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Rare Metals 2015年第6期34卷 395-399页

作者： Sheng-Chu li Shui-Jiang Hu Ning Du Jia-Neng Fan li-jun xu jun xu Shaoxing Test Institute of Quality and Technical Supervision State Key Laboratory of Silicon Materials and Department of Materials Science and Engineering Zhejiang University

A novel and simple chemical reaction method was developed to synthesize dendrite-like La（OH）3 nanostructures which was composed of centripetal arranged La（OH）3 nanorods with diameters of 50-100 nm and lengths of several micrometers. The effect of different alkaline sources on the morphology of La（OH）3 nanostructures was investigated. It is indicated that diethyl- enetriamine acts not only as an alkaline source, but also as a surfactant which induces the centripetal growth of La（OH）3 nanostructures. Moreover, dendrite-like La203 nanostructures were prepared by the calcination of La（OH）3 nanostructures at 750 ℃. The morphology, structure, and composition of the as-synthesized products were characterized by transmission electron microscopy （SEM）, high-resolution transmission electron microscopy, field emission scanning electron microscopy （FESEM）, and X-ray powder diffraction （XRD）.

关键词： Crystal growth Nanomaterials Kinetics

Palladium-catalyzed highly regioselective Heck reaction of aryl nonaflates with electron-rich olefins

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Chinese Chemical Letters 2008年第9期19卷 1017-1020页

作者： Dan xu Zhi Hua liu Wei jun Tang jun Mo li Jin xu Department of Chemistry Renmin University of China Beijing 100872 China

Highly efficient palladium-catalyzed Heck coupling of aryl nonaflates with electron-rich vinyl ethers, and enamides is described. These reactions afforded exclusively the branched products in good yields. The results ... 详细信息

关键词： Aryl nonaflates Electron-rich Palladium Heck reaction Regioselectivity

Facile synthesis of Zn（Ⅱ）-doped g-C3N4 and their enhanced photocatalytic activity under visible light irradiation

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Rare Metals 2019年第5期38卷 459-467页

作者： Zhao-Tian Wang jun-li xu Hui Zhou Xia Zhang College of Science Northeastern University

Zn(Ⅱ)-doped graphitic carbon nitride(g-C3N4)with high photodegradation activity was prepared by one facile *** morphology and structure of the prepared Zn(Ⅱ)-doped g-C3N4 were investigated,and the results showed that Zn(Ⅱ)could self-disperse during the pyrolysis process and Zn–N bond was formed between g-C3N4 and *** dope of Zn(Ⅱ)influenced the structure of *** performance of photocatalytic activity of Zn(Ⅱ)-doped g-C3 N4 series indicated that the doped g-C3N4 with a small quantity of Zn(0.10 wt%)exhibits the best photocatalytic *** photodegradation activity for methyl orange was 2 times higher than that of pure ***,the photocatalytic activity decreased with the further increased content of Zn,which may be attributed to the structure change of g-C3N4 and the interaction of Zn–N bond between Zn and ***,Zn(Ⅱ)-doped g-C3N4 showed good recycling photocatalytic stability.

关键词： Zn(Ⅱ)dope g-C3N4 Visible light irradiation Photodegradation Photocatalytic stability

Visible light response ZnO-C_(3)N_(4) thin film photocatalyst

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Rare Metals 2021年第1期40卷 96-104页

作者： Yue Zhang Shu-Man Zhao Qi-Wen Su jun-li xu School of Science Northeastern University.Shenyang 110004China

Nanoflower-like ZnO-C_(3)N_(4) thin film with a porous net structure was successfully synthesized by a simple chemical corrosion *** prepared ZnOC_(3)N_(4) thin films presented remarkable photocatalytic activities for the degradation of methyl orange under visible light irradiation,and more than 90%methyl orange was removed from water by ZnO-C_(3)N_(4) ***,the ZnO-C_(3)N_(4) composite presented an enhanced photocatalytic *** loading content of C_(3)N_(4) had a great effect on the photocatalytic ***,the photocatalytic activities were higher in acidic media than those in alkaline *** adsorption of methyl orange was enhanced,and the recombination of photogenerated electrons and holes was suppressed with a suitable content of C_(3)N_(4).However,too much loading content of C_(3)N_(4) resulted in a poor dispersion of C_(3)N_(4) as the aggregated C_(3)N_(4) can behave as recombination *** addition,the prepared ZnO-C_(3)N_(4) thin film can be used for the water splitting in water-methanol system under simulated solar light irradiation.

