检索结果-南通市图书馆

Dietary reprogram of macrophages for cell competition: a promising strategy for malignant cancer control

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2023年第11期8卷 5153-5155页

作者： jian Chen Zhaoliang su Guangchuan Wang Department of Nephrology Affiliated Hospital of Jiangsu UniversityZhenjiang212013China International Genome Center Jiangsu UniversityZhenjiang212013China State Key Laboratory of Molecular Biology Shanghai Institute of Biochemistry and Cell BiologyCenter for Excellence in Molecular Cell ScienceChinese Academy of SciencesShanghai20031China

In a recent study published in Nature,Zhang et *** the nutrient competition between cancer cells as well as their competition with macrophages during cancer development.1 Their data demonstrated that tumor-associated macrophage(TAM)can be dietarily or genetically reprogrammed to win in the competition with MYC-overexpressing cancer cells,providing new insights into our understanding of tumor development and immunotherapy.

关键词： cancer malignant

Investigation on Metallurgical Factors Controlling Charpy Impact Toughness in 1Cr21Ni5Ti Duplex Stainless Steel

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

Journal of Iron and Steel Research International 2009年第2期16卷 73-79页

作者： yaNG Zhuo-yue su Jie WANG ya-ming Institute of Structure Materials Central Iron and Steel Research Institute Beijing 100081 China Steel Tube Department China Iron and Steel Research Institute Group Beijing 100081 China

Based on the fact that toughness degradation occurred in 1Cr21Ni5Ti duplex stainless steel during slow cooling in a temperature interval of 400-600 ℃ following brazed welding, a simulated embrittlement treatment was utilized to evaluate its emhrittlement tendency. Accumulated experiences have shown that high Ti and A1 contents led frequently to severe toughness deterioration. To elucidate this phenomenon, four heats with various Ti and Al contents were prepared in laboratory-scale melts, which were used to investigate the inherent embrittlement nature. The results have shown that 550 ℃ aging led only to a modest toughness reduction, whereas, aging around 475 ℃ resulted in ferrite embrittlement, regardless of Ti, A1 levels. However, high Ti, A1 levels reduced the austenite phase, which, in the case of its inferior shape and distribution due to insufficient hot deformation, failed to resist cleavagetype cracks initiated in the ferrite phase. Increasing hot-forged areas reduction could modify the shape and distribution of austenite, resulting in the enhanced resistance of the austenite to the cleavage-type cracks, which have been confirmed to be beneficial for brittlement suppression of 1Cr21Ni5Ti duplex stainless steel.

关键词： 1Cr21Ni5Ti steel emhrittlement Ti content AI content impact toughness

Crystal microstructure, infrared absorption, and microwave electromagnetic properties of (La_(1-x)Dy_x)_(2/3)Sr_(1/3)MnO_3

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2009年第5期28卷 494-499页

作者： LIU jian YUN Guohong su Meiling Department of Physics Inner Mongolia University Hohhot 010021 China

The manganite perovskite polycrystal samples of （La1-xDyx）2/3Sr1/3MnO3 （x = 0, 0.1, 0.2, 0.35, and 0.5） doped with Dy were prepared by solid state reaction in atmosphere to measure their X-ray diffraction （XRD） patterns, scanning electric microscope （SEM） images, infrared absorption spectra, and microwave electromagnetic properties. The displacement of the XRD peaks of the samples was found, and the 2θ increases from 0.05o to 0.5o. The grains of undoped La2/3Sr1/3MnO3 not only have the greatest size, but also the most regular shape. The size of the grains decreases as the Dy doping content increases from 0 to 0.5. The infrared absorption spectra of all samples were measured at room temperature. An absorption peak corresponding to the stretching vibration mode of Mn-O bonds appears within the range of 591-629 cm-1. The absorption peak shifts from a higher frequency to a lower one with the decrease of the average ionic radius of A-site. The frequency de- pendence of microwave-absorbing properties, imaginary components of the complex magnetic permeability μ＂ and dielectric permeability ε＂ for all samples was measured at room temperature from 8 to 13 GHz. The results show that the loss of microwave absorption can be attrib- uted to both the magnetic and electric losses. The increase of Dy content not only enhances the microwave absorption but also causes the displacement of the absorption peaks.

