Research on wave regimes at the Cua Dai estuary, Quang Nam

In coastal area of the Cua Dai estuary - Quang Nam province, the processes of erosion-accretion strongly occur. Over this area, the ocean wave is a dynamical factor that directly affects the coastal areas causing erosion-accretion processes. This paper presents an evaluation of the ocean wave regime impacting the areas of Cua Dai estuary by using the model of MIKE21SW. The purpose of this study is to fully interprete the role of dynamical factor, ocean wave in erosion-accretion processes. The results showed a convergence of ocean waves at the estuary of Cua Dai although it is obstructed by the Cu Lao Cham island in front of the Cua Dai estuary. The northeast and north-northeast waves are mainly prevailing with the frequency of more than 60% in the year.

Impact of gravity wave drag on the thermospheric circulation: implementation of a nonlinear gravity wave parameterization in a whole-atmosphere model

To investigate the effects of the gravity wave (GW) drag on the general circulation in the thermosphere, a nonlinear GW parameterization that estimates the GW drag in the whole-atmosphere system is implemented in a whole-atmosphere general circulation model (GCM). Comparing the simulation results obtained with the whole-atmosphere scheme with the ones obtained with a conventional linear scheme, we study the GW effects on the thermospheric dynamics for solstice conditions. The GW drag significantly decelerates the mean zonal wind in the thermosphere. The GWs attenuate the migrating semidiurnal solar-tide (SW2) amplitude in the lower thermosphere and modify the latitudinal structure of the SW2 above a 150 km height. The SW2 simulated by the GCM based on the nonlinear whole-atmosphere scheme agrees well with the observed SW2. The GW drag in the lower thermosphere has zonal wavenumber 2 and semidiurnal variation, while the GW drag above a 150 km height is enhanced in high latitude. The GW drag in the thermosphere is a significant dynamical factor and plays an important role in the momentum budget of the thermosphere. Therefore, a GW parameterization accounting for thermospheric processes is essential for coarse-grid whole-atmosphere GCMs in order to more realistically simulate the atmosphere–ionosphere system.

Research on Chaos Feature and Forecasting of Air Conditioning Load

Evolution law on air conditioning load is affected by many factors which are very difficult to be known and gained, that which results in low precision of simulation and forecast. Based on analysis on chaos characteristic of air conditioning load time series, BP neural networks model based on chaos phase space is proposed to forecast air conditioning load through embedding dimension. Considering influence of dynamical factor of air conditioning load as well as difficulty of calculating number of input cell, the model is provided with strong nonlinear mapping capacity, is applied to simulate and forecast air conditioning load, the outcomes is reasonable and higher precision.

STATIONARY RANK-SIZE RELATION FOR COMMUNITY OF LOGISTICALLY GROWING GROUPS

Rank-size relation derived from the size distribution for a number of growing groups is considered with a mathematical model described by a type of von Foerster equation. Size of each group grows in the logistic manner with the common intrinsic growth rate and carrying capacity. New groups are produced from present groups with a reproduction rate, which depends on the size of the mother group. Each group undergoes the extinction probability which depends on the group size. We discuss how the characteristics of some typical rank-size relations of the community of groups depend on the dynamical factors governing the community. It is shown that the typical rank-size relation requires specific form of the size-dependence of extinction rate, and we discuss how the observed typical rank-size relation could really reflect the dynamical factor governing the community.

Quantitative analysis of diffuse scattering with imaging plate

The excellent properties of the imaging plate (IP), i.e., a wide dynamic range and good linearity for the electron intensity, are promising for quantitative analysis of diffuse scattering since they allow a small dynamical diffraction effect to be evaluated with ‘dynamical factor’. In this paper, we first present accurate measurement of thermal diffuse scattering (TDS), which contributes dominantly to the background of electron diffraction patterns. Secondly, we present a method of extracting weak signal scattering intensities from the background, and apply it to the analysis of diffuse scattering caused from short-range ordered structures.Electron microscope images were obtained with a JEM-2000EXII electron microscope. Image processing was carried out by using a computer system (ACOS 2020) at Tohoku University. Electron diffraction patterns were recorded by using the TEM-IP system (PIXsysTEM). The details of the IP data handling were presented in the previous paper.Figure 1 shows an electron diffraction pattern obtained from an Au thin film ( t ∼ 40nm) at room temperature.