Experimental analysis of the pore structure, relative permeability, and water flooding characteristics of the Yan'an Formation sandstone, southwestern Ordos Basin

The oil and gas potential of the Yan'an Formation in the Ordos Basin has yet to be fully tapped. In this study, the pore structure, mobile fluid saturation, and water flooding micro-mechanism of the Yan'an Formation sandstone are systematically studied through the application of a series of rock physics and fluid experiments. The results show that there is a good positive correlation between porosity and permeability, and the reservoirs are divided into types Ⅰ, Ⅱ, and Ⅲ. Mercury injection tests show that the average pore throat radius of the oil-bearing reservoir ranges from 1 to 7 μm. The displacement pressure of the Yan'an Formation is also relatively low, and it decreases from 0.1 MPa to 0.01 MPa as the rock porosity increases from 11% to 18%. NMR tests show that small (diameter <0.5 μm) and medium pores (diameter ranging from 0.5 to 2.5 μm) are predominant in the reservoir. Different types of reservoirs have different characteristics of relative permeability curve. In addition, when the average oil recovery rate is less than 1 ml/min, the oil displacement efficiency increases faster. However, when the average oil recovery rate is between 1–3.5 ml/min, the oil displacement efficiency is maintained at around 27%–30%. Physical properties of the reservoir, pore-throat structure, experimental pressure difference, and pore volume injected — all have significant effects on oil displacement efficiency. For Type Ⅰ and Type Ⅱ reservoirs, the increase of the pore volume injected has a significant effect on oil displacement efficiency. However, for Type Ⅲ reservoirs, the change of pore volume injected has insignificant effect on oil displacement efficiency. This study provides a reference for the formulation of estimated ultimate recovery (EUR) measures for similar sandstone reservoirs.

Middle Jurassic Sporo-pollen Assemblage from the Yan'an Formation of Dongsheng, Nei Monggol, China

The Middle Jurassic palynomorphs from the Yan'an Formation in Dongsheng region of Nei Monggol, consist of 63 species of fossil spores and pollen grains belonging to 34 genera, of which two species were described as new. Based on statistical analysis of 3 863 specimens identified in 10 samples from Hantaichuan, Nianpanlianggou and Liugou sections, the sporo-pollen assemblage from the Yan'an Formation in Dongsheng region was established, which is generally characterized by the slight dominance of gymnospermous pollen grains (generally attaining proportion of 51%-54%), whereas the pteridophytic spores reach 46%-49% in abundance. In comparison with those of adjacent regions as well as Eurasia and North America, the present sporo-pollen assemblage is regarded to early Middle Jurassic (corresponding to Bajocian Stage) in geological age. According to the climatic conditions reflected by the palynoflora, the paleoclimate in Dongsheng region is suggested to be warm temperate or subtropical warm and humid during the early Middle Jurassic.

Analysis of a Disastrous Rainstorm Process Affecting Yan'an in July 2013

Based on the MICPAS data and 0. 75°× 0. 75° reanalysis data of the European Center,the characteristics of large-scale circulation in the rainstorm process in Yan'an in late July in 2013 were analyzed. The results showed that the activity of the subtropical high had a significant impact on the occurrence of this rainstorm process. During the rainstorm in Yan'an,the subtropical high extended westward obviously,and the southerly airflow on the periphery of the subtropical high intersected with cold air in northern Shaanxi. The good coupling of high-and low-level jet stream provided dynamic conditions for the occurrence of downpour. During the rainstorm,the low-level jet stream at 850 h Pa was radial,and the high-level jet stream at 200 h Pa in this process was in a quasi-horizontal direction. In the rainstorm process,there was an obvious large-value band of water vapor transport,while the water vapor flux arrived at a high latitude,and the intensity was great.

Construction of Ecological Green Space System in Yan'an City,China

Ecosystem of Yan'an City is being faced with serious problems such as increasing pressure of protecting ecological elements,and contradictions in utilization of ecological spaces.To enhance supervision over regional ecological resources,guide the orderly expansion of urban spaces,construct a stable eco-security pattern for sustainable development of the city,and create an urban environment favorable for living and working,this study follows the principles of "ecology on the priority,landscape continuity,diversity,optimization of layout,and sustainability".By analyzing distribution features of ecological resources in Yan'an City,considering rules of its urban space expansion,and studying the "ring-wedge-network" spatial pattern of its ecological green spaces,this study is to build an ecological network with a complete spatial system,definite ecological zoning and characteristic landscapes in which ecological elements are protected comprehensively,ecological conservation,restoration and construction promoted simultaneously.

