检索结果-南通市图书馆

Chinese Chemical Letters 2021年第1期32卷 485-488页

作者： wutong du Jin Tong Wei Deng Mingxue Wang Shuyan Yu Beijing Key Laboratory for Green Catalysis and Separation Department of Chemistry and Chemical IndustryCollege of Environmental and Energy EngineeringBeijing University of TechnologyBeijing 100124China

Two types of palladiu m(Ⅱ)-based metallacalixarenes[ML]^(2+)and[ML_(2)]^(2+)have been synthesized through coordination-driven self-assembly from a series of flexible pyridine-bridged diimidazole ligands[2,6-bis((1 H-imidazol-1-yl)methyl)pyridine(L^(1)),2,6-bis((1 H-benzo[d]imidazol-1-yl)methyl)pyridine(L^(2)),2,6-bis((1 H-naphtho[2,3-d]imidazol-1-yl)methyl)pyridine(L^(3))],with palladium(II)-based building blocks[Pd(BF_(4))_(2)(M^(1)-BF_4)and(tmeda)Pd(NO_(3))_(2)(M^(2)-NO_(3))(tmeda=N,N,N',N'-tetramethyl-ethylenediamine)].All complexes were characterized by NMR spectroscopy(^(1)H NMR and^(13)C NMR),mass spectrometry(CSIMS,ESI-HRMS)and elemental *** single crystal X-ray diffraction analysis of[M^(1)L^(2)_2](NO_(3))_(2),[M^(1)L^(3)_2](NO_(3))_(2),[M^(1)L^(3)_2](PF_6)_2 and[M~2 L^(3)](NO_(3))_(2)further confirmed the uniquely single bowl-shape and double bowl-shape *** anion binding properties within the metallacalixarenes as receptors were also investigated by NMR titration experiments in DMSO.

关键词： Self-assembly Diimidazole ligand Metallacalixarenes Anion receptors

Photocatalytic Degradation of 4-Chlorophenol by Gd-Doped β-Bi2O3 Under Visible Light Irradiation

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2019年第1期35卷 120-124页

作者： LIN Shijing du wutong TONG Laga JI Tao JIAO Xinxin College of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617P.R.China

Chlorophenols are known as persistent organic ***,research on the removal of chlorophenols has attracted widespread ***,the photocatalytic degradation of 4-chlorophenol by Gd-doped β-Bi2O3 under visible light irradiation was *** results showed that Gd-doped β-Bi2O3 materials are efficient catalysts for the photocatalytic degradation of chlorophenols,and 2%(atomic traction)Gd-doped β-Bi2O3 exhibits the highest photocatalytic activity for 4-chlorophenol degradation,because doping an appropriate amount of Gd^3+ions can effectively reduce the recombination rate of the photogenerated e^-/h^+pairs and then enhance the photocatalytic *** the reaction was carried out at 25 ℃ for 6 h using the 2% Gd-doped/β-Bi2O3 micro/nano materials of 200 mg and at air flow rate of 40 mL/min,the degradation rate of 4-chlorophenol reached 92.3%.Additionally based on the analysis of the products,it was speculated that the dominant photocatalytic degradation mechanism of 4-chlorophenol by Gd-doped β-Bi2O3 under visible light irradiation is an oxidative process involving an attack by the hydroxyl radical.

关键词： Bi2O3 Doping Photocatalysis:4-Chlorophenol

A versatile AIE fluorogen with selective reactivity to primary amines for monitoring amination,protein labeling,and mitochondrial staining

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2023年第1期4卷 250-259页

作者： Xinyuan He Huilin Xie Lianrui Hu Pengchao Liu Changhuo Xu Wei He wutong du Siwei Zhang Hao Xing Xinyue Liu Hojeong Park Tsz Shing Cheung Min-Hui Li Ryan T.K.Kwok Jacky W.Y.Lam Jian Lu Ben Zhong Tang Department of Chemistry Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and ReconstructionState Key Laboratory of Molecular NeuroscienceDivision of Life Science and Department of Chemical and Biological EngineeringThe Hong Kong University of Science and TechnologyKowloonHong KongChina Department of Mechanical Engineering City University of Hong KongGreater Bay Joint DivisionShenyang National Laboratory for Materials ScienceKowloonHong KongChina Chimie ParisTech PSL University Paris CNRSInstitut de Recherche de Chimie ParisParisFrance Department of Chemistry Guangdong-Hongkong-Macou Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsThe Hong Kong University of Science and TechnologyKowloonHong KongChina Center for Aggregation-Induced Emission SCUT-HKUST Joint Research InstituteState Key Laboratory of Luminescent Materials and DevicesSouth China University of TechnologyGuangzhouChina School of Science and Engineering Shenzhen Key Laboratory of Functional Aggregate MaterialsThe Chinese University of Hong KongShenzhen CityGuangdongChina

Specific bioconjugation for native primary amines is highly valuable for both chemistry and biomedical *** all the efforts,scientists lack a proper strategy to achieve high selectivity for primary amines,not to mention the requirement of fast response in real ***,we report a chromone-based aggregation-induced emission(AIE)fluorogen called CMVMN as a self-reporting bioconjugation reagent for selective primary amine identification,and its applications for monitoring bioprocesses of amination and protein *** is AIE-active and capable of solid-state ***,its electrospun films are manufactured for visualization of amine diffusion and leakage *** also shows good biocompatibility and potential mitochondria-staining ability,which provides new insight for organelle-staining probe *** with its facile synthesis and good reversibility,CMVMN would not only show wide potential applications in biology,but also offer new possibilities for molecular engineering.

