检索结果-南通市图书馆

Temperature-dependent Crystallization and Phase Transition of Poly(L-lactic acid)/CO_(2) Complex Crystals

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2021年第4期39卷 484-492,I0007页

作者： Ying Zheng Cai-Liang Zhang Yong-Zhong Bao Guo-Rong shan Peng-Ju pan State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Institute of Zhejiang University-Quzhou Quzhou 324000China

Semicrystalline polymers can crystallize in the unique crystalline polymorph and show different phase behaviors under the high-pressure CO_(2) *** such unique crystallization and phase transition behavior is of fundamental importance for the CO_(2)-assisited processing of semicrystalline ***,we investigated the polymorphic crystalline structure,phase transition,and structure-property relationships of poly(L-lactic acid)(PLLA)treated by CO_(2) at different pressures(1-13 MPa)and crystallization temperatures(Tc's,10-110℃).PLLA crystallized in the PLLA/CO_(2) complex crystals under 7-13 MPa CO_(2) at TCS50℃but the common a crystals under the high-pressure CO_(2) at TC≥70℃.Solid-state nuclear magnetic resonance analysis indicated that the PLLA/CO_(2) complex crystals possessed weaker interactions between the PLLA chains than the common a *** PLLA/CO_(2) complex crystals were metastable and transformed into the thermally stable a crystals via the solid-to-solid route during heating or annealing at the temperature above 50℃.The complex crystals of PLLA produced at low Tc was more ductile than the a crystals due to the lower crystallinity and the plasticizing effect of CO_(2).

关键词： Poly(lactic acid) CO_(2) Complex crystal Phase transition

Investigation of suitable precursors for manganese oxide catalysts in ethyl acetate oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2021年第6期33卷 17-26页

作者： Yan Zhang Meng Wang Shunyu Kang Tingting pan Hua Deng Wenpo shan Hong He Center for Excellence in Regional Atmospheric Environment and Key Laboratory of Urban Pollutant Conversion Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control Ningbo Urban Environment Observation and Research StationChinese Academy of SciencesNingbo 315800China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China

The control of ethyl acetate emissions from fermentation and extraction processes in the pharmaceutical industry is of great importance to the *** have developed three Mn_(2)O_(3)catalysts by using different Mn precursors(MnCl_(2),Mn(CH_(3)COO)_(2),MnSO_(4)),named as Mn_(2)O_(3)-Cl,-Ac,-SO_(4).The tested catalytic activity results showed a sequence with Mn precursors as:Mn_(2)O_(3)-Cl>Mn_(2)O_(3)-Ac>Mn_(2)O_(3)-SO_(4).The Mn_(2)O_(3)-Cl catalyst reached a complete ethyl acetate conversion at 212℃(75℃lower than that of Mn_(2)O_(3)-SO_(4)),and this high activity 100%could be maintained high at 212℃for at least 100 *** characterization data about the physical properties of catalysts did not show an obvious correlation between the structure and morphology of Mn_(2)O_(3)catalysts and catalytic performance,neither was the surface area the determining factor for catalytic activity in the ethyl acetate *** we firstly found there is a close linear relationship between the catalytic activity and the amount of lattice oxygen species in the ethyl acetate oxidation,indicating that lattice oxygen species were essential for excellent catalytic *** H_(2)temperature-programmed reduction(H_(2)-TPR)results,we found that the lowest initial reduction temperature over the Mn_(2)O_(3)-Cl had stronger oxygen mobility,thus more oxygen species participated in the oxidation reaction,resulting in the highest catalytic *** convenient preparation,high efficiency,and stability,Mn_(2)O_(3)prepared with MnCl_(2)will be a promising catalyst for removing ethyl acetate in practical application.

关键词： Ethyl acetate Catalytic oxidation Manganese Precursor Lattice oxygen species

A new strategy for obtaining highly concentrated phosphorus recovery solution in biofilm phosphorus recovery process

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第2期34卷 366-375页

作者： Wanjing Yang Jie shan Yang pan Zhen Bi Yong Huang Hao Zhang Min Ni School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China

Recovery of phosphorus(P)from wastewater is of great significance for alleviating the shortage of P *** present,the P recovery process is faced with the problem of excessive organic carbon consumption when obtaining a P-concentrated recovery *** study proposed a new strategy to obtain a more highly concentrated P recovery solution with minimal carbon consumption by strengthening the P storage capacity of the biofilm.A biofilm sequencing batch reactor(BSBR)process was modified to treat synthetic *** effect of the dissolved oxygen(DO)concentration on the P storage capacity of the biofilm was investigated at DO concentrations of DO 3.5 mg/L(P_(L))and DO 6.5 mg/L(P_(H)).The results showed a maximum P storage of 101.2 and 149.6 mg-P/g-mixed liquid suspended solids under the two *** the P storage capacity of the biofilm resulted in a net increase in the P recovery rate,which was as high as 66.96%in a harvesting cycle,and total soluble P>220 mg/L in the P recovery solution was successfully ***,the carbon cost of P recovery in the BSBR was reduced to 41.57 g-chemical oxygen demand/gP,and the carbon utilization efficiency was *** highlight the new strategy,the P recovery performance of the BSBR was given and the relationship between P content and anaerobic P release was *** addition,the changes in the microbial communities under P_(L) and P_(H) conditions were analyzed.

