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Local Structure Analysis of Lead Zinc Niobate-Barium Titanate Ceramic by X-Ray Absorption Spectroscopy and Density Functional Calculation 认领 引用
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作者 Kanokwan Kanchiang Phakkhananan Pakawanit Rattikorn Yimnirun 《Chinese Physics Letters》 SCIE EI CAS CSCD 2017年第8期113-116,共4页
The local structure of an alternative Pb（Zn1/3Nb2/3）O3-based perovskite ceramic is investigated. The 0.07BaTiO33-0.93Pb（Zn1/3Nb2/3）O3 ceramic is synthesized using a combination of Zn3Nb2O8 B-site precursor and BaT... The local structure of an alternative Pb（Zn1/3Nb2/3）O3-based perovskite ceramic is investigated. The 0.07BaTiO33-0.93Pb（Zn1/3Nb2/3）O3 ceramic is synthesized using a combination of Zn3Nb2O8 B-site precursor and BaTiO33 perovskite phase stabilizer. Then, x-ray absorption spectroscopy and density functional theory are employed to calculate the local structure configuration and formation energy of the prepared samples. Ba2＋ is found to replace Pb2＋ in AA-site with Zn2＋ occupying BB-site in Pb（Zn1/3Nb2/3）O3, while in the neighboring structure, Ti4＋4＋ replaces Nb5＋5＋ in BB-site with Pb2＋2＋ occupying AA-site. With the substitution of BaTiO33 in Pb（Zn1/3Nb2/3）O3, the bond length between Zn2＋ and Pb2＋ is longer than that of the typical perovskite phase of Pb（Zn1/3Nb2/3）O3. This indicates the key role of BaTiO33 in decreasing the steric hindrance of Pb2＋ lone pair, and the mutual interactions between Pb2＋ lone pair and Zn2＋ and the formation energy is seen to decrease. This finding of the formation energy and local structure configuration relationship can further extend a fundamental understanding of the role of BaTiO33 in stabilizing the perovskite phase in PbZn13Nb23O3-based materials, which in turn will lead to an improved preparation technique for desired electrical properties. 展开更多
关键词 Pb Local Structure Analysis of Lead Zinc Niobate-Barium Titanate Ceramic by X-Ray Absorption Spectroscopy and Density Functional Calculation EXAFS Ba XANES Zn
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Relationship between phenotypes of cell-function differentiation and pathobiological behavior of gastric carcinomas 认领 引用 被引量：35
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作者 Yan Xin Xiao Ling Li +4 位作者 Yan Ping Wang Su Min Zhang Hua Chuan Zheng Dong Ying Wu Yin Chang Zhang 《World Journal of Gastroenterology》 SCIE CAS 2001年第1期53-59,共7页
AIM:To reveal the correlation between the functional differentiation phenotypes of gastric carcinoma cells and the invasion and metastasis by a new way of cell-function classification.METHODS:Surgically resected speci... AIM:To reveal the correlation between the functional differentiation phenotypes of gastric carcinoma cells and the invasion and metastasis by a new way of cell-function classification.METHODS:Surgically resected specimens of 361 gastric carcinomas(GC)were investigated with enzyme-,mucin-,and tumor-related marker immunohistochemistry.According to the direction of cell-function differentiation,stomach carcinomas were divided into five functionally differentiated types.RESULTS:(1)Absorptive function differentiation type(AFDT):there were 82(22.7%)patients including 76(92.7%)aged 45 years.Sixty-nine(84.1%)cases belonged to the intestinal type.Thirty-eight(46.3%)expressed CD44v6 and 9(13.6%)of 66 male patients developed liver metastasis.The 5-year survival rate of patients in this group(58.5%)was higher than those with the other types(P【0.01).(2)Mucin secreting function differentiation type(MSFDT):54(15%)cases.Fifty-three(98.1%)tumors had penetrated the serosa,12(22.2%)expressed ER and 22(40.7%)expressed CD44v6.The postoperative 5-year survival rate was 28.6%.(3)Absorptive and mucin-producing function differentiation type(AMPFDT):there were 180(49.9%)cases,including 31(17.2%)aged younger than 45 years.The tumor was more common in women(62,34.4%,)and expressed more frequently estrogen receptors(ER)(129,81.7%)than other types(P【0.01).Ovary metastasis was found in 12(19.4%)out of 62 female subjects.The patients with this type GC had the lowest 5-year survival rate(24.7%)among all types.(4)Specific function differentiation type(SFDT):13(3.6%)cases.Nine(69.2%)tumors of this type derived from APUD system,the other 4(30.7%)were of different histological differentiation.Sixty per cent of the patients survived at least five years.(5)Non-function differentiation type(NFDT):32(8.9%)cases.Nineteen(59.4%)cases had lymph node metastases but no one with liver or ovary metastasis.The 5-year survival rate was 28.1%.CONCLUSION:This new cell-function classification of GC is helpful in indicating the characteristics of invasion and metastasis of GC with different cell-function differentiation phenotypes.Further study is needed to disclose the correlation between the cell-functional differentiation phenotypes and the relevant genotypes and the biological behavior of gastric carcinoma. 展开更多
关键词 stomach neoplasms celldifferentiation lymphatic metastasis _prognosis cell-function classification immunohistochemistry absorptive function differentiation type
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Effect of Conformation on UV-Vis Absorption Spectra of Disazo Reactive Red Dyes 认领 引用
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作者 XIE Xiaomei LI Xiaolei +2 位作者 LUO Hanhan LEI Kelin LI Wei 《Wuhan University Journal of Natural Sciences》 CAS CSCD 2016年第6期512-518,共7页
