检索结果-南通市图书馆

Role of slip and {10-12} twin on the crystal plasticity in Mg-RE alloy during deformation process at room temperature

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21期80卷 279-296页

作者： Yunwei Gui Yujie Cui Huakang Bian Quanan Li lingxiao Ouyang Akihiko Chiba Department of Materials Processing Graduate School of EngineeringTohoku University6-6-11 AobaAramakiAoba-kuSendai980-8579Japan Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendai980-8577Japan School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang471023China

The deformation mechanism of slips and twins has a considerable influence on the plasticity of magnesium alloys. However, the roles of slips and twins in the room-temperature deformation of Mg-rare earth(Mg-RE) alloys with high contents of rare earth elements is rarely investigated. Here, the microstructural evolution and deformation mechanism of an aged Mg-5 Y-2 Nd-3 Sm-0.5 Zr alloy during uniaxial compression at room temperature were systematically investigated using in-situ electron-backscattered diffraction and transmission electron microscopy. The results indicated that in the early stage of deformation, the Mg-RE alloy was mainly controlled by the slip of dislocations in the basal plane and the coordinated c-axis strain of the {10-12} twin. With an increase in the strain, the grain orientation became more suitable for the initiation of pyramidal Ⅱ dislocations in the later stage of deformation;these dominated the deformation mechanism. In the twin evolution of the Mg-RE alloy, there were three types of twin-twin interaction behaviors:(i) single twin variant 'parallel' structure,(ii) single twin variant 'cross' structure, and(iii) multi twin variant 'cross' structure. In addition, three types of twin-grain boundary interaction behaviors were summarized:(i) twin 'refracting through' grain boundary,(ii) twin'parallel through' grain boundary, and(iii) twin 'fusing through' grain boundary, which are expected to act as new means and solutions for the twin strengthening of magnesium alloys.

关键词： Mg-RE alloy Crystal plasticity In-situ EBSD Dislocation Twinning

Emission Enhancement of Fluorescent Molecules by Antireflective Arrays

在线全文

学校读者我要写书评

暂无评论

Research 2019年第1期2019卷 115-122页

作者： Hongbo Xu lingxiao Liu Fei Teng Nan Lu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of Technology150001 HarbinChina State Key Laboratory of Supramolecular Structure and Materials College ChemistryJilin University130012 ChangchunChina

Traditional fluorescence enhancement based on a match of the maximum excitation or emission of fluorescence molecule with the spectra of the nanostructure can hardly enhance blue and red fluorescent ***,an enhanced method which is a new strategy based on the antireflective array has been developed to enhance the emission of blue and red fluorescent *** fluorescence emission is enhanced by increasing the absorption at excitation wavelengths of the fluorescent molecules and reducing the fluorescent energy dissipation with an antireflective *** introducing the antireflective arrays,the emission enhancement of blue and red fluorescent molecules is,respectively,up to 14 and 18 *** is a universal and effective strategy for enhancing fluorescence emission,which could be applied to enhance the intensity of organic LED and imaging.

关键词： excitation introducing Fluorescent

Impact of the amount of PEG on prodrug nanoassemblies for efficient cancer therapy

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

Asian Journal of Pharmaceutical Sciences 2022年第2期17卷 241-252页

作者： Yaqiao Li lingxiao Li Qianhui Jin Tian Liu Jin Sun Yongjun Wang Zhijun yang Zhonggui He Bingjun Sun Wuya College of Innovation Shenyang Pharmaceutical UniversityShenyang 110016China School of Chinese Medicine Hong Kong Baptist UniversityHong Kong 999077China

PEGylation has been widely used to improve the pharmacokinetic properties of prodrug self-assembled nanoparticles(prodrug-SANPs).However,the impacts of the amount of PEG on the self-assemble stability,cellular uptake,pharmacokinetics,and antitumor efficacy of prodrug-SANPs are still ***,selenoether bond bridged docetaxel dimeric prodrug was synthesized as the model *** prodrug-SANPs were designed by using different mass ratios of prodrugs to PEG(W_(prodrug)/W_(DSPE-mPEG2000)=10:0,9:1,8:2,7:3 and 6:4),and defined as Pure drug NPs,9:1NPs,8:2NPs,7:3 NPs and 6:4 NPs,***,8:2 NPs formed the most compact nanostructure,thus improving the self-assemble stability and pharmacokinetics *** addition,the difference of these prodrug-SANPs in cellular uptake was investigated,and the influence of PEG on cytotoxicity and antitumor efficacy was also clarified in *** 8:2 NPs exhibited much better antitumor efficacy than other prodrug-SANPs and even commercial *** findings demonstrated the pivotal role of the amount of PEG on prodrug-SANPs.

