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A New Concept in Modern Industry Sector, “Virtual Industry Model”
No full textThis thesis is submitted to the Department of Industrial Engineering and Management, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Engineering in Industrial Engineering and Management, December 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 84-86).Virtual office has become a popular and desired office management system for technologybased
low-cost office management system. This virtual management system is a new way of
working that enables the virtual worker to work outside the walls of the traditional office. In
this system, all the administrative functions of an organization are not necessarily
geographically centered in one office. The process of designing and implement a low cost and
effective "Virtual office management system" has been introduced in this work. The total
system works using software which is named “Virtual Industry Model.” The software contains
a secure database system and another computing method as required for industry. It is also
interesting that using software and the total process will be automated and computerized what
is a big deal in the industrial process. Finally, the system was applied to manufacturing,
production and service operations. The results show that from the viewpoint of decision
making, product design, production planning, production control to marketing, they were able
to save their, time, their money and found the operation management easier.Md. BadiuzzamanMaster of Science in Engineering in Industrial Engineering and Managemen
Study of the Structural, Electrical and Magnetic Properties of Rare Earth Yttrium Doped Mn-Zn Ferrites
No full textThis thesis is submitted to the Department of Physics, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Philosophy, June 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 70-76).Mn-Zn ferrites belong to a group of spinels studied extensively because of
their interesting technical properties. The present work focused on rare earth (Y)
substituted for Fe in Mn-Zn ferrites are well-known technological magnetic materials
used for manufacturing of multilayer chip inductor and applications in various
electrical devices. The series of ferrite sample of composition Mn0.5Zn0.5YxFe2-xO4
where x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.10 were prepared by solid state reaction
technique sintered at 1200C with 2 hours holding time. The X-ray diffraction
analysis revealed that rare earth free sample shows formulation of single phase cubic
spinel structure with no extra peak but Y substituted for Fe in Mn-Zn samples show
additional peaks manifested the formation of secondary phase presumably YFeO3.
Lattice constant primarily increase up to x = 0.04 and thereafter decreases. X-ray
density of this composition is slightly greater than that of their bulk densities due to
existence of some pores in the bulk sample. The average grain size decrease
monotonically with increasing Y content while the porosity of studied samples follow
the opposite trend. The average grain size has significant influenced on the magnetic
properties such as permeability. A significant change in initial permeability has been
found to increase or decrease by the amount of Y3+ in Mn0.5Zn0.5YxFe2-xO4 ferrite.
But the initial permeability decreases with increasing Y ions in ferrite except x = 0.06.
Relative Quality factor (RQF) signifies the merit of the material from the application
point of view and found to have high values for the samples with x= 0.04 and x=
0.08.The saturation magnetization (MS), coercivity (Hc) and remanent induction (Mr)
have been calculated from M – H curve at room temperature. The decrease of MS with
increasing of Y substitutions has been explained as the effect of dilution of Fe3+
magnetic moment by nonmagnetic Y3+. The electrical DC resistivity decreases with
increasing temperature for all studied samples manifesting semiconducting nature of
Y substituted Mn-Zn ferrites. The dielectric constant is found to decrease
continuously with increasing frequency and remain almost constant at higher
frequency range. Dielectric polarization and conduction process arise due to the local
displacements of electrons which in turn gives the dielectric constants.Subroto Subon AcharjeeMaster of Philosoph