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宋代诗人的“观物化”书写及其自然观 被引量:4
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作者 王萧依 《中南大学学报(社会科学版)》 CSSCI 北大核心 2021年第6期167-176,共10页
宋代诗人常以“观物化”来概括其观察、体验、描写自然万物变化的精神活动和创作实践。他们在“天人合一”思想的基础上融会儒、释、道诸家思想,构建了一种尊重自然变化规律并以之为自然宇宙和人文社会最高理想的自然观。同时,锻炼出与... 宋代诗人常以“观物化”来概括其观察、体验、描写自然万物变化的精神活动和创作实践。他们在“天人合一”思想的基础上融会儒、释、道诸家思想,构建了一种尊重自然变化规律并以之为自然宇宙和人文社会最高理想的自然观。同时,锻炼出与之相对应的观察自然、体悟人世的日常实践工夫,平等地赋予曾被轻视的自然物和创作技巧以崇高的意义。宋代诗人在观照自然、审视自我的过程中沟通了自然观与人生观,对物我关系这一古典诗歌中的重要思想命题进行了新的理解与诠释。 展开更多
关键词 宋诗 观物化 自然书写 自然 物我关系
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庄子物化文学观初探 被引量:2
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作者 何光顺 《重庆师范大学学报(哲学社会科学版)》 2004年第2期48-53,共6页
“文源于道”是一个古老命题。根据对“道”的不同理解 ,各家形成了其相应的文学观。本文在比较易学、儒学、老庄“道”论的基础上 ,指出庄子文学观的特质是根于无为、虚静的“境界”之“道” ,是源自动静与天地同流的“大化”之“道”... “文源于道”是一个古老命题。根据对“道”的不同理解 ,各家形成了其相应的文学观。本文在比较易学、儒学、老庄“道”论的基础上 ,指出庄子文学观的特质是根于无为、虚静的“境界”之“道” ,是源自动静与天地同流的“大化”之“道”。道“化”生万物 ,万物“化”而入道 ,就是“物化”。在道的物化背景下观照文学 ,就形成了庄子独特的“物化文学观”。物化文学观 ,重视文学的道缘与化境 ,破解文学的僵滞与现成。文学缘道而生 ,向道而化的本质决定了其重化、求真、尚正的本真品格。这也构成了庄子“物化”文学观与儒家“尚用”文学观及老子“法自然” 展开更多
关键词 庄子 物化文学 “道” 人性精神 自然
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论教师的学生观与师生关系 被引量:5
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作者 邓凤玭 《湖南师范大学教育科学学报》 2006年第4期47-48,109,共3页
在传统教育中,教师总是把学生看作对象化的客体,持一种物化的学生观,学生只会服从,不会思考,更不会创新。无疑,这样的学生观,不适于当今的时代。创新教育要求教师把学生当作活生生的人,尊重学生,激活学生的思考意识、创新意识,坚持人化... 在传统教育中,教师总是把学生看作对象化的客体,持一种物化的学生观,学生只会服从,不会思考,更不会创新。无疑,这样的学生观,不适于当今的时代。创新教育要求教师把学生当作活生生的人,尊重学生,激活学生的思考意识、创新意识,坚持人化的学生观。这是一种相互尊重、相互交融的师生关系。创新教育的实施需要人化的学生观和相互体验、交融的师生关系。 展开更多
关键词 传统教育 创新教育 物化的学生 人化的学生 师生关系
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物化资本观及其哲学基础——基于《1844年经济学哲学手稿》的考察
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作者 刘恩至 《当代经济研究》 北大核心 2024年第3期61-69,共9页
《1844年经济学哲学手稿》的资本观囿于“物化”理论,总体而言是一种“物化资本观”。一方面,青年马克思把资本泛化为具有牟利功能的“物”,因而认为货币等存在物天然就是资本;另一方面,他虽然尝试深入到“资本—劳动”的社会关系之中,... 《1844年经济学哲学手稿》的资本观囿于“物化”理论,总体而言是一种“物化资本观”。一方面,青年马克思把资本泛化为具有牟利功能的“物”,因而认为货币等存在物天然就是资本;另一方面,他虽然尝试深入到“资本—劳动”的社会关系之中,并据此写下了资本的三条定义,但这一探索仍未触及资本在生产关系维度的核心内容,最终陷入难以自洽的理论困境。究其原因,在于青年马克思尚未摆脱费尔巴哈的影响,人本主义哲学方法使马克思秉持“人—物”对立的思维范式,资本作为人的自由本质的对立面势必表现为僵死的物,并且,只有作为死物的资本才是根本上亟待被批判和扬弃的。当然,在物化资本观的主旋律下,马克思也注意到了资本作为社会关系特别是权力—支配关系的内容,这一潜在的视角为其资本观在之后的革命性变革埋下了伏笔。 展开更多
关键词 物化资本 生产关系 人本主义 1844年经济学哲学手稿
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卢卡奇早期法哲学观初探
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作者 龚廷泰 季金华 《学习与探索》 CSSCI 北大核心 2005年第6期94-99,共6页
卢卡奇的《历史和阶级意识》蕴涵着丰富的法哲学思想。他以物化、总体性、阶级意识、主客体的统一等概念范畴表述对马克思主义的理解,并集中分析物化及物化意识与资本主义法律形式化之间的内在关联,考察法律现象与其他社会现象的互动关... 卢卡奇的《历史和阶级意识》蕴涵着丰富的法哲学思想。他以物化、总体性、阶级意识、主客体的统一等概念范畴表述对马克思主义的理解,并集中分析物化及物化意识与资本主义法律形式化之间的内在关联,考察法律现象与其他社会现象的互动关系,阐述法律现象的功能和作用,系统表述自己的总体性的法学辩证法观点。同时,他从实践哲学层面深入阐发人的主体性历史地位,力图从逻辑上确证阶级是包括法律现象在内的社会现象发展的历史推动力量。 展开更多
关键词 卢卡奇 物化论的法哲学本体 总体性的法哲学辩证法 主体性的法哲学发展
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论庄子生命观
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作者 慈秀秀 《湖北函授大学学报》 2015年第14期61-62,共2页
人有生,即有死,世人都无法脱离生死的羁绊。人只有一死,如何面对死亡,这是一个问题。庄子的生命观中的苦生顺命、生死物化以及乐死的观点独到而深邃、冷静而深情、超越而现实,具有极强的吸引力和巨大的感染力。研究他的生命观,对当今的... 人有生,即有死,世人都无法脱离生死的羁绊。人只有一死,如何面对死亡,这是一个问题。庄子的生命观中的苦生顺命、生死物化以及乐死的观点独到而深邃、冷静而深情、超越而现实,具有极强的吸引力和巨大的感染力。研究他的生命观,对当今的世人具有极大的启示作用。 展开更多
关键词 苦生顺命 生死物化 乐死
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New Macroalgal Fossils from Middle Cambrian Kaili Biota in Guizhou Province, China 被引量:5
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作者 杨瑞东 毛家仁 赵元龙 《Acta Botanica Sinica》 CSCD 2001年第7期742-749,共8页
Abundant and well-preserved remains of noncalcareous algae and soft-bodied metazoans were collected from Middle Cambrian Kaili biota in Taijiang county, Guizhou Province, China. These remains provide further evidence ... Abundant and well-preserved remains of noncalcareous algae and soft-bodied metazoans were collected from Middle Cambrian Kaili biota in Taijiang county, Guizhou Province, China. These remains provide further evidence for the wide geographic distribution of many Burgess Shale taxa. Among the algae, 5 genera (including two new genera) and 5 species are described. They are Marpolia spissa Walcott, Acinocricus stichus Conway Morris and Robison, Udotealga erecta Yang, Eosargassum sawata Yang, and Rhizophyton zhaoyuanlongii Yang. Contrasting the macroalgal fossil assemblage in the Kaili biota with one in the Burgess Shale biota, it is clear that similarity of the Kaili biota and the Burgess Shale biota is reflected by the same content of not only the soft-bodied metazoans, but also the noncalcareous algae. 展开更多
