检索结果-南通市图书馆

Nuclear Science and Techniques 2023年第5期34卷 101-111页

作者： Fei Han Wen-Rui Wang dan-yi Li Mou-Hua Wang Ji-Hao Li Lin-Fan Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China

Silver nanoclusters(AgNCs)are a new type of nanomaterials with similar properties to molecules and unique *** applications of AgNCs can be significantly expanded by combining them with different matrix materials to obtain AgNC *** irradiation techniques,we developed a simple two-step method for preparing silver nanocluster ***,polyacrylic acid(PAA)chains were grafted onto the surface of a PE film as templates(PE-g-PAA).Subsequently,silver ions were reduced in situ on the surface of the template material to obtain the AgNC composites(AgNCs@PE-g-PAA).The degree of AgNC loading on the composite film was easily controlled by adjusting the reaction *** loaded AgNCs were anchored to the carboxyl groups of the PAA and wrapped in the graft *** particle size of the AgNCs was only 4.38±0.85 nm,with a very uniform particle size *** AgNCs@PE-g-PAA exhibited fluorescence characteristics derived from the *** fluorescence of the AgNCs@PE-g-PAA was easily quenched by Cr^(3+)*** composite can be used as a fluorescence test paper to realize visual detection of Cr^(3+).

关键词： Silver nanoclusters Irradiation grafting Irradiation reduction In situ preparation Fluorescence detection

Effect of Ti_(p) Content on the Work Hardening and Softening Behavior of Mg-Zn-Ca Alloy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第3期37卷 551-560页

作者： Jin-Kai Zhang Cui-Ju Wang yi-dan Fan Chao Xu Kai-Bo Nie Kun-Kun Deng Shanxi Key Laboratory of Advanced Magnesium-Based Materials College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China

The Ti_(p)/ZX60 composites with different Ti_(p) contents were prepared by semi-solid stirring *** extrusion,the microstructure,work hardening and softening behavior of the Ti_(p)/ZX60 composites were analyzed compared with the ZX60(Mg-6Zn-0.2Ca)*** results showed that the addition of Ti_(p) could not only promote the nucleation of dynamic recrystallized(DRXed)grains,but also be propitious to the refinement of DRXed *** increasing Ti_(p) content,the size of DRXed grains decreased accompanied with increasing volume fraction of DRXed *** the Ti_(p) content increased to 15 vol.%,the average size and volume fraction of DRXed grains reached to~0.32μm and 93.2%,***,both the strength and elongation were improved by the addition of Ti_(p).With increasing content of Ti_(p),a substantial increase in the strength was achieved with little change in the ***,the elongation decreased sharply when the Ti_(p) content further increased to 15 vol.%.The addition of Ti_(p) led to an increase in the work hardening rate,which gradually increased with increasing Ti_(p) ***,the softening rate did not demonstrate the same tendency with increasing Ti_(p) *** the conventional ceramic particles,the Ti_(p) can be deformed in coordination with the matrix alloy,which imparted a higher softening rate to the matrix *** though the softening rate improved as the Ti_(p) content increased from 5 to 10 vol.%,it dropped deeply as the Ti_(p) content increased to 15 vol.%owing to the fracture of Ti_(p) during extrusion.

关键词： Titanium particle content Particle reinforced magnesium matrix composites Work hardening Softening behavior Mechanical properties

Point defect concentrations of L12-Al3X(Sc, Zr, Er)

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 699-706页

作者： Shun-Ping Sun Xiao-Ping Li Jie Yang Hong-Jin Wang Yong Jiang dan-Qing yi School of Materials Engineering Jiangsu University of Technology Changzhou 213001 China School of Materials Science and Engineering Central South University Changsha 410083 China

