工业遗产社区转型建设发展之路—以南京江南水泥厂为例

江南水泥厂工业社区随着工厂发展兴衰，社区逐渐衰败，存在诸多问题。工厂被列为南京工业遗产保护风貌区后，其面临着将工业社区转变发展成为城市居住社区的挑战。该文通过对南京江南水泥厂社区的转型发展建设的探讨，寻求一条解决工业遗产社区的建设发展之路。     

Radio-Over-Fiber 16-QAM, 100-km Transmission at 5 Gb/s Using DSB-SC Transmitter and Remote Heterodyne Detection

By using a double-sideband suppressed carrier (DSB-SC) optical transmitter and a remote self-heterodyned (RSH) detection method, we experimentally and analytically proved the feasibility of a radio-over-fiber system using a 16-QAM signal at 5 Gb/s and 18 GHz, with a transmission distance of 100 km between a mobile service center and a base station. The transmission system performance was carefully analyzed by considering optical amplifier noise, fiber nonlinearity, phase noise, frequency response, and analog-to-digital converter (ADC) quantization noise. The 18-GHz, 16-QAM signal can be radiated from the base station to a remote antenna port without any upconverter, and the remote antenna port consists of a downconverter and high-speed digital signal processors (DSPs) to recover the 16-QAM signal. The high-speed DSP, which partially compensates the intersymbol-interference (ISI) and phase-noise-induced system penalties, was enabled by 20-Gs/s ADCs. The algorithms used in the DSP blocks were also described in details.     

XML技术分析

ＸＭＬ是在ＳＧＭＬ和ＨＴＭＬ基础上发展起来的新一代通用 性的标记语言,是一个一代Ｗｅｂ平台的关键技术。ＸＭＬ包括标记语言定义ＸＭＬ、格式语言定义ＸＳＬ和多边 接语言定义ＸＬＬ三个部分组成,文中对ＸＭＬ的整体技术结构以及三个基本组成部分的技术进行了深入的分析,可作为今后利用ＸＭＬ技术开发Ｗｅｂ应用的参考。     

Evidence for a Novel Antiviral Mechanism of Teleost Fish: Serum-Derived Exosomes Inhibit Virus Replication through Incorporating Mx1 Protein

Exosomes are associated with cancer progression, pregnancy, cardiovascular diseases, central nervous system-related diseases, immune responses and viral pathogenicity. However, study on the role of exosomes in the immune response of teleost fish, especially antiviral immunity, is limited. Herein, serum-derived exosomes from mandarin fish were used to investigate the antiviral effect on the exosomes of teleost fish. Exosomes isolated from mandarin fish serum by ultra-centrifugation were internalized by mandarin fish fry cells and were able to inhibit Infectious spleen and kidney necrosis virus (ISKNV) infection. To further investigate the underlying mechanisms of exosomes in inhibiting ISKNV infection, the protein composition of serum-derived exosomes was analyzed by mass spectrometry. It was found that myxovirus resistance 1 (Mx1) was incorporated by exosomes. Furthermore, the mandarin fish Mx1 protein was proven to be transferred into the recipient cells though exosomes. Our results showed that the serum-derived exosomes from mandarin fish could inhibit ISKNV replication, which suggested an underlying mechanism of the exosome antivirus in that it incorporates Mx1 protein and delivery into recipient cells. This study provided evidence for the important antiviral role of exosomes in the immune system of teleost fish.     

双面螺旋埋弧焊钢管的交流消磁

介绍了双面螺旋埋弧焊钢管交流消磁的原理及系统构成,有效地消除了钢管剩磁对X光工业电视检测的影响,且满足标准对管端剩磁的要求。     

PBA/PMMA乳胶微球凝聚过程研究

考察ＰＢＡ／ＰＭＭＡ乳胶在Ａｌ２（ＳＯ４）３存在下的凝聚过程发现,乳液表面张力发生从低到高的突变,粘度呈现最高极值点变化,电志率呈最低极值变化,ｐＨ值渐减,不同阶段的乳液,乳胶粒的凝并体系分数和乳胶粒径分布不同,≥５０％原胶粒子凝并时表面张力突变,全部凝并时粘度最大,凝聚是胶粒逐步凝并的过程,乳胶结构对凝集和凝结干样形态有影响,适度升温有利于乳胶粒的凝聚。     