关键词 Guizhou Province Middel Cambrian Kail biota MACROALGAE
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Phase transitions, micro-morphology and its oxidation mechanism in oxidation of ilmenite (FeTiO_3) powder 被引量:5
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作者 肖玮 鲁雄刚 +2 位作者 邹星礼 危雪梅 丁伟中 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第8期2439-2445,共7页
Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTi03 transforms to hematite and rutile when oxidation at 700-800 ℃, and pseudobrookite is formed w... Phase transitions, morphology changes, and oxidation mechanism of the ilmenite oxidation process were investigated. FeTi03 transforms to hematite and rutile when oxidation at 700-800 ℃, and pseudobrookite is formed when the oxidation temperature reaches 900 ℃. The initial ilmenite powder exhibits paramagnetism; however, after being oxidized at the intermediate temperature (800-850 ℃), the oxidation product exhibits weak ferromagnetism. The oxidation mechanism was discussed. The microstructure observations show that a lot of micro-pores emerge on the surfaces of ilmenite particles at the intermediate temperature, which is deemed to be caoable ofenhancin~ the mass transfer ofoxgen during oxidation. 展开更多
关键词 ILMENITE phase transitions MICRO-MORPHOLOGY oxidation mechanism
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Landscape patterns of overstory litterfall and related nutrient fluxes in a cool-temperate forest watershed in northern Hokkaido,Japan 被引量:1
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作者 徐小牛 柴田英昭 《Journal of Forestry Research》 SCIE CAS CSCD 2007年第4期249-254,共6页
Within a forested watershed at the Uryu Experimental Forest of Hokkaido University in northern Hokkaido, overstory litterfall and related nutrient fluxes were measured at different landscape zones over two years. The ... Within a forested watershed at the Uryu Experimental Forest of Hokkaido University in northern Hokkaido, overstory litterfall and related nutrient fluxes were measured at different landscape zones over two years. The wetland zone covered with Picea glehnii pure stand. The riparian zone was deciduous broad-leaved stand dominated by Alnus hirsuta and Salix spp., while the mixture of deciduous broadleaf and evergreen conifer dominated by Betula platyphylla, Quercus crispula and Abies sachalinensis distributed on the upland zone. Annual litterfall averaged 1444, 5122, and 4123 kg.hm^-2·a^-1 in the wetland, riparian and upland zones, respectively. Litterfall production peaked in September-October, and foliage litter contributed the greatest amount (73.4%-87.6 %) of the annual total litterfall. Concentrations of nutrients analyzed in foliage litter of the dominant species showed a similar seasonal variation over the year except for N in P glehnii and A. hirsuta. The nutrient fluxes for all elements analyzed were greatest on riparian zone and lowest in wetland zone. Nutrient fluxes via litterfall followed the decreasing sequence: N (11-129 kg.hm-2.aq) 〉 Ca (9-69) 〉 K (5-20) 〉 Mg (3-15) 〉 P (0.4-4.7) for all stands. Significant differences were found in litterfall production and nutrient fluxes among the different landscape components. There existed significant differences in soil chemistry between the different landscape zones. The consistently low soil C:N ratios at the riparian zone might be due to the higher-quality litter inputs (largely N-fixing alder). 展开更多
关键词 Landscape LITTERFALL Nutrient cycling Soil chemistry Temperate forest
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Directional solidification and characterization of NiAl-9Mo eutectic alloy 被引量:1
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作者 张建飞 沈军 +2 位作者 商昭 王雷 傅恒志 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第12期3499-3507,共9页