关键词： ZnO-C_(3)N_(4)thin film Photodegradation Water splitting Visible light irradiation Photocatalytic stability

Toll of Mental Disorders: TLR-Mediated Function of the Innate Immune System

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Neuroscience Bulletin 2019年第4期35卷 771-774页

作者： Jian-Feng liu Ruyan Wu jun-xu li Department of Pharmacology and Toxicology University at Buffalo Buffalo NY 14214 USA School of Medicine Yangzhou University Yangzhou 225000 China

Mental disorder is defined as a syndrome characterized by clinically significant disturbance in an individual’s cognition, emotion, or behavior that reflects a dysfunction in the psychological, biological, or develop... 详细信息

关键词： Mental Disorders TLR-Mediated Function Innate Immune System

Macular and peripapillary retinal nerve fiber layer thickness in children with hyperopic anisometropic amblyopia

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International Journal of Ophthalmology(English edition) 2013年第1期6卷 85-89页

作者： Shuang-Qing Wu li-Wei Zhu Qi-Bin xu jun-li xu Yu Zhang Department of Ophthalmology Hangzhou Red Cross Hospital

AIM:To compare the retinal nerve fiber layer (RNFL) thickness and macular thickness in the amblyopic eye with that in the sound eye of children with hyperopic anisometropic amblyopia using optical coherence tomography (OCT). METHODS:A prospective, nonrandom, intraindividual comparative cohort study includes 72 children with hyperopic anisometropic amblyopia in a single center. Macular thickness, macular foveola thickness, and peripapillary RNFL thickness were compared between the amblyopia eyes and the contralateral sound eyes. ·RESULTS:There were 38 male and 34 female patients, with a mean age as 9.7 ±1.9 years (range, 5-16 years). Hyperopic was +3.62±1.16D (range +2.00D to +6.50D) in the amblyopic eyes, which was significantly higher in the control eyes with +0.76±0.90D (range 0D to +2.00D) (P < 0.01). The mean peripapillary RNFL thickness was 113.9± 7.2μm and 109.2 ±6.9μm in the amblyopic eye and the normal eye, respectively, reaching statistical significance (P = 0.02). The mean macular foveola thickness was significantly thicker in the amblyopic eyes than the contralateral sound eyes (181.4±14.2μm vs 175.2±13.3μm, P <0.01), but the 1mm, 3mm or 6mm macular thickness central macular thickness was not significantly different. Degree of anisometropia in the contralateral eyes was not significantly correlated with differences of peripapillary RNFL, macular foveola thickness or central macular thickness. CONCLUSION:Eyes with hyperopic anisometropic amblyopia are found thicker macular foveola and peripapillary RNFL than the contralateral eyes in children.

关键词： hyperopic anisometropic amblyopia retinal nerve fiber thickness macular thickness optical coherence tomography children

Artificial neural network algorithm for pulse shape discrimination in 2πα and 2πβ particle surface emission rate measurements

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Nuclear Science and Techniques 2023年第10期34卷 91-102页

作者： Yuan-Qiao li Bao-Ji Zhu Yang Lv Heng Zhu Min lin Ke-Sheng Chen li-jun xu China Institute of Atomic Energy Beijing 102413China National Key Laboratory for Metrology and Calibration Techniques Beijing 102413China

To enhance the accuracy of 2πα and 2πβ particle surface emission rate measurements and address the identification issues of nuclides in conventional methods, this study introduces two artificial neural network(ANN) algorithms: back-propagation(BP) and genetic algorithm-based back-propagation(GA-BP). These algorithms classify pulse signals from distinct α and β particles. Their discrimination efficacy is assessed by simulating standard pulse signals and those produced by contaminated sources, mixing α and β particles within the detector. This study initially showcases energy spectrum measurement outcomes, subsequently tests the ANNs on the measurement and validation datasets, and contrasts the pulse shape discrimination efficacy of both algorithms. Experimental findings reveal that the proportional counter's energy resolution is not ideal, thus rendering energy analysis insufficient for distinguishing between 2πα and 2πβ particles. The BP neural network realizes approximately 99% accuracy for 2πα particles and approximately 95% for 2πβ particles, thus surpassing the GA-BP's performance. Additionally, the results suggest enhancing β particle discrimination accuracy by increasing the digital acquisition card's threshold lower limit. This study offers an advanced solution for the 2πα and 2πβ surface emission rate measurement method, presenting superior adaptability and scalability over conventional techniques.

