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981.
Stability of Periodic Orbits and Return Trajectories of Continuous Multi-valued Maps on Intervals
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Let I be a compact interval of real axis R, and(I, H) be the metric space of all nonempty closed subintervals of I with the Hausdorff metric H and f : I → I be a continuous multi-valued map. Assume that Pn =(x_0, x_1,..., xn) is a return tra jectory of f and that p ∈ [min Pn, max Pn] with p ∈ f(p). In this paper, we show that if there exist k(≥ 1) centripetal point pairs of f(relative to p)in {(x_i; x_i+1) : 0 ≤ i ≤ n-1} and n = sk + r(0 ≤ r ≤ k-1), then f has an R-periodic orbit, where R = s + 1 if s is even, and R = s if s is odd and r = 0, and R = s + 2 if s is odd and r 0. Besides,we also study stability of periodic orbits of continuous multi-valued maps from I to I. 相似文献
982.
Jian Li Zu-Pei Liang Cheng-Yun Wang Xi-Shi Tai 《Journal of chemical crystallography》2009,39(9):638-641
Abstract The title compound N-(2,3,4-trimethoxy-6-methylbenzylidene)-2-methyl-benzenamine (C18H21NO3, M
r = 299.36) was synthesized and characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. The crystal
belongs to monoclinic, space group P21/n, with a = 7.2804(5), b = 8.5909(9), c = 26.117(3) ?, β = 92.056(2)°, V = 1,632.4(3) ?3, Z = 4, D
c = 1.218 g cm−3, λ = 0.71073 ?, μ(Mo Kα) = 0.083 mm−1, F(000) = 640. The final refinement gave R = 0.0497, wR(F
2) = 0.1157 for 2,879 observed reflections with I > 2σ(I). X-ray diffraction analysis reveals that the dihedral angle between the two phenyl rings is 25.9 (2)°. The molecule adopts
a trans configuration about the central C=N functional bond. The crystal structure is stabilized by C–H…O hydrogen bonds and π–π stacking interactions. The title compound possesses moderate antibacterial activity.
Graphical Abstract The title compound N-(2,3,4-trimethoxy-6-methylbenzylidene)-2-methyl-benzenamine (C18H21NO3, M
r = 299.36) was synthesized and characterized by elemental analysis, IR spectra and single crystal X-ray diffraction. The crystal
belongs to monoclinic, space group P21/n, with a = 7.2804(5), b = 8.5909(9), c = 26.117(3) ?, β = 92.056(2)°, V = 1,632.4(3) ?3, Z = 4, D
c = 1.218 g cm−3, λ = 0.71073 ?, μ(Mo Kα) = 0.083 mm−1, F(000) = 640. The final refinement gave R = 0.0497, wR(F
2) = 0.1157 for 2,879 observed reflections with I > 2σ(I). X-ray diffraction analysis reveals that the dihedral angle between the two phenyl rings is 25.9 (2)°. The molecule adopts
a trans configuration about the central C=N functional bond. The crystal structure is stabilized by C–H…O hydrogen bonds and π–π stacking interactions. The title compound possesses moderate antibacterial activity.
相似文献
983.
Introduction Since Tang[1] firstly reported the electroluminescence of 8-hydroxyquinoline aluminium, much attention has been paid to the organic compound as electro-luminescent material. Especially, electron transport materials play an important role in organic light-emitting diode(OLED). 2-(4-Biphenyl)-5-(t-butylphenyl)-1,3,4-oxadiazole(PBD), as a kind of popular electron injection/transport materials, can improve remarkably the injection balance of electrons and holes. As a result, it can amend the properties of OLED[2,3]. 相似文献
984.
Let R be a 2-torsion free prime ring, d1 a nonzero derivation, -γ a generalized derivation associated with a nonzero derivation d2, U a square closed Lie ideal of R. In the present paper,we prove that if [di^2(u), u] ∈ Z(R) or γ acts as a homomorphism (or an antihomomorphism) on U, then U Z(R). 相似文献
985.
986.
Yu‐An Xiong Tai‐Ting Sha Qiang Pan Xian‐Jiang Song Shu‐Rong Miao Zheng‐Yin Jing Zi‐Jie Feng Yu‐Meng You Ren‐Gen Xiong 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(26):8949-8953
The X‐site ion in organic–inorganic hybrid ABX3 perovskites (OHPs) varies from halide ion to bridging linkers like HCOO?, N3?, NO2?, and CN?. However, no nitrite‐based OHP ferroelectrics have been reported so far. Now, based on non‐ferroelectric [(CH3)4N][Ni(NO2)3], through the combined methodologies of quasi‐spherical shape, hydrogen bonding functionality, and H/F substitution, we have successfully synthesized an OHP ferroelectric, [FMeTP][Ni(NO2)3] (FMeTP=N‐fluoromethyl tropine). As an unprecedented nitrite‐based OHP ferroelectric, the well‐designed [FMeTP][Ni(NO2)3] undergoes the ferroelectric phase transition at 400 K with an Aizu notation of 6/mmmFm, showing multiaxial ferroelectric characteristics. This work is a great step towards not only enriching the molecular ferroelectric families but also accelerating the potential practical applications. 相似文献
987.