Ni-45.5Al-9Mo (mole fraction,%) alloy was directionally solidified with a constant temperature gradient (GL=334 K/cm) and growth rates ranging from 2 to 300 μm/s using a Bridgman type crystal growing facility wit... Ni-45.5Al-9Mo (mole fraction,%) alloy was directionally solidified with a constant temperature gradient (GL=334 K/cm) and growth rates ranging from 2 to 300 μm/s using a Bridgman type crystal growing facility with liquid metal cooling (LMC) technique. The effect of growth rate (v) on the solidified microstructures such as rod spacing (λ), rod size (d) and rod volume fraction was experimentally investigated. Two types of the solidified interfaces, planar and cellular, were identified. On the condition of both planar and cellular eutectic microstructures, the relationships between λ, d and v were given as: λv1/2=5.90 μm·μm1/2·s1/2 and dv1/2=2.18μm·μm1/2·s1/2, respectively. It was observed that the volume fraction of Mo phase could be adjusted in a certain range. The variation of phase volume fraction was attributed to undercooling increase and the growth characteristics of the individual constituent phases during the eutectic growth. 展开更多
关键词 NiAl-9Mo directional solidification INTERMETALLICS crystal growth MICROSTRUCTURE
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Landscapes Construction of Ecological, Cultural and Active Residential Districts with the Design of Longji Flower City as an Example
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作者 赵春仙 谢会成 戴绍祥 《Journal of Landscape Research》 2010年第2期33-35,38,共4页
With the accelerating development of modern residential districts and the improvement of living levels, the requirement of people on environment is increasingly enhanced as well as the demand for culture. Based on peo... With the accelerating development of modern residential districts and the improvement of living levels, the requirement of people on environment is increasingly enhanced as well as the demand for culture. Based on people-oriented principle, this design utilized Chinese 'Fu' (blessings) culture to express people’s eager for a better life and the atmosphere of good fortune. It also produced the image of ecological environment by designing water landscapes and plant landscapes, created active space like squares for activity and active water system and developed the characteristics of residential districts by designing landscape sketches and plant landscapes. 展开更多
关键词 Spatial organization Ecological culture Plant landscapes Green space planning
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Influence of Huizhou Culture on Plant Landscapes in Huizhou-style Gardens
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作者 余汇芸 温琦 《Journal of Landscape Research》 2010年第3期71-73,77,共4页
Huizhou-style gardens have been greatly influenced by Huizhou culture, their plant landscapes have also been integrated with various aspects of Huizhou culture, which demonstrated the ideology, historical and cultural... Huizhou-style gardens have been greatly influenced by Huizhou culture, their plant landscapes have also been integrated with various aspects of Huizhou culture, which demonstrated the ideology, historical and cultural connotation of the society in an abstract and impalpable way. In this study, Huizhou-style miniature landscapes, plants of virtual implications, flowers or fruit trees of special connotations are taken for examples to analyze the influence of Xin’an Neo-Confucianism on plant landscapes in Huizhou-style gardens, the demonstration of Huizhou businessmen’s aesthetic tastes, as well as folk cultures of Huizhou, which implies that plant landscapes in Huizhou-style gardens are those incorporating with humanistic spirits, ornamental and practical uses. This study aims to provide references for further researches in the present situation of ancient Huizhou areas, protection of ancient Huizhou-style gardens and construction of new-style Huizhou gardens. 展开更多
关键词 Huizhou culture Plant landscapes Xi’an Neo-Confucianism Aesthetic tastes of Huizhou businessmen Folk customs
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Preparation of tricalcium silicate and investigation of hydrated cement 被引量:3