关键词： aggregation-induced emission(AIE) bioconjugation mitochondria-staining primary amines protein labeling

A Secure and Privacy-Preserving Watermark Based Medical Image Sharing Method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第5期29卷 819-825页

作者： CHEN Lanxiang BAI wutong YAO Zhiqiang College of Mathematics and Informatics Fujian Normal University

The patients' medical image data are one of the most important data in e-health. Medical image data usually play a crucial role in disease diagnosis and implicate unpredictable potential values for improving diagnostic methods and adjusting diagnostic results. To exploit their incredible potential values, medical images need to be shared among different hospitals, medical institutions and insurance companies and others. But how to securely and effectively share these medical image data becomes a challenging problem. In this paper, we proposed to combine encryption and digital watermark technology to achieve a secure and privacy-preserving medical image sharing method. The QR code image of the concatenation of authoritative diagnosis results and the hash of the original medical image is generated as the watermark image. The Discrete cosine transform(DCT)and Inverse DCT(IDCT) algorithms are utilized to embed the watermark image. As the watermarked medical images are desensitized, they are stored to a smart contract based blockchain, such as Ethereum, to achieve secure and fair sharing between data owners and users. The experimental results show that the proposed method can resist several attacks meanwhile it is efficient in medical image sharing.

关键词： Medical image E-health Image watermark Privacy preserving Data sharing

Plasma levels of luteinizing hormone and prolactin in relation to double brooding in Great Tit(Parus major)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Avian Research 2022年第1期13卷 102-107页

作者： Xudong Li Wenyu Xu Jiangping Yu wutong Zhang Haitao Wang Jilin Engineering Laboratory for Avian Ecology and Conservation Genetics School of Life SciencesNortheast Normal UniversityChangchun130024China Jilin Key Laboratory of Animal Resource Conservation and Utilization Northeast Normal UniversityChangchun130024China

The reproductive behaviors of birds are mainly controlled by the hypothalamus-pituitary-gonad *** studies have shown that reproductive hormones are tightly linked to the breeding ***,only a few studies have examined the temporal trend of hormone levels among different reproductive stages in multiple brooded *** investigated the changes in plasma luteinizing hormone(LH)and prolactin(PRL)concentrations during different reproductive stages of the facultative double-brooded Great Tit(Parus major).We found that the concentrations of LH and PRL in females were significantly higher than those in *** had significantly higher LH and lower PRL concentrations in the pre-breeding period than in the first/second brooding periods,and there were no significant changes between the first and second brooding *** concentrations of LH and PRL in males had no significant difference between the pre-breeding period and the first brooding periods,while LH and PRL concentrations in the second brooding period were significantly higher than those in the first brooding *** conclude that there are sex-based differences between LH and PRL at different stages of *** changes in LH and PRL in both males and females should be related to their physiological *** for males,individuals with higher levels of LH and PRL are more likely to maintain second clutches.

关键词： Birds Great Tit Luteinizing hormone Prolactin Seasonal breeding

Optically Active Chiral Auxiliary Benzyloxyphenylglycinol for Preparation of Oxazolidine and Its Derivatives

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2005年第4期21卷 476-479页

作者： FUYing-huan CHENJin wutong-hao BAIXu TheCenterforCombinatorialChemistryandDrugDiscovery JilinUniversityChangchun130012P.R.China

To investigate the recovery of amino alcohols as chiral auxiliaries, optically active p-benzyloxyphenylglycinol and its corresponding oxazolidine of 1-naphthylcarboxaldehyde were prepared. Grignard additions to the oxazolidine followed by electrophilic quench and acidic hydrolysis afforded an aldehyde(compound 8)(later it was reduced to an alcohol, compound 9) in an excellent enantiomeric excess and a good recovery of the chiral amino alcohol. This research provides a model study of chiral amino alcohols in solid phase asymmetric synthesis.

关键词： Chiral auxiliary p-Benzyloxyphenylglycinol Grignard addition Oxazolidine Asymmetric synthesis

Sliding Mode Control with Unidirectional Auxiliary Surfaces Based on Double Power Reaching Law and Disturbance Observer 36

在线全文

学校读者我要写书评

暂无评论

Sliding Mode Control with Unidirectional Auxiliary Surfaces ...

