A new method for probabilistic linguistic multi-attribute group decision making: Application to the selection of financial technologies

“No technology, no finance” has been the consensus in banking industry. Under the background of financial technology (Fintech), how to select an appropriate technology company to cooperate for the banks has become a key. The technology company selection can be regarded as a kind of multi-attribute group decision making (MAGDM) problems. The probabilistic linguistic term set (PLTS) is a useful tool to express decision makers’ (DMs’) evaluations in the technology company selection. This paper develops a new method for MAGDM with PLTSs. Firstly, the possibility degree and range value of PLTSs are defined. Then a possibility degree algorithm is designed for ranking PLTSs. An Euclidean distance measure between PLTSs is presented and extended to probabilistic linguistic matrices. Based on Archimedean t-norm and s-norm, some new operational laws for PLTSs are defined and some desirable properties are discussed. Then, a generalized probabilistic linguistic Hamacher weighted averaging (GPLHWA) operator and a generalized probabilistic linguistic Hamacher ordered weighted averaging (GPLHOWA) operator are developed. Some useful properties for these operators are investigated in detail. Combined with the subjective weights of DMs, the DMs’ weights are determined by the adjusted coefficients. Using the GPLHWA operator, the collective decision matrix is obtained by aggregating all the individual decision matrices. By maximizing the total weighted square possibility degree, a multi-objective program is constructed to derive the attribute weights. The ranking order of alternatives is generated by integrating ELECTRE and TOPSIS. Thereby, a new method is put forward for MAGDM with PLTSs. A Fintech example is analyzed to show the effectiveness of the proposed method. The sensitivity analysis and comparative analyses are conducted to illustrate its advantages.     

Asymmetric distribution of falling film solution flowing on hydrophilic horizontal round tube

A two-dimension two phase flow model was established to simulate the falling film flow of LiBr solution on a horizontal hydrophilic tube with different solution sprinkle density and tube surface wettability, and the latter has been an overlook factor. The transient characteristics of solution spreading as well as steady film thickness were analyzed. The results show that a continuous film can only be obtained at sufficiently greater sprinkle density with real surface wettability, the liquid coverage of tube surface increases with the increase of sprinkle density or the decrease of static contact angle. The obvious asymmetric distributions of film thickness and film velocity over the horizontal tube surface are demonstrated in a steady state. The thinnest film thickness or maximum film velocity takes place at circumferential angle around 120°. A modified Nusselt equation for predicting the film thickness is suggested and verified by available both simulation and experimental data.     

近场气泡载荷下柔性结构耦合响应实验研究

通过电火花气泡装置和高速摄像设备对气泡与附近刚性/柔性边界间的耦合现象进行实验观测和研究。针对不同材质平板和不同距离参数下气泡脉动实验数据进行整理,对气泡动力学特性如撕裂现象、射流方向特性及气泡迁移特性等进行机理分析;并借助MATLAB开发图片数字化识别程序,分析总结了整个气泡脉动载荷下柔性板的整体运动响应模式和结构中心测点的响应特征。实验结果表明:气泡在柔性板附近收缩时出现“棒槌”状或气泡撕裂及远离对向射流现象;探究气泡载荷下柔性结构响应模式,发现气泡膨胀时柔性板呈一阶响应,收缩时呈现三阶响应及双峰值迁移现象。     

Surface Stoichiometry Control of Colloidal Heterostructured Quantum Dots for High-Performance Photoelectrochemical Hydrogen Generation

Manipulating the separation and transfer behaviors of charges has long been pursued for promoting the photoelectrochemical (PEC) hydrogen generation based on II–VI quantum dot (QDs), but remains challenging due to the lack of effective strategies. Herein, a facile strategy is reported to regulate the recombination and transfer of interfacial charges through tuning the surface stoichiometry of heterostructured QDs. Using this method, it is demonstrated that the PEC cells based on CdSe-(Se_xS_1−x)₄-(CdS)₂ core/shell QDs with a proper S_surface/Cd_surface ratio exhibits a remarkably improved photocurrent density (≈18.4 mA cm⁻² under one sun illumination), superior to the PEC cells based on QDs with Cd-rich or excessive S-rich surface. In-depth electrochemical and spectroscopic characterizations reveal the critical role (hole traps) of surface S atoms in suppressing the recombination of photogenerated charges, and further attribute the inferior performance of excessive S-rich QDs to the impeded charge transfer from QDs to TiO₂ and electrolyte. This work puts forward a simple surface engineering strategy for improving the performance of QDs PEC cells, providing an efficient method to guide the surface design of QDs for their applications in other optoelectronic devices.     

