玉树抗震救灾精神与社会主义核心价值

玉树抗震救灾精神就是大爱同心、众志成城的民族精神,就是坚韧不拔、百折不挠的革命英雄主义精神,就是挑战极限、全心全意为人民服务的精神,就是感恩奋进、自力更生、艰苦奋斗的精神。玉树抗震救灾精神是社会主义核心价值的时代表达,彰显了社会主义核心价值体系的现实要求。     

浅论唐卡的美学特征及价值

唐卡是藏族文化中独具特色的绘画艺术形式,其风格细腻、精美、富丽,体现了精巧的艺术构思和高超的绘画技巧,唐卡本身具有色彩美、内涵美、意蕴美等特点。前人在这方面已经有所探讨,但欠具体、系统。本文在前人论述的基础上,对唐卡的美学特征和美学价值作以论述。     

Experimental determination of CePO4 and YPO4 solubilities in H2O–NaF at 800°C and 1 GPa: implications for rare earth element transport in high‐grade metamorphic fluids

Monazite (CePO₄) and xenotime (YPO₄) are important accessory minerals in metasediments. They host significant rare earth elements (REE) and are useful for geochronology and geothermometry, so it is essential to understand their behavior during the metasomatic processes that attend high‐grade metamorphism. It has been proposed that F‐bearing fluids enhance solubility and mobility of REE and Y during high‐grade metamorphism. We assessed this possibility by determining the solubility of synthetic CePO₄ and YPO₄ crystals in H₂O–NaF fluids at 800°C and 1 GPa. Experiments used hydrothermal piston‐cylinder and weight‐loss methods. Compared to the low solubilities of CePO₄ and YPO₄ in pure H₂O (0.04 ± 0.04 and 0.25 ± 0.04 millimolal, respectively), our results indicate an enormous increase in the solubility of both phosphates with increasing NaF concentration in H₂O: CePO₄ solubility reaches 0.97 molal in 20 mol.% NaF, and YPO₄ shows an even stronger solubility enhancement to 0.45 molal in only 10 mol.% NaF. The greatest relative solubility increases occur at the lowest NaF concentration. The solubilities of CePO₄ and YPO₄ show similar quadratic dependence on NaF, consistent with possible dissolution reactions of: CePO₄ + 2NaF =  CeF₂⁺ + Na₂PO₄^? and YPO₄ + 2NaF = YF₂⁺ + Na₂PO₄^?. Solubilities of both REE phosphates are significantly greater in NaF than in NaCl at equivalent salt concentration. A fluid with 10 mol.% NaCl and multiply saturated with fluorite, CePO₄, and YPO₄ would contain 1.7 millimolal Ce and 3.3 millimolal Y, values that are respectively 2.1–2.4 times greater than in NaCl‐H₂O alone. The results indicate that Y, and by extension heavy rare earth elements (HREE), can be fractionated from LREE in fluorine‐bearing saline brines which may accompany granulite‐facies metamorphism. The new data support previous indications that REE/Y mobility at these conditions is enhanced by complexing with F in the aqueous phase.     

The social value of culture: learning from revolutionary Cuba

As the tide turns against econometric calculations of cultural value, scope exists for careful reconsideration of the social value of culture. In Cuba after 1959, culture was placed at the heart of a society undergoing radical transformation. This article examines the socially orientated initiatives to which this revalidation gave rise. It shows that substantial changes were wrought in professional circles as art was acknowledged as a form of social production and remunerated accordingly. It also outlines the sustained efforts that were made to diminish the gap between creative intellectuals and the rest of society, by encouraging widespread appreciation of, and participation in, creative activity. This comprehensive programme was underscored by ideas around democratisation and emancipation that remain vital to contemporary discussions.     

Pre-Columbian Ring Ditches along the Yacuma and Rapulo Rivers,Beni, Bolivia: A Preliminary Review

Abstract

Pre-Columbian farmers built a variety of earthworks in the Llanos de Mojos, part of the Bolivian Amazon. Raised fields, canals, causeways, and mounds of various types in this region date to ca. 800 B.C.–A.D. 1600. In central Mojos, archaeological work was carried out along the Yacuma, a large west-bank tributary of the Mamoré River. Four ring ditches and two areas of associated raised agricultural fields were mapped. The Global Positioning System was used to document earthworks under the forest canopy which were analyzed within a Geographic Information System. Ceramic evidence is also included. The ring ditches in this study expand the known range of such earthworks in Mojos by 200 km. This revised distribution of ring ditches changes interpretations of the long-term history of Arawak speakers in Mojos and throughout Amazonia. While earthworks in Mojos clearly represent systems of intensive agriculture, they cannot be associated only with Arawak speakers or with Arawak languages.     

Guerilla art,social value and absent heritage fabric

There is extensive commentary on the role of unauthorised art, but little on the coincidence of heritage value and guerilla art. This paper analyses the relationship of the two in a 2007 statue which is a monument to a lost place for which there is no surviving historic fabric. The statue functions not just as a place of memory, but of guerilla art; a complex interplay has emerged between an official piece of government art and unsanctioned community performance. Growing heritage emphasis on social value over the previous dominance of original fabric suggests that the delight with which the statue has been greeted illuminates evolving heritage philosophy, monument language and the emergence of the importance of the heritage community especially for its potential performance value at a site. The dramatic contribution that the statue has made to the city has an impact on the fields of landscaping, planning, history and heritage.     

延安市农民收入可持续增长机制探析

近年来,延安市农民人均纯收入一直低于全国平均水平,城乡居民收入差距也不断扩大。为改变这一局面,延安市政府实施了生态移民工程,进行了农业产业结构调整。这些措施在一定程度上改善了农民的生活水平,但是,制约农民收入增长的根本性障碍仍然存在。只有促进高附加值农业的可持续发展、鼓励农村剩余劳动力的外出就业和使农村非农产业实现较快发展,才能建立起农民收入的可持续增长机制。     

房地产投资环境研究初探

在中国新的投资体制下,房地产投资决策的理性化和科学化已是大势所趋,但是作为投资决策依据之一的房地产投资环境研究还显得零碎而片面,因此迫切需要进行系统深入地研究。针对这一要求,本文论述了房地产投资环境的理论基石与理论背景,在此基础上对房地产投资环境进行了因素分析,建立了"多指标综合价值评定法"的评价方法,旨在为房地产投资环境研究提供科学的理论和可行的方法。     

论地理策划本质及实施要点

地理学和地理教育需要顺应国家经济发展的形式,在理论与实践层面不断创新,尤其是在应用层面将人文与自然要素结合起来,建立一个符合市场运作需求的综合理论体系。地理策划是策划人通过创新性思维和理念,发现、发掘、提升和实现地理系统要素价值的过程,是地理研究成果转化成价值的关键环节。它不仅包括区域性课题,还包括广泛的地理要素和地理事件的价值发现与创造过程。通过对地理策划关键问题的梳理,构建了地理策划的基本理论框架,以使地理学更直接地面向市场。