COOPER, EUGENE E., and RAYMOND E. GIRTON. (Purdue U., Lafayette, Ind.) Physiological effects of manganese deficiency related to age in soybeans (Glycine max). Amer. Jour. Bot. 50(2): 105-110. Illus. 1963.-Soybean plants when grown in manganese-deficient silica sand cultures developed typical manganese deficiency symptoms of interveinal chlorosis and necrosis. Physiological effects including depression of photosynthesis, respiration, growth, and relative chlorophyll contents were studied. The depression of photosynthesis was not always proportional to reduced chlorophyll content. This is taken to indicate the importance of manganese in reactions concerned in photosynthesis in addition to chlorophyll formation. Age of leaves related to position on the plant and actual aging of the plants with time sometimes produced different results when related to photosynthetic rates, which mainly decreased with age of plants. Chlorophyll content in young leaves increased with plant age, except for a consistent decrease after leaf maturity. Respiration rates generally decreased with age. For the most part, the effects of aging on photosynthesis, respiration, and chlorophyll contents were the same for soybeans as for other species reported in the Iitcrature. , 1
The response of water and 20 ppm. solutions of Separan AP-30 and Polyox WSR 301 to the periodic motion of a thin sleeve was measured using a laser Doppler velocimeter. The sleeve was moved in an axial direction by an external coupling a t frequencies from '/4 to 1.0 Hz and a t amplitudes of h t o 2 in. The flow field downstream of the disturbance was found to consist of three regions: 1. a near field with a separation wake from the sleeve moving toward the pipe centerline; 2. an intermediate field in which alternate laminar and turbulent slugs passed a point; and 3. a far field with decaying turbulent flow. Differences in the behavior of water flows and polymer flows appeared i n each region. In the near field, wakes spread faster in water flows. In the intermediate field, the laminar slugs disappeared into turbulence more rapidly in water flows. And in the far field, the turbulence was not as developed in the polymer flows.Detailed statistical evaluations were made on the signals in each region for a Reynolds number of 2000. The response of the dilute polymer solutions appeared to be governed by the initial interaction with the sleeve. Fewer high frequencies were generated than in the pure solvent so the periodic disturbance persisted downstreom. In pure water the eddies from the separation wake interacted strongly with the periodic disturbance leading to rapid decay of the periodic portion. Shear rates were not high enough to attribute the dilute polymer differences to vixoelastic effects.
Impinging flow from jet engine exhaust on runway joint seals creates an aerothermoacoustic environment consisting of fluctuating pressure (acoustical and aerodynamic) and incident gas temperature which rapidly increases with time. Fluctuating pressure at the surface of a joint seal on a runway was measured with microphones and low pressure transducers positioned along the runway centerline. Temperatures were measured with thermocouples imbedded within the seal and on the surface, along the runway centerline and at several sideline distances. Pressure and temperature data were recorded during aircraft takeoff and landing operations. Measurements indicated incident noise pressure levels of approximately 164 dB re. 20 microPa, surface temperatures over 155 ° C and seal internal temperatures of 100 °C. Fluctuating velocity of the seal was calculated, treating the seal as a fluid flowing between parallel walls. Energy absorption rate was found to equal 1538 Watts/m2, 8.5% of the power available from the incident fluctuating pressure field. Thermal energy through convective heat transfer was absorbed at 34,000 Watts/m2, 95.7% of total energy absorption, far in excess of energy absorbed from the fluctuating pressure.
A numerical simulation of the aerothermal characteristics of a gas turbine engine test cell is presented. The three-dimensional system is modeled using the PHOENICS computational fluid dynamics code. Results predict the velocity field, temperatures, pressures, kinetic energy of turbulence, and dissipation rates of turbulent kinetic energy. Numerical results from two versions, a cartesian coordinate model and a body fitted coordinate model, are compared to experimental data. The comparison shows good quantitative and very good qualitative agreement, suggesting that numerical modeling would be useful in the preliminary design of gas turbine test facilities.
Jet engine exhaust flow impinging on runway joint seals creates an aerothermoacoustic environment consisting of fluctuating pressure (acoustical and hydrodynamic) and incident gas temperature rapidly increasing with time. Fluctuating pressure at the surface of a joint seal on a runway was measured with microphones and low-pressure transducers positioned along the runway centerline. Temperatures were measured with thermocouples imbedded within the seal and on the surface, along the runway centerline and at several sideline distances. Pressure and temperature data were recorded during aircraft takeoff and landing operations. Measurements indicated incident noise pressure levels of approximately 164 dB re: 20 μPa, surface temperatures over 155 °C, and seal internal temperatures of 100 °C. Fluctuating velocity of the seal was calculated, treating the seal as a fluid flowing between parallel walls. Energy absorption rate was found to equal 850 W/m2, 4.7% of the power available from the incident fluctuating pressure field. Thermal energy through convective heat transfer was absorbed at 34 000 W/m2, 97.5% of total energy absorption.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.