不同产地皱盖疣柄牛肝菌中矿质元素 含量测定及特征分析

采用微波消解-电感耦合等离子体发射光谱法测定5 个产地皱盖疣柄牛肝菌中10 种矿质元素含量,并用SPSS软件进行方差分析和主成分分析。结果显示：该方法标准物质（GBW 07605）回收率在91%～101%之间,检出限在0.000 1～0.616 5 mg/kg范围,表明该方法准确、可靠;皱盖疣柄牛肝菌中Mg、Cu、Ca、Na、Zn等矿质元素的含量较高,不同产地皱盖疣柄牛肝菌中矿质元素含量具有差异;主成分分析的前3 个主成分累积贡献率达到87.87%,能表达大部分信息,主成分综合得分可以反映出不同产地皱盖疣柄牛肝菌对10 种矿质元素的富集情况。     

紫外光谱结合欧氏距离和主成分分析法快速鉴别牛肝菌

采用紫外光谱技术建立快速鉴别不同产地、种类食用牛肝菌的方法。通过确定最佳提取试剂（0.5 mol/LNaOH溶液）,最适称样量（0.100 0 g）和最佳提取时间（40 min）,制备牛肝菌样品测试液;采用夹角余弦、欧氏距离和主成分分析法对牛肝菌样品的指纹图谱进行相似度比较。结果表明,牛肝菌样品NaOH提取液在10 h内稳定性相对标准偏差（relative standard deviation,RSD）在0.06%～2.33%之间,重复性RSD在0.09%～1.81%之间,精密度RSD在0.11%～1.92%之间。样品间的夹角余弦值最大为0.999、最小为0.823,夹角余弦值相差较小,不适于鉴别牛肝菌。欧氏距离最大值为873.17,最小值为31.36,样品间距离差异明显;主成分分析的前3 个主成分累积贡献率达到93.626%,能够反映样品的主要信息,说明欧氏距离和主成分分析法可用于不同产地、种类牛肝菌的快速鉴别和质量控制。     

基于ARM的嵌入式智能视频监控系统设计

针对传统PC远程监控系统的一些不足,提出了一种前端具有预处理功能的嵌入式智能视频监控系统设计方案,通过测试,该系统视频目标检测精度较高,能够满足实时监控及智能检测需求,实现了预期设计要求。     

Bifurcation and oscillatory dynamics of delayed CDK1‐APC feedback loop

Extensive experimental evidence has been demonstrated that the dynamics of CDK1‐APC feedback loop play crucial roles in regulating cell cycle processes, but the dynamical mechanisms underlying the regulation of this loop are still not completely understood. Here, the authors systematically investigated the stability and bifurcation criteria for a delayed CDK1‐APC feedback loop. They showed that the maximum reaction rate of CDK1 inactivation by APC can drive sustained oscillations of CDK1 activity (CDK1∗ ) and APC activity (APC∗ ), and the amplitude of these oscillations is increasing with the increase of the reaction rate over a wide range; a certain range of the self‐activation rate for CDK1 is also significant for generating these oscillations, for too high or too low rates the oscillations cannot be generated. Moreover, they derived the sufficient conditions to determine the stability and Hopf bifurcations, and found that the sum of time delays required for activating CDK1 and APC can induce CDK1∗ and APC∗ to be oscillatory, even when the CDK1∗ and APC∗ settle in a definite stable steady state. Furthermore, they presented an explicit algorithm for the properties of periodic oscillations. Finally, numerical simulations have been presented to justify the validity of theoretical analysis.Inspec keywords: feedback, numerical analysis, cellular biophysics, bifurcation, delaysOther keywords: $APC^\ast $APC, activating CDK1, $CDK1^\ast $CDK1, delayed CDK1‐APC feedback loop, CDK1‐APC feedback loop play crucial roles, CDK1 inactivation, CDK1 activity     

一种新的基于并行分段裁剪的DTW算法

通过对DTW算法的研究,提出了一种并行分段裁剪的新方法,在减少DTW算法运算量方面有显著效果,并将其用于一个地名识别系统中,经测试,可以明显缩短识别时间,具有很强的实时性,有较高的识别率,适合作为小型语音识别产品的主要算法。     

