Proposed light sources for illuminating in Xuan paper and silk artwork with organic and inorganic pigments by evaluating color shifts in museum

Artworks based on Xuan paper or silk and painted by organic or inorganic pigments are highly responsive to light due to their materials and manufacturing technologies. They belong to the highest level of light responsive exhibits stipulated by International Commission on Illumination (CIE) and are vulnerable to fading and discoloration caused by radiation from light sources. The choice of light sources is the key of protection for artworks. It is indispensible and urgent to choose the lowest damage light sources according to the material characteristics of artworks. In this article, long-term irradiation of typical light sources on various substrates and pigments was used as experimental method, and CIE DE2000 color difference formula was used as the evaluation index. The laws of the influence of different light sources on the color change of various materials were obtained, and the relative damage coefficients of light sources were calculated. Finally, eight kinds of light sources suitable for illuminating responsive artworks with typical material combinations were proposed. However, there are some limitations in the study, because the ancient Chinese Xuan paper and silk used as experimental objects in the experiment are yellowish. Thus, the models derived in this article are not suitable for choosing reasonable display light sources for other works of art. However, suitable light sources for different materials could be obtained by the calculation method used in this article.     

关于高炉炉缸长寿的关键问题解析

 高炉长寿化是大型高炉发展的必然趋势,实现高炉长寿的关键在于弄清高炉侵蚀的根本原因。从高炉炉缸侵蚀机理、高炉炉缸象脚型侵蚀原因、高炉炉缸圆周方向侵蚀不均匀性、高炉冷却强度与冷却效率以及高炉炉缸维护技术等5个方面探讨了高炉长寿存在的共性问题,指出高炉炉缸炭砖损毁的本质是碳不饱和铁水对炭砖的溶蚀。具体结果表明,首先,高炉炉缸象脚型侵蚀最严重部位位于高炉炉缸死料柱的根部位置;其次,阐明了直接导致高炉存在不均匀侵蚀的主要原因在于冷却系统的冷却水量和送风系统的风量在高炉周向方向分配不均匀;然后,阐明了冷却系统的作用本质是降低耐火材料热面温度,并提出了高炉冷却强度指数及高炉冷却效率指数;最后,分析了采用无钛矿护炉和钛矿护炉两种模式的高炉炉缸维护技术。     

The Crosstalk of Adipose-Derived Stem Cells (ADSC), Oxidative Stress,and Inflammation in Protective and Adaptive Responses

The potential use of stem cell-based therapies for the repair and regeneration of various tissues and organs is a major goal in repair medicine. Stem cells are classified by their potential to differentiate into functional cells. Compared with other sources, adipose-derived stem cells (ADSCs) have the advantage of being abundant and easy to obtain. ADSCs are considered to be tools for replacing, repairing, and regenerating dead or damaged cells. The capacity of ADSCs to maintain their properties depends on the balance of complex signals in their microenvironment. Their properties and the associated outcomes are in part regulated by reactive oxygen species, which mediate the oxidation-reduction state of cells as a secondary messenger. ADSC therapy has demonstrated beneficial effects, suggesting that secreted factors may provide protection. There is evidence that ADSCs secrete a number of cytokines, growth factors, and antioxidant factors into their microenvironment, thus regulating intracellular signaling pathways in neighboring cells. In this review, we introduce the roles of ADSCs in the protection of cells by modulating inflammation and immunity, and we develop their potential therapeutic properties.     

新时代长江水资源开发保护思路与对策探讨

针对长江水资源开发保护中存在的主要问题,以及新时代长江经济带发展和长江大保护背景下面临的新要求,展开了专项分析研究。研究结果表明:正确把握长江水资源开发保护与水环境治理及经济社会发展之间的关系,是协调长江经济带发展与长江大保护的关键所在。根据研究结果,提出了应当以水环境改善为突破点的长江水资源、水环境、水生态以及水灾害等四水共治的思路;同时还提出了管理与技术、经济与法律及文化等多种手段相结合的针对长江水资源开发保护的对策和建议。     

浅谈桥梁深基坑挡土墙防护施工方案

本文根据该项工程实际情况和相关技术标准、水文地质特征,对施工准备、测量放线、基坑开挖、挡土墙施工、基坑监测等关键部分进行深入研究。     

由工程施工导致的自动化仪表失准案例分析

本文针对案例进行分析,提出一些刚投入使用的自动化仪表出现不合格现象,而这些不合格的原因不是出厂时就存在的,而是由于自动化仪表安装人员在安装过程中没有严格执行自动化仪表工程施工及质量验收规范和相应产品使用说明书的要求所导致的,是完全可以避免的。     

梅钢三烧结节能环保生产实践

梅钢三烧结建设投产于2004年,随着运行年限的增加,其原有装备条件及技术水平逐步不适应目前的能源环保要求。近几年,三烧结厂结合自身的发展需求,通过技术设备升级改造,采用节能环保新技术,如主抽变频技术、竖冷炉技术、循环流化床脱硫技术以及臭氧氧化脱硝技术等,使三烧结的节能环保水平得到了大幅提升,能耗水平下降到45.6 kg/t,烧结烟气经处理后排放指标SO₂浓度小于35 mg/m3、NO_x浓度小于50 mg/m3,粉尘浓度小于10 mg/m3,达到超低排放指标要求。     

整体式挤压油膜阻尼器对管道振动抑制试验

针对管道振动现象，设计了一种整体式挤压油膜阻尼器并分析其刚度影响规律。利用SAP2000软件模拟仿真阻尼减振效果。搭建二维门型管道振动试验台，在管道上安装整体式挤压油膜阻尼器，研究整体式挤压油膜阻尼器控制管道振动的影响规律。结果表明：整体式挤压油膜阻尼器安装在激振源处且与激振力平面平行时的减振效果最佳，较原始振动降幅达51.83%；安装在激振源处且与激振力平面垂直时的减振效果最差；安装两个整体式挤压油膜阻尼器减振效果优于安装一个整体式挤压油膜阻尼器；安装在激振源处的减振效果优于安装在远离激振源的效果。     

Renoprotective Angiographic Polymersomes

Computed tomography (CT) angiography is powerful for the diagnosis of vascular diseases. Unfortunately, this method usually requires a high dosage of iodinated contrast agents, which can lead to severe elevation of reactive oxygen species (ROS) levels within kidneys. This causes oxidative stress, apoptosis, and hence contrast-induced nephropathy (CIN), a leading cause of iatrogenic renal failure, especially for patients with renal insufficiency. Herein, a route is shown to circumvent such problems with the usage of rationally designed renoprotective angiographic polymersomes (RAPs) as blood pool CT contrast agents. RAPs are biodegradable nanoparticles prepared via self-assembly of poly(ethylene oxide)-block-poly(triiodobenzoic chloride-conjugated polylysine-stat-phenylboronic acid pinacol ester-conjugated polylysine) (PEO₄₅-b-P[(Lys-IBC)₄₅-stat-(Lys-PAPE)₁₅]). The key to the efficiency of such nanoparticles as renoprotective contrast agents arises from the rationally chosen repeat units: Lys-IBC exhibits a concentration-dependent X-ray attenuation capability and Lys-PAPE introduces an ROS-scavenging ability to the polymersome. The study shows that RAPs can reduce the risk of CIN in mice with kidney injury. Additionally, a 5-fold increase in angiographic live time is observed using RAPs, compared to commonly used iodinated small molecule contrast agents. In summary, a new strategy is proposed for the design of a renoprotective angiographic contrast agent that is capable of reducing the risk of CIN.