Investigation on mechanical behaviour of twisted natural fiber hybrid composite fabricated by vacuum assisted compression molding technique     

B. Vijaya Ramnath  S. Rajesh  C. Elanchezhian  A. Santosh Shankar  S. Pithchai Pandian  S. Vickneshwaran  R. Sundar Rajan 《Fibers and Polymers》2016,17(1):80-87

Nowadays, automotive, packaging and sport equipment industries are using natural fibre based composite materials as they are cheap, abundantly available and having a lot of ecological advantages. The main objective of this paper is to introduce a new concept of fibre twisting and to investigate the effect of twisting and the fibre orientation on the mechanical properties of bio degradable green composites. Here, the composites are fabricated by vacuum assisted compression molding technique in which the problems of hand lay process are eliminated. Here, two fibers namely twisted neem and twisted kenaf are sandwiched between layers of glass fibres to enhance the stiffness and strength of the laminates. Initially, the fibers are alkalized to increase the mechanical properties. The result shows that there is a significant improvement in mechanical properties of composites due to the presence of twisted fibers. It also shows the influence of fiber orientation on mechanical properties.  相似文献   

Eradication of virulent footrot from sheep and goats in an endemic area of Nepal and an evaluation of specific vaccination     

Egerton JR  Ghimire SC  Dhungyel OP  Shrestha HK  Joshi HD  Joshi BR  Abbott KA  Kristo C 《The Veterinary record》2002,151(10):290-295

Programmes based on the identification and treatment of cases and the culling of animals refractory to treatment had failed to eradicate virulent footrot from two districts in the western region of Nepal. From 1993 to 1996 vaccination against two endemic virulent strains of Dichelobacter nodosus was tested for its potential to contribute to the eradication of footrot from the region. Only sheep and goats which had been free of signs of footrot at three inspections at monthly intervals before their annual migration to alpine pastures were eligible for inclusion. From November 1992, the treatment of cases identified during inspections included the injection of specific vaccine. Successfully treated cases migrated with their flocks but were excluded from the vaccine trial. Non-responding cases were culled. Forty combined flocks of sheep and goats (approximately 9500 animals) were used initially to compare three vaccination regimens. Eleven flocks (sheep and goats) were treated with two doses of specific vaccine (group A), nine (sheep and goats) were treated with commercial vaccine followed by specific vaccine (group B) and 10 (sheep and goats) were treated with two doses of commercial vaccine (group C) in March to April 1993 before the annual migration; 10 flocks (sheep and goats) remained unvaccinated (group D). Only sheep and goats free of signs of footrot were allowed to migrate. Nevertheless, virulent footrot recurred in many flocks three months later. However, its prevalence was significantly lower in group A than in the other three groups combined. Groups A, B and C then received the specific vaccine before their migrations in 1994 to 1996; group D remained unvaccinated. The annual programme of inspection and identification and treatment of cases continued for seven years, but the vaccinations ceased after four years. There was no recurrence of virulent footrot after November 1993. After the first season the virulent strains of D nodosus used in the specific vaccine could no longer be isolated, although antigenically distinct, benign strains of the organism persisted in cases of benign footrot.  相似文献   

Congenital melanoma in a calf. A review and case report     

C G Sivadas  M K Nair  A Rajan  K M Ramachandran 《The British veterinary journal》1971,127(6):289-293

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On the non-occurrence of Ditylenchus dipsaci in India     

Rajan    Arjun Lal 《EPPO Bulletin》2005,35(1):37-41

On the basis of results of surveys, examination of materials collected through exploration trips for gene banks and research, phytosanitary inspection of germplasm material meant for export (in 1976/2003), published literature and crop protection databases, it is reported that, though congenial climatic conditions prevail and host crops are under regular production in the area, the important pest Ditylenchus dipsaci does not occur in India.  相似文献   

Does Nepal’s community forestry program improve the rural household economy? A cost–benefit analysis of community forestry user groups in Kaski and Syangja districts of Nepal     

Rajan Parajuli  Dhananjaya Lamichhane  Omkar Joshi 《Journal of Forest Research》2015,20(6):475-483

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Label-free, single-molecule detection with optical microcavities     

Armani AM  Kulkarni RP  Fraser SE  Flagan RC  Vahala KJ 《Science (New York, N.Y.)》2007,317(5839):783-787

Current single-molecule detection techniques require labeling the target molecule. We report a highly specific and sensitive optical sensor based on an ultrahigh quality (Q) factor (Q > 10(8)) whispering-gallery microcavity. The silica surface is functionalized to bind the target molecule; binding is detected by a resonant wavelength shift. Single-molecule detection is confirmed by observation of single-molecule binding events that shift the resonant frequency, as well as by the statistics for these shifts over many binding events. These shifts result from a thermo-optic mechanism. Additionally, label-free, single-molecule detection of interleukin-2 was demonstrated in serum. These experiments demonstrate a dynamic range of 10(12) in concentration, establishing the microcavity as a sensitive and versatile detector.  相似文献   

Gas-rich meteorites: possible evidence for origin on a regolith     

Macdougall D  Rajan RS  Price PB 《Science (New York, N.Y.)》1974,183(4120):73-74

The asymmetry of irradiation features of grains in the Kapoeta and Fayetteville meteorites suggests irradiation on a regolith before meteorite formation. Chondrules and broken grains require approximately 10(4) years of irradiation time between formation or fracturing and compaction into the meteorite. Shock erasure of tracks from irradiated Kapoeta feldspars requires a severe shock event during or after meteorite formation.  相似文献   

Improving fertilizer recommendations for Nepalese farmers with the help of soil-testing mobile van     

Sunil Pandey  Netra Prasad Bhatta  Prakash Paudel  Rajan Pariyar  Kiran Hari Maskey  Janardan Khadka 《Journal of Crop Improvement》2018,32(1):19-32

Smallholder farmers dominate agriculture in Nepal. These farmers have poor knowledge about agriculture and lack of support for soil management and integrated plant-nutrient systems. Focusing on the importance and need for soil-fertility management, a soil-testing mobile van program has recently been introduced in Nepal by Soil Management Directorate, Hariharbhawan. With the introduction of the mobile lab, famers can get their soil tested for nutrient deficiencies and fertilizer requirements at their doorsteps. Using mobile lab, spatial distributions of chemical properties, including pH, organic matter (OM), total nitrogen (N), available phosphorus (as P₂O₅), and available potassium (as K₂O) were examined in soil samples taken from the 0 to 15 cm depth from selected agricultural fields in eight different districts in the mid-hills and Terai regions of Nepal. Tests conducted on 1,479 soil samples in the soil-testing mobile van revealed the following: the mean soil OM ranged from 0.01 to 1.77%; total N content ranged from 0.01 to 0.08%; mean available P₂O₅ ranged from 16.47 to 197.82 kg ha^?1; and mean available K₂O ranged from 84.3 to 422.57 kg ha^?1. For each crop to be grown, farmers were provided with individual soil health reports and fertilizer recommendations (rate, amount, and type). This program not only allows scientists and farmers to work closely and share information but also serves as a model for the nation to successfully transfer technology for improving soil health and sustainability.  相似文献