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Far-field super-resolution chemical microscopy

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Light(Science & Applications) 2023年第7期12卷 1246-1267页

作者： Mingwei Tang Yubing Han Danchen jia qing Yang ji-Xin Cheng State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Intelligent perception Research Institute Zhejiang LabHangzhou 311100China Department of Biomedical Engineering Department of Electrical and Computer EngineeringPhotonics CenterBoston UniversityBostonMA 02459USA

Far-feld chemical microscopy providing molecular electronic or vibrational fingerprint information opens a new window for the study of three-dimensional biological,material,and chemical *** microscopy provides a nondestructive way of chemical identification without exterior ***,the diffraction limit of optics hindered it from discovering more details under the resolution *** development of super-resolution techniques gives enlightenment to open this door behind far-field chemical ***,we review recent advances that have pushed the boundary of far-field chemical microscopy in terms of spatial *** further highlight applications in biomedical research,material characterization,environmental study,cultural heritage conservation,and integrated chip inspection.

关键词： chemical details optics

A Common Generalization to Theorems on Set Systems with L-intersections

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Acta Mathematica Sinica,English Series 2018年第7期34卷 1087-1100页

作者： jiu qiang LIU Sheng Gui ZHANG ji Meng XIAO School of Management Engineering Xi'an University of Finance and Economics Xi'an 710100 P. R. China Department of Mathematics Eastern Michigan University Ypsilanti MI 48197 USA Department of Mathematics Northwestern Polytechnical University Xi'an 710072 P. R. China

In this paper, we provide a common generalization to the well-known Erdos-Ko-Rado Theorem, Frankl-Wilson Theorem, Alon-Babai-Suzuki Theorem, and Snevily Theorem on set systems with L-intersections. As a consequence, we derive a result which strengthens substantially the well- known theorem on set systems with k-wise E-intersections by Furedi and Sudakov [J. Combin. Theory, Set. A, 105, 143-159 （2004）]. We will also derive similar results on E-intersecting families of subspaces of an n-dimensional vector space over a finite field Fq, where q is a prime power.

关键词： Alon-Babai-Suzuki Theorem Erdos-Ko-Rado Theorem Frankl-Wilson Theorem Snevily Theorem multilinear polynomials

ON RUBIN'S HARMONIC ANALYSIS AND ITS RELATED pOSITIVE DEFINITE FUNCTIONS

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Acta Mathematica Scientia 2012年第5期32卷 1851-1874页

作者： Nji Bettaibi Kamel Mezlini Moufida El Gunichi College of Science Qassim UniversityBuridaKingdom of Saudi Arabia Institute Suprieur des Sciences Appliques et de la Technologie de Mateur Route de TabarkaMateur7030Tunisia Facult des Sciences de Tunis Campus Universitaire TunisEl Manar2092 TunisTunisia

In this paper,a new formulation of the Rubin’s q-translation is given,which leads to a reliable q-harmonic ***,related q-positive definite functions are introduced and studied,and a Bochner’s theorem is proved.

关键词： q-harmonic analysis definite positive function Bochner theorem

DNA methylation assay for colorectal carcinoma

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Cancer Biology & Medicine 2017年第1期14卷 42-49页

作者： ji-Jun Chen Ai-qin Wang qing-qi Chen Research&Development Allonger LLCColumbia 22045MDUSA Mei Chen Biotechnology Co.Ltd. Qingdao 266012China The Affiliated Hospital of qingdao University Qingdao 266003China

Colorectal carcinoma(CRC) is a common cause of morbidity and mortality worldwide. Two pathogenic pathways are involved in the development of adenoma to CRC. The first pathway involves ApC/β-catenin characterized by chromosomal instability resulting in the accumulation of mutations. The second pathway is characterized by lesions in DNA mismatch repair *** DNA methylation in selected gene promoters has emerged as a new epigenetic pathway in CRC development. CRC screening is the most efficient strategy to reduce death. Specific DNA methylation events occur in multistep *** gene silencing is a causative factor of CRC development. DNA methylations have been extensively examined in stool from CRC and precursor lesions. Many methylated genes have been described in CRC and adenoma, although no definite DNA methylation biomarkers panel has been established. Multiple DNA methylation biomarkers, including secreted frizzled-related protein 2, secreted frizzled-related protein 1, tissue factor pathway inhibitor 2, vimentin, and methylguanine DNA methyltransferase, have been further investigated, and observations have revealed that DNA methylation biomarkers exhibit with high sensitivity and specificity. These markers may also be used to diagnose CRC and adenoma in early stages. Real time polymerase chain reaction(q pCR) is sensitive, scalable, specific, reliable, time saving, and cost effective. Stool exfoliated markers provide advantages, including sensitivity and specificity. A stool q pCR methylation test may also be an enhanced tool for CRC and adenoma screening.

关键词： Biomarker colorectal carcinoma DNA methylation real time pCR stool

Automorphisms of Extensions of q by a Direct Sum of Finitely Many Copies of q

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Acta Mathematica Sinica,English Series 2019年第2期35卷 204-212页

作者： He Guo LIU Yu Lei WANG ji ping ZHANG Department of Mathematics Hubei University Department of Mathematics He'nan University of Technology The School of Mathematical Sciences Peking University

Let G be an extension of q by a direct sum of r copies of q.(1) If G is abelian, then G is a direct sum of r + 1 copies of q and Aut G = GL(r + 1, q);(2) If G is non-abelian, then G is a direct product of an extraspecial q-group E and m copies of q, where E/ζ E is a linear space over q with dimension 2 n and m + 2 n = r. Furthermore, let Aut_G'G be the normal subgroup of Aut G consisting of all elements of Aut G which act trivially on the derived subgroup G of G, and Aut_(G/ζG),_(ζG)G be the normal subgroup of Aut G consisting of all central automorphisms of G which also act trivially on the center ζ G of G. Then(i) The extension 1→ Aut_(G')G→ Aut G→ Aut G'→ 1 is split;(ii)Aut_(G')G/Aut_(G/ζG),_(ζG)G = Sp(2 n, q) ×(GL(m, q) q^(m));(iii) Aut_(G/ζG),ζGG/Inn G= q^(2 nm).

