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Release of bioactive active iodine in kelp

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Journal of Environmental Sciences 2005年第2期17卷 241-244页

作者： SUNXiang-wu WENGHuan-xin QINYa-chao InstituteofEnvironmentandBiogeochemistry ZhejiangUniversityHangzhou310027China

The release process and influencing factors of bioactive iodine of kelp are systemically studied by leaching experiment. The results showed that the bioactive iodine of kelp can be released rapidly and the principal form of iodine in lixivium is I -. There is a dynamic process between the release and absorption of iodine. With the increase of leaching water, the gross amounts of released iodine rise. There also exists a transforming process among I -, IO - 3 and organic iodine in lixivium.

关键词： kelp iodine absorption release lixivium

EXPERI MENTAL INVESTIGATION INTO HOT WATER SLOT JETS WITH NEGATIVELY BUOYANCYIN CROSS FLOW

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Journal of Hydrodynamics 2005年第4期17卷 412-417页

作者： YANG Zhong-hua HUAI Wen-xin DAI Hui-chao State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 China

An experiment was conducted to examine the near-field behavior of negatively buoyant planar jets in flowing environment. Hot water jet was projected downwards at dif fercnt angles from a slot into a uniform cross flow. Micro Acoustic Doppler Velocimeter （Micro ADV） system is used to measure the velocity and turbulent fluxes of Reynolds stresses. The whole field temperatures were measured with fast response thermocouples. Pure jets experiments were made also to study the effect of buoyancy in negatively buoyant jets. It is found that the influenced area of hot jets is larger than which of pure jets when the jet angle is 90° and the influenced area of hot jets is smaller than which of pure jets when the jet angle is 45°. The difference is not obvious at 60° angle jets. This means that the rising of temperature has effect not only on negatively buoyancy, but also on the intensity of turbulence. The contrast of these two influences dominates the trend of jet flow.

关键词： negatively buoyant planar jets Micro Acoustic Doppler Velocimeter (Micro ADV) Reynolds stresses

Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide)under the Catalysis of Tin

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Chinese Journal of Polymer Science 2021年第8期39卷 966-974,I0005页

作者： Li-Dong Feng xin-chao Bian Gao Li Xue-Si Chen Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Jilin Biomedical Polymers Engineering Laboratory Changchun 130022China

The effect of exogenous hydroxyl,carboxyl groups and/or Sn^(2+) on pyrolysis reactions of poly(L-lactide)(PLLA)was investigated by thermogravimetric analysis(TGA).The activation energy(fa)of pyrolysis reactions was estimated by the Kissinger-Akahira-Sunose *** kinetic models were also explored by the Malek method,and the random degradation behavior was determined by comparing the plots of ln{-ln[1-(1-w)05]}versus 1/7for experimental data from TGA with model *** pyrolysis reaction rate of PLLA was affected slightly by exogenous hydroxyl and carboxyl groups at lower levels of Sn with 65-70 mg·kg^(-1)but increased appreciably in the presence of extraneous Sn^(2+),-COOH/Sn^(2+),or-OH/Sn^(2+).The Ea values for the pyrolysis reactions of the PLLAs that provided lactide were different under the catalysis of Sn2+in different chemical environments because Sn^(2+) can form the new Sn-carboxylate and Sn-alkoxide with exogenous carboxyl and hydroxyl groups,which were different in steric hindrance for the formation of activated complex between Sn^(2+) and *** the catalysis of Sn^(2+),a lactide molecule can be directly eliminated selectively at a random position of PLLA molecular chains,and the molecular chain of PLLA cannot change two PLLA fragments at the elimination site of ***,it was regenerated into a new PLLA molecule with the molecular weight reduced by 144 g·mol^(-1).

关键词： Poly(L-lactide) Pyrolysis mechanism Carboxyl group Hydroxyl group Tin

Crosslinked Colorless Polyimide Films via Oxazole Groups as Crosslinking Agent:Preparation and Properties

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Chinese Journal of Polymer Science 2024年第12期42卷 1905-1914,I0007页

作者： He Wang Zhen-chao Liu Xue Shang Li-Dong Feng xin-chao Bian Xue-Si Chen School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China Key Laboratory of Polymer Ecomaterials Changchun Institute of APPlied ChemistryChinese Academy of SciencesChangchun 130022China

A series of transparent crosslinked colorless polyimide(CPI)films are prepared from 3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA),2,2'-bis(trifluoro-methyl)benzidine(TFMB),and 4,4'-oxydianiline(ODA)by thermal imidization,incorporating varying contents of 2,2'-(1,3-phenylene)bis(2-oxazoline)(1,3-PBO)as the crosslinking *** the incorporation of the crosslinking structure,the CPI films show good optical transparency(approximately 85%winthin visible light range),enhanced glass transition temperature(from 325℃to 341℃),and improved thermal stability,and tensile ***,compared with the pristine uncrosslinked CPI,these crosslinked CPI films significantly increase in elongation at break(from 5.4%to 44.2%).Furthermore,the new approach ensures that crosslinked CPIs improve heat resistance and mechanical properties,while avoiding the embrittlement of *** study also offeres straightforward preparation methods for optically transparent crosslinked polyimides without additional processing *** these results make this approach can effectively improve the competitive performance of the CPI films for potential applications in microelectronic and optoelectronic fields.