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作者 TAN Yan-ni CHEN Wen-juan +1 位作者 LIU Yong LIU Yan-jun 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第11期3227-3238,共12页
Tricalcium silicate cement(TSC)has been widely used in dental materials because of its self-setting behavior,good bioactivity,biocompatibility,osteoinductivity,and antibacterial effect.Tricalcium silicate(C3S)powder w... Tricalcium silicate cement(TSC)has been widely used in dental materials because of its self-setting behavior,good bioactivity,biocompatibility,osteoinductivity,and antibacterial effect.Tricalcium silicate(C3S)powder was prepared by Pechini technique with a calcining temperature of 1300℃ for 3 h.The influence of liquid/powder(L/P)rate on the setting time and the mechanical property of TSC was studied.Characterization methods including XRD,FTIR,SEM-EDS,TEM,and ICP-AES were utilized to study the properties of C3S powder and its hydrated cement.The bioactivity and biocompatibility of the cement were investigated by soaking test and cell culture,respectively.The results show that the L/P rate plays an important role in the setting time and the compressive strength of TSC.The surface of TSC was covered by hydroxyapatite deposition during the immersion experiment and the cells attachment on the surface of TSC was well,which indicated that TSC has good bioactivity and biocompatibility.In addition,TSC has excellent antibacterial properties against Staphylococcus aureus.In conclusion,TSC is a promising candidate for root canal filling materials. 展开更多
关键词 tricalcium silicate powder chemical synthesis inorganic compounds MICROSTRUCTURE
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Effects of Topography and Land use on Woody Plant Species Composition and Beta Diversity in an Arid Trans-Himalayan Landscape, Nepal 被引量:5
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作者 Shishir PAUDEL Ole R VETAAS 《Journal of Mountain Science》 SCIE CSCD 2014年第5期1112-1122,共11页
Distribution patterns of plant species are believed to be impacted by small-scale habitat heterogeneity. However, there have been few comparative studies examining how woody vegetation composition and diversity varies... Distribution patterns of plant species are believed to be impacted by small-scale habitat heterogeneity. However, there have been few comparative studies examining how woody vegetation composition and diversity varies with aspects of different orientations in the Trans-Himalayan region at a local scale. Here, we examined the effects of incoming solar radiation on variation in woody species composition and compared the diversity between the northeast- and southwest-facing slopes in a Trans-Himalayan valley of Nepal. We also examined the implicit interactions between slope orientation and land use in determining the compositional variations between the slopes. We selected two pairs of northeast- and southwest-facing slopes where the first pair has a similar land use and differs in exposure only(Pisang site) while the other pair has clear differences in land use in addition to slope exposure(Braka site). In each site, we sampled 72 plots(36 on each slope) in which the presence and absence of woody species, environmental variables, and disturbance were recorded. Correspondence Analysis(CA) results suggested that the woody species composition significantly varied between northeast- and southwest-facing slopes at both sites, and was significantly correlated with measured environmental variables such as radiation index, altitude, and canopy openness. In the Braka site,mean alpha diversity was significantly higher on southwest-facing slopes. In contrast, beta diversity and gamma diversity were greater on northeast-facing slopes at both sites. Our results suggest that topographic variables(e.g., radiation index) affect species composition between the slopes, likely due to their influence on small scale abiotic environmental variables. However, the effects of land use, such as livestock browsing/grazing may interact with the effects of slope exposure, effectively reducing differences in species composition within slopes but enhancing the differences in beta diversity between contrasting slopes in the Braka. We conclude that slope orientation and land use are important factors in structuring the woody species composition and diversity in the arid Trans-Himalayan region. We suggest that both environmental and land use variables should be taken into consideration in future studies on plant community structure along the cultural landscapes. 展开更多
