基于序列关联的参差信号分选算法

针对复杂环境下常规直方图信号分选算法对于参差信号分选能力不佳的问题,该文提出一种基于脉冲间隔与单个脉冲关联的直方图算法。该算法根据脉冲间隔与单个脉冲的对应关系建立了脉冲间隔分布矩阵(PIDM),然后通过对PIDM行列的累加计算,得到一种新的直方图,该直方图可避免传统脉冲重复间隔(PRI)变换算法在分选参差信号时对于参差...     

Study on Laboratory Method for Refining of SR Diesel Fuel

The method for refining the straight-run diesel fuel was studied in laboratory scale in order to make the acid number of diesel fraction comply with the standard while removing the naphthenic acids contained in diesel without causing environmental pollution. After comparing the effect of refining using three solvents, the isopropyl alcohol-HOA was specified as the best solvent. Meanwhile, the relationship between the acid number of diesel fraction and the amount of solvent used and the relationship between the concentration of solvent and temperature and the stability of diesel in terms of its acid number were also investigated. Experimental results had shown that when the mass fraction of the HOA-IPA solvent was 20% at a dosage of 17 mL of the solvent and a temperature of 30℃, the acid number of the refined diesel fraction was 0.015 mg KOH/g with a good stability of acidity in the diesel fraction,     

Airway Smooth Muscle Cell Mitochondria Damage and Mitophagy in COPD via ERK1/2 MAPK

Chronic obstructive pulmonary disease (COPD) is characterized by irreversible deterioration of the airway wall. Cigarette smoking is the major trigger, and in vitro studies showed that cigarette smoke extract (CSE) induced mitophagy in airway epithelial cells via oxidative stress, but this mechanism was not studied in airway smooth muscle cells (ASMCs). Primary ASMCs isolated from COPD patients or non-disease donors were investigated for CSE-induced remodeling and mitochondria structure. Proteins were assessed by Western blots for remodeling: collagen type-I, α-smooth muscle actin (α-SMA) and fibronectin; autophagy: beclin-1, protein62 (p62), light chain (LC)3A/B; mitochondria activity: mitochondrially encoded cytochrome c oxidase II & -IV (MTCO2, MTCO4), peroxisome proliferator activated receptor gamma coactivator 1α (PGC-1α); lysosomes: early endosome antigen 1, lysosome activated membrane protein 1; and cell signaling: extracellular signal regulated kinase (ERK1/2). Lysotracker and Mitotracker were used to monitor mitochondria morphology and organelle co-localization. Compared with controls, untreated COPD ASMCs showed lower collagen type-I and α-SMA expressions, but increased fibronectin levels. CSE further downregulated collagen type-I and α-SMA expression, but upregulated fibronectin. CSE decreased PGC-1α, MTCO2, and MTCO4, but increased beclin-1, p62, and LC3. CSE upregulated mitophagy and lysosomes activity via ERK1/2 phosphorylation. In vitro, cigarette smoke induced the deterioration of ASMCs, which might explain the tissue loss and structural remodeling in COPD bronchi. The results suggest that preventing exceeded mitophagy in ASMCs might present a novel therapeutic target for COPD.     

钢框架预应力节点的介绍与分析

介绍了一种新的钢框架节点——预应力钢结构节点，该节点在顶底角钢连接的节点中增设了钢拉杆。钢拉杆与梁平行，并通过张拉钢拉杆使梁柱间产生预压力。试验研究表明：在往复荷载下，该节点的耗能由顶底角钢的非弹性变形提供，而钢拉杆和梁柱均保持弹性。该节点的主要优点是（1）拥有自定心（self—centering）的能力从而大大减小了在地震后的残余变形；（2）初始刚度较大与全焊接节点相似：（3）地震下破坏集中在节点的角钢处，地震后可以较方便地通过更换节点处的角钢来修复节点。     

粉煤灰负载壳聚糖吸附剂处理水中Cr(Ⅵ)的研究

将粉煤灰与壳聚糖复合得到一种负载吸附剂,研究了其对水溶液中Cr(Ⅵ)的吸附,详细探讨了固体吸附剂吸附Cr(Ⅵ)的最佳工艺条件.结果表明,该吸附刺对Cr<Ⅵ)具有较好的吸附性能,最佳吸附条件是:温度为25℃,pH=5,Cr(Ⅵ)初始质量浓度为20mg/L,吸附剂用量为10g/L,吸附时间为1h,Cr(Ⅵ)的去除率可以达到90%以上.     

聚丙烯共混物的形态结构与性能研究进展

从聚丙烯与其共混组分的相容性和结晶性的角度出发，综述１９９２年国内关于聚丙烯共混物的形态结构研究及形态结构与聚丙烯共混材料性能的关系。     

掘进机截割头动载荷变化规律的研究

掘进机截割岩石时,需要根据不同的岩层地质条件选择合适的截割头,并调整截割参数。在MATLAB中进行动态仿真模拟,深入研究截割头载荷的变化规律。结果表明,截割头载荷随着截割头截深、截割转速、摆速或钻进速度和截割岩石硬度的不同而发生变化。为截割头的选择和截割参数的调整提供了可靠的依据。     

常减压塔顶用油溶性缓蚀剂的室内评价

设计了一种简便的常减压塔顶油溶性缓蚀剂室内评价方法,对四种商业化的油溶性缓蚀剂进行了评价,分别对缓蚀率、腐蚀挂片的表面光泽、挂片后腐蚀溶液的p H值进行了对比。研究发现,随着缓蚀剂加注量的增加,缓蚀率先增加,然后基本维持不变或略降低。有较高缓蚀率的缓蚀剂,其腐蚀挂片表面呈现金属光泽,且腐蚀后的腐蚀液p H值较低。经综合评价,HYH-011的缓蚀效果最好,缓蚀率达到94%,实践证明,该室内评价方法准确可行。     

Experimental Study of a Thermoelectric Generation System

A flat wall-like thermoelectric generation system is developed for applications in exhaust heat of kilns. The design of the whole experimental setup is presented. The essential performance of the thermoelectric generation system is tested, including open-circuit voltage, output power, and system conversion efficiency. The results illustrate that, when heat source insulation is not considered, the system conversion is efficient at hot-side temperatures between 120°C and 150°C. In addition, the nonuniformity of heat transfer is found to significantly affect the power-generating ability of the system. System-level simulation is carried out using a quasi-one-dimensional numerical model that enables direct comparison with experimental results. The results of both experiment and simulation will provide a foundation to improve and optimize complex thermoelectric generation systems.