关键词： PEGylation Prodrug Self-assembly nanoparticles Docetaxel Oxidation responsive

Clinical Evaluation of Traumatic Ciliochoroidal Detachment with Surgical Treatment

在线全文

学校读者我要写书评

暂无评论

Eye Science 2013年第3期28卷 124-128,139页

作者： Jiangang yang Qianying Liu Xiaoyan Li lingxiao Zhou Pengrui Sun XiaoHua Wang Department of Ophthalmology First Affiliated Hospital of Xi'an Medical University Department of Ophthalmology Second Affiliated Hospital of Medical CollegeXi'an Jiaotong University

Purpose: To determine the clinical features of traumatic ciliochoroidal detachment(CCD), and to evaluate the surgical ***: We retrospectively reviewed the records of 37 consecutive patients with traumatic CCD who underwent surgical procedures,.including ciliary body suturing,.transscleral cyclophotocoagulation,.and cyclocryopexy..A complete ocular examination was performed at pre-surgery and at periodical post-surgery follow-ups. We compared visual acuity(VA),intraocular pressure.(IOP),.and morphologic changes with UBM among the different surgical procedures at the presurgery and periodical ***:.The mean IOP was 6.62 mmHg, and the median VA was 20 / 200 at baseline..The mean final IOP was 11.03mmHg,.and the final median VA improved to 20 / 50..IOPs were significantly different in post-surgery compared with those at baseline(P=0.000) among the ciliary body suturing,cyclophotocoagulation, and cyclocryopexy groups. However,no significant differences were noted at each follow-up among the 3 groups(P>0.05). The post-surgical morphological figures consisted of complete reattachment, partial reattachment,and the complete detachment. Cyclocryopexy(71.4%), suturing(68.4%), and cyclophotocoagulation(63.6%) produced similar surgical outcomes of the complete reattachment based on UBM ***:Prompt treatment and periodic follow-ups are necessary after traumatic CCD, based on accurate dimensions and configuration by UBM. The appropriate choice of surgical procedures is pivotal for an optimal outcome.

关键词：手术治疗临床特点脉络膜外伤性睫状形态学变化评价手术效果

Temporal and spatial variations of net primary productivity and its response to groundwater of a typical oasis in the Tarim Basin, China

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2021年第11期13卷 1142-1154页

作者： SUN lingxiao YU yang GAO Yuting ZHANG Haiyan YU Xiang HE Jing WANG Dagang Ireneusz MALIK Malgorzata WISTUBA YU Ruide State Key Laboratory of Desert and Oasis Ecology Xinjiang Institute of Ecology and GeographyChinese Academy of SciencesUrumqi 830011China University of Chinese Academy of Sciences Beijing 100049China Cele National Station of Observation and Research for Desert-Grassland Ecosystems Cele 848300China University of Silesia in Katowice Institute of Earth SciencesPolish-Chinese Centre for Environmental ResearchBankowa 1240-007 KatowicePoland School of Environment and Material Engineering Yantai UniversityYantai 264005China

