重大突发事件下中国金融风险跨市场多周期溢出效应研究

在重大突发事件频发的背景下,从多周期角度考察中国金融风险的跨市场溢出效应,对于防范化解重大金融风险具有重要意义。采用小波多分辨分析、DY溢出指数与风险溢出网络模型,从静态和动态角度测度了重大突发事件的短期、中期、长期内我国金融市场间风险溢出的强度和方向,识别不同事件不同周期下的风险中心及演变规律。研究发现:从静态角度来看,中国金融市场平均风险溢出水平呈现随周期增加而增加的趋势,“欧债危机”时期的风险总溢出最小,市场在各个时期不同周期下的风险净溢出情况不同,净风险溢出、溢入市场不断变化;从动态角度来看,重大突发事件冲击下金融市场总体风险传染水平呈现先上升后逐渐平稳并回落的趋势,短期总溢出指数最低,中期最高,但在某些时期,短期总溢出水平可能高于中长期;不同重大突发事件、不同周期下风险的承担中心、风险在各金融市场间的传染路径均会发生变化。因此,在强化金融市场风险监管时,需要建立全流程风险防控体系以实现风险的有效处置,针对不同事件、不同周期的反应差异,实现金融风险的精准识别与重点管理。

地缘政治对我国短期跨境资本流动的影响研究

本文基于TVP-SV-VAR模型分析地缘政治风险向短期跨境资本传导的主要渠道,并利用DY溢出指数对地缘政治风险的时变溢出效应进行测度,研究地缘政治风险溢出与证券投资、直接投资、其他投资等渠道下资本流动的关联。研究表明,地缘政治风险对我国短期跨境资本流动具有时变的短期负向效应,并通过利率、汇率、资产价格等渠道向我国资本市场传递溢出效应;当地缘摩擦加剧时,政治风险会基于市场互联不断传染放大,造成直接投资、证券投资、其他投资等资本市场子市场的跨市场溢出。建议相关部门强化外部冲击的宏观审慎研判,持续完善外汇交易真实性审核和实需管理,从优化外汇储备资产多元化配置和稳慎推进债券市场开放两方面增强我国资本市场的弹性和韧性。

Gd_(2)MgTiO_(6):Dy^(3+)荧光粉的制备与发光性能研究

采用高温固相法制备出一系列Dy^(3+)掺杂双钙钛矿Gd_(2)MgTiO_(6)白色荧光粉样品,通过X射线衍射仪和荧光光谱仪对荧光粉样品的晶体结构及荧光性能进行分析和表征。结果表明:在355 nm近紫外光激发下,样品发出极强的蓝光(484 nm)和黄光(575 nm)。通过调节Dy^(3+)的浓度可以使样品发光颜色向白光区移动,因此Gd_(2)MgTiO_(6):Dy^(3+)是一种可调荧光粉。当Dy^(3+)掺杂浓度为3%时可以发出色坐标为(0.3598,0.3946)的白光。Gd_(2)MgTiO_(6)合成方法简便、组份易调控,是一种具有潜在应用价值荧光材料。

Valence electronic engineering of superhydrophilic Dy-evoked Ni-MOF outperforming RuO_(2) for highly efficient electrocatalytic oxygen evolution

Tackling the problem of poor conductivity and catalytic stability of pristine metal-organic frameworks(MOFs) is crucial to improve their oxygen evolution reaction(OER) performance.Herein,we introduce a novel strategy of dysprosium(Dy) doping,using the unique 4f orbitals of this rare earth element to enhance electrocatalytic activity of MOFs.Our method involves constructing Dy-doped Ni-MOF(Dy@Ni-MOF) nanoneedles on carbon cloth via a Dy-induced valence electronic perturbation approach.Experiments and density functional theory(DFT) calculations reveal that Dy doping can effectively modify the electronic structure of the Ni active centers and foster a strong electronic interaction between Ni and Dy.The resulting benefits include a reduced work function and a closer proximity of the d-band center to the Fermi level,which is conducive to improving electrical conductivity and promoting the adsorption of oxygen-containing intermediates.Furthermore,the Dy@Ni-MOF achieves superhydrophilicity,ensuring effective electrolyte contact and thus accelerating reaction kinetics,Ex-situ and in-situ analysis results manifest Dy_(2)O_(3)/NiOOH as the actual active species.Therefore,Dy@Ni-MOF shows impressive OER performance,significantly surpassing Ni-MOF.Besides,the overall water splitting device with Dy@NiMOF as an anode delivers a low cell voltage of 1.51 V at 10 mA cm^(-2) and demonstrates long-term stability for 100 h,positioning it as a promising substitute for precious metal catalysts.