关键词 Correspondence analysis Diversity Environmental gradients Himalaya Land use Topographic aspect Woody vegetation
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Performance and Ruminal Characteristics of Beef Cattle Fed Four Different Hybrids Sorghum Silages 被引量:1
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作者 Andreia Santos Cezario Odilon Gomes Pereira Sebastiao de Campos Valadares Filho Karina Guimarfies Ribeiro Stefanie Alvarenga Santos Wender Ferreira de Souza 《Journal of Agricultural Science and Technology(A)》 2013年第4期312-320,共9页
This study was conducted to evaluate the intake, total and partial digestibility of nutrient, ruminal pH and ammonia concentration, microbial protein synthesis and performance in crossbred Holstein × Zebu cattle ... This study was conducted to evaluate the intake, total and partial digestibility of nutrient, ruminal pH and ammonia concentration, microbial protein synthesis and performance in crossbred Holstein × Zebu cattle fed four different hybrids sorghum silages (1F305, XBF60329, BRS610, Volumax). In Experiment 1, four rumen and abomasum fistulated steers, 400 ± 80 kg, distributed in a 4 × 4 Latin Square, were used. In Experiment 2, 28 crossbred Holstein × Zebu steers, 350 ± 50 kg, distributed in a randomized block design with four treatments and seven replicates, were used. In Experiment 1, it was observed that nutrient intake, as well as total, ruminal and intestinal digestibility of nutrient, were not affected (P 〉 0.05) by diets, except for total apparent digestibility of neutral detergent fiber (NDFap), which was lower for the BRS610 hybrid. There was lower NDFap ingestion in animals that received a diet containing silage from the BRS610 hybrid, however, the lowest intake non-fibrous carbohydrates (NFC) was observed for the diet containing silage from the Volumax hybrid. In Experiment 2, nutrient intake were not affected by the diets (P 〉 0.05), whereas, NDFap intake was lesser for hybrid BRS610. It was found that daily weight gain and feed conversion were not affected by different silages diets. Therefore, it may be concluded that the diets used were nutritionally equivalent, as they promoted similar animal performance without affecting ruminal parameters. 展开更多
关键词 Nitrogen balance microbial efficiency weight gain pH
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Microstructure and properties of Al-doped ODS steels prepared by wet-milling and SPS methods 被引量:1
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作者 SUN Yu-zhou LIN Nan +6 位作者 ZHANG Wu-jun ZHANG Yong-sen LI Zhong-tao HAN Xian-qi WU Zheng-gang WANG Zu-yong MA Chao 《Journal of Central South University》 SCIE EI CAS CSCD 2021年第4期1219-1232,共14页
In this paper,15Cr-ODS steels containing 0,1 wt%,2 wt%and 3 wt%Al element were fabricated by combining wet-milling and spark plasma sintering(SPS)methods.The microstructure and mechanical properties of ODS steel were ... In this paper,15Cr-ODS steels containing 0,1 wt%,2 wt%and 3 wt%Al element were fabricated by combining wet-milling and spark plasma sintering(SPS)methods.The microstructure and mechanical properties of ODS steel were investigated by XRD,SEM,TEM,EBSD and tensile tests.The results demonstrate that the Al addition significantly refines the particle precipitates in the Fe-Cr matrix,leading to the obvious refinement in grain size of matrix and the improvement of mechanical properties.The dispersion particles in ODS steels with Al addition are identified as Al2O3 and Y_(2)Ti_(2)O_(7)nanoparticles,which has a heterogeneous size distribution in the range of 5 nm to 300 nm.Increasing Al addition causes an obvious increase in tensile strength and a decline in elongation.The tensile strength and elongation of 15Cr-ODS steel containing 3 wt%Al are 775.3 MPa and 15.1%,respectively.The existence of Al element improves the corrosion resistance of materials.The ODS steel containing 2 wt%Al shows corrosion potential of 0.39 V and passivation current density of 2.61×10^(−3)A/cm^(2)(1.37 V).This work shows that Al-doped ODS steels prepared by wet-milling and SPS methods have a potential application in structural parts for nuclear system. 展开更多
