11,700 research outputs found
Numerical modelling of ice floods in the Ning-Meng reach of the Yellow River basin
No full textThe Ning-Meng reach of the Yellow River basin is located in the Inner Mongolia region at the Northern part of the Yellow River. Due to the special geographical conditions, the river flow direction is towards the North causing the Ning-Meng reach to freeze up every year in wintertime. Both during the freeze-up and break-up period, unfavourable conditions occur which may cause ice jamming and ice dam formation leading to dike breaching and overtopping of the embankment. Throughout history this has often led to considerable casualties and property loss. Enhanced economic development and human activities in theregion have altered the characteristics of the ice regime in recent decades, leading to several ice disasters during freezing or breaking-up periods. The integrated water resources management plan developed by the Yellow River Conservancy Commission (YRCC) outlines the requirements for water regulation in the upper Yellow River during ice flood periods. YRCC is developing measures that not only safeguard against ice floods, but also assure the availability ofadequate water resources. These provide the overall requirements for developing an ice regime forecasting system including lead-time prediction and required accuracy. In order to develop such a system, numerical modelling of ice floods is an essential component of current research at the YRCC, together withfield observations and laboratory experiments. In order to properly model river ice processes it is necessary to adjust the hydrodynamic equations to account for thermodynamic effects. In this research, hydrological and meteorological data from 1950 to 2010 were used to analyse the characteristics of ice regimes in the past. Also, additional field observations were carried out for iceflood model calibration and validation. By combining meteorological forecasting models with statistical models, a medium to short range air temperature forecasting model for the Ning-Meng reach was established. These results were used to improve ice formation modelling and prolong lead-time prediction. The numerical ice flood model developed in this thesis for the Ning-Meng reach allows better forecasting of the ice regime and improved decision support for upstream reservoir regulation and taking appropriate measures for disaster risk reduction.Dissertation submitted in fulfillment of the requirements of the Board for Doctorates of Delft University of Technology and of the Academic Board of the UNESCO-IHE Institute for Water Education.Environmental Fluid Mechanic
A propos de "baisser la tête"
No full textMeng Wang, Zhang Ning. A propos de "baisser la tête". In: Perspectives chinoises, n°24, 1994. pp. 42-43
Supplemental Material - Humor Styles and Marital Satisfaction: Cluster Analysis of the Relationship
No full textSupplemental Material for Humor Styles and Marital Satisfaction: Cluster Analysis of the Relationship by Meng-Ning Tsai, Yung-Chieh Cheng, and Hsueh-Chih Chen in Psychological Reports</p
Numerical modelling of the ice trigged floods on the Ning-Meng reach of the Yellow River
No full textThe Yellow River in China was frequently subjected to ice flood disasters during the winter. Possible dike-breaking due to the ice floods poses a serious threat to the region located along the river. In particular the Ning-Meng reach (including Ningxia Hui and Inner Mongolia Autonomous Region reaches), due to its special geographical location and river flow direction, experienced ice floods triggered by ice jams and ice dams lead to dike-break and overtopping on the embankment, which resulted in huge casualties and property losses in history. Therefore, there isa growing need to develop capability in forecasting and analyzing river ice floods. Research about ice floods on the river is going on at the Yellow River Conservancy Commission, a numerical model is one of the essential parts of this research, which could supplement the inadequacies in the field and lab studies to help understand the physical processes of river ice. Based on the problem to be solved, the available data analysis on the Ning-Meng reach of the Yellow River, and literature review about ice models, HEC-RAS model and the YRCC River Ice Dynamic Model have been selected to conduct the numerical modelling for ice flood short-term prediction (2-3 days ahead) and middle-term prediction (10-15 days ahead) respectively. The HEC-RAS model can simulate ice floods under steady-state conditions. Based on the results of model calibration and verification, the result showed that good prediction could be achieved after model calibration. The YRCCRiver Ice Dynamic Model could be applied to simulate water level, discharge, water temperature, and ice cover thickness under unsteady-state conditions. Based on the sensitivity analysis about sensitive parameters, the model calibration was conducted, and acceptable results were achieved. Apart from that, different scenarios were designed to explore the model uncertainty, namely two bounds (5% and 95%) and probability distribution. The HEC-RAS model is based on the assumption of steady-state flow, therefore, the result of HEC-RAS model could be only used as reference value to support the decision-making. The YRCC River Ice Dynamic Model is under the assumption of unsteady-state flow, and according to the simulation result, it could show the basic regular pattern of ice floods reasonably, hence, the simulation result of YRCC River Ice Dynamic Model could be used to support the decision-making with high weight. The recommendation is that data and research shouldbe continued in order to support the models and measures improvements, such as extending the 1 dimensional models to 2 dimensional models, building an ice flood early warning system to support the decision-making, and other aspects
Semaphorin 7A restricts serotonergic innervation and ensures recovery after spinal cord injury.
