Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: December 2013
Authors: Fei Gao, Yuan Hong Song, Fu Hai Zhong, Xuan Yin, Jin Bo Wu, Li Ying Tang
As a cat well in Mahudang of Burma on anticline structure zone, YH-1 encountered narrow formation pressure window stratum in the process of drilling with the problem that loss of filtration is serious and the speed of air cutting rises rapidly.
Introduction Gas cut is inclined to become more serious in drilling liner cementing of narrow pressure window gas well which is of complicated geologic structure, active oil and gas and low stratum loading capacity.
Conclusion 1) Drilling liner cementing techniques which is composed of extension hanger and expansive cement slurry system utilized in Burma make full advantage of tools, machines, and methods of chemistry to better solve such technical difficulties as drilling liner cementing in narrow layer pressure window.
Introduction Gas cut is inclined to become more serious in drilling liner cementing of narrow pressure window gas well which is of complicated geologic structure, active oil and gas and low stratum loading capacity.
Conclusion 1) Drilling liner cementing techniques which is composed of extension hanger and expansive cement slurry system utilized in Burma make full advantage of tools, machines, and methods of chemistry to better solve such technical difficulties as drilling liner cementing in narrow layer pressure window.
Online since: January 2012
Authors: Li Ma, Zhi Yuan Tang, Hui Xia Ren, Ji Yan
Fast Microwave Synthesis Lithium Vanadium Phosphate Using Peg as a Novel Carbon Source
Ji Yan1,1, Zhiyuan Tang1, Huixia Ren2, Li Ma2
1 Department of Applied Chemistry, School of Chemical and Engineering, Tianjin University, Tianjin 300072, P.R.
XRD result shows that the material was well crystallized and the structure was indexed as a monoclinic Li3V2(PO4)3/C.
In comparison with another phosphate composite LiFePO4, monoclinic structure Li3V2(PO4)3 demonstrates good ion mobility and high potential voltage, which can be obtained by extraction three freedom Li+ ions from different Li sites at various potential ranges.
XRD result shows that the material was well crystallized and the structure was indexed as a monoclinic Li3V2(PO4)3/C.
In comparison with another phosphate composite LiFePO4, monoclinic structure Li3V2(PO4)3 demonstrates good ion mobility and high potential voltage, which can be obtained by extraction three freedom Li+ ions from different Li sites at various potential ranges.
Online since: August 2017
Authors: Bao Min Wang, Rui Shuang Jiang
However, the larger scale additives are difficult to impact on the structure of cement-based materials at micro-level.
Graphite oxide was obtained from Institute of Coal Chemistry, Chinese Academy of Science.
The plane structure of GP was apparently found in cement matrix in Fig. 4b.
The hydration products displayed a few flower-like structures, in accordance with previous literatures [15].
The unique structure of hydration products could improve the density of cement-based materials.
Graphite oxide was obtained from Institute of Coal Chemistry, Chinese Academy of Science.
The plane structure of GP was apparently found in cement matrix in Fig. 4b.
The hydration products displayed a few flower-like structures, in accordance with previous literatures [15].
The unique structure of hydration products could improve the density of cement-based materials.
Online since: April 2014
Authors: Ioannis Kartswnakis, E. Statharas, P. Tserotas
Introduction
For the designing of materials for engineering applications, is significant the knowledge the relation of structure with the properties [1-6], being vital in magnetic development [7-12].
The structure of magnetic nanoparticles was characterized by Philips Analytical X-ray diffractometer using CuKα radiation (λ=1.54056 Å) between 170 < 2θ < 700, fourier transform infrared spectroscopy (FT-IR, Perkin Elmer-1600 Series).
Being unable to draw a conclusion for the crystal structure of the obtained nanoparticles from that pattern, a second XRD pattern was used for comparison.
