检索结果-南通市图书馆

Single-atom Ag-loaded carbon nitride photocatalysts for efficient degradation of acetaminophen:The role of Ag-atom and O_(2)

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2024年第5期139卷 12-22页

作者： Yi Yuan Wen-Long wang zhi-wei wang Jin wang Qian-Yuan Wu Key Laboratory of Microorganism Application and Risk Control of Shenzhen Guangdong Provincial Engineering Research Center for Urban Water Recycling and Environmental SafetyInstitute of Environment and EcologyShenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen InstituteShenzhen 518055China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518071China

Carbon nitride has been extensively used as a visible-light photocatalyst,but it has the disadvantages of a low specific surface area,rapid electron-hole recombination,and relatively low light *** this study,single-atom Ag was successfully anchored on ultrathin carbon nitride(UTCN)via thermal polymerization,the catalyst obtained is called *** Ag hardly changed the carbon nitride's layered and porous physical *** exhibited efficient visible-light photocatalytic performances in the degradation of various recalcitrant pollutants,eliminations of 85% were achieved by visible-light irradiation for *** with Ag improved the photocatalytic performance of UTCN by narrowing the forbidden band gap from 2.49 to 2.36 e V and suppressing electron-hole pair *** addition,Ag doping facilitated O_(2) adsorption on UTCN by decreasing the adsorption energy from -0.2 to -2.22 e V and favored the formation of O_(2)^(·-).Electron spin resonance and radical-quenching experiments showed that O_(2)^(·-)was the major reactive species in the degradation of Acetaminophen(paracetamol,APAP).

关键词： Ag single atom Carbon nitride Photocatalysis Visible light Adsorption energy Reactive species

Effect of solution treatment on microstructure and hardness of rheo-forming AZ91-Y alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2016年第6期13卷 383-388页

作者： zhi-wei wang Hong Yan Wen-xian Huang Department of Materials Processing Engineering School of Mechanical Electrical EngineeringNanchang UniversityNanchang 330031China Key Laboratory of Light Alloy Preparation&Processing Nanchang 330031China Department of Civil Engineering School of Architectural EngineeringJinggangshan UniversityJi'an 343009China

The microstructure and hardness of rheo-forming AZ91-Y alloy before and after solution treatment(ST)have been investigated by means of optical microscope(OM),scanning electron microscope(SEM)equipped with energy dispersive spectroscopy(EDS),X-ray diffraction(XRD)and *** experimental results showed that theβ-Mg17Al12 phase of alloy was nearly dissolved after ST for 5 *** the increasing of ST duration to 28 h,both the primary and secondarily solidifiedα-Mg grains faded *** the same time,the alloy exhibited a much smoother surface due to the diffusion of solute atoms(Al).During ST,the thermal stable phase of Al2 Y produced by ultrasonic vibration retained its size and *** the ST duration was increased,the alloy hardness decreased sharply at first,and then gradually reached a minimum *** alloy's appropriate ST duration at 410°C was approximately 28 h.

关键词： AZ91 alloy rheo-forming rare earth solution treatment hardness

Peptide-Based Electrochemical Biosensors and Their Applications in Disease Detection

在线全文

学校读者我要写书评

暂无评论

Journal of Analysis and Testing 2022年第2期6卷 193-203页

作者： Jin-Ge Zhao Jie Cao wei-zhi wang Key Laboratory of Medical Molecule Science and Pharmaceutics Engineering Ministry of Industry and Information TechnologyKey Laboratory of Cluster Science of Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electro-Photonic Conversion MaterialsSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Biosensors based on small molecule peptides have developed rapidly in the detection of disease markers with the characteristics of high sensitivity, rapid analysis speed and easy miniaturization. The properties of the sensor, such as the sensitivity and detection range, are closely related to the material and structure of the electrodes. The electrodes mainly used in peptidebased biosensors are gold electrodes, glassy carbon electrodes(GCE), indium tin oxide(ITO) conductive glass electrodes and screen-printed electrodes. In addition, to improve the biomolecule loading rate, antifouling performance, electrical conductivity of the biosensor, a variety of nanomaterials and organic molecules are used to construct the biosensor for disease detection. This review summarizes the properties of several commonly used electrodes for peptide-based electrochemical biosensors, and introduces some modified materials of the electrode and their effects on sensor performance. In the future,the peptide-based biosensors will be widely used in clinical detection and other related fields.