Ultrasonic-assisted rapid and highly efficient liquid-phase exfoliation of α-zirconium phosphate

Journal of Materials Science - α-zirconium phosphate (α-ZrP) was liquid phase exfoliated within 10 min using diethylene glycol amine (DGA) as the exfoliator under ultrasonic...     

基于深度自编码的多视图子空间聚类网络

传统子空间浅层聚类模型对于多视图和非线性数据的聚类性能不佳。为此,提出一种基于深度自编码器的多视图子空间聚类网络模型,通过在深度自编码器中引入子空间聚类中的“自我表示”特性以及加权稀疏表示,提升了多视图子空间聚类算法的学习能力。推导的深度自编码多视图子空间聚类算法能够聚类具有复杂结构的数据点。通过多视图数据集验证了提出算法的有效性。结果表明,该方法能够有效地挖掘数据固有的多样性聚类结构,并利用多个视图之间互补信息,在性能上与现有方法相比有较大的提升。     

Molecular engineering of “A-D-D-A” dual-emitting-cores emitters with thermally activated delayed fluorescence and aggregation-induced emission characteristics

Endowing thermally activated delayed fluorescence (TADF) emitter with aggregation-induced emission (AIE) peculiarity is of great significance for realizing more promising commercial applications. Herein, two new dual-emitting-cores emitters with a structure of acceptor-donor-donor-acceptor (A-D-D-A), namely 2DBT-BZ-2Cz and 2DFT-BZ-2Cz, were designed and synthesized to explore their luminescence trait. The emitters, adopting dual carbazole as donor segments and dual phenyl ketone in peripheral skeleton as electron acceptor units, were featured with small singlet (S₁)–triplet (T₁) splitting energy (ΔE_ST) of 0.02 eV and 0.01 eV. The efficient thermally activated delayed fluorescence (TADF) characteristics and aggregation-induced emission property make them suitable for nondoped OLED devices. The solution-processed green OLEDs based on 2DBT-BZ-2Cz demonstrated greater device performance with current efficiency of 20.7 cd A⁻¹ and maximum luminescence of 10,000 cd m⁻². This work thus provides the direction to explore luminogens of dual-emitting-cores with TADF and AIE features as promising candidates in solid state lighting.     

仿鱼鳞PDA纳米片复合滤膜的制备及油水分离性能

以聚多巴胺(PDA)为原料、Mg(OH)₂为模板剂，采用液相沉积法原位包覆Mg(OH)₂纳米片制备了PDA纳米片，再以疏水棉布为基底，PDA纳米片为覆盖层制备了PDA纳米片复合滤膜(简称复合滤膜)。通过SEM、TEM、BET、FTIR、XPS、XRD和接触角测量仪对复合滤膜进行了结构表征，同时测定了复合滤膜对油水混合物和乳化油的分离性能、循环使用性能和抗污染性能。结果表明，PDA纳米片的引入显著地增加了复合滤膜的表面粗糙度，在自重作用下复合滤膜对油水混合物和乳化油(均以环己烷为油相)的渗透通量分别为2866.24和1015.13 L/(m²·h)，分离效率达99.5%，且复合滤膜在重复使用10次后，其对乳化油的渗透通量为798.11 L/(m²·h)，分离效率达98.1%。此外，PDA纳米片还具有普适性，能覆盖在不同基底上进行乳化油分离，具有良好的应用前景。     

抗肿瘤海洋真菌的筛选及菌株HGQ6的初步研究

筛选抗肿瘤活性海洋真菌,鉴定活性菌株并初步研究其活性代谢产物的理化性质。从连云港近岸海域沉积物中共分离得到真菌31株,发现它们的培养物普遍具有抗肿瘤活性,其中4株真菌的培养物具有显著的细胞毒活性（抑制率〉80%）。对活性菌株HGQ6的研究表明,其发酵液对多种肿瘤细胞呈现显著的细胞毒活性,活性产物为极性中等、热稳定性较好和耐酸不耐碱的物质。根据菌株的形态学特征和ITS序列分析结果,将菌株HGQ6鉴定为产黄青霉（Penicillium chryso-genum）。