Fully asynchronous stochastic coordinate descent: a tight lower bound on the parallelism achieving linear speedup

Mathematical Programming - We seek tight bounds on the viable parallelism in asynchronous implementations of coordinate descent that achieves linear speedup. We focus on asynchronous coordinate...     

n-APR tilting and $$tau $$ τ -mutations

Journal of Algebraic Combinatorics - APR tilts for path algebra kQ can be realized as the mutation of the quiver Q in $${mathbb Z}Q$$ with respect to the translation. In this paper, we show that...     

Generalized P(N)-graded Lie superalgebras

We generalize the P(N)-graded Lie superalgebras of Martinez-Zelmanov. This generalization is not so restrictive but suffcient enough so that we are able to have a classification for this generalized P(N)-graded Lie superalgebras. Our result is that the generalized P(N)-graded Lie super-algebra L is centrally isogenous to a matrix Lie superalgebra coordinated by an associative superalgebra with a super-involution. Moreover, L is P(N)-graded if and only if the coordinate algebra R is commutative and the super-involution is trivial. This recovers Martinez-Zelmanov's theorem for type P(N). We also obtain a generalization of Kac's coordinatization via Tits-Kantor-Koecher construction. Actually, the motivation of this generalization comes from the Fermionic-Bosonic module construction.     

高光谱的刺五加黑斑病的早期检测研究

对感染黑斑病的刺五加叶片进行光谱特性研究,能为药用植物病害的早期筛选与精准治疗提供重要研究资料.实验目的,运用高光谱成像技术实现植物病害的自动监督分类与识别.实验过程,首先使用高光谱成像系统在可见光波段(380～960 nm)内采集刺五加黑斑病的叶片样本,光谱数据经过去除亮暗噪声和平滑预处理后,再经过主成分分析实现数据...     

Realization of quantum correlation transfer between twin beams by conditional preparation technique

A conditional quantum correlation transfer is demonstrated experimentally for continuous variables by employing two pairs of twin-beams states. In present paper, the quantum correlation of twin beams is indicated by loss coefficient or “gemellity”, which is the remaining noise on the intensity difference normalized to the shot noise level. The quantum correlation between two initial idler beams with loss coefficient of 0.4 was conditionally transferred from two pairs of initially independent twin beams with loss coefficient of 0.2. A theory of conditional quantum correlation transfer and comparison between experimental results and theoretical prediction are also presented. The experimental results agree with the theory well.     

Influence of negative ion resputtering on Al-doped ZnO thin films prepared by mid-frequency magnetron sputtering

Al-doped ZnO (AZO) films were deposited on glass substrates by mid-frequency magnetron sputtering with a ceramic ZnO:Al₂O₃ (98 wt%:2 wt%) target. The origin of the high resistivity of the films at the substrate position facing the erosion area of the target was investigated. The results indicate a preferential resputtering of Zn atoms caused by the negative ions, which leads to an increase of the oxygen/metal ratio in the films. Then more Al oxides form and result in the decrease of Al_Zn (the main donor in the films) concentration in the films. Thus the free carrier concentration decreases badly. This is the main mechanism responsible for the high resistivity.     

哈特曼测量大气相干长度研究

研究了利用哈特曼波前传感器测量大气相干长度的两种方法：一种是测量两个子孔径恒星光波到达角起伏方差的差分像运动法;另一种是测量恒星波前分布,通过波前分布的剩余方差推算得到大气相干长度。试验测量结果表明,两种方法得到的测量结果基本一致,得到了大气相干长度的可靠数据,两种方法得到了相互验证,实现了在应用哈特曼波前传感器测量大气波前分布时,同时得到当前的大气信息,对分析哈特曼波前传感器的测量结果有参考意义。     

色谱-质谱联用技术在中药代谢组学研究中的应用

代谢组学是研究生物体被扰动后其代谢产物种类、数量及变化规律的科学,研究理念与中医药理论的整体、动态观念非常一致,目前很多工作已将代谢组学应用于中药药效物质基础、作用机制、复方及配伍规律等研究中,有望推动中医药现代化进程。色谱-质谱联用技术是代谢组学的主要分析技术平台,该文综述了近3年来色谱-质谱联用技术在中药代谢组学研究中的应用,重点介绍不同分离技术的特点及最新进展,并讨论了其存在的问题。     

Accurate frequency atlas of molecular iodine near 532 nm measured by an optical frequency comb generator

An optical frequency comb generator (OFCG) at 1064 nm with a modulation frequency of 2 GHz is developed for an accurate optical frequency link between iodine absorption lines near 532 nm. With the OFCG, we have measured frequency differences between seventeen ¹²⁷I₂ transitions with a measurement uncertainty of about 240 Hz (relatively 4.3×10⁻¹³), which is mainly contributed from the frequency repeatability of iodine-stabilized Nd:YAG lasers. The measured transitions provide an attractive frequency reference network and are excellent candidates for the practical realization of the meter.