信息科学与矿产预测

矿产预测实质上就是对成矿系统演化过程精确性表达的探索。面对时代发展的挑战,矿产预 测将从过去以分析为主转变为以分析与信息综合相结合。一方面,人们将继续采用新的实验技术去了 解地层、构造等因素的控矿机理。另一方面,现代信息科学的发展为理解成矿系统的非线性特性以及信 息运动过程提供了必要的理论基础,虚拟现实技术的出现,为定量研究成矿系统各要素间相互作用提供 了新的技术支持,为高精度成矿预测综合信息模型的建立创造条件。     

Metal-organic frameworks as highly efficient electrodes for long cycling stability supercapacitors

Among a large variety of energy storage technologies, supercapacitors possess special advantages such as rapid charge/discharge, high power density, safety, and environmental friendliness to meet the requirement of specific applications. The common electrode materials of supercapacitors, including porous carbon, conductive polymers, and metal oxides/hydroxides, have their own benefits and drawbacks in energy density and stability. Owing to the big surface area and controllable porosity, the metal-organic frameworks (MOFs) have been explored as important candidates for supercapacitor applications. This mini-review focuses on the recent advances of MOF-based materials including pristine MOFs, MOFs composite materials, and MOF-derived materials in the development of long cycling life supercapacitors. The devices discussed here mean those with capacitive retention rates of more than 90% after 10,000 cycles and high energy density. In addition, we also describe the fundamental knowledge of supercapacitors, highlight the stabilization mechanism of MOFs, and propose the strategies to enhance the stability of MOF-based supercapacitor electrodes.     

溶剂萃取分离钯研究进展

溶剂萃取法是分离富集贵金属有效方法，近年来国内外展开了许多研究报道，本文对溶剂萃取分离钯的研究进展进行综述，主要从传统含硫萃取剂、喹啉、肟类萃取剂、含磷萃取剂、含氮萃取剂以及新型“绿色溶剂”离子液体和疏水低共熔溶剂等几个方面进行了综述，重点介绍近年合成的新型萃取剂对钯的萃取进展，并对一些新的方法做了评述以及在溶剂萃取分离钯的应用方面做了展望。     

Preoperative evaluation of tavi for aortic stenosis based on embedded system and dual-source CT large-pitch scanning

Trans Aortic Valve Implantation (TAVI) catheter veins in the upper bit of the legs and chest by embedding a catheter; it consolidates the aortic valve. By then, coordinate the catheter, which is used to ensure the replacement valve on top of the old. Reachability before CT imaging of the third through the aortic valve implanted in the (Dual-Source Computed Tomography) DSCT scanner age wide-show TAVI method is used to evaluate the precision of the image quality and contrast decline volume show. Computed Tomography (CT ) scanner called the wide show, and TAVI appraisal of the total amount of contrast pro channel shows and 50 ml. A visual score of 4 centers (4–1) will be used to survey the image's idea. Distinction decreasing worth and Contrast-To-Noise Ratio (CNR) is the aortic root, climbing/plunging aorta is assessed in the aorta of unusual levels, it has left the right level and femoral flexibly course. To evaluate the coronary passageway tree, it is differentiated and coronary angiography. Assessments of the aortic valve annulus, to break down, is the result of the latest frameworks. Creatinine of the patient is checked at design; it chipped away at the following 72 h.     

不同套袋方式对石榴果实品质及安全性的影响

以陕西临潼石榴为研究对象,研究套袋方式（纸袋、膜袋）对石榴生长规律、石榴品质及安全性的影响.结果表明,套袋栽培技术能明显改善石榴果实的色泽及光滑度,减少裂果率,增加单果重量;套袋石榴果实中还原糖含量明显低于对照组（未套袋）石榴果实,而可滴定酸含量略高于对照组果实;套袋石榴果实中重金属（Pb、As、Hg）含量、农药残留量（氯氰聚酯）明显低于对照组（未套袋）石榴果实.石榴套袋栽培技术是生产优质石榴,提高石榴生产效益的重要措施.