The Inspiration of Poetic and Picturesque Literati Garden to Chinese Modern Gardening

Literati garden in Chinese classical garden has its own characteristics,and literature,philosophy and aesthetic values contained in literati garden have a profound impact on the gardening of later generations.Literati garden embodies the aesthetic orientation of Chinese people’s love of poetry and painting,pays attention to the creation of poetic atmosphere and creates an emotional space,making that viewers appreciate the beauty of blending feelings and scenery.In this paper,the characteristics of the literati garden in Chinese classical garden are summarized,and its gardening essence is excavated,and its enlightenment to the modern Chinese garden is explored.

Poetic and Pictorial Splendor-Expression of Traditional Chinese Literati in Chinese Architecture

The expression of traditional Chinese literati is based on connection, seeking emotion and harmony. With various forms, though, this style of expression shares the same value in some art forms, like traditional Chinese poetry, calligraphy and paintings, and Chinese architecture. Based on the commonalities of various forms of literature and art, this paper offered an insight into Chinese architecture in light of poetic and pictorial expression of traditional Chinese literati. In order to illuminate the corresponding connection between traditional Chinese poetry, calligraphy and paintings, and Chinese architecture, this paper discussed the expression of Chinese architecture corresponding to the essence of traditional Chinese poetry, calligraphy and paintings respectively from the perspective of philosophy, aesthetics, and culture study of Chinese architecture. Via analogous analysis, which includes the analogy between the emotion of architecture and the feelings in traditional poetry, the analogy between the order of architecture and the spirit of calligraphy, and the analogy between the artistic conception and the picturesque scene, the poetic and pictorial expression of Chinese architecture was clarified. This paper emphasized that Chinese architecture needs to jump out of the concrete image, eradicate the interdisciplinary boundaries, and stress the integration of arts and humanities in a higher level, to express Chinese architecture in a Chinese way. That means making Chinese architecture modern in forms and techniques, and traditional in spirit and artistic conception.

Poetry and Literary Diplomacy: On the Literary Exchange Between Vietnamese Envoys and Chinese Literati

This paper mainly discusses the diplomatic way of Vietnamese envoys through literature during their mission toChina, including the group, communication mode and reason of the literary exchange between Vietnam envoy andChinese literati. The article points out that the Chinese literati contacted by Vietnamese envoys could be dividedinto Lingnan literati group (Guangdong and Guangxi provinces), Huguang literati group (Hunan and Hubeiprovinces), Jiangnan literati group (Southern Anhui and Jiangsu provinces), and Northern literati group (Henan &Hebei provinces and Beijing). There are three main ways of literary communication between Vietnamese envoysand Chinese literati: the first is to give poems to each other according to fixed rhythm;the second is to communicateby writing;the third is to comment on poems each other. There are two main reasons for the literary exchangebetween Vietnamese envoys and Chinese literati: on the one hand, they wanted to achieve the purpose of “poetrydiplomacy” with literature, and took the initiative to communicate with Chinese literati;on the other hand, Chineseliterati were curious about Vietnamese envoys, so they asked Vietnamese envoys to give poems, or even paid fortheir literary works. The literary exchange between Vietnamese envoys and Chinese literati is a direct reflection ofthe literary exchange between China and Vietnam, from which we can see that the Chinese literature of Vietnam inthe feudal period is an important part of the Chinese cultural circle.

Analysis of Characteristics of the Rural Political Participation in Yan'an Period

From October 1935 when the Central Red Army arrived in northern Shaanxi to March 1948 when the Central Committee of the Communist Party of China crossed the Yellow River,the Communist Party of China inspired ordinary party members' political participation consciousness through rectification and seeking the opinions of non-party individuals,and stimulated the political participation enthusiasm of democracy activists through the special election to improve farmers' political participation awareness,in order to form a unique " Yan'an democratic model",which greatly accelerated the victory of the resistance war and accumulated rich experience for democratic construction.

Present re-recognition of the significance of the aesthetic value of the traditional literati paintings

The literati paintings are a special art nourished by the philosophy, religion, poetry and calligraphy and many other cultural forms in ancient China, which can be regarded as the oriental comprehensive symphony. In terms of the depth of the art, it is the tower accumulated by various Chinese cultures, rich solid. It contains the ＂morality＂, ＂elegant banter＂, ＂super shape＂, and ＂fun＂ of the literati, which can be regarded as the representative of the high difficulty and deep degree of the Chinese traditional arts, and it is the spirit of the Chinese national paintings.

