Unveiling the colour palette of Arraiolos carpets: Material study of carpets from the 17th to 19th century period by HPLC-DAD-MS and ICP-MS

Wool samples collected from thirteen Arraiolos carpets from the 17th–19th century belonging to the National Museum of Ancient Art (NMAA, Lisboa, Portugal) collection were analysed to identify the natural dyes and mordants employed in the traditional dyeing process, in a way to complement and improve actual knowledge on this rugs. Natural dyes were extracted from Arraiolos historical wool fibres using a mild extraction method, followed by high-performance liquid chromatography with diode array and mass spectrometry detection (HPLC-DAD-MS) for compound identification. Colourimetry was used to measure colour parameters in all historical samples. Quantification of mordants in the historical fibres was carried out by inductively coupled plasma-mass spectrometry (ICP-MS). Weld, indigo, spurge flax, brazilwood, madder and cochineal were identified as dye sources in the fibres. Alum was the most commonly used mordant, but the presence of iron and zinc was also detected in some darker samples. The use of madder and cochineal is not referred in the available historical dyeing recipes. This study also proved that the actual visual perception of these carpets is strongly affected by the natural dyes photodegradation, which was mostly unaccounted for before.     

披帛与丝路文化交流

披帛是通过丝绸之路传入中国的西亚文化,与中国服饰发展的内因相结合而流行开来的一种时世妆的形式。沿丝绸之路所发现的披帛,反映了丝绸贸易的活跃。敦煌、吐鲁番地区发掘的披帛与中原地区特别是唐长安地区出土的披帛几乎相同,属于同时代的产物,经历了一个相互继承、汲取而发展的过程。     

The effect of goal-setting prompts in a blended learning environment—evidence from a field experiment

Previous literature has shown that task-based goal-setting and distributed learning is beneficial to university-level course performance. We investigate the effects of making these insights salient to students by sending out goal-setting prompts in a blended learning environment with bi-weekly quizzes. The randomized field experiment in a large mandatory economics course shows promising results: the treated students outperform the control group. They are 18.8% (0.20 SD) more likely to pass the exam and earn 6.7% (0.19 SD) more points on the exam. While we cannot causally disentangle the effects of goal-setting from the prompt sent, we observe that treated students use the online learning platform earlier in the semester and attempt more online exercises compared to the control group. The heterogeneity analysis suggests that higher treatment effects are associated with low performance at the beginning of the course.     

“一带一路”2.0引领新型全球化

世界发展情势及解决"一带一路"问题的需要,催促我们要升级"一带一路",考虑2.0版。"一带一路"的2.0版较之于1.0版有三大超越:时间上,不是回到历史,而是走出历史;空间上,从经营欧亚大舞台到世界大格局,开创欧亚大陆时代2.0——陆海联通,海洋时代2.0——深海时代、北极、南美;自身发展上,从互联互通到万物互联——从"天地人"到"天地人海空网",秉承人机交互、天地一体,万物互联。开创21世纪人类新文明,引领新型全球化:(1)包容性全球化——让全球化无死角;(2)南方型全球化——从要外援到要投资;(3)联动型全球化——南北联动、陆海联动,打造人类命运共同体。     

论自然科学、社会科学、人文科学的三位一体关系

自然科学、社会科学和人文科学是人类科学体系中的三大主干门类,这三大科学门类之间相互差异和相对独立、呈三足鼎立之势,又相互依存和相互关联,共同组成了一个共生共荣、三位一体的整体科学系统。科学的这种三位一体关系要求我们在发展科学的过程中必须注意保持科学系统的整体优化和综合平衡,也即必须坚持和贯彻促使三大科学协调发展的基本原则。     

百色市道路和建筑施工扬尘大气颗粒物排放量估算及防治措施研究

利用2014年广西统计年鉴、百色市统计年鉴获取百色市道路和建筑活动水平,采取排放因子法来估算百色市扬尘源排放大气颗粒物PM10的量,结果显示:2014年百色市道路扬尘和施工扬尘排放大气颗粒物PM10分别达57006.00吨和3127.62吨。为提切实改善环境空气质量,提升人民群众的环境满意度,文章对控制道路扬尘和施工扬尘分别提出了防治措施。     

依托“一带一路”建设构建运动休闲产业新经济带研究

习近平主席提出"一带一路"的理念和经济发展战略规划,标志着我国经济发展以及外交事务进入了一个新的历史阶段,但从经济发展的角度看,这个理念把过去经济发展,特别是国家经济联系的点对点的模式拓展成为一个多方合作共赢的立体网状空间,这为新时期经济发展模式拓展了空间和思路。运动休闲产业作为中国的新型产业,过去对西方国家的依赖太重,这个并不受西方技术壁垒的产业之所以难称民族产业,原因在于西方产品与理念在我国市场上占据了先入为主的优势,"一带一路"建设为我国运动休闲产业的发展或者说起飞提供良好的契机,构建"一带一路"运动休闲产业经济带是我国运动休闲产业全面发展的重要基础。     

武术概念新论

概念是人们有关客观对象本质的认知,是理论思维的最基本单元和形式。武术的概念同样是人们认识、研究武术一个最基本的逻辑起点。文中首先对近五十年来所作出的几个武术定义进行了评述,然后依据逻辑学的要求对该概念进行释义,提出具有自身文化特征的技击之道是维系中华传统武术形成与发展的内在规定性,并延伸出了以技、身、性三者有机结合的基本价值体系,由此铸造了传统武术在历史上博大、深邃的文化景象。     

六盘水市野钟自然保护区黑叶猴生态及种群数量的春季调查研究

2004年4月3日至5月5日,笔者对黑叶猴进行了野外生态及种群数量调查研究,结果表明:(1)原野钟保护区内的黑叶猴仅有8群50只,其中包括1只当月生黄毛婴猴。猴群与1987年调查结果一样,但猴群个体数减少23只,主要是家庭成员减少;(2)保护区外围新发现7群59只,其中包括新增当月生4只黄毛婴猴;(3)黑叶猴的春季食物主要是被子植物的幼芽、叶和花;(4)野钟黑叶猴自然保护区应以黑叶猴分布及取食范围为依据,重新调整规划,建议下游从花嘎乡的底母村左侧河谷两侧到上游叉河北盘江两岸重新规划为黑叶猴自然保护区。     

浅析桥梁施工用电技术

本文介绍了桥梁施工用电技术中的前期方案确定、施工工艺以及后期维护，提出了在设计和施工中应引起注意的几个问题。