关键词： Polyimide Colorless transparent film Crossking structure Optical property Thermal property Mechanical property

Micro-nano structural electrode architecture for high power energy storage

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Journal of Semiconductors 2023年第5期44卷 1-6页

作者： xin chao Chengzhan Yan Huaping Zhao Zhijie Wang Yong Lei Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444China Fachgebiet Angewandte Nanophysik Institut für Physik&IMN MacroNanoTechnische Universität IlmenauIlmenau98693Germany Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China

The necessity and superiorities of micro-nano structural electrodes toward high power:Electrochemical energy storage(EES)technologies have achieved great success in portable electronics and electric vehicles owing to their environmental friendliness and cost *** the promotional concepts such as the Internet of Things and ultra-high efficiency self-powered systems in recent years,there are substantial demand for superior EES systems,including but not limited to high-performance,miniaturization and multifunction[1−4].In a particular EES cell,active materials are carried by electrodes as the basic building blocks of energy storage or *** innovation(includes composition,structure,size and morphology)has revealed remarkable energy density,power density and lifespan for associated devices in the lab setting of low mass loading slurry-coating electrodes[5].

关键词： structural power electrode

Minimally Invasive Perventricular Device Closure of Ventricular Septal Defect: a Comparative Study in 80 Patients

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Chinese Medical Sciences Journal 2014年第2期29卷 98-102页

作者： xin-chao Yang De-bin Liu Department of Cardiovascular Surgery the First Clinical Hospital of Lanzhou University

Objective To evaluate the efficacy of minimally invasive perventricular device closure of ventricular septal defect(VSD). Methods Between September 2011 and February 2013, we collected 40 patients who underwent perventricular closure via a small lower sternal incision(minimally invasive group), aged 15.5±3.5 years(12 months to 32 years) with a body weight of 24.2±7.5 kg(10.8-58.0 kg). The mean size of VSD was 5.6±0.5 mm(2-14 mm). Another 40 patients were included as the surgical group, receiving the conventional surgical repair of VSD. The device of the minimally invasive group was released under the guidance of transesophageal echocardiography. Success rate, cardiac indicators, and clinical outcomes of the 2 groups were compared. Results The patients in the surgical group and those in the minimally invasive group showed similar results in success rate(both 97.5%). The procedure time, intensive care unit stay, hospital stay, and postoperative recovery time in the minimally invasive group were significantly shorter than those in the surgical group(58±21 minutes versus 145±26 minutes, 2±1 days versus 8±3 days, 5±1 days versus 16±6 days, 3±1 days versus 90±20 days, all P<0.05). The minimally invasive group had a higher incidence of conduction anomalies(17.5% versus 2.5%, P<0.05). In the follow-up period of 3-12 months, there was no new residual shunt, noticeable aortic regurgitation, significant arrhythmias, or device failure except for new complications in the surgical group. Conclusions The success rate of minimally invasive perventricular device closure of VSD under transesophageal echocardiography guidance is similar to that of conventional surgical repair, but the short-term outcomes of the minimally invasive approach is much better. Long-term follow-up is necessary to confirm the effectiveness of this technique.

关键词： transesophageal echocardiography minimally invasive ventricular septal defect

Detection of Toxoplasma gondii in chicken and soil of chicken farms in Nanjing region,China

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Infectious Diseases of Poverty 2017年第1期6卷 532-539页

作者： xin-chao Liu Yu He Deng-Ge Han Zhen-chao Zhang Ke Li Shuai Wang Li-xin Xu Ruo-Feng Yan Xiang-Rui Li College of Veterinary Medicine Nanjing Agricultural UniversityNanjingJiangsu 210095People’s Republic of China

