Achieving Narrowed Bandgaps and Blue-Light Excitability in Zero-Dimensional Hybrid Metal Halide Phosphors via Introducing Cation-Cation Bonding

Zero-dimensional(0D)hybrid metal halides,which consist of organic cations and isolated inorganic metal halide anions,have emerged as phosphors with efficient broadband emissions.However,these materials generally have too wide bandgaps and thus cannot be excited by blue light,which hinders their applications for efficient white light-emitting diodes(WLEDs).The key to achieving a blue-light-excitable 0D hybrid metal halide phosphor is to reduce the fundamental bandgap by rational chemical design.In this work,we report two designed hybrid copper(I)iodides,(Ph_(3)MeP)_(2)Cu_(4)I_(6)and(Cy_(3)MeP)_(2)Cu_(4)I_(6),as blue-light-excitable yellow phosphors with ultrabroadband emission.In these compounds,the[Cu_(4)I_(6)]^(2-)anion forms an I6 octahedron centered on a cationic Cu_(4)tetrahedron.The strong cation-cation bonding within the unique cationic Cu_(4)tetrahedra enables significantly lowered conduction band minimums and thus narrowed bandgaps,as compared to other reported hybrid copper(I)iodides.The ultrabroadband emission is attributed to the coexistence of free and self-trapped excitons.The WLED using the[Cu_(4)I_(6)]^(2-)anion-based single phosphor shows warm white light emission,with a high luminous efficiency of 65 Im W^(-1)and a high color rendering index of 88.This work provides strategies to design narrow-bandgap 0D hybrid metal halides and presents two first examples of blue-light-excitable 0D hybrid metal halide phosphors for efficient WLEDs.

Accelerating Oxygen Electrocatalysis Kinetics on Metal-Organic Frameworks via Bond Length Optimization

Metal-organic frameworks(MOFs)have been developed as an ideal platform for exploration of the relationship between intrinsic structure and catalytic activity,but the limited catalytic activity and stability has hampered their practical use in water splitting.Herein,we develop a bond length adjustment strategy for optimizing naphthalene-based MOFs that synthesized by acid etching Co-naphthalenedicarboxylic acid-based MOFs(donated as AE-CoNDA)to serve as efficient catalyst for water splitting.AE-CoNDA exhibits a low overpotential of 260 mV to reach 10 mA cm^(−2)and a small Tafel slope of 62 mV dec^(−1)with excellent stability over 100 h.After integrated AE-CoNDA onto BiVO_(4),photocurrent density of 4.3 mA cm^(−2)is achieved at 1.23 V.Experimental investigations demonstrate that the stretched Co-O bond length was found to optimize the orbitals hybridization of Co 3d and O 2p,which accounts for the fast kinetics and high activity.Theoretical calculations reveal that the stretched Co-O bond length strengthens the adsorption of oxygen-contained intermediates at the Co active sites for highly efficient water splitting.

Bond Behavior between BFRP Bars and Hybrid Fiber Recycled Aggregate Concrete after High Temperature

The aim of this study is to improve the bond performance of basalt fiber reinforced polymer(BFRP)bars and recycled aggregate concrete(RAC)after being exposed to high temperatures.The bond behavior(failure modes,bond strength,bond stress-slip curves)between BFRP bars and hybrid fiber recycled aggregate concrete(HFRAC)after being exposed to temperatures ranging from 20℃up to 500℃was studied by using pull-out tests.The effect of high temperatures on mechanical properties of concrete(compressive strength,splitting tensile strength)and tensile strength of BFRP bars was also investigated.The bond strength decreased as the temperature increased and the drop of bond strength between RAC and BFRP bar was larger than that between HFRAC and BFRP bar.As the temperature rises,the key factor affecting the bond strength was gradually transformed from concrete strength to BFRP bar strength.The relationship between bond stress and slip in the dimensionless bond stress-slip ascending section was established,which was in good agreement with the experimental results.

