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Multiple Limit Cycles Bifurcation From the Degenerate Singularity for a Class of Three-dimensional Systems

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Acta Mathematicae Applicatae Sinica 2016年第1期32卷 73-80页

作者： Qin-long WANG wen-tao huang Yi-rong LIU School of Science Hezhou UniversityHezhou542800China Mathematics School of Central South University Changsha 410075China

In this paper,bifurcation of small amplitude limit cycles from the degenerate equilibrium of a three-dimensional system is ***,the method to calculate the focal values at nilpotent critical point on center manifold is *** an example is studied,by computing the quasi-Lyapunov constants,the existence of at least 4 limit cycles on the center manifold is *** terms of degenerate singularity in high-dimensional systems,our work is new.

关键词： Quasi-Lyapunov constant degenerate singularity limit cycles bifurcation three-dimensional system

Weak Centers and Local Bifurcations of Critical Periods at Infinity for a Class of Rational Systems

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Acta Mathematicae Applicatae Sinica 2013年第2期29卷 377-390页

作者： wen-tao huang Valery G.ROMANOVSKI WEI-NIAN ZHANG School of Mathematics and Computing Science Guilin University of Electronic Technology Center for Applied Mathematics and Theoretical Physics University of Maribor School of Mathematics Sichuan University

We describe an approach to studying the center problem and local bifurcations of critical periods at infinity for a class of differential systems. We then solve the problem and investigate the bifurcations for a class... 详细信息

关键词： weak center isochronicity bifurcation of critical periods

Single-centre study comparing standard apical dissection with a modified technique to facilitate vesico-urethral anastomosis during laparoscopic radical prostatectomy

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Asian Journal of Andrology 2011年第3期13卷 494-498,515页

作者： Xin Gao Xiao-Yong Pu Jie Si-Tu wen-tao huang Department of Urology the Third Affiliated Hospital Sun Yat-Sen University Guangzhou 510630 China

A modified apical dissection of the prostate to improve the efficiency of vesico-urethral anastomosis （VUA） in laparoscopic radical prostatectomy （LRP） was reported. A total of 42 patients were randomly selected and enrolled in this study. A standard LRP was performed in 21 patients （group 1）, whereas a novel, modified apical dissection of the prostate in LRP was performed in another 21 patients （group 2）. Surgical data, total operative time, VUA time, extravasation rate, catheterisation time, occurrence of anastomotic strictures, and the early and late continence rates were analysed statistically. No differences in clinical or pathological characteristics were determined between the two groups. The total operative time, VUA time, blood loss and catheterisation time were lower in group 2, which received the novel, modified technique compared with group 1, which received the standard technique to dissect the apex of the prostate （P〈0.01 for each variable）. Regarding the extravasation rate and the occurrence of anastomotic strictures, no significant differences were found between the two groups （P〉0.0.05 for each）. After catheter removal, a statistically significant difference in the continence rates was present at 3 and 30 days post operation in the two groups （P〈0.01, respectively）. At 90 days post operation, the difference, although still present, was no longer statistically significant （P〉0.05）. The novel, modified apical dissection of the prostate facilitates the VUA and significantly improves the efficacy of the procedure and early restoration of continence.

关键词： continence laparoscopic technique radical prostatectomy vesico-urethral anastomosis

Cationic engineered nanodiamonds for efficient antibacterial surface with strong wear resistance

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Nano Research 2024年第3期17卷 939-948页

作者： Fu-Kui Li wen-Bo Zhao Yong Wang wen-tao huang Ya-Lun Ku Hang Liu Rui Guo Hui-Hui Yu Kai-Kai Liu Chong-Xin Shan Henan Key Laboratory of Diamond Optoelectronic Materials and Devices Key Laboratory of Materials PhysicsMinistry of Educationand School of Physics&MicroelectronicsZhengzhou UniversityZhengzhou 450052China

The spread of diseases caused by bacterial adhesion and immobilization in public places constitutes a serious threat to public *** of bacteria spread by the construction of an antibacterial surface takes precedence over post-infection ***,we demonstrate an effective antibacterial surface with strong wear resistance by constructing cationic engineered nanodiamonds(C-NDs).The C-NDs with positive surface potentials interact effectively with bacteria through electrostatic interactions,where the C-NDs act on the phospholipid bilayer and lead to bacterial membrane collapse and rupture through hydrogen bonding and residual surface oxygen-containing reactive *** this case,bactericidal rate of 99.99%and bacterial biofilm inhibition rate of more than 80%can be achieved with the C-NDs concentration of 1 mg/*** addition,the C-NDs show outstanding antibacterial stability,retaining over 87%of the antibacterial effect after stimulation by adverse environments of heat,acid,and external ***,an antibacterial surface with high wear resistance obtained by integrating C-NDs with commercial plastics has been *** antibacterial surface with a mass fraction of 1 wt.%C-NDs improved abrasion resistance by 3981 times,with 99%killing of adherent *** work provides an effective strategy for highly efficient antibacterial wear-resistant surface,showing great practical applications in public health environments.