Net primary productivity (NPP) of the vegetation in an oasis can reflect the productivity capacity of a plant community under natural environmental conditions. Owing to the extreme arid climate conditions and scarce precipitation in the arid oasis regions, groundwater plays a key role in restricting the development of the vegetation. The Qira Oasis is located on the southern margin of the Taklimakan Desert (Tarim Basin, China) that is one of the most vulnerable regions regarding vegetation growth and water scarcity in the world. Based on remote sensing images of the Qira Oasis and daily meteorological data measured by the ground stations during the period 2006-2019, this study analyzed the temporal and spatial patterns of NPP in the oasis as well as its relation with the variation of groundwater depth using a modified Carnegie Ames Stanford Approach (CASA) model. At the spatial scale, NPP of the vegetation decreased from the interior of the Qira Oasis to the margin;at the temporal scale, NPP of the vegetation in the oasis fluctuated significantly (ranging from 29.80 to 50.07 g C/(m2•month)) but generally showed an increasing trend, with the average increase rate of 0.07 g C/(m2•month). The regions with decreasing NPP occupied 64% of the total area of the oasis. During the study period, NPP of both farmland and grassland showed an increasing trend, while that of forest showed a decreasing trend. The depth of groundwater was deep in the south of the oasis and shallow in the north, showing a gradual increasing trend from south to north. Groundwater, as one of the key factors in the surface change and evolution of the arid oasis, determines the succession direction of the vegetation in the Qira Oasis. With the increase of groundwater depth, grassland coverage and vegetation NPP decreased. During the period 2008-2015, with the recovery of groundwater level, NPP values of all types of vegetation with different coverages increased. This study will provide a scientific basi

关键词： net primary productivity Carnegie Ames Stanford Approach groundwater depth land use NDVI Qira Oasis

Correlation,superconductivity and topology in graphene moirésuperlattice

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2023年第4期18卷 199-207页

作者： lingxiao Li Min Wu Xiaobo Lu International Centre for Quantum Materials Peking UniversityBeijing 100871China

Moirésuperlattices created by stacking different pieces of two-dimensional layered materials with a slight lattice mismatch have recently emerged as an exceptional platform for exploring emergent quantum *** stark contrast to the“parent”materials,the electronic band structures are significantly modified from moiréengineering due to the large-scale periodic moirépotential and interlayer *** this paper,we mainly focus on the recent progresses achieved in graphene-based moirésystems which have been a condensed-matter playground showing unprecedented abundance of quantum states such as strongly correlated states,superconductivity and novel band topologies.

关键词： twisted graphene moirésuperlattices correlation superconductivity topology

Core–Shell Microfiber Encapsulation Enables Glycerol‑Free Cryopreservation of RBCs with High Hematocrit

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第1期16卷 35-54页

作者： Xianhui Qin Zhongrong Chen lingxiao Shen Huilan Liu Xilin Ouyang Gang Zhao Department of Electronic Engineering and Information Science University of Science and Technology of ChinaHefei 230027People’s Republic of China School of Biomedical Engineering Anhui Medical UniversityHefei 230022People’s Republic of China Department of Blood Transfusion The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230001People’s Republic of China The Fourth Medical Center Chinese PLA General HospitalBeijing 100089People’s Republic of China

Cryopreservation of red blood cells(RBCs)provides great potential benefits for providing transfusion timely in *** concentrations of glycerol(20%or 40%)are used for RBC cryopreservation in current clinical practice,which results in cytotoxicity and osmotic injuries that must be carefully ***,existing studies on the low-glycerol cryopreservation of RBCs still suffer from the bottleneck of low hematocrit levels,which require relatively large storage space and an extra concentration process before transfusion,making it inconvenient(time-consuming,and also may cause injury and sample lose)for clinical *** this end,we develop a novel method for the glycerol-free cryopreservation of human RBCs with a high final hematocrit by using trehalose as the sole cryoprotectant to dehydrate RBCs and using core–shell alginate hydrogel microfibers to enhance heat transfer during *** from previous studies,we achieve the cryopreservation of human RBCs at high hematocrit(>40%)with high recovery(up to 95%).Additionally,the washed RBCs post-cryopreserved are proved to maintain their morphology,mechanics,and functional *** may provide a nontoxic,high-efficiency,and glycerol-free approach for RBC cryopreservation,along with potential clinical transfusion benefits.

