The supersaturation degree of perovskite precursors is hardly controllable, usually leading to explosive nucleation, which is a great challenge for the solution growth of large‐scale single crystals. In this work, a straightforward strategy is developed to simultaneously achieve precise nucleation control and significant growth acceleration of diverse perovskite single crystals through self‐assembled propyl methacrylate‐polyhedral oligomeric silsesquioxane (PMA‐POSS) microvesicles. The microvesicles encapsulate high concentrations of perovskite precursors and achieve localized release via thermal polymerization‐induced rupture. As the precursor concentration locally surges in the micro‐region, the nucleation number is conspicuously suppressed and the crystal growth rate is expedited almost threefold. More importantly, the as‐fabricated MAPbI 3 single crystal possesses superior crystal quality in comparison with the routinely grown counterpart, which demonstrates a remarkably low trap density of 8.76 × 10 8 cm −3 and an impressive X‐ray response sensitivity of 2.67 × 10 5 µC Gy air −1 cm −2 . This work provides an effective and universal methodology for high‐quality perovskite single crystal fabrication.

The iodide precursor oxidation has persistently plagued solution grown iodine-based perovskite single crystals (IPSCs) that inevitably introduce undesirable triiodide ion (I3-) defects and severely hindering crystal quality, despite IPSCs having garnered remarkable progress in multifarious photoelectronic applications. In this work, the spontaneously inhibited iodide oxidation is discovered in an eco-friendly solvent, gamma-Valerolactone (GVL), and demonstrates a universal solution approach for fabricating high-quality IPSCs. Compared to the routine gamma-Butyrolactone (GBL) system, GVL provides a lowered growth temperature and a significantly broadened inverse temperature operation window, thereby improving the theoretical utilization rate of perovskite precursors up to 88.6%. More importantly, due to its higher open-ring hydrolysis energy, GVL can spontaneously inhibit the iodide precursors oxidation without any additional reductant and therefore effectively prevent the forming I3- defects. Typically, the as-fabricated MAPbI3 single crystal possesses an extremely low trap density of 3.57 x 108 cm-3 and a high carrier mobility-lifetime (mu tau) product of 2.74 x 10-3 cm2 V-1, which enables its photodetection capabilities to be on a par with the state-of-art MAPbI3 single crystal photodetectors. This work paves an efficacious and green pathway for high-quality IPSC fabrication toward advanced optoelectronic utilizations. This work demonstrates a universal solution approach by solely utilizing an eco-friendly solvent, gamma-Valerolactone (GVL), for high-quality iodine-based perovskite single crystals fabrication, which cannot only promote the precursor utilization rate up to 88.6% through broadened crystalline growth window but spontaneously inhibit the iodide oxidation without any additional reductant and effectively preventing the I3- defects formation. image

The use of amino-terminated siloxanes as coupling interface for perovskite single crystals (PSCs)/silicon integrated devices has been demonstrated to be an effective method toward CMOS compatible optoelectronics; however, it suffers from the coupling stability against the hydrophilicity of the exposed terminal amino groups. In this work, a phenyl-terminated interfacial molecule, anilino-methyl-triethoxysilane (AMTES), is proposed to achieve the effectively galvanic coupling between PSCs and silicon, which can not only improve the device environmental reliability but also lower the surface energy of the silicon substrate so as to facilitate the epitaxial growth of PSCs. Benefiting from the interfacial coupling of AMTES, the obtained MAPbI3 SC/silicon integrated device possesses highly efficient multiwavelength photodetection properties across the X-ray and NIR range, which exhibits a specific detectivity D* of 3.84 × 1013 cm Hz1/2 W-1 in the visible-NIR region and an X-ray sensitivity of 1.18 × 104 μC Gyair-1 cm-2 with the lowest detection limit of 49.6 nGyair s-1. The ultra wide -3 dB bandwidth of 67,300 Hz and the linear dynamic range (LDR) of 112 dB also prove its impressive dynamic response capabilities. Moreover, the AMTES modified integrated device almost maintains 96% of the initial photodetection performance even after keeping in the atmosphere environment for 28 days. This work opens a new avenue for interfacial engineering toward the development of on-chip PSC integrated silicon optoelectronic devices.