关键词： Peptide Biosensor Electrode Nanomaterials

Gastric motor effects of ghrelin and growth hormone releasing peptide 6 in diabetic mice with gastroparesis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2008年第9期14卷 1419-1424页

作者： Wen-Cai Qiu zhi-Gang wang wei-Gang wang Jun Yan Qi Zheng The Affiliated Sixth Hospital of Medical School Shanghai Jiaotong University Shanghai 200233 China

AIM:To investigate the potential therapeutic significance of ghrelin and growth hormone releasing peptide 6 (GHRP-6) in diabetic mice with gastric motility disorders. METHODS: A diabetic mouse model was established by intraperitoneal (ip) injection of alloxan. Diabetic mice were injected ip with ghrelin or GHRP-6 (20-200 μg/kg), and the effects on gastric emptying were measured after intragastric application of phenol red. The effect of atropine, NG-nitro-L-arginine methyl ester hydrochloride (L-NAME) or D-Lys3-GHRP-6 (a growth hormone secretagogue receptor (GHS-R) antagonist) on the gastroprokinetic effect of ghrelin or GHRP-6 (100 μg/kg) was also investigated. The effects of ghrelin or GHRP-6 (0.01-10 μmol/L) on spontaneous or carbachol-induced contractile amplitude were also investigated in vitro, in gastric fundic circular strips taken from diabetic mice. The presence of growth hormone secretagogue receptor 1a transcripts in the fundic strips of diabetic mice was detected by reverse transcriptase polymerase chain reaction (RT-PCR). RESULTS: We established a diabetic mouse model with delayed gastric emptying. Ghrelin and GHRP-6 accelerated gastric emptying in diabetic mice with gastroparesis. In the presence of atropine or L-NAME, which delayed gastric emptying, ghrelin and GHRP-6 (100 μg/kg) failed to accelerate gastric emptying. D-Lys3-GHRP-6 also delayed gastric emptying induced by the GHS-R agonist. Ghrelin and GHRP-6 increased the carbachol-induced contractile amplitude in gastric fundicstrips taken from diabetic mice. RT-PCR confirmed the presence of GHS-R mRNA in the strip preparations. CONCLUSION: Ghrelin and GHRP-6 increase gastric emptying in diabetic mice with gastroparesis, perhaps by activating peripheral cholinergic pathways in the enteric nervous system.

关键词： Gastric emptying Ghrelin Growth hormone releasing peptide 6 Growth hormone secretagogue receptor Diabetic mice

Constitutive equation and hot processing maps of Al-5Ti-1B master alloy

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

Rare Metals 2018年第8期37卷 668-674页

作者： Fu-wei Kang Jie Zhou zhi-wei wang Xue-Min Zhang Yi-Cheng Feng Er-Jun Guo School of Materials Science and Engineering Harbin Universityof Science and Technology Harbin 150040 China Harbin Dong An Engine Group Corporation Ltd. Aviation Industry Corporation of China Harbin 150066 China

The isothermal compression tests of A1-5Ti- 1B master alloy were conducted on the thermal mechanical simulator Gleeble-1500D at the deformation temperature range of 300-450 ℃,the strain rate range of 0.01- 10.00 s^-l, and the engineering strain of 50 %. The effects of deformation temperatures and strain rates on the flow stress were analyzed by the true stress-true strain curves. The result indicates that the flow stress increases with the increase of strain rate, while it decreases with the increase of temperature. The hot deformation activation energy of A1-5Ti-IB master alloy is calculated to be 250.9 ***^-1, and the constitutive equation is established as ε=1.97 x lO^19[sinh（O.O15δ）^11.14exp（-250.9/RT）, and the validity of this constitutive equation is verified. Based on dynamic material model （DMM） criterion, the hot processing map of AI-5Ti-1B master alloy is obtained. The optimum hot extrusion conditions are determined as deformation temperature of 400℃ and strain rate of 1.00 s^-1, and the flow instability only appears at the temperature range of 300-340℃ at the base of the hot processing map.

关键词： Al-5Ti-1B master alloy Flow stress Constitutive equation Hot processing map

A Study on Side Reactions of Hydroxyethylation of 3-Nitro-4- chlorobenzenesulfinic Acid with Ethylene Oxide

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第5期17卷 613-616页

作者： Zhen Tang DONG Zu wang WU zhi wei wang Yun De wang Yin Zhou YU The State Key Laboratory of Fine Chemicals Dalian University of Technology Dalian 116012 Dankong Industrial and Trade Co. Ltd. Taizhou 318000

The reaction of 3-nitro-4-chlorobenzenesulfinic acid and ethylene oxide to obtain 2-nitro-4-（β-hydroxyethylsulfonyl）chlorobenzene had been studied. Except hydroxyethylation on the sulfur atom of 3-nitro-4-chlorobenzenesulfinic acid to form the target product, 2-nitro-4-（β- hydroxyethylsulfonyl）chlorobenzene, there presented three kinds of side reactions： 1. Condensation and elimination of HCI to form biphenyl sulfone derivatives; 2. Addition to give bisulfonyl ethane derivative via vinyl sulfone; and 3. Hydroxylethylation on O-atom to produce hydroxylethylsulfinate due to the tautomerism of sulfinic acid.

关键词： Hydroxyethyl-2-nitrochlorobenzene-4-sulfinate 3-nitro-4-chlorobenzenesulfinic acid,2-nitro-4-(β- hydroxyethylsulfonyl)chlorobenzene.

