摘要：Cocrystal has been discovered and studied for more than 170 years since 1844, while the applications to optoelectronics only begin in the last decade. Several general questions that chemists and materials scientists currently seek to answer are: can we design and control the molecular self-assembly and cocrystal growth, what’s the packing-property correlations, as well as how can we improve device parameters for real applications in industry. In this contribution, we review our and other groups’ recent advances in the cocrystal research field sequentially including:(1) nucleation and growth mechanisms for selective preparation of cocrystals with different donor/acceptor ratio and morphology;(2) charge transport and electronic devices, particularly field-effect transistor(FET) and photo-response device. We discuss the in-situ single crystal device fabrication method, ambipolar charge transport, and molecular packingcharge separation correlation;(3) photonic and optical property, focusing on optical waveguide, photonic logic computation, and nonlinear optics(NLO). We present unusual optical properties revealed by advanced instruments and general structure-function relations for future study. Importantly, the extensive investigations described herein yield in-depth and detailed understandings of molecular cocrystals,and show that such bi-component material systems together with the developed instrument measurement methodologies have the potential to initiate unconventional electronic and photonic science and technology.

摘要：有机共晶,由于其光热转换性质,为光热成像、生物应用和海水淡化等诸多领域带来了希望和活力.然而,有机共晶的光热转换机制尤其缺少详细且深入的理论研究.本研究使用含时密度泛函理论方法探索了激发和去激发过程,并解释了DBTTF-TCNB共晶比其组分单晶具有更高光热转换效率的原因.结果显示,高激发态的高占比促进了非辐射跃迁的发生.基于DBTTF-TCNB共晶中给电子基团和吸电子基团间的电荷转移结果,我们发现给体和受体之间吸引电子的竞争可能会促进光热转换,且给电子基团在共晶结构中也十分重要.这些结果可为光热转换共晶的设计提供理论指导.轨道贡献和电子密度差进一步证明了我们的结论.因此,本研究从量子化学的角度给光热共晶在创新领域的应用提供了理论依据.

摘要：松花江桦川县悦来堤防段河道近年来受支汊拓宽影响,河势发生变化,主槽深泓南移迫岸,并在学堂通岛端部左岸及岛尾下游右岸悦来泵站附近形成顶冲点,威胁了悦来泵站及悦来段堤防安全。基于松花江悦来堤防段河道类型及其演变特征,采用Delft3D-flow模型对不同防护方案下松花江悦来堤防段河道的流场特征、流速分布及水位变化进行分析,结果表明清滩+丁坝+抛填防护方案能够明显改善悦来堤防附近流场,消减水流流速30%~50%,可有效遏制该段河道冲刷趋势。研究过程采用的计算方法可为类似工程提供参考。

摘要：Photonic synaptic transistors are promising neuromorphic computing systems that are expected to circumvent the intrinsic limitations of von Neumann-based *** design and construction of photonic synaptic transistors with a facile fabrication process and highefficiency information processing ability are highly desired,while it remains a tremendous ***,a new approach based on spin coating of a blend of CsPbBr_(3) perovskite quantum dot(QD)and PDVT-10 conjugated polymer is reported for the fabrication of photonic synaptic *** combination of flat surface,outstanding optical absorption,and remarkable charge transporting performance contributes to high-efficiency photon-to-electron conversion for such perovskite-based ***-performance photonic synaptic transistors are thus fabricated with essential synaptic functionalities,including excitatory postsynaptic current(EPSC),paired-pulse facilitation(PPF),and long-term *** utilizing the photonic potentiation and electrical depression features,perovskite-based photonic synaptic transistors are also explored for neuromorphic computing simulations,showing high pattern recognition accuracy of up to 89.98%,which is one of the best values reported so far for synaptic transistors used in pattern *** work provides an effective and convenient pathway for fabricating perovskite-based neuromorphic systems with high pattern recognition accuracy.

