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A New Abietane Diterpenoid from the Barks of Taxus yunnanensis

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Chinese Chemical Letters 2001年第5期12卷 429-430页

The structure of a new abietane diterpenoid, taxayunnin (1), from the barks of Taxus yunnanensis, was determined by spectroscopic analysis. A known abietane diterpenoid, taxamairin C (2), was also isolated.

关键词： Taxus yunnanensis Taxaceae abietane diterpenoid Taxayunnin.

Effect of continuous induction annealing on the microstructure and mechanical properties of copper-clad aluminum flat bars

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International Journal of Minerals,Metallurgy and Materials 2016年第12期23卷 1427-1436页

作者： Xin-hua Liu Yan-bin Jiang hong-jie zhang Jian-xin Xie Key Laboratory for Advanced Materials Processing of the Ministry of Education University of Science and Technology Beijing Institute of Advanced Materials and Technology University of Science and Technology Beijing

Copper-clad aluminum （CCA） flat bars produced by the continuous casting-rolling process were subjected to continuous induction heating annealing （CIHA）, and the effects of induction heating temperature and holding time on the microstructure, interface, and mechanical properties of the fiat bars were investigated. The results showed that complete recrystallization of the copper sheath occurred under CIHA at 460℃ for 5 s, 480℃ for 3 s, or 500℃ for 1 s and that the average grain size in the copper sheath was approximately 10.0 μm. In the case of specimens subjected to CIHA at 460-500℃ for longer than 1 s, complete recrystallization occurred in the aluminum core. In the case of CIHA at 460-500℃ for 1-5 s, a continuous interracial layer with a thickness of 2.5-5.5 μm formed and the thickness mainly increased with increasing annealing temperature. After CIHA, the interracial layer consisted primarily of a Cu9A14 layer and a CuA12 layer; the average interface shear strength of the CCA flat bars treated by CIHA at 460-500℃ for 1-5 s was 45-52 MPa. After full softening annealing, the hardness values of the copper sheath and the aluminum core were HV 65 and HV 24, respectively, and the hardness along the cross section of the CCA flat bar was uniform.

关键词： metal cladding copper-clad aluminum annealing interfaces mechanical properties

Neoadjuvant chemoradiotherapy for resectable esophageal carcinoma:A meta-analysis

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World Journal of Gastroenterology 2009年第47期15卷 5983-5991页

作者： Hai-Lin Jin hong Zhu Ting-Sheng Ling hong-jie zhang Rui-Hua Shi Department of Gastroenterology the First Affiliated Hospital of Nanjing Medical University Nanjing 210029 Jiangsu Province China

AIM:To compare neoadjuvant chemoradiotherapy and surgery with surgery alone for resectable esophageal carcinoma. METHODS:We used MEDLINE and EMBASE databases to identify eligible studies and manual searches were done to ensure no studies were *** validity assessment was performed and a trial quality score was assigned. RESULTS:Eleven randomized controlled trials(RCTs) including 1308 patients were *** chemoradiotherapy significantly improved the overall survival compared with surgery *** ratio(OR) [95%confidence interval(CI),P value],expressed as neoadjuvant chemoradiotherapy and surgery vs surgery alone,was 1.28(1.01-1.64,P=0.05)for 1-year survival,1.78(1.20-2.66,P=0.004)for 3-year survival,and 1.46(1.07-1.99,P=0.02)for 5-year *** mortality increased in patients treated by neoadjuvant chemoradiotherapy(OR: 1.68,95%CI:1.03-2.73,P=0.04),but incidence of postoperative complications was similar in two groups (OR:1.14,95%CI:0.88-1.49,P=0.32).Neoadjuvant chemoradiotherapy lowered the local-regional cancer recurrence(OR:0.64,95%CI:0.41-0.99,P=0.04), but incidence of distant cancer recurrence was similar (OR:0.94,95%CI:0.68-1.31,P=0.73).Histological subgroup analysis indicated that esophageal squamous cell carcinoma did not benefit from neoadjuvantchemoradiotherapy,OR(95%CI,P value)was 1.16(0.85-1.57,P=0.34)for 1-year survival,1.34 (0.98-1.82,P=0.07)for 3-year survival and 1.41 (0.98-2.02,P=0.06)for 5-year survival. CONCLUSION:Neoadjuvant chemoradiotherapy can raise the survival rate of patients with esophageal adenocarcinoma.

