Mary, Alexander; Dr. Eby Thomas, Thachil(Cochin University of Science & Technology, April , 2008)
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Abstract:
This research project explores the utilization of cardanol in various capacities for
rubber processing. Cardanol is a phenol with a long side chain in the meta position
of the benzene ring. It is obtained by the vacuum distillation of cashew Hut shell
liquid (CNSL) which is a cheap agro-byproduct. In this study, the plasticizer property
of cardanol was investigated in silica filled and HAF black filled NR, NBR, EPDM
and CR by comparing cure characteristics and mechanical properties of vulcanizates
containing conventional plasticizer with those containing cardanol as plasticizer. The
co-activator, antioxidant and accelerator properties were investigated in gum samples
of NR, NBR, EPDM and CR by comparing the properties of vulcanizates which
contain conventional co-activator, antioxidant and accelerator with those in which
each of them was replaced by cardanol. The general effectiveness of cardanol was
investigated by determination of cure time , measurement of physical and
mechanical properties, ageing studies, crosslink density, extractability, FTIR spectra,
TGA etc.The results show that cardanol can be a substitute for aromatic oil in both silica filled
and HAF black filled NR. Again, it can replace dioctyl phthalate in both silica filled
and HAF black filled NBR. Similarly, cardanol Can replace naphthenic oil in silica
filled as well as HAF black filled EPDM and CR. The cure characteristics and
mechanical properties are comparable in all the eight cases. The co-activator
property of cardanol is comparable to stearic acid in all the four rubbers. The cure
characteristics and mechanical properties in this case are also comparable. The
antioxidant ,property of cardanol is comparable to TQ in all the four rubbers. The
antioxidant property of cardanol is comparable to TQ in all the four case of NBR and
EPDM.The
accelerator property of cardarlol is comparable with CBS in the case of NBR and
EPDM. No accelerator property is observed in the case of NR. The accelerator
property of cardanol in CR is not negligible when compared with TMTD.
Description:
Department of Polymer Science and Rubber Technology,
Cochin University of Science and Technology
Anupam,Chandran R; Dr.Aanandan, C K(Cochin University of Science and Technology, June , 2007)
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Abstract:
This thesis presents the Radar Cross Section measurements of different geometric structures such as flat plate,cylinder, corner reflector and circular cone loaded with fractal based metallo dielectric structures.Use of different fractal geometris,metallizations of different shapes as well as the frequency tanability is investigated for TE and TM polarization of the incident electromagnetic field.Application of fractal based metallo-dielectric structures results in RCS reduction over a wide range of frequency bands.RCS enhancement of dihedral corner is observed at certain acute and obtuse corner angles.The experimental results are validated using electromagnetic simulation softwares.
Description:
Department of Electronics,
Cochin University of Science and Technology
Sumam, Mary Idicula; Joseph, Alexander; Sudheep, Elayidom(Academy Publisher, May , 2009)
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Abstract:
For years, choosing the right career by
monitoring the trends and scope for different career paths
have been a requirement for all youngsters all over the
world. In this paper we provide a scientific, data mining
based method for job absorption rate prediction and
predicting the waiting time needed for 100% placement, for
different engineering courses in India. This will help the
students in India in a great deal in deciding the right
discipline for them for a bright future. Information about
passed out students are obtained from the NTMIS (
National technical manpower information system ) NODAL
center in Kochi, India residing in Cochin University of
science and technology
Description:
International Journal of Recent Trends in Engineering, Vol. 1, No. 1, May 2009
Paul, A J; Mythili, P; Poulose Jacob,K(Cochin University of Science and Technology, February 10, 2012)
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Abstract:
n the recent years protection of information in digital form is becoming more important. Image and video encryption has applications in various fields including Internet communications, multimedia systems, medical imaging, Tele-medicine and military communications. During storage as well as in transmission, the multimedia information is being exposed to unauthorized entities unless otherwise adequate security measures are built around the information system. There are many kinds of security
threats during the transmission of vital classified information through insecure communication channels. Various encryption schemes are available today to deal with information security issues. Data encryption is widely used to protect sensitive data against the security threat in the form of “attack on confidentiality”. Secure transmission of information through insecure communication channels also requires encryption at the sending side and decryption at the receiving side. Encryption of large text message and image takes time before they can be transmitted, causing considerable delay in
successive transmission of information in real-time. In order to minimize the latency, efficient encryption algorithms are needed. An encryption procedure with adequate security and high throughput is sought in multimedia encryption applications. Traditional symmetric key block ciphers
like Data Encryption Standard (DES), Advanced Encryption Standard (AES) and Escrowed Encryption Standard (EES) are not efficient when the data size is large. With the availability of fast computing tools and communication networks at relatively lower costs today, these encryption standards appear to be not as fast as one would like. High throughput encryption and decryption
are becoming increasingly important in the area of high-speed networking. Fast encryption algorithms are needed in these days for high-speed secure communication of multimedia data. It has been shown that public key algorithms are not a substitute for symmetric-key algorithms. Public key algorithms are slow, whereas symmetric key algorithms generally run much faster. Also, public key systems are vulnerable to chosen plaintext attack.