Magnetic Properties and Intergranular Action in Bonded Hybrid Magnets

Magnetic properties and intergranular action in bonded hybrid magnets,based on NdFeB and strontium ferrite powders were investigated.The long-range magnetostatic interaction and short-range exchange coupling interaction existed simultaneously in bonded hybrid magnets,and neither of them could be neglected.Some magnetic property parameters of hybrid magnets could be approximately obtained by adding the hysteresis loops of two magnets pro rata.

A Single Mode Hybrid Ⅲ-Ⅴ/Silicon On-Chip Laser Based on Flip-Chip Bonding Technology for Optical Interconnection

A single mode hybrid Ⅲ-Ⅴ/silicon on-chip laser based on the flip-chip bonding technology for on-chip optical interconnection is demonstrated. A single mode Fabry-Perot laser structure with micro-structures on an InP ridge waveguide is designed and fabricated on an InP/AIGaInAs multiple quantum well epitaxial layer structure wafer by using i-line lithography. Then, a silicon waveguide platform including a laser mounting stage is designed and fabricated on a silicon-on-insulator substrate. The single mode laser is flip-chip bonded on the laser mounting stage. The lasing light is butt-coupling to the silicon waveguide. The laser power output from a silicon waveguide is 1.3roW, and the threshold is 37mA at room temperature and continuous wave operation.

BFRP筋与超高性能纤维混凝土黏结性能试验研究

为探究玄武岩纤维增强复合材料(BFRP)筋与超高性能纤维混凝土(UHPFRC)之间的黏结性能,通过中心拉拔试验,对BFRP-UHPFRC试件破坏模式、黏结-滑移曲线进行分析,且探讨了筋材直径、单一纤维及钢-PVA混杂纤维对黏结强度的影响。结果表明,试件破坏模式包括BFRP筋拔出破坏与拉断破坏。BFRP筋直径的增大将导致黏结强度降低。随着单一纤维掺量增加,黏结强度呈先增大后减小的趋势。而相较于单一纤维,钢-PVA混杂纤维显著提高了试件的黏结强度,当掺入1%钢纤维和0.5%PVA纤维时,黏结强度最高(25.35 MPa)。此外,通过灰狼算法优化的支持向量回归模型实现对黏结强度的预测,预测值与实际值拟合较好。

高温后钢-PVA混杂纤维高性能混凝土与变形钢筋黏结性能试验

为研究高温后钢-聚乙烯醇(polyvinyl alcohols,PVA)混杂纤维高性能混凝土(hybrid fiber high performance concrete,HFHPC)与变形钢筋的黏结性能退化规律,以200、400、600、800℃为目标温度,选取钢纤维体积率、PVA纤维体积率、矿粉掺量为正交试验因素设计并制作25组HFHPC试件,完成了单调荷载下的中心拉拔试验。结果表明:高温后各组HFHPC试件黏结破坏形态均表现为钢筋拔出破坏;试验温度范围内,对HFHPC试件黏结强度的影响程度均为:钢纤维体积率最大、矿粉掺量次之、PVA纤维体积率最小;随着温度的升高,HFHPC试件黏结强度逐渐下降,且在相同温度条件下,HFHPC试件黏结强度和峰值滑移相比于未掺纤维的混凝土试件均有所提升,其中,200℃时HFHPC试件的黏结强度提升最为显著,分别提升了33.69%、35.76%、37.54%和46.03%;混杂纤维能显著提高高温后高性能混凝土与钢筋的峰值界面能,明显改善黏结延性和耗能能力;提出的考虑温度作用后的混杂纤维混凝土与钢筋黏结-滑移模型与试验实测结果吻合较好,可为火灾后混杂纤维高性能混凝土结构损伤评估及加固方案提供参考。

