As a promising chemical-enhanced oil recovery method (CEOR), switchable acetamidine surfactant flooding is investigated in sandstone reservoirs. To describe the distributions of injected water during flooding, long-time and multifrequency NMR scanning was employed combination with core displacement experiments. We found that saturation increased swept volume improved injection rates increasing from 0.01 to 0.5 mL/min all pores. During rate distribution had positive correlation. The as...

Herein, triphenyltin (TPT) biodegradation efficiency and its transformation pathway have been elucidated. To better understand the molecular mechanism of TPT degradation, interactions between amino acids, primary structures, quaternary conformations effector proteins were studied. The results verified that recognition binding depended on acid sequences but not secondary, tertiary or protein structure. During this process, could change weight isoelectric point proteins, induce their...

There are many factors controlling coalbed methane (CBM) accumulation. So, it is fundamental for CBM exploration and development to identify these investigate their control mechanism. Through statistical analysis of experimental field test data, the basin tectonic evolution, sedimentary environments hydrodynamic conditions comprehensively analyzed, gas mechanism three main (structure, sedimentation force) discussed. Results show that evolutions complicated process reservoir formation....

In this paper we will present a vector polar histogram method for obstacle avoidance planning of autonomous underwater vehicle (Abbr. AUV), which is based on sonar measurement. By applying new method, can solve the local minimum and frequent vibration problem in potential field overcome shortcoming enhanced where different effect obstacles various directions AUV motion not considered real-time speed neglected construction threshold function. This much more suitable calculation optimal moving...

MAC protocols determine the way in which channels are shared between nodes[1]. In order to reduce and avoid data packet conflicting, a control mechanism needs be determined allocate use of channel resources reasonably. The main task protocol is prevent or resolve collision packets, while providing energy efficiency, low access delays fairness among nodes network[2].

A deceleration guidance law is developed for a reentry warhead with fixed angle of attack by body geometry and single moving-mass attitude control. The model equations, including the dynamic equations two-body system kinematic between target, which form basis study, are presented. To analyze model, simplified new variables introduced. By simplifying transfer functions from lateral position internal mass to error obtained. Iteration used control terminal velocity at desired value. For studied...

In order to simplify the design of path tracking controller and solve problem relating nonlinear dynamic model autonomous underwater vehicle motion planning, feedback linearization method is first adopted transform into an equivalent pseudo-linear in horizontal coordinates. Then considering wave disturbance effect, mixed-sensitivity H ∞ robust control applied state-feedback for this model. Finally, law transformed state (surge velocity yaw angular rate) through inverse coordinate...

The purpose of this report was to perform an experimental evaluation enhanced oil recovery (EOR) using CO 2 injection. A slim tube test and PVT experiment are used determine the minimum miscibility pressure as well a few related physical properties. Combined with long core displacement nuclear magnetic resonance, flooding -water alternate simulated, efficiency different types pores is evaluated. results indicate that 32.6 MPa, at near-miscible conditions current formation pressure....

Argillaceous rock is encountered in a variety of engineering circumstances such as civil and petroleum engineering; good understanding the hydromechanical behavior involved crucial importance. However, characterization this challenging: it exhibits complex coupled thermo-hydro-chemo-mechanical multi-heterogeneity, description which would strongly benefit from an improved experimental insight on their deformation damage mechanisms at micro-scale. We propose here method for micro-scale...

Considering the handling system with vehicle-mounted manipulator has some shortcoming such as large load, low flexible and efficiency, a kind of automatic ARM is designed. The realizes loading-carrying-unloading automatically, using cooperative work different robot. With sensor, can load unload automatically. periodic designing intelligent vehicle accomplish carriage goods. processor used to achieve motion control mechanical arm vehicle. experiment product designed, it proved that efficient...