关键词 wet-milling spark plasma sintering ODS steels oxide nanoparticles MICROSTRUCTURE tensile strength dispersion strengthening
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Pyrolytic characteristics and kinetics of the marine green tide macroalgae, Enteromorpha prolifera
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作者 赵辉 闫华晓 +2 位作者 刘明 张从旺 秦松 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2011年第5期996-1001,共6页
The marine macroalgae Enteromorpha prolifera was one of the main algal genera that occurred in the widespread green tides in Qingdao, China, during the summers of 2007, 2008 and 2010. It is thus a plentiful source of ... The marine macroalgae Enteromorpha prolifera was one of the main algal genera that occurred in the widespread green tides in Qingdao, China, during the summers of 2007, 2008 and 2010. It is thus a plentiful source of biomass and could be used as a biofuel. In this study, the pyrolytic characteristics and kinetics of E. prolifera were investigated using thermogravimetric analysis (TGA) method. Cornstalk and sawdust were used as comparisons. Pyrolytic characteristics were studied using TG-DTG (thermogravimetry-derivative thermogravimetry) curves. Three stages in the pyrolytic process were determined: dehydration, dramatic weight loss and slow weight loss. E. prolifera was pyrolyzed at a lower initial temperature than the two terrestrial biomass forms. The apparent activation energy values for the three types of biomass were calculated and the mechanism functions were determined using 16 different mechanism functions, frequently used in thermal kinetics analysis. Activation energy values varied with mechanism function and the range of activation energy values for E. prolifera, cornstalk, and sawdust were 25-50 kJ/mol, 60-90 kJ/mol and 120-155 kJ/mol, respectively. This indicates that E. prolifera has low thermal stability for pyrolysis and good combustion characteristics. 展开更多
关键词 MACROALGAE green tide Enteromorpha prolifera PYROLYSIS KINETICS
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Microscopic Observation of Pyrenoids in Order Ulvales(Chlorophyta) Collected from Qingdao Coast 被引量:1
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作者 TENG Linhong DING Lanping LU Qinqin 《Journal of Ocean University of China》 SCIE CAS 2011年第3期223-228,共6页
Pyrenoids found in green algae Order Ulvales have taxonomical significance.Their morphology,microstructure,and the location and number in the cells have been widely used as identification criteria. As these traits can... Pyrenoids found in green algae Order Ulvales have taxonomical significance.Their morphology,microstructure,and the location and number in the cells have been widely used as identification criteria. As these traits can be affected by environmental conditions,it is necessary to look for other different characteristics.Here pyrenoids in several algae species collected along the Qingdao coast were studied for such purpose. The morphology and distribution of pyrenoids in the cells,as well as their change in different parts of the frond and at different times were studied with light microscope.The results are as follows.Pyrenoids appeared to be spherical or oval in observed Ulvales'algae cells.They were embedded in chloroplasts with the number of 1-3 per cell on average.The number of pyrenoids for Ulva pertusa could change drastically with continuing culture and could reach up to 10-20 per cell in late-growth stages.Generally, the pyrenoids in the marginal part were more observable than those in the central part for Ulva pertusa. In addition, the basal part of frond had more distinct pyrenoids with an average diameter of 2.42 μm for Enteromorpha linza. For some species the pyrenoids were difficult to be observed while dark treatment made them more distinguishable.The apoptosis rate of pyrenoids in different species varied under continuing dark treatment, which could be used to identify different species. Pyrenoids disappeared faster in E. linza than those in E.intestinalis. 展开更多