关键词： Biofilm sequencing batch reactor Phosphorus storage capacity Phosphorus release Phosphorus recovery

Correction Factors of the Measurement Errors of the LAMOST-LRS Stellar Parameters

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2023年第1期23卷 202-216页

作者： Shuhui Zhang Guozhen Hu Rongrong Liu Cuiyun pan Lu Li Zhengyi shao Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryChinese Academy of SciencesShanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Centre for Astrophysics and Planetary Science Racah Institute of PhysicsThe Hebrew UniversityJerusalem91904Israel Key Lab for Astrophysics Shanghai 200234China

We aim to investigate the propriety of stellar parameter errors of the official data release of the LAMOST lowresolution spectroscopy(LRS)*** diagnose the errors of radial velocity(RV),atmospheric parameters([Fe/H],Teff,logg)andα-enhancement([α/M])for the latest data release version of DR7,including 6,079,235effective spectra of 4,546,803 *** on the duplicate observational sample and comparing the deviation of multiple measurements to their given errors,we find that,in general,the error of[α/M]is largely underestimated,and the error of RV is slightly *** define a correction factor k to quantify these misestimations and correct the errors to be expressed as proper internal *** this self-calibration technique,we find that the k-factors significantly vary with the stellar spectral types and the spectral signal-to-noise ratio(S/N).Particularly,we reveal a strange but evident trend between k-factors and error themselves for all five stellar *** errors tend to have smaller k-factor values,i.e.,they were more *** the correction,we recreate and quantify the tight correlations between S/N and errors,for all five parameters,while these correlations have dependence on spectral *** also suggests that the parameter errors from each spectrum should be corrected ***,we provide the error correction factors of each derived parameter of each spectrum for the entire LAMOST-LRS DR7 and plan to update them for the later data releases.

关键词： catalogs-methods data analysis-stars fundamental parameters

Mixed Aleatory-epistemic Uncertainty Modeling of Wind Power Forecast Errors in Operation Reliability Evaluation of Power Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2022年第5期10卷 1174-1183页

作者： Jinfeng Ding Kaigui Xie Bo Hu Changzheng shao Tao Niu Chunyan Li Congcong pan Powerand Energy Reliability Research Center State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing400044China

As the share of wind power in power systems continues to increase, the limited predictability of wind power generation brings serious potential risks to power system reliability. Previous research works have generally described the uncertainty of wind power forecast errors(WPFEs) based on normal distribution or other standard distribution models, which only characterize the aleatory uncertainty. In fact, epistemic uncertainty in WPFE modeling due to limited data and knowledge should also be addressed. This paper proposes a multi-source information fusion method(MSIFM) to quantify WPFEs when considering both aleatory and epistemic uncertainties. An extended focal element(EFE) selection method based on the adequacy of historical data is developed to consider the characteristics of WPFEs. Two supplementary expert information sources are modeled to improve the accuracy in the case of insufficient historical data. An operation reliability evaluation technique is also developed considering the proposed WPFE model. Finally,a double-layer Monte Carlo simulation method is introduced to generate a time-series output of the wind power. The effectiveness and accuracy of the proposed MSIFM are demonstrated through simulation results.

关键词： Wind power forecast error(WPFE) epistemic uncertainty multi-source information fusion method(MSIFM) operation reliability extended focal element(EFE) double-layer Monte Carlo simulation

Enhanced zinc storage performance of mixed valent manganese oxide for flexible coaxial fiber zinc-ion battery by limited reduction control

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第15期74卷 52-59页

作者： Xiaobei Zang Li Lingtong Jiaxin Meng Lijia Liu Yuanyuan pan Qingguo shao Ning Cao School of Materials Science and Engineering.China University of Petroleum(East China) Qingdao266580China Department of Chemistry University of Western Ontario1151 Richmond StreetLondonOntarioN6A5B7Canada State Key Laboratory of Heavy Oil Processing Institute of New EnergyCollege of Chemical EngineeringChina University of Petroleum(East China)Qingdao266580China

While manganese-based cathodes have been intensively studied for zinc-ion batteries(ZIBs),the limited rate capability and cycle life have always been a difficult problem to be ***,we report a mixed valent manganese oxide(MnOx)cathode with superior electrochemical performance,which exhibits a high specific capacity of 450 mA h/g at 0.2 C and a satisfactory specific capacity of 158.3 mA h/g at a high rate of 5 *** mixed cathode system reduces the charge transfer resistance,and show good surface stability and adsorption properties,so it is beneficial for the storage of Zn^(2+).Meanwhile,coaxial fiber ZIBs(CFZIBs)with splendid flexibility are assembled utilizing the elaborately prepared cathode *** CFZIBs achieve a reversible capacity of 255.8 m A h/g and the capacity retention rate is as high as 80%after 1000 bending *** study provides new opportunities for designing ZIBs with high performance and high flexibility.

