Assembly of functional carboxymethyl cellulose/polyethylene oxide/anatase TiO_(2) nanocomposites and tuning the dielectric relaxation, optical, and photoluminescence performances

Nanocomposite films consisting of carboxymethyl cellulose,polyethylene oxide(CMC/PEO),and anatase titanium diox-ide(TO)were produced by the use of sol-gel and solution casting techniques.TiO2 nanocrystals were effectively incorporated into CMC/PEO polymers,as shown by X-ray diffraction(XRD)and attenuated total reflectance fourier transform infrared(ATR-FTIR)analysis.The roughness growth is at high levels of TO nanocrystals(TO NCs),which means increasing active sites and defects in CMC/PEO.In differential scanning calorimetry(DSC)thermograms,the change in glass transition temperature(Tg)val-ues verifies that the polymer blend interacts with TO NCs.The increment proportions of TO NCs have a notable impact on the dielectric performances of the nanocomposites,as observed.The electrical properties of the CMC/PEO/TO nanocomposite undergo significant changes.The nanocomposite films exhibit a red alteration in the absorption edge as the concentration of TO NCs increases in the polymer blend.The decline in the energy gap is readily apparent as the weight percentage of TO NCs increases.The photoluminescence(PL)emission spectra indicate that the sites of the luminescence peak maximums show slight variation;peaks get wider,while their intensities decrease dramatically as the concentration of TO increases.These nanocomposite materials show potential for multifunctional applications including optoelectronics,antireflection coatings,pho-tocatalysis,light emitting diodes,and solid polymer electrolytes.

Temperature-dependent photoluminescence of lead-free cesium tin halide perovskite microplates

Tin halide perovskites recently have attracted extensive research attention due to their similar electronic and band structures but non-toxicity compared with their lead analogues. In this work, we prepare high-quality CsSnX_(3)(X=Br,I) microplates with lateral sizes of around 1–4 μm by chemical vapor deposition and investigate their low-temperature photoluminescence(PL) properties. A remarkable splitting of PL peaks of the CsSnBr_(3)microplate is observed at low temperatures. Besides the possible structural phase transition at below 70 K, the multi-peak fittings using Gauss functions and the power-dependent saturation phenomenon suggest that the PL could also be influenced by the conversion from the emission of bound excitons into free excitons. With the increase of temperature, the peak position shows a blueshift tendency for CsSnI_(3), which is governed by thermal expansion. However, the peak position of the CsSnBr3microplate exhibits a transition from redshift to blueshift at ~160 K. The full width at half maximum of CsSnX_(3)broadens with increasing temperature, and the fitting results imply that longitudinal optical phonons dominate the electron–phonon coupling and the coupling strength is much more robust in CsSnBr3than in CsSnI_(3). The PL intensity of CsSnX_(3)microplates is suppressed due to the enhanced non-radiative relaxation and exciton dissociation competing with radiative recombination. According to the Arrhenius law, the exciton binding energy of CsSnBr_(3)is ~38.4 meV, slightly smaller than that of CsSnI_(3).

Origin of Photoluminescence of Neodymium-Implanted Silicon

Neodymium is incorporated into single crystalline silicon on MEVVA (Metal Vapor Vacuum Arc) ion source.At room temperature,strong ultra violet and visible fluorescence are observed at the excitation wavelength of 220nm.Luminescence intensity increases with the increase of ion fluence.XPS results manifest that Si-O,Nd-O,Si-Si and O-O bonds exist in the implanted layers.Luminescence mainly results from the radiation transition in the intra 4f shell of Nd 3+ ion.The defects' and damages' contribution to the luminescence is also presented.

数字普惠金融赋能县域产业结构转型升级的动力机制——基于PLS-SEM模型分析

基于偏最小二乘法结构方程模型(PLS-SEM),运用河南省县域2014—2020年平衡面板数据研究数字普惠金融驱动河南省县域产业转型升级的机制与实证效果,结果表明:数字普惠金融能够推动河南省县域产业结构的转型升级;数字普惠金融主要通过经济发展、生态环境、社会共享三个方面共同推动河南省县域产业结构转型升级;从发展潜力方面看,数字普惠金融对产业结构升级有一定负相关性,可能的原因是河南省县域数字平台不够完善、数字信息技术落后,且大多以轻工业、农业为主,导致数字普惠金融的正向融入性存在延迟。必须持续推动数字普惠金融的产业融入性、夯实数字普惠金融服务实体经济的功能性,提高河南省县域产业经济韧性。

