"多义性的诠释"不是脱离文本的随意阐释——为陈思和主编的《中国当代文学史教程》指瑕

陈思和主编的《中国当代文学史教程》“被视为当代文学史研究在90年代以来获得突破性进展的标志性著作”，毋庸讳言，该书在解读、评价《百合花》、《组织部新来的青年人》、《李双双小传》等作品时，多处出现脱离文本的过度阐释现象。     

Re-visiting barium isotope compositions of mid-ocean ridge basalts and the implications

Barium (Ba) isotopes can be used as potential tracers for crustal material recycling in the mantle. Determination of the Ba isotope composition of the depleted mantle is essential for such applications. However, Ba isotope data for mantle-derived basalts are still rare. In this study, we reported high-precision Ba isotope data of 30 oceanic basalts including 25 mid-ocean ridge basalts (MORBs) from geochemically and geologically diverse mid-ocean ridge segments and five back-arc basin basalts. The δ138/134Ba values of these samples varied from ?0.06‰ to +0.11‰, with no systematic cross-region variation. Together with published data, we constrained the average δ138/134Ba of global MORBs to +0.05‰±0.09‰ (2 standard deviation, n = 51). Based on depleted MORBs that have (La/Sm)_N < 0.8, low 87Sr/86Sr (< 0.70263), and low Ba/Th < 71.3, we estimated the average δ138/134Ba of the depleted MORB mantle (DMM) as + 0.05‰ ± 0.05‰ (2SD, n = 16) that is significantly lower than the DMM (≈ 0.14‰) reported previously. If a new estimation of the DMM is applied, it is unreasonable to infer that the Ba isotope signatures of the “enriched-type” MORBs (E-MORBs) could be attributed to pervasive sediment recycling in the upper mantle. We, therefore, conclude that the Ba isotope compositions of the E-MORBs could be sourced from the incorporation of subducted altered oceanic crust and/or sediments depending on the Ba isotope composition and other geochemical information of the local mantle.     

供应链中社会资本、不确定性与机会主义行为关系的实证研究

供应链中普遍存在机会主义行为风险，而关于此类研究成果主要基于交易成本理论而缺乏对供应链中的社会关系的考量。深入分析了社会资本的结构、认知和关系维度的内在关系，给出了社会资本抑制机会主义行为的作用路径。建立了社会资本-不确定性-机会主义行为的结构方程模型，通过采集制造业、石油化工业等不同行业的300份供应链成员有效问卷对模型假设进行检验。研究结果表明：社会资本结构维度中信息交换对认知维度中的文化理解与过程集成均有显著正向相关性，文化理解与关系维度中的信任与合作规范均有显著正向相关性，过程集成与关系维度中的信任有显著负相关性、与合作规范呈现显著正相关性。认知维度中文化理解与供应链成员内部不确定性显著负相关，关系维度中信任与供应链成员行为不确定性显著负相关，而供应链中不确定性显著提升其机会行为发生的可能性。     

基于GIS的安徽省生态保护红线划定方法研究

生态保护红线是现代生态文明建设的重要举措之一,本文从安徽省的重要生态功能区、生态敏感区以及安徽省内禁止开发的区域等方面,建立安徽省生态保护红线划定的指标体系,应用GIS软件,结合定量的计算方法,初步划定安徽省生态保护红线的范围和面积,为下一步全省生态保护红线划定工作的开展提供参考。     

智能交通ETC系统中电子标签的防碰撞算法研究

公路的人工收费方式已经成为我国公路车辆快速通行的瓶颈之一,使得研究与推广不停车收费(ETC)系统成为我国公路交通的迫切需要.由于在实际情况下要求读卡器能识别多个同时进入ETC车道的电子标签,所以需采取合适的防碰撞算法.探讨了一种基于CSMA/CA技术的电子标签防碰撞设计,并进行分析,提出合适的防碰撞方法,满足了实际要求.     

风机叶片真空系统布置的优化与应用

通过对某型号风机叶片真空系统布置的现状进行分析,提出了系列优化方案,并结合外界环境条件对各方案进行验证,掌握了不同温况下较为合理的真空系统布置工艺,并给出在推广中进一步优化的建议,对于企业降本增效、提升市场竞争力具有较高的应用价值。     

CuO对Ti-C-Al体系自蔓延反应过程的影响

选择Ti--C--Al和Ti--C--Al--CuO两种体系,采用原位反应近液相线铸造技术,制备铝基复合材料.通过金相显微镜、扫描电镜和X射线衍射仪研究了复合材料的微观组织.对上述两种体系的反应进行了热力学与动力学分析.进一步研究了CuO对Ti--C--Al体系的自蔓延反应过程的作用机理,建立了其反应过程的动力学模型.结果表明:在Ti--C--Al体系自蔓延反应过程中,CuO和Al的反应可以提高其反应体系的绝热温度,能为该体系反应持续提供热量,使其自蔓延效果更为显著,反应更加彻底,大大减少条块状的中间产物Al3Ti,优化了材料组织.     

复杂产品项目工作分解绩效预测的系统动力学模型

基于复杂产品项目工作分解的特征和系统动力学在解决系统本质行为和机理方面的优势, 建立系统动力学模型, 用以分析对产品复杂度的把握、核心技术的创新能力、人员动因、 合作伙伴和外部环境对工作分解绩效的发展影响, 并对特大型船舶制造项目进行动态仿真, 分析和预测工作分解的绩效和可能存在的问题, 结果表明: 对产品复杂度的把握和核心技术的创新能力是工作分解绩主要压力, 因此导致的企业投入分配比例问题将是工作分解高效进行的主要制约因素, 主要影响因素相互协调配合才能有效提升工作分解绩效.     

计量视角下学科评价发展现状与研究热点分析

随着时代变化,学科评价不断趋于多样化和多元化,其研究方法不断丰富,研究热点层出不穷。本文具体阐述了计量视角下国内外学科评价发展的现状,对近几年学科评价领域的热点问题进行了分析,以期对学科评价相关领域提供借鉴和参考。     

Early agricultural development and environmental effects in the Neolithic Longdong basin （eastern Gansu）

Neolithic agricultural development and environmental effects in the Longdong area were reconstructed using a synthetic approach, investigating pollen, charcoal, and seed remains for two cultural layer sections and five flotation sites. Results show that Neolithic agriculture in the Longdong area had a simple organization and was dominated by the production of common millet, especially in the early and middle Yangshao age. After the late Yangshao age, Neolithic agriculture developed into a more complex structure, dominated by both common and foxtail millet and the cultivation of rice and soybeans. The production of foxtail millet gradually increased through the Neolithic period, reaching its highest point during the Qijia culture. Soybeans were first cultivated during the late Yangshao culture, approximately 5000 cal a BP. Rice production began no later than 4800 cal a BP, and continued to exist in the Qijia culture, approximately 4000 cal a BP. Agricultural production in Neolithic Longdong, specifically in the “Yuan” area of the loess plateau, developed as a shrub and grass dominated landscape. Vegetation in the river valleys was partly covered with Picea, Tusga, and Quercus coniferous and broadleaf mixed forests. Agricultural activity during the Neolithic period caused an increase in farmland on the loess tableland and a decrease in the abundance of shrub and grassland in the Longdong area. When farmlands were abandoned, vegetation recovered with Hippophae-, Rosaceae-, Ephedra-, and Leguminosae-dominated shrublands and Artemisia-dominated grasslands.