Search results

Magnesium is the lightest metal structure material, whose density is about 1.74g/cm3.
Because of the melting point, specific heat and phase change latent heat of magnesium alloy is low, so it has well casting properties such as the rapid curing rate, low dynamic viscosity, good casting filling, short casting production cycle, easy to forming of thin-wall structure parts, and so on.
In 2001, Toyota introduced four passengers mini concept car ES3 which the rear network structure of the front seats was made from magnesium alloy.
In 2006 Changchun Institute of Applied Chemistry is the first in our country to research heat-resistant, creep-resistant magnesium alloy automotive cylinder head which used in the 460-horsepower engine of heavy truck, production capacity is 40,000 units per year, this changed the history of China's heavy truck auto parts without magnesium.
In 2007, China's Ministry of Science and Technology and U.S., Canada launched the project of magnesium vehicle body front structure research and development, the entire project had been completed in 2012 to solve the auto parts products, smelting, casting problem.

Shaheen3,c 1 National Center for Physics, QAU, Islamabad, Pakistan 2 Department of Chemistry Florida State University, Tallahassee, USA 3 Department of Physics, Florida State University, Tallahassee, USA a s_n_ahmad@yahoo.com, bstrouse@chem.fsu.edu, cshaheen@martech.fsu.edu Keywords: Self-assembled monolayers, Soft lithography, superparamagnetism.
With the developments in nanofabrication technology and downsizing in the existing structures of devices, the ability to organize a structure in multiple-dimensions becomes ever more critical.
Finally a 6 nm thick layer of permalloy was sputtered on freshly prepared patterned and unpatterned structures of SAMs in a 3.5 mT argon atmosphere in the chamber of AJA sputtering system with base pressure of 3.5 x 10-7 Torr.
The schematic representation of sputtering of Py on a patterned structure of polar and nonpolar molecules is shown in Fig. 1.

New Family of Ruthenium-Dye-Sensitized Solar Cells (DSSCs) with a High Solar-Energy-Conversion Efficiency Yuranan thathong, Kraisak Traipop, Taweesak Sudyoadsuk and Rukkiat Jitchati* Center for Organic Electronic and Alternative Energy (COEA), Department of Chemistry, Faculty of Science, Ubon Ratchathani University, Warinchumrap,Ubon Ratchathani Province, 34190, Thailand rukkiat_j@hotmail.com* Keywords: Dye-syntizingsolar cell (DSSCs); ruthenium complex; bipyridine; dipyrido phenazine Abstract.
The molecular structures of N3 and N719 dyes Herein, we report the synthesis of two ruthenium complexes with dipyrido[3,2-a:2¢,3¢-c]phenazine and bipyridine ligand which both complexes were characterized and studied for DSSC application.
The molecular structure of ruthenium phenazine 5 and 6 Fig. 3. a) 1.6 x 10-4 M solution absorption spectra b) 1 × 10−3 M cyclic voltammograms of 5, 6 and N3 (in DMF) Both complexes were studied the UV-Vis absorption spectra in DMF solution as the spectra shown in Fig. 3.
Both ruthenium 5 and 6 complex structures were characterized by 1H NMR and IR spectra.
Palomares, Dye structure-charge transfer process relationship in efficient ruthenium-dye based dye sensitized solar cells, Energy Environ.

The microstrip antenna has Characteristics such as light weight, small size, low cost, plane structure, can and integrated circuit compatible etc.
For microstrip antenna speaking, currently the specific methods of miniaturization mainly are: using high dielectric constant substrate, using short circuit loading technique, meandering and adopting new technology of materials and the structure of the special form etc[7].
Usually the rectangular microstrip antennas of the half wave structure, the current in the antenna from one open circuit to another open circuit can form standing wave.
Taking the patch antennas above for the example, the current distribution is shown as Fig. 5: Fig. 5 Traditional patch antennas are current distribution If the patch is in short circuited to the floor in the zero potential line, the standing wave structure can be formed from the open circuit to the short circuit.
(In Chinese) [3] VAN BRUNT R J: Physics and Chemistry of Partial Discharge and Corona, IEEE Trans. on Dielectrics and Electrical Insulation, Vol. 1(1994) No.5, p.761- 784

Effect of Sulfuric Acid Treatment and Calcination on Commercial Zirconia Nanopowder Maisari Utami, Karna Wijaya* and Wega Trisunaryanti Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Indonesia *e-mail: karnawijaya@ugm.ac.id Keywords: Sulfated zirconia, Sulfuric acid, Calcination Abstract.
The addition of sulfate will increase thermal stabilization, lower reaction temperatures and stabilize the structure of zirconia [2].
This present study is focused on the synthesis of sulfated zirconia prepared using commercial zirconia nanopowder as a precursor and study the effect of sulfuric acid concentration and calcination temperature on the crystalline structure and acidic properties of sulfated zirconia.
The crystalline structures were characterized by an X-ray diffraction (XRD, Rigaku Multiflex, λ = 1.54 Å, 60 kV, 30 A) with source of CuKα radiation (Ni filtered), patterns were recorded from 4-70° (2θ).
The surface morphology of both samples exhibit disordered structure.

