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.

AN APPROACH OF DEFENDING AGAINST DDOS ATTACK

An approach of defending against Distributed Denial of Service (DDoS) attack based on flow model and flow detection is presented. The proposed approach can protect targets from DDoS attacking, and allow targets to provide good service to legitimate traffic under DDoS attacking, with fast reaction. This approach adopts the technique of dynamic comb filter, yields a low level of false positives of less than 1.5%, drops similar percentage of good traffic, about 1%, and passes neglectable percentage of attack bandwidth to the victim, less than 1.5%. The prototype of commercial product, D-fighter, is developed by implementing this proposed approach on Intel network processor platform IXP1200.

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.

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.

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.

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.

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.

Defending the Frontier

LIU Jie still remembers the challenges she faced in the fight against the AIDS epidemic during her stint as a medical volunteer in Nigeria six years ago. Ironically, it was not the lack of medicine or funding that was the biggest hurdle, but the difficulty in effectively delivering the treatment drugs and services.

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。

平等权视角下的法律援助制度研究——以值班律师“同案不同援”问题为切入点

党的二十大提出“建设覆盖城乡的现代公共法律服务体系”,这彰显公共法律服务均等化发展的理念。法律援助作为现代公共法律服务体系的重要组成部分,其均等化更是在诉讼中实现公民平等权的应有之义。然而值班律师作为我国最重要的法律援助形式之一,其实践运行中“同案不同援”的问题显著,具体表现为值班律师个体能力参差、尽职程度差异明显以及诉讼权利受限等,这也严重影响了刑事诉讼中被追诉人的平等权保障。而且,值班律师是“认罪认罚从宽”“律师辩护全覆盖”等改革的重要组成部分,而如何提升法律帮助效果直接关涉改革的正当性基础。值班律师的公设辩护人化改革是解决问题的关键。具体而言,应推进值班律师队伍构成的一元化建设,提升与优化配置值班律师的津贴补助,同时落实认罪认罚从宽制度下值班律师的各项职责。

行政公益诉讼适格被告认定的特殊规则——以监督管理职责为逻辑起点

法定职责是普通行政诉讼中确定适格被告资格的核心要件。以负有法定职责作为适格被告的认定标准增加了启动行政公益诉讼的难度。与以“个人利益中心论”为理论基础的普通行政诉讼不同,行政公益诉讼是以保护国家利益和社会公共利益为目的的客观诉讼,应以功能主义模式为进路,确定行政公益诉讼中案件适格被告的认定规则。立足于监督行政机关依法履职、实现法律统一实施的制度设计,应将内部层级监督职责、宏观管理职责、行政决策职责、规范性文件制定职责等纳入公益诉讼案件行政机关负有的监督管理职责中。凡具有监督管理职责的行政机关,均具备行政公益诉讼的被告资格。

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。

认罪认罚案件被告人滥用上诉权法律规制之探讨

在我国认罪认罚从宽制度实施过程中存在被告人滥用上诉权的问题。被告人滥用上诉权有违认罪认罚从宽制度的设立宗旨,降低了诉讼效率,浪费了司法资源,有必要从法律上进行规制。我国应在借鉴域外规制认罪协商案件被告人滥用上诉权立法经验的基础上,结合我国司法实践,对认罪认罚案件被告人滥用上诉权问题进行法律上的规制,构建认罪认罚案件一审法院上诉理由过滤机制,同时建立认罪认罚案件二审法院上诉许可审查机制。处理好保障认罪认罚案件被告人上诉权和规制其滥用上诉权的关系,确保我国认罪认罚从宽制度有序运行。

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。

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。

“保卫新闻学”:略论中国新闻学的学科建设与自主知识体系建构

“保卫新闻学”话题,既关乎中国新闻学何去何从的问题,也涉及中国道路行稳致远的问题。中国共产党近百年的新闻学,经历了从人民新闻学到现代新闻学再到中国新闻学“一波三折”的发展进程。新时代新闻学及其自主知识体系的开辟与建构,既要化解集中于学科、学刊与学风诸领域的深层次矛盾,更须从新中国新闻史着手,继承发扬人民新闻学的道统——“立足中国土,请教马克思”,借鉴现代新闻学“用学术讲政治”的学统,传承老一辈“谦虚、学习和坚忍”的学术品格。

基于层次分析法构建舰艇抗饱和攻击防御策略研究

当舰艇受到饱和攻击时,采用不同的防御策略进行防御作战会获取不同的作战效果。为了提高舰艇对抗多目标饱和攻击的防御能力,采用层次分析法分析研究建立防御武器层次的评价函数,分析在一定作战条件下构建不同防御武器层次的舰艇抗饱和攻击策略,获取抗饱和攻击防御的最佳方案,对提高舰艇抗饱和攻击效率具有较好的现实意义。

阿尔都塞“保卫马克思”的理论叙事

“保卫马克思”是阿尔都塞理论初衷。阿尔都塞立足《资本论》研究,聚焦“意识形态”问题,采用征候阅读法来理论地保卫马克思,捍卫马克思思想关于社会历史构成的“科学逻辑”。阿尔都塞冲撞意识形态界限的努力把意识形态的隐匿性、封闭性、统治性显现出来,从而为穿过意识形态幻象提供了理论前提。阿尔都塞在意识形态维度探讨“个人消失”难题,是对马克思“个人被抽象统治”现代性问题的深入延展,但是阿尔都塞“意识形态精神分析”问题是从根本上错失了马克思的“解放逻辑”。阿尔都塞“保卫马克思”的成败启示我们要妥善处理形而上学批判和后形而上学希望的辩证关系,积极推进马克思主义经济哲学、政治哲学、文化哲学的当代建构。

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。

延安时期红色歌曲的生成逻辑、艺术风格与艺术价值

红色歌曲是在革命、建设和改革开放过程中形成的以歌颂党的领导、弘扬革命精神、赞美改革开放的伟大成就等为主题的一种新的艺术类型。延安时期的红色歌曲,以其简洁明快的旋律、朴实无华的语言,表达了对革命的信念和对美好生活的向往。红色歌曲融入民间音乐元素,使其更具魅力和感染力。这些歌曲不仅记录了历史风貌和人民情感,不仅具备一定的艺术价值,还蕴含着爱国主义和革命精神,对激励今天的青少年和人民投身民族复兴大业,具有现实意义和历史意义。