北方航线的综合评价研究

考虑航线评价中的多种因素及其影响程度的不同,从安全和经济的角度出发,采用模糊综合评判方法对北方航线进行航线优劣程度评价.     

基于新型相似日选取和VMD-NGO-BiGRU的短期光伏功率预测

光伏功率预测在现代电力系统调度和运行中起着重要作用.针对光伏发电功率的多变性和复杂性,提出了一种基于新型相似日选取和北方苍鹰算法（Northern Goshawk Optimization, NGO）优化双向门控循环单元（Bidirectional Gated Recurrent Unit, BiGRU）的短期光伏功率预测方法.首先,利用斯皮尔曼相关系数选取主要气象因子,通过变分模态分解（Variational Mode Decomposition, VMD）将原始光伏功率和最大气象因子分解重构为一系列子信号.其次,通过构建新的评价指标筛选出相似日数据集,利用一组BiGRU建立以相似日子信号为网络输入的深度学习模型,并利用NGO对每个BiGRU网络的超参数进行有效优化.最后,对各子信号的预测结果进行综合,得到最终的光伏功率预测值.仿真结果表明,所提混合深度学习方法在预测精度和计算效率方面均优于其他方法.     

皖北农村中学生体质现状及监测方法的可行性研究

采用问卷调查法和访谈法,对皖北农村地区中学生体质监测方法进行了调查研究,结果表明：1）中学生的体质水平整体不高,体育活动没有得到很好的开展．2）缺乏体育场地和器材,影响学生进行体育锻炼的兴趣．3）中学的相关人员没有为学生进行体质监测的意识,还没有建立起相应的体质监测平台．建议各级部门和教师充分重视体质监测工作,为增强广大中学生的体质做出应有的贡献．     

Deep structure at northern margin of Tarim Basin

In this paper, a 2D velocity structure of the crust and the upper mantle of the northern margin of the Tarim Basin （TB） has been obtained by ray tracing and theoretical seismogram calculation under the condition of 2D lateral inhomogeneous medium using the data of seismic wide angle reflection/refraction profile from Baicheng to Da Qaidam crossing the Kuqa Depression （KD） and Tabei Uplift （TU）. And along the Baicheng to Da Qaidam profile, 4 of the 10 shot points are located in the northern margin of the TB. The results show that the character of the crust is uniform on the whole between the KD and TU, but the depth of the layers, thickness of the crust and the velocity obviously vary along the profile. Thereinto, the variation of the crust thickness mainly occurs in the middle and lower crust. The Moho has an uplifting trend near the Baicheng shot point in KD and Luntai shot point in TU, and the thickness of the crust reduces to 42 km and 47 km in these two areas, respectively. The transition zone between the KD and TU has a thickest crust, up to 52 km. In this transition zone, there are high velocity anoma- lies in the upper crust, and low velocity anomalies in the lower crust, these velocity anomalies zone is near vertical, and the sediment above them is thicker than the other areas. According to the velocity distributions, the profile can be divided into three sections： KD, TU and transition zone between them. Each section has a special velocity structural feature, the form of the crystalline basement and the relationship between the deep structure and the shallow one. The differences of velocity and tectonic between eastern and western profile in the northern margin of the Tarim Basin （NMTB） may suggest different speed and intensity of the subduction from the Tarim basin to the Tianshan orogenic belt （TOB）.     

Sea surface temperature and terrestrial biomarker records of the last 260 ka of core MD05-2904 from the northern South China Sea

This paper reports high-resolution biomarker records of the last 260 ka for core MD05-2904 from the northern South China Sea （SCS）. The sea surface temperature （SST） record using the U37^k＇, index reveals a minimum of 21.5℃（MIS 2） and a maximum of 28.3℃（MIS 5.5）, for a temperature difference of almost 7℃, and provides the longest high-resolution U37^k＇ SST record in northern SCS. The content of odd-number long chain n-alkanes and several n-alkanes indexes such as the CPI, ACL and the C31/C27 ratio, all reveal generally higher values during the glacials and lower values during the interglaclals. Terrestrial input as Indicated by n-alkane content was mostly controlled by sea-level changes： During the glacials, lower sea-level exposed the continental shelf to enable rivers to transport more terrestrial materials to the slope; and the situation reverses during the interglacials. The n-alkane indexes changes reveal more n-alkanes from contemporary vegetation during glacials as a result of the proximity of the core site to the source region, while the increases in ACL and C81/C27 ratio during glaclals indicate a change to more grassy vegetation. However, the highest values for CPI, ACL and the C81/C27 ratio all occurred during late MIS 3, and it was suggested that this period was characterized by a strong summer monsoon-dominated humid climate which resulted in a denser vegetation for the exposed continental shelf region.     