Land Potential Productivity and Population Carrying Capacity of Yan'an City

The productivity attenuation method is adopted to calculate land potential productivity of counties of Yan'an City and calculate population carrying capacity at current productivity level. Result shows that high photosynthetic potential productivity area and high light and temperature potential productivity area are mainly situated in the north,while high climatic potential area and high land potential productivity area are mainly concentrated in the south. From solar radiation,moisture and landform,the attenuation amplitude of land potential productivity in northern counties ( districts) is greater than that in southern counties ( districts) . In the whole city,the population carrying capacity of 9 counties reaches well-off living level,and 1 district still does not reach the level of adequate food and clothing. These results can provide reference for land resource use,agricultural production distribution and population growth control.

文士休闲文化视野下的明清江南古典园林营造

文士作为一个文化群体,是我国古代统治阶级知识分子的统称,也是江南古典园林精神文化内核的缔造者,研究中国园林的文化属性离不开这一群体。文章从文士群体的休闲文化视角出发,探究其对明清江南古典园林的营造影响及设计体现,并为当下园林景观设计提供思想借鉴。

基于融合发展的延安革命文物保护利用研究

融合发展是新时代革命文物保护利用的创新举措。革命文物由于数量多、分布广,存在保护不平衡、展陈同质化、辐射带动效果不佳等普遍性问题。本文以延安革命文物为例,构建以革命文物为核心价值的要素体系,从全域资源视角出发,运用GIS空间分析方法,综合分析革命文物空间集聚性、城市关联性、道路通达性、资源组合性等空间特性,提出“分类保护、轴线带动、组团开发”的保护利用空间策略,探索革命文物整体保护和融合发展的路径,切实推进革命文物内涵价值和空间特质融入现代生活,改善民生福祉,赋能老区发展,促进延安精神传承弘扬。

祠堂记与古代文人祠祀的集体认同

古代文人祠祀是一个值得关注的文化现象,其祠祀动机相较于传统的先贤崇祀更为特殊。士人群体奉祀文人不仅因为他们的文学才能,更出于对文人高尚品格和多舛命途的认可与同情。这些行为和观念在文人祠堂记的书写中得到了充分体现。祠堂记不仅载录和揭示了文人奉祀的来源及意义,还展现了士人群体如何精心塑造和维护文人形象,并在这一过程中形成的特定集体性意识。可以说,文人祠祀承载了古代社会对文人价值的公共认知,而这些认知在相关祠堂记对奉祀对象文人身份的塑造中,得到了具体体现,凝聚了士人群体对“文人”这一社会形象的集体心理与命运共鸣。此外,一些文学批评的共识也在祠堂记书写中得到体现,这不仅展现了士人群体的文学集体观念,而且进一步推动了文人形象的塑造和文人价值的阐释。

历史建筑地标景观的可视化表达方法研究——以延安南关街片区为例

历史建筑地标景观的可视化展示对于彰显城市文化特征、树立城市形象意义重大。以延安南关街片区为例,借助GIS平台对其历史建筑地标景观进行景观域面可视范围测度、景观视线廊道构建以及景观视野图景优化,从域面、轴线和焦点三个层面探析历史建筑地标景观的可视化表达方法与途径。研究表明,可视化分析方法可为景观表达提供数据基础和科学支撑,有助于营造增进视觉体验的可视空间语境,实现历史建筑地标景观的可见、可感与可意。

“诗之出位”与诗、画会通——论杜甫题画诗对“文人画”生成之影响

有唐一代,文学、艺术全面繁荣并互相影响,题画诗创作兴盛,爱好绘画艺术的诗人杜甫,被公认为唐代题画诗创作的“第一人”。从盛唐到中唐,政治与社会、文化都经历重大转折,绘画艺术精神也同步发生重大变革。杜甫身处这一时期,高度关注绘画,以“诗人之眼”赏画、论画,其题画诗体现诗、画会通的美学思想:以“神”“气”论画,追求“传神”,强调“立意”;以画“遣兴”,在题画诗中表达山水隐逸的趣味与立意。杜甫的绘画艺术理念,体现出诗歌思想的影响,也一定程度上反映出绘画实践变革的动向。杜甫题画诗及其绘画观念入宋以后深得推崇,不仅影响了唐代画史的建构,也对“文人画”理念的生成与绘画创作实践作出重大贡献。

