scholarly journals Influence of Substituted Elements on Reflection Loss of Ba-Ferrite Nanoparticle

2017 ◽  
Vol 62 (2) ◽  
pp. 1201-1204
Author(s):  
S. Yang ◽  
K.-Pil. Jeong ◽  
S.-Y. Park ◽  
J.-Gon. Kim
Keyword(s):  
Reflection Loss ◽  
Barium Ferrite ◽  
Rapid Development ◽  
Sol Gel ◽  
Data Communication ◽  
Lattice Parameter ◽  
Information Communication ◽  
X Band ◽  
Communication Devices ◽  
Ti Substitution

Abstract Due to the rapid development of the information communication industries, it is expected that next-generation mobile communication devices in the data communication environment will be used at the same time in the L~X band (1–12 GHz). To mutual electric wave interference prevention, research on wave absorbers in L~X band is needed. In this paper, barium ferrite was researched as L~X band wave absorber. The Barium ferrite (BaM, Ba ferrite) substituted by divalent ions (Co2+, Cu2+, Ni2+, Zn2+) and tetravalent ion (Ti4+). The substituted Ba ferrite nanoparticles were fabricated by sol-gel process. Lattice parameter, particle size, magnetic properties, and reflection loss were analyzed by X-ray diffraction (X-RD), a Vibrating Sample Magnetometer (VSM), and a Network Analyzer. Lattice parameter of Ba ferrite was changed 0.0005 to 0.0078 Å in a-b direction, and 0.0187 to 0.0445 Å in c-direction by substituted elements, and it influenced on magnetic anisotropy. In addition, Co-Ti substitution elements influenced that coercive force decrease 5,739 to 2,240 Oe. Moreover, reflection loss frequencies were shifted from 16.3 GHz to 14.4 and 17.4 GHz by substituted elements Co-Ti and Zn-Ti.

Titanium Doped Barium Ferrite—A Case Study

2020 ◽  
Vol 12 (10) ◽  
pp. 1323-1327
Author(s):  
B. Nagarjun ◽  
N. S. S. V. Raja Rao ◽  
Ch. Rajesh ◽  
Y. V. P. K. Raghava ◽  
V. Brahmajirao
Keyword(s):  
Barium Ferrite ◽  
Sol Gel ◽  
Spectroscopic Studies ◽  
Lattice Parameter ◽  
Hexagonal Structure ◽  
Phase Identification ◽  
X Ray ◽  
Related Information ◽  
Morphological Studies ◽  
Ferrite Structure

In this paper synthesis of titanium doped barium ferrite (BaTixFe12–xO19) nanoparticles of hexagonal structure by employing sol-gel technique is reported. The composition was varied between x = 0.25 to 0.45. Structural analysis were carried out with the help of techniques such as X-ray diffraction (XRD) for phase identification, scanning electron microscopy (SEM) for morphological studies, to identify the elemental composition energy dispersive spectroscopy (EDX) was performed and Fourier transform infrared spectroscopy (FTIR) for bonding related information. From X-ray analysis it was observed that initially, with increase in Ti concentration there was a decrease in lattice parameters and cell volume. However, at Ti concentration of 0.38, an increase in lattice parameter was observed and has been attributed to electron hopping mechanism. Morphological analysis (SEM) done on the samples reveal that the nanoparticles are spherical in shape. EDX was utilized for elemental analysis of the products. FTIR spectroscopic studies reveal prominent peaks around 470 and 540 cm−1 is attributed to formation of ferrite structure and also indicative that the reaction is complete. The obtained results were discussed in the light of the available literature.

scholarly journals THE DESIGN OF TOPSIS4BIM DECISION SUPPORT FOR BUILDING INFORMATION MODELING SOFTWARE SELECTION

2015 ◽  
Vol 77 (5) ◽  
Author(s):  
Ahmad Taufik Nursal ◽  
Mohd Faizal Omar ◽  
Mohd Nasrun Mohd Nawi
Keyword(s):  
Building Information Modeling ◽  
Rapid Development ◽  
Information Modeling ◽  
Software Selection ◽  
Information Communication ◽  
Construction Companies ◽  
New Information ◽  
Building Information ◽  
Modeling Software ◽  
High Investment

The emerging of new Information Communication Technology (ICT) technology namely Building Information Modeling been proven benefits toward construction industry. As a result, the list of BIM software available in the market is keep increasing in recent years. This has led to the selection problem among construction companies. Moreover, the selection BIM software also required high investment in term of software, hard ware and training expenses. These aforementioned issues have increased the complexities of decision process and the need of decision aid in BIM software selection. Thus, this paper has introduced a new approach in MCDMDSS web development by utilization of Web 2.0 application. The rapid development of Information technology has highly benefit to the development of web based DSS. The design and validation architecture of a web base DSS called topsis4BIM for Building Information Modeling (BIM) is presented. 

Annealing Effects on the Physical and Magnetic Properties of Tb1.5Y1.5Fe5O12 Films Nanoparticles Prepared by Sol-Gel Method

2013 ◽  
Vol 756 ◽  
pp. 91-98 ◽  
Author(s):  
Ftema W. Aldbea ◽  
Noor Bahyah Ibrahim ◽  
Mustafa Hj. Abdullah
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Annealing Temperature ◽  
Quartz Substrate ◽  
Sol Gel ◽  
Lattice Parameter ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Iron Garnet

Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900 °C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900°C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-raySpectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealingtemperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. Normal 0 21 false false false MS X-NONE X-NONE MicrosoftInternetExplorer4 Terbium –substituted yttrium iron garnet (Tb1.5Y1.5Fe5O12) films nanoparticles were successfully prepared by a sol-gel method. The films were deposited on the quartz substrate using spin coating technique. To study effect of annealing temperature, the annealing process was executed at 700, 800 and 900°C in air for 2 hours. The X-ray diffraction (XRD) proved that the pure phase of garnet structure was detected for the film annealed at 900 °C. The lattice parameter increased with the increment of annealing temperature and the highest value of 12.35 Å was obtained at 900 °C. Field Emission Scanning Electron Microscope (FE-SEM) results showed that the particle size increased from 43nm to 56nm as annealing temperature increased from 700 to 900 °C. The film’s thickness also affected by increasing of annealing temperature and become thin at 900 °C due to densification process occurred at high annealing temperature. The elemental compositions of the Tb1.5Y1.5Fe5O12 film were detected using an Energy Dispersive X-ray Spectroscopy (EDX). Magnetic properties at room temperature were measured using a Vibrating Sample Magnetometer (VSM).The saturation magnetization Ms increased with the annealing temperature and showed a high value of 104emu/cm3, but the coercivity Hc of the film was decreased due to the increment of the particle size. st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;}

scholarly journals Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2095 ◽  
Author(s):  
Jinpei Lin ◽  
Jiaqi Zhang ◽  
Hao Sun ◽  
Qing Lin ◽  
Zeping Guo ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Sol Gel ◽  
Combustion Method ◽  
Lattice Parameter ◽  
Cubic Phase ◽  
Cobalt Chromium ◽  
X Ray Diffraction ◽  
Chromium Doping ◽  
Auto Combustion ◽  
Cr Concentration

Cobalt-chromium ferrite, CoCrxFe2−xO4 (x = 0–1.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O4.

Magnetization and Microwave Absorption Properties of La0.67 Sr0.33 MnO3 with Different Particle Size

2011 ◽  
Vol 374-377 ◽  
pp. 1541-1544 ◽  
Author(s):  
Yu Lan Cheng ◽  
Ping Xia ◽  
Ke Xiang Wei ◽  
Quan Bai
Keyword(s):  
Particle Size ◽  
Sinter Temperature ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Measured Frequency Range ◽  
Maximum Reflection Loss

La 0.67 Sr 0.33 MnO 3 particles with different particle size have been prepared by sol-gel method. The structure, magnetization and microwave absorption properties have been investigated. The results show that the particle size can be controlled by sinter temperature. The peaks of the maximum reflection loss (RL) move to higher frequency regions with increasing particle size. The value of the maximum RL is -32 dB at 10.2GHz with a particle size of 58.5nm. The bandwidth with a RL exceeding -8dB reached 1.6GHz in the whole measured frequency range, suggesting that La 0.67 Sr 0.33 MnO 3 particles are promising for application as a wideband and strong absorption building microwave absorber.

Magnetically anisotropic barium ferrite thin films on sapphire by sol–gel process

2010 ◽  
Vol 518 (12) ◽  
pp. 3342-3344 ◽  
Author(s):  
Hao Tang ◽  
Wenxu Zhang ◽  
Bin Peng ◽  
Wanli Zhang
Keyword(s):  
Thin Films ◽  
Barium Ferrite ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Ferrite Thin Films

E-Government for Rural Development in Tanzania

2019 ◽  
pp. 1678-1685
Author(s):  
R. W. Kisusu ◽  
D. M. Bahati ◽  
G. R. Kisusu
Keyword(s):  
Rural Development ◽  
Rural Areas ◽  
Service Providers ◽  
Good Governance ◽  
Rapid Development ◽  
Electronic Government ◽  
Information Communication ◽  
Technology Service ◽  
Rural Development Policy ◽  
Ineffective Policy

This chapter presents the importance of developing rural areas with an emphasis on good governance and poverty alleviation through the use of electronic government in Tanzania. With such concern, the authors show that rural areas are as significant as the economy of most of the developing countries, including Tanzania. As such, putting sufficient efforts on rural development is unavoidable for rapid development. Further, the authors note how Tanzania improves its rural areas through the use of e-government, but efforts are constrained by the existence of poor Information Communication Technology service providers, ineffective policy, and unreliability of rural electricity. In order to address such shortfalls, the authors propose several solutions that could motivate the increase in the use of rural e-government and revise rural development policy.

scholarly journals Research on Power Network Security Technology and Protection

2018 ◽  
Vol 246 ◽  
pp. 03016
Author(s):  
Aidong Xu ◽  
Kai Fan ◽  
Hang Yang
Keyword(s):  
Network Security ◽  
Power System ◽  
Rapid Development ◽  
Information Communication ◽  
Security Technology ◽  
Security Risks ◽  
Safety Control ◽  
Whole Process ◽  
Internal Network ◽  
Network Equipment

With the rapid development of information technology construction in the power industry, research on network security has become a problem that cannot be ignored. This paper introduces the use of information communication network equipment at home and abroad in power system; analyzes the security risks of foreign network equipment in power system, shows the risk of power system network and the urgent need for localization of network equipment and analyzes the security of internal network of power system Risks; specific measures for the safety control of network equipment in the whole process are proposed to provide reference for power system network security protection.

Current Network Security Systems

2005 ◽  
pp. 668-674
Author(s):  
Göran Pulkkis ◽  
Kaj Grahn ◽  
Peik Astrom
Keyword(s):  
Distributed Systems ◽  
Network Security ◽  
Communication Networks ◽  
Rapid Development ◽  
Data Communication ◽  
Security Systems ◽  
Network Servers ◽  
Security Software

Network security is defined as “a set of procedures, practices and technologies for protecting network servers, network users and their surrounding organizations” (Oppliger, 2000, Preface). The need for network security is caused by the introduction of distributed systems, networks, and facilities for data communication. Improved network security is required because of the rapid development of communication networks. Network security is achieved by using software based tools, that is, network security software (Pulkkis, Grahn & Åström, 2003).

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