Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: April 2016
Authors: Bretislav Cesek, Jan Gojný, Miloslav Milichovský
Mutual Absorption of Water and Essential Oils Vapours by Lignocellulosic Material – Verification of Measured Data Bretislav Cesek1, a *, Miloslav Milichovsky1,b and Jan Gojny1,c 1University of Pardubice, Faculty of Chemical Technology, Institute of Chemistry and Technology of Macromolecular Materials, Department of Wood, Pulp and Paper, Studentska 95, CZ 532 10, Pardubice, Czech Republic aBretislav.Cesek@upce.cz, bMiloslav.Milichovsky@upce.cz, cJan.Gojny@upce.cz Keywords Lingocellulosic materials, essential oils, porous materials, vapour absorption Abstract Competitive absorption process, i.e. condensation of water and essential oils (EO) are predominantly controlled by extent of condensation of diffusing water and EO molecules with marginal influence of porous lignocellulosic matter and a sort of EO.
Typical for lignocellulosic materials as paper is a porous non-oriented hypermolecular structure.
Due to this structure and hydrophilic surface-molecular character of pore interface, ability to humidification with characteristic water and EO vapours absorption kinetic [3] is typical for these materials.
The porosity of paper material and its structure combined with the properties of pore interfaces appear to be the most important properties influencing hygroscopicity and EO absorptivity.
Online since: July 2011
Authors: You Ru Du, Yi He, Xiao Bo Liu
Synthesis, characterization and properties of polyesteramides based on ε-caprolactone and 6-aminocaproic acid Yi He 1, a, Youru Du2, b, Xiaobo Liu 3,c 1 State Key Lab of Oil and Gas Reservoir Geology and Exploitation,(Southwest Petroleum University)Rd. 8, Xindu District, Chengdu City, Sichuan Province, P.R.China, 610500 2Institute of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, China 3Key Laboratory of Electronic thin Films and Integrated Devices,University of Electronic Science and Technology Chengdu City, Sichuan Province, china a13881958071@163.com, bduyouru2008@163.com, cliuxb@uestc.edu.cn Keywords: Biodegradable polyesteramides, Thermal property, Mechanical properties, Thermal degradation Abstract.
The one-stage degradation pattern suggest that the structure of P(CL/AC)60/40 and P(CL/AC)40/60 polyesteramides could be random.
The two-stage degradation pattern suggest that the structure of P(CL/AC)50/50 polyesteramide could be partially blocky.
The structure includes PCL-rich phase and PAC-rich phase.
Online since: November 2012
Authors: Maria L.P. da Silva, Roberto R. Lima, Leonardo F. Hernandez, Edson Pecoraro, Esteban Rosim-Fachini
It is possible to observe conjugate bands in the 1300-1600 cm-1 range, which shape is consistent with graphite structure; however, peaks at 1500 cm-1 can also be assigned to silicone and the peak at 1420 cm-1 for sample #5 seems to indicate a CH2 radical.
Since the plasma polymerized material is not an ordered structure with a well defined molecule composition, it was not possible to determine precisely which peak corresponds to each functional organic group.
Collinson, Analytical Chemistry with Silica Sol-Gels: Traditional Routes to New Materials for Chemical Analysis, Annu.
P. da Silva, Large surface area of HMDS plasma polymerized thin film used for production of miniaturized structures, Mat.
Online since: May 2010
Authors: Wen Jiang Ding, Bi Yu Tang, Dong Lin Li, Ping Chen, Jian Xiong Yi, Li Ming Peng
Thermal Properties of the FCC Al3Zr : First-principles Study Dong-Lin Li1,a, Ping Chen1,b, Jian-Xiong Yi1,c, Bi-Yu Tang *,1,2,d, Li-Ming Peng3,e,Wen-Jiang Ding3,f 1 Key Laboratory of Low Dimensional Materials & Application Technology of Ministry of Education, Department of Physics, Xiangtan University, Hunan Province, 411105, China 2 School of Chemistry and Chemical Engineering, Guangxi University, Nanning, 530004, China 3 Light Alloy Net Forming National Engineering Research Center, School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China *Corresponding author (Bi-Yu Tang).
The Al3Zr phase could control the evolution of the grain and subgrain structure during subsequent processing operations, such as hot rolling and solution heat treatment [11].
Theoretically, the electronic structure especially the characteristics of bond between Zr and Al atoms in matrix, as well as the phase stability have also been studied [14,15].
In the multi-phase polycrystalline alloys, the thermal expansion coefficient plays an important role for structure and properties of alloy materials.
Online since: May 2011
Authors: Gui Yuan Li, Yang Xu, Zhong Yuan Duan
The Discussion on the Construction of City Waterfront Landscape Based on the Visual Angle of Ecology Restoration Guiyuan Li 1,a, Zhongyuan Duan 2,b and Yang Xu 2,b 1 College of Civil Engineering and Architecture of China Three Gorges University Wuhan Hubei China 2College of Civil Engineering and Architecture of China Three Gorges University Yichang Hubei China 2College of Chemistry and Life Science of China Three Gorges University Yichang Hubei China algy@ctgu.edu.cn , bduanzhong_yuan@126.com, b402794554@qq.com Key words: Waterfront Landscape; Ecology Restoration; Landscape Ecology Pattern; Artificial Wetland.
The concept of ecology restoration and theory.The ecology restoration means that, based on ecology principle, through certain technology and method of biology, ecology and engineering, artificially changes and cuts off the leading factor and process of ecosystem degradation, adjusts, configures or optimizes flow processes and space-time order of material, energy and information inside and outside the system, restoring the ecosystem structure, function and ecology potential certain or original even higher level [2].
