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Search Results: 1 - 10 of 19726 matches for " Qibing Chang "
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Separation of Kaolinite from Ion-Adsorption Rare Earth Tailings in Southern China and Iron Removal Treatment  [PDF]
Yongqing Wang, Huayin Liang, Qibing Chang, Xiaozhen Zhang, Jian’er Zhou
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2016, DOI: 10.4236/jmmce.2016.41005
Abstract: Several hundred million tons of ion-adsorption rare earth tailings exist in Ganzhou, Southern China, which is a severe environmental hazard. To reduce and reutilize the tailing, kaolinite has been separated from the tailings by mechanical separation in laboratory scale and pilot scale. The results show that the tailing is mainly composed of fine kaolinite and coarse quart. Quartz and kaolinite can be separated by sieves, shaker, spiral chute or hydrocyclone, which has the similar results in laboratory scale and pilot scale. 30.2% of the tailings can be re-sourced and applied in ceramic industries. 41.7% of kaolinite can be obtained after sorting and iron removal by magnetic separator in pilot scale, which can be applied in ceramic industries according to the Chinese national standard (TC-3). The results give a progressive solution to re-source the tailings economically.
Characterization and Iron Removal Treatment of Ion-Adsorption Rare Earth Tailings in Southern China  [PDF]
Yongqing Wang, Xin Nie, Qibing Chang, Huayin Liang, Xiaozhen Zhang, Jian-Er Zhou
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2016, DOI: 10.4236/jmmce.2016.42012
Abstract: The ion-adsorption rare earth tailings have become a serious environmental pollution in Southern China, yet the potential of their economical value has not been fully exploited. In this work, the chemical and mineral compositions of the ion-adsorption rare earth tailings were characterized by Mineral Liberation Analyze (MLA) and XRF. The results show that 91.98 wt% of the tailings are composed of kaolinite and quartz, latter of which was removed by the sieving method. The other minor minerals contain feldspar, biotite, muscovite, titanomagnetite and limonite. Amongst these, the iron-bearing minerals are mostly found in the titanomagnetite and limonite which can be mostly removed by using a periodic high-gradient magnetic separator with a magnetic induction of 0.6 Tesla. The Fe2O3 content of the tailings changed from 2.11 wt% to 1.06 wt% after the sorting process, which met the Chinese national standard of TC-3 grade raw materials for ceramic industry applications. The Fe2O3 content in kaolinite was further decreased after Na2S2O4 treatment.
Graphs and the (co)homology of Lie algebras
Qibing Zheng
Mathematics , 2011,
Abstract: In this paper, we develop a diamond graph theory and apply the theory to the (co)homology of the Lie algebra generated by positive systems of the classical semi-simple Lie algebras over the field of complex numbers. As an application, we give the weight decomposition of the diamond Lie algebra with Dynkin graph $A_{n+1}$ and compute the rank of every weight subgraph of it.
A generalization of Kostant theorem to integral cohomology
Qibing Zheng
Mathematics , 2013,
Abstract: In this paper, we find weight decomposition and rank of a weight in the integral (co)homology of the positive system of a semi-simple Lie algebra over $\Bbb C$ and prove that the (co)homology of the weight subcomplex over a field of characteristic p is 0 if the rank of the weight is not divisible by p. This generalizes Kostant theorem to the integral cohomology of the positive system.
The cohomology algebra of polyhedral product spaces
Qibing Zheng
Mathematics , 2012,
Abstract: In this paper, we compute the cohomology ring of all homology split polyhedral product spaces and the cohomology algebra over a field of all polyhedral product spaces. As an application, we give two polyhedral product spaces such that all the cohomology homomorphisms induced by inclusion map are the same, but the cohomology ring of the two polyhedral product spaces are not isomorphic.
A Homeomorphism Invariant of Polyhedra
Qibing Zheng
Mathematics , 2011,
Abstract: In this paper, we define a new bigraded L-homology on finite simplicial complexes and prove that L-homology is a homeomorphism invariant of polyhedra.
The homology coalgebra and cohomology algebra of generalized moment-angle complexes
Qibing Zheng
Mathematics , 2012,
Abstract: In this paper, we compute the homology coalgebra and cohomology algebra over a field of all generalized moment-angle complexes and give a duality theorem on complementary moment-angle complexes.
Preparation and characterization of porous YSZ--Al{2}O{3} composite membrane

CHANG Qibing DONG Qiang LIU Xingqin MENG Guangyao,

材料研究学报 , 2004,
Abstract: YSZ--Al$_{2}$O$_{3}$ composite membranes with different composition were introduced to reduce the stress occurred during heat treatment, which could make the membrane have defects and microcracks. The degree of components and the thickness of the composite membrane were considered simultaneously. The data showed that linear expansion coefficient and sintered shrinkage increased with the increase of YSZ content. The sintered shrinkage was an important factor to choose the composition. Two composite membranes with 20\% (volume fraction) and 80\% of YSZ content were prepared. And the pore sizes of two composite membranes are 0.72 $\mu$m and 0.36 $\mu$m, respectively. The composite membrane is an excellent microfiltration membrane and a support for the preparation of YSZ ultrafiltration membrane and nanofiltration membrane.
The homology of simplicial complement and the cohomology of the moment-angle complexes
Xiangjun Wang,Qibing Zheng
Mathematics , 2010,
Abstract: A simplicial complement P is a sequence of subsets of [m] and the simplicial complement P corresponds to a unique simplicial complex K with vertices in [m]. In this paper, we defined the homology of a simplicial complement $H_{i,\sigma}(\Lambda^{*,*}[P], d)$ over a principle ideal domain k and proved that $H_{*,*}(\Lambda[P], d)$ is isomorphic to the Tor of the corresponding face ring k(K) by the Taylor resolutions. As applications, we give methods to compute the ring structure of Tor_{*,*}^{k[x]}(k(K), k)$, $link_{K}\sigma$, $star_{K}\sigma$ and the cohomology of the generalized moment-angle complexes.
Simplicial Homeology and Homeotopy
Qibing Zheng,Feifei Fan
Mathematics , 2011,
Abstract: In this paper, we define homeology group, reduced homeology group, cohomeology group and reduced cohomeology group on finite simpicial complexes and prove that these groups are homeomorphism invariants of polyhedra. We also define homeotopy type of polyhedra which is finer than homotopy type but coarser than homeomorphism class.
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