Natural fibers are largely divided into two categories depending on their origin: plant based and... more Natural fibers are largely divided into two categories depending on their origin: plant based and animal based. Plant based natural jute fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated by compression molding. Bending strength (BS), bending modulus (BM), tensile strength (TS), Young’s modulus (YM), and impact strength (IS) of the composites were found 44.2 MPa, 2200 MPa, 41.3 MPa, 750 MPa and 12 kJ/m2, respectively. Animal based natural B. mori silk fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated in the same way and the mechanical properties were compared over the silk based composites. TS, YM, BS, BM, IS of silk fiber reinforced polypropylene composites were found 55.6 MPa, 760 MPa, 57.1 MPa, 3320 MPa and 17 kJ/m2 respectively. Degradation of composites in soil was measured upto twelve weeks. It was found that plant based jute fiber/PP composite losses its strength more than animal based silk fiber/PP composite for the same period of time. The comparative study makes it clear that mechanical properties of silk/PP composites are greater than those values of jute/PP composites. But jute/PP composites are more degradable than silk/PP composites i.e., silk/PP composites retain their strength for a longer period than jute/PP composites.
The reaction of ground-state NH with H 2 has been studied in a high-temperature photochemistry (H... more The reaction of ground-state NH with H 2 has been studied in a high-temperature photochemistry (HTP) reactor. The NH(X 3 Σ) radicals were generated by the 2-photon 193 nm photolysis of NH 3 , following the decay of the originally produced NH(A 3 Π) radicals. Laser-induced fluorescence on the NH(A 3 Π-X 3 Σ 0, 0) transition at 336 nm was used to monitor the progress of the reaction. We obtained k (833-1432 K) = 3.5 × 10 −11 exp(−7758 K/T ) cm 3 molecule −1 s −1 , with ±2σ precision limits varying from 12 to 33% and corresponding accuracy levels from 23 to 39%. This result is in excellent agreement with that of Rohrig and Wagner [Proc. Combust. Inst. 25 (1994) 975] and the data sets can be combined to yield k (833-1685 K) = 4.4 × 10 −11 exp(−8142 K/T ). Starting with this agreement, it is argued that their rate coefficients for NH + CO 2 could not be significantly in error [Proc. Combust. Inst. 25 (1994) 975]. This, combined with models of several combustion systems, indicates that HNO + CO cannot be the products, contrary to their suggestion [Proc. Combust. Inst. 25 (1994) 975]. Ab initio calculations have been performed which confirm this conclusion by showing the barriers leading to these products to be too high compared to the measured activation energies. The calculations indicate the likelihood of formation of adducts, of low stability. These then may undergo further reactions. The NH + H 2 O reaction is briefly discussed and it is similarly argued that HNO + H 2 cannot be the products, as had been previously suggested.
... The measured branching ratio and translational energy release suggest that the reaction proce... more ... The measured branching ratio and translational energy release suggest that the reaction proceeds via a long-lived complex formed by insertion. Publication details. Download, http://dx.doi.org/10.1155/1994/86820. Publisher, Hindawi Publishing Corporation. ...
Canadian Journal of Chemistry-revue Canadienne De Chimie, 1994
Page 1. O(~P~) atom formation from photodissociation of ozone in the visible and ultraviolet regi... more Page 1. O(~P~) atom formation from photodissociation of ozone in the visible and ultraviolet region SAYED MOHAMMED SHAMSUDDIN, YOUSUKE INAGAKI, YUTAKA MATSUMI, AND MASAHIRO KAWASAKI' Institlcte for Electronic ...
Natural fibers are largely divided into two categories depending on their origin: plant based and... more Natural fibers are largely divided into two categories depending on their origin: plant based and animal based. Plant based natural jute fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated by compression molding. Bending strength (BS), bending modulus (BM), tensile strength (TS), Young’s modulus (YM), and impact strength (IS) of the composites were found 44.2 MPa, 2200 MPa, 41.3 MPa, 750 MPa and 12 kJ/m2, respectively. Animal based natural B. mori silk fiber reinforced polypropylene (PP) matrix composites (20 wt% fiber) were fabricated in the same way and the mechanical properties were compared over the silk based composites. TS, YM, BS, BM, IS of silk fiber reinforced polypropylene composites were found 55.6 MPa, 760 MPa, 57.1 MPa, 3320 MPa and 17 kJ/m2 respectively. Degradation of composites in soil was measured upto twelve weeks. It was found that plant based jute fiber/PP composite losses its strength more than animal based silk fiber/PP composite for the same period of time. The comparative study makes it clear that mechanical properties of silk/PP composites are greater than those values of jute/PP composites. But jute/PP composites are more degradable than silk/PP composites i.e., silk/PP composites retain their strength for a longer period than jute/PP composites.
The reaction of ground-state NH with H 2 has been studied in a high-temperature photochemistry (H... more The reaction of ground-state NH with H 2 has been studied in a high-temperature photochemistry (HTP) reactor. The NH(X 3 Σ) radicals were generated by the 2-photon 193 nm photolysis of NH 3 , following the decay of the originally produced NH(A 3 Π) radicals. Laser-induced fluorescence on the NH(A 3 Π-X 3 Σ 0, 0) transition at 336 nm was used to monitor the progress of the reaction. We obtained k (833-1432 K) = 3.5 × 10 −11 exp(−7758 K/T ) cm 3 molecule −1 s −1 , with ±2σ precision limits varying from 12 to 33% and corresponding accuracy levels from 23 to 39%. This result is in excellent agreement with that of Rohrig and Wagner [Proc. Combust. Inst. 25 (1994) 975] and the data sets can be combined to yield k (833-1685 K) = 4.4 × 10 −11 exp(−8142 K/T ). Starting with this agreement, it is argued that their rate coefficients for NH + CO 2 could not be significantly in error [Proc. Combust. Inst. 25 (1994) 975]. This, combined with models of several combustion systems, indicates that HNO + CO cannot be the products, contrary to their suggestion [Proc. Combust. Inst. 25 (1994) 975]. Ab initio calculations have been performed which confirm this conclusion by showing the barriers leading to these products to be too high compared to the measured activation energies. The calculations indicate the likelihood of formation of adducts, of low stability. These then may undergo further reactions. The NH + H 2 O reaction is briefly discussed and it is similarly argued that HNO + H 2 cannot be the products, as had been previously suggested.
... The measured branching ratio and translational energy release suggest that the reaction proce... more ... The measured branching ratio and translational energy release suggest that the reaction proceeds via a long-lived complex formed by insertion. Publication details. Download, http://dx.doi.org/10.1155/1994/86820. Publisher, Hindawi Publishing Corporation. ...
Canadian Journal of Chemistry-revue Canadienne De Chimie, 1994
Page 1. O(~P~) atom formation from photodissociation of ozone in the visible and ultraviolet regi... more Page 1. O(~P~) atom formation from photodissociation of ozone in the visible and ultraviolet region SAYED MOHAMMED SHAMSUDDIN, YOUSUKE INAGAKI, YUTAKA MATSUMI, AND MASAHIRO KAWASAKI' Institlcte for Electronic ...
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