基于函数型自适应聚类的股票收益波动模式比较

股票收益波动具有典型的连续函数特征,将其纳入连续动态函数范畴分析,能够挖掘现有离散分析方法不能揭示的深层次信息。本文基于连续动态函数视角研究上证50指数样本股票收益波动的类别模式和时段特征:首先由实际离散观测数据信息自行驱动,重构隐含在其中的本征收益波动函数;进一步,利用函数型主成分正交分解收益函数波动的主趋势,在无核心信息损失的主成分降维基础上,引入自适应权重聚类分析客观划分股票收益函数波动的模式类别;最后,利用函数型方差分析检验不同类别收益函数之间波动差异的显著性和稳健性,并基于波动函数周期性时段划分、图形展示和可视化剖析每一类别收益函数在不同时段波动的势能转化规律。研究发现:上证综指股票收益波动的主导趋势可以分解为四个子模式,50只股票存在五类显著的波动模式类别,并且五类波动模式的特征差异主要体现在本次研究区间的初始阶段。本文拓展了股票收益波动模式分类和差异因素分析的研究视角,能够为金融监管部门管理策略的制定和证券市场的投资组合配置提供实证支持。国家自然科学基金“函数型数据的自适应分类预测方法及其在金融高频预测中的应用”(71701201);;教育部人文社会科学基金“金融市场的函数型数据挖掘方法与应用研究”(15YJCZH162);;2016年度全国统计科学研究项目“函数型数据自适应聚类分析的方法与应用研究”(2016LY13)的阶段性研究成果;;江苏省自然科学基金青年项目“金融高频数据的函数型自适应分类预测方法研究”(BK20170268);;中国博士后科学基金项目“函数型数据挖掘理论、方法与应用”(2015M571839);;中央高校基本科研业务费专项基金“基于函数型数据分析的大数据挖掘方法及其经济管理应用”(..

Synthesis and Characterization of Lanthanide Complexes Involving Cyclopentadienyl and N-phenylzohydroxamic Acid

合成了以茂基和 N-苯基苯甲异羟肟酸为配体的一系列新型稀土金属有机配合物 Cp2 Ln L( Cp=η5-C5H5;Ln=Sm,Nd,Gd,Dy,Ho,Er,Yb Pr;L=C6H5CONOC6H5)。产物经元素分析、IR和 MS表征A series of new mixed-ligand organolanthanide complexes involving cyclopentadienyl and N-phenylbenzohydroxamic acid ligands Cp 2LnL(Cp=η 5-C 5H 5; Ln=Nd,Sm,Gd,Dy,Ho,Er,Yb Pr; L=C 6H 5CONOC 6H 5) have been synthesized. All the complexes were characterized by elemental analysis, IR and MS spectra.安徽省自然科学基金 ( 0 0 0 46 5 0 9);; 安徽省教育厅项目基金 ( 2 0 0 0 j10 90

Transmission shielding technology for bistatic sonar

基线附近区域为双基地声呐的探测盲区,当目标位于基线区域时,目标回波与强直达波干扰同时同向到达,基于空域滤波等的传统直达波抑制方法失效。为实现双基地声呐对盲区内目标的探测,提出了一种适用于多发射阵元系统的发射声屏蔽技术。发射声屏蔽技术利用目标回波与直达波相异的多途信道结构特性,自动屏蔽在接收站位置处的直达波而不影响目标回波,且不需接收站进行任何后续处理。在已知回波信道信息时,发射声屏蔽技术可进一步实现对回波信号的聚焦,提高信干比。仿真结果表明,在不同信道条件下发射声屏蔽均能有效抑制直达波干扰。利用发射声屏蔽技术,双基地声呐能够实现对基线区内目标的检测。The area near the baseline is a dead zone for bistatic sonar.The echo and the strong direct wave will arrive in the same place simultaneously when the target is in the baseline area and the direct wave suppression method based on a spatial filter will fail.To detect targets in the dead zone,a transmission shielding method for a multi-element transmit system is proposed.The transmission shielding automatically suppresses the direct wave at the receiving station utilizing structural differences in multiple channels between the echo and the direct wave.The transmission shielding further focuses on the echo,so as to improve the Signal-Noise Ratio,using known echo channel information.The simulation results show the transmission shielding method can suppress direct wave interference for different multipath channels.Bistatic sonar can detect targets in the baseline area utilizing the transmission shielding method.国家自然科学基金资助项目(51179034); 海洋工程国家重点实验室(上海交通大学)资助项目(1211