关键词： Mixed valent manganese oxide Limited reduction Storage mechanism Flexible zinc-ion battery Coaxial fiber structure

Remodeling the tumor microenvironment by vascular normalization and GSH-depletion for augmenting tumor immunotherapy

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第2期35卷 329-334页

作者： Jin Wang Qingqing Zhang Yanchen Li Xiaoyan pan Yuanyuan shan Jie Zhang School of Pharmacy Health Science CenterXi'an Jiaotong UniversityXi'an 710061China Department of Pharmacy The First Affiliated Hospital of Xi'an Jiaotong UniversityXi'an 710061China

Remodeling tumor microenvironment(TME)is a very promising and effective strategy to enhance the effects of chemotherapy,photodynamic therapy,and *** of tumor vasculature as well as depletion of glutathione(GSH)can improve the ***,we developed a novel therapeutic nanoparticle functional enzyme ultra QDAU5 nanoparticles(FEUQ Nps)based on a fluorescence-on and releasable strategy by combining a vascular normalization inducer,a GSH depleting agent,and an activated *** which the cleavage of disulfide bonds releases active molecules that induce vascular normalization and improve the hypoxic *** addition,it may deplete GSH in cancer cells,thus inducing the production of reactive oxygen species(ROS)and lipid peroxide(LPO)and promoting iron *** may also lead to endoplasmic stress and release of calmodulin,which activates the immune ***,quenched fluorophores are turned on in the presence of galactosidase(GLU)for tumor-specific *** summary,we developed novel therapeutic agent nanoparticles with the function of vascular normalization inducers to achieve specific labeling of hepatocellular carcinoma while exerting efficient antitumor effects in vivo.

关键词： Vascular normalization Tumor microenvironment GSH depletion Ferroptosis Activated immune

Urban expansion and intra-urban land evolution as well as their natural environmental constraints in arid/semiarid regions of China from 2000–2018

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2023年第7期33卷 1419-1441页

作者： pan Tao KUANG Wenhui shao Hua ZHANG Chi WANG Xiaoyu WANG Xinqing School of Geography and Tourism Qufu Normal UniversityRizhao 276826ShandongChina Key Laboratory of Land Surface Pattern and Simulation Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyCASUrumqi 830011China shandong Provincial Key Laboratory of Water and Soil Conservation and Environmental Protection College of Resources and EnvironmentLinyi UniversityLinyi 276000ShandongChina

Rapid urbanization has occurred in arid/semiarid China,threatening the sustainability of fragile dryland ecosystems;however,our knowledge of natural environmental constraints on multiscale urban lands in this region is still *** solve this issue,this study retrieved 15-m multiscale urban *** indicated that urban area increased by 68%during 2000–2018,and one-third of the increase was contributed by only three large *** coverage of impervious surface area(ISA) and vegetated area(VA) increased by 16.6%and 1.38%,*** land-cover change may be helpful in suppressing wind erosion and sand *** also found that the newly urban lands had relatively lower ISA and higher VA than the old urban lands,indicating an improved human settlement *** environmental constraints on urban expansion were identified,with cities in oasis urban environments(OUEs) that had water supply expanding 150% faster than cities in desert urban environments(DUEs).Urban development was also constrained by terrain,with 73% of the ISA expansion occurring in relatively flat ***,the aggregated pattern of urbanization and the increase in ISA and VA in the newly urbanized lands have improved water-use efficiency and ecological services and benefited desert ecosystem protection in arid/semiarid China.

关键词： urbanization natural environmental constraints pixel and subpixel land change arid and semiarid regions of China

Evolving molecular subtyping of breast cancer advances precision treatment

在线全文

学校读者我要写书评

暂无评论

Cancer Biology & Medicine 2024年第9期21卷 731-739页

作者： Rui shan Lei-Jie Dai Zhi-Ming shao Yi-Zhou Jiang Department of Breast Surgery Fudan University Shanghai Cancer CenterShanghai 200032China Department of Oncology Shanghai Medical CollegeFudan UniversityShanghai 200032China

Breast cancer is the second most prevalent cancer *** 2022,approximately 2.3 million newly diagnosed cases of female breast cancer occurred worldwide,and more than 665 thousand people lost their lives to this disease^... 详细信息

关键词： breast cancer Breast