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21.
Methyl 2-Br-2-Cl-carboxylates afford 2-alkyl-2-Cl-4-Br-carboxylates in fair yields by reaction with terminal alkenes, under mild conditions, through a radical process promoted by CuBr/Fe0 in DMF/CH2C12. 相似文献
22.
C. Artale S. Fermepin M. Forti M. Latino M. Quintero L. Granja J. Sacanell G. Polla P. Levy 《Physica B: Condensed Matter》2009,404(18):2760-2762
We present the synthesis and characterization of the La2/3Sr1/3MnO3 manganite in the form of tapes using polymethyl methacrylate (PMMA) as binder. We have studied their electric and magnetic properties as a function of temperature and magnetic field. The magnetization results have been shown to be dominated by the intrinsic magnetic properties of the manganite. Resistivity measurements showed an insulating behavior in the whole range of temperatures measured, indicating that the percolation threshold of manganite grains has not been reached even for the sample with 35% of PMMA relative content. The obtained magnetoresistance is largest in the sample with 35% of PMMA relative content. 相似文献
23.
Ambrosio M Antolini R Auriemma G Baker R Baldini A Bam B Barbarino GC Barish BC Battistoni G Bellotti R Bemporad C Bernardini P Bilokon H Bisi V Bloise C Bower C Bussino S Cafagna F Calicchio M Campana D Carboni M Corona A Cecchini S Cei F Chiarella V Cormack R Coutu S DeCataldo G Dekhissi H DeMarzo C De Vincenzi M Di Credico A Diehl E Erriquez O Favuzzi C Forti C Fusco P Giacomelli G Giannini G Giglietto N Grassi M Green P Grillo A Guarino F Guarnaccia P Gustavino C Habig A Heinz R Hong JT 《Physical review D: Particles and fields》1994,50(5):3046-3058
24.
Let E be a real inner product space of dimension at least 2. Suppose ? : E → ? satisfies If there exist a neighbourhood U of the origin and γ ∈ (0, 1/4) such that ?(U) ? (?γ,γ) + ?, then there exist a real constant c and a continuous linear functional g : E → ? such that Suppose Φ : E → ? satisfies If there exist a neighbourhood U of the origin and β ∈ (0, +∞) such that ¦Φ(x)¦ ≤ β?(Φ(x)) for every x ∈ U, then either Φ vanishes on E? {0} or there exist additive functions a : ? → ? and A : E → ?, a real constant c and a continuous linear functional g : E → ? such that 相似文献
25.
The microwave spectrum of four isotopically substituted species of AsCl3 in the frequency range 100–220 GHz has been investigated. Four rs structures were determined resulting in the following average values of the bond length and bond angle:The harmonic force field of AsCl3 has been calculated and compared with that obtained without the aid of the centrifugal distortion constants. 相似文献
26.
27.
The rotational constants and quartic centrifugal distortion constants for NO235Cl and NO237Cl have been determined from an analysis of rotational transitions in the microwave and millimeter wave regions between 8.2–40 and 90–120 GHz, respectively.The values of the in-plane force constants in the general harmonic potential field have been obtained by combination of infrared and microwave data. Vibrational frequencies of 14NO2Cl and 15NO2Cl, inertia defects of NO235Cl in the excited vibrational states v3 = 1 and v5 = 1, and first-order centrifugal distortion constants of NO237Cl are the experimental data used in the least-squares fitting determination of force constants. 相似文献
28.
Forti Endrina S. El Awad Azrak Sami M. Ng Xin Y. Cho Whirang Schueneman Gregory T. Moon Robert J. Fox Douglas M. Youngblood Jeffrey P. 《Cellulose (London, England)》2021,28(10):6449-6465
Cellulose - In this work, water-soluble polymers were screened through solution casting and polyvinyl alcohol (PVA) and poly(2-ethyl-2-oxazoline) (PEOX) were found as reinforcement agents for... 相似文献
29.
5-Amino-2,3,6,7-tetrahydrothiocines were reacted with arylazides yielding 1-aryl-9a-amino-1,3a,4,5,7,8,9,9a-octahydrothiocino[4,5-d]-1,2,3-triazoles which could be deaminated to 1-aryl-1,4,5,7,8,9-hexahydrothiocino-[4,5-d]-1,2,3-triazoles. Similarly, the above enamines yielded, with nitrile oxides, 3-aryl-9a-amino-3a,4,5,8,9,9a-hexahydrothiocino[4,5-d]isoxazoles which were transformed with acids into 3-aril-4,5,8,9-tetrahydrothiocino-[4,5-d]isoxazoles. 相似文献
30.
Ahlen S Ambrosio M Antolini R Auriemma G Baker R Baldini A Barbarino GC Barish BC Battistoni G Bellotti R Bemporad C Bernardini P Bilokon H Bisi V Bloise C Bussino S Cafagna F Calicchio M Campana P Campana D Carboni M Cecchini S Cei F Chiarella V Chiera C Cobis A Cormack R Corona A Coutu S DeCataldo G Dekhissi H DeMarzo C De Vincenzi M Di Credico A Diehl E Erriquez O Favuzzi C Ficenec D Forti C Foti L Fusco P Giacomelli G Giannini G Giglietto N Giubellino P Grassi M Green P Grillo A Guarino F 《Physical review letters》1992,69(13):1860-1863