关键词： Esophageal carcinoma Neoadjuvant chemoradiotherapy Randomized controlled trial Metaanalysis

Multi-objective optimization and experiment of nylon cord rubber in expandable packer

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Petroleum Science 2021年第1期18卷 269-284页

作者： Yan-Wen zhang Han-Xiang Wang Jia-Qi Che Ming-Chao Du hong-jie zhang College of Mechanical and Electronic Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina

Nylon cord rubber has the advantages of small residual deformation and is easy to lift and lower the tubing string in low-permeability oil and gas ***,it is associated with low-pressure resistance and poor sealing *** enhance the performance of nylon cord rubber,a three-dimensional numerical model of the nylon cord rubber was established and its accuracy experimentally *** Plackett-Burman test,the Steepest climbing test and the Response surface method were used to acquire the polynomial response surface model connecting structural parameters with bearing and sealing *** genetic algorithms,optimal structural parameters of nylon cord rubber were determined depending on field *** reliability of the optimized results was verified by laboratory *** was shown that after optimization,the bearing capacity of the expandable packer increased by 25%while the sealing performance increased by 66%.In addition,the bearing pressure was 70 MPa while the sealing pressure was 50 *** measurements effectively met the on-site requirements of high-pressure and fine fracturing in low-permeability oil and gas reservoirs.

关键词： Low-permeability reservoirs Nylon cord rubber Numerical simulation Response surface method Multi-objective genetic algorithm Laboratory test

Simultaneous phosphorus and nitrogen removal in a continuous-flow two-sludge system

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Journal of Environmental Sciences 2006年第1期18卷 52-57页

作者： LI Xiang-kun HUANG Rong-xin BAO Lin-lin SHAO Chun-hong zhang jie School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China

The ability of simultaneous biological phosphorus and nitrogen removal was investigated in a lab-scale continuous-flow two-sludge system. Alternating anaerobic and anoxic conditions were combined with contact oxidation stage for treating raw municipal wastewater. Long-term experiments showed that the contradiction of competing for the organic substrate between denitrifying bacteria and PAOs （phosphorus accumulating organisms） in traditional phosphorus and nitrogen removal system has been resolved. The system can adapt to low influent COD/TN ratio （C/N）. Furthermore the SRT （sludge retention time） of nitrifying sludge and denitrifying phosphorus removal sludge can be controlled at optimal conditions respectively. The removal efficiency of COD, TP, TN, and NH4-N was 81.78%, 92.51%, 75.75%, and 84.47% respectively. It was also found that the appropriate influent C/N should be controlled at the range of 3.8-6, while the optimal C/N to the system ranged between 4-5, and the BFR （bypass sludge flow rate） should be controlled at 0.35 around.

关键词： continue-flow two-sludge system denitrification phosphorus removal nitrification contact oxidation

Fecal microbial dysbiosis in Chinese patients with inflammatory bowel disease

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World Journal of Gastroenterology 2018年第13期24卷 1464-1477页

作者： Hai-Qin Ma Ting-Ting Yu Xiao-Jing Zhao Yi zhang hong-jie zhang Department of Gastroenterology First Affiliated Hospital of Nanjing Medical University

