检索结果-南通市图书馆

Pd-Catalyzed Intermolecular Dearomative Heck Reaction of Indole Derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2020年第5期38卷 525-526页

作者： ping yang State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular SynthesisShanghai Institute of Organic ChemistryChinese Academy of Sciences345 Lingling LuShanghai 200032China

Dearomatization of indole derivatives[1,2]provides a straightforward approach for synthesizing diverse indolines which serve as the structural core of numerous natural products and pharmaceuticals.[3]Over the past decade,Pd-catalyzed Heck reaction[4]has been applied in the dearomatization of *** this regard,several elegant intramolecular dearomative Heck reactions of indoles have been developed.[s]However,to date,the reported works are mainly limited to intramolecular reactions,which proceed viaβ3-hydride elimination or trapping by an additional nucleophile(Scheme 1(a)).However,additional synthetic elaboration is usually required to access appropriate substrates for the key dearomatization step,thus reducing the synthetic efficiency.

关键词： intramolecular Heck straight

Advances in noble metal-modified g-C_(3)N_(4) heterostructures toward enhanced photocatalytic redox ability

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2368-2389页

作者： Xiao Zhang ping yang Faculty of Chemical Engineering and Technology Cracow University of TechnologyKrakow 31-155Poland School of Material Science&Engineering University of JinanJinan 250022China

The photocatalytic activity of catalysts depends on the energy-harvesting ability and the separation or transport of photogenerated *** light absorption capacity of graphitic carbon nitride(g-C_(3)N_(4))-based composites can be enhanced by adjusting the surface plasmon resonance(SPR)of noble metal nanoparticles(e.g.,Cu,Au,and Pd)in the entire visible *** can be carried out by varying the nanocomponents of the *** SPR of noble metals can enhance the local electromagnetic field and improve interband transition,and resonant energy transfer occurs from plasmonic dipoles to electron-hole pairs via near-field electromagnetic ***,noble metals have emerged as relevant nanocomponents for g-C_(3)N_(4) used in CO_(2) photoreduction and water ***,recent key advances in noble metals(either in single atom,cluster,or nanoparticle forms)and composite photocatalysts based on inorganic or organic nanocomponent-incorporated g-C_(3)N_(4) nanosheets are systematically discussed,including the applications of these photocatalysts,which exhibit improved photoinduced charge mobility in CO_(2) photoconversion and H2 *** related to the different types of multi-nanocomponent heterostructures(involving Schottky junctions,Z-/S-scheme heterostructures,noble metals,and additional semiconductor nanocomponents)and the adjustment of dimensionality of heterostructures(by incorporating noble metal nanoplates on g-C_(3)N_(4) forming 2D/2D heterostructures)are *** current prospects and possible challenges of g-C_(3)N_(4) composite photocatalysts incorporated with noble metals(e.g.,Au,Pt,Pd,and Cu),particularly in water splitting,CO_(2) reduction,pollution degradation,and chemical conversion applications,are summarized.

关键词： g-C_(3)N_(4) heterostructure noble metal photocatalysis H_(2)generation CO_(2)

Antifungal Evaluation of Copper(Ⅱ) Complex from a Schiff Base Derivative of Pyrazine on Schizosaccharomyces pombe

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第1期38卷 95-102,4页

作者： yang ping School of Environment Jinan University

A new copper(Ⅱ) complex of CuLCl_2, where L = N^1-(1-pyrazin-2-yl-ethylidene)-ethane-1,2-diamine, a tridentate Schiff base derived from 2-acetylpyrazine has been prepared. The complex has been characterized by FT-IR, elemental analysis and single-crystal X-ray diffraction studies. Structural studies reveal that CuLCl_2 is a mononuclear copper(Ⅱ) complex with distorted square pyramidal geometry. Antifungal activity of CuLCl_2 was investigated by use of microcalorimetric measurement system and evaluated against S. pombe. It has high antifungal activity with IC_(50) = 213 μg/mL.

关键词： antifungal agents copper Schiff bases pyrazine S.pombe

Variable stars in the open cluster NGC 2141

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2015年第5期15卷 733-741页

作者： yang-ping Luo School of Physics & Electronic Information China West Normal University Key Laboratory for the Structure and Evolution of Celestial Objects Chinese Academy of Sciences

We report the results of a search for variable stars in the open cluster NGC 2141. Ten variable stars are detected, among which nine are new variable stars and they are classified as three short-period W UMa-type eclipsing binaries, two EA- type eclipsing binaries, one EB-type eclipsing binary, one very short-period RS CVn- type eclipsing binary, one d-type RR Lyrae variable star, and one unknown type of variable star. The membership and physical properties are discussed, based on their light curves, positions in the color magnitude diagrams, spatial locations and periods. A known EB-type eclipsing binary is also identified as a blue straggler candidate in the cluster. Furthermore, we find that all eclipsing contact binaries have prominent asymmetric eclipses and display the O＇Connell effect, which increases with a decrease in orbital periods. This suggests that the O＇Connell effect is probably related to the evolution of the orbital period in short period eclipsing binary systems.

关键词： stars binaries general -- open clusters and associations individual (NGC 2141) -- variables general

Inhomogeneous Distribution of Second Phase Particles in Grain Oriented Electrical Steels

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2011年第12期27卷 1120-1124页

作者： yang Li Weimin Mao ping yang Department of Materials University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing100083 China

The second phase particles were observed during the whole manufacturing process of conventional grain oriented electrical steels, exhibiting that the areal density of particles in the center was obviously higher than that on the surface at each manufacturing stage. After hot rolling, the approximately equiaxed grains formed upon recrystallization were present on the sheet surface while the deformation structures were retained in the central part. Thus, the dislocation density on the surface was evidently lower than that in the center and this trend became more noticeable after the first cold rolling. Since new precipitates were mainly nucleated at dislocations during both hot rolling and annealing following cold deformation, the difference in dislocation density resulted in the inhomogeneous distribution of particles through the thickness of sheet. According to this, Goss grains, which were usually found near the surface, tended to grow up more easily during the secondary recrystallization treatment.