Short communication: Pheromonicin-SA affects mRNA expression of toll-like receptors, cytokines, and lactoferrin by Staphylococcus aureus-infected bovine mammary epithelial cells

Pheromonicin-SA (Ph-SA) is a newly developed, engineered multidomain peptide that has a bactericidal effect against Staphylococcus aureus. The objective of this study was to characterize innate immune responses by Staph. aureus-stimulated bovine mammary epithelial cells (BMEC) following treatment with Ph-SA. Primary BMEC from one lactating Holstein cow were isolated and exposed to Staph. aureus for 2 h, and then treated with rifampicin or Ph-SA. Total RNA was isolated from BMEC at 0, 2, 6, 12, and 24 h postinfection, and the mRNA expression of selected genes, including toll-like receptor (TLR)2 and TLR4, IL-1β, IL-6, IL-8, tumor necrosis factor α (TNF-α), and lactoferrin, was quantified by real-time PCR. In the rifampicin group, increases in the expression of mRNA for TNF-α, IL-1β, IL-6, IL-8, and lactoferrin were observed at 6 h postinfection and in the expression of mRNA for TLR2 but not for TLR4 at 12 h postinfection. In the Ph-SA group, increases in the mRNA expression of TLR2, TNF-α, IL-1β, IL-6, IL-8, and lactoferrin were observed at 6 h postinfection, and an increase in TLR4 mRNA expression was observed at 24 h postinfection. At 24 h postinfection, the mRNA expression of TLR4, TNF-α, IL-1β, IL-6, IL-8, and lactoferrin was higher in the Ph-SA group than in the rifampicin group. In conclusion, Ph-SA might promote the expression of mRNA for TLR2, TLR4, the pro-in?ammatory cytokines IL-1, IL-6, and TNF-α, the chemotactic factor IL-8, and lactoferrin in Staph. aureus-infected BMEC. Moreover, Ph-SA may be of value as an antibiotic in promoting innate immune responses by Staph. aureus-infected bovine mammary epithelial cells.     

火药破碎对压力异常影响的数值模拟

根据火药破碎度与颗粒间应力的实验关系式，通过计算膛内火药床的颗粒间应力，直接获得不同时刻膛内不同位置的火药床的破碎度，分析了火药破碎对膛内循环过程的影响。指出火药破碎是产生异常压力甚至膛炸的主要原因。研究结果对膛内异常压力和膛炸机理分析以及装药设计均具有重要理论指导意义。     

Sol-gel derived fluoridated hydroxyapatite films

Fluoridated hydroxyapatite [Ca₅(PO₄)₃(OH)_xF_1−x] films have reasonably good bioactivity and stability in the body, they could behave better than hydroxyapatite films in medical applications. In this work, a sol-gel method was adopted to prepare fluoridated hydroxyapatite films on titanium alloy. Three kinds of fluorine-containing reagents CF₃COOH, HPF₆ and NH₄PF₆ were selected to add into mixed Ca(NO₃)₂-P₂O₅ ethanol solutions to form dipping sols. The dipping sol with CF₃COOH led to an apatite film in which fluorine could not be detected in EDS. While the dipping sol, with HPF₆ or NH₄PF₆, could result in fluoridated hydroxyapatite films. The incorporation of fluorine could be attributed to the reactions of both HPF₆ or NH₄PF₆ with the mixed Ca(NO₃)₂-P₂O₅ ethanol solution to form nano-sized CaF₂ particles, which in turn, react with other species to form fluoridated hydroxyapatite during the film formation at 600 °C. Among the three fluorine-containing reagents, HPF₆ was the best because its dipping sol was more stable and the resulting films had better morphology.     

共聚酰胺研究进展

本文对无规、嵌段和接枝共聚酰胺的研究进展进行了综述。