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Intermolecular hydrogen-bonding as a robust tool toward significantly improving the photothermal conversion efficiency of a NIR-II squaraine dye

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Chinese Chemical Letters 2024年第4期35卷 310-315页

作者： Songtao Cai Liuying Wu Yuan Li Soham Samanta Jinying Wang Bing Liu feihu Wu Kaitao Lai Yingchao Liu Junle Qu Zhigang Yang Center for Biomedical Photonics&Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China

The photothermal therapy(PTT) has come across as a promising noninvasive therapeutic strategy for tumor treatment. However, low photothermal conversion efficiency(PCE) and hydrophobicity may impede the therapeutic efficacy of organic photothermal agents and an efficient PTT-agent must overcome these two major challenges. In this work, we developed a new strategy to promote higher PCE wherein the intermolecular hydrogen-bonding interaction between the single dye molecule and water facilitated the transformation of the absorbed energy into the heat. A hydrophilic squaraine dye(SCy1) with the second near-infrared region(NIR-II) absorption and extremely low emission were designed to exhibit much higher PCE than that of the analogues of pentamethine-dyes(PCy1, PCy2). The presence of the ‘–O-' at middle of squaric cycle enabled the intermolecular H-bonding formation between the SCy1 and water to promote the energy dissipation channel. Moreover, the introduction of long-chain phenylsulfonate groups helped in to improve the water solubility apart from serving as an additional means of further enhancing PCE through fluorescence quenching. Therefore, SCy1 with a squaraine backbone and long-chain sulfonate moieties revealed outstanding photothermal stability and anti-aggregation activity apart from showing exceptionally high PCE(74%) in water. SCy1 demonstrated excellent therapeutic efficacy when applied in the PTT treatment of tumor-bearing mice under a laser irradiation of 915 nm.

关键词： Squaraine-based cyanine Hydrogen bonds High PCE Anti-aggregation Photothermal therapy

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O形圈水下吸附状态及脱落现象分析与计算

润滑与密封 2023年第3期48卷 113-119页

作者：赵飞虎许可赵国良齐新中国船舶科学研究中心江苏无锡214082 深海技术科学太湖试验室江苏无锡214082 深海载人装备国家重点实验室江苏无锡214082

安装于舱口盖锥形密封面上的O形圈,在水下开盖初始阶段处于吸附状态并存在开盖后脱落的风险。为保证开盖后O形圈不会发生脱落,采用有限元仿真的方法分析O形圈在密封槽内的吸附移动状态,通过受力分析确定O形圈发生脱落时相应的临界位置;... 详细信息

安装于舱口盖锥形密封面上的O形圈,在水下开盖初始阶段处于吸附状态并存在开盖后脱落的风险。为保证开盖后O形圈不会发生脱落,采用有限元仿真的方法分析O形圈在密封槽内的吸附移动状态,通过受力分析确定O形圈发生脱落时相应的临界位置;结合赫兹接触理论提出O形圈临界参数的计算方法,并通过对O形圈多个相关变量的灵敏度分析,确定选型设计中临界参数最适合的变量。结果表明:对于锥形密封面舱口盖,若水下开盖时O形圈两侧存在压差,则必然存在吸附状态,若O形圈保持吸附状态移动并与密封槽棱圆角接触后,则开盖后密封圈会发生脱落现象;为了避免脱落现象的发生,在O形圈选型设计时必须考虑其临界参数,并根据其数值大小调整O形圈相关参数;其中,O形圈内径参数对压差变化的灵敏度最低,因此在O形圈设计过程中可通过调整内径参数来确保O形圈不会发生脱落。通过水下开盖试验,验证临界参数值的可信度和计算方法的合理性。

关键词：水下吸附脱落现象锥形密封面 O形圈

Recycling arsenic-containing bio-leaching residue after thermal treatment in cemented paste backfill:Structure modification,binder properties and environmental assessment

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International Journal of Minerals,Metallurgy and Materials 2024年第10期31卷 2136-2147页

作者： Dengfeng zhao Shiyu Zhang Yingliang zhao Department of Mining Engineering Lyuliang UniversityLvliang 033000China School of Civil and Environmental Engineering University of Science and Technology BeijingBeijing 100083China School of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 00852China

The substantial arsenic(As)content present in arsenic-containing bio-leaching residue(ABR)presents noteworthy environ-mental challenges attributable to its inherent instability and susceptibility to *** its elevated calcium sulfate content,ABR exhibits considerable promise for industrial *** study delved into the feasibility of utilizing ABR as a source of sulfates for producing super sulfated cement(SSC),offering an innovative binder for cemented paste backfill(CPB).Thermal treatment at varying temperatures of 150,350,600,and 800℃ was employed to modify ABR’s *** investigation encompassed the examination of phase transformations and alterations in the chemical composition of As within ***,the hydration characteristics of SSC utilizing ABR,with or without thermal treatment,were studied,encompassing reaction kinetics,setting time,strength development,and *** findings revealed that thermal treatment changed the calcium sulfate structure in ABR,consequently impacting the resultant sample ***,calcination at 600℃ demonstrated optimal modification effects on both early and long-term strength *** enhanced performance can be attributed to the augmented formation of reaction products and a densified ***,the thermal treatment elicited modifications in the chemical As fractions within ABR,with limited impact on the As immobilization capacity of the prepared binders.

