Search results

MEMs/NEMs have demonstrated their unique advantages when they are combined with chemistry and biology, including fast, real-time responses.
Since the cantilever structures are small they execute thermal motion (Brownian motion) in air and liquid.
Many microcantilever biosensors are based on surface conjugation chemistry.
Polymer Hydrogels, composed of a solid and a liquid phase, are networked structures of polymer chains crosslinked to each other and surrounded by an aqueous solution.
Thomas, Recent Research Development in Chemistry, in press, 2005.

Structure Identification.
The structure of Saponin was shown in Fig.1.
Jimenez: Food Chemistry Vol.97 (2006), p.137-150
Food Chemistry Vol. 54 (2006), p.779-784
Jiang: J. of Agri.and Food Chemistry Vol. 56 (2008), p. 7517-7521

Lee, Chemistry of cement and concrete, transl. from English by B.S.
Kurdowski, Chemistry of cement and concrete, Warsawа, 2010
Backman, On the phase chemistry of Portland cement clinker. (2015) 50–60
Rebinder, Appearance of setting crystallization structures and develioment conditions of their strength, іn: Novelties in cement chemistry and process engineering, Moscow, (1962) 202-213
Skorik, Analysis of plasticizer effectiveness during alkaline cement structure formation. (2017) 35-41.

Through the use of IR spectrum and TG-DTA, this paper analyzes the asphaltene structure and thermal analysis before and after the catalytic aquathermolysis reaction, and the result shows some changes in the heavy component structure in the asphaltene after the reaction, a reduction in some unsaturated structures, an increase in saturated structures, a reduction in long-chain structures, an increase in short-chain structures, and an increase in light components.
Asphaltene structure analysis in heavy oil.
Conclusion (1) To use the self-made oil-soluble catalyst for aqauthermolysis reaction on heavy oil, from the analysis on the asphaltene structure in heavy oil before and after the reaction by IR spectrum, we can find a reduction in some unsaturated structures, an increase in saturated structures, an increase in mass fraction of light components, a reduction in long-chain structures, and an increase in short-chain structures.
The chemistry and physics of petroleum asphaltenes Part Ⅲ (The study methods of chemical structure of asphaltenes [J].Petroleum Asphalt, 1995 , 9(4):32-38
Study on thermal cracking for Liaohe heavy oil during steam soak [J].Oilfield Chemistry, 2007, 24(1):19-23.

The structure and energetics of different liquid metals just above their melting points are much more similar to each other [1], even if the mathematical description of their structure is obviously more complicated than that of ideal (and therefore not real) solid crystals.
Gold in solid state has an fcc structure with no allotropes at 1 bar, Tm = 1,338 K, U o coh(s,0K) = -368.0 kJ/mol (calculated from Eq
In this way, the cohesion energy of two solid metals with the same melting point, but different structures will be different, as the melting entropy (being the part of Eq-s.(2-3)) is a structure sensitive property.
[9] E.Berecz, Physical Chemistry, Tankönyvkiadó, 1988 [10] P.W.Atkins, Physical Chemistry (Hungarian translation), Tankönyvkiadó, 1992 [11] D.L.Beke, G.Erdélyi, F.J.Kedves, J.Phys.Chem.Solids, 42 (1981) 163 [12] D.L.Beke, Defect and Diffusion Forum, 66-69 (1989) 127 [13] I.
Symp. on Molten Salt Chemistry and Technology, ed. by Chen Nianyi and Qiao Zhiyu, Shanghai University Press, 2001, 182-185.

Mechanism of High-Carbon Paraffin Deposition and Preventing Methods Fusheng Zhang1,a , Jian Ouyang1,b, Dewei Wang2,c and Xinfang Feng1,d 1 Oilfield Chemistry Key Laboratory, CNPC (Research Institute of Petroleum Exploration and Development, PetroChina), 20 Xueyuan Road, Haidian district, Beijing 100083, China 2 Jinzhou Oil Production, Liaohe Oilfield Company, Petrochina, Liaoning Linghai 121209, China a zhfsh@petrochina.com.cn, b ouyj@petrochina.com.cn, c wdw691225@163.com, d fxf@petrochina.com.cn Keywords High-carbon paraffin, Paraffin inhibiting, Wettability, Paraffin crystals structure Abstract.
It is found that the paraffin inhibitor can prevent paraffin crystal from forming 3D network structure by modifying its structure, and mitigate paraffin deposition by changing the wettability of paraffin deposition surface.
Modifying paraffin crystals structure.
For the crude oil not treated by inhibitor, paraffin crystals easily form diamond plate-type structure, which has huge specific surface energy, and at last form spatial network structure, since interaction of paraffin crystals is strong, accumulation and bonding is easy.
Oilfield Chemistry, Vol.12, No.2, pp.113-116, 1995

Correlation of Mechanical Properties of Cast Al 3xx Alloys to Processing Variables and Alloy Chemistry Using Regression Analysis and Artificial Neural Network Techniques Daryoush Emadi 1,a and Musbah Mahfoud 2,b 1 Materials Engineering Department, McGill University, Montreal, Quebec, Canada 2 Department of Materials Engineering, Tripoli University, Tripoli, Libya a daryoush.emadi@mcgill.ca , b m_mahfoud@hotmail.com Keywords: mechanical properties; aluminium, 3xx alloys, artificial neural network; regression analysis.
The results indicate that ANN is a suitable technique for predicting mechanical properties from alloy chemistry and processing variables.
The mechanical properties of cast alloys can be improved by controlling the alloy chemistry as well as casting and heat treatment variables.
General structure of an ANN model.

Under optimized condition, highly-ordered pores structures can be obtained in the domains.
The other two pairs of spots at outside reveal that there are regular structures with smaller periodicities.
These significant big domain structures have only been observed on annealed aluminum substrates.
Metzger, Chemistry of Materials 1998, 10, 2470
Metzger, Chemistry of Materials 1999, 11, 1949.

The structures of Eumelanins and pheomelanins are examined by solid-state NMR and EPR.
GC-MS can be used to characterize the structure type of melanin.
Food Chemistry, 111, 745−749.
[3] Prota, G: Progress in the chemistry of melanins and related metabolites.
[21] Ito, S: Reexamination of the structure of eumelanin.

The study of the microstructure helps to clarify and to understand the way of contaminants interception in structure of S/S product.
The advantage of the ettringite is its flexible structure that allows easy incorporation of toxic elements into a stable structure that is almost insoluble in water [3].
Also a dense structure of S/S process product without cracks and pores is apparent on the picture at the low magnification.
The SEM images showed the micro structure of S/S product without pores and cracks and with the ettringite as main hydration product.
Havlica: Imobilizace odpadních iontů ve struktuře ettringitu (Waste immobilization of ions in the structure of ettringite), Department of Material Chemistry, Faculty of Chemistry, Brno University of Technology, In Chemistry,Biology, Physics and Technology Bulletin of the Czech and Slovak Crystallographic Association RPDK 98,1998, pp 47 – 48