酸性环境下粘接剂对异质压印接头剥离强度的影响

为探究酸性环境下粘接剂对异质压印接头剥离强度的影响,以热轧双相钢DP590和AA5052作为原材料,以0.02 mol·L^(-1)的NaHSO_(3)溶液作为腐蚀液,对异质压印接头(压印接头)和粘接-压印接头(粘-压复合接头)进行了干湿周浸交替腐蚀试验,通过静力学试验、微观失效断口以及能谱分析研究了接头在酸性环境下的静力学性能和失效机理。结果表明:粘接剂的使用显著提高了接头的最大失效载荷,粘-压复合接头的承载能力较压印接头提高了56.3%。粘接剂的使用对接头的失效形式未产生影响,在腐蚀时间为0 h时,压印接头和粘-压复合接头的失效形式均为内锁拉脱失效,但随着腐蚀的进行,失效形式逐渐转变为颈部断裂失效。粘-压复合接头上板的微观断口形貌均表现为韧窝状,下板拉伸失效部位的划痕逐渐加深。酸性腐蚀环境下压印接头搭接区域表面元素特征较粘-压复合接头变化明显,表明粘接剂的使用对压印接头起到了一定的保护作用。

Chiplet晶圆混合键合技术研究现状与发展趋势

半导体产业对国防安全和国民经济发展意义重大,高端半导体装备也是国外对华技术封锁的重点领域。混合键合技术作为微电子封装和先进制造领域的一种新型连接技术,已经成为实现芯片堆叠、未来3D封装的一项关键技术,是实现高性能、高密度和低功耗芯片设计的关键技术之一。分析了Chiplet晶圆混合键合技术应用背景,梳理了典型工艺及设备研究的现状,并展望了晶圆混合键合技术发展趋势。

GFRP筋混杂纤维混凝土隧道管片力学性能研究

为研究GFRP筋混杂纤维混凝土隧道管片的力学性能,进行了三个不同GFRP筋配筋率的钢-聚丙烯纤维混凝土管片静力受弯试验,获得了试件的破坏形态、承载力及裂缝扩展模式。考虑GFRP筋与混杂纤维混凝土的界面黏结,采用ABAQUS建立了GFRP筋混杂纤维混凝土管片的有限元模型,分析了不同混杂纤维掺量和配筋率对管片受弯承载力的影响。研究结果表明:GFRP筋混杂纤维混凝土管片的破坏主要是由跨中主裂缝贯穿和GFRP筋材断裂导致;在纤维体积掺量不变的情况下,提高纵向受拉GFRP筋的配筋率,可以有效提高管片的受弯承载力;在数值计算中,考虑GFRP筋与混杂纤维混凝土的界面黏结滑移的有限元模型能更准确地模拟试件的开裂荷载、极限荷载和弯曲刚度;在承载力不变的情况下,增加混杂纤维的体积分数能有效减少管片的配筋率,并且提高管片的抗变形能力;通过回归分析,提出了纤维掺量与配筋率关系的计算式,理论计算结果与数值结果符合较好。

Hybrid-integrated 200 Gb/s REC-DML array transmitter based on photonic wire bonding technology

An 8-channel hybrid-integrated chip for 200 Gb/s(8×25 Gb/s)signal transmission has been demonstrated.The channels are all within the O-band,and with a spacing of 800 GHz.The core of this chip is a monolithic integrated multi-wavelength laser array of 8 directly-modulated distributed feedback(DFB)lasers.By using the reconstruction equivalent chirp technique,multi-wavelength integration and asymmetric phase shift structures are achieved in the laser array.The output laser beams of the array are combined by a planar light-wave circuit,which is hybrid-integrated with the laser array by photonic wire bonding.Experiment results of this transmitter chip show good single-mode working of each unit laser,with a sidemode suppression ratio above 50 dB,and the modulation bandwidth is above 20 GHz.Clear eye diagrams are obtained in the lasers for 25 Gb/s non-return-to-zero modulation,which implies a total 200 Gb/s transmission rate for the whole chip.

