带隙性光子晶体光纤的应用

带隙型光子晶体光纤以其独特的性能、在各领域有着广泛的应用前景.文章阐述了这种光子晶体光纤在强激光传送、粒子传输、传感器和孤子压缩等方面的应用.     

3′5-Dimaleamylbenzoic Acid Attenuates Bleomycin-Induced Pulmonary Fibrosis in Mice

Idiopathic pulmonary fibrosis (IPF) is a chronic lung disease characterized by parenchymal scarring, leading progressively to alveolar architecture distortion, respiratory failure, and eventually death. Currently, there is no effective treatment for IPF. Previously, 3′5-dimaleamylbenzoic acid (3′5-DMBA), a maleimide, demonstrated pro-apoptotic, anti-inflammatory, and anti-cancer properties; however, its potential therapeutic effects on IPF have not been addressed. Bleomycin (BLM) 100 U/kg was administered to CD1 mice through an osmotic minipump. After fourteen days of BLM administration, 3′5-DMBA (6 mg/kg or 10 mg/kg) and its vehicle carboxymethylcellulose (CMC) were administered intragastrically every two days until day 26. On day 28, all mice were euthanized. The 3′5-DMBA effect was assessed by histological and immunohistochemical staining, as well as by RT-qPCR. The redox status on lung tissue was evaluated by determining the glutathione content and the GSH/GSSG ratio. 3′5-DMBA treatment re-established typical lung histological features and decreased the expression of BLM-induced fibrotic markers: collagen, α-SMA, and TGF-β1. Furthermore, 3′5-DMBA significantly reduced the expression of genes involved in fibrogenesis. In addition, it decreased reduced glutathione and increased oxidized glutathione content without promoting oxidative damage to lipids, as evidenced by the decrease in the lipid peroxidation marker 4-HNE. Therefore, 3′5-DMBA may be a promising candidate for IPF treatment.     

Alchemical Design of Pharmacological Chaperones with Higher Affinity for Phenylalanine Hydroxylase

Phenylketonuria (PKU) is a rare metabolic disease caused by variations in a human gene, PAH, encoding phenylalanine hydroxylase (PAH), and the enzyme converting the essential amino acid phenylalanine into tyrosine. Many PKU-causing variations compromise the conformational stability of the encoded enzyme, decreasing or abolishing its catalytic activity, and leading to an elevated concentration of phenylalanine in the blood, which is neurotoxic. Several therapeutic approaches have been developed to treat the more severe manifestations of the disorder, but they are either not entirely effective or difficult to adhere to throughout life. In a search for novel pharmacological chaperones to treat PKU, a lead compound was discovered (compound IV) that exhibited promising in vitro and in vivo chaperoning activity on PAH. The structure of the PAH-IV complex has been reported. Here, using alchemical free energy calculations (AFEC) on the structure of the PAH-IV complex, we design a new generation of compound IV-analogues with a higher affinity for the enzyme. Seventeen novel analogues were synthesized, and thermal shift and isothermal titration calorimetry (ITC) assays were performed to experimentally evaluate their stabilizing effect and their affinity for the enzyme. Most of the new derivatives bind to PAH tighter than lead compound IV and induce a greater thermostabilization of the enzyme upon binding. Importantly, the correspondence between the calculated alchemical binding free energies and the experimentally determined ΔΔG_b values is excellent, which supports the use of AFEC to design pharmacological chaperones to treat PKU using the X-ray structure of their complexes with the target PAH enzyme.     

混合型硅溶胶的制备及在电动助力车用蓄电池中的应用

以气相二氧化硅为原料,将胶体电解剂中占总量50%以上的SiO2与KOH反应,生成K2SiO3溶液,而将其余的SiO2采用机械搅拌方法分散于其中,配制成混合硅溶胶。这种硅溶胶兼有两种胶体的优点。实现人为主动调节胶体颗粒大小分布和胶体电解剂性能。混合胶体应用于6DZM10电动助力车用蓄电池,能满足0.85C10大电流放电使用条件,电池经100%DOD大电流充、放电循环,寿命达到300次以上。     

300 MW机组直接空冷系统凝结水过冷却分析

以包头市第二热电厂300 MW直接空冷系统为例,分析了凝结水过冷却的原因,主要有凝结水回水被外界空气冷却、真空严密性差以及补充水溶氧和补水方式的影响等,提出加装保温、雾化喷嘴和改进补水方式等减小冷却度的措施.     

基于SVPWM的双馈风力发电系统仿真

在RTDS环境下构建基于SVPWM（空间矢量脉宽调制）的双馈型异步发电机及控制系统的仿真模型．其控制回路中所包含的矢量控制能够跟踪最大风能,从而获取最大能量。仿真1个容量为1．5MW双馈风力发电系统．发电机功率因数和直流电压具有可控性,发电机输出有功功率、无功功率能够解耦控制,试验结果验证了系统的控制特性良好。     

Deterministic and stochastic assessment of the harmonic currents consumed by discharge lamps

The paper examines the deterministic and stochastic behavior of magnetic ballast discharge lamps. Expressions to deterministically calculate the harmonic currents of discharge lamps are provided and analytical expressions of the probability density functions of these harmonic currents are obtained. The results are validated with experimental measurements.     

绿色生态法治理火力发电厂灰场扬尘

针对国电双鸭山发电有限公司储灰场扬尘问题,阐述了覆土造田法、喷淋法、无纺布法、表面固化法、灰场种植法等储灰场治理方法,通过比较,发现灰场种植法即＂生态林＂防尘固灰效果好,实施简单,维护量少,有效地治理了灰场扬尘,改善了周边环境。     

AV45-12型轴流式高炉鼓风机的冗余控制

主要介绍轴流式高炉鼓风机的防喘振控制、定流量/定风压控制以及逻辑联锁控制。本系统采用了Modicon Quantum高端PLC冗余控制,提高了系统的可靠性,在控制水平和确保炉况顺行等方面迈上了一个新的台阶。