Construction of Solidus Lines of Binary Metal Systems Having a Low Solubility of Components in the Solid Phase

The paper presents the calculation results on the construction of solidus lines of phase diagrams for some binary metal systems based on cadmium, zinc and tellurium. The investigations have been carried out using the phase equilibrium thermodynamics and known liquidus lines. By the calculation method the solidus lines of phase diagrams of the Cd-Na, Cd-Tl, Te-Ga, Te-As, Te-Cu and Zn-Sn systems were constructed in the temperature range from the base component melting point to the eutectic transformation temperature. In the Cd-Tl, Te-As, Te-Cu and Zn-Sn systems a retrograde solubility of the second component in the solid phase was observed. The temperature and maximum solubility values at the retrograde behavior of solidus lines, as well as, the limiting solubility values of components at eutectic transformation in the systems based on Cd, Zn and Te were determined.

BSN:The First Light Curve Analysis of the Total Eclipse Binary System EL Tuc

We conducted the first light curve study of the binary star EL Tuc within the Binary Systems of South and North project's framework.The photometric observations were made using standard multiband BVR_cI_c filters at an observatory in Argentina.We presented a new ephemeris for EL Tuc and a linear fit to the O–C diagram,utilizing our extracted times of minima and additional literature.We employed the PHysics Of Eclipsing BinariEs Python code and the Markov chain Monte Carlo approach for the system's light curve analysis.The target system's light curve solution required a cold starspot on the hotter component.We conclude that EL Tuc is a total contact binary system with a low mass ratio of q=0.172±0.002,an orbital inclination of i=83°.74±0°.40,and a fillout factor of f=53.7%±1.6%.We used the P-a relationship and the Gaia Data Release 3 parallax method to determine the absolute parameters of EL Tuc to compare the precision of our results.This system was classified as W-type based on the mass and effective temperature of the companion stars.The positions of the systems were depicted on the M-L,M-R,T-M,and q-Lratiodiagrams.The relationship between the spectroscopic and photometric mass ratios of binaries was discussed.

基于Adaline的双线性Hammerstein模型在线参数辨识

针对双线性Hammerstein模型,提出一种新的模型参数在线辨识方法。此辨识方法只需简单地改变模型输入,即可在线获得此类非线性模型的一致估计。首先利用伪随机二进制序列输入一致估计出模型中的双线性子系统参数,然后再借助于自适应控制中的一些方法,给模型输入连续信号,利用Adaline一致估计出静态非线性增益。此方法结构简单,计算量小,可快速推导出结果。通过理论分析和仿真研究均说明了该方法的有效性和实用性。

A catalog of early-type emission-line stars and Hα line profiles from LAMOST DR2

We present a catalog including 11 204 spectra of 10436 early-type emission-line stars from LAMOST DR2, among which 9752 early-type emission-line spectra are newly discovered. For these early- type emissionqine stars, we discuss the morphological and physical properties of their low-resolution spectra. In this spectral sample, the Hα emission profiles display a wide variety of shapes. Based on the Hα line profiles, these spectra are categorized into five distinct classes： single-peak emission, single-peak emission in absorption, double-peak emission, double-peak emission in absorption, and P-Cygni profiles. To better understand what causes the Hc~ line profiles, we divide these objects into four types from the perspective of physical classification, which include classical Be stars, Herbig Ae/Be stars, close binaries and spectra contaminated by H n regions. The majority of Herbig Ae/Be stars and classical Be stars are identified and separated using a （H-K, K-W1） color-color diagram. We also discuss 31 binary systems that are listed in the SIMBAD on-line catalog and identify 3600 spectra contaminated by HⅡ regions after cross-matching with positions in the Dubout-Crillon catalog. A statistical analysis of line profiles versus classifications is then conducted in order to understand the distribution of Hc~ profiles for each type in our sample. Finally, we also provide a table of 172 spectra with Fen emission lines and roughly calculate stellar wind velocities for seven spectra with P-Cygni profiles.

