Understanding of the formative conditions fluvial bedforms is significant for both river management and geological studies. Diagrams showing bedform stability have been widely used analyses sedimentary structures. However, use discriminants to determine boundaries different regimes has not yet explored. In this study, we discriminant functions describe a range in 3‐D dimensionless parametric space. We do by means analysis using Mahalanobis distance. analyzed 3,793 available laboratory field...

ABSTRACT Sedimentary bedforms such as ripples and dunes are generated both by river flows sediment‐laden gravity currents. Gravity current deposits usually parameterized using existing bedform phase diagrams which based on data from laboratory experiments field observations of open‐channel flows. Yet, it is not evident that flow applicable to deposits. hydrodynamics dependent vertical density variation, stratification, therefore fundamentally different New produce conducted compared data. It...

We study the behavior of a confined stream made two immiscible fluids when it reaches T junction. Two flow patterns are witnessed: is either directed in only one sidearm, yielding preferential pathway for dispersed phase, or splits between both. show that selection these not triggered by shape junction nor capillary effects, but results from confinement. It can be anticipated terms hydrodynamic properties flow. A simple model universal relevant adimensional parameters problem presented and discussed.

The interaction between turbidity currents and mobile substrates can lead to the development of different types bedforms. Although much research has been conducted on bedform beneath open channel flows, into waning gravity is relatively rare. Analysis density current-related therefore relied upon flow phase diagrams. We report an experimental study designed assess bedforms under steady saline currents. developed stepped profiles in which a higher-density basal zone was separated from ambient...

Abstract Sedimentary structures in ancient deposits are clues to reconstruct past geohazards. While parallel lamination formed by plane beds is one of the most common sedimentary event such as turbidites, formative conditions for remain unclear. In literature, two types (upper and lower beds) exist supposed develop under different shear stresses, particle sizes, flow regimes. Here, we present new phase diagrams based on compilation existing data regarding hydraulic clarify formation...

[目的]本研究の目的はドロップジャンプ(以下DJ)時の下肢の運動学的特徴とStretch-shortening cycle(以下SSC)を跳躍に利用する能力との関係を調べることである。[対象]対象は健常男性28名とした。[方法]20 cm DJ時における下肢関節角度の変化に加え,垂直跳び(以下VJ)とDJの跳躍高を測定した。DJ時の関節角度の変化より,着地直前と踏切動作時の関節角度,踏切動作時の足関節運動の切り換わりから膝関節運動の切り換わりまでの時間を算出した。VJよりDJ跳躍高が増加した群と減少した群に分類し,両群の違いを比較した。[結果]増加した群は,着地直前の足関節底屈角度が有意に少なかった。また,足関節の切り換わりから膝関節の切り換わりまでの時間が有意に長く,足関節が膝関節より早く切り換わるものが多かった。[結語]少ない足関節底屈角度での着地に加え,足関節を膝関節より早く伸展運動に切り換えるような踏切動作をとることでSSCを効率的に利用したDJを行うことができることが示唆された。

Abstract. Plane beds develop under flows in fluvial and marine environments; they are recorded as parallel lamination sandstone beds, such those found turbidites. However, whereas turbidites typically exhibit lamination, rarely feature dune-scale cross lamination. Although the reason for scarcity of cross-lamination is still debated, formation dunes may be dampened by suspended load. Here, we perform, first time, linear stability analysis to show that with load facilitate plane beds. For a...

A nonlinear adaptive control algorithm is designed for a two-wheeled car by combining algorithms of receding horizon and moving state estimation. The experimental results show that the proposed can be implemented with sampling frequency 30 Hz works satisfactorily.

Abstract. Plane beds develop under flows in fluvial and marine environments; they are recorded as parallel lamination sandstone beds, such those found turbidites. However, whereas turbidites typically exhibit lamination, rarely feature dune-scale cross lamination. Although the reason for scarcity of cross-lamination is still debated, formation dunes may be dampened by suspended load. Here, we perform, first time, linear stability analysis to show that with load facilitate plane beds. For a...

Abstract. Plane beds develop under flows in fluvial and marine environments; they are recorded as parallel lamination sandstone beds, such those found turbidites. However, whereas turbidites typically exhibit lamination, rarely feature dune-scale cross-lamination. Although the reason for scarcity of cross-lamination is still debated, formation dunes may be dampened by suspended loads. Here, we perform, first time, linear-stability analysis to show that with loads facilitate plane beds. For a...

We propose an algorithm for nonlinear receding-horizon output feedback control by combining a real-time optimal state and estimation algorithm. The algorithms of are obtained minimizing performance indexes. Application the stabilized continuation method results in that do not involve any successive approximation methods. Simulation 2-wheeled car clarify characteristics

Speedy and accurate positioning is important for mechatronics products. It necessary optimum design to analyze the combination of dynamics servomechanisms. This paper describes simulation program application linear slider. The considered charactristics a mechanical structure, control system, distributed forces. A multi-degree-of-freedom structure easily modelled by FEM. FEM model joined transfer functions using this program. Analytical are frequency response, transient stability. Finally, we...

This study proposes a new definition of plane bed regimes. The upper is defined as flat bedform that appears under conditions active suspended load, whereas the lower forms when sediment particles are moved only by bed-load. Previous studies have recognized two types could be distinguished shear stress, particle size, or flow regime. However, compilation large amount existing open-channel data indicates regimes cannot differentiated definitions. Newly produced phase diagrams indicate plot in...