关键词： cemented paste backfill bio-leaching residue arsenic immobilization binder hydration calcination

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煤矿综采工作面采煤机线缆联动智能化设计

机械管理开发 2020年第11期35卷 235-236,265页

作者：赵飞虎同煤集团同家梁矿山西大同037025

为了解决综采工作面采煤机在行走环节中出现的电缆夹多次重叠、互相刮卡、线缆被磨损等故障,提出了使用智能系统拖行线缆的观点.通过设计出一种应用动力牵引采煤机拖缆架行走的智能采煤机线缆联动系统,同时通过配置电控系统以检测和引... 详细信息

为了解决综采工作面采煤机在行走环节中出现的电缆夹多次重叠、互相刮卡、线缆被磨损等故障,提出了使用智能系统拖行线缆的观点.通过设计出一种应用动力牵引采煤机拖缆架行走的智能采煤机线缆联动系统,同时通过配置电控系统以检测和引导采煤机线缆联动系统的工作状态,以保障采煤机线缆的顺畅运行.

关键词：线缆联动电缆夹拖缆综采

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生态建筑与城市发展的协调

中国科技信息 2010年第9期 330-331页

作者：赵飞虎中国人民解放军95588部队后勤部机营科

文章从建设领域实施可持续发展战略的角度阐述了生态建筑的特征,设计目标,设计原则;在可持续发展原则的基础上,探讨生态建筑与城市发展的协调问题。

关键词：生态建筑设计目标设计原则城市发展

Automatic modeling algorithm of stochastic error for inertial sensors

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Control Theory and Technology 2024年第1期22卷 81-91页

作者： Luodi zhao Long zhao School of Automation Science and Electrical Engineering Beihang UniversityBeijing100191China Digital Navigation Center Beihang UniversityBeijing100191China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing100191China

This paper proposes an automatic algorithm to determine the properties of stochastic processes and their parameters for inertial error. The proposed approach is based on a recently developed method called the generalized method of wavelet moments (GMWM), whose estimator was proven to be consistent and asymptotically normally distributed. This algorithm is suitable mainly (but not only) for the combination of several stochastic processes, where the model identification and parameter estimation are quite difficult for the traditional methods, such as the Allan variance and the power spectral density analysis. This algorithm further explores the complete stochastic error models and the candidate model ranking criterion to realize automatic model identification and determination. The best model is selected by making the trade-off between the model accuracy and the model complexity. The validation of this approach is verified by practical examples of model selection for MEMS-IMUs (micro-electro-mechanical system inertial measurement units) in varying dynamic conditions.

关键词： GMWM Stochastic process Inertial sensor Sensor calibration Error model Allan variance

Meeting the challenges of invasive alien species

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National Science Review 2024年第3期11卷 296-298页

作者： Weijie zhao NSR news

The Xinjiang Uygur Autonomous Region of China is famous for its tomato production. Abundant sunshine, large day–night temperature difference and the abundant irrigation by snowmelt from the Tianshan Mountains produce...

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Ling-Ling Chen: RNA has its own features;don't study it as a protein

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National Science Review 2024年第2期11卷 301-305页

作者： Weijie zhao NSR

Non-coding RNA(ncRNA) has been a very active research area over the past 30 years. From small nc RNA – the discovery of RNA interference won the lead researchers the Nobel Prize, to long ncRNA(lncRNA), which has attracted much attention in recent years, various nc RNAs participate in all kinds of biological processes and show a variety of biomedical application prospects.

关键词： RNA

Giant Flexoelectric Effect in Snapping Surfaces Enhanced by Graded Stiffness

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Acta Mechanica Solida Sinica 2024年第4期37卷 528-540页

作者： Chuo zhao Department of Aeronautics Imperial College LondonSouth Kensington CampusLondonSW72AZUK

Flexoelectricity is present in nonuniformly deformed dielectric materials and has size-dependent properties, making it useful for microelectromechanical systems. Flexoelectricity is small compared to piezoelectricity;therefore, producing a large-scale flexoelectric effect is of great interest. In this paper, we explore a way to enhance the flexoelectric effect by utilizing the snap-through instability and a stiffness gradient present along the length of a curved dielectric plate. To analyze the effect of stiffness profiles on the plate, we employ numerical parameter continuation. Our analysis reveals a nonlinear relationship between the effective electromechanical coupling coefficient and the gradient of Young’s modulus. Moreover, we demonstrate that the quadratic profile is more advantageous than the linear profile. For a dielectric plate with a quadratic profile and a modulus gradient of − 0.9, the effective coefficient can reach as high as 15.74 pC/N, which is over three times the conventional coupling coefficient of piezoelectric material. This paper contributes to our understanding of the amplification of flexoelectric effects by harnessing snapping surfaces and stiffness gradient design.

关键词： Functionally graded material Flexoelectricity Numerical continuation Snap-through instability