THE INFLUENCE OF SPINNING CONDITION ON STRUCTURE & PROPERTIES OF MASS-DYED SUPERFINE PP AS-SPUN FILAMENTS

The effect of colorant additive on the rheology of PP polymer melt and the influence of spinning conditions on the crystalline and orientation structure of mass-dyed as-spun PP filament are reported. The △E~~~ value for all colored chips is higher than that of blank chip to a varying degree. The crystallinity and orientation degree of dyed PP as-spun filament decrease with increasing melt temperature, decreasing spinning speed and increasing denier per filament (dpf), while the crystallinity of dyed as-spun filament increases with the content of colorant additive as a nucleation agent.

Comparison of Seam Strength between Dyed and Un-Dyed Gabardine Apparels: A Research on Lapped &Superimposed Seam

Today is the golden age of fashion. Fashion garments and apparels have been used everywhere to cope with the fashion era. These fashion garments and apparels are made of the fabrics of various structures and components through various processes. Among them gabardine is one of the most remarkable type of fabric and apparel dyeing is the latest process used for fashion apparel. From this research, the seam strength variations between dyed and un-dyed gabardine apparels after conceding the garment dyeing process can be known. It is a comparative research work which will deliver very effective knowledge about various types of seam, seam strength and seam performance. For comparative study, many dummy apparels body have been produced as samples which are dyed in Hams washing and dyeing limited. After that all samples have tested in Thermax woven dyeing laboratory. Since Bangladesh is a very potential fashion market and the fashion garments are being manufactured more and more. Hence the fashion trend is rapidly going to garments dyeing from conventional fabric/yarn dyeing processes. Gradually garments dyeing order are increasing higher to higher.

On Developing Dyed Yarn by Xiangshui Textile Mill

Dyed yarns are new products in the world. Garments made of yarn dyed fabric are unique, meeting the needs of returning to nature in the fashion world. Dyed yarns, with a high additional value and a big potential market, are made through complicated processes and stringent management.

When Polypropylene Fiber Can Be Dyed

What if polypropylene fiber can be dyed someday?That means fiber offers immense production possibilities, means manufacturers will benefit from increasing their operational effectiveness, reducing the inventory of colored yarns,means streamline production process, means……

波动溢出视角下亚洲主要经济体汇率风险的传染效应及其溯源研究

在重大事件频发与美联储持续加息的背景下,世界汇率市场频繁震荡影响着金融市场的稳定发展。基于汇率稳定在全球经济中的基石作用,探讨美联储不同加息周期里亚洲主要经济体货币汇率的波动,通过构建LASSO-VAR模型从波动溢出的角度对不同时间维度下亚洲主要经济体汇率市场汇率的波动风险传染进行研究,结果表明:从静态角度看,亚洲汇率市场中的波动率风险溢出网络呈现“高度聚类”和“地域邻近”的特点,主要经济体间的货币汇率波动存在一定的联系;从动态角度来说,美联储的加息会加剧亚洲汇率风险的跨区域传染,量化宽松政策则会缓和汇率风险传染;整体上来说人民币依然作为风险的溢入方,而风险传染的源头主要是来自发达经济体货币汇率的波动,如韩元、新加坡元、新西兰元等。

不同合成方法对LiMgPO_(4)∶Dy发光性能的影响

分别采用高温固相法和溶胶凝胶法合成了LiMgPO_(4)和LiMgPO_(4)∶Dy,通过热重-差热热分析仪、X射线衍射仪、傅里叶红外光谱仪、场发射高倍扫描电镜、紫外可见分光光度计和荧光分光光度计研究了不同合成方法对LiMgPO_(4)∶Dy晶体结构、形貌和发光性能的影响。结果表明,溶胶凝胶法的最低合成温度为750℃且晶体中几乎不存在其他晶相,而高温固相法在950℃合成的晶体中仍然存在少量Mg_(3)(PO_(4))_(2)晶相;相比于高温固相法,溶胶凝胶法合成的样品形貌比较规则;两种方法合成的样品在可见光区域光吸收能力差,而在紫外区域高温固相法合成的样品光吸收能力明显较高;高温固相法合成的LiMgPO_(4)∶Dy光学带隙范围为3.76~3.93 eV,溶胶凝胶法合成的LiMgPO_(4)∶Dy光学带隙范围为3.85~3.94 eV,合成方法对样品的光学带隙影响较小。LiMgPO_(4)∶Dy的最佳激发波长为350 nm,最强发射峰位于579 nm处,相比于高温固相法,溶胶凝胶法合成样品的发光强度更好。