Here, the fabrication of an addressable 8 × 8 photodetector array is reported by combining In2Se3 nanofilm with periodic inverse micropyramid‐Si (PIMP‐Si), which is obtained through colloidal lithography and anisotropic wet etching. Due to the unique configuration and the outstanding light trapping effect, the as‐fabricated heterojunction device presents an excellent self‐powered photoresponse over the broadband wavelength range from 265 to 1300 nm, with a peak sensitivity at ≈810 nm. The responsivity, specific detectivity, and rise/fall time are estimated to be 0.58 A W−1, 1.76 × 1012 Jones, and 5.1/18 µs, respectively, which are competitive in comparison with other devices with similar geometries. Meanwhile, the photodetector array displays a satisfactory pixel‐to‐pixel uniformity, which allows the device to record the full‐color image of “HFUT” with satisfying resolution, revealing the potential application of the PIMP‐Si/In2Se3 heterojunction photodetector array for real‐time red‐green‐blue‐infrared image sensing and video capturing.

Extreme mass ratio inspirals (EMRIs) are excellent sources for space-based observatories to explore the properties of black holes and test no-hair theorems. We consider EMRIs with a charged compact object inspiralling onto a Kerr black hole in quasi-circular orbits. Using the Teukolsky and generalized Sasaki-Nakamura formalisms for the gravitational and vector perturbations about a Kerr black hole, we numerically calculate the energy fluxes for both gravitational and vector perturbations induced by a charged particle moving in equatorial circular orbits. With one-year observations of EMRIs, we apply the Fisher information matrix method to estimate the charge uncertainty detected by space-based gravitational wave detectors such as the Laser Interferometer Space Antenna, TianQin, and Taiji, and we find that it is possible to detect vector charges as small as q ∼ 0.0049. The results show that EMRIs composed of a Kerr black hole with a higher spin a and lighter mass M, and a secondary charged object with more vector charge give smaller relative error on the charge, thus constrain the charge better. The positive spin of the Kerr black hole can decrease the charge uncertainty by about one or two orders of magnitude.

监管问询是证券监管的一种补充手段,在防范化解重大风险的背景下,它有助于改善证券市场中的信息质量和含量,在提高证券市场运作效率、维护证券市场公平方面发挥了实质性的作用.近年来,国内外已有不少学者对监管问询的作用机理和效果进行了探索,这些成果对于未来的研究具有重要价值.本文从文献计量的角度,按照"动因—问询—后果"的研究框架归纳总结监管问询机制的影响因素及其经济后果,以期对有意研究该领域的学者有所启发.

提出一种基于SOC的改进电流负荷分配方法,该方法采用均流环、电流环、电压环的三闭环结构,其中,均流控制器的电流基准由理想输出功率和储能单元电池荷电状态(state of charge,SOC)共同决定.搭建了 MATLAB/Simulink 仿真模型和基于 TMS320F28335的并联储能系统半实物仿真平台,对比仿真了不同参数影响下系统的性能.并联储能系统中母线电压能够稳定在理想值,电流负荷能够按SOC合理分配,且各储能单元SOC能够快速收敛到均衡状态,验证了所提改进电流负荷分配方法的可行性和合理性.

自1999年美国西雅图市互联网企业加速器和2000年亚特兰大麦肯锡加速器建立以来(刘小勇和杜佩,2018)[1],其促进科技创新的成效凸显出来,学、工、产、研等社会各界逐渐将目光投向了科技企业加速器.近年来,随着大众创业万众创新生态体系的搭建,我国孵化载体事业如雨后春笋般发展,以大企业为主体的加速器(Corporate Accelerator)逐渐引起关注,加速器作为我国加速科技企业做大做强,推动产业链补强升级,催生新产业新业态的关键环节,能够有效协同创业孵化空间、高新区、创新示范区、产业园各区域空间资源,推动创新创业服务由企业向产业升级,加快构建我国现代产业体系.

考虑双有源桥(DAB)流变换器在储能应用场景,建立双端口DAB等效数学模型;在不同移相条件下推导回流功率、传递功率与移相角之间的函数关系.根据适应度函数和惩罚函数,提出双重移相与鲸鱼算法结合的控制策略(DPS-WOA),可抑制回流功率;该策略可获得全移相比范围内恒定传输功率情况下的最小回流功率移向比组合.DPS-WOA工作原理是:通过鲸鱼优化算法(WOA)对双重移相(DPS)控制方法下的DAB回流功率模型进行最小值求解.对比现有的单重移相(SPS)、DPS、三重移相(TPS)传统优化控制方案验证了控制策略具有更好的回流功率优化能力和全移向范围优化能力.