In this research work, a fast symmetric key encryption scheme, entitled “Matrix Array Symmetric Key (MASK) encryption” based on matrix and array manipulations has been conceived and developed. Fast conversion has been achieved with the use of matrix table look-up substitution, array based transposition and circular shift operations that are performed in the algorithm. MASK encryption is a new concept in symmetric key cryptography. It employs matrix and array manipulation technique using
secret information and data values. It is a block cipher operated on plain text message (or image) blocks of 128 bits using a secret key of size 128 bits producing cipher text message (or cipher image) blocks of the same size. This cipher has two advantages over traditional ciphers. First, the encryption
and decryption procedures are much simpler, and consequently, much faster. Second, the key avalanche effect produced in the ciphertext output is better than that of AES.
Description:
Division of Electronics Engineering, School of Engineering, Cochin University of Science and Technology
Prajith, K K; Dr.Madhusoodana,Kurup B(Cochin University of Science and Technology, December , 2011)
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Abstract:
This thesis Entitled Application of Biofloc technology (BFT) In the Nursery Rearing and Farming of
Giant Freshwater Prawn,Macrobrachium Rosenbergii(De Man). Aquaculture, rearing plants and animals under controlled conditions is growing with an annual growth rate of 8.3% in the period 1970-2008 (FAO, 2010). This trend of growth is essential for the supply of protein-rich food for ever increasing world population. But growth and development of aquaculture should be in sustainable manner, preferably without jeopardizing the aquatic environment.In the present study, the application of BFT in the nursery rearing and farming ofgiant freshwater prawn, M. rosenbergii, is attempted. The result of the study is organised into eight chapters. In the first chapter, the subject is adequately introduced. Various types of aquaculture practices followed, development and status of Indian aquaculture, present status of freshwater pravm culture, BF T and its use for the sustainable aquaculture systems, theory of BFT based aquaculture practices, hypothesis, objective and outline of the thesis are described. An extensive review of literature on studies carried out so far on biofloc based aquaculture are given in chapter 2. The third chapter deals with the application of BFT in the primary nursery phase of freshwater prawn. Several workers suggested the need for an intermediate nursery phase in the culture system of freshwater prawn for the successful production. Thirty day experiment was conducted to study the effect of BFT on the water quality, and animal welfare under the various stocking densities.
The study concluded that stocking finfishes in biofloc-based monoculture system of freshwater prawns has the potential of increasing total yield. Prawns having a higher commercial value than finfishes besides ensuring economic sustainability. Results showed that prawn yield and survival was better in catla dominated tanks. Based on the results of the study, it is recommended to incorporate 25% rohu and 75% catla in the biofloc-based culture system of giant freshwater prawns. The results of the
present study also recommend to stock relatively larger catla for biofloc-based culture system. Fish production was also higher in the 100% catla tank. When catla was added in higher percentages it should ensured that the hiding objects in the culture ponds shall be used in order to reduce the chance of cannibalism among prawns. rohu and catla equally have the ability to harvest the biofloc, catla consumes the planktonic contributes in the floc whereas rohu grazed on the bacterial consortium suspended in the water column. In Chapter 8, recommendations and future research perspectives in
the field of biofloc based aquaculture is presented.