TBL教学法在无机化学教学中的应用——化学“101计划”无机化学课程教学设计案例

化学键理论是无机化学重要学习内容,从经典共价键理论到分子轨道理论均展现出丰富的科学内涵。但化学键理论的多样性和适用局限性,给学生学习和理解带来了一定的困难。尤其在对化合物性质进行分析时,选用不同的理论可能得到不同的结论。因此,本文聚焦于化学研究的核心思想,即“构效关系”的分析,以“101计划”推动人才培养从“知识为主”转向“能力为先”的实施目标出发,从学生的学习体验和收获视角讨论TBL教学法的引入对学生建立化学键理论的整体知识框架,以及提升运用相关理论理解、分析与解决实际问题综合能力的作用。

宽幅混合梁斜拉桥钢-混结合段温度效应研究

文中基于热传导理论和ABAQUS有限元数值模拟,分析了日照非均匀温度作用下宽幅混合梁斜拉桥钢-混结合段温差以及温度应力分布特征.结果表明:钢-混结合段温度传递具有一定的滞后性,顶板升温和降温幅度明显高于底板;钢梁过渡段横向温差在悬臂处较为明显,最大变化幅4.6℃;横隔板竖向存在明显的温度梯度,在18时钢箱梁过渡段产生最大竖向温差,约为14℃;结合段在温度作用下,钢梁总体受压,局部受拉,拉应力集中在锚固腹板处,混凝土梁整体受拉,局部受压,压应力集中在悬臂段中部.

无凸点混合键合三维集成技术研究进展

数字经济时代,高密度、低延迟、多功能的芯片是推动人工智能、大模型训练、物联网等高算力需求与应用落地的基石。引线键合以及钎料凸点的倒装焊存在大寄生电容、高功耗、大尺寸等问题,使传统封装难以满足窄节距、低功耗、小尺寸的应用场景。无凸点混合键合技术能够实现极窄节距的互连,在有效避免倒装焊凸点之间桥连短路的同时降低了寄生电容,减小了封装尺寸和功耗,满足了高性能计算对高带宽、多功能的要求。对无凸点混合键合技术所采用的材料、键合工艺与方法以及当前在三维集成中的应用展开介绍,并对其发展趋势进行了展望。

集成电路异构集成封装技术进展

随着集成电路临界尺寸不断微缩,摩尔定律的持续性受到了越来越大的挑战,这使得不同类型芯片的异构集成技术成为后摩尔时代至关重要的技术趋势。先进封装技术正在经历一场转型,其关注点逐渐从单一器件转向整体系统性能和成本。传统的芯片封装正朝着三维堆叠、多功能集成和混合异构集成的方向发展,以实现集成产品的高度集成、低功耗、微型化和高可靠性等优势。概述了芯片异构集成封装技术的发展轨迹和研究现状,并探讨了面临的技术挑战以及未来的发展趋势。

Model-Based Fault Tolerant Control for Hybrid Dynamic Systems with Sensor Faults

A model-based fault tolerant control approach for hybrid linear dynamic systems is proposed in this paper. The proposed method, taking advantage of reliable control, can maintain the performance of the faulty system during the time delay of fault detection and diagnosis (FDD) and fault accommodation (FA), which can be regarded as the first line of defence against sensor faults. Simulation results of a three-tank system with sensor fault are given to show the efficiency of the method.

Hybrid Coat在牙齿敏感的临床应用研究

选取2015年3月~2015年12月在我院治疗的55例牙齿敏感患者。随机分为观察组30例和对照组25例。对照组患者给予Single Bond脱敏治疗,观察组患者给予Hybrid Coat脱敏治疗,对比两组患者治疗后即刻、1个月、3个月后的临床疗效,分析Hybrid Coat在牙齿敏感中的临床应用价值。观察组患者治疗后即刻、1个月、3个月后的有效率分别为100%、96.7%和90.0%,对照组分别为88%、观察组84.0%和观察组72.0%,两组比较差异具有统计学意义（P〈0.05）。Hybrid Coat脱敏治疗牙齿敏感疗效显著,具有较高的临床应用价值。

Influence of Phosphoric Acid Etching on the Bond Strength of a Universal Adhesive System to Caries-Affected Dentin