4PL供应链融资体系多方安全隐私计算的信息共享机制研究

目前4PL供应链融资业务随着技术的提升,在获取大数据信息的同时,也产生了“信息壁垒”“数据泄露”“数据权限”等信息安全共享问题。在4PL供应链融资业务中,在隐私安全的基础上提升数据资源共享。文章首先分析目前4PL供应链融资结构和要素关系及相关信息流通问题,然后从数据安全共享的层面出发,结合隐私计算的多方安全计算技术,构建了一种安全的4PL信息平台并分析其共享机制用以增加参与主体间的信任度,从而提高4PL供应链融资的效率,并且建立数据管控系统和动态协作管理架构以增强4PL企业在供应链融资中的功能。

基于PSO-PLS煤泥浮选加药量预测模型

煤泥浮选药剂添加量的精确控制对浮选效果至关重要,是智能浮选的重要因素,也是近几年浮选智能科研工作者的研究课题。药剂量添加不当会导致浮选精煤灰分存在较大波动。影响浮选药剂添加量的因素众多,本文考虑入料浓度、入料流量、补水量、精煤灰分和尾煤灰分这五种因素对煤泥浮选药剂添加量的影响,提出了一种基于粒子群优化(PSO)偏最小二乘(PLS)算法的煤泥浮选起泡剂和捕收剂加药量预测模型。通过对比PCA、PLS和PSO-PLS三种算法的预测效果,发现PSO-PLS模型在预测精度和稳健性上表现优异,均方差、均方根误差、平均绝对百分比误差显著低于前两者,捕收剂预测R2值达到0.7863,起泡剂预测R2值达到0.8320,表明其拟合效果良好。实验证明,PSO-PLS算法能够准确预测浮选药剂添加量,有助于实现选煤厂浮选加药过程的智能化,为进一步选煤厂智能化建设提供了技术支持。

基于BN和PLS-SEM的大学生网约车忠诚度研究

为分析大学生网约车乘客忠诚度及其影响因素的作用机制,将贝叶斯网络(Bayesian networks,BN)和偏最小二乘法结构方程模型(partial least squares structural equation modelling,PLS-SEM)结合,以2019年大连市大学生网约车乘客为例,分析大学生网约车乘客的负面体验、运营服务、环境满意、乘客满意度和忠诚度的关系。在BN中采用基于约束的自动学习方法学习因子间的作用关系,获得不同影响因素间相关关系的网络结构。通过PLS-SEM测试和分析BN结构,建立乘客忠诚度模型。结果表明:乘客满意度是影响忠诚度的最大因素,总效应为0.508;负面体验是影响忠诚度的最小因素,总效应为-0.146。乘客满意度是提高大学生网约车忠诚度的关键指标,网约车平台应通过优化车内环境、缩短出行时间、规范司机行为、升级应用软件等措施提升大学生的乘车体验,提高大学生网约车乘客的忠诚度。基于BN和PLS-SEM的大学生网约车忠诚度研究可丰富网约车乘客的决策行为机制与研究方法,为相关部门和网约车平台提供管理决策依据。

基于PLS-SEM的高速公路施工企业竞争文化建设路径研究

为充分挖掘高速公路施工企业竞争文化要素间的作用关系,提升高速公路施工企业竞争意识,推动交通强国战略目标实现,本文对高速公路施工企业竞争文化建设路径进行探究。利用词频-逆向文件频率(TF-IDF)算法对291家施工企业的竞争文化文本表现特征进行提取,构建个人要求、晋升激励、质量成本管理、部门管理理念、合作与竞争观念、社会责任与使命6个影响因素的高速公路施工企业竞争文化作用关系概念模型。通过偏最小二乘法结构方程模型(PLS-SEM)分析各要素间的作用关系。最后,基于竞争文化要素间的路径系数,构建激励型路径、引导型路径和反馈型路径共3种高速公路施工企业竞争文化建设路径。

Ostensibly perpetual optical data storage in glass with ultra-high stability and tailored photoluminescence

Long-term optical data storage(ODS)technology is essential to break the bottleneck of high energy consumption for information storage in the current era of big data.Here,ODS with an ultralong lifetime of 2×10^(7)years is attained with single ultrafast laser pulse induced reduction of Eu^(3+)ions and tailoring of optical properties inside the Eu-doped aluminosilicate glasses.We demonstrate that the induced local modifications in the glass can stand against the temperature of up to 970 K and strong ultraviolet light irradiation with the power density of 100 kW/cm^(2).Furthermore,the active ions of Eu^(2+)exhibit strong and broadband emission with the full width at half maximum reaching 190 nm,and the photoluminescence(PL)is flexibly tunable in the whole visible region by regulating the alkaline earth metal ions in the glasses.The developed technology and materials will be of great significance in photonic applications such as long-term ODS.