Design a Temperature Control System Based on Labview Huanxin Cheng1, a, Kai Zhang1,b , Li Cheng2,c 1 Qingdao University of Science and Technology, Qingdao of Shan dong province, china 2Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi, Xingjiang, china achenghuanxin@126.com, bkkqust@163.com, cbillcl@live.com Keywords: Labview; singlechip; data collection; temperature control Abstract.
The combined with Labview software of Simple structure and high usability has become a set of complete with data acquisition and data processing electronic instruments.
It has formed a complete set of control method and the typical structure.
PID controller has a simple structure, the characteristics of good stability, reliable operation, easy to adjust.
System structure and parameters of the controller must depend on experience and on-site commissioning to determine.

Porous Systems Based on Alkali-Activated Fly Ash Pavel Kejík1,a, Vlastimil Bílek Jr.2,b*, Pavel Bulejko1,c, Jan Hajzler2,d, Matěj Březina2,e, Lucie Galvánková2,f and Lukáš Kalina2,g 1Brno University of Technology, Faculty of Mechanical Engineering, Heat Transfer and Fluid Flow Laboratory, Technická 2896/2, 616 69 Brno, Czech Republic 2Brno University of Technology, Faculty of Chemistry, Materials Research Centre, Purkyňova 118, 612 00 Brno, Czech Republic aPavel.Kejik@vut.cz, bbilek@fch.vut.cz, cPavel.Bulejko@vut.cz, dxchajzlerj@fch.vut.cz, excbrezinam@fch.vut.cz, fxcgalvankova@fch.vut.cz, gkalina@fch.vut.cz *corresponding author Keywords: Alkaline activation, fly ash, porosity, mercury intrusion porosimetry, scanning electron microscopy, filtration membranes.
In ceramic membrane preparation, a lot of techniques have been used to tailor porous structure such as sol-gel synthesis, freeze-casting or cementation [7] which can be influenced by sintering temperature.
This work, however, aimed to prepare membrane from fly ash via alkaline activation without sintering with pore structure influenced by changing the activating solution dose.
Pore structure was evaluated by software using Washburn equation.
Fig. 3: Microstructure of the prepared specimens (FA6 on the left and FA-12 on the right) observed by SEM in SE mode, magnitude 200× Fig. 4: Comparison of the binder phase between FA particles (FA6 on the left and FA-12 on the right) as observed by SEM in BSE mode, magnitude 2000× Pore structure of the prepared porous AAFA systems was also investigated using MIP and CFP.

So studying the structure and function of protein is an important project in biochemistry, chemistry and medical.
Many enzymes need zinc ion as cofactor for their catalytic activity [7], zinc stabilizes the structure of proteins and nucleic acids, preserves the integrity of subcellular organelles [8], and being vital in many cellular processes including gene expression, enzyme regulation and neurotransmission [9].
The preparation of Zn(II) complex see the literature [12], the molecular structure is shown in Fig.1. m.p: 199-201˚C.
Fig.1 Molecular structure of the Zn(II) complex Fig.2 Emission spectra of BSA in the presence and absence of Zn(II) complex [BSA]: 5.0 μmol·L−1; [Zn(II) complex]: 0, 6, 9, 12, 15, 18, 20, 25μmol·L−1.

The composition and the structure of the as-prepared products were confirmed by the X-ray diffraction (XRD) pattern, using a Philip X’ Pert PRO SUPER rA rotation anode with Ni-filtered Cu Kα radiation (λ = 1.54187 Å).
The diffraction rings/spots can be again indexed as 111, 200, 220, and 311 reflections, consistent with the cubic structure of polycrystalline W2N, which further supports the XRD result.
The FE-SEM image (Fig. 3b) gives more detailed information of the surface of as-obtained b-W2N, which reveals the high yield of the lamellar structure.
From it the reflection rings/spots of planes 100, 101, 110 and 111 are clearly seen, consistent with the hexagonal structure of polycrystalline δ-WN and the result of XRD study.
Oyama: The Chemistry of Transition Metal Carbides and Nitrides (Blackie Academic Professional, Glasgow 1996)

TEM Characterization of Near Sub-Grain Boundary Dislocations in Directionally Solidified Multicrystalline Silicon Maulid Kivambe1 a, Gaute Stokkan1 b, Torunn Ervik1 c, Birgit Ryningen2 d , Otto Lohne1 e 1 Department of Materials Science and Engineering, NTNU, 7491, Trondheim, Norway 2 SINTEF Materials and Chemistry, NO-7465, Trondheim, Norway a maulid.kivambe@material.ntnu.no, b gaute.stokkan@material.ntnu.no, c torunn.ervik@material.ntnu.no, dbirgit.ryningen@sintef.no, eotto.lohne@material.ntnu.no Keywords: dislocations, sub grain boundaries, mc-si, TEM.
The recombination activity of grain boundaries has been shown to depend on their impurity gettering ability, the property which depends on the grain boundary structure [2].
Selected defect structures were systematically studied along the block height with light microscopy (LM).
Yoo et al [12], have reported similar observation in High Angle grain boundaries, and show that kinks developed by re-shaping of grain boundary structure generate dislocations when the material is subjected to thermal stresses at sufficiently elevated temperatures.
Dislocation propagation to the grain volume from one or more sources within the boundary may be disrupted by dislocations from other sources, by other defects such as stacking faults or by dislocation walls of poligonized structures near the boundary, depending on the orientation of the boundary plane, its dislocation sources and the planes in which lattice dislocations propagate.