摘要：In order to improve the co nvenie nce and sensitivity of amphetamines drug testing and reduce the threat of drugs to humans,we have designed a QCM gas sensor to detect amine-containing *** sensing material is designed based on the chemical nature of amine *** sensing mechanism is derived from a reve rsible Schiff base interaction between the amino group of the drug and the carbonyl group of the novel calix[6]arene derivatives as well as the hydrogen bond interaction between amino group and *** new composite material was well characterized by different analytical techniques including 1 H nuclear magnetic resonance(1 H-NMR),fourier transform infrared spectroscopy(FT-IR),scanning electro nic microscopy(SEM),transmission electron microscope(TEM),Raman spectra,powder X-ray diffraction,*** sensing experiments were conducted by coating the composite onto quartz crystal microbalance(QCM)*** experimental results indicated that the novel calixarene derivatives and their GO complexes based on the design have excellent selectivity,high sensitivity and repeatability toβ-phenylethylamine.

摘要：以滴水湖景区为例,设计了一种适用于没有市电及下水管网环境的厕所系统,通过耦合太阳能发电系统、采光器件、通风装置、粪便存放收集设备、污水处理设备,使得厕所摆脱了对外界资源环境的依赖,做到了节能、环保,体现了生态的原则。

摘要：现代博物馆需要建立用展品讲故事的脉络,使展品与参观者之间产生联系,引导参观者的思考,使其收获共鸣和感动。本文列举了欧洲科技类博物馆中较为常见的三类"故事式陈列"典型案例并加以分析,尝试展现它们背后的展览策划思路,即重新诠释展品、重新诠释科技史人物、以及运用"小人物""小故事"展现"大时代""大主题"这三种编排故事的模式,以期为中国的博物馆展览设计思路提供借鉴。

摘要：为优化基坑降水总涌水量,求取各降水井的最优单井抽水量与最优降水井数,建立了基于目标函数法的基坑降水最优化模型。以河南省西霞院水利枢纽输水及灌区工程渠首倒虹吸段基坑降水工程为例,运用目标函数法建立了倒虹吸段基坑降水最优化模型,调用maTLAB优化工具箱对工程实例的倒虹吸段基坑降水模型进行优化求解,并采用GMS数值模拟软件对优化结果进行验证分析。优化与模拟结果表明:在满足基坑施工要求、保证周围环境安全的条件下,采用Fmincon函数和GA遗传算法优化结果分别比原抽排计划(3个月)减少总涌水量624300 m^(3)和546390 m^(3),对单井抽水量和井的数量方面也能进行合理优化。因此,采用目标函数法调用优化工具箱进行基坑降水优化设计是可行的,能取得很好的优化效果。

摘要：在双碳目标和铝代铜的趋势下,平行流微通道换热器应用于小型制冷系统已成为研究热点。针对微通道蒸发器存在的结霜问题展开综述,首先对传统水平翅片结构及其改进方案进行介绍,特别叙述针对结霜工况设计的竖插翅片微通道结构;然后分析微通道换热器结霜的仿真模型,并从微通道替代翅片管换热器、环境工况、结构参数、表面涂层的影响四个角度归纳现有的实验研究。为在产品中推广应用,未来仍需在结构上优化创新、研发有效的延霜涂层、应用其他抑霜技术,同时开发高精度的微通道结霜模型,制定完整的微通道换热器设计流程。

摘要：传统微通道换热器(MCHX)的排水性能较差,限制了其作为蒸发器使用。竖插翅片微通道换热器(VMCHX)凭借特殊的结构布置和排水设计,有替代MCHX的潜力,但目前研究较少且没有实际应用。本文以VMCHX为研究对象,使用XFlow软件模拟竖插翅片的排水过程,采用动态浸渍法测量并比较MCHX(扁管水平、扁管竖直)和VMCHX(裸铝、亲水、超疏水)的排水时间和持水量。结果表明,VMCHX在排水过程中大部分水顺着延裹侧向下排出,残留水相比于MCHX可减少47%;亲水涂层可使VMCHX的排水时间缩短17%,超疏水涂层可使残留水减小19%,且排水时间由569s缩短到6s,排水性能最佳。本文的研究结果可为VMCHX作为蒸发器使用提供参考。

摘要：第二代风管机多采用V型分段拼接换热器,其翅片形状和表面强化结构一般均匀分布,在非均匀风场下的换热能力无法充分发挥。设计一种应用于风管机的C型换热器,采用Taguchi方法分别对高低风速区的翅片表面强化结构进行优化设计;选取5种方案进行换热仿真,对桥缝区域进行排水仿真,最终确定最优方案进行整机测试。结果表明,低风速区桥宽1.4 mm,桥高0.6 mm,桥数为4,高风速区桥宽1.2 mm,桥高0.6 mm,桥数为2时性能最佳。表面强化结构分区处理、上下侧非对称布置以及管间距非等宽设计使得C型翅片强化传热结构与风场分布精准匹配,并且兼顾排水性能。优化后的C型换热器相比于V型,APF平均提高6.4%,换热器成本降低14.5%。

摘要：传统风管机常采用V型换热器,低矮风道内来流风速的非均匀分布导致其换热能力较弱。针对风管机的非均匀来流,基于翅宽分布与风速分布的非均匀匹配,设计了一种非等宽翅片C型换热器,通过仿真和实验对其换热能力进行计算和测试,对比C型和V型翅片的换热特性,分析来流温度、冷凝温度、风量大小和风速分布对换热的影响。结果表明:在非均匀来流下,当翅宽与风速分布的幂次方成正比时理论换热量最大;C型翅片换热面积与风速的匹配度优于V型翅片,不同分区的局部换热量较高,总换热量更大,在较宽的工况范围内换热提升均大于10%。

摘要：随着经济建设的快速发展，城市建设也在日新月异的发展和提高中。以优化建设项目的施工顺序，研编科学的施工组织总设计、施工图预算并实行施工考核，能够有效提高工程建设的速度、质量和安全，有力降低工程成本，实现可观的综合效益。

摘要：The donor-n-conjugated-acceptor （D-n-A） structure is an important design for the luminescent materials be- cause of its diversity in the selections of donor, n-bridge and acceptor groups. Herein, we demonstrate two examples of D-^-A structures capable to finely modulate the excited state properties and arrangement of energy levels, TPA-AN-BP and CZP-AN-BP, which possess the same acceptor and n-bridge but different donor. The investigation of their photophysical properties and DFT calculation revealed that the D-n-A structure with proper donor, n-bridge and acceptor can result in separation of frontier molecular orbitals on the corresponding donor and acceptor with an obvious overlap on the n-bridge, resulting in a hybridized local and charge-transfer （HLCT） excited state with high photoluminescent （PL） efficiencies. Meanwhile, their singlet and triplet states are arranged on corresponding moie- ties with large energy gap between T2 and T1, and a small energy gap between S1 and T2, which favor the reverse intersystem crossing （RISC） from high-lying triplet levels to singlet levels. As a result, the sky-blue emission non-doped OLED based on the TPA-AN-BP reached maximum external quantum efficiency （EQE） of 4.39% and a high exciton utilization efficiency （EUE） of 77%. This study demonstrates a new strategy to construct highly effi- cient OLED materials.