关键词： Extraspecial q-group group extension symplectic group automorphism group

A Classification of Spectrum-determined Circulant Digraphs

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Acta Mathematicae Applicatae Sinica 2018年第4期34卷 703-709页

作者： Zheng-xin qIN ji-xiang MENG qiong-xiang HUANG School of Mathematics and Information Technology Jiangsu Second Normal University Nanjing 210013 China Department of Mathematics Xinjiang University Urumuqi 830054 China

Some researchers have proved that Adam＇s conjecture is wrong. However, under special conditions,it is right. Let Zn be a cyclic group of order n and Cn（S） be the circulant digraph of Zn with respect to S？Zn／q. In the literature, some people have used a spectral method to solve the isomorphism for the circulants of prime-power order. In this paper, we also use the spectral method to characterize the circulants of order paqbωc（where p,q and ω are all distinct primes）, and to make Adam＇s conjecture right.

关键词： Circulant digraph Isomorphism Spectrum Cyclotomic polynomial

Design and simulation of a tuning fork micromachined gyroscope with slide film damping

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光学精密工程 2005年第5期13卷 519-524页

作者： CHE Lu-feng XIONG Bin jiAO ji-wei WANG Yue-lin State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China

A novel tuning fork micromachined gyroscope, based on slide-film damping, is presented. The electrostatic driving gyroscope consists of two driving masses each of which supports one sensitive mass. The angular rate is sensed by the differential capacitances consisted of movable bar electrodes and fixed bar electrodes located on the glass wafer. The gyroscope can operate at atmospheric pressure with slide film damping in the driving and sensing directions, eliminate vacuum packaging and restrain cross-axis acceleration signal. The results of design and simulation show that the driving and sensing mode frequencies are 3 106 Hz and 3 175 Hz,respectively, and the q-values in driving and sensitive modes are 1 721 and 1 450 respectively. The design resolution is 0.025°/s.

关键词：等效电路模拟角度传感器微电子力学系统电路等效方程

A novel method for telescope polarization modeling based on an artificial neural network

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Research in Astronomy and Astrophysics 2021年第7期21卷 41-50页

作者： jian-Guo peng Shu Yuan Kai-Fan ji Zhi Xu Yunnan Observatories Chinese Academy of SciencesKunming 650216China University of Chinese Academy of Sciences Beijing 100049China

The polarization characteristics of an astronomical telescope is an important factor that affects polarimetry accuracy. polarization modeling is an essential means to achieve high precision and efficient polarization measurement of the telescope, especially for the alt-azimuth mount telescope. At present, the polarization model for the telescope(i.e., the physical parametric model) is mainly constructed using the polarization parameters of each optical element. In this paper, an artificial neural network(ANN) is used to model the polarization characteristics of the telescope. The ANN model between the physical parametric model residual and the pointing direction of the telescope is obtained, which reduces the model deviation caused by the incompleteness of the physical parametric model. Compared with the physical parametric model, the model fitting and predictive accuracy of the New Vacuum Solar Telescope(NVST) is improved after adopting the ANN model. After using the ANN model, the polarization cross-talk from I to q, U, and V can be reduced from 0.011 to 0.007, and the crosstalk among q, U, and V can be reduced from 0.047 to 0.020, which effectively improves the polarization measurement accuracy of the telescope.

关键词： techniques:polarimetric telescopes polarization instrumentation:polarimeters

preparation of a novel ultra-high strength Al–Si–Cu–Ni alloy at room/elevated temperature by squeeze casting combined with a new heat treatment process

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progress in Natural Science:Materials International 2024年第4期34卷 690-701页

作者： Shulin Lü Shilong Li Zhaoxiang Yan Shusen Wu jianyu Li Xiaoyuan ji State Key Lab of Materials processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology

In this paper, the microstructure evolution and properties of squeeze-cast Al–8Si-1.5Cu–1Ni-0.5Mg-0.5Mn-0.2V-0.2Ti-0.2Zr alloy（hereafter, Al–Si–Cu–Ni alloy for short） were investigated under various solution processes,evaluating the mechanical properties at room and elevated temperatures for both as-cast and T6-treated *** results showed that following the optimal two-stage solution（i.e., solution at 510°C for 6 h + solution at 530°C for 8 h） and subsequent aging at 190°C for 10 h, referred to as the S530-T6 treatment, the Al–Si–Cu–Ni alloy exhibited excellent room/high temperature performance. The ultimate tensile strength（UTS）, yield strength（YS）and elongation of the alloy at room temperature were 410 Mpa, 368 Mpa and 1.5 %, and the UTS, YS and elongation of alloy at 300°C were 177 Mpa, 170 Mpa and 6 %, respectively. The increase in strength at room temperature is mainly attributed to the spheroidization of eutectic silicon and the precipitate strengthening aroused from uniformly dispersed nano-sized q-Al4Cu2Mg8Si7, σ-Al5Cu6Mg2and θ'-Al2Cu phases, while the increase in strength at high temperature is due to the formation of heat-resistant Ni-rich phases and the improvement of the micromorphology of high melting point intermetallic compounds.

关键词： Al-Si-Cu-Ni alloy Heat treatment Microstructure Squeeze casting Ultra-high strength