北方中小学校园绿地规划设计探讨

根据中小学教学生活和北方气候的特点，提出了我国北方中小学校园绿地规划设计应遵循的原则，即符合教学生活规律、因地制宜、注重生态效益、结合经济效益、新颖美观、少花钱多办事。对绿地布局、绿地率、绿化形式、活动场地的安排、自行车棚的处理、植物配植及建筑小品与雕塑的设置等设计要点进行了探讨。     

鄂尔多斯盆地西缘南段羊虎沟组地层划分与对比——以下河沿剖面为例

鄂尔多斯盆地西缘石炭系羊虎沟组发现发育有良好烃源岩,烃源岩中有机质含量高,具有良好的开采前景,原有的地层划分颇具争议,难以满足日益增长的勘探需求。本文以卫宁北山地区下河沿剖面为例,通过野外剖面实测、地球化学元素检测、古生物检测,结合盆地整体沉积背景,对羊虎沟组进行精细化分,确定盆地西缘南段地区地层划分标志层。重新厘定羊虎沟组与太原组界限,将石炭系与二叠系界限作为羊虎沟组与太原租的分界线。根据孢粉分布,羊虎沟组自下而上划分出3个孢粉带：Lycospora noctuina—Cyclogranisporites aureus组合、Dictyotriletes bireticulatus—Ahrensisporites guerickei—Torispora securis组合、Crassispora kosankei— Densosporites anulatus组合。地球化学特征表明,羊虎沟组时期Mn/Fe值上升,-δ_¹³C‰值下降,该时期海平面上升;至太原组时期,Mn/Fe值下降,-δ_¹³C‰值上升,该时期海平面下降。据此,将羊虎沟组划分羊3、羊2、羊1三段。通过地球化学特征结合沉积相,确定三级旋回划分,进一步验证岩石地层划分。通过建立区域地层对比剖面,展现了工区西部地层厚度大,东部小的沉积特点,不同地区羊虎沟组地层及其组内各小层分布、发育存在明显差异性的特点。     

Four new freshwater gobies of the genus Rhinogobius (Teleostei: Gobiidae) from northern Vietnam

Four new freshwater gobies of the genus Rhinogobius Gill, were collected from the river running into the Gulf of Tonkin in northern Vietnam. They are Rhinogobius boa new species, Rhinogobius variolatus new species, Rhinogobius virgigena new species and Rhinogobius sulcatus new species. These four new species can be distinguished from other congeneric species by a combination of characters such as the meristic features, shape of body, shape of first dorsal fin and coloration pattern.     

北方平原乡村旅游资源的规划开发——以魏庄为例

北方平原地区乡村旅游发展过程中,旅游产品规划缺乏生态指导,乡土特色丧失,建筑布局混乱是摆在平原乡村旅游地的重要问题.根据地域特色,规范乡村建设布局,发展旅游循环经济是解决这种矛盾的重要方式和途径.以魏庄为例,努力构建新型高效环保的开发模式,为国内其他平原乡村旅游地提供更多的参考和借鉴.     

2011年秋季北黄海浮游植物群落

2011年11月21—25日在北黄海海域对32个站位进行了生物采样,应用Utermohl方法对调查海域的浮游植物群落进行了研究．经115个样品的分析,共发现浮游植物3门31属64种．调查区浮游植物群落主要由硅藻和甲藻组成,还有少量的金藻,物种以暖温性和广布性物种为主,主要优势种为：具槽帕拉藻、虹彩圆筛藻、三角角藻、斯氏几内亚藻、梭形角藻和旋链角毛藻等．本次调查浮游植物细胞丰度平均值为4．2×10^3个／L;硅藻占浮游植物细胞丰度的比例最大,平均值为3．6x10^3个／L;其次为甲藻,平均值为O．95×10^3个／L．调查海域浮游植物细胞丰度分布不均匀,辽宁南岸海域最高,山东近岸海域其次,北黄海中部海域最低．细胞丰度在水体中的垂直分布趋势为先降低后升高,其中底层的细胞丰度主要由具槽帕拉藻和虹彩圆筛藻贡献．从断面分布上看,细胞丰度高值多集中在受陆源输入影响明显的近岸海域．调查区浮游植物群落多样性指数和均匀度指数均在北黄海北部海域较高,在近岸海域较低．与历史资料的对比发现,近30年来北黄海浮游植物群落结构比较稳定．