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- Kasting, R., et al.
(author)
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Volatile constituents in leaves of parsley
- 1972
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In: Phytochemistry. - 0031-9422 .- 1873-3700. ; 11:7, s. 2277-2282
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Journal article (peer-reviewed)abstract
- Volatile chemicals obtained from the leaves of parsley, Petroselinum sativum by steam distillation, isopentane extraction, and head-space analysis were identified by GLC-MS. The presence in leaf oil of ?-pinene, ?-pinene, myrcene, ?-phellandrene, trans-?-ocimene, ?-terpinene, 1-methyl-4-isopropenyl benzene, and 1,3,8-p-menthatriene as shown by earlier investigators was confirmed. In the present studies, the number of volatile chemicals detected in the leaves was extended by an additional 42. Sniffing tests of effluent from a gas chromatograph of a concentrate from parsley leaves showed that 1,3,8-p-menthatriene was only one of several compounds that gave a parsley-like aroma. © 1972.
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- Lundberg, Bengt, et al.
(author)
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Optimum transmission of elastic waves through joints
- 1979
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In: Wave motion. - : Elsevier BV. - 0165-2125 .- 1878-433X. ; 1:3, s. 193-200
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Journal article (peer-reviewed)abstract
- An elastic wave transmitting system (e.g. a nonuniform elastic rod) consisting of an input section with constant impedance, a joint with variable impedance, and an output section with constant impedance is considered. The efficiency of energy transmission (the ratio of transmitted to incident elastic wave energy) is determined and the following optimization problem is solved for two sample cases: Given the properties of the wave transmitting system and a limited duration of the incident wave, determine the shape of this wave such that the efficiency of energy transmission is maximized. In the first case (a joint with constant impedance) the optimization problem leads to a matrix eigenvalue problem. In the second case (a joint with concentrated mass) it leads to an eigenvalue problem for an integral equation. The efficiencies obtained for the optimum incident waves are compared with those obtained for rectagular incident waves an it is found that the differences are generally small. The results, which are discussed with particular reference to the transmission of elastic wave energy through drill rod joints, can also be interpreted for e.g. shallow water waves and electromagnetic waves in a transmission line.
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- Watanabe, A, et al.
(author)
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Gunnar Fant 60 years
- 1979
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In: TMH-QPSR. ; 20:2, s. 1-45
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Journal article (peer-reviewed)
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