AIM To analyze the alterations of fecal microbiota in Chinese patients with inflammatory bowel disease(IBD).METHODS Fecal samples from 15 patients with Crohn's disease(CD)(11 active CD, 4 inactive CD), 14 patients with active ulcerative colitis(UC) and 13 healthy individuals were collected and subjected to 16 S ribosomal DNA(rDNA) gene sequencing. The V4 hypervariable regions of 16 S rDNA gene were amplified from all samples and sequenced by the Illumina Mi Seq platform. Quality control and operational taxonomic units classification of reads were calculated with QIIME software. Alpha diversity and beta diversity were displayed with R *** Community richness(chao) and microbial structure in both CD and UC were significantly different from those in normal controls. At the phyla level, analysis of the microbial compositions revealed a significantly greater abundance of Proteobacteria in IBD as compared to that in controls. At the genera level, 8 genera in CD and 23 genera in UC(in particular, the Escherichia genus) showed significantly greater abundance as compared to that in normal controls. The relative abundance of Bacteroidetes in the active CD group was markedly lower than that in the inactive CD group. The abundance of Proteobacteria in patients with active CD was nominally higher than that in patients with inactive CD; however, the difference was not statistically significant after correction. Furthermore, the relative abundance of Bacteroidetes showed a negative correlation with the CD activity index *** Our study profiles specific characteristics and microbial dysbiosis in the gut of Chinese patients with IBD. Bacteroidetes may have a negative impact on inflammatory development.

关键词： Crohn’s disease Ulcerative colitis Chinese Microbial dysbiosis 16S ribosomal DNA

Hybrid Luminescent Films Obtained by Covalent Anchoring Terbium Complex to Silica-based Network

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Chinese Chemical Letters 2002年第10期13卷 991-992页

作者： Feng Yi LIU Lian She FU Jun WANG Huan Rong LI hong jie zhang Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022

New monomer N-(4-carboxyphenyl)-NL-(propyltriethoxysilyl)urea (1) which acts as both a ligand for Th3+ ion and a sol-gel precursor has been synthesized and characterized by H-1 NMR, and MS. Hybrid luminescent thin films consisting of organoterbium covalently bonded to a silica-based network have been obtained in situ via a sol-gel approach. Strong line emission of Tb3+ ion was observed from the hybrid luminescent films under UV excitation.

关键词： Hybrid thin film luminescence sol-gel.

Improving Open Set Domain Adaptation Using Image-to-Image Translation and Instance-Weighted Adversarial Learning

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Journal of Computer Science & Technology 2023年第3期38卷 644-658页

作者：张鸿杰李昂过洁郭延文 State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023China Google DeepMind Mountain ViewCA 94043U.S.A.

We propose to address the open set domain adaptation problem by aligning images at both the pixel space and the feature *** approach,called Open Set Translation and Adaptation Network(OSTAN),consists of two main components:translation and *** translation is a cycle-consistent generative adversarial network,which translates any source image to the“style”of a target domain to eliminate domain discrepancy in the pixel *** adaptation is an instance-weighted adversarial network,which projects both(labeled)translated source images and(unlabeled)target images into a domain-invariant feature space to learn a prior probability for each target *** learned probability is applied as a weight to the unknown classifier to facilitate the identification of the unknown *** proposed OSTAN model significantly outperforms the state-of-the-art open set domain adaptation methods on multiple public *** experiments also demonstrate that both the image-to-image translation and the instance-weighting framework can further improve the decision boundaries for both known and unknown classes.

关键词： adversarial learning domain adaptation open set translation

Stability and Hopf Bifurcation of the Maglev System with Delayed Speed Feedback Control

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自动化学报 2007年第8期33卷 829-834页

作者： WANG hong-Po LI jie zhang Kun School of Meehatronics and Automation National University ofDefense Technology Changsha 410073 P. R. China

Abstract The problem of time delay speed feedback in the control loop is considered here. Its effects on the linear stability and dynamic behavior of the maglev system are investigated. It is found that a Hopf bifurcation can take place when the time delay exceeds certain values. The stability condition of the maglev system with the time delay is acquired. The direction and stability of the Hopf bifurcation are determined by constructing a center manifold and by applying the normal form method. Finally, numerical simulations are performed to verify the analytical result.

关键词：延时反馈控制稳定性磁力悬浮火车系统霍普夫分岔规格化形式