Deng‐Gao Chen Yi Chen Cheng‐Ham Wu Yi‐An Chen Meng‐Chi Chen Jia‐An Lin Chun‐Ying Huang Jianhua Su He Tian Pi‐Tai Chou 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(38):13431-13435
Phenothiazine derivatives based on the 10‐phenyl‐10H‐phenothiazine ( NAS ) chromophore, namely 7‐phenyl‐7H‐benzo[c]phenothiazine ( NAS‐1 ) and 12‐phenyl‐12H‐benzo[a]phenothiazine ( NAS‐2 ), were designed and synthesized. NAS‐1 and NAS‐2 are constitutional isomers with different steric strains imposed on the phenothiazine core moiety. In solution, the more‐strained NAS‐2 possesses a bent structure and undergoes photoinduced structural planarization (PISP). In the crystal, despite the absence of PISP, bent NAS‐2 exhibits prominent excimer emission as well as emission mechanochromism, which is not observed in the planar‐like NAS and NAS‐1 . This unconventional observation results from the bent core structure facilitating π–π stacking of the peripheral naphthalene moieties. Two‐photon‐coupled depth‐dependent emission shows spectral differences between the surface and kernel of the NAS‐2 crystal, and is believed to be a general phenomenon, at least in part, for materials exhibiting emission mechanochromism. 相似文献
988.
A ring is said to be right (resp., left) regular-duo if every right (resp., left) regular element is regular. The structure of one-sided regular elements is studied in various kinds of rings, especially, upper triangular matrix rings over one-sided Ore domains. We study the structure of (one-sided) regular-duo rings, and the relations between one-sided regular-duo rings and related ring theoretic properties. 相似文献
989.
Gang Xu Li‐Yan Peng Xiao‐Li Li Yu Zhao Lin Tu Qin‐Shi Zhao Han‐Dong Sun Yang Lu Li Mao Qi‐Tai Zheng 《Helvetica chimica acta》2005,88(8):2370-2374
Two new sesquiterpenoids, castanin A (= 4R*,5R*,5aS*,8S*,8aR*,8bR*)‐8‐formyl‐4,5,5a,6,7,8,8a,8b‐octahydro‐5,8b‐dihydroxy‐3,5a,8‐trimethyl‐2‐oxo‐2H‐indeno[4,5‐b]furan‐4‐yl acetate; 1 ) and castanin B (= 1aS*,6R*,6aS*,7aR*,9aR*)‐1a,2,6,6a,7a,8,9,9a‐octahydro‐1a,5,7a‐trimethylbisoxireno[4,5 : 8,9]cyclodeca[1,2‐b]furan‐6‐yl acetate; 2 ) were isolated from the aerial parts of Salvia castanea Diels f. tomentosa, together with two known compounds, oplophanone and 1β,6α‐dihydroxyeudesm‐4(14)‐ene. Their structures were elucidated by spectroscopic analyses and, in the case of 2 , also by X‐ray crystallography. Castanin A ( 1 ) represents a novel sesquiterpenoid, with a contracted ring A, derived from eudesmanolide. A possible biogenetic pathway is proposed. 相似文献
990.
制备了一种分子印迹荧光传感器用于菊酯类农药代谢物间苯氧基苯甲醛(3-PBD)的选择性测定。以3-PBD为模板分子,3-氨丙基三乙氧基硅烷为功能单体,四乙氧基硅烷为交联剂,采用溶胶-凝胶法在Mn掺杂ZnS量子点表面成功合成了荧光分子印迹聚合物。采用红外光谱、X射线衍射及X射线光电子能谱对聚合物进行表征,并对检测条件进行了优化。在最佳条件下,该荧光传感器对3-PBD的响应线性范围为0.3~5μmol/L,检出限为0.267μmol/L。此分子印迹荧光传感器可与农药的酶解过程相结合,用于菊酯类农药的快速检测。对实际样品的测定结果显示,3-PBD的回收率为84.0%~119%,相对标准偏差不超过5.0%。结果表明,该分子印迹荧光传感器可以用于食品中3-PBD的测定。 相似文献