关键词： Cryopreservation Human red blood cells Core-shell microfibers Trehalose Hematocrit

Grain refinement and weak-textured structures based on the dynamic recrystallization of Mg–9.80Gd–3.78Y–1.12Sm–0.48Zr alloy

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2021年第2期9卷 456-466页

作者： Yunwei Gui lingxiao Ouyang Yujie Cui Huakang Bian Quanan Li Akihiko Chiba Department of Materials Processing Graduate School of EngineeringTohoku University6-6-11 AobaAramakiAoba-kuSendai 980-8579Japan Institute for Materials Research Tohoku University2-1-1 KatahiraAoba-kuSendai 980-8577Japan School of Materials Science and Engineering Henan University of Science and TechnologyLuoyang 471023China Collaborative Innovation Center of Nonferrous Metals Henan ProvinceLuoyang 471023China

We utilized electron backscatter diffraction to investigate the microstructure evolutions of a newly developed magnesium-rare earth alloy(Mg–9.80 Gd–3.78 Y–1.12 Sm–0.48 Zr)during instantaneous hot indirect *** equiaxed fine-grained(average grain size of 3.4±0.2μm)microstructure with a weak texture was *** grain refinement was mainly attributed to the discontinuous dynamic recrystallization(DDRX)and continuous DRX(CDRX)processes during the hot indirect extrusion *** twin boundaries formed during the initial deformation stage effectively increased the number of high angle grain boundaries(HAGBs),which provided sites for new grain nuclei,and hence,resulted in an improved DDRX *** with DDRX,CDRX processes characterized by low angle grain boundary(LAGB)networks were also observed in the grain interior due to effective dynamic recovery(DRV)at a relatively high temperature of 773 K and high strain ***,LAGB networks were transformed into HAGB networks by the progressive rotation of subgrains during the CDRX process.

关键词： Magnesium-rare earth(Mg-Re)alloy Grain refinement Discontinuous dynamic recrystallization(DDRX) Continuous dynamic recrystallization(CDRX) Hot indirect extrusion

Climate change, water resources and sustainable development in the arid and semi-arid lands of Central Asia in the past 30 years

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2019年第1期11卷 1-14页

作者： YU yang PI Yuanyue YU Xiang TA Zhijie SUN lingxiao Markus DISSE ZENG Fanjiang LI Yaoming CHEN Xi YU Ruide Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Research Center for Ecology and Environment of Central Asia Chinese Academy of Sciences Cele National Station of Observation and Research for Desert-Grassland Ecosystem University of Chinese Academy of Sciences Chinese Academy of Forestry State Key Laboratory of Desert and Oasis Ecology Chinese Academy of Sciences Chair of Hydrology and River Basin Management Technical University of Munich School of Environment and Material Science Yantai University

The countries of Central Asia are collectively known as the five "-stans": Uzbekistan, Kyrgyzstan, Turkmenistan, Tajikistan and Kazakhstan. In recent times, the Central Asian region has been affected by the shrinkage of the Aral Sea, widespread desertification, soil salinization, biodiversity loss, frequent sand storms, and many other ecological disasters. This paper is a review article based upon the collection, identification and collation of previous studies of environmental changes and regional developments in Central Asia in the past 30 years. Most recent studies have reached a consensus that the temperature rise in Central Asia is occurring faster than the global average. This warming trend will not only result in a higher evaporation in the basin oases, but also to a significant retreat of glaciers in the mountainous areas. Water is the key to sustainable development in the arid and semi-arid regions in Central Asia. The uneven distribution, over consumption, and pollution of water resources in Central Asia have caused severe water supply problems, which have been affecting regional harmony and development for the past 30 years. The widespread and significant land use changes in the 1990 s could be used to improve our understanding of natural variability and human interaction in the region. There has been a positive trend of trans-border cooperation among the Central Asian countries in recent years. International attention has grown and research projects have been initiated to provide water and ecosystem protection in Central Asia. However, the agreements that have been reached might not be able to deliver practical action in time to prevent severe ecological disasters. Water management should be based on hydrographic borders and ministries should be able to make timely decisions without political intervention. Fully integrated management of water resources, land use and industrial development is essential in Central Asia. The ecological crisis should provide

关键词： Central Asia climate change water resources arid and semi-arid lands land use changes sustainable development socio-economic development