排序方式: 共有34条查询结果,搜索用时 140 毫秒
31.
Liviu Marsavina Tomasz Sadowski Marcin Kneć Radu Negru 《International Journal of Non》2010,45(10):969-975
The influence of impregnation on mechanical properties of polyurethane foams at room temperature has been experimentally evaluated in both static and impact loading conditions. The impregnation layer increases the flexural modulus and changes the foam behaviour at impact. For un-impregnated foam the energy absorbed to fracture is equal to the impact energy, while for the impregnated specimens the energy absorbed to fracture is approximately 80% of the impact energy, which indicated that the other part of the impact energy was consumed for internal damage. The same amount of energy was reached for both static and impact tests, but different shapes of energy versus displacement curves were obtained. For notched specimens under impact load, the effect of impregnation is cancelled and identical behaviour was obtained for un-impregnated and impregnated specimens. 相似文献
32.
G.N. Kaluđerović F.W. Heinemann N.Ž. Knežević S.R. Trifunović T. J. Sabo 《Journal of chemical crystallography》2004,34(3):185-189
The title compound was obtained by a synthesis from ethylenediamine-N,N-di-3-propanoic acid dihydrochloride (H2eddp2HCl) and potassium hexachloropalladate(IV) (molar ratio 1:1, in water). Its structure has been determined by single-crystal X-ray diffraction: monoclinic space group P21/n, a = 8.198(1), b = 10.282(1), c = 9.080(1) Å, = 103.62(1)°, V = 743.9(2) Å3, and Z = 2. The dianionic complex has a square-planar coordination geometry with four chloro ligands, and ethylenediamine-N,N-di-3-propanoic acid as dication in the second coordination sphere. This is the first reported Pd(II) structure with uncoordinated H2eddp. 相似文献
33.
J. Knežević-Miljanović 《Differential Equations》2011,47(1):149-152
We prove a number of theorems on asymptotic properties of solutions of the equation y″+x
a
y
σ
= 0, σ < 0. First, we prove the absence of solutions on (x
1, +∞) for some values of the parameters a and σ; after that, we obtain asymptotic formulas for solutions defined on (x
0, +∞). 相似文献
34.
A supramolecular assembly for visible light responsive release of cargo molecules is presented. Sulforhodamine 101 was loaded inside the mesopores of mercaptopropyl-functionalized mesoporous silica nanoparticles (MP-MSN) and entrapped by mercaptopropyl-coordinated Ru(bpy)(2)(PPh(3))-moieties. Irradiation with visible light triggers the release of capping species and loaded molecules. 相似文献