Preparation, Characterization of Hydrotalcites and the Catalytic Properties in Synthesis of o-Phenylphenol over Pt/CHT

第36届中国控制会议

作者： wutong Xu Long Qiu Dian Sheng Qing Liang Department of Automation University of Science and Technology of China

ISBN: (纸本)9781538629185

For a class of nonlinear continuous systems,this paper proposes a sliding mode control with unidirectional auxiliary surfaces（UAS-SMC） based on a double power reaching law and a disturbance observer（DO）.Firstly,according to the nonlinear continuous systems,the switching surfaces and the controller based on the proposed law and DO are designed to weaken the chattering phenomenon caused by disturbance ***,theoretical analyses prove that the system states can converge to the switching surfaces in a finite time and slide to the origin on the surface *** formula of the convergence time was ***,the simulation results show that the UAS-SMC method based on double power reaching law（UASDPRLSMC） has faster convergence speed and better ability to suppress the chattering than ordinary UAS-SMC and UAS-SMC based on the power reaching law（UASPRL-SMC）.

关键词： Nonlinear continuous system Sliding mode control Double power reaching law Disturbance observer Unidirectional auxiliary surface

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2005年第1期21卷 83-87页

作者： YANGPiao-ping WANGZhen-lü YUJian-feng LIUQing-sheng XUEBin ZHANGZuo-wang wutong-hao CollegeofChemistry JilinUniversityChangchun130023P.R.China

Mg/Al mixed oxides with molar ratios of 2_6 of Mg to Al used as supports for platinum catalysts were obtained by the thermal decomposition method. The effect of the composition of the mixed oxides on the physicochemical properties was studied by TPD, nitrogen sorption, XRD and TG-DTA characterization methods. The synthesis of o-phenylphenol(OPP) from a dimer(obtained from cyclohexanone condensation) was investigated over Pt/CHT catalysts and compared with those over Pt/MgO and Pt/Al 2O 3 catalysts. These catalysts show a high activity and selectivity for OPP, with a conversion reaching 93.8% and a selectivity reaching 87.9% in some experiments. For Pt/CHTx catalysts, the calcined hydrotalcites exhibited strong base sites, which were necessary to catalyze the synthesis of OPP.

关键词： Hydrotalcite CHT OPP Dimer dehydrogenation n(Mg)/n(Al) ratio

Gas sensing selectivity of oxygen-regulated SnO2 films with different microstructure and texture

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第10期35卷 2232-2237页

作者： Ruiwu Li Yanwen Zhou Maolin Sun Zhen Gong Yuanyuan Guo Xitao Yin Fayu Wu wutong Ding School of Material Science and Metallurgy University of Science and Technology LiaoningAnshan114051China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China

The selectivity of gas sensing materials is increasingly important for their applications. The oxygenregulated SnO2 films with(110) and(101) preferred orientation were obtained through magnetron sputtering, followed by annealing treatment. Their micro-structure, surface morphology and gas response were investigated by advanced structural characterization and property measurement. The results showed that the as-prepared(110)-oriented SnO2 film was oxygen-rich and had more adsorption sites while the as-prepared(101)-oriented SnO2 film was oxygen-poor and more sensitive to de-oxidation.H2 gas sensitivity, response speed, selectivity between H2 and CO of the(110)-orientated SnO2 film was superior to that of the(101)-orientated SnO2 film. After treated at high temperature and high vacuum,the reduction of gas-sensing properties of the annealed(110) SnO2 film was much more than that of the annealed(101) SnO2 film. The lattice oxygen was responsible for the difference in gas-sensing response between(110) and(101)-oriented SnO2 films under oxygen regulation. This work indicated the gassensing selectivity of the different crystal planes in SnO2 film, providing a significant reference for design and extension of the related materials.

关键词： Gas sensor SnO2 Oxygen regulation Preferred orientation H2 selectivity

Gas-initiation under UV and liquid-grafting polymerization on the surface of polysulfone hollow fiber ultrafiltration membrane by dynamic method

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2005年第3期17卷 465-468页

作者： SHENYing-jie WUGuang-xia XUShu-guang ZHONGHui ZHANGShao-lai ZHANGXue-zhu ZHAOXian-hong wutong ZHANGWei-jun BeijingTongRenTangCompanyLimitedScientificResearchInstitute Beijing100011China ResearchCenterforEco-EnvironmentalSciences ChineseAcademyofSciencesBeijing100085China

Using the inner-surface of polysulfone hollow fiber ultrafiltration membranes as grafted layer, the method of gas-initiation and liquid-polymerization has been studied, which aimed to adjust the diameter of the pores in the membranes. The degree of polymerization varied with the changes of the parameters, such as irradiation time, monomer concentration, temperature and time of polymerization and so on. The results indicated that using benzophenone(BP) which is in a gaseous condition as photo-initiator, acrylamide as graft monomer, the polyacrylamide chain was grafted on the surface of membranes. After the surface membrane being modified, the water flux and retention altered,and thus it can be seen that the diameter of the pores in the membrane was altered. These experiments contribute to finding a new way to produce the hollow fiber membrane with the small pore size and are extraordinarily worth developing and studying.

关键词： polysulfone hollow fiber membrane photografting gas-initiation surface- modification