The purpose of this study was to evaluate the influence of acid etching on the bond strength of a universal adhesive system (Single Bond Universal, 3M) to caries-affected dentin. Forty permanent third molars were selected and carious lesions were induced by the microbiological method with?S. mutans?ATCC25175. Teeth were allocated randomly across four experimental designs (n?=?10): PA-I: phosphoric acid etching and application of the adhesive system, followed by immediate microtensile bond strength testing;PA-CC: phosphoric acid etching and application of the adhesive system, followed by microtensile bond strength testing after a 14-day cariogenic challenge;NPA-I: application of the adhesive system without acid etching, followed by immediate bond strength testing and NPA-CC: application of the adhesive system without acid etching followed by bond strength testing after 14-day cariogenic challenge. For microtensile bond strength testing,?a restoration with Charisma composite resin was made and each specimen was sectioned with a cross-sectional area of 1 mm2. Only adhesive and mixed fractures were considered for bond strength calculation. Results were evaluated by the Kruskal-Wallis and Friedman tests. The highest bond strengths were observed in the phosphoric acid etching groups (p??0.05). Cariogenic challenge did not affect bond strength (p?>?0.05). The predominant fracture type was adhesive. We conclude that phosphoric acid increased the bond strength of the Single Bond Universal system to caries-affected dentin, and that cariogenic challenge did not interfere with this bond strength.

Structural considerations in friction welding of hybrid Al_2O_3-reinforced aluminum composites

Comparative studies on the relationship between the welding parameters and joining efficiency in the friction welding of hybrid Al203-reinforced aluminum composites were conducted. Metal matrix composites （MMCs） with 37% （volume fraction） aluminum particle were joined by friction welding. The results show that the effects of the rotation speed on the reduction rate of particle size are greater than those of the upset pressure, and the area of the MMC weld zone decreases as the joining efficiency increases, while it is considered that the joining efficiency does not increase as the reduction rate of particle size decreases. During the macro-examination of the bonding interlace, a gray discolored region was observed on the bonding interface, and the center of the region was dark gray. After the micro-examination of the bonding interface, base metal made some second particulate formed by condensed alumina particulate but discoloration part distributed minute alumina particulate without second particulate. Consequently, it was also observed that rotational speed of 3 000 r/min and upset pressure of 63.6 MPa showed a very good.joint.

Thermoelectric performance of Bi_(2)Sn_(2)Te_(6)monolayer with ultralow lattice thermal conductivity induced by hybrid bonding properties:A theoretical prediction

The crystal structure,mechanical stability,phonon dispersion,electronic transport properties and thermoelectric(TE)performance of the Bi_(2)Sn_(2)Te_(6)monolayer are assessed with the first-principles calculations and the Boltzmann transport theory.The Bi_(2)Sn_(2)Te_(6)monolayer is an indirect semiconductor with a band gap of 0.91 eV using the Heyd-Scuseria-Ernzerhof(HSE06)functional in consideration of the spin-orbit coupling(SOC)effect.The Bi_(2)Sn_(2)Te_(6)monolayer is high thermodynamically and mechanically stable by the assessments of elastic modulus,phonon dispersion curves,and ab initio molecular dynamics(AIMD)simulations.The hybrid bonding characteristics are discovered in Bi_(2)Sn_(2)Te_(6)monolayer,which is advantageous for phonon scattering.The antibonding interactions near the Fermi level weaken the chemical bonding and reduce the phonon vibrational frequency.Due to the short phonon relaxation time,strong anharmonic scattering,large Grüneisen parameter,and small phonon group velocity,an ultralow lattice thermal conductivity(0.27 W/(m·K)@300 K)is achieved for the Bi_(2)Sn_(2)Te_(6)monolayer.The optimal dimensionless figure of merit(ZT)values for the n-type and p-type Bi_(2)Sn_(2)Te_(6)monolayers are 2.68 and 1.63 at 700 K,respectively,associated with a high TE conversion efficiency of 20.01%at the same temperature.Therefore,the Bi_(2)Sn_(2)Te_(6)monolayer emerges as a promising candidate for TE material with high conversion efficiency.