我国系统性金融风险的跨市场传染效应研究

文章结合我国金融市场的特点,从市场波动状况、资产流动性状况、投资者情绪及资产泡沫化程度四个维度,选取相应的基础性指标,分别合成我国货币市场、股票市场、债券市场、外汇市场、房地产市场及银行部门的压力指数,用来测度各市场的系统性风险水平。然后运用DY溢出指数法测算各市场间的压力溢出水平及方向性溢出程度,并在此基础上构建了压力溢出网络,以分析系统性风险跨市场传染的静态和动态机制。结果显示:从静态视角看,股票市场的压力净溢出水平最高,是我国金融网络的核心;从动态视角看,我国金融市场总体的压力溢出指数呈现较为平稳的变动趋势,但重大经济金融事件会导致其发生异常波动;通过对金融市场四个异常波动时期压力溢出情况进行比较发现,网络核心会因重大经济金融事件的冲击而发生变动,并且单一市场在金融网络中的绝对核心地位出现下降。

国际油价、中美利差对我国实体经济的波动溢出——兼论我国实体部门的经济韧性

国际油价剧烈波动、中美利差扩大和收窄,均会对我国实体经济产生较大影响。本文基于外部冲击的视角,探讨了以下问题:一是利用混频DY溢出指数,研究了国际油价与中美利差对我国产出、消费、投资、贷款和进出口五个实体部门的波动溢出特征;二是基于混频因果关系验证了国际油价和中美利差存在交互作用,进而加大了对我国实体部门的冲击;三是利用线性回归探讨了波动溢出的渠道和影响因素;四是利用经济韧性思想测度了我国实体部门的经济韧性。研究结果表明:(1)国际油价和中美利差对我国实体经济部门是波动净输出方,国际油价和中美利差的剧烈波动不利于我国实体经济稳健发展。(2)国际金融危机、新冠肺炎疫情等特殊时期,国际油价和中美利差对我国实体经济的波动溢出和净溢出显著增强。其中,国际金融危机期间,国际油价的波动溢出更显著;新冠肺炎疫情期间,中美利差的波动溢出更突出。(3)国际油价和中美利差波动对我国实体经济存在非线性影响,其中油价下跌和利差收窄对实体经济的影响更显著。(4)国际油价对我国实体经济的波动溢出主要通过货币政策、物价和生产者预期渠道,中美利差对我国实体经济的波动溢出主要通过跨境资本流动、消费者预期、货币政策和汇率渠道。此外,面对国际油价和中美利差的冲击,我国实体经济的经济韧性有所增强。

Effect of high-molecular-weight glutenin subunit Dy10 on wheat dough properties and end-use quality

High-molecular-weight glutenin subunits(HMW-GSs) are the most critical grain storage proteins that determine the unique processing qualities of wheat. Although it is a part of the superior HMW-GS pair(Dx5+Dy10), the contribution of the Dy10 subunit to wheat processing quality remains unclear. In this study, we elucidated the effect of Dy10 on wheat processing quality by generating and analyzing a deletion mutant(with the Dy10-null allele), and by elucidating the changes to wheat flour following the incorporation of purified Dy10. The Dy10-null allele was transcribed normally,but the Dy10 subunit was lacking. These findings implied that the Dy10-null allele reduced the glutenin:gliadin ratio and negatively affected dough strength(i.e., Zeleny sedimentation value, gluten index, and dough development and stability times) and the bread-making quality;however, it positively affected the biscuit-making quality. The incorporation of various amounts of purified Dy10 into wheat flour had a detrimental effect on biscuit-making quality. The results of this study demonstrate that the Dy10 subunit is essential for maintaining wheat dough strength. Furthermore, the Dy10-null allele may be exploited by soft wheat breeding programs.