百年大计,教育为本.党的二十大报告提出的中国式现代化,赋予了大学财会教育新的使命和任务.坚持使命驱动、思政引领、学科交叉、特色凝练,实现数智时代财会教育与科研协同发展,为实施科教兴国战略提供人才支撑.数据要素作为新型战略资源,在企业价值创造中发挥中重要作用,探究数据资产的会计方法,完善多重经济理念下的企业报告体系与决策价值,形成契合中国式现代化发展的资本市场研究理论,通过科教协同、产教融合以及实验科研平台的育人作用,提升数智时代工科院校复合创新型财会人才的培养能力.

一、引言 科技强审是21世纪以来审计发展最显著的特征之一,审计的数字化和智能化特征日益凸显.数智时代,传统审计取证模式、审计流程和审计技术方法不够有效和高效,亟需做出适应性变革.为了有效应对数字化转型的变化与挑战,审计理论和实践发展越来越呈现出跨学科融合的特征,这对审计人员数据分析能力素养提出了更高的要求(毕秀玲和陈帅,2019;张庆龙等,2020).注册会计师应当具备坚实的审计数据分析知识基础,掌握审计数据分析必备的技能,超越传统的比率分析和抽样分析,以便更高效地利用先进数据分析技术提高审计效率、提升审计质量.

由于受到成本、时效、跨业务部门整合难等限制,高校智能财务建设难以打破已有的财务信息化框架,仅实现报销、审核等部分场景的局部应用,缺乏系统有效的整体实现路径.本文通过分析H大学智能财务实践,构筑智能财务票据管理平台,搭建票据数据池,以票据驱动与RPA人机协同释放财务基础工作,实现面向多主体多业务的智能化与自动化管理,以期为高校财务智能化探索提供借鉴.

油库罐区时常发生由着火油罐的强烈热辐射而引燃相邻油罐的火灾事故,扩大燃烧范围.因此,需要对储油罐火焰辐射及其对相邻油池的引燃特性进行研究.本文采用内径分别为74 mm、114 mm、150 mm和200 mm的4种圆形石英玻璃油盘,开展不同油盘间距条件下的庚烷池火和点火实验.结果表明,根据圆柱体模型计算得到的辐射热流预测值与实验值吻合较好.当油盘尺寸一定时,随着油盘间距增大,待引燃油盘点接收的辐射热流逐渐减小;而当油盘间距相同时,油盘直径越大,待引燃油盘中心点接收的辐射热流越大.点火过程按照时间顺序划分为3个阶段:加热升温阶段、蒸气积聚阶段和点火阶段.随着油盘尺寸变大,庚烷的临界辐射热流随之变大且作为低闪点燃料,庚烷的临界辐射热流比高闪点燃料小得多.

In this letter, we demonstrate the fabrication of a conformal CuO/Si microholes array heterojunction through the DC reactive magnetron sputtering from a high-purity Cu target. By using the monolayer graphene as the top electrode, the device served well as a self-poweredvis-NIR photodetector, showinga high responsivity of 301.5 mA W-1, specific detectivity of 7.96 x 10(12) Jones and a fast response speed (rise time 9.9 mu s and fall time 10 mu s) upon 530 nm illumination. Compared to its planar counterpart, the responsivity was remarkably enhanced over the broadband region. The underlying reason should be ascribed to the improved light trapping in the microholes via the longitudinal Fabry-Perot (F-P) cavity resonance, according to theoretical simulation by finite-difference time-domain (FDTD) solution. Such an effect gave rise to an enhanced light-matter interaction, leading to the improved photoresponse. Thiswork also opensup an effective way for the on-chip high performance photodetection due to the well compatibility with the current complementary metal-oxide-semiconductor (CMOS) technology.