关键词： manganite crystal microstructure infrared absorption spectrum microwave electromagnetic property doping rare earth

Bending fatigue behavior of thin Zr_(61)Ti_(2)Cu_(25)Al_(12)bulk metallic glass beams for compliant mechanisms application

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30期89卷 1-15页

作者： Diao-Feng Li ya-Long yang Yong Shen jian Xu Institute of Metal Research Chinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

In this work,bending fatigue behavior of thinner Zr_(61)Ti_(2)Cu_(25)Al_(12)(ZT1)BMG beams with thicknesses of 500μm and 100μm were investigated with three-point bending(3PB),to evaluate the reliability and safety of this potentially material used in compliant mechanisms under cyclic bending *** endurance limits(FELs)of ZT1 beams with thicknesses of 500μm and 100μm were determined to be 470 MPa,and~0.3 of its tensile *** life and FEL of ZT1 beams in bending are substantially independent of the beam thickness,in the scale from 500μm down to 100μ*** cracks of all ZT1 beams initiated at the extrinsic microvoids,either indirectly derived from surface scratches during mechanical polishing or originated from as-cast ***,fatigue crack propagation behavior is highly related to the magnitude of cyclic stress *** interrupted fatigue tests,larger proportion about 60-70%of fatigue life was spent on crack propagation under high stress level,while crack initiation occupied larger proportion about 80-85%under low stress *** medium stress level of about 590 MPa almost shared the crack-initiation life and crack-propagation *** addition,there are two crack deflection mechanisms during cracks steady propagation *** mechanism is crack deflection along the interacted shear bands ahead of crack-tip,the other one is crack"jump"from one shear band to another shear band at a certain *** two mechanisms alternate dominate the crack propagation process,generating typical staircase-like crack propagation *** endurance limits of ZT1 beams in the form of either stress amplitude or strain amplitude are superior to traditional candidate materials in the field of compliant mechanisms,showing that the better reliability and larger deflection deformation can be achieved for flexible members made by ZT1 BMG even under cyclic loading.

关键词： Metallic glasses Bending fatigue Crack initiation Crack propagation Compliant mechanisms

多源数据融合的山东半岛城市群建成区时空演变

在线全文

学校读者我要写书评

暂无评论

华北理工大学学报（自然科学版） 2025年第1期47卷 62-69页

作者：刘亚静杨子健华北理工大学矿业工程学院河北唐山063210

随着城市化进程的推进,快速精准地提取城市群建成区,并深入剖析其时空特征,对未来城市的可持续发展至关重要。夜间灯光数据能够很好的对城市区域进行识别,现已广泛的用于城市建成区的提取,但是单一的灯光数据无法完全准确的对建成区进... 详细信息

随着城市化进程的推进,快速精准地提取城市群建成区,并深入剖析其时空特征,对未来城市的可持续发展至关重要。夜间灯光数据能够很好的对城市区域进行识别,现已广泛的用于城市建成区的提取,但是单一的灯光数据无法完全准确的对建成区进行提取,会导致建成区的提取误差。为了准确揭示山东半岛城市群时空演化特征和主导因素,本文运用了EVI(增强植被指数)、道路密度网和夜间灯光数据等多源数据融合的REANI指数对建成区进行提取,分析山东半岛城市群建成区的时空演变。通过REANI指数提取城市群建成区,结果表明,山东半岛城市群近从20年扩张速度和扩张强度稳步提升,形成以西部为主,东部为辅的单一扩张模式,并且城市群扩张受到经济因素最显著,社会、自然因素次之。

关键词：多源数据城市群扩张时空演变驱动力分析

Detection of gross errors using mixed integer optimization approach in process industry

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第6期8卷 904-909页

作者： MEI Cong-li su Hong-ye CHU jian National Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou 310027 China

A novel mixed integer linear programming (NMILP) model for detection of gross errors is presented in this paper. yamamura et al.(1988) designed a model for detection of gross errors and data reconciliation based on Akaike information cri- terion (AIC). But much computational cost is needed due to its combinational nature. A mixed integer linear programming (MILP) approach was performed to reduce the computational cost and enhance the robustness. But it loses the super performance of maximum likelihood estimation. To reduce the computational cost and have the merit of maximum likelihood estimation, the simultaneous data reconciliation method in an MILP framework is decomposed and replaced by an NMILP subproblem and a quadratic programming (QP) or a least squares estimation (LSE) subproblem. Simulation result of an industrial case shows the high efficiency of the method.