As it can be seen, in this pattern, some characteristic peaks exhibited (220, 311, 400, 422, 511, 440 at around 2θ≈ 300, 350, 430, 530, 570, 630 respectively) , that are well matched with those of a face-centered cubic spinel structure with diffraction peaks of iron oxide, according to the JCPDS cards no. 019-0629 and 039-1346.This confirms the spinel structure of synthesized nanoparticles, which were identified to correspond in Fe3O4 and/or γ-Fe2O3.
Hristoforou, Cyclodextrin inclusion complexes as novel MOCVD precursors for potential cobalt oxide deposition, Applied Organometallic Chemistry, 24, p. 112-121, 2010
The structure of magnetic nanoparticles was characterized by Philips Analytical X-ray diffractometer using CuKα radiation (λ=1.54056 Å) between 170 < 2θ < 700, fourier transform infrared spectroscopy (FT-IR, Perkin Elmer-1600 Series).
Being unable to draw a conclusion for the crystal structure of the obtained nanoparticles from that pattern, a second XRD pattern was used for comparison.
As it can be seen, in this pattern, some characteristic peaks exhibited (220, 311, 400, 422, 511, 440 at around 2θ≈ 300, 350, 430, 530, 570, 630 respectively) , that are well matched with those of a face-centered cubic spinel structure with diffraction peaks of iron oxide, according to the JCPDS cards no. 019-0629 and 039-1346.This confirms the spinel structure of synthesized nanoparticles, which were identified to correspond in Fe3O4 and/or γ-Fe2O3.
Hristoforou, Cyclodextrin inclusion complexes as novel MOCVD precursors for potential cobalt oxide deposition, Applied Organometallic Chemistry, 24, p. 112-121, 2010
Online since: April 2018
Authors: Olimpia Ghermec, Christian Ghermec, Elena Gavrilescu
The curriculum is structured on the principles of multidisciplinarity (in the first two years) and interdisciplinarity (in the last two years of study)[1].
In accordance with the structure of the programs of a number of prestigious European and Romanian universities, the last semester of studies id dedicated to research.
The curriculum is structured so that it ensures the insertion of the graduates in the labor market by means of its harmonization with national and foreign programs.
Each step can be structured in technical, technological and economical aspects, GHG emissions, hazardous substances (RoSH), legal requirements etc.
Master programs, as a resource for research, must be structured so that they educate students in the spirit of transdisciplinarity.
In accordance with the structure of the programs of a number of prestigious European and Romanian universities, the last semester of studies id dedicated to research.
The curriculum is structured so that it ensures the insertion of the graduates in the labor market by means of its harmonization with national and foreign programs.
Each step can be structured in technical, technological and economical aspects, GHG emissions, hazardous substances (RoSH), legal requirements etc.
Master programs, as a resource for research, must be structured so that they educate students in the spirit of transdisciplinarity.
Online since: May 2013
Authors: Pei Qun Su, Zhi Hui Deng
When the load F and hydraulic cylinder structure parameters A1 and A2 determined, opening pressure depends on the hydraulic control one-way valve structure parameter N.
Thus, a hydraulic control one-way valve structure parameters to the opening pressure have a greater impact.
When the load F and structure parameter N of the hydraulic control one-way valve determined, Opening pressure depends on the structural parameters of hydraulic cylinder.
Chemistry industry press. 2008.03
[2] Song Hailin, Structure features and application of hydraulic control one-way valve, J.
Thus, a hydraulic control one-way valve structure parameters to the opening pressure have a greater impact.
When the load F and structure parameter N of the hydraulic control one-way valve determined, Opening pressure depends on the structural parameters of hydraulic cylinder.
Chemistry industry press. 2008.03
[2] Song Hailin, Structure features and application of hydraulic control one-way valve, J.
Online since: July 2011
Authors: Yan Chen, Yu Can Fu, Hong Hua Su, Z.C. Guo
The interfacial structure between diamond and Cu-Sn-Ti brazing alloy has been studied in many literatures[9-12].
The experimental equipments and the structure of brazed diamond core drill are shown in Fig.1(a) and (b).
(a) The experimental equipments (b) Structure of brazed diamond core drill Fig.1 The experimental equipments and the structure of brazed diamond core drill Results and Discussion Microstructure.