通过使用Ag-Cu-Ti钎料钎焊,可以实现SiC陶瓷的有效连接,但它与陶瓷母材热膨胀系数相差较大,钎焊降温过程中会产生较大的残余应力.通过向Ag-26.7Cu-4.5Ti钎料中复合不同体积分数的W颗粒,调节钎料的热膨胀系数,使之更接近于母材.通过改变钎焊温度和保温时间,研究工艺参数对焊缝的显微组织和力学性能的影响.结果表明,W颗粒均匀分布在基体中且未与其他元素反应.当添加合适的体积分数的W颗粒,并且在适当的钎焊温度和保温时间下,能够形成组织均匀、连接良好的复合接头.当添加的W的体积分数为10％,在钎焊温度为807?℃、保温时间为10?min的条件下,可获得高剪切强度为95.05?MPa.

人工智能等新一代信息技术的迅猛发展对审计实践产生重要影响.本文在明晰人工智能概念本质内涵及其系统分类的基础上,全面总结梳理了人工智能、大数据分析、数据挖掘、机器学习、深度学习、区块链和机器人流程自动化等新一代信息技术应用于审计领域的国际研究成果,并从国际"四大"的AI应用状况、审计领域AI应用面临的商业伦理困境以及注册会计师考试模式变革和会计教育课程体系优化等多个维度,系统探究了数字时代人工智能审计应用的策略与路径.

资金管理是集团企业财务管控的重要内容,是现代企业管理的核心.随着集团规模越来越大,子公司越来越多,管理的范围也就随之扩大,导致资金管理以及资金风险管控的内容越来越繁杂,难度越来越大,如何发挥资金规模的优势成为了衡量集团综合实力的因素.传统的资金集中管理模式已经不能满足大多数集团企业的需求,目前结算中心和内部银行等较为先进的资金管理模式都有其优缺点,财务公司模式的门槛较高,所以选择哪种资金管理模式,需要根据集团企业自身的发展战略来确定.文章从文献综述视角对目前资金管理模式进行整理分类,结合风险管理与资金管理模式之间的关系,对当前环境下现代集团企业资金集中管控提出相应的建议.

Patterned growth of periodic perovskite film arrays is essential for application in sensing devices and integrated optoelectronic systems. Herein, we report on patterned growth of addressable perovskite photodetector arrays through an uncured polydimethylsiloxane (PDMS) oligomer-assisted solution-processed approach, in which a periodic hydrophilic/hydrophobic substrate replicating the predesigned patterns of the PDMS stamp was formed due to the migration of uncured siloxane oligomers in the PDMS stamp to the intimately contacted substrate. By using this technique, MAPbI3 film photodetector arrays with neglectable pixel-to-pixel variation, a responsivity of 2.83 A W-1, specific detectivity of 5.4 × 1012 Jones, and fast response speed of 52.7/57.1 μs (response/recovery time) were achieved. An 8 × 8 addressable photodetector array was further fabricated, which functioned well as a real-time image sensor with reasonable spatial resolution. It is believed that the proposed strategy will find potential application in large-scale fabrication of other photodetector arrays, which might be potentially important for future integrated optoelectronic devices.

准确识别客户可能存在的异常行为和舞弊风险是财务报表审计中的关键步骤,面对审计过程中的海量数据,审计人员亟需使用新的理论方法和技术工具,系统地挖掘和分析数据背后隐藏的反映公司舞弊的规律和特征.为了指导审计人员将相关数据挖掘技术高效地应用于具体审计活动,在系统总结和梳理审计大数据的本质内涵与特征分类的基础上,明晰审计大数据挖掘分析与传统数据分析的差异,探寻数据挖掘技术在财务报表舞弊审计中的最佳应用模式,建立数据挖掘技术应用于财务报表舞弊审计中的整合性框架.

针对光伏功率单变量预测方法的不足,设计了一种新型光伏功率多变量相空间重构预测方法.首先,基于相关性分析,选取实际光伏电站的历史光伏功率和气象因素时间序列组成多变量时间序列;然后,利用C-C法和虚假邻近点(false nearest neighbors,FNN)法重构光伏功率预测的多变量相空间,并以小数据法识别其混沌特性;最后,结合径向基函数(radial basis function,RBF)神经网络强大的非线性拟合能力,建立了基于多变量相空间重构和RBF神经网络的光伏功率预测模型.算例分析表明,相较于单变量预测方法,所提出的多变量相空间重构预测方法性能更加优越.