Search

Your search keyword '"Yang, Zhengyin"' showing total 152 results
Start Over Author "Yang, Zhengyin"
152 results on '"Yang, Zhengyin"'

9. Research on the Vibration Reduction Mechanism of a New Tensioning Platform with an Embedded Superstructure.

Author

Sun, Xiaoqing, Yang, Zhengyin, Wang, Ju, Hou, Xiusong, and Yang, Yikun

Subjects
COMPLIANT platforms, MECHANICAL vibration research, FINITE element method, SMART materials, COMPACT spaces (Topology)
Abstract

Aiming at the problem of precision driving and vibration suppression for sensitive payloads on-orbit, this paper proposes a new compliant platform based on an embedded superstructure and a smart material actuator. Firstly, the main structure of the platform is designed and optimized to achieve the expected indicators via the response surface method. Then, the vibration reduction mechanism of the platform with the embedded superstructure is studied by establishing an equivalent model. Following that, a four-phase superstructure is matched and designed with a compact space, and the results are verified by finite element modal analysis. Finally, both the tensioning performance and vibration reduction performance under fixed frequency harmonic disturbance are studied via transient dynamic simulation. Based on the obtained results, directions for future improvements are proposed. The relevant conclusions can provide a reference for function integration of precision tensioning and vibration suppression. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

20. STUDIES ON SYNTHESIS , CHARACTERIZATION AND ANTITUMOR ACTIVITY OF TERNARY COMLPEXES OF PYRUVIC ACID ISONICOTINOYL HYDRAZONE AND 5-FLUOROURACIL-1-ACETIC ACID WITH RARE EARTHS

Author

Yang Zhengyin, Wang Liufang, Yang Xinping, and Yang Ru-dong

Subjects
Antitumor activity, chemistry.chemical_classification, Molar conductivity, Hydrazone, General Chemistry, chemistry.chemical_compound, Acetic acid, chemistry, Fluorouracil, Proton NMR, medicine, Pyruvic acid, Ternary operation, medicine.drug, Nuclear chemistry
Abstract

Thirteen ternary complexes of pyruvic acid isonicotinoyl hydrazone(H2PPFH) and 5-fluorouracil-1- acetic (HFAA) with rare earths have been synthesized in the paper. The structure and properties of the ternary complexes were determined by elemental analyses, infrared and ultraviolet spectra, molar conductivity and 1H NMR. A general formula of the complexes is RE(PPFH)(FAA)2H2O (RE(III) = La–Yb). Antitumor activity of La(PPFH) (FAA) 2H2O was tested with Leukaemia cells L1210 and transplanted mouse tumor colon cancer C27. The results show that the inhibitory rate for C27 is 41.2%.

Published
2010
Full Text
View/download PDF

26. SYNTHESIS AND ANTICARCINOGENIC ACTIVITY OF 5-FLUOROURACIL-1-ACETIC ACID COMPLEXES WITH RARE EARTHS

Author

He Feng Ying, Peng Zhouren, Wang Qi, Guo Hong-Ying, Cheng Guo-Quan, Wang Liufang, Sun Al-Li, and Yang Zhengyin

Subjects
chemistry.chemical_classification, Stereochemistry, Ligand, Carboxylic acid, Biological activity, Acetic acid, chemistry.chemical_compound, chemistry, Fluorouracil, Toxicity, Materials Chemistry, medicine, Proton NMR, Physical and Theoretical Chemistry, Carcinogen, medicine.drug, Nuclear chemistry
Abstract

Thirteen new solid complexes of 5-fluorouracilacetic acid (FAA) with rare earth metals (RE) have been synthesized. Elemental analysis, IR, UV spectra, TG-DTA, conductance measurements and 1H NMR spectra have been used to characterise them. The general formula of the complexes is Ln (FAA)3·2H2O (Ln = La → Yb, Pm not included). The anticarcinogenic activity of La(FAA)3·2H2O was tested. The results obtained showed that the survival period of mice which had been transplanted with ascites carcinoma (HepA) and then treated with the La complex can be prolonged to 235% of the control but the ligand alone snowed little anticarcinogenic activity. Some 42% of EC cancer cell growth can be inhibited by the La complex. The LD50 is 500 mg kg−1.

Published
1993
Full Text
View/download PDF

31. Manganese(ii) complex of a hydrazone ligand derived from pyruvic acid and 4-pyridine carboxylic acid hydrazide—synthesis and crystal structure

Author

Wu Jigui, Wang Liufang, Yang Zhengyin, Zhu Ying, and Wang Qi

Subjects
chemistry.chemical_classification, Stereochemistry, Carboxylic acid, chemistry.chemical_element, Hydrazone, Crystal structure, Manganese, Hydrazide, law.invention, Inorganic Chemistry, chemistry.chemical_compound, Crystallography, chemistry, law, Pyridine, Materials Chemistry, Physical and Theoretical Chemistry, Crystallization, Monoclinic crystal system
Abstract

A hydrazone ligand (H2PAPH) derived from pyruvic acid and 4-pyridine carboxylic acid hydrazide and its manganese(II) complex have been synthesized and X-ray diffraction analysis of the complex was carried out. The crystal is monoclinic, space group P2(1)/n, with unit-cell dimensions a = 11.252(1), b = 9.828(2), c = 13.708(2) angstrom, beta = 66.03(1)-degrees and V = 1385.2 angstrom-3, Z = 4, D(c) = 2.812 g cm-3, F(000) = 1216, mu(Mo-K-alpha) = 18.506 cm-1. The structure was solved by the heavy-atom technique from 2417 observed, independent reflections recorded at 293 K and refined to a final R = 0.028. The manganese atom has a distorted octahedral coordination with two trans water molecules in axial sites and an NO3 donor set from hydrazone ligands (H2PAPH) in the equatorial plane. The complex has a polymeric structure. The crystal structure also contains 2.5 water molecules of crystallization, which are involved in a hydrogen-bonding network in the crystal packing. The complex has been also characterized by elemental analysis and IR spectra.

Published
1991
Full Text
View/download PDF

41. Interface coassembly of mesoporous MoS2 based-frameworks for enhanced near-infrared light driven photocatalysis.

Author

Zhi, Lihua, Zhang, Haoli, Yang, Zhengyin, Liu, Weisheng, and Wang, Baodui

Subjects
PHOTOCATALYSIS, NEAR infrared radiation, CRYSTAL structure, NITROGEN analysis, TEMPERATURE measurements
Abstract

The three-dimensional porous Fe3O4@Cu2−xS–MoS2 framework is reported for the first time. The as-prepared 3D framework exhibits good structural stability, high surface area, enhanced adsorption capacity to substrates, and strong absorption in the NIR range. As a result, such hybrid frameworks exhibit excellent NIR-light photocatalytic activity and stable cycling for the direct arylation of heteroaromatics at room temperature. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results