延安地区防治苹果树腐烂病药剂调查及田间防效试验

为了解延安地区防治苹果腐烂病药剂种类,筛选防治苹果树腐烂病高效药剂,为苹果树腐烂病绿色防控提供依据。首先调查了目前延安地区常用防治腐烂病的药剂种类。在调查基础上,以29 a生富士苹果树为试验材料,采用病疤刮治法,选用5种杀菌剂对苹果树腐烂病进行田间防效试验,以病疤复发率、防治效果、愈合度和愈合宽度为指标对药效进行综合评价。试验结果表明,使用0.5%小蘖碱(溃腐灵)水剂原液、1.8%辛菌胺醋酸盐水剂200倍液、新敌腐2代原液、6%嘧啶核苷类抗菌素(农抗120)15倍液、3%甲基硫菌灵(国光膜泰)糊剂125 g/m^(2)涂抹刮净的病疤后,病斑复发率依次为3.4%、6.8%、3.0%、4.0%、0;愈合度依次为28.25%、18.52%、47.11%、20.13%、50.55%;愈伤组织平均宽度为2.97 cm、1.88 cm、3.56 cm、1.64 cm、4.73 cm;防治效果分别为96.6%、93.2%、97.0%、96.0%、100%,均高于90%。综合药效评价,5种杀菌剂对防治苹果树腐烂病都有效果,其中3%甲基硫菌灵糊剂125 g/m^(2)综合效果最好,其次是新敌腐2代原液和0.5%小蘖碱水剂原液。本试验5种药剂均可作为生产中防治腐烂病应用药剂。

汉赋中的舞蹈及汉舞的审美意蕴

汉赋作为汉代最具代表性的文体,蕴含着丰富的文化内容和鲜明的时代特征,其中有关乐舞的赋文历来被视为研究美术史和艺术现象的重要资料。汉代乐舞赋以及其他诸多同时期的文论中所见对舞蹈场景丰富而细腻的描写,侧面展现出中国历史上第一个舞蹈艺术高峰期的盛况。汉代乐舞百戏的兴盛为文学创作提供了大量生动的视听资源和丰富立体的审美视角,而文人们对舞蹈活动的参与也推动了舞蹈艺术在理论上的提升。汉代文人在赋体写作中巧妙地融入了身体动作的意象元素,以罗列、白描、夸饰、比喻等修辞手法诠释了舞蹈艺术形式的审美意蕴,抒发了舞蹈“气”与“体”的生命律动,这让处于汉代文学艺术高峰的汉赋扮演了汉代乐舞艺术传承媒介的角色。因而,我们可以从汉赋中挖掘出汉代舞蹈的审美意蕴,加深对这一传统艺术形式所表达的思想内涵的理解,进一步丰富中华传统文化遗产。

延安时期戏剧作品的劳动叙事及其文化表征

延安时期,陕甘宁边区政府通过倡导大生产运动,间接完成了对边区军民的组织动员工作。“劳动”作为关键词频繁出现于延安时期的戏剧作品中,“劳动”与戏剧以连接边区军民民族国家想象的姿态出场。有关劳动叙事戏剧作品的涌现,既是戏剧生产组织对边区中央政策的主动响应,亦是剧作家群体在充分考量边区军民主体情感诉求基础上的有意识书写。延安戏剧作品作为文学作品中最具典型性的“文本”,通过劳动叙事及其文化表征,具象呈现了边区“新人”的形象塑造与“新式家庭”的生成过程,进而有效激发了军民团结抗战的革命热情,促进了新的革命主体的生成。

延安时期党的青年工作的三维探赜

中国共产党高度重视青年工作,在延安时期,党的青年工作取得重要成绩。科学继承党做好青年工作的优良传统,动员青年参加抗日战争的时代需要,以及扩大抗日民族统一战线的时代必然,构成党做好青年工作的时代应然。党积极探索科学合理的方式,推进青年工作的开展。创办各类学校和培训班,加强青年的文化政治教育;推进大生产运动与社会调查工作的协同开展,提高青年的社会实践能力;探索丰富有效的艺术形式,引领青年积极投身抗日斗争;创办组织机构和社会团体,凝聚青年力量。要辩证汲取党在延安时期做好青年工作的有益经验,扎实推进新时代的青年工作。党要高度重视青年工作,坚持对青年工作的科学领导,保证青年工作的合理方向,同时要契合时代任务做好青年工作,着力发挥青年的重要作用。

乾嘉时期京城文人的都城体验与诗文书写

乾嘉时期的文学与思想转型是学界关注的热点。通过观察清中期文人的诗文书写,可注意到京城文人日常生活中奢侈与穷困的两极化处境,亦可发现文人参与修禊雅集与诗社雅集时所感受到的时间流逝的加速感与交往距离的隔膜感。前者源于京城景观的变迁与宵禁制度,而后者则源于文物赏玩时视角的聚焦与价值排他性,二者共同造成了乾嘉京城文人的失落情绪。为了应对京城生活的压力与失落,文人不仅在诗文中咏叹遗迹、追忆前贤,更通过重建万柳堂、寄园等建筑实体与仪式活动,重塑文人的公共空间,以缓解文人在情感与身份认同上的焦虑。乾嘉文人的京城生活体验激发了他们时不我待的使命感与不服输的傲岸人格,这同样刺激了乾嘉时期文学及学术的发展与传承。