The orbital phase resolved spectroscopy of X-ray binary 4U 1822–371 with Suzaku

4U 1822-371 is a typical edge-on eclipsing low mass X-ray binary and the prototype of accre- tion disk coronal sources. We report on the results of a spectral analysis over the energy range 0.5-45 keV observed by Suzaku in 2006. We extract spectra from five orbital phases. The spectra can be equally well described by various previously proposed models： an optically thick model described by a partially cov- ered cutoff power law and an optically thin model described by a blackbody plus a cutoff power law. The optically thick model requires a covering fraction of about 55%, while the optically thin model requires a temperature of the central source of about 0.16 keV. The spectrum in the optically thick model also shows the previously detected cyclotron line feature at ~30 keV with the same Suzaku observation. This fea- ture confirms the presence of a strong magnetic field. The Fe Ks fluorescent line strengths as well as the detected Fe xxvI strengths are similar to previous Chandra and XMM-Newton detections in our phased spectral analysis; however, we also observe strong Fe xxvI during the eclipse, which indicates a slightly larger central corona.

Binary Gravitational Search based Algorithm for Optimum Siting and Sizing of DG and Shunt Capacitors in Radial Distribution Systems

This paper presents a binary gravitational search algorithm (BGSA) is applied to solve the problem of optimal allotment of DG sets and Shunt capacitors in radial distribution systems. The problem is formulated as a nonlinear constrained single-objective optimization problem where the total line loss (TLL) and the total voltage deviations (TVD) are to be minimized separately by incorporating optimal placement of DG units and shunt capacitors with constraints which include limits on voltage, sizes of installed capacitors and DG. This BGSA is applied on the balanced IEEE 10 Bus distribution network and the results are compared with conventional binary particle swarm optimization.

The 6.7 keV Line Emission from the Stellar Flare of Algol

We present spectral analysis of Algol stellar flare data. The 2-day observation of Algol in our Galaxy was done by Suzaku Satellite. Algol binary system consists of two component stars that eclipse one another periodically. The stellar magnetic field activities and Roche Lobe overflow/mass transfer mechanisms during rapid rotation of the component stars generate an X-ray emission. The variation in brightness of the stellar flare from epoch to epoch provides useful information of stellar properties of the component stars. The atomic physics of the Kα line emission process in the vicinities of chromospherically active and X-ray flare stars, and binaries is well understood. The photo ionization/collisional excitation in the Algol’s corona produces 6.7 keV line emission. The accumulated spectra in X-ray Imaging Spectrometer (XIS) sensors fitted combined with bremsstrahlung model and Gaussian line show a strong fixed X-ray energy of 6.7 keV.

On Be/X-ray binaries with an intermediate-mass black hole

We adopt the tidal truncation model proposed by Negueruela and Okazaki for Be/X-ray binaries to investigate the influence of intermediate-mass black holes （IMBHs） on Be-star disks. We show that the viscous decretion disks around Be stars are generally truncated ineffectively under the tidal force of IMBHs. Combining this with observations of Be/X-ray binaries, we suggest that Be/IMBH X-ray binaries may appear as recurrent luminous X-ray transients with quasi-periodic X-ray outbursts.

Modelling of Impedance Matching Circuit with Digital Capacitor in Narrowband Power Line Communication

Power line communication technology is used in various applications, from high voltage network to the low voltage network, as it is the only wired communication technology that is comparable with wireless communication network. It works by injecting a modulated carrier wave into the electric cables from one transceiver to another. But still, the noise level and impedance mismatch are still the main concern of this technology, particularly in the low voltage network in residential area. Power line has additive non-white noise and extremely harsh environment for communication. At the same time, there is signal attenuation along the power line caused by the impedance mismatch in the power line network. Even though these problems can be controlled using a band-pass filter and an impedance matching circuit respectively, but the impedances in the power line are time and location variant and it is rather difficult to design a circuit that allows maximum power transfer in the system all the time. Thus in this paper, a new adaptive impedance matching circuits is proposed for narrowband power line communication. This methodology is derived based on the RLC band-pass filter circuit. This concept is designed to achieve simpler configuration and higher matching resolution.