In this study,twenty disazo reactive red dyes with J acid as coupling components were selected,and their ground state geometry were studied with BLYP functional and TZVP basis set. The UV-vis absorption spectra were c... In this study,twenty disazo reactive red dyes with J acid as coupling components were selected,and their ground state geometry were studied with BLYP functional and TZVP basis set. The UV-vis absorption spectra were calculated by time-dependent density functional theory（TDDFT） employing B3 LYP and PBE0 hybrid functionals and TZVP basis set,and the absolute mean errors are 0.094 e V and 0.133 e V for B3 LYP and PBE0,respectively. From the comparison of the calculated λ_（max） of the three conformations of disazo reactive red dye,cis-,trans-,and azo,with that of experimental one,we find out that conformation plays an important role on UV-Vis absorption. Dyes 6 and 8 exist in azo conformation rather than in cis-conformation. ＂Hole-electron＂ distribution analysis reveals that although these λ_（max） arises from different electron transitions,these electron excitations have the same character of local excitation（LE）. 展开更多
关键词 dye UV-Vis absorption spectrum time-dependent density functional theory（TDDFT）
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ABSORPTIVE FUNCTION OF SEGMENTAL ALLOTRANSPLANTED SMALL INTESTINES IN PIGS 认领 引用 被引量：1
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作者 赵允召 黎介寿 +1 位作者 李宁 廖彩仙 《Chinese Medical Journal》 SCIE CAS 1995年第1期15-19,共5页
Ten outbred pigs were each operated on for three times. First, a 130 cm length of terminal ileum of each pig was isolated on its vascular pedicle as a Thiry-Vella loop. One week later, the solitary ileal segments were... Ten outbred pigs were each operated on for three times. First, a 130 cm length of terminal ileum of each pig was isolated on its vascular pedicle as a Thiry-Vella loop. One week later, the solitary ileal segments were transplanted heterotopically in two pigs. And after 28 days of heterotopic transplantation, the transplanted intestine was interposed into continuity of host intestine as orthotopic transplant. During the experiment, tests were made on 6th day after the first operation (period 1), the 14th (II), 28th (III) day after heterotopic transplantation, and 3 weeks after interposition (IV) respectively for the levels of glucose, palmitate and leucine. Additionally, at period I, III, and IV, a 3 cm length of intestinal mucosa was excised for morphologic observation and determination of DNA, RNA and protein contents. After heterotopic transplantation, the absorptive function of transplanted intestine was severely impaired for two weeks. The absorption of glucose! and palmitate was partially recovered by period III, at which time leucine level had return to normal. At period IV, the absorptive function of glucose and leucine had surpassed normal levels, while palmitate had risen to the level of pretransplantation. After transplantation, at period III, DNA, RNA and protein contents were well below normal. Three weeks after orthotopic transplantation, RNA and protein had risen to normal level, while DNA content remained below normal, The morphologic changes during the experiment were correlated with the changes of contents in RNA, protein and DNA. The area, height, width of villi and the area, depth, width:of crypt were below normal at III and recovered by 3 weeks after orthotopic transplantation (period IV), but were still lower than the levels at pretransplantation. Crypt depths were deeper than those of pretransplantation. 展开更多
关键词 DNA RNA ABSORPTIVE FUNCTION OF SEGMENTAL ALLOTRANSPLANTED SMALL INTESTINES IN PIGS than length IV
Introducing Rich Heterojunction Surfaces to Enhance the High‑Frequency Electromagnetic Attenuation Response of Flexible Fiber‑Based Wearable Absorbers 认领 引用 被引量：9
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作者 He Han Zhichao Lou +2 位作者 Qiuyi Wang Lei Xu Yanjun Li 《Advanced Fiber Materials》 SCIE EI CAS 2024年第3期739-757,共19页
With the rapid development of 5G communication and artificial intelligence(AI)technology,electromagnetic radiation pollution is emerging as a serious issue.Achieving both uniform dispersion and controllable loading of... With the rapid development of 5G communication and artificial intelligence(AI)technology,electromagnetic radiation pollution is emerging as a serious issue.Achieving both uniform dispersion and controllable loading of absorbers and obtaining functional wearable absorbers with high electromagnetic response are still considered great challenges.In this work,a flexible fiber-based absorber(VFT2h/MF/PPy)with a rich interfacial polarization relaxation was obtained by integrating heterostructures and performing nanostructure design and introducingπ-conjugated polymer components.Electrons migrated and redistributed between nanoparticles and nitrogen-carbon lattices with different electrostatic states.The formed heterogeneous interface promoted the electromagnetic attenuation response in the high-frequency region.More specifically,the effective absorption frequency bandwidth was up to 5.6 GHz(corresponds to the Ku-band with a matching thickness range up to 2.55–4.85 mm).Impressively,the abundant modification sites on the fiber surface adjusted the content and dispersion of the magnetic nanoparticles and enhanced the vector superposition effect generated by the structural distribution of the magnetic/electric fields.The introduction of dielectric components improved the interfacial polarization strength of the heterojunction surface and the synergistic effect of the dipolar polarization.The high-efficiency electromagnetic attenuation performance was attributed to multiple loss mechanisms.Our work provides a reference path for the microscopic regulation of the high-efficiency electromagnetic response mechanism of fiber-based flexible absorbing materials. 展开更多
关键词 Functionalized electromagnetic wave absorption Bamboo fiber Interface polarization Thermal management Flexible wearable
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