摘要：In view of the incremental learning problem of manifold learning algorithm, an adaptive neighborhood incremental principal component analysis(PCA) and locality preserving projection(LPP) manifold learning algorithm is presented, and the incremental learning principle of algorithm is introduced. For incremental sample data, the adjacency and covariance matrices are incrementally updated by the existing samples; then the dimensionality reduction results of the incremental samples are estimated by the dimensionality reduction results of the existing samples; finally, the dimensionality reduction results of the incremental and existing samples are updated by subspace iteration method. The adaptive neighborhood incremental PCA-LPP manifold learning algorithm is applied to processing of gearbox fault signals. The dimensionality reduction results by incremental learning have very small error, compared with those by batch learning. Spatial aggregation of the incremental samples is basically stable, and fault identification rate is increased.

摘要：木材干燥过程中会产生一系列有机挥发性气体(VOCs),这些气体对人体和环境都会带来巨大的危害。加强对木材干燥过程中产生VOCs的释放过程、释放控制和吸附的研究,即寻求环保高效的吸附剂是当前国内外研究的热点之一。在总结活性碳、活性碳纤维、活性碳纳米纤维、分子筛和蒙脱石基介孔材料等对VOCs吸附研究的基础上,探讨了新型MOFs材料在木材干燥工业过程中释放VOCs的应用可行性和发展前景。

摘要：采用木质纤维素(LNC)与纳米蒙脱土(nano-MMT)插层复合制备出的LNC/nano-MMT复合材料作为吸附剂,进行了模拟含铜废水中Cu(II)的吸附和解吸实验。通过静态吸附实验,研究了含Cu(II)溶液的初始浓度、pH值、吸附温度和吸附时间对溶液中Cu(II)吸附效果的影响。结果表明:最佳的吸附条件是Cu(II)溶液初始浓度0.03mol·L-1,pH值4.9,吸附温度50℃,吸附时间60min时,吸附容量达到最大值322.56mg·g-1。准二级动力学模型能很好地描述其吸附过程,吸附等温线符合Langmuir模型。使用HNO3对LNC/nanoMMT复合材料进行解吸再生实验。结果表明:以0.1mol·L-1的HNO3作为解吸剂,解吸温度40℃,超声波解吸时间30min时最大解吸量可达到283.15mg·g-1。结合XRD、SEM和FTIR分析LNC/nano-MMT复合材料的吸附机制。吸附/解吸循环实验研究表明:LNC/nano-MMT复合材料重复使用4次时吸附量仍较高,是一种优良的可循环利用的高效吸附剂。

摘要：受新型冠状病毒肺炎疫情影响,学校的教学活动都转到线上进行。本文以天津大学“物理化学”课程为例,介绍了全线上教学的策略、过程设计与实施效果。通过进一步丰富线上教学资源、完善教学手段、实行全过程精细化管理,使得物理化学这门原本不太适合完全线上学习的课程,取得了满意的教学效果。学习过程中,学生的主体地位和教师的主导作用得以完美体现,获得的教学经验对于未来课程教学有很好的借鉴意义。

摘要：将沙柳木粉经稀酸预处理之后,以1-烯丙基-3-甲基咪唑氯盐(AMIMCl)为液化剂,98%浓硫酸为催化剂,进行单因素试验和正交试验,确定最佳工艺条件为:液化剂∶木粉为13∶1(质量比),反应温度为180℃,反应时间为5h,催化剂用量为1%(wt,质量分数)时,失重率最小为4.57%。同时采用FT-IR和SEM对液化产物的残渣结构和表面形貌进行分析。

摘要：为有效提高地下商业综合体内人群疏散效率,提出一种利用智能手机室内定位技术的实时引导策略。并以某地下商场为研究背景,运用人员疏散仿真软件Pathfinder对室内定位引导策略下的人员疏散开展模拟,研究了该疏散策略的有效性及影响规律。研究结果表明:室内定位引导可以有效提高地下商场内人员疏散效率,但引导比例存在50%的临界值,当引导比例大于50%后,疏散效率随引导比例的增加不再显著提高;疏散人员数量较小时,引导策略下疏散时间的降低幅度并不显著,而人员数量超过设计人数的70%后,疏散时间降低程度显著增加。该研究结果可为地下密集人群的疏散引导提供一种新型理念。