盐生植物盐角草对中肋骨条藻的生长抑制

利用盐生植物抑制藻类生长是防治海洋赤潮发生的一种新兴技术.本文以中国近海典型赤潮原因种中肋骨条藻为对象,研究了滩涂盐生植物盐角草对藻生长的影响及其机制,并利用高效液相色谱技术分析潜在的抑藻物质.共培养实验结果显示,在营养盐充足的条件下,盐角草能够显著抑制中肋骨条藻的生长,降低藻生长水体叶绿素A(CHlA)浓度.除盐角草根系水提物之外,其余3种有机相提取物均能抑制藻的生长,改变藻细胞大小,并且影响单个细胞的CHlA含量.各种有机相提取物的抑制作用具有浓度效应,随浓度升高抑制作用增强;以甲醇相提取物效果最明显,其次是正丁醇和氯仿相提取物.经高效液相色谱分析,在甲醇相提取物中鉴定出2种黄酮化合物——芦丁和槲皮素-3-β-d-葡萄糖甙.其中芦丁对中肋骨条藻的生长具有一定的抑制作用,其抑制效果随芦丁浓度的升高而增强,随藻细胞初始接种密度的升高而减弱.结果表明,盐角草能够抑制中肋骨条藻的生长,芦丁作为盐角草的代谢产物之一有望成为新的抑藻剂.中科院知识创新重要方向项目(批准号:KSCX2-EW-J-1);国家高新技术研究发展计划(批准号:2007AA091704)资

Clinical analysis of perimenopausal women presenting initially with dry eye symptom

目的探讨围绝经期妇女的干眼症状与干眼病诊断的相关性。方法分析56例具有干眼症状的围绝经期妇女眼部检查的临床资料,观察主诉为干眼症状患者的干眼病确诊率及其关系。结果56例以干眼症状为主要表现的围绝经期妇女,确诊水液缺乏型干眼17例(30.4%),蒸发过强型干眼12例(21.4%),混合型干眼8例(14.3%);不能诊断干眼病的19例(33.9%),最终诊断为围绝经期综合征。结论围绝经期妇女干眼病确诊率较高(66.1%),但部分干眼症状可以只是围绝经期综合征的精神神经症状的一种表现,临床诊断干眼应慎重。 【英文摘要】 Objective Diagnosis and treatment of dry eye are important for improving living quality.Present paper was to investigate the correlation between dry eye manifestations and diagnosis of dry eye disease in perimenopausal women.MethodsThe clinical data of 56 perimenopausal women presenting initially with dry eye symptoms including ocular symptoms,slit-lamp examination,tear film break-up time,basal and reflex Schirmer test,vital staining(fluorescence and rose bangle),and meibomian gland dysfunction examination ..

Study on the prothymosin α as vaccine adjuvant of P.yoelii

目的:研究胸腺素α原(PrOTHyMOSInα,PrOTα)作为约氏疟原虫疫苗免疫佐剂的作用。方法:提取P.yOElII-17Xnl全蛋白作为抗原,用胸腺素α原作为免疫佐剂,免疫小鼠。具体方案为:昆明小鼠分为4组,每组6只,A组免疫P.yOElII-17Xnl全蛋白+PrOTα;b组免疫P.yOElII-17Xnl全蛋白;C组只注射PrOTα;d组为空白对照,以相同体积的生理盐水代替。免疫结束后感染致死的P.yOElII-17Xl,1x107个虫/只小鼠。结果:感染后的前10天A组小鼠疟原虫血症平均值要低于其他三组,且最终有3只小鼠存活下来,存活率50%,C组有一只小鼠存活,b、d组小鼠全部死亡。结论:用P.yOElII-17Xnl全蛋白做抗原,用PrOTα作为佐剂,比单独用P.yOElII-17Xnl全蛋白对小鼠有更好的免疫保护作用,提示了PrOTα可以成为一种有潜力的蛋白疫苗。Objective:To investigate the function of prothymosin α(ProTα) as vaccine adjuvant of P.yoelii.Methods:The mice were immunized with the total protein extracted from P.yoelii-17XNL as antigen,together with prothymosin α as adjuvant.Programs:Kunming mice were divided into A,B,C and D group.A group was immunized with P.yoelii-17XNL total protein and ProTα;B group was immunized with P.yoelii-17XNL;C group was only injected with ProTα;D group was the control,only injected with physiological saline.And then,the mice of each group was infected with P.yoelii-17XL,the dosage was 1×107/mice.Results:The parasitemia of A group-mice was lower than the other three groups in the first 10 days after infection,and eventually there were three mice survived in A group,the survival rate was 50%,one mouse survived in C group,all of mice in B group and D group died.Conclusion:Mice immunized with P.yoelii-17XNL total protein as antigen together with ProTα as adjuvants,had better immune protection than those immunized with P.yoelii-17XNL protein only.The present results suggest that the ProTα can act as a potential adjuvant in protein vaccine.厦门市科技项目(3502Z20083004);国家“973”项目(2007CB513103)资

Preliminary study on PAH degradation by bacteria from contami-nated sediments in Xiamen Western Sea, Fujian, China

In order to estimate the biodegradation of three polycyclic aromatic hydrocarbons (PAHs) compounds, bacterial strains were isolated from marine sediments in three heavily contaminated sites (Yuandang Lake, Dongdu Port and Aquacultural zones in Maluan Bay) in Xiamen Western Sea. The results show three bacterial strains, which used pyrene as the sole carbon source, were identified as strains of Aureobacterium sp., Arthrobacter sp., Rhodococcus sp. The PAH-degrading bacteria isolated had a strong ability to degrade phenan-hrene, fluoranthene and pyrene at different degradation rates. The highest degradation rate was observed when three PAH compounds were mixed with an individual strain in the medium. The three PAHs were degraded after one week with a degradation rate of 89.94 % for phenanthrene and 93.4 % for both of fluoranthene and pyrene. In addition, after 25 days of incubation, the degradation rate was 99.98 % for phenanthrene and 99.97 % for both of fluoranthene and pyrene. Optical density was measured to ..