关键词： Data reconciliation Detection of gross errors Mixed integer linear programming (MILP) Novel MILP (NMILP) Quadratic programming (QP)

Microstructure and mechanical properties of Al-10Si alloy modified with Al-5Ti

在线全文

学校读者我要写书评

暂无评论

China Foundry 2018年第6期15卷 405-410页

作者： ya-ling Liu Chang-jun Wu Hao Tu Xiao-wang Lu jian-hua Wang Xu-ping su jiangsu Key Laboratory of Material surface Science and Technology School of Materials Science and Engineering Changzhou University National Experimental Teaching Demonstration Center of Materials Science and Engineering Changzhou University jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University

The microstructure, fracture morphology and mechanical properties of Al-10 Si alloy modified with Al-5 Ti were analyzed and tested by optical microscopy, scanning electron microscopy, and universal electronic testing machine. Compared with unmodified Al-10 Si alloy, the area fraction of α-Al phase in Al-10 Si alloy modified at 740 °C increased first and then decreased with the increase of added amounts of Al-5 Ti, and reached the maximum when the added amount of Al-5 Ti was 0.5 wt.%. When the modification temperature increased from 700 to 740 °C with Al-5 Ti being fixed at 0.5 wt.%, α-Al dendrites were refined obviously and the area fraction remarkably increased. Compared with unmodified Al-10 Si alloy, the ultimate tensile strength and elongation of the alloy modified at 740 °C with 0.5 wt.% Al-5 Ti increased by 9% and 49%, respectively. The fracture surface of modified alloy predominantly exhibited ductile fracture.

关键词： Al-10Si modification microstructure mechanical properties

Pre-detection and dual-dictionary sparse representation based face recognition algorithm in non-sufficient training samples

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2018年第1期29卷 196-202页

作者： ZHAO jian ZHANG Chao ZHANG Shunli LU Tingting su Weiwen JIA jian School of Information Science and Technology Northwest University

Face recognition based on few training samples is a challenging task. In daily applications, sufficient training samples may not be obtained and most of the gained training samples are in various illuminations and poses. Non-sufficient training samples could not effectively express various facial conditions, so the improvement of the face recognition rate under the non-sufficient training samples condition becomes a laborious mission. In our work, the facial pose pre-recognition(FPPR) model and the dualdictionary sparse representation classification(DD-SRC) are proposed for face recognition. The FPPR model is based on the facial geometric characteristic and machine learning, dividing a testing sample into full-face and profile. Different poses in a single dictionary are influenced by each other, which leads to a low face recognition rate. The DD-SRC contains two dictionaries, full-face dictionary and profile dictionary, and is able to reduce the interference. After FPPR, the sample is processed by the DD-SRC to find the most similar one in training samples. The experimental results show the performance of the proposed algorithm on olivetti research laboratory(ORL) and face recognition technology(FERET) databases, and also reflect comparisons with SRC, linear regression classification(LRC), and two-phase test sample sparse representation(TPTSSR).

关键词： face recognition facial pose pre-recognition(FPPR) dual-dictionary sparse representation method machine learning

Synthesis, crystal structure, and application of an acenaphtho[1,2-k] fluoranthene diimide derivative

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2015年第2期58卷 364-369页

作者： Lin Ding Chiyuan yang Zhongmin su jian Pei College of Chemistry and Molecular Engineering Peking University College of Chemistry Northeast Normal University

Organic electron acceptor materials play an important role in organic ***,many organic electron acceptors have been developed,in which aromatic fused-imides have proved to be a promising family of excellent electron *** report the first synthesis of a novel aromatic fused-imide,acenaphtho[1,2-k]fluoranthene diimide derivative(AFI),using lithium-halogen exchange and Diels-Alder *** construction of a large conjugated plane and the introduction of electron-withdrawing imide groups endow AFI with a low lowest unoccupied molecular orbital(LUMO)level of 3.80 e *** exhibits a regular molecular arrangement and strong - interactions in the single-crystal structure,which indicates its potential application in organic electronic *** cell devices that were fabricated using AFI as the electron acceptor and P3HT as the electron donor achieved an energy conversion efficiency of 0.33%.

关键词： acenaphtho fluoranthene diimide lithium-halogen exchange Diels-Alder reaction electron acceptor solar cell