Search results

Because of the more exist in molecular structure, nylon fibers are readily hydrolyzed.
Inappropriate acidic conditions may cause changes in the structure of fibers, damage the fibers, and poor the mechanical properties.
Vol. 23(2007), p.185-187 [14] CHEN Shengfu, HUANG Jian, ZENG Tao, et al: Guangzhou chemistry.

Its structure is very similar to sildenafil, except vardenafil contains a slightly different purine-isostenc imidazole [5,1-f] [1,2,4]-4(3H) - one heterocyclic core.
It is distinctly different from sildenafil and Vardenafil with a tetrahydroβ-carbolinium structure as the parent nucleus.
Chinese Journal of Synthetic Chemistry，2001，9（6）：443-556

Effective Synthesis and Isomerization of Cyclotetrasiloxanetetraol Hisayuki Endoa and Masafumi Unnob Department of Chemistry and Chemical Biology, and International Education and Research Center for Silicon Science, Graduate School of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu 376-8515, Japan at12802101@gunma-u.ac.jp, bunno@gunma-u.ac.jp Keywords: stereoisomerization, silsesquioxane, selective synthesis, silanol Abstract.
Introduction During the last decade, we have reported the syntheses of a variety of silsesquioxanes including up to nonacyclic laddersiloxanes and various cage silsesquioxanes whose structures had been determined [1].
Although our results or Kawakami's report did not show the proof of all-cis structure, we presume that the stereostructure is all-cis-[i-BuSiO(OH)]4 because of the fact that all the cyclic silanols prepared in the similar methods gave only all-cis isomers [2–4].

Introduction X-ray diffraction (XRD) analysis, first method to investigate the microstructure of a material, has been applied in physics, chemistry, earth science, materials science and so on.
It is an important experimental method and the way to analyze the structure of a material, while it can not damage the specimen.[1,2] The diffractometer is composed of X-ray generator, goniometer, X-ray detector, light-path system, controlling and data treatment systems and attachments etc.
Liang, Powder diffraction method of crystal structure, first ed., Science press, Beijing, 2003

High silica MFI zeolite membrane was synthesized by hydrothermal method at 313 K on asymetri pore structure alpha alumina substrate, utilizing natural rice husk as the sources of silica.
The membrane structure was identified by X-ray diffraction (XRD).
Membrane structure was identified by using X-ray diffraction (XRD) using Cu K α radiation (Simadzu XRD-6000).
Hydrothermal Chemistry of Zeolites.

The latter phase has another advantage over other mono-nitrides: it is a line compound due to its crystal structure (non-Hägg compound), see EPMA scan across the two-phase tip of the wedge-type sample Fig.17.
Lengauer, Carbides: Transition metal solid-state chemistry, in: Encyclopedia of Inorganic and Bioinorganic Chemistry, ed.
Lengauer, Nitrides: Transition metal solid-state chemistry, in: Encyclopedia of Inorganic and Bioinorganic Chemistry, ed.

It is obvious, that all they do not have one and the same simple structure.
However, the random network structure model, first proposed by Zachariassen [1], can serve as the generalizing model of their structure.
The regular network with a-quartz structure was used as 3-D initial network.
Wright, The Structure of Simple Glasses: Randomness or Pattern—the Debate Goes On, Glass Physics and Chemistry, 24 (1998) 148-179
Henderson, The structure of silicate melts: A glass perspective, Can.

Experiments The field of material and intelligent structures is interdisciplinary between science and technology and combines the knowledge of physics, mathematics, chemistry, computer science and the material, electric and mechanical engineering.
As a strategy of accomplishing the equipment for identifying and monitoring the personalized information, the following textile structure variants were chosen: - structures which are woven and/or knitted from yarns properties specific for ensuring the physiologic comfort, used as a flexible support for the sensor attaching; - structures which are woven and/or knitted from HiTech fibres with conductive properties.
From viscose and elastane yarns there was accomplished a plain structure to which the elastane yarn was laid as supplementary yarn by plating, on a section rotary knitting machine with a large diameter.
ec 1 ei ec 2 el Fig. 2 The constructive structure of a resistive sensor; ce 1,2 - elastic carbon elements , ie- insulating elements, ce-connection electrodes.
The resistive sensor made of spongious carbon with a good conductivity has a structure formed of elastic carbon elements, insulating elements and connection electrodes (fig. no. 2).

Introduction A number of failures of large concrete structures during construction have been reported in the last decades [1].
Consequently, reliable information about early age properties of the material is essential to guarantee life-time performance of structures.
Gel constitutes the major phase in the hardening cement paste and the corresponding structure and dynamics represent an important contribution to determine the concrete performance.
H.F.W.: Cement Chemistry (2nd.

The structure and morphology of CNTs /Fe3O4/ PANI were characterized by transmission electron-microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and fourier transform infrared (FTIR) spectroscopy.
The CNTs/Fe3O4/PANI nanocomposites exhibit less intertwined structure and that many more Fe3O4 particles are attached homogeneously on the surface of CNTs, indicating that PANI can indeed help CNTs to disperse in isolated form.
Various chemistry-based processing routes have been developed to synthesize iron oxide/CNTs nanocomposite.
What’s more, the facile preparation, structure characterization, and wave absorption performance of CNTs/Fe3O4/PANI nanocomposite materials were investigated.
However, the CNTs/Fe3O4/PANI samples exhibit less entangled structure due to the wrapping of PANI.