The point defect concentrations of L12-A13X（Sc, Zr, Er） were systematically investigated using the first- principle calculations with thermodynamics approach. The results show that the constitutional point defects of off- stoichiometric L12-A13X（Sc, Zr, Er） prefer to occur in X sublattice, that is X anti-site in X-rich alloy and X vacancy in Al-rich alloy, respectively. And A1 anti-site also has a high density in Al-rich Llz-A13X（Sc, Er）. It is found that the point defect concentrations of stoichiometric L12-A/3X（Sc, Zr） follow in the sequence as： A1 vacancies （VA0 〉 X vacancies （Vx）〉 X anti-sites （XA1）〉 A1 anti- sites （Alx）. The point defect concentration of stoichio- metric A13Er is similar to that of L12-A13X（Sc, Zr）. The result suggests that the A1 vacancy （VA1） is a dominant point defect in L12-A13X（Sc, Zr, Er）. A simple parameter Hvx-HVA1 can be used for a rough estimation of the point defect concentrations in L12-A13X structure. Some rules of point defect concentrations for L12-A13X（Sc, Zr, Er） are also revealed.

关键词： L12-A13X(Sc Zr Er) Point defect First-principle calculation

Predictions for cross sections of light proton-rich isotopes in the ^(40)Ca + ~9Be reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2018年第7期42卷 59-64页

作者： yi-dan Song Hui-Ling Wei Chun-Wang Ma Institute of Particle and Nuclear Physics Henan Normal University Xinxiang 453007 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 China

The cross sections for Z=10-19 with isotopes Tz=-3/2 to -5 in the 140A MeV 40Ca ＋ 9Be projectile fragmentation reaction have been predicted. An empirical formula based on the correlation between the cross section and average binding energy of an isotope has been adopted to predict the cross section. The binding energies in the AME16, WS4, and the theoretical prediction by the spherical relativistic continuum Hartree-Bogoliubov theory have been used. Meanwhile, the FRACS parametrization and the modified statistical abrasion-ablation model are also used to predict the cross sections for the proton-rich isotopes. The predicted cross sections for the Tz=-3 isotopes are close to 10-10 mb, which hopefully can be studied experimentally. In addition, based on the predicted cross sections, Z=14 is suggested to be a new magic number in the light proton-rich nuclei with Tz ≤ -3/2, for which the phenomenon is much more evident than it is from the average binding energy per nucleon.

关键词： proton-drip line proton-rich isotopes proton magic number binding energy projectile fragmentation

Synthesis and Phase Behavior of Poly(1-alkyne) with Liquid Crystalline-induced Luminescence Enhancement

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2010年第6期26卷 1035-1044页

作者： ZHOU dan CHEN yi-wang CHEN Lie LI Fan NIE Hua-rong YAO Kai Institute of Polymers Department of Chemistry Nanchang University Nanchang 330031 P. R. China

Poly（1-alkyne） with octoxy spacer —{[HC=C（CH2）8O—terphenyl—CN]}n—（PA8CN） and terphenyl liquid crystalline pendant was synthesized,and the effects of structure on the optical properties,especially the liquid crystallinity behavior of the polymer and monomer were *** monomer was prepared in high yields（92.30%） by coupling and etherification reactions and successfully polymerized in the presence of Rh catalyst and Et3N cocatalyst in high yields with trans-rich（86.27%） stereoregular *** to the monomer showing mixed monolayer structure,its corresponding polymer PA8CN formed homogeneous monolayer *** photoexcitation,strong blue emission peak of PA8CN appeared at 413 nm[fluorescence quantum yield,ΦF = 68% when excited at 330 nm in tetrahydrofuran（THF） solution].Compared with its solid film photoexcitated at 330 nm at room temperature,the UV light-emitting band of PA8CN solid film from its liquid crystalline with liquid nitrogen quenched rapidly at 236 ℃ was red-shift 10 nm with higher intensity,which may be ascribed to the fact that the effectual conjugation and the order degree of the molecule in the liquid crystalline state of the polymer were enhanced,the energy loss caused by the thermal vibration was decreased,thus resulting in the observed hyperchromic effect.