The microstructure, interfacial layered structure and morphology of TiC formed between diamond and alloy matrix was examined.
Lin: Materials Chemistry and Physics Vol. 84 (2004), p.251.
The experimental equipments and the structure of brazed diamond core drill are shown in Fig.1(a) and (b).
(a) The experimental equipments (b) Structure of brazed diamond core drill Fig.1 The experimental equipments and the structure of brazed diamond core drill Results and Discussion Microstructure.
The microstructure, interfacial layered structure and morphology of TiC formed between diamond and alloy matrix was examined.
Lin: Materials Chemistry and Physics Vol. 84 (2004), p.251.
Online since: January 2011
Authors: Liang Ji Chen, Jun Wei Cheng, Xian Zhang Feng
The structure of system is shown in Figure 2.
The structure of flip-chip package is shown in Figure 4.
Stack type: It can form interconnect into the 3D structure with two or more bare chip or packaged chip in the direction perpendicular of the chip.
Eaton et al, MEMS Reliability: Infrastructure, Test Structures, Experiments and Failure Modes, Sandia 2000-0091, Unlimited Release, Jan. 2000
Study of the Thermo mechanical Coupling Effect in COB Packaging Structures.
The structure of flip-chip package is shown in Figure 4.
Stack type: It can form interconnect into the 3D structure with two or more bare chip or packaged chip in the direction perpendicular of the chip.
Eaton et al, MEMS Reliability: Infrastructure, Test Structures, Experiments and Failure Modes, Sandia 2000-0091, Unlimited Release, Jan. 2000
Study of the Thermo mechanical Coupling Effect in COB Packaging Structures.
Online since: December 2012
Authors: Hong Yi Dai, Li Ping Zhang, Guo Lin Shao, Chun Ling Yu, Ying Huan Fu
The investigation of preparing the beta zeolite membrane by the way of secondary growth
Guolin Shao1,a, Chunling Yu1,b, Yinghuan Fu1,c,Hongyi Dai1,d
and Liping Zhang2,e,*
1School of Light Industry & Chemistry Engineering, Dalian Polytechnic University,Dalian ,Liaoning,116034, P.R.
But owing to the complicated structure the researches on beta zeolite membrane have been few.
It is an intergrowth of two (or three) polymorphs, one of them being the only known real zeolite structure showing chirality [3,4].
It has potential application for separations and catalytic membrane reactors due to its unique pore structure and catalytic properties.
Because of the structure of three dimensional interconnected channel with large pore, the growth of beta zeolite on the supports is more difficulty than the zeolite with two or one dimensional channel structure.
But owing to the complicated structure the researches on beta zeolite membrane have been few.
It is an intergrowth of two (or three) polymorphs, one of them being the only known real zeolite structure showing chirality [3,4].
It has potential application for separations and catalytic membrane reactors due to its unique pore structure and catalytic properties.
Because of the structure of three dimensional interconnected channel with large pore, the growth of beta zeolite on the supports is more difficulty than the zeolite with two or one dimensional channel structure.
Online since: December 2012
Authors: Li Chen, Zhao Ping Fang, Shao Dong Zhang, Zheng Qiu Xia
It is equipped with a clamping device is another structure characteristic of the automatic slicing instrument.
The structure of the cutter clamping device is shown in Fig. 2.
Its structure is shown in Fig. 3.
The structure is shown in Fig. 4.
Fibre Chemistry, Vol. 40 (2008), p. 50 [5] Liu Yan-yan, Gao Chun-peng, Gao Ming and Dong Ying: Improvement of the slicing technology of fiber cross section.
The structure of the cutter clamping device is shown in Fig. 2.
Its structure is shown in Fig. 3.
The structure is shown in Fig. 4.
Fibre Chemistry, Vol. 40 (2008), p. 50 [5] Liu Yan-yan, Gao Chun-peng, Gao Ming and Dong Ying: Improvement of the slicing technology of fiber cross section.