930 research outputs found
Weibull approach to brake pad wear analysis in the Nigerian market
In this study, we evaluated the wear properties of four brands of brake pad available in the Nigerian
market. In particular, we assessed the tribo performance and service life of the brake pads. We purchased four
commercial brands of brake pads used in light duty cars and coded them as AU, SN, TY and SM, respectively.
A small piece of the brake pad lining materials was carefully chiseled from the back plates to obtain samples for
the experiments. We conducted Brinell hardness tests using a tensometer and a pin-on-disc test rig to determine the coefficient of friction and the wear characteristics of the materials. We then correlated the wear on each set of brake pads with the running time and used WeibullтАЩs equation to determine average service life. Sample TY exhibited the highest hardness value (29.09) and sample SN the lowest (10.05). The determined coefficients of friction ranged between 0.3тАУ0.36, with sample AU exhibiting the lowest value and sample SM the highest. Sample SN showed the lowest wear rate of 3.53 ├Ч 109 g/min, while the wear rates of samples TY, AU, and SM were 5.64 ├Ч 108, 8.19 ├Ч 109, and 2.10 ├Ч 108 g/min, respectively. The relative service life of samples SN, TY, and AU were similar, with average values of 2778.09, 2725.41, and 2717.34 min, respectively, and SM had a relatively low service life (2017.82 min). We conclude that the overall performances of Nigerian brake pads do not meet all the specifications for friction materials used in road vehicle brake linings and pads
Varicella-zoster virus transverse myelitis in an immunocompetent patient
Transverse myelitis is one of the rare neurological complications of Varicella-Zoster Virus (VZV) infection in immuno-competent. We report a 26-year-old immuno-competent gentleman who developed virologically confirmed myelopathy caused by VZV which improved with steroids and acyclovir leaving no residual neurological deficits
CMFRI establishes a Pilot Farm in the outfall channel of the Coastal Gujarat Powers Ltd., Mundra, Kutch District, Gujarat
A customized
sea cage for the running waters of the
outfall channel was designed and
fabricated by the scientists of the Regional
Centre, Veraval. Two square cages of 5m
size made of Galvanised Iron pipes of 1.5"
size, with base collars and hand rails was
fabricated at the site and mounted with
the square shape culture nets of suitable
size procured
Rough triggerfish, Canthidermis maculata from Gujarat coast
A specimen of the Rough triggerfish,
Canthidermis maculata (Bloch, 1786) was landed
by a multiday trawler on 25th November 2015 at
Mangrol Fisheries Harbour, Gujarat. The specimen
was brownish grey in colour with characteristic
white spots all over the body including the head. It
measured 309 mm and 256 mm in Total length and
Standard length respectively with a weight of 580 g
(Fig. 1). The fish is usually found in areas having
sandy, muddy or rocky bottoms at a depth range of
50-100 m and is reported from the Western Indian
Ocean
тАШPakshi PittiтАЩ: a robust haven for pelagic birds in the Indian Ocean
India, a land of distinct climatic and geographic zones,
supports a remarkable diversity of avian fauna within both
its mainland and its seas. There are over 1200 species of
birds recorded in India, with the majority occurring in
the mainland (Praveen et al., 2016). Surrounded by extensive
marine zones on its three sides, territorial waters and
marginal seas around India form seamless habitats for a
significant number of marine avian species. Seventy species
of marine birds are observed in the region (BirdLife
International 2015). These include predominantly open
oceanic species like frigate birds, tropicbirds, shearwaters
and petrels which are winter visitors or vagrants, but birds
like gulls and terns are more commonly found along the
coastal waters of India
Ring seine fishery of Kerala: An overview
Among the various fishing gears employed for
pelagic schooling fishes along the Kerala coast,
seines are the most efficient. Contribution of ring
seine to total marine fish landings of Kerala has
steadily increased since its introduction during the
early eighties. It was 21.4 % in the nineties rising to
36.7 % during the period 2000-2004 and contributing
more than 50 % since then. In recent years, about
90 % of the oil sardine and about 60 % of the
mackerel landed in Kerala were caught in ring
seines. Ring seines were introduced during the early
eighties by traditional fishers of Alappuzha District
which became highly successful
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