关键词： Polyacetylene Liquid crystallinity Phase transition Photoluminescence

Preparation of antibacterial non-woven AgNCs@PP-g-PAA via radiation method

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2023年第9期34卷 21-31页

作者： Fei Han Wen-Rui Wang dan-yi Li Si-yi Xu ying Su Lin Lin Man-Li Lu Ji-Hao Li Lin-Fan Li Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Wuwei Institute of New Energy Wuwei 733000China

With the growing threat of airborne epidemics,there has been an increasing emphasis on personal *** serve as our primary external defense against bacteria and viruses that might enter the respiratory ***,it’s crucial to develop a polypropylene(PP)nonwoven fabric with quick antibacterial capabilities as a key component for *** study introduces silver nanoclusters(AgNCs)into non-woven PP using radiation technology to infuse antibacterial ***,a solid ligand(PP-g-PAA)was procured via radiation grafting of the ligand polyacrylic acid(PAA),which was incorporated into the nonwoven PP with the aid of a crosslinking agent at a lower absorbed ***,AgNCs were synthesized in situ on PP-g-PAA via an interaction between PAA and AgNCs,leading directly to the formation of AgNCs@PP-g-PAA *** to the hydrophilicity of PAA,AgNCs@PP-g-PAA maintains good moisture permeability even when the voids are heavily saturated with PAA gel,preventing droplet aggregation by diffusing droplets on the surface of the *** feature enhances the comfort of the *** importantly,due to the incorporation of AgNCs,AgNCs@PP-g-PAA demonstrates outstanding antibacterial effects against Escherichia coli and Staphylococcus aureus,nearly achieving an instant“touch and kill”*** conclusion,we synthesized a modified nonwoven fabric with significant antibacterial activity using a simple synthetic route,offering a promising material that provides improved personal protection.

关键词： Silver nanoclusters Radiation technology Antibacterial

POLYBINAPHTHYLS INCORPORATING (R)-2,2'-BINAPHTHO-20-CROWN-6 AND NAPHTHYL MOITIES

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2006年第6期24卷 619-625页

作者： dan Zhu yi-xiang Cheng Xiao-wei Zou Ling-wu Chen Jin-feng Song Zhi-liu Wang College of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China

Chiral polymer was synthesized by the polymerization of （R）-6,6＇-bistributylstannyl-2,2＇-binaphtho-20-crown-6 （M-1） with 1,4-dibromo-2,3-bisbutoxy-naphthyl （M-2） by Pd（PPhs）4 catalyzed Stille coupling reaction. Both monomer and polymer were analyzed by NMR, MS, FT-IR, UV, polarimetry, DSC-TGA, CD, fluorescent spectroscopy and GPC. The major difference between monomer and polymer is that a long wavelength Cotton Effect was observed for the polymer due to its more extended conjugation in the repeating unit and a highly rigid backbone in the polymer chain. Polymer has strong blue fluorescence due to the efficient energy migration from the extended n-electronic structure of the repeating unit of the polymer to the chiral binaphthyl core and is expected to have potential application in the materials of fluorescent sensors and chiral chromatographic packing for resolution ofracemic amino acid.

关键词： (R)-2,2'-Binaphtho-20-crown-6 Chiral polymer Fluorescence Stille reaction.

Clinical characteristics of adult-type annular pancreas:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第22期8卷 5722-5728页

作者： dan yi Xiao-Bo Ding Shan-Shan Dong Chen Shao Li-Jing Zhao Department of Hepatobiliary and Pancreatic Surgery First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Radiology First Hospital of Jilin UniversityChangchun 130021Jilin ProvinceChina Department of Pathology Beijing You’an HospitalBeijing 100069China Department of Rehabilitation School of NursingJilin UniversityChangchun 130021Jilin ProvinceChina

BACKGROUND Annular pancreas(AP)is a rare congenital abnormal rotation of the *** rarely occurs in *** tumors and ampullary tumors are related to AP,so the discovery and treatment of AP are *** SUMMARY This study investigated the clinical manifestations,imaging features,complications,and treatment of six patients diagnosed with AP at the Department of Hepatobiliary and Pancreatic Surgery,First Hospital of Jilin University from January 2010 to June *** were four males and two females,with an average age of 56.00±9.86 years *** this study,abdominal pain and jaundice were the main clinical *** can show the“crocodile jaw sign”or“double bubble sign”.CONCLUSION For patients with duodenal or biliary obstruction,physicians should give priority to AP when imaging examinations suggest that the duodenum is wrapped with tissue similar to the density of the *** patients should actively undergo surgical treatment.