Electrochemical Gating Single-Molecule Circuits with Parallel Paths

# These authors contributed equally to this work.电化学门控已成为一种可行且高效调节单分子电导的方法。在本研究中,我们证实了具有两个平行苯环的单分子电路中电子传输可以通过电化学门控控制。首先,我们利用STM-BJ技术以金为电极构筑了具有两条平行路径的单分子结。与单条路径的单分子结相比,两条路径的分子结由于具有增强性量子干涉效应,具有2.82倍的电导值。进一步地,我们利用电化学门控对具有两个平行苯环的单分结的电导进行调控,获得了333%·V-1调节比。结合DFT计算,发现在E=EF附近的V形透射系数谱图导致了实验观测的电导门控行为。本研究揭示了具有平行路径的单分子电路的电化学门控行为,并为设计高性能分子器件的分子材料提供了新的途径。通讯作者:周小顺E-mail:[email protected]:Xiao-ShunZhouE-mail:[email protected].浙江师范大学物理化学研究所,先进催化材料教育部重点实验室,浙江 金华 3210042.上海大学物理系,上海 2004441. Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China2. Department of Physics, Shanghai University, Shanghai 200444, Chin

The Fictive Home: An Analysis of Novel Imagery of Domestic Scenes in Pop Art(David Hockney and Tom Wesselmann)

[[abstract]]The main concern of this thesis aims at the ways how British and American pop artists express modern people’s definition and imagination of “perfect life” by sharing many common aesthetic characteristics of pop art. Using this perspective as my initial motivation of this thesis, the “domestic scenes” in pop art are made into the main subject of my discourse and the focus will be on themes of “spatiality”, which was a categorization that art critics and historians paying less attention to. Besides, I will also analyze the imageries of bodies and objects appearing in domestic spaces. In chapter one, I will explain the status, creative background and aesthetic characteristics of domestic scenes in pop art, hoping to emphasis its deep connection with the 60’ art phenomena by revealing its historical contexts. From chapter two to four, I will use spatiality, bodies and objects as three major divisions and integrate these chapters into a complete investigation of domestic scenes in pop art. In the main part of these three chapters, I will put my focus on David Hockney and Tom Wesselmann’s pictorial languages. The truth that Hockney is from Britain and Wesselmann is from USA makes them two obvious cases for my comparison between British and American pop art. Both of their works focus on domestic scenes and explore abundant imageries of bodies and objects. The purpose of my thesis is to thoroughly analyze how they keep paying attention to domestic spaces and reveal the collective desires of “dream house”, which was brought by consumerism and pervading in every corner of 60’s society. In the end of my thesis, what I want to clarify is that the long-term attentions these two artists pay to imageries of domestic scenes (both of their entire life’s works can not get rid of this categorization) can not only be attributed to the passions they hold toward painting, but also have to be completed by looking back upon the sources of pop art aesthetics. The fictive homes they made by film studio–like spaces, sexual bodies and objects implying different tastes may look like a huge screen projecting everyday life, however, it can still make people realize that the final purpose of pop art is to make them feel that they have similar fates, holding similar desires and dreams, and living in the same situations.

西北干旱区典型绿洲气候因子非线性特征研究——以新疆石河子地区为例

以西北干旱区典型绿洲新疆石河子地区为例,使用该区1959—2006年的年平均气温和降水量资料,基于小波变换从多时间尺度分析了气候因子的波动、突变和周期特性,并通过关联维数和R/S分析方法揭示了其分形与混沌特征。结果显示,石河子地区气候变化呈现复杂的非线性特征,具有分形、混沌特征和波动性。研究区降水量变化的主周期分别为5、8、14a和20a,但只有5a和8a通过了0.05水平下的显著性检验;温度变化的主周期分别在4、7a和11a,并且全部显著;研究区温度、降水量序列的关联维分别为4.51和3.21,均为非整数,这意味着该地区的气候因子具有分形和混沌特性;该区温度、降水量的饱和嵌入维分别为7和6,表明要对其进行系统动力学建模,分别需要5～7和4～6个独立的状态变量;在R/S分析中,根据研究区温度(1992—2006年)和降水量(1987—2006年)序列的Hurst指数预测,在2006年后的15a内该区温度可能仍将保持上升趋势,而降水量在未来的20a内将可能呈现轻微的下降趋势