关键词： antibacterial surface cationic engineered nanodiamonds wear-resistant

A strategy to achieve efficient green-emission dual-mode luminescence of Yb^(3+),Er^(3+) doped NaBiF_(4)

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Rare Metals 2021年第8期40卷 2040-2048页

作者： Jin-Hui Xie Jue Wang Gui-Hua Qiu Xi-Bing Li wen-tao huang Rui-Rong Zhang Tong Lin Li-Xi Wang Qi-Tu Zhang College of Materials Science and Engineering Nanjing Tech UniversityNanjing210009China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing210009China Shandong Institute of Non-metallic Material Jinan250031China

A series of hexagonal phase NaBiF_(4):x Yb^(3+),y Er^(3+) were successfully synthesized by solvothermal *** morphology,phase structure,up-conversion luminescence and down-conversion luminescence properties of Yb^(3+) and Er^(3+) doping concentration and the energy transfer mechanism were *** shows that the doping of Yb^(3+) and Er^(3+) does not cause the phase transition of NaBiF_(4),but influences its *** the NaBiF_(4):Yb^(3+),Er^(3+),Yb^(3+) can transfer energy with Er^(3+),enhancing up-conversion green *** Yb^(3+) doping concentration increasing,the up-conversion red-green ratio will increase while the down-conversion intensity of the green emission decreases and that of the red emission *** the potential application of Na BiF4:x Yb^(3+),y Er^(3+) phosphors in optical illumination,the thermal stability was carried out.

关键词： NaBiF_(4) Dual-mode luminescence Energy transfer High temperature fluorescence

Synthesis and luminescence of ultrasmall CsPbBr_(3) nanocrystals and CsPbBr_(3)/Cs_(4)PbBr_(6) composites by one-pot method

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Rare Metals 2022年第4期41卷 1230-1238页

作者： Xi-Bing Li wen-tao huang Rui-Rong Zhang Yue Guo Hui-Jie Yang Xiao-Yue He Ming-Xun Yu Li-Xi Wang Qi-Tu Zhang College of Materials Science and Engineering Nanjing Tech UniversityNanjing 210009China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing 210009China Institute of Non-Metallic Materials Ji'nan 250031China College of 2011 Nanjing Tech UniversityNanjing 210009China

All-inorganic perovskites CsPbX_(3)(X=Cl,Br,I)have attracted worldwide interest due to their excellent lumi-nescent ***,Cs_(4)PbBr_(6) have been studied because they can enhance the luminescent efficiency and stability of CsPbBr_(3).Herein,we introduced a microfluidic method based on room-temperature supersat-urated recrystallization to synthesize blue-emitting CsPbBr_(3)nanocrystals(NCs)and green-emitting CsPbBr_(3)/Cs_(4)PbBr_(6)*** ultrasmall CsPbBr_(3)NCs emitted at a deep blue wavelength of 461 nm with the full width at half maximum(FWHM)of 15 *** electron microscopy(TEM)results demonstrated that ultrasmall CsPbBr_(3)NCs with the average particle size of 3.8 nm were synthesized and the CsPbBr_(3)NCs were crystallized as monoclinic structure.

关键词： composites (3) method

Role of calcimicrobes and microbial carbonates in the Late Carboniferous(Moscovian) mounds in southern Guizhou,South China

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Journal of Palaeogeography 2019年第4期8卷 346-359页

作者： wen-tao huang Yong-Li Zhang Chang-Qing Guan Zhuo-Wei Miao Xiao-Hong Chen Zhen-Yuan Yang Xiao Li En-Pu Gong College of Resources and Civil Engineering Northeastern UniversityShenyang 110819Liaoning ProvineeChina College of Resources and Materials Northeastern University at QinhuangdaoQinhuangdao 066004Hebei ProvineeChina