Hydrothermal Synthesis of Rhombus-like SmCO3OH Microplates and Its Photoluminescence Property Doped with Eu^3＋

Rhombus-like SmCO3OH microplates with the edge lengths ranging from 5 μm to 10 μm and the thickness about 1.5 μm were synthesized through a simple hydrothermal method using urea as the precipitance. The structure and properties of the rhombus-like SmCO3OH microplates were characterized by X-ray diffraction, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The optical property of the rhombus-like SmCO3OH microplates doped with Eu^3＋ was investigated by photoluminescence. A broad and strong emission band at 677 nm was obtained, which can be contributed to producing light conversion film.

Synthesis and Photoluminescence of New Europium Complex Eu(DBM)_3(DPPZ) with Dipyridophenazine Ligand

Dipyrido [3, 2-a:2,3-c] phenazine moiety has been introduced as neutral ligand in europium complex. Therefore, a new europium complex with saturated emission, strong fluorescent intensity and good solubility was designed and synthesized for the first time. Its photoluminescence and UV properties were examined. The experimental results showed that this new Eu-complex could be used as red electroluminescent materials.

Red Electroluminescence and Photoluminescence from Novel Binuclear Europium Complex with Squaric Acid Ligand

A novel binuclear europium P-diketone complex with squaric acid ligand was synthesized for the first time. Its structure was elucidated by IR, UV, and Elemental Analysis. Red light emitting diode (LED) was fabricated by using the novel europium complex as an emitting layer, tris(8-quinolinolate) aluminum (III) (Alq(3)) as an electron-transporting layer, N, N'-diphenyl-N, N'-(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine (TPD) as a hole-transporting layer. A cell structure of indium-tin-oxide/TPD/Eu-complex/Alq(3)/Mg: Ag was employed. Red electroluminescence was observed at room temperature with dc bias voltage of 2 V in this cell. 2 Red emission peaks at about 613 nm with maximum luminance of over 106 cd/m(2). Compared with the EL luminance from those europium complexes reported before, one from the Eu-complex is best in the same cells.

A Series of Mononuclear Complexes Constructed from Transition Metals and Amino Acid Derived Ligands: Syntheses, Structures and Photoluminescence

Eight neutral mononuclear complexes constructed from transition metals （M = Co（Ⅱ）, Ni（Ⅱ）, Cu（Ⅱ）, Zn（Ⅱ）, Cd（Ⅱ）） and ligands N-（2-pyridylmethyl）-L-phenylalanine （L-Hpmpa） and N-（2-pyridylmethyl）-L-tyrosine （L-Hpmtyr） have been synthesized by both hydrothermal and conventional room temperature reactions. Four of them have been structurally characterized by single-crystal X-ray diffractions. They are： [Co（L-pmpa）2·2H2O] 1, [Ni（L-pmpa）2·2H2O] 2, [Cu（L-pmpa）2·2H2O] 3 and [Cu（L-pmtyr）2·2H2O] 4. Single-crystal X-ray analysis, IR and elemental analysis revealed that complexes 1, 2 and 3 are isostructural. Powder X-ray diffraction, IR and elemental analysis revealed that complexes 4, 5 （Zn[L-pmtyr]2·2H2O）, 6 （Cd[L-pmtyr]2·2H2O）, 7 （Co[L-pmtyr]2·2H2O） and 8 （Ni[L-pmtyr]2·2H2O） are isostructural. The photoluminescence properties of L-Hpmtyr ligand, compounds 5 and 6 were also investigated.