Background:Soil is increasingly recognized as an important source in the transmission of Toxoplasma gondii(***).The aim of this study was to investigate the presence of *** in the soil and to grasp the relationships between the contamination of soil and chicken ***:PCR method based on ***-conserved gene internal transcribed spacer 1(ITS-1)as target gene and ELISA method(sGRA8-ELISA)using the recombinant protein of shortened GRA8 gene of *** as antigen were developed and *** April 2013 to March 2014,a total of 700 soil samples were collected at various sites located in thirty farms categorized as free range farm and scale farm in Nanjing,Jiangsu,China,in different ***,a total of 350 sera of chickens were collected from free range farms to determine the presence of antibodies against *** using ***:The serological results showed that,antibodies were found in 194 of 250(67.14%)samples from farms with *** positive in soil and 41 of 100 samples from farms with *** negative in soil(41.00%)(P<0.01).The PCR detection of soil samples showed that,7(2.0%)of 350 samples collected from feeding zone in free range farms were found positive of ***,whereas no sample was positive in scale *** the seasonal detections,*** was found in 6(3.33%)samples collected in autumn and 1(0.56%)collected in ***:The results indicated that the contamination of *** in soil in the free range farms was higher than that in the scale farms and seroprevalence of *** in chickens in the farm with soil contamination was higher than that with no soil *** soil contamination might be an effective indicator of *** infection in chickens.

关键词： Toxoplasma gondii Chickens farms Soil Chicken

Dynamic recrystallization mechanism of as-cast nickel base superalloy N10276 during primary hot working

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Journal of Iron and Steel Research International 2023年第4期30卷 825-837页

作者： xin-chao Wang Yan Wang Xiao-jie Lian Mei Xu Li-feng Hou Ying-hui Wei College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina State Key Laboratory of Advanced Stainless Steel Materials Taiyuan Iron and Steel(Group)Co.Ltd.Taiyuan 030003ShanxiChina Technology Center Shanxi Taiyuan Stainless Steel Co.Ltd.Taiyuan 030003ShanxiChina

The dynamic recrystallization(DRX)mechanism of as-cast nickel base superalloy N10276 during primary hot working was investigated by compression tests at temperatures of 1000–1200℃ and strain rates between 0.01 and 10 s^(-1).Optical microscopy,scanning electron microscopy,electron backscattered diffraction technique and transmission electron microscopy were used to characterize the evolution of *** higher deformation temperature or lower strain rate,the true stress–true strain curves exhibit the characteristic of a peak stress followed by a steady state flow stress under large strains,confirming the occurrence of *** degree of DRX increases with elevating deformation *** the progress of DRX,low angle grain boundaries gradually decrease,while high angle grain boundaries increase *** studies have shown that discontinuous dynamic recrystallization is the main recrystallization *** there are few original grain boundaries and twin boundaries,and lack of second phase particles for particle stimulated nucleation,geometrically necessary boundaries are formed as supplementary nucleation sites through sub-grain boundary rotation and deformation twin *** annealing twins dominated by Σ3 grain boundaries are generated in large quantities during the growth of recrystallized grains.

关键词： Dynamic recrystallization mechanism As-cast superalloy N10276 Primary hot working Twin

Machine learning-accelerated discovery of novel 2D ferromagnetic materials with strong magnetization

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Chip 2023年第4期2卷 78-88页

作者： chao xin Yaohui Yin Bingqian Song Zhen Fan Yongli Song Feng Pan School of Science Changchun University of Science and TechnologyJilin Key Laboratory of Solid-State Laser Technology and ApplicationChangchun 130022China School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055China Center forLattice Defectronics&Department of Physics KAISTDaejeon 34141Republic of Korea School of Energy and Power Engineering JiangSuUniversityZhenjiang 212013China

Two-dimensional ferromagnetic(2DFM)semiconductors(metals,half-metals,and so on)are important materials fornext-generation nano-electronic and nano-spintronic ***,these kinds of materials remain scarce,“trial anderror”experiments and calculations are both time-consumingand *** the present work,in order to obtain theoptimal 2DFM materials with strong magnetization,a machinelearning(ML)framework was established to search the 2Dmaterial space containing over 2417 samples and identified 615compounds whose magnetic orders were then determined viahigh-throughput first-principles *** the adoptionof ML algorithms,two classification models and a regressionmodel were *** interpretability of the regressionmodel was evaluated through Shapley Additive exPlanations(SHAP)***,it is found that Cr2NF2 is apotential antiferromagnetic ferroelectric 2D multiferroic *** importantly,60 novel 2DFM candidates werepredicted,and among them,13 candidates have magnetic moments of>7μ***2Cl8,Fe3GeSe2,and Mn4N3S2 were predictedto be novel 2DFM semiconductors,metals,and half-metals,*** the adoption of the ML approach in thecurrent work,the prediction of 2DFM materials with strongmagnetization can be accelerated,and the computation timecan be drastically reduced by more than one order ofmagnitude.

关键词： 2D ferromagnetic Machine learning High through-putscreening DFT Model interpretability