恒星光谱数据弱特征识别方法

恒星光谱弱特征识别是LAMOST光谱数据分析的重要研究内容,能够为恒星光谱分类提供重要科学依据。目前,针对恒星光谱数据进行特征识别的方法较多,但是缺乏对某种特定特征谱线进行精确提取的算法。针对LAMOST低分辨光谱数据中Hα弱发射线轮廓形态多样问题,提出了一种基于置信度的Hα弱发射线识别方法。首先,基于Hα弱发射线轮廓形态特征给出Hα弱发射线的置信度的度量方法。利用Hα发射线波长区间内峰值与发射线的偏移量建立距离置信度模型,根据高斯轮廓所含像素点个数建立高斯轮廓副信息模型,通过计算峰值左右波形的差异建立对称性评估模型,结合三个模型给出最终的Hα弱发射线的置信度,并基于此置信度进行第一轮筛选。为了提高精度,提出了借助其它发射线的特征给出了基于二分类的Hα发射线筛选策略。通过考察Hβ、NII、OIII以及SII发射线的特征,基于辅助信息的决策树进行第二轮筛选,进一步提高筛选的精度。实验结果表明:提出的Hα弱发射线的特征度量方法的准确度高达90%,并且速度较快,平均每1 k数据耗时仅三十多秒。

基于统计特征的轮胎纹理缺陷在线检测

根据轮胎X光纹理缺陷区域灰度及灰度分布异常的特点,研究了一种通过分析统计特征进行在线缺陷检测的方法。在轮胎X光纹理灰度分布模型基础上,采用正则化预处理去除背景噪声,然后进行图像分块,分别计算每块的灰度均值和方差,并采用双线性插值运算形成均值图像和方差图像,再通过二值化实现缺陷检测。实验表明,与人工检测方法进行对比,该方法误判率低,检测精度高,并且运算速度快,能满足在线检测要求。

农药二元混用对二化螟、褐飞虱和灰飞虱的综合毒力与互作效应

在直角坐标内,用两种药剂对几种害虫的LC50值作等效线,分解二元混剂的LC50值作为单剂浓度,标注在坐标内,可以清楚地反映混剂对不同兼治对象的毒力和互作效应,以此研究农药之间的二元混剂对水稻二化螟、褐飞虱和灰飞虱的兼治作用。结果表明:氟虫腈与毒死蜱(1∶15)混用对褐飞虱有增效作用,但对褐飞虱的毒力不如二化螟;吡虫啉与仲丁威(1∶9)混用对褐飞虱有增效作用,对灰飞虱有拮抗作用;吡虫啉与速灭威(1∶3)混用和噻嗪酮与吡虫啉(1∶10)混用,对两种飞虱都有增效作用;噻嗪酮与混灭威(1∶5)、甲萘威(1∶9)、毒死蜱(1∶2)和速灭威(2:1)混配,对褐飞虱有增效作用,对灰飞虱有拮抗作用;甲氨基阿维菌素苯甲酸盐与丙溴磷(1∶40)混用对褐飞虱、灰飞虱和二化螟均有增效作用,甲氨基阿维菌素苯甲酸盐与毒死蜱(1∶39)混用对二化螟有增效作用,对灰飞虱有相加作用,对褐飞虱有拮抗作用。坐标中离原点最远的混剂实测剂量能使所有兼治对象达到50%以上的死亡率,但应根据田间有害生物发生种类和药剂间的互作效应合理选择混用药剂。

基于SVM的改进二叉树输电线路故障分类器

在研究二叉树多分类的基础上,结合输电线路故障的特点,考虑不同故障的优先级后,设计了基于SVM的改进二叉树输电线路故障分类器的模型,通过实验选择了最小二乘支持向量机LS-SVM算法和线性函数转换表达式的归一化算法,并用小样本模拟短路数据训练了分类器。测试结果表明,在各种输电线路故障情况下,设计的分类器都具有很高的分类正确率,尤其是对两相接地和不接地短路分类的效果显著,另外,该分类器的数据预处理过程简单,分类步骤少,可以实现输电线路故障的快速分类。

