Pine wilt is a serious and fatal disease in pine forests. It is caused by the pine wood nematode, Bursaphelenchus xylophilus, transmitted by the Japanese saw beetle Monochamus alternatus. Control of this disease depen...Pine wilt is a serious and fatal disease in pine forests. It is caused by the pine wood nematode, Bursaphelenchus xylophilus, transmitted by the Japanese saw beetle Monochamus alternatus. Control of this disease depends on reducing its vector population. The public is demanding environmentally friendly control methods and biological control has become increasingly seen as an impor-tant, safe and effective approach. Through our investigations both in the field and by breeding in our laboratory, a new predator of M. alternatus, Tetrigus lewisi （Coleoptera： Elateridae）, was found for the first time in China. Given our continuous observations, we are assured that the predatory behavior of the elater can be separated into four parts, i.e., foraging and sensing, killing, eating and excre-tion. They always took several hours to eat the preys that have been killed momentarily. We finally found that most of the elaters preferably attacked in the stomach and abdomen of the larva of M. alternatus.展开更多
The fractional resonance absorption ε(0) in transmission Mossbauer spectroscopy is defined as a relative number of the absorbed γ-ray, and regarded as a measure of Mossbauer effect. The absorption linewidth Λ a , a...The fractional resonance absorption ε(0) in transmission Mossbauer spectroscopy is defined as a relative number of the absorbed γ-ray, and regarded as a measure of Mossbauer effect. The absorption linewidth Λ a , as it is usually suggested, is nearly equal to the emission linewidth, Λ s , and such an approximation leads to a extremely simplified expression ε(0), depending on neither Λ s nor Λ a . We consider the general case Λ s ≠Λ a , and obtain an exact expression for ε(0) which is given in the present paper. This expression ε(0), as a function oft a, Λ s , Λ a , is figured and discussed.展开更多
[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in ...[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in principal herb S. cusia and chlorogenic acid in minister drug Lonicera japonica Thunb. as dissolution indices,the effects of ultrafine comminution on the dissolution degree of compound feed additive of S. cusia were analyzed. [ Result] The dissolution degree of adenosine and chlorogenic acid in ultra micro particles were obviously higher than that of common particles. Ultrafine comminution could significantly quicken the dissolution rate of adenosine and chlorogenic acid in compound feed additive of S. cusia, shorten the extraction time, avoid the breakage of active components in long-time extraction process,and meanwhile saved the energy greatly. [ Conclusion] The ultrafine comminution technology could obviously increase the dissolution degree of active components in compound feed additive of S. cusia.展开更多
If recoilless fraction fa is available, the optimum absorber thickness dopt can be calculated by maximizing the signal to noise ratio or Q factor. In this work,an approach presented is to get experimental Qexp as a fu...If recoilless fraction fa is available, the optimum absorber thickness dopt can be calculated by maximizing the signal to noise ratio or Q factor. In this work,an approach presented is to get experimental Qexp as a function of the thickness,andthen fitting Qexp by its theoretical expression gives fa value. At last the dopt value is deduced from a maximum on the fitted curve.In such a way, thicknesses of six specimens with quadrupole or magnetic hyperfinc splitting were optimized.展开更多
文摘Pine wilt is a serious and fatal disease in pine forests. It is caused by the pine wood nematode, Bursaphelenchus xylophilus, transmitted by the Japanese saw beetle Monochamus alternatus. Control of this disease depends on reducing its vector population. The public is demanding environmentally friendly control methods and biological control has become increasingly seen as an impor-tant, safe and effective approach. Through our investigations both in the field and by breeding in our laboratory, a new predator of M. alternatus, Tetrigus lewisi （Coleoptera： Elateridae）, was found for the first time in China. Given our continuous observations, we are assured that the predatory behavior of the elater can be separated into four parts, i.e., foraging and sensing, killing, eating and excre-tion. They always took several hours to eat the preys that have been killed momentarily. We finally found that most of the elaters preferably attacked in the stomach and abdomen of the larva of M. alternatus.
文摘The fractional resonance absorption ε(0) in transmission Mossbauer spectroscopy is defined as a relative number of the absorbed γ-ray, and regarded as a measure of Mossbauer effect. The absorption linewidth Λ a , as it is usually suggested, is nearly equal to the emission linewidth, Λ s , and such an approximation leads to a extremely simplified expression ε(0), depending on neither Λ s nor Λ a . We consider the general case Λ s ≠Λ a , and obtain an exact expression for ε(0) which is given in the present paper. This expression ε(0), as a function oft a, Λ s , Λ a , is figured and discussed.
基金funded by Guangdong Science and Technology Study Program(2010B090400529)
文摘[Objective] The research aimed to explore the effects of comminution technology on the dissolution of active components from compound feed additive of Strobi/anthes cusia. [Method] Using active component adenosine in principal herb S. cusia and chlorogenic acid in minister drug Lonicera japonica Thunb. as dissolution indices,the effects of ultrafine comminution on the dissolution degree of compound feed additive of S. cusia were analyzed. [ Result] The dissolution degree of adenosine and chlorogenic acid in ultra micro particles were obviously higher than that of common particles. Ultrafine comminution could significantly quicken the dissolution rate of adenosine and chlorogenic acid in compound feed additive of S. cusia, shorten the extraction time, avoid the breakage of active components in long-time extraction process,and meanwhile saved the energy greatly. [ Conclusion] The ultrafine comminution technology could obviously increase the dissolution degree of active components in compound feed additive of S. cusia.
文摘If recoilless fraction fa is available, the optimum absorber thickness dopt can be calculated by maximizing the signal to noise ratio or Q factor. In this work,an approach presented is to get experimental Qexp as a function of the thickness,andthen fitting Qexp by its theoretical expression gives fa value. At last the dopt value is deduced from a maximum on the fitted curve.In such a way, thicknesses of six specimens with quadrupole or magnetic hyperfinc splitting were optimized.