关键词： Grain oriented electrical steel Precipitation Recrystallization Dislocation

The Change of Orientation Relationships Between Austenite and α'-Martensite During Deformation in High Manganese TRIP Steel

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第3期28卷 289-294页

作者： Hai-Yan yang Jing Li ping yang School of Materials Science and Engineering University of Science and Technology Beijing

In situ observation of electron backscattering diffraction technique was used to evaluate the orientation relationships between austenite and α′-martensite（α′-M） for high manganese transformation-induced plasticity *** was noted that different from the thermal martensite,which well obeyed K-S relationship with austenite,the orientation relationship between deformation-induced α′-M with austenite changed during deformation,namely K-S and N-W relations *** clear differences existed between α′-M variants with two kinds of relationships in terms of martensitic orientation,shape and the misorientation between α′-M *** this phenomenon happened in almost all austenitic grains with different orientations investigated in this *** atom displacement mechanism through conjugate complex slips of partial dislocations in the distorted fcc lattice was applied in this article to interpret the coexistence of K-S and N-W relationships.

关键词： In situ observation Orientation relationship Electron backscattered diffraction technique(EBSD) Martensitic transformation High manganese TRIP steel

Using sequential analysis procedures to rank the influencing factors of public work’s quality

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第3期7卷 330-334页

作者： yang Chau-ping Department of Civil Engineering and Engineering Informatics Chung-Hua University Hsin Chu Taiwan 30067 China

In order to improve the efficiency in management of public work projects, screening and controlling influencing factors affecting the quality of a public work project is essential. This study synthesized 9 influential categories including 91 factors related to quality management of public works in Taiwan using a sequential analysis procedure. According to the Borda-values of influencing factors obtained from a first stage questionnaire, the number of primary factors selected by the re-sponsible entities and the design-supervisory entities were 44 and 45 respectively. A Fuzzy Analytic Hierarchy Process (FAHP) was used to prioritize and rank these factors. The top five factors ranked by the responsible entities were (1) introduction of the earned value analysis, (2) working efficiency, (3) environmental laws and regulations, (4) price-index fluctuation, and (5) on-site safety management. The top five factors ranked by the design-supervisory entities were (1) man power, (2) laws and regulations, (3) price-index fluctuation, (4) traffic conditions, and (5) faulty design.

关键词： FAHP Public works Quality management Influencing factors

Effect of Initial Goss Texture Sharpness on Texture Evolution and Magnetic Properties of Ultra-thin Grain-oriented Electrical Steel

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 895-906页

作者： Rui-yang Liang ping yang Wei-Min Mao School of Materials Science and Engineering University ofScience and Technology BeijingBeijing 100083China

In this study, high- and low-grade grain-oriented electrical steels were used as the initial materials to produce 0.08-mm-thick sheet with one-step cold-rolling method. Electron backscattering diffraction analysis technique and X-ray diffraction texture analysis technique were adopted to investigate the effect of initial Goss texture sharpness on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The results showed that primary recrystal- lization and secondary recrystallization were the main processes that occurred during annealing. The induced factors for secondary recrystallization of two grades samples were not Consistent. The high-grade samples presented texture induction mechanism, while the low-grade samples revealed strong surface-energy induction mechanism. The initial Goss texture sharpness had a great impact on texture evolution and magnetic properties of ultra-thin grain-oriented electrical steel. The Goss texture component formed after primary recrystallization was stronger, and better magnetic properties were obtained at low frequencies. For low-grade samples, secondary recrystallization enhanced the intensity of Goss texture, and both grain size and texture contributed to better high-frequency magnetic properties after secondary recrystallization. By controlling the annealing process, the magnetic properties of low-grade products could be significantly improved, thus achieving conversion from low-grade to high-grade products.

关键词： Ultra-thin grain-oriented electrical steel Goss texture Secondary recrystallization Magnetic properties

Transferring quantum entangled states between multiple single-photon-state qubits and coherent-state qubits in circuit QED

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2021年第6期16卷 99-108页

作者： Qi-ping Su Hanyu Zhang Chui-ping yang Department of Physics Hangzhou Normal UniversityHangzhou 311121China Quantum Information Research Center Shangrao Normal UniversityShangrao 334001China

We present a way to transfer maximally-or partially-entangled states of n single-photon-state(SPS)qubits onto ncoherent-state(CS)qubits,by employing 2nmicrowave cavities coupled to a superconducting flux *** two logic states of a SPS qubit here are represented by the vacuum state and the single-photon state of a cavity,while the two logic states of a CS qubit are encoded with two coherent states of a *** of using only one superconducting qutrit as the coupler,the circuit architecture is significantly *** operation time for the state transfer does not increase with the increasing of the number of *** the dissipation of the system is negligible,the quantum state can be transferred in a deterministic way since no measurement is ***,the higher-energy intermediate level of the coupler qutrit is not excited during the entire operation and thus decoherence from the qutrit is greatly *** a specific example,we numerically demonstrate that the high-fidelity transfer of a Bell state of two SPS qubits onto two CS qubits is achievable within the present-day circuit QED ***,it is worthy to note that when the dissipation is negligible,entangled states of n CS qubits can be transferred back onto n SPS qubits by performing reverse *** proposal is quite general and can be extended to accomplish the same task,by employing a natural or artificial atom to couple 2nmicrowave or optical cavities.

关键词： entangled state single-photon-state qubit coherent-state qubit circuit QED