Fig.1,Planning Structure of River Landscape Fig.2,Landscape Transformation of Ecological Wetland The bottom and side shores of Qiusuo Stream leak seriously because the stream rechannels.
The stream is cut off because of the campus extension, and this looses the soil structure of the stream bottom.
Online since: December 2012
Authors: Xue Yi Shi, Yun Ping Wang, Xiao Dan Sun
In addition, the situation was worsened by loose soil structure and soil degradation, so that agricultural yields in a normal year are only 3000kg / hm2.
On the cultivated land in these two test areas, according to different reclamation technology and years, we collected 10 soil samples for analysis of agricultural chemistry, including 5 samples of 0-20cm surface soil, 5 samples of 50cm bottom soil; excavating 15 sections and collecting 30 section samples.
Reclamation techniques Years of reclamation planting(a) Soil thickness (cm) Bulk density (g/cm3) Capillary water holding capacity (%) Total porosity (%) Aggregate structure (%) >2 mm 2~1 mm 1~0.5 mm 0.5~0.25 mm Stripping reclamation 5 0~20 1.36 30.77 48.68 51.69 19.39 15.68 7.06 >50 1.31 36.52 50.57 58.68 17.39 11.09 5.71 3 0~20 1.47 28.46 42.13 49.11 19.99 14.66 9.67 >50 1.43 28.87 39.00 55.69 19.56 10.93 7.28 1 0~20 1.53 27.30 43.77 47.82 18.99 13.66 8.97 >50 1.50 25.13 41.89 54.19 18.87 10.29 7.98 Mix push reclamation 1 0~20 1.17 37.04 55.85 47.45 22.25 15.68 5.90 >50 1.17 29.68 45.66 80.51 10.09 5.26 2.16 Non-Reclaimed sunk land 0~20 1.01 42.50 61.08 35.08 22.06 22.32 12.12 >50 1.08 38.57 59.25 35.08 22.80 22.00 12.53 Table 2 shows with the increase of reclamation age, surface soil of stripping reclamation bulk density decreased and soil total porosity and capillary water holding capacity increases year by year.
The soil structure is poor, so it is not conducive to the stability and development of crop root, water retention and fertilizer retention capacity is low.
Online since: February 2018
Authors: Bao Yu Gao, Xing Xu, Wen Song, Mo Xi Xue
Finally, the polymer-cationic polyamidine containing an amidine structure was obtained in solid, and the cationic polymer and represented amidine repeating unit in this structure [16].
The cationic polymer contained a repeating amidine structure, where the structure is: Characterization.
The time-weighted variance (abbreviated as TWV) indicates the interior structure of flocs.
As TEM image showed in Fig.1 (b), PA particles prepared were usually spherical and aggregated to a dendritic structure where the structure was attributed to large particle size and high purity.
Şahinkaya, COD and color removal from synthetic textile wastewater by ultrasound assisted electro-Fenton oxidation process, Journal of Industrial and Engineering Chemistry, 19 (2013) 601-605
Online since: August 2016
Authors: Carlos Alberto Alves Cairo, V.A.R. Henriques, Eduardo T. Galvani, A.C.S.M. Dutra, M.L.A. Graça
At this temperature it is possible to distinguish three different microstructures: Bright areas containing niobium core in dissolution; two-phase areas containing rich niobium or chromium structures; and homogeneous α2 (Ti3Al) areas in gray contrast with some lamellar structures in adjacent areas.
Basically, a fully lamellar structure is obtained with small inter-lamellar spacing.
It is possible to observe the first lamellar structures.
This structure is characterized by the presence of γ grains and lamellar colonies of alternating layers of γ and α2 phases.
Materials Chemistry and Physics, 81 (2003) 438–442
Online since: September 2025
Authors: Mochamad Zainuri, Darminto Darminto, Retno Asih, Dina Rika Silviana, Dylia Rahmadyanti, Haniffudin Nurdiansah
Different forms of graphene as the composite material of graphite can be wrapped in a zero-dimensional ball structure, rolled into a one-dimensional structure (CNT), or stacked into a three-dimensional layered structure [4].
In carbon, four valence electrons form a σ bond that produces the structure of the bee nest.
In coconut seeds, there is cellulose that has a hydroxyl or OH group in its molecular structure.
X-ray Diffraction (XRD), was used to identify the crystal structure of the samples.
Bielawski, “Harnessing the chemistry of graphene oxide,” Chem.
Online since: October 2006
Authors: Günter Motz
The educts, e.g. chlorosilanes and ammonia, are very cheap products of the chemistry industry.
Table 1: Various silazanes synthesised by ammonolysis of different chlorosilanes Educts Resulting silazane (simplified precursor structure) Precursor name Dichloromethylvinylsilane + Ammonia Si N CH3 CH=CH2 H n n > 2 VN Dichloromethylvinylsilane and Dichloromethylsilane (1 : 1) + Ammonia Si CH3 H N H n CH=CH2 Si CH3 N H n HPS Trichlorovinylsilane and Dichloromethylsilane (1 : 1) + Ammonia Si CH3 H N H n CH=CH2 Si NH N H n HVNG Bis-dichloromethylsilylethane + Ammonia N H CH2 Si N H Si CH2 CH3 CH3 N H NH Si Si CH2 CH2 CH3 CH3 N H N H n ABSE The processing properties as well as the pyrolysis behaviour of the precursors strongly depend on their molecular structure.
The polymer structure consists of very stable 5-membered rings and linear units.