智能探针式蒸汽流量计的研制

本文介绍智能探针式蒸汽流量计的系统结构、原理、流量积算仪的功能及其实现方法，给出系统标定和测试的方法，提出该仪表的应用前景。     

嵌段共聚物偶联剂对玄武岩纤维增强聚丙烯复合材料的改性研究

玄武岩纤维(BF)增强聚丙烯(PP)复合材料体系中,引入了聚苯乙烯(PS)与聚丙烯酸羟乙酯(PHEA)的嵌段共聚物大分子偶联剂(PS-b-PHEA),以改善复合材料的界面性能。结果表明:通过嵌段共聚物PS-b-PHEA对复合材料改性,一方面能够使玄武岩纤维与PP基体具有良好的界面黏结,另一方面能够在界面处形成柔性层,松弛界面热应力,迅速分散外加载荷,吸收外力的能量,实现复合材料的增强增韧。     

Optimum FIR and IIR multistage multirate filter design

A theorem is introduced which is useful in deriving equivalent multirate filter structures. Frequency responses of multistage multirate filters are derived and defined by deriving their equivalent one-stage filters. A design principle is proposed to reduce filtering requirements at each stage and move the filter operations to low-sampling-rate stages and thus result in a lower arithmetic rate. Optimum FIR and IIR multistage multirate filter designs are developed based on this principle. The new design has a one-point passband specification for each decimator and/or interpolator stage resulting in a wider transition region and lower filter order. Examples are given to explain the design procedure, and comparisons are made to show the superiority of the new filters.     

稀有金属的致癌和抗癌功能及其作用机制

根据近几年来的有关文献,综述了部分稀有金属的致癌和抗癌功能及其作用机制.稀有金属离子主要通过(1)降低致癌因子的诱变性;(2)调节细胞的增殖与凋亡选择性抑制癌细胞生长;(3)调节机体免疫系统,激活机体免疫防卫功能;(4)拮抗肿瘤细胞内致癌因子的增长等起到预防和抑制癌症的作用.而金属致癌作用主要包括DNA损伤和细胞转化等负面的生物效应.     

MBR离线化学清洗的自动控制实现

依据MBR污染的原理及化学清洗的流程,设计了基于PLC的离线化学清洗流程控制系统,实现了离线化学清洗现场无人值守的自动控制。     

基于大气环流和海温场的降水组合预报模型

针对降水具有混沌性和随机性,准确进行长期降水预报难度高的问题,提出时变海温多极指数和因子预报意见指数,基于大气环流和海温场构建长期降水组合预报模型,以三峡水库流域为例进行了验证。结果表明：组合预报模型在三峡水库流域1961—2020年汛期的月降水预报中有较好的适用性,特别在6月和9月降水预报上表现优异;与多因子回归、随机森林数理统计模型和CFSv2、ECMWF system 4动力数值模型相比,该模型更为稳健、预报精度提高显著。     

再生核质点法模拟金属镦粗过程

介绍再生核质点法的基本原理及其在刚塑性可压缩材料体积成形中的应用,采用罚函数法处理边界条件,为使结果收敛于精确值,对积分过程采用积分修正和稳定化技术,采用Newton-Raphson方法使非线性方程线性化,对下一时间步工件的形状可以用更新的节点坐标计算,模拟了二维平面镦粗过程,模拟结果与实际变形情况相符,说明该方法的有效性。     

Well-oriented bioarchitecture for immobilization of chloroperoxidase on graphene oxide nanosheets by site-specific interactions and its catalytic performance

Chloroperoxidase (CPO) was immobilized on graphene oxide (GO) nanosheets via site-specific interactions of concanavalin (ConA) with saccharide groups on the CPO surface to make GO-ConA-CPO nano-architectonics. Enzymatic oxidative decolorization of malachite green was used to investigate the catalytic performance of GO-ConA-CPO. The GO-ConA-CPO showed high activity (based on the decolorization efficiency), i.e., 93.68% in 15 min. Moreover, GO-ConA-CPO showed better thermostability and remained higher activity against pH change and high concentrations of oxidant H₂O₂ compared with GO-CPO and the free enzyme. When incubated at 60 °C for 1.5 h, 63.02% of the activity of GO-ConA-CPO and 35.75% of GO-CPO remained compared with that at 25 °C, while free CPO remained only 8.46% in the same condition. The tolerance of GO-ConA-CPO to H₂O₂ improved from 2.5 to 6 mmol L^?1, and the suitable pH range enlarged from 2.5–3.0 to 2.0–4.5. After 8 cycles, the GO-ConA-CPO can keep 52% activity of that in the first run. The enzymatic kinetic constants indicated that introducing CPO into GO-ConA-CPO bioarchitecture improved the diffusion of reactants and products.