Various microbial fabrics characterize late Moscovian mounds in Houchang Town,southern Guizhou,South *** dominant components of the mounds are microbial boundstones with stromatolitic structures,irregular oncoid-like forms,and wrinkle *** recognized in the mounds include Girvanella,Ortonella,Wetheredella-like,Palaeomicrocodium-like,and some problematic calcimicrobes occurring in deposits between microbial boundstones,in thrombolitic textures,and in some *** carbonates are common in the substrate and interior of the mounds,including thrombolitic textures,microstromatolites,microbial ooids,oncoids,irregular encrusted layers,microbial mat debris,and microbial *** and microbial carbonates played an important role in the construction of the mounds:Girvanella might have contributed as a source of lime mud that formed the mound and stabilized the coral frame;thrombolitic mats could trap and fix sediments and bioclasts,contributing to the stabilization of substrate and mound limestones;and,microbial boundstone,clotted micrite and micritized bioclast could provide a hard substrate for encrusting metazoans(e.g.,bryozoans,Ivanovia).The abundant microbial fabrics in the mounds indicate that microbial activity was widespread in Moscovian reef mounds in southern Guizhou,and this suggests that microbial organisms were the primary mound builders in the study area.

关键词： Microfossils Microbial carbonates Mounds Late Carboniferous Moscovian Guizhou

^(68)Ga-PSMA ligand PET/CT integrating indocyanine green-guided salvage lymph node dissection for lymph node metastasis after radical prostatectomy

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Asian Journal of Andrology 2022年第1期24卷 97-101页

作者： Teng-Cheng Li Yu Wang Chu-Tian Xiao Ming-Zhao Li Xiao-Peng Liu wen-tao huang Liao-Yuan Li Ke Li Jin-Ming Di Xing-Qiao wen Xin Gao Department of Urology The Third Affiliated HospitalSun Yat-sen UniversityGuangzhou 510630China

To efficiently remove all recurrent lymph nodes(rLNs)and minimize complications,we developed a combination approach that consisted of ^(68)Gallium prostate-specific membrane antigen(PSMA)ligand positron emission tomography(PET)/computed tomography(CT)and integrated indocyanine green(ICG)-guided salvage lymph node dissection(sLND)for rLNs after radical prostatectomy(RP).Nineteen patients were enrolled to receive such treatment.^(68)Ga-PSMA ligand PET/CT was used to identify rLNs,and 5 mg of ICG was injected into the space between the rectum and bladder before *** laparoscopy was used to perform *** extensive LN dissection was performed at level I,another 5 mg of ICG was injected via the intravenous route to intensify the fluorescent signal,and laparoscopy was introduced to intensively target stained LNs along levels I and II,specifically around suspicious LNs,with ^(68)Ga-PSMA ligand PET/***,both lateral peritonea were exposed longitudinally to facilitate the removal of fluorescently stained LNs at levels III and *** total,pathological analysis confirmed that 42 nodes were *** 145 positive LNs stained with ICG,24 suspicious LNs identified with ^(68)Ga-PSMA ligand PET/CT were *** sensitivity and specificity of ^(68)Ga-PSMA ligand PET/CT for detecting rLNs were 42.9%and 96.6%,*** ICG,the sensitivity was 92.8%and the specificity was 39.1%.At a median follow-up of 15(interquartile range[IQR]:6–31)months,15 patients experienced complete biochemical remission(BR,prostate-specific antigen[PSA]0.2 ng ml−***,^(68)Ga-PSMA ligand PET/CT integrating ICG-guided sLND provides efficient sLND with few complications for patients with rLNs after RP.

关键词： indocyanine green prostate cancer recurrent lymph node salvage lymph node dissection

Synthesis and crystal structures of bis(cyclopentyl)gallium phenoxide dimer and bis (cyclopentyl) gallium naphthoxide dimer

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Chinese Journal of Chemistry 1994年第6期12卷 542-548页

作者： HAN, Ying tao, wen-Tian huang, Yao-Zeng JIN, Xiang-Lin SUN, JieLaboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Tricyclopentylgallium reacted with phenol, naphthol respectively to yield phenox-ide (or naphthoxide) of biscyclopentylgallium which have been characterized by elemental analysis, IR, 1H NMR and mass spectrometry. X-ray diffraction analysis of compound 1 indicated that it belongs to the monoclinic system, space groups P21/c, with cell constants 0=9.602(3), 6=14.365(7), c=11.256(4)A, and β=97.54(3)°, Z=2(dimers), R=0.0706. Compound 2 assigned to the triclinic system, space groups P1 with cell constants a=9.392(4), 6=9.928(7), c=11.263(7) A, a=112.48(5), β=104.74(4), γ=99.95(5)°, and Z=l(dimers), R=0.0526. The molecule of 1 or 2 contains an oxygen-bridged coplanar Ga2O2 four-membered ring respectively.

关键词： Crystal structure bis(cyclopentyl)gallium aryloxide dimer.