Hough变换在农田机械视觉导航中的应用

农田机械视觉导航技术是智能化农业的一个重要方面。从农田机械视觉信息的特点出发,运用Hough变换技术来处理农田机械视觉信息,找出导航的基准线,从而实现对农田机械的导航。实验显示此方法具有算法简单、抗噪声强、软硬件要求不高等优点。

基于凸片段分解的多边形窗口线裁剪算法

将多边形窗口的边顺序地分割成一些片段，使得每个片段都能局部地形成一个凸多边形，称为凸片段，并建立一个二叉树来管理这些凸片段．在裁剪计算时，先根据二叉树快速地找到与被裁剪线段相交的凸片段，再利用高效的凸多边形线裁剪算法对这些凸片段进行裁剪操作．文中算法能有效地降低裁剪计算的时间复杂度，使其在O（logN）～O（N）之间自适应地变化，且大部分情况下时间复杂度小于O（N）．

用于在线系统的安控策略优化搜索方法

在线系统的实际应用改变了传统电力系统"离线预决策,在线匹配"的紧急控制方案潜在的控制措施过量或措施失配问题。安控策略的优化搜索是在线系统稳控计算的重要内容。提出一种基于EEAC量化分析理论和二分法搜索技术的安控策略搜索方法,其核心是基于EEAC理论并行计算计及控制空间中候选措施后,系统当前工况下的安全稳定裕度,并据此计算各措施的性能代价比。采用二分法技术搜索针对该工况的最优控制策略。基于该方法的安控策略搜索已在多个电网在线系统中得到实际应用,实例表明,该方法可极大缩短安控策略搜索耗时,提高在线系统运行效率。

一种新颖的数字识别算法

介绍了一种简易的标准数字识别的算法。与传统的数字识别方法相比较,其效率很高。该算法利用字符二值化后的图像的水平和垂直穿线等组合特征完成级联分类,用最小近邻法实现数字的识别。利用该方法时,无须对待识别字符进行规整、细化和轮廓提取处理,降低了算法复杂度,减少了因细化变形、轮廓断裂引起的误识和拒识。在以此算法为基础实现的监控信息(电厂远程数字仪表监控)自动采集与记录系统中,对5222个数字字符进行识别测试,平均每秒处理125个数字,正确识别率达到98.70%,误识率仅为1.30%。实验表明,该算法在处理速度、识别精度、抗干扰性方面表现良好。

棕榈仁油与五种油脂相容性的研究

利用等温相图，研究了棕榈仁油与5种常见人造奶油基料油——棕榈油、棕榈油硬脂、棕榈油软脂、氢化棕桐油和牛脂之间的二元相容性。结果表明，棕榈仁油与棕榈油系列油混合物在20～25℃内出现严重的共晶现象，与牛脂在10℃内出现偏晶现象，在20～25℃出现严重的共晶现象。

5种主要籼稻不育系细胞质的胞质效应研究

用龙特浦A、冈46A、Ⅱ-32A、新协黄A和粤泰A等应用于生产的5种主要类型细胞质雄性不育系及其保持系进行交叉配组,产生了20个二元系,研究了不同细胞质对二元系的育性、白叶枯病抗性、主要经济性状的影响。结果表明除了红莲型细胞质外,野败型、冈型、印尼水田谷型、矮败型的保持关系相同,不同细胞质对白叶枯病的抗性没有显著差异,对主要经济性状的影响较小,但对异交性状具有一定影响,其中影响较大的为柱头外露率和开颖角度。讨论了多样性不育细胞质利用的途径。

在线标准加入火焰原子吸收光谱法测定钮扣电池中铅和镉

应用火焰原子吸收光谱（FAAS）法测定了钮扣电池中铅和镉的含量，对测定条件作了较详细的研究。用在线双毛细管标准加入法消除了基体的干扰。按所述方法测定电池样品中铅和镉，测定结果的RSD依次为3．58％和5．87％，铅和镉的浓度水平分别为5．4×10^-3％和2．3×10^-4％（质量分数），回收率结果为93．0％-100．1％（铅）和95．0％-101．0％（镉）。