Achamma, Kurian; Bindhu, C V; Harilal, S S; Issac, Riju C; Nampoori, V P N; Vallabhan, C P G(Pramana, November , 1994)
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Abstract:
A simple method based on laser beam deflection to study the variation of diffusion
coefficient with concentration in a solution is presented. When a properly fanned out laser
beam is passed through a rectangular cell filled with solution having concentration gradient,
the emergent beam traces out a curved pattern on a screen. By taking measurements on the
pattern at different concentrations, the variation of diffusion coefficient with concentration can
be determined.
Shalin Saleem; Dr.Sanil Kumar, K V(Cochin University Of Science And Technology, October 16, 2012)
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Abstract:
Satellite remote sensing is being effectively used in monitoring the ocean
surface and its overlying atmosphere. Technical growth in the field of satellite sensors
has made satellite measurement an inevitable part of oceanographic and atmospheric
research. Among the ocean observing sensors, ocean colour sensors make use of
visible band of electromagnetic spectrum (shorter wavelength). The use of shorter
wavelength ensures fine spatial resolution of these parameters to depict oceanographic
and atmospheric characteristics of any region having significant spaio-temporal
variability.
Off the southwest coast of India is such an area showing very significant
spatio-temporal oceanographic and atmospheric variability due to the seasonally
reversing surface winds and currents. Consequently, the region is enriched with
features like upwelling, sinking, eddies, fronts, etc. Among them, upwelling brings
nutrient-rich waters from subsurface layers to surface layers. During this process
primary production enhances, which is measured in ocean colour sensors as high
values of Chl a. Vertical attenuation depth of incident solar radiation (Kd) and Aerosol
Optical Depth (AOD) are another two parameters provided by ocean colour sensors.
Kd is also susceptible to undergo significant seasonal variability due to the changes in
the content of Chl a in the water column. Moreover, Kd is affected by sediment
transport in the upper layers as the region experiences land drainage resulting from
copious rainfall. The wide range of variability of wind speed and direction may also
influence the aerosol source / transport and consequently AOD.
The present doctoral thesis concentrates on the utility of Chl a, Kd and AODprovided by satellite ocean colour sensors to understand oceanographic and
atmospheric variability off the southwest coast of India. The thesis is divided into six
Chapters with further subdivisions
Description:
faculty
of Marine Sciences,Cochin University of Science and Technology
Bright Singh, I S; Seena, Jose; Rosamma, Philip; Mohandas, A; Jayesh, P(Elsevier, December 26, 2010)
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Abstract:
Lack of shrimp cell lines has hindered the study of pollutants which adversely affects shrimp health and
its export value. In this context a primary haemocyte culture developed from Penaeus monodon was
employed for assessing the cytotoxicity and genotoxicity of two heavy metal compounds, cadmium
chloride and mercuric chloride and two organophosphate insecticides, malathion and monocrotophos.
Using MTT assay 12 h IC50 values calculated were 31.09 16.27 mM and 5.52 1.16 mM for cadmium
chloride and mercuric chloride and 59.94 52.30 mg l 1 and 186.76 77.00 mg l 1 for malathion and
monocrotophos respectively. Employing Comet assay, DNA damage inflicted by these pollutants on
haemocytes were evaluated and the pollutants induced DNA damage in >60% of the cells. The study
suggested that haemocyte culture could be used as a tool for quantifying cytotoxicity and genotoxicity of
aquaculture drugs, management chemicals and pollutants
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