d726db82-ca90-4e8a-a079-f81056a6aa2a","keyword":"electron paramagnetic resonance;site symmetry;ion;zns;spectra;sulfide","originalKeyword":"electron paramagnetic resonance;site symmetry;ion;zns;spectra;sulfide"}],"language":"en","publisherId":"0022-3697_2003_11_1","title":"Analysis of ground-state zero-field splitting for Mn2+ in hexagonal ZnS : Mn2+","volume":"64","year":"2003"},{"abstractinfo":"By means of improved ligand-field theory, the \"pure electronic\" presure-induced shifts (PSs) and the PSs due to electron-phonon interaction (EPI) of the R-1, R-2, B-1, B-2, B-3, and R-3' lines and the ground-state zero-lield-splitting' of ruby have been uniformly calculated. The calculation results are in very good agreement with all the experimental data. At normal pressure, ruby is a crystal with very strong crystal field. Thus the admixture of vertical bar t(2)(2)(T-3(1))e(4)T(2)> and vertical bar t(2)(32)E > bases in the wavefunction of R-1 level of ruby is small at normal pressure, and it gradually decreases with increasing pressure, which causes the R-1-line PS of ruby to monotonously red shift with approximate linearity. The combined effect of the pure electronic PS of R, line and the PS of R, line due to EPI gives rise to the total PS of R, line. The analyses and comparisons among the features of R-1-line PSs of three laser crystals (ruby, GSGG:Cr3+ and GGG:Cr3+) have been made, and the origin of their difference has been revealed.","authors":[],"categoryName":"|","doi":"","fpage":"941","id":"fb62d460-9feb-4a5c-bc4e-c71fdd67fa8e","issue":"5","journal":{"abbrevTitle":"CITP","id":"45f28bf6-874e-4b98-936f-4562e2c56a77","issnPpub":"0253-6102","publisherId":"CITP","title":"Communications in Theoretical Physics"},"keywords":[{"id":"4e607ff8-147d-4982-a5b7-60ff6f7c4839","keyword":"high-pressure effect;electron-phonon interaction;R;R ';and B;line-groups;ground-state zero-field-splitting;admixture of;[t(2)(2)(T-3(1))e(4)T(2)) and [t(2)(3)(2) E);laser crystal;calibration;spectra","originalKeyword":"high-pressure effect;electron-phonon interaction;R;R ';and B;line-groups;ground-state zero-field-splitting;admixture of;[t(2)(2)(T-3(1))e(4)T(2)) and [t(2)(3)(2) E);laser crystal;calibration;spectra"}],"language":"en","publisherId":"0253-6102_2005_5_1","title":"Pressure-induced shifts of R,R ', and B line-groups and ground-state zero-field-splitting of ruby","volume":"43","year":"2005"},{"abstractinfo":"The spatial structure of dusty plasma confined in a spherical microcavity has been investigated by use of the density functional theory for classical fluids, in which all particles undergo an isotropic harmonic potential and the interparticle interaction is described by the hard-core Yukawa potential. The fundamental measure theory of Rosenfeld and its modified versions have been used in the energy functional to incorporate hard-core interactions between particles. Based on the variational principle, the equilibrium density profile can be obtained by use of an iteration calculation with the average density of particles as an input. In terms of density profiles presented under various conditions, the roles of the trapped parameter, coupling parameter, screening parameter, and the average number density of particles are discussed, and significant influences of these factors on the structure of confined dusty plasma are found.","authors":[],"categoryName":"|","doi":"","fpage":"","id":"fb29e543-3ef0-46e6-bf04-e2fe1490b823","issue":"5","journal":{"abbrevTitle":"PRE","id":"6f396c2a-e77a-4696-abf2-08892b0508c0","issnPpub":"1539-3755","publisherId":"PRE","title":"Physical Review E"},"keywords":[{"id":"3a3a6dde-3b6c-4b4f-850e-30d491200d84","keyword":"fundamental-measure-theory;hard-sphere fluid;coulomb-crystal;shell;structure;yukawa balls;particles;clusters","originalKeyword":"fundamental-measure-theory;hard-sphere fluid;coulomb-crystal;shell;structure;yukawa balls;particles;clusters"}],"language":"en","publisherId":"1539-3755_2012_5_1","title":"Density functional theory for the ground state of spherically confined dusty plasma","volume":"85","year":"2012"},{"abstractinfo":"We investigate a dilute Bose gas confined in a tight one-dimensional (1D) optical lattice plus a superimposed random potential at zero temperature. Accordingly, the ground-state energy, quantum depletion, and superfluid density are calculated. The presence of the lattice introduces a crossover to the quasi-two-dimensional (2D) regime, where we analyze asymptotically the 2D behavior of the system, particularly the effects of disorder. We thereby offer an analytical expression for the ground-state energy of a purely 2D Bose gas in a random potential. The obtained disorder-induced normal fluid density n(n) and quantum depletion n(d) both exhibit a characteristic 1/1n(1/n(2D)a(2D)(2)) dependence. Their ratio n(n)/n(d) increases to 2 compared to the familiar 4/3 in lattice-free three-dimensional (3D) geometry, signifying a more pronounced contrast between superfluidity and Bose-Einstein condensation in low dimensions. The conditions for possible experimental realization of our scenario are also proposed.","authors":[],"categoryName":"|","doi":"","fpage":"","id":"c616bc93-2126-4924-887f-d862c179ca6b","issue":"4","journal":{"abbrevTitle":"PRA","id":"4114c0ac-4c3b-4c45-b05e-bc0085e04f53","issnPpub":"1050-2947","publisherId":"PRA","title":"Physical Review A"},"keywords":[{"id":"29a55466-0edc-44c6-b9dc-32839c38a895","keyword":"long-range order;continuous symmetry group;2-dimensional systems;einstein condensation;mott insulator;2 dimensions;bosons;destruction;transition;lattices","originalKeyword":"long-range order;continuous symmetry group;2-dimensional systems;einstein condensation;mott insulator;2 dimensions;bosons;destruction;transition;lattices"}],"language":"en","publisherId":"1050-2947_2010_4_2","title":"Optically trapped quasi-two-dimensional Bose gases in a random environment: Quantum fluctuations and superfluid density","volume":"82","year":"2010"}],"totalpage":463,"totalrecord":4622}