Improvements in mechanical, corrosion, and biocompatibility properties of Mg–Zr–Sr–Dy alloys via extrusion for biodegradable implant applications

In this study,extrusion was performed on Mg-Zr-Sr-Dy alloys for improving their mechanical,corrosion,and biocompatibility properties.Effects of extrusion and alloying elements on the microstructural characteristics,tensile and compressive strengths,corrosion behavior,and biocompatibility were investigated.The Mg-Zr-Sr-Dy alloys were composed of an α-Mg matrix containing {10■2} extension twins and secondary phases of intermetallic compounds Mg_(17)Sr_(2) and Mg_(2)Dy.Evolution of basal and rare earth(RE) textures was observed in the extruded alloys and an increase in Dy content to 2 wt.% resulted in texture randomization and strengthening of the RE component,mainly due to particle-stimulated nucleation and a change from discontinuous dynamic recrystallization to continuous dynamic recrystallization,which also led to an improved tension-compression yield asymmetry of 0.87.Extrusion of the alloys significantly enhanced their tensile and compressive properties due to improved distribution of alloying elements and formation of textures.Corrosion rates tested by hydrogen evolution testing,potentiodynamic polarization,and electrical impedance spectroscopy showed similar trends for each composition,and the lowest corrosion rate of 3.37 mmy^(-1) was observed for the Mg-1Zr-0.5Sr-1Dy in the potentiodynamic polarization testing.Dy_(2)O_(3) was observed in the inner layers of the Mg(OH)_(2) protective films,whose protective efficacy was confirmed by charge-transfer and film resistances.A comparison among the minimum CRs observed in this study and previously studied as-cast Mg-Zr-Sr-Dy and extruded Mg-Zr-Sr alloys,demonstrates that both the extrusion process and addition of Dy in Mg-Zr-Sr improved the CR.Similarly,extruded Mg-Zr-Sr-Dy alloys showed improved cell viability and adhesion of human osteoblast-like SaOS2 cells due to increased corrosion resistance and enhanced Sr distribution within the Mg matrix.

白光发射新型磷灰石结构荧光粉LiGd(SiO_(4))6O_(2):Bi^(3+),Dy^(3+)的合成及性能研究

采用高温固相法在1350℃下煅烧6 h合成了LGSO:0.04Bi^(3+),xDy^(3+)(x=0.1,0.15,0.2,0.3)荧光粉。荧光粉样品为磷灰石结构,属于六方晶系,具有P63/m空间群结构。LGSO:0.04Bi^(3+),0.15Dy^(3+)具有多个激发带,和两个发射带,峰值分别位于487 nm和576 nm左右,归因于Bi^(3+):^(1)S_(0)→^(3)P_(1)跃迁和Dy^(3+):^(4)F_(9/2)→^(6)H_(13/2)橙黄色发光。CIE坐标在(0.3345,0.3658)达到一个白光区域。综上所述,LGSO:Bi^(3+)与Dy^(3+)荧光粉在紫外激发白光LED中具有潜在的应用价值。

伪狂犬病病毒Guizhou-DY株的分离鉴定及致病性研究

通过采集疑似猪伪狂犬病流产胎儿病料，采用细胞接毒分离培养、病毒蚀斑纯化、病毒的形态结构观察、易感动物接种试验和病毒核酸鉴定分离到1株伪狂犬病病毒（PRV），命名为PRVGuizhou—DY株（GenBank登录号为JX417716）；为了摸清其理化特性，进一步对Guizhou—DY分离株进行了耐热、耐酸及脂溶性敏感性试验、核酸类型鉴定及病毒毒价测定，同时进行病毒致病性试验。分离鉴定结果表明：病料接种Vero细胞盲传至第2代时产生明显CPE，盲传至第4代可出现稳定的CPE；病毒粒子在电镜下呈椭圆形、有囊膜、直径为120～180nm，核内可见呈晶格状排列的病毒包涵体；病毒悬液接种家兔能引起家兔奇痒、麻痹死亡；理化特性研究表明：该病毒是一种耐热不耐酸且对氯仿敏感的DNA病毒，gE全基因序列与PRVGZ—Z1株、Fa株及Ea株的相似性分别为97．60A、98．9％和99．4％，其TCID50为10-9.71·100μL-1，PFu为109·mL-1. 攻毒组猪体温升高，临床症状较为明显，在攻毒后第5天开始出现中和抗体，第21天达到最高。该研究可为PRV病原学研究提供参考。