关键词 Ulvales morphological taxonomy PYRENOID apoptosis process
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TIG welding-brazing joint of aluminum to stainless steel with hot wire 被引量:1
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作者 何欢 林三宝 +2 位作者 陈哲 范成磊 杨春利 《China Welding》 EI CAS 2013年第3期25-30,共6页
TIG welding-brazing process with high frequency induction hot wire technology was presented to create joints between 5A06 aluminum alloy and SUS32! stainless steel using ER1100 filler wire with different temperature. ... TIG welding-brazing process with high frequency induction hot wire technology was presented to create joints between 5A06 aluminum alloy and SUS32! stainless steel using ER1100 filler wire with different temperature. The joints were evaluated by mechanical test and microstructural analyses. The welding procedure using hot fiUer wire (400 ℃ ) significantly increases strength stability by 71% and average value of tensile strength by 30. 8 % of the joints, compared with cold wire. The research of microstructures in interfaces and welded seams reveals that using 400 ℃ hot filler wire can decrease the thickness of intermetallic compounds ( IMCs ) from 6 to 3.5 txm approximately, which is the main reason of mechanical property improvement. 展开更多
关键词 aluminum alloy stainless steel WELDING-BRAZING hot wire high frequency induction INTERMETALLIC
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Towards Understanding Paleosols in Southern Levantine Eolianites:Integration of Micromorphology,Environmental Magnetism and Mineralogy 被引量:1
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作者 Alexander Tsatskin Tatyana S.Gendler +2 位作者 Friedrich Heller Igal Dekman Gitti L.Frey 《Journal of Mountain Science》 SCIE CSCD 2009年第2期113-124,共12页
The paper addresses the controversial question of the role of clay-sized dust in the formation of paleosols in coastal eolianites, Israel. At the Habonim type section, the pedocomplex dated by archaeology and luminesc... The paper addresses the controversial question of the role of clay-sized dust in the formation of paleosols in coastal eolianites, Israel. At the Habonim type section, the pedocomplex dated by archaeology and luminescence to 45-135 ka ago shows at least three paleosols, not separated by non-soil sediments. The oldest reddish paleosol (apparently related to MIS 5) is magnetically enhanced, leached from carbonates, with signs of bioturbation and strongly aged clay coatings. The reddening is due to very fine, -20 nm, poorly crystallized, superparamagnetic (SP) hematite, as determined by Mossbauer studies. In subsoil, lithorelics of eolianite are found. Over time, the soil surface aggraded due to accelerated fine dust accumulation alongside local slope wash. On younger materials formed magnetically depleted vertisols, dominated by smectite-type expandable paramagnetic clays. In thin sections, vertisols exhibit strong stipple-speckled and striated b-fabric due to shrink-swell processes, impregnative calcite nodules and Fe-Mn redistribution. The uppermost hydric vertisol shows the strongest expression of juxtaposed features of recurrent calcite and Fe precipitation. This paleosol developed on colluvial soil materials, as evidenced by mixing of clay coated and uncoated grains of quartz and calcite allochems. M6ssbauer spectra show high amounts of Fe(III) incorporated in the clay structure, low amounts of SP goethite and absence of SP hematite. Whilst magnetic susceptibility drops in vertisols to minimal values, increase. The latter along ferrimagnetie grain sizes with differences in the hierarchy of microfabric features is taken as indication for lithologic discontinuities which may have resulted from continuous, albeit variable and low-intensity, input of eolian clay from both remote Saharan and local sources, roughly dated to the earlier to middle part of the Last Glacial. 展开更多
关键词 Coastal sand loess deposition microfabrie hierarchy magnetic enhancement paramagnetic phyllosilicates MSssbauer effect
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