Preparation, Structure, Photoluminescence and Energy Transfer Mechanism of a Novel Holmium Complex

A novel holmium complex [Ho(HIA)_2(H_2O)_4(NO_3)](NO_3)_2(1, HIA = isonicotinic acid) has been synthesized through hydrothermal reactions and characterized by single-crystal X-ray diffraction. Complex 1 crystallizes in the C2/c space group of monoclinic system: a = 14.4797(7), b = 12.4768(2), c = 13.3471(5) ?, β = 118.690(4)°, V = 2115.26(13) ?~3, C_(12)H_(16)HoN_5O_(17), Mr = 667.23, Z = 4, Dc = 2.095 g/cm^3, μ(Mo Kα) = 3.838 mm^(–1) and F(000) = 1304. The crystal structure of 1 is characterized by an isolated structure. Solid-state photoluminescence experiment uncovers that it shows yellow light emission. The emission bands are originated from the characteristic emission of the 4 f electrons intrashell transition of the ~5S_2 → ~5I_8 and ~5F_5 → ~5I_8 of the Ho^(3+) ions. Energy transfer mechanism is explained by the energy level diagram of the Ho3+ ion and the isonicotinic acid ligand. It has remarkable CIE chromaticity coordinates of(0.4929, 0.4632), so it may be a promising color converter for lighting and displays.

Pls3突变相关新型早发骨质疏松大鼠模型的心血管改变及机制

目的基于自主构建的丝束蛋白3(Plastin 3,PLS3)大片段基因Pls3敲除的新型骨质疏松大鼠模型,评估心血管表型及其与胶原代谢的关系。方法采用CRISPR/Cas9技术构建Pls3基因10~16外显子大片段敲除的大鼠模型(Pls3^(E10-16del/0)),与野生型大鼠进行心脏表型比较,采用免疫组化染色了解PLS3蛋白在心血管的表达,采用超声心动评估大鼠心血管形态及功能,HE染色了解心脏组织学改变,使用扫描电镜评估心脏胶原蛋白的微结构及排列。结果PLS3在野生型大鼠心血管组织细胞质中广泛表达,在Pls3^(E10-16del/0)大鼠心血管的表达明显减少。6~8周龄Pls3^(E10-16del/0)大鼠的心脏及大血管结构与功能未见明显异常,但与野生型大鼠相比,其存在右心室舒张末内径及近端升主动脉内径缩小,血管内皮细胞减少及排列紊乱。Pls3^(E10-16del/0)大鼠心血管组织中的胶原合成未受影响,但电镜下可见其心脏及升主动脉中的细胶原纤维断裂、排列散乱。结论本研究首次对新型Pls3基因大片段敲除的早发骨质疏松大鼠模型心血管系统进行研究,发现其右心室及升主动脉内径缩小,出现细胶原纤维断裂、排列散乱的异常改变,其对心血管系统的结构与功能的远期影响,有待观察,研究拓展了对Pls3相关骨质疏松症心血管表型的认识。

Red Mechanoluminescence and Photoluminescence from Novel Europium Complexes

Two new binuclear (europium and lanthanum) beta-diketone complexes Eu0.9La0.1(TTA)(3)Phen and Eu0.5La0.5(TTA)(3)Phen in which Phen is 1,10-phenanthroline, TTA is an anion of thenoyltrifluoroacetone (HTTA) were synthesized for the first time. They showed intense photoluminescence (PL) and mechanoluminescence (ML), and had their maximum PL and ML spectra peaked at 613.5 nm with half bandwidth of 10 nm respectively. Their PL and ML intensity were obviously stronger than these from Eu(TTA)(3)Phen. It is considered that binuclear (europium and lanthanum) beta-diketones complexes are promising ML and PL materials.

Construction and Photoluminescence Properties of Zn(Ⅱ)/Cd(Ⅱ) Complexes with 4-Amino-3,5-propyl-1,2,4-triazole Ligand