关键词： Annular pancreas Pancreas/abnormalities Congenital abnormalities Biliary obstruction Duodenal obstruction Case report

ADSC-Exos outperform BMSC-Exos in alleviating hydrostatic pressure-induced injury to retinal ganglion cells by upregulating nerve growth factors

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

World Journal of Stem Cells 2023年第12期15卷 1077-1092页

作者： Zhi-Kun Zheng Lei Kong Min Dai yi-dan Chen Yan-Hua Chen Department of Ophthalmology Affiliated Hospital of Yunnan University/Yunnan Eye HospitalKunming 650021Yunnan ProvinceChina

BACKGROUND Mesenchymal stem cells(MSCs)have protective effects on the cornea,lacrimal gland,retina,and photoreceptor cell damage,which may be mediated by exosomes(exos)released by *** To investigate the ameliorating effect of exos derived from different MSCs on retinal ganglion cell(RGC)injury induced by hydrostatic *** The RGC injury model was constructed by RGC damage under different hydrostatic pressures(40,80,120 mmHg).Then RGCs were cultured with adipose-derived stem cell(ADSC)-Exos and bone marrow-derived stem cell(BMSC)-*** Counting Kit-8,transmission electron microscopy,flow cytometry,immunofluorescence,real-time quantitative polymerase chain reaction,and western blotting were performed to detect the ameliorating effect of exos on pressure-induced RGC *** ADSC-Exos and BMSC-Exos were successfully isolated and *** gibbosity of RGCs was lower,the cells were irregularly ellipsoidal under pressure,and the addition of ADSC-Exos and BMSC-Exos significantly restored RGC ***,the proliferative activity of RGCs was increased and the apoptosis of RGCs was ***,the levels of lactate dehydrogenase and apoptosis-related proteins were increased,and the concentrations of antiapoptotic proteins and neurotrophic factors were decreased in damaged ***,the above indicators were significantly improved after ADSC Exos and BMSC-Exos *** These findings indicated that ADSC-Exos and BMSC-Exos could ameliorate RGC injury caused by hydrostatic pressure by inhibiting apoptosis and increasing the secretion of neurotrophic factors.

关键词： Adipose-derived stem cells Bone marrow-derived stem cells Exosomes Glaucoma

Primary Clinical Evaluation of the Joint Replacement for the Treatment of the First Metatarsophalangeal Arthritis

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 Medical Sciences Journal 2011年第1期26卷 14-19页

作者： Qi-yi Li Jin Jin Xi-sheng Weng Jin Lin yi-dan Zhang Gui-xing Qiu Department of Orthopaedics Peking Union Medical College HospitalChinese Academy of Medical Sciences & Peking Union Medical CollegeBeijing 100730China

Objective To retrospectively assess the primary clinical results of a cohort of the first metatarsophalangeal joint replacement with double-stemmed hinge silicone implant. Methods A total of 12 patients (15 feet) received the joint replacement with double-stemmed hinge silicone implant. There were 2 males and l0 females with a mean age of 61.4 (range, 56-75) years old. Of them, 9 cases (11 feet) were hallux valgus with osteoarthritis; 1 case (2 feet) was rheumatic arthritis; 2 cases (2 feet) were traumatic arthritis. The sub)ective and objective results were evaluated during follow-up. Results All of the patients were followed up regularly with an average of 24.7 months, ranging from 12 to 38 months. Ten patients were completely satisfied with the operation; I patient showed partial saris- faction, and 1 patient was not satisfied because of the first matatarsophalangeal joint pain due to severe hy- perosteogeny surrounding the cut bone surface 3 years after the operation. Osteolysis around the implant occurred in 2 cases without clinical symptoms, and no special treatment was given. Conclusion The joint replacement is a preferable method in alleviating pain and improving walking function with proper indication.

关键词： joint replacement arthritis implant