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关键词： Perovskite  

摘要： Using time-domain density functional theory and nonadiabatic (NA) molecular dynamics, we demonstrate that interfacial interaction between WS2 and CsPbBr3 quantum dots (QDs) determines the band alignment, leading to a type-II and type-I heterojunction for the WS, contacting with Cs/Br- and PbBr2-terminated facet QD, respectively. In the type-II heterojunction, electron transfer is faster than hole transfer arising due to the stronger NA coupling, higher density of electron acceptor states, and more and higher phonon modes involved. Both the electron and hole transfer times are subpicosecond, in agreement with experiments. The energy lost by the electron and hole is slower than charge transfer by several times, facilitating keeping charge carriers sufficiently "hot". Particularly, the electron-hole recombination occurs over 1 ns, favoring a long-lived charge-separated state. Detailed atomistic insights into the photoinduced charge and energy dynamics at the WS2/QD interface provide valuable guidelines for improving performance of perovskite/transition-metal dichalcogenide solar cells.

关键词： Incident light  

摘要： Metasurfaces can manipulate optical wavefronts by locally shifting the phase of incident light with metallic or dielectric optical nanoresonators that are generally arranged on a lattice with subwavelength spacing. However, such conventional metasurfaces inevitably generate a spatially discrete multi-level phase profile due to the spacing of their building blocks. This directly leads to an efficiency reduction and thus limits their capability. Here, we propose and demonstrate highly efficient transmissive metasurfaces with the ability to form a continuous phase profile. The proposed strategy relies on the fact that high-index dielectric nano beams with gradually modulated widths can be interpreted to be a virtually impedance-matched material with spatial variations of its refractive index. By highly utilizing such features, one-dimensionally continuous, arbitrary phase profiles can be created in a simple manner with the width profile design. Since spatial transmittance variations can be minimized due to the impedance matching feature, this approach provides a nearly ideal phase profile for spatial light modulation with phase-only filtering operations. We demonstrate that this approach has the capability to improve the performance in various metasurface-based optical components, including polarization-dependent, large-angle beam deflectors and versatile multi-beam splitters. Considering that designing optical phases even in deep-subwavelength regimes is critical for free-space optics, the proposed approach will enable new classes of optical components with complex wavefront engineering.

关键词： Vibrated gas-fluidized bed   fine coal   multistage separation   dry beneficiation  

摘要： In this study, multistage separation processes were introduced into fine coal beneficiation in a vibrated gas-fluidized bed in order to improve the separation performance. The changes of coal properties, operational parameters, and density segregation characteristics during multistage separation were systematically studied. The results showed that with an increase in the separation stage, the range of density was narrowed down and the required input energy decreased. The results showed that with the same yield, the ash content of clean coal decreased from 12.53% for single separation stage to 8.91% for three separation stages, indicating a significant improvement on separation accuracy.

关键词： 生物分离工程   评价   考核方式  

摘要： 长江师范学院正按照"发展品质上新台阶、教育质量上新水平、学科建设有新成就、体制机制有新面貌"的"四新"要求,建设高水平应用型大学。面对当今社会高新技术产业对人才的需求,培养集知识、建设、管理、创新等为一体的高级专业技术人才是开展"应用型人才教育"的根本出发点。"应用型人才"的特点是基础知识扎实、市场洞察力敏锐、综合分析及创新能力强,可以服务于生产和管理第一线的高级专业人才。

关键词： 制药工程   制药分离   技术  

摘要： 现如今社会经济不断发展,国民生活品质不断提升,我国也开始更加深入地研究各个领域,其中包括制药行业。制药工程的发展关系国民的身体健康,人们对自身健康问题的关注度越来越高,受到环境污染、农药残留等诸多问题的影响,国民对医药价值提出了更高的标准要求。不过现如今我国制药工程在发展中仍然存在一些不足,需要进一步提升制药工程技术水平,更好地解决现实问题,提高我国医疗水平,保证用药安全。

关键词： 生物工程专业   生物反应工程   教学改革  

摘要： 生物分离工程是生物工程专业的必修课,是生物产品商业化和产业化的关键,与实践联系紧密,同时需要相关学科作为支撑。笔者在教学过程中发现,学生对知识的综合运用存在问题,理论联系实际的能力较差,课堂授课效果不理想。针对上述问题,笔者分析原因并提出改革方法。

关键词： 膜分离   净化工艺   环保工程   水资源   污染治理  

摘要： 文章在对膜分离净化工艺在环保工程中的运用效果做出讨论的基础上,对其技术的未来发展趋势也作出了初步的评估。高超的工艺技术成果可以展示出当今环保事业发展的理想状态,并给如今环保工作的实施提供出有力的技术方法依据。伴随着当今环保事业发展要求的不断严格化,对环境工程净化技术也提出了更为严格化效果要求,同时可有力推进着膜分离净化工艺的快速健康发展。

关键词： Location optimization   Computational topology   Spatial meshing   Dynamic route   Heuristic approach  

摘要： The layout of industrial construction projects is crucial in meeting production requirements while minimizing operational costs. The purpose of this study is to answer the question of whether the proposed discrete block model and spatial meshing (DBSM) algorithm can improve transportation efficiency and reduce total direct transportation costs. The DBSM algorithm was implemented in 20 different investigation scenarios that considered the uncertainty in the model variables for a construction materials production company based on its geological, transportation, and production data. These analytical scenarios varied the grid sizes of spatial meshing, vertical distance of computational topology blocks, and practical transportation distance at each dimension increment throughout the initial design and planning period. The algorithm was then validated by statistically comparing its performance with that of a contemporary location-selection model that does not consider three-dimensional (3D) spiral transportation routes and differential material quality while maximizing the model performance. The DBSM algorithm outperformed the existing model due to its ability to select an optimized location. The algorithm resulted in a reduced total weighted sum of distances (WSD) for all trucks and an annual savings of 1.62% on direct transportation costs. This research contributes a new method that integrates spatial block modeling and location meshing to solve the construction-materials stationary plant site-selection problem with uncertain routes and dynamic loading points. It is an effective and practical method of location optimization for real-world production problems.