Reaction of ZnCI2 and 4-amino-3,5-propyl-1,2,4-triazole （dpatrz） or CdC12, NaN3 and dpatrz, in aqueous solution at room temperature yields two neutral clusters： a dinuclear complex [Zn2（dpatrz）2Ch] （I） and a linear trinuclear complex, [Cd3（dpatrz）4（N3）2Cl4] （II）. Both complexes have been characterized by X-ray single-crystal diffraction, powder XRD, IR, elemental analysis, TG and fluorescence analysis. Complex I crystallizes in orthorhombic, space group Pbca with a = 11.865（2）, b = 14.464（3）, c = 15.985（3） A, V= 2743.4（9） A3, Z = 4, C16H32NsCI4Zn2, Mr = 609.4, Dc = 1.475 g.cm3, p = 2.16 mm-1, F（000） = 1248, GOOF = 1.091, the final R = 0.0295 and wR = 0.0665 for 1999 observed reflections （I 〉 2a（/））. Complex Ⅱcrystallizes in monoclinic, space group P2/c with a = 11.408（2）, b = 15.211（3）, c = 18.152（6） A, fl = 123.75（2）°, V = 2619.1（1） A3, Z = 2, C32H64N22ClaCd3, Mr = 1236.05, Dc = 1.567 g.cm3, p = 1.46 mm-1, F（000） = 1244, GOOF = 1.042, the final R = 0.0444 and wR = 0.0913 for 3466 observed reflections （I 〉 2a（/））. The analysis of X-ray revealed that both structures lie about the inversion centers： complex I adopts two pl,2-triazole bridges linking two Zn（II） ions and II forms a linear trinuclear structure with four μ1,2-triazoles and two/μIA-N3 bridging modes. There are different coordinated geometries for three Cd（II） ions in Ⅱ： one is coordinated with an octahedral environment, and the other two are distorted tetragonal pyramids （r = 0.34）. The hydrogen bonds of C-H...C1 and N-H...C1 lead to the discretes into a 3D supramolecular network in both compounds. The thermal stabilities and photoluminescence behaviors of them were also studied.

Synthesis and Photoluminescence of a Novel Iridium Complex (BuPhOXD)_2Ir(acac) with Unit of 1, 3, 4-Oxadiazole

A novel cyclometalated iridium complex with 1, 3, 4-oxadiazole moiety was synthesizedand characterized. Its UV and photoluminescent properties were studied. The strong UVabsorption intensity around 462 nm attributed to spin-forbidden triplet metal–ligand charge transferband and photoluminescence at 518 nm were observed. This indicated that achieved iridiumcomplex could be used as an efficient electrophosphorescent material.

Surface plasmon enhanced photoluminescence in amorphous silicon carbide films by adjusting Ag island film sizes

Ag island films with different sizes are deposited on hydrogenated amorphous silicon carbide （a-SiC：H） films, and the influences of Ag island films on the optical properties of the tx-SiC：H films are investigated. Atomic force microscope images show that Ag nanoislands are formed after Ag coating, and the size of the Ag islands increases with increasing Ag deposition time. The extinction spectra indicate that two resonance absorption peaks which correspond to out-of-plane and in-plane surface plasmon modes of the Ag island films are obtained, and the resonance peak shifts toward longer wavelength with increasing Ag island size. The photoluminescence （PL） enhancement or quenching depends on the size of Ag islands, and PL enhancement by 1.6 times on the main PL band is obtained when the sputtering time is 10 min. Analyses show that the influence of surface plasmons on the PL of a-SiC：H is determined by the competition between the scattering and absorption of Ag islands, and PL enhancement is obtained when scattering is the main interaction between the Ag islands and incident light.

冰草1PS和1PL易位染色体导入不同小麦背景改良株型的遗传效应评价

冰草(Agropyron cristatum L.,2n=4x=28,PPPP)携带的多样性外源基因是小麦遗传改良重要基因源。前期研究表明冰草1P染色体上的基因可以改良小麦株叶型,但在获得易位系的基础上,外源片段导入不同背景小麦品种的叶型变化以及可能带来的不利遗传连锁累赘还不清楚。为进一步探究小麦-冰草T1PS·1AL和T1AS·1PL易位系在不同小麦背景中对主要农艺性状的遗传效应,本研究将小麦-冰草1PS、1PL易位系与藁城8901、百农607、漯麦163、百农207、西农979、中麦578、川麦104、宁麦资126等8个普通小麦品种进行杂交,对F2分离群体的农艺性状进行考察和分析。结果表明,冰草1PS染色体导入小麦后,降低了小麦的倒三叶长,株高也显著降低3~8 cm,产量性状基本不受影响。冰草1PL染色体使小麦株高降低,旗叶、倒二叶和倒三叶显著缩短,改变株型的同时,小麦的产量性状同时降低,具有连锁累赘。在冰草1P易位系中,后代的表型除与染色体本身所产生的效应有关外,也与小麦受体的遗传背景相关。在不同背景的小麦亲本杂交组合后代中,可以选出株叶型改良且产量性状不受影响的单株用于小麦的遗传改良。研究表明2个小麦-冰草1P易位系创新种质在株型改良上具有显著的遗传效应,可以为冰草1P染色体易位片段的利用提供指导。