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Their structures were characterized by IR, 1H NMR, 13C NMR, MS, HRMS, etc.
Introduction Although many drugs are available for the treatment of fevers and pains, nonsteroidal compounds with new structures, higher potencies and lower toxicity are still one of the popular research fields in medicinal chemistry [1].
According to the bioisosterism principle in medicinal chemistry [5], 1H-3,4-dihydropyrrolo[1,2-a]-pyrazin-1-one, 1H-3,4-dihydropyrrolo[1,2-c][1,4]oxazin-1-one and their 7-aroyl derivatives reasonably similar to 3H-1, 2-dihydropyrrolizine compounds in molecular structures and chemistry properties, maybe have similar antipyretic and analgesic activities.
This played very important roles in our structure-activity study of them and the structure-alike compounds.
Bioorganic & Medicinal Chemistry Letters, 2009, 19(3), 990-994

SENHADJI2,d 1Laboratory Geo-materials (LDMM), Civil Engineering Department, University of Djelfa, Algeria. 2Department of Civil Engineering, Laboratory of Materials, ENPO, Oran, Algeria. 3Faculty of Science, Laboratory of Polymer Chemistry, University of Oran, Es-Senia, Algeria. 4Department of Chemistry, Preparatory School of Science and Technology EPST, Tlemcen, Algeria.
In recent years, the rapid deterioration of various reinforced concrete structures has been widely recognized as worldwide problem.
Acidic environments are very aggressive to concrete structures, as well as promote their degradation.
Mortar Composites modified with PET waste are often used as low-cost materials for preventing chemical attacks or repairing various reinforced concrete structures damaged by chloride-induced corrosion, as well as in structures exposed to aggressive environments where high resistance to acid [5, 15] is required.

The reason was partly due to the formation of intercalated and exfoliation nanocomposite structure at this clay content and stronger interaction of O-Mica with polymer matrix.  
It composed of monoclinic structure with a very high layer charge density 2e in half unit cell [O20(OH)4] and and has homogenous charge distribution [9].
Fig.2 shown TEM micrographs of nanocomposites structure and clay organization in the matrix containing 3wt% of organoclay.
The formations of intercalated and exfoliated structure of clay layer (as shown in Fig.3) cause an increased of Tc and decreased crystalline phase of nanocomposites.
Yu: Journal of Solid State Chemistry Vol. 179 (2006), p. 1525

The structures in the microchannel can provide specific functions such as micromixers [2, 14, 15].
This process can produce true three dimensional structures in the channel.
Table 3 Comparison of various micro-structure manufacturing processes.
Analytical and Bioanalytical Chemistry, 390,(2008) 89-111
Analytical Chemistry, 75,(2003) 5381-5386.

Its structure is similar to 1,3,5-triamino-2,4,6-trinitrobenzene(TATB)(Fig. 1(b)).
The energy and sensitivity of ANPyO was found close to TATB through quantum chemistry calculation[2].
(a) (b) Fig. 1 Molecular structure of ANPyO(a) and TATB(b) Therefore, we calculated the detonation parameters of ANPyO and synthesized ANPyO and its Copper and Nickel complexes.
In addition, the factor F depends solely upon the chemical composition and molecular structure
Wenbin, Physical Chemistry(The third edition), Higher Education Press, Beijing, 1955.

Fröberg Åbo Akademi University, Process Chemistry Group 20500 Åbo/Turku, Finland Keywords: glaze, durability, Abstract.
In silicate glasses the principal mode of acid attack is reported to be an ion exchange reaction of modifying ions in the glass structure by H + ions of the acid solution.
The glaze structure can vary from glossy, homogeneous glazes to mat glazes consisting of several different crystalline phases embedded in a glassy matrix.
The firing of the glaze will also influence the final surface structure thus complicating the prediction of chemical durability directly from the chemical composition suggested by the starting raw materials.
The work is also a part of the activities of Åbo Akademi Process Chemistry Group, a National Centre of Excellence appointed by the Academy of Finland.

However, BARC was unable to fill high aspect ratio structure properly, leading to voids that will influence the patterning performance.
SOG can be opened using the plasma of fluorine based chemistries, while SOC can be patterned by plasma oxygen-based chemistries (CO, CO2, SO2, O2/N2).
It is essential to remove the SOC film selectively to HfO2, TaN, and TiN, which are WFM of RMG structure.
k ≈ 5.79×105 exp (-34000/RT) (6) Figure 6 shows the loss rate of HfO2, TaN, and TiN film, which are WFM of RMG structure.

Synthesis, properties and application in optical memory of a photochromic diarylethene based on benzene ring Ming Liu, Renjie Wang, Gang Liu* Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University Nanchang 330013, P.
The structure of 1a was characterized by 1H NMR. 1H NMR (400 MHz, CDCl3, ppm): δ 1H NMR (400 MHz, CDCl3, TMS): δ 2.02 (s, 3H, -CH3), 6.87(s, 1H, thiophene-H), 7.46 (t, 1H, benzene-H), 7.59 (t, 2H, benzene-H, J = 8.0 Hz), 7.66 (m, 2H, benzene-H, J = 8.0 Hz), 7.72 (m, 2H, benzene-H, J = 8.0 Hz).
Irie: Chemistry Letters Vol. 32(2003), p. 1078 [2] BL.

Fabrication of Polyvinylpyrrolidone/Boehmite Nanofibers by Electrospinning Zhijie Wang1, Jinghua Gong1, Shuguang Yang1, Jinghong Ma1, a* and Jian Xu1,2, b* 1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Material Science and Engineering, Donghua University, Shanghai 201620, China 2Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China amjh68@dhu.edu.cn, bjxu@iccas.ac.cn Keywords: Boehmite, PVP, Nanofibers, Electrospinning.
The morphology and the structure of these composite nanofibers have been investigated.

Synthesis，Properties and Application in Optical Memory of a New Photochromic Diarylethene Based on a Chlorine Atom Zhipeng Tong, Gang Liu*, Shiqiang Cui Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, P.R.China liugang0926@163.com Keywords: Diarylethene; Photochromism; Fluorescence; Optical storage.
The structure of compound 1a was confirmed by 1H NMR(400 MHz, CDCl3): δ 2.09 (s, 3H, -CH3), 2.13 (s, 3H, -CH3), 2.24 (s, 3H, -CH3), 7.24 (s, 1H, thiophene-H), 7.30 (d, 2H, phenyl-H), 7.48 (t, 2H, J=3.0Hz, phenyl-H).
The Royal Society of Chemistry. (2002), p. 1060