2个新Y-STR基因座的序列分析和在广东汉族群体中的多态性研究

分析了Y染色体2个新STR基因座DYS522和DYS527的序列结构及其在151例广东汉族男性无关个体中的遗传多态性。结果显示,DYS522基因座为单拷贝,核心序列gata,观察到重复数目为9-13次。DYS527基因座有双拷贝,每一个拷贝的序列结构有6个稳定的重复序列和2个数目变异的重复序列,如(GGAA)3…(GGAA)2…(GGAA)2…(GGAA)3…(GGAA)4…(GGAA)3…(GAAA)m(GGAA)n。在广东汉族男性群体中观察到2个数目变异的核心序列重复总数目(m+n)为18～26次。还发现1个稀有的拷贝“15．3”。在广东汉族男性群体中,2个基因座所组成的单倍型有63种,出现最多的单倍型为11/21-22,频率为0．0728,仅出现1次的单倍型有29种,频率为0．0066。本系统单倍型多样性(HD)为0．9780,个体识别力(DP)达0．9715。在38对父子遗传中未发现DYS522和DYS527基因座发生变异。这2个Y-STR具有种属差异,能够区分“男人”和“非人”雄性动物。因此,DYS522和DYS527基因座具有高度的多态性,适用于法医学实践和人类进化的研究。

对法医学相关的DYS549、DYS527和DYS459基因座在男性不育症人群中的缺失、重复调查

位于Y染色体无精症因子区域(Azoospermia factor,AZF)的基因座位点DYS549、DYS527和DYS459在法医学鉴定和家系分析中被广泛应用。但是,在男性不育患者中,DYS549、DYS527和DYS459位点很可能会表现出特殊的基因型,对应用Y染色体短串联重复序列(Y chromosome short tandem repeat,Y-STR)进行个体识别的结果产生干扰。因此,文章应用14个Y-STR基因座复合扩增体系和Y染色体AZFc区DAZ、CDY1基因的拷贝数检测等方法,探讨男性不育症中法医学相关的3个Y-STR基因座的异常分型,对个体识别和家系分析中的DNA检验异常结果提供合理的解释。在240例男性非梗阻性无精、严重少精、先天性双侧输精管缺如(CBVAD)患者中,采用改良的多重PCR体系进行AZF区域微缺失的序列标签位点(Sequence tagged sites,STSs)检测,发现AZF微缺失40例(AZFa:2例;AZFb:2例;AZFc:30例;AZFb+c:6例),AZF的总缺失率为16.67%。应用14 Y-STR复合扩增体系对上述AZF微缺失的阳性患者样本进行检测,发现所有AZFb缺失患者存在DYS549等位基因缺失,AZFc缺失患者存在DYS527、DYS459等位基因缺失,AZFb+c缺失患者存在DYS549、DYS527和DYS459等位基因缺失。在AZF微缺失阴性的不育症患者中,通过检测DAZ、CDY1基因拷贝数发现10例AZFc部分复制的患者(1例为先天性输精管缺如,2例非梗阻性无精症,7例严重少精子症),占所调查不育人群的4.17%。男性不育人群AZF区域3个Y-STR基因座多态性会造成等位基因缺失或者重复,这些异常分型是由于临床遗传缺陷造成的而不是实验偏差。阐明Y-STR在男性不育人群中的异质性可以更好地完善Y-STR数据库和解释STR实验结果。

有机硼交联剂DY2—1的改性研究与应用

在川西致密碎屑岩气藏整体压裂开发中,有机硼交联压裂液体系获得了广泛应用,但原有的有机硼 交联剂DY2-1性能不很稳定,易出现低温结晶或沉淀物,影响了压裂液交联效果。文章从有机硼交联剂改性的理 论分析入手,详细分析了硼砂、硼酸的水解反应特性和络合性质,并以提高有机硼交联剂合成反应的彻底性和性能 稳定性为目标,对合成工艺进行了优化改进,改变了传统的“在同一合成反应中不能既加酸又加碱作助剂”的思维 定式,在合成的不同反应阶段分别加入酸、碱助剂,最后得到改进的有机硼交联剂DY2—1。改性后的DY2—1凝固 点为-10℃,其低温稳定性得到显著改善。现场应用表明这种交联剂性能优良,值得进一步推广应用。

中国海南岛三个黎族支系DYS287、DYS19的多态性研究

以中国海南岛(289例)本地黎(97例)、杞黎(96例)和黎(96例)人群为研究对象,采用PCR技术及变性聚丙烯酰胺凝胶电泳方法分析了Y染色体特异性微卫星DYS19的等位基因分布规律。本地黎群体检出4种等位基因,杞黎和黎群体均检出3种。在3个支系的等位基因中均以194bp的频率为最高,分别是0.711、0.855和0.667。杞黎与黎人群DYS19基因座的等位基因频率有极显著差异(P<0.01)。我们还通过PCR方法调查了3个黎族支系的Alu序列插入基因座DYS287的多态性,结果显示:3个人群均未发生Alu序列插入。