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9Omethylfusarubin was isolated from a novel source, Fusarion oxysporum, and evaluated for its phytotoxic and chlorotic inducing properties in plants as well as its potential as an antineoplastic agent.


This note shows that for a BVP of Poisson's equation withQm(u, v) as its source function, a direct evaluation of some integrals yields the same exact results as obtained by similarity analysis.


The nonlinear PDEs consist of a heat equation with the Joule heating as a source and a current conservation equation with temperaturedependent electrical conductivity.


In order to get these secondorder error estimates, the Joule heating source is used in a changed equivalent form.


A nonlinear degenerate parabolic equation with nonlocal source

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 1. The Source of Minkiang.  (1)过访岷江源 (2)岷江峡谷地形地质一暼(3)地震后峡谷实察记要(4)市场堡壘相肓望之形勝(5)峡谷之将来  By means of Schmidt's "shaking method", the emanation content of certain springs and artasian wells in the Peiping area was tested. Radon, thoron, or both together, were found in these water sources. Tests were made both in the spring of 1932 and 1935. No noticeable variation of the emanation content in these sources has been observed.  应用斯密特之“摇动法,”测定北平邻近之泉水,如汤山温泉,温泉,玉泉山水及清华,燕京、协和医诸校内自流井所含之射气量。诸泉源或仅含镭射气,钍射气,或二种射气皆有之。民国二十一年与二十四年,曾测验诸泉水各一次,所含之射气量,绝少改变。  By surrounding a photoneutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced βactivity. By measuring the activity of silver and the apparent absorption coefficient... By surrounding a photoneutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced βactivity. By measuring the activity of silver and the apparent absorption coefficient of the resonance neutrons in a thin silver absorber, the total width of the resonance levels effective to neutron capture and located in the above spectrum is estimated. Let τ He the average value of one half of the halfvalue width of the resonance levels, expressed in volts, and n be the number of resonance levels here concerned. We find nτ=260 volts for the silver nuclei of half period 22" if the energies of the primary neutrons are taken to be 2x 105 volts. Knowing nτ, we can evaluate the average spacing between adjacent resonance levels effective to neutron capture by giving a plausible value to τ. We find a spacing of the order 80800 volts if τ be given the value 0.11.0 volt. This result is in good accord with the recent theoretical calculation of Bethe and also with observations of resonance groups in the low energy region.  把‘镭—铍’所产生的‘光中子’,穿过一层半厘米厚的白蜡,我们便得到一‘连续的中子谱’。他们中间有些中子,能和银的原子核起‘共振作用’,因此可以被银片吸收,而产生‘人工放射银’先测量人工放射的强度和‘共振中子’在银片中的吸收率,再应用原子核内共振能层的宽度,我们便可以求出银的原子核内‘共振能层’的密度大约共振能在零和二十万伏特中间,平均每隔一二百伏特便有一可以吸收质子的共振能层,和理论很相符合。   << 更多相关文摘 
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