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Microhardness of a multicomponent material can be frequently calculated on phase structure on the basis of additivity on microhardness of separate components iΗµ and their relative contents in the total bulk of a material on the following dependence ∑ = = n i ia i мат 1Η Η µ µ , (2) Here iΗµ is microhardness of a phase component of ferrite, cementite, hematite and magnetite, calculated under the formula (1); ia is the relative contents of all phase components in the bulk of a powder.
Povarennykh: Crystal-chemistry theory of hardness.

Study of Microfluidic Chip with In-situ Prepared Chitosan Membrane Immobilized with Glucose Oxidase Cao Qiang1, 2, 3, 4, a，Xu Yi1, 2, 3, 4, b, Song Defu 1, 2, 3, 4，Han Weiwei1, 2, 3, 4， Dong Xizhe1, 2, 3, 4 1 Key Disciplines Lab of Novel Micro-nano Devices and System Technology 2 International R & D center of Micro-nano Systems and New Materials Technology 3 Microsysten Research Center 4 Chemistry and Chemical Engineering College, Chongqing University, Chongqing , 400030, P.R.China a tianmao6971@163.com, b xuyibbd@sina.com Keywords:Chitosan, Immobilized glucose oxidase reactor, Microfluidic chip , Chemiluminescence detection Abstract.
Schematic of the microfluidic chip structure lay-out；Photograph of the microfluidic chip） Tab 1.

Mullite can accommodate a variety of transition metal ions into its structure as a solid solution.
In order to follow structural and chemical changes from gel to final mullite material as-prepared and thermally treated gels were studied by the following techniques: Differential thermal analysis (DSC-TG) was carried out in air, using a heating rate of 10 ◦C /min, operated in Intermediate Laboratory of Chemistry, Peking University.

Nanosized Silicon Carbide Obtained from Rice Husks Dimitar Radev, Ivan Uzunov Institute of General and Inorganic Chemistry, BAS "Acad.
Introduction Great deal of interest has been created among the materials scientists in developing structure of materials of specific nanomorphologies [1].

Synthesis and Properties of A Novel Photochromic Diarylethene 1-(2,4-dimethyl-5-thiazolyl)-2-[2-methyl-5-(4-formylphenyl)-3-thienyl]perfluorocyclopentene Xiaoting Li, Hui Li and Shiqiang Cui* Jiangxi Key Laboratory of Organic Chemistry,Jiangxi Science and Technology Normal University Nanchang 330013, P.R.
The structure of compound 1o was confirmed by 1HNMR.

In particular, the pottery stone is composed mainly of quartz and sericite, and has been used as a useful raw material for porcelain.[1][2] Also, sericite is used as a raw material in the synthetic chemistry, the electrical and electronic area mainly to study an insulator, and the paper industry.
Sericite is used as a raw material in paints, pigments, medical supplies, cosmetics, textile industry etc, because sericite is composed of minute particles and has the structure like plate phase, so that it is easy to coat something.

After chemical reduction, GO nanosheets are reduced to graphene nanosheets and restored to an ordered crystal structure.
Bokros, Chemistry and Physics of Carbon, Marcel Dekker Inc., New York, 1969

With intense heat and mass transfer process, the complex chemistry reactions between rising reducing gases and descending charges make the matter flowing speed, gaseous-solid phase ingredient and temperature be heterogeneous both along axial direction and radial direction; additionally process being high temperature state, the directly observation of process parameters can not be realized[5].
At present, some problems exists in double BF such as fuel quality of burden structure was unsteady and lower grade; the precision of charging and burden distribution was inadequate and gas flow was unstable.

Preparation of Cu2O-TiO2 nanocomposite in ethylene glycol system and its photocatalytic activity under visible light irradiation LI Long-fenga, ZHANG Mao-linb School of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, China alfli9469@163.com, b corresponding author. mlzhang1268@163.com Keywords: Cu2O-TiO2, preparation, ethylene glycol, photocatalytic activity.
Resultly, the amorphous hydrous titanium oxide precursor TiO2·nH2O was obtained, and then the autoclave was heated up to 200 ℃ and hold at this temperature for 10 hrs, and the amorphous precursor was transformed into the nano-sized TiO2 with stable crystal structure.

One import field of application of diatomite is used as adsorbent to remove metal ions basing on its porous structure, low density, high surface area, chemical inertness and being sterile [8].
Allen, Mechanisms and chemistry of dye adsorption on manganese oxides-modified diatomite, Environ.