Large solar energetic particle event that occurred on 2012 March 7 and its VDA analysis

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2016年第8期16卷 33-42页

作者： Liu-Guan Ding Xin-Xin Cao zhi-wei wang Gui-Ming Le School of Physics and Optoelectronic Engineering Institute of Space WeatherNanjing University of Information Science and Technology National Center for Space Weather China Meteorological Administration

On 2012 March 7, the STEREO Ahead and Behind spacecraft, along with near-Earth spacecraft （e.g. SOHO, Wind） situated between the two STEREO spacecraft, observed an extremely large global solar energetic particle （SEP） event in Solar Cycle 24. Two successive coronal mass ejections （CMEs） have been detected close in time. From the multi-point in-situ observations, it can be found that this SEP event was caused by the first CME, but the second one was not involved. Using velocity dispersion analysis （VDA）, we find that for a well magnetically connected point, the energetic protons and electrons are released nearly at the same time. The path lengths to STEREO-B （STB） for protons and electrons have a distinct difference and deviate remarkably from the nominal Parker spiral path length, which is likely due to the presence of interplanetary magnetic structures situated between the source and STB. Also, the VDA method seems to only obtain reasonable results at well-connected locations and the inferred release times of energetic particles in different energy channels are similar. We suggest that good-connection is crucial for obtaining both an accurate release time and path length simultaneously, agreeing with the modeling result of wang ＆ Qin （2015）.

关键词： Sun particle emission -- Sun coronal mass ejection (CME) -- method velocity dispersionanalysis (VDA)

Effect of Ultrasonication on Optical Properties and Electronic States of Conjugated Polymer MEH-PPV

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2008年第5期24卷 653-657页

作者： WU Meng YANG Gui-zhong wang Meng wang wei-zhi wang Min LIU Tian-xi Key Laboratory of Molecular Engineering of Polymers of Ministry of Education Department of Macromoleeular Science Laboratory of Advanced Materials Fudan University Shanghai 200433 P. R. China

Poly[2-methoxy-5-（2＇-ethyl-hexyloxy）-1,4-phenylene vinylene]（MEH-PPV）solutions with different concen-trations were prepared in chloroform for different ultrasonication *** ultraviolet absorption and photoluminescence（PL）spectra of the MEH-PPV solutions were measured,and the electronic states of the polymer chains under different experimental conditions were *** results showed that the effects of ultrasonication on the dilute and concentrated solutions were *** ultrasonication,the intensity of the absorption peak at 280 nm significantly decreased,relative to the absorption peak at 500 nm for both dilute and concentrated solutions,indicating that the proportion of the two excited states in the polymer chains had *** dilute MEH-PPV solutions,the blue-shifted absorption（at about 500 nm）and PL spectra show that ultrasonication also led to polymer chain degradation and thus shortened the effective conjugation *** concentrated solutions,however,the peak positions of the absorption spectra remained *** addition,the effects of the solution temperatures on the optical spectra for the MEH-PPV solutions were also discussed.

关键词： MEH-PPV Optical property Electronic state Ultrasonication

Is the enhancement of type Ⅱ radio bursts during CME interactions related to the associated solar energetic particle event?

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2019年第1期19卷 47-60页

作者： Liu-Guan Ding zhi-wei wang Li Feng Gang Li Yong Jiang School of Physics and Optoelectronic Engineering Nanjing University of Information Science and Technology Institute of Space Weather Nanjing University of Information Science and Technology Key Laboratory of Dark Matter and Space Astronomy Purple Mountain ObservatoryChinese Academy of Sciences Department of Space Science and CSPAR University of Alabama in Huntsville

We investigated 64 pairs of interacting-CME events identified from simultaneous observations by the SOHO and STEREO spacecraft from January 2010 to August 2014, to examine the relationship between large SEP events in the energy range of ～25 to～60 MeV and properties of the interacting *** found that during CME interactions, the large SEP events in this study were all generated by CMEs with the presence of enhanced type Ⅱ radio bursts, which also have wider longitudinal distributions compared to events without a type Ⅱ radio burst or its enhancement(almost always associated with small SEP events).It seems that the signature of type Ⅱ radio burst enhancement is a good discriminator between large SEP and small or no SEP event producers during CME interactions. The type Ⅱ radio burst enhancement is more likely to be generated by CME interactions, with the main CME having a larger speed(v), angular width(WD), mass(m) and kinetic energy(Ek), and taking over the preceding CMEs. The preceding CMEs in these instances have higher v, WD, m and Ekthan those in CME pairs missing type Ⅱ radio bursts or enhancements. Generally, the values of these properties in the type-Ⅱ-enhanced events are typically higher than the corresponding non-type-Ⅱ or non-type-Ⅱ-enhanced cases for both the main and preceding CMEs. Our analysis also revealed that the intensities of associated SEP events correlate negatively with the intersection height of the two CMEs. Moreover, the overlap width of two CMEs is typically larger in type-Ⅱ-enhanced events than in non-type-Ⅱ or non-type-Ⅱ-enhanced events. Most type-Ⅱ-enhanced events and SEP events are coincident and are almost always made by the fast and wide main CMEs that sweep fully over relatively slower and narrower preceding CMEs. We suggest that a fast CME with enough energy completely overtaking a relatively narrower preceding CME, especially at low height, can drive a more energetic shock signified by the enhanced type Ⅱ radio bursts. The shock m

关键词： Sun:coronal mass ejections(CMEs) Sun:radio radiation Sun:particle emission Sun:CME interaction