关键词： Pulse shape discrimination Artificial neural networks Alpha and beta sources Multi-wire proportional counter Surface emission rate

Synthesis and Crystal Structure of a One-dimensional Infinite Chain Organotin Complex [(n-Bu)_3Sn(OCOC_5H_4NO)]_n

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Chinese Journal of Structural Chemistry 2005年第11期24卷 1324-1327页

作者： YIN Han-Dong GAO Zhong-jun li Gang xu Hao-Long HONG Min Department of Chemistry Liaocheng University Liaocheng 252059 China

A novel organotin complex [（n-Bu）3Sn（OCOC5H4NO）]n has been synthesized and characterized by elemental analysis, IR and ^1H NMR. The crystal structure has been determined by X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P2 1/c with a = 8.982（2）, b = 17.908（4）, c = 13.219（3） A, β= 96.981（4）°, Z = 4, V= 2110.6（8） A^3, Dc = 1.347 g/cm^3, μ（MoKa） = 12.23 cm^-1, F（000） = 880, R = 0.0497 and wR = 0.1263. In the molecular structure of the title complex, the tin atoms are five-coordinated in a distorted trigonal bipyramidal geometry. A one-dimensional linear polymer is formed through an interaction between the O atoms of pyridine-3-carboxylic acid N-oxide and tin atoms of an adjacent molecule.

关键词： organotin complex pyridine-3-carboxylic acid N-oxide synthesis crystal structure

Spectral-domain optical coherence tomography finding in cytomegalovirus retinitis in AIDS patients

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International Journal of Ophthalmology(English edition) 2020年第11期13卷 1800-1807页

作者： Yan Sheng Yong-Zheng Guo li-jun xu Biao Zhu Department of Ophthalmology the First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Department of Infectious Disease the First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina

AIM:To observe the findings of spectral domain optical coherence tomography(SD-OCT)scan in cytomegalovirus retinitis(CMVR).METHODS:Forty-six eyes of 33 patients with acquired immunodeficiency syndrome and CMVR were enrolled in the *** ophthalmologic examinations,color fundus photography,SD-OCT and fundus autofluorescence(FAF)were performed for all patients at the first visit and each follow-up *** necrosis in CMVR was analyzed on SD-OCT and classified into two types,the typical type and the atypical ***:Forty-one eyes of active CMVR and 4 eyes of recurrent CMVR were classified into typical type,and 4 eyes with graying retinal lesion without hemorrhage or only punctate hemorrhage were classified into atypical *** active stage of CMVR,the retina in typical type was significant thickened with hyperreflective lesion and fullthickness disruption of retinal architecture with enlarged vessel;while in atypical type,the retina was also destroyed in all layers but without thickening or slightly *** choroid,vitreous and retinal vessels were not significantly *** healed stage,the retina was thin with destroyed layers in both *** typical type,FAF showed mottled hypofluorescence mixed with punctuate *** atypical type,the retina showed some"cavity"in outer nuclear layer,and FAF showed mild ***:SD-OCT show different changes in the retina in typical type and atypical type of CMVR,which should be useful in assisting diagnosis and follow-up management of the disease.

关键词： cytomegalovirus retinitis optical coherence tomography fundus autofluorescence

Monte Carlo method for evaluation of surface emission rate measurement uncertainty

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Nuclear Science and Techniques 2024年第7期35卷 126-136页

作者： Yuan-Qiao li Min lin li-jun xu Rui Luo Yu-He Zhang Qian-Xi Ni Yun-Tao liu China Institute of Atomic Energy Beijing102413China National Key Laboratory for Metrology and Calibration Techniques Beijing102413China Department of Radiation Oncology Hunan Cancer HospitalChangsha410031China The Affiliated Cancer Hospital of Xiangya School of Medicine Central South UniversityChangsha410031China

The aim of this study is to evaluate the uncertainty of 2πα and 2πβ surface emission rates using the windowless multiwire proportional counter *** study used the Monte Carlo method (MCM) to validate the conventional Guide to the Expression of Uncertainty in Measurement (GUM) method.A dead time measurement model for the two-source method was established based on the characteristics of a single-channel measurement system,and the voltage threshold correction factor measurement function was indirectly obtained by fitting the threshold correction *** uncertainty in the surface emission rate was calculated using the GUM method and the law of propagation of *** MCM provided clear definitions for each input quantity and its uncertainty distribution,and the simulation training was realized with a complete and complex mathematical *** results of the surface emission rate uncertainty evaluation for four radioactive plane sources using both methods showed the uncertainty’s consistency E_(n)lidation tool for GUM results.

关键词： Surface emission rate Monte Carlo method Metrology Probability distribution function Dead time Low-energy loss correction Least-squares method