No full textDescending serotonergic (5-HT) projections originating from the raphe nuclei form an important input to the spinal cord that control basic locomotion. The molecular signals that control this projection pattern are currently unknown. Here, we identify Semaphorin7A (Sema7A) as a critical cue that restricts serotonergic innervation in the spinal cord. Sema7A deficient mice show a marked increase in serotonergic fiber density in all layers of the spinal cord while the density of neurons expressing the corresponding 5-HTR2α receptor remains unchanged. These alterations appear to be successfully compensated as no obvious changes in rhythmic locomotion and skilled stepping are observed in adult mice. When the system is challenged with a spinal lesion, serotonergic innervation patterns in both Sema7A-deficient and -competent mice evolve over time with excessive innervation becoming most pronounced in the dorsal horn of Sema7A-deficient mice. These altered serotonergic innervation patterns correlate with diminished functional recovery that predominantly affects rhythmic locomotion. Our findings identify Sema7A as a critical regulator of serotonergic circuit formation in the injured spinal cord
Monitoring temporal changes of velocity and attenuation from ultrashort diffuse records
No full text<p>This repository contains the raw field data in the manuscript entitled "Monitoring temporal changes of velocity and attenuation from ultrashort diffuse records" by Ning Gu, Haoran Meng, Bo Yang, Xin Liu, Yehuda Ben-Zion, Junxin Guo, Bin Luo, Zhen Guo, Shuye Huang, Shichuan Yuan, Xiaofei Chen.</p>
Ning-Yun Liu Violin Recital Program Notes
No full textThis report includes two violin concertos from two different time periods: from the Viennese Classical period of 18th century is Mozart\ue2s Violin Concerto No, 5 in A Major, KV. 219; and from the 20th century is Barber\ue2s Violin Concerto, Op. 14. Both pieces are among the standard violin repertoire today.
This report will investigate the style of the composers, the compositional background, brief performance interpretation and the basic formal structure of these two works
FIGURE 2 in Fourier transform infrared spectroscopy (FTIR) characteristics of ancient amber artifacts of the Han Dynasty from Hunan, China
No full textFIGURE 2. Amber beads of the Han Dynasty from Hunan. A, Profile views of ZK14248. B, ZK14251, front and profile views. C, ZK14253; D, ZK14250, shattered bead with analyzed fragments. E, Broken amber bead (54changchenM010). F, Amber bead, SYS20220716-4. G, Amber bead SYS20220716-5. A–E, In collection of the Hunan Museum, Han Dynasty (202 BCE–220 CE). F and G, Amber beads obtained from local antique market or former private collection, presumed to be artifacts of the Han Dynasty, analyzed as references. Scale bars = 10mm.Published as part of LIU, QI, YUAN, YI-MENG, ZHANG, YAN-HUA, QIN, XUAN, YU, YAN-JIAO, WANG, HUI & XU, NING-NING, 2022, Fourier transform infrared spectroscopy (FTIR) characteristics of ancient amber artifacts of the Han Dynasty from Hunan, China, pp. 354-361 in Palaeoentomology 5 (4) on page 358, DOI: 10.11646/palaeoentomology.5.4.8, http://zenodo.org/record/733357
Passenger demand oriented train scheduling and rolling stock circulation planning for an urban rail transit line
No full textWe study the integration of train scheduling and rolling stock circulation planning under time-varying passenger demand for an urban rail transit line, where the practical train operation constraints, e.g., the capacity of trains, the number of available rolling stocks, and the entering/exiting depot operations, are considered. Three solution approaches are proposed to solve the resulting multi-objective mixed-integer nonlinear programming (MINLP) problem to deliver both an irregular train schedule (i.e., departure and arrival times of all train services) and a rolling stock circulation plan (including entering/exiting depot operations of rolling stocks and connections between train services) simultaneously. We first present an iterative nonlinear programming (INP) approach, where the solutions of the original MINLP problem are obtained by solving a nonlinear programming problem and a mixed integer linear programming (MILP) problem iteratively. Moreover, an equivalent MILP formulation of the original MINLP model is developed and an approximated MILP approach is proposed to reduce the number of constraints introduced by passenger demand. A case study is conducted based on the practical data of the Beijing Yizhuang line, where the three proposed approaches are compared with a state-of-the-art approach and a practical method used by the traffic planners. This comparison shows the effectiveness and efficiency of the three proposed approaches
Chinese Video Now
No full textChinese Video Now offers an exhilarating snapshot of a new generation of young artists working in China. Digital video technology lies at the heart of this extensive creative scene, whose ascent into the global arena reflects a wider Western upsurge of interest in all things China. The work of thirteen artists will feature across the gallery in a network of projections and monitor screens. Works include 8gg’s News Dance, 2005, a visceral re-mix of CCTV and news footage, Li Songhua’s Keynote Speech, 2005, in which his four year-old child re-enacts a political speech by Chinese President Hu Jintao, Meng Jin’s explorations of abandoned industrial spaces and much mor
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