Description:
School of Industrial Fisheries, Cochin University of Science and Technology
Nair, K G; Vasudevan, K; Mohanan, P; Aanandan, C.K(CUSAT, December 17, 2014)
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Description:
14th Biennial International Symposium on Antennas and propagation Department of Electronics, Cochin University of Science & Technology, Cochin 682022, INDIA
Newby, Joseph; Dr.Saramma, A V(Cochin University of Science and Technology, December 28, 2002)
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Abstract:
Aquatic ecosystem in the south west coast of India is noted for its diversity of
habitats. Very often these environments turn bluegreen when the bloom of
bluegreen algae (cyanobacteria) appear consequent to eutrophication. This
phenomenon occursin these habitats one after the other or simultaneously. This
conspicuousness make one curious enough to know more about these nature’s gift
bestowed upon mankind. While persuing the literature on the magnificent flora) it
is understood that it may provide food fertilizer, chemicals and bioactive
substances. These bioactive substances are likely to be involved in regulating
natural populations and are potentially useful as biochemical tools and as
herbicidal or biocontrol agents. The role of cyanobacteria in the aquatic food
chain and contribution in abatement of heavy metals from the natural
environment are well documented. Considering the manifold utilization of the flora and their significance in the food chain, the present investigation has been undertaken
Description:
Department of Marine
Biology, Microbiology and Biochemistry, School of Marine Sciences, Cochin University of Science and Technology
Baiju, K V; Dr. K G K Warrier(National Institute for Interdisciplinary Science and Technology,CSIR, November , 2007)
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Abstract:
The present thesis develops from the point of view of titania sol-gel chemistry and an attempt is made to address the modification of the process for better photoactive titania
by selective doping and also demonstration of utilization of the process for the
preparation of supported membranes and self cleaning films.A general introduction to nanomaterials, nanocrystalline titania and sol-gel
chemistry are presented in the first chapter. A brief and updated literature review on
sol-gel titania, with special emphasis on catalytic and photocatalytic properties and
anatase to rutile transformation are covered. Based on critical assessment of the reported
information the present research problem has been defined.The second chapter describes a new aqueous sol-gel method for the preparation
of nanocrystalline titania using titanyl sulphate as precursor. This approach is novel
since no earlier work has been reported in the same lines proposed here. The sol-gel
process has been followed at each step using particle size, zeta potential measurements
on the sol and thermal analysis of the resultant gel. The prepared powders were then
characterized using X-ray diffraction, FTIR, BET surface area analysis and transmission
electron microscopy.The third chapter presents a detailed discussion on the physico-chemical
characterization of the aqueous sol-gel derived doped titania. The effect of dopants such
as tantalum, gadolinium and ytterbium on the anatase to rutile phase transformation,
surface area as well as their influence on photoactivity is also included.
The fourth chapter demonstrates application of the aqueous sol-gel method in
developing titania coatings on porous alumina substrates for controlling the poresize for
use as membrane elements in ultrafiltration. Thin coatings having ~50 nm thickness and
transparency of ~90% developed on glass surface were tested successfully for self
cleaning applications.
Shaji, P N; Dr.George, Varghese K(Cochin University of Science And Technology, November 5, 2012)
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Abstract:
A study focusing on the identification of return generating factors and to
the extent of their influence on share prices the outcome will be a tool for
investment analysis in the hands of investors portfolio managers and mutual
funds who are mostly concerned with changing share prices. Since the study
takes into account the influence of macroeconomic variables on variations in
share returns by using the outcome the government can frame out suitable
policies on long term basis and that will help in nurturing a healthy economy
and resultant stock market. As every company management tries to maximize
the wealth of the share holders a clear idea about the return generating
variables and their influence will help the management to frame various
policies to maximize the wealth of the shareholders.
Description:
School of Management Studies
Cochin University of Science and Technology
Sheeja, N K; Surendran, Cherukodan(Indira Gandhi National Centre For The Arts,New Delhi, August 21, 2010)
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Abstract:
Newspapers cover a large amount of information everyday on topics of varied
interests. To a university, newspapers are essential components of
communication as they cover various happenings in a university. These items of
information are neither stored properly nor put in retrieval systems for future
use. The news and views appeared in newspapers can effectively be organized in
a digital library making use of open source software. The CUSAT digital library
(http://dspace.cusat.ac.in/dspace/) has organized some news items that
appeared in local newspapers about the university under a special community
named “CUSAT-News”. This article describes the methods of collecting,
selecting, organizing, providing access and preserving news items required by a
university using DSpace open source software.
Description:
IFLA international newspaper conference,2010,25-28 february