浅谈竹笛音乐与气息和口型的关系

竹笛是一种传统的吹奏型乐器,其展现出来的音乐之美,魅力非凡,而且在很严谨传统的音乐表演里面都能展现出其艺术性的气息及魅力,而竹笛在进行演奏的时候,其音乐魅力能否完全展现,与其气息和口型的掌控程度息息相关,因此在竹笛演奏里面必须要重点关注这一点内容。本论文正是从这个背景入手,对竹笛演奏的气息和口型关系进行全面的阐述,并且指出竹笛演奏如何做好口型和气息的练习,从而全面展现竹笛的演奏艺术魅力。

唢呐音准问题及解决方法

唢呐演奏中常常发生音不准的问题,其中有客观因素,也有主观因素。本文从乐器调整、口型、气息控制、有针对性训练等方面,进行分析和论述,力求解决唢呐演奏中的音准问题。

CONSTRAINING FACTORS TO SUSTAINABLE UTILIZATION OF WATER RESOURCES AND THEIR COUNTERMEASURES IN CHINA

This paper discusses the constraining factors to sustainable utilization ofwater resources in China, and the countermeasures to realize sustainable water utilization. Theresult of comprehensive analysis shows that constraining factors to sustainable utilization of waterresources in China are complicated, including physical geographical factors and socio-economicfactors, such as uneven distribution of water resources at temporal and spatial scales,inappropriate institutional arrangement and non-water-saving and non-wter-conservation productionand life mode. The countermeasures against constraining factors to water resources sustainabledevelopment are put forward as follows: 1) using wetlands and forests, and through spatialconversion to realize temporally sustainable supply of water resources; 2) transferring waterbetween basins and areas and developing various water resources in water shortage area; 3)establishing water-saving society; 4) strengthening water pollution control and water resourcesprotection; and 5) establishing unified water resources management mechanism.

Three-Dimensional Water Quality Model Based on FVCOM for Total Load Control Management in Guan River Estuary,Northern Jiangsu Province

Guan River Estuary and adjacent coastal area(GREC) suffer from serious pollution and eutrophicational problems over the recent years.Thus,reducing the land-based load through the national pollutant total load control program and developing hydrodynamic and water quality models that can simulate the complex circulation and water quality kinetics within the system,including longitudinal and lateral variations in nutrient and COD concentrations,is a matter of urgency.In this study,a three-dimensional,hydrodynamic,water quality model was developed in GREC,Northern Jiangsu Province.The complex three-dimensional hydrodynamics of GREC were modeled using the unstructured-grid,finite-volume,free-surface,primitive equation coastal ocean circulation model(FVCOM).The water quality model was adapted from the mesocosm nutrients dynamic model in the south Yellow Sea and considers eight compartments:dissolved inorganic nitrogen,soluble reactive phosphorus(SRP),phytoplankton,zooplankton,detritus,dissolved organic nitrogen(DON),dissolved organic phosphorus(DOP),and chemical oxygen demand.The hydrodynamic and water quality models were calibrated and confirmed for 2012 and 2013.A comparison of the model simulations with extensive dataset shows that the models accurately simulate the longitudinal distribution of the hydrodynamics and water quality.The model can be used for total load control management to improve water quality in this area.

Fatigue strength of Al7075 notched plates based on the local SED averaged over a control volume

When pointed V-notches weaken structural components, local stresses are singular and their intensities are expressed in terms of the notch stress intensity factors （NSIFs）. These parameters have been widely used for fatigue assessments of welded struc- tures under high cycle fatigue and sharp notches in plates made of brittle materials subjected to static loading. Fine meshes are required to capture the asymptotic stress distributions ahead of the notch tip and evaluate the relevant NSIFs. On the other hand, when the aim is to determine the local Strain Energy Density （SED） averaged in a control volume embracing the point of stress singularity, refined meshes are, not at all, necessary. The SED can be evaluated from nodal displacements and regular coarse meshes provide accurate values for the averaged local SED. In the present contribution, the link between the SED and the NSIFs is discussed by considering some typical welded joints and sharp V-notches. The procedure based on the SED has been also proofed to be useful for determining theoretical stress concentration factors of blunt notches and holes. In the second part of this work an application of the strain energy density to the fatigue assessment of A17075 notched plates is presented. The experimental data are taken from the recent literature and refer to notched specimens subjected to different shot peening treatments aimed to increase the notch fatigue strength with respect to the parent material.

唢呐音准问题及解决方法

唢呐自七百多年前由我国西域地区传入中原地区以来,已经由少数民族乐器变成为家喻户晓应用范围很广的全民族乐器了。音准在琐呐演奏上是个难题,它涉及到较多因素,归纳起来有两个方面,即乐器和演奏者的控制能力。本文从乐器调整、口型、气息控制、有针对性训练等方面,进行分析和论述,力求解决唢呐演奏中的音准问题。

Analysis and control of a non-smooth population model with impulsive effects

In this paper, a non-smooth population model with impulsive effects is proposed by combining discontinuity and non-smoothness. According to the qualitative theory of differential equations, the global analysis of the model is discussed. Using the theory of impulsive differential equations, the existence conditions of order one periodic solution are obtained. And the impulsive controllers are designed to make the pest populations stay at the refuge level. Some simulations are carried out to prove the results.