微型柔性热敏传感器阵列应用研究

边界层分离点检测是实现分离流主动控制的前提和基础，也是气动控制灵巧蒙皮系统研究的重点和难点。以流体边界层分离点检测技术为研究对象，以流体边界层分离点判定的风洞实验为验证目标，设计制作微型热敏传感器与聚酰亚胺柔性衬底，并首次利用微装配技术集成分立敏感元件与柔性衬底形成热敏传感器阵列。首先，采用分立元件通过表面贴装工艺来实现柔性微型热膜传感器阵列的集成，并研究该传感器阵列中敏感元件、柔性衬底的设计及传感器的排布。然后，在低速风洞实验中对传感器阵列的性能和传感器阵列输出信号采用统计量算法的方式进行处理判断，判定圆柱翼型的流体分离点位置。最后，对实验的结果所作的分析表明，该微型柔性热敏传感器阵列满足流体分离检测系统实时性、动态性的要求。     

微型热敏传感器的薄膜电阻设计研究

应用微型热敏传感器薄膜电阻的电阻温度系数设计方法,得到基于热敏电阻的电阻温度系数的计算和设计参数.结合针对流体壁面剪应力测量的应用要求,分析多晶硅和铂金属热敏电阻的优缺点,并且对试验电阻进行电阻温度系数和时间常数的分析计算,依据计算结果确定微型热敏传感器薄膜电阻的基体材料、薄膜材料和特征尺寸等参数,为微型热敏传感器的实际应用提供参考依据和分析方法.     

微型热敏传感器系统动态特性理论研究

通过分析用于检测流体参数的微型热敏传感器的工作原理，针对恒流和恒温驱动电路驱动的此类传感器组成的系统，提出了对微型热敏传感器系统动态特性分析的依据和计算设计方法。并且通过对一阶恒流电路驱动传感器系统的时间常数和二阶恒温电路驱动传感器系统的响应频率的计算和分析，得到基于MEMS技术的热敏传感器系统的时域、频域参数的计算和设计依据，为此类传感器的器件设计和性能分析提供了重要的参考依据。     

Cancer Cell Membrane‐Biomimetic Oxygen Nanocarrier for Breaking Hypoxia‐Induced Chemoresistance

The inadequate oxygen supply in solid tumor causes hypoxia, which leads to drug resistance and poor chemotherapy outcomes. To solve this problem, a cancer cell membrane camouflaged nanocarrier is developed with a polymeric core encapsulating hemoglobin (Hb) and doxorubicin (DOX) for efficient chemotherapy. The designed nanoparticles (DHCNPs) retain the cancer cell adhesion molecules on the surface of nanoparticles for homologous targeting and possess the oxygen‐carrying capacity of Hb for O₂‐interfered chemotherapy. The results show that DHCNPs not only achieve higher tumor specificity and lower toxicity by homologous targeting but also significantly reduce the exocytosis of DOX via suppressing the expressions of hypoxia‐inducible factor‐1α, multidrug resistance gene 1, and P‐glycoprotein, thus resulting in safe and high‐efficient chemotherapy. This work presents a new paradigm for targeted oxygen interference therapy by conquering hypoxia‐involved therapeutic resistance and achieves effective treatment of solid tumors.     

Virtual infrastructure mapping in software-defined elastic optical networks

Software-defined networking (SDN) enables efficient and scalable network virtualization, which allows infrastructure resources such as computing and networking resources to be abstracted and outsourced as a service. The SDN technologies can be extended to the optical transport networks to achieve an intelligent and flexible resource management, thus achieving high-capacity, low-cost, and long-reach optical transport networks. In this paper, we introduce an architecture for software-defined elastic optical networks and study the virtual infrastructure (VI) mapping problem with the objective of minimizing the blocking probability. We propose a set of efficient heuristic algorithms, among which the Network followed by Compute Load Balancing (NCLB) algorithm is a novel attempt to solve the VI mapping problem by provisioning the networking resource first followed by allocating the computing resource. Furthermore, we propose a modified version of NCLB, called Network Depth-based NCLB (ND-NCLB), which confines the VI mapping assignment in a small-range sub-network to further optimize the physical network resource consumption. Through comprehensive simulations in various scenarios, we demonstrate that the proposed ND-NCLB algorithm achieves the best performance in terms of blocking probability compared to the other algorithms in this work.     

基于内部热耦合精馏塔非线性wave模型的高纯控制

首先建立内部热耦合精馏塔（ITCDIC）的非线性波动降阶模型,并将非线性波动理论（wave）应用到ITCDIC控制问题中,实现一般模型控制（GMC）方案.与传统控制方案相比,基于波动理论的一般模型控制（waveGMC）不再采用ITCDIC的近似线性模型,更好地解决了高纯控制过程中的非线性问题,通过对波形的速度和位置控制能够在短时间内使系统达到稳定.苯-甲苯物系的实例研究表明,ITCDIC波动模型在高纯控制过程中能够精确反映ITCDIC的动态特征,waveGMC控制方案较传统控制方案更加稳定可靠.     

Control the polymorphism and morphology of calcium carbonate precipitation from a calcium acetate and urea solution

Two metastable calcium carbonate polymorphs, rod-like aragonite and spherical vaterite are selectively formed in this study. Aragonite rods were synthesized from a calcium acetate (Ca(AC)₂) and urea (CO(NH₂)₂) solution under a given condition. In contrast, the addition of polyacrylamide (PAM) and oleic acid results in the formation of spherical vaterite. The morphology, size and crystal structure were characterized by means of Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and X-ray diffraction (XRD). The results show that PAM and oleic acid can be used as additives to select the polymorph from aragonite and vaterite. The contact angle of the modified products reached 112.49°. We have succeeded in surface modification of particles in situ at the same time.     

烧结温度对WC-Co-Ti3SiC2硬质合金微观组织与力学性能的影响

以掺杂3.0%Ti₃SiC₂(质量分数)的WC-Co-Ti₃SiC₂硬质合金为对象,研究了烧结温度(1350～1470℃)对WC-Co-Ti₃SiC₂硬质合金中的Ti₃SiC₂分解产物和比例、微观组织及力学性能的影响规律与机制。结果表明：烧结温度的升高促进了WC-Co-Ti₃Si C₂硬质合金中Ti₃Si C₂的分解以及(W,Ti)C和WSi₂相的生成,同时导致WC晶粒尺寸逐渐增大。硬质合金的硬度随烧结温度的升高呈现出先增大后降低的趋势,而断裂韧性则逐渐下降。当烧结温度为1410℃时,WC-Co-Ti₃Si C₂硬质合金的致密性最佳(孔隙率仅为0.47%),其力学性能也较为优异,硬度与断裂韧性分别为20 348.328 MPa和10.15 MPa·m^1...     

"纯"建筑空间的疏散引导力研究——以走道入口为例

创建含有各种走道入口的虚拟实验场景,以疏散逃生游戏的形式对被试者的模拟逃生路径选择数据进行计算,找到走道入口对象对人流疏散引导力影响最为显著的三个变量及其权重值,由此对国内外逃生模型的最短路径假设进行修正。     

综放面巷道松散煤体自燃过程数学模型的建立

在煤炭自燃灾害中,松散煤体自燃占很大的比例,综放面松散煤体较多,发生自燃的危险性也较高。文中根据综放面巷道松散煤体所处位置、堆积形态、漏风动力、散热条件等总结出自燃的特点,并判断自燃危险区域,最终推导出综放面巷道松散煤体自燃过程的数学模型,对实际生产中预防巷道松散煤体自燃起到指导作用。