融合载体动力学特征的智能多源自主导航方法研究

多源自主导航系统技术是新一代国家综合定位、导航与授时(PNT)体系下终端用户的重要技术发展方向。面向新一代健壮性综合PNT体系跨场景的导航任务,多源自主导航系统面临着智能化的迫切需求。针对复杂导航行为决策可信性问题,提出了融合载体动力学特征的智能多源自主导航基本概念,归纳了其实践中面临的主要科学问题,系统阐述了深度融合载体动力学特征与人工智能方法的多源自主导航理论框架与方法内涵,为智能多源自主导航系统的理论、方法及应用提供支撑。

把农村改革“二次飞跃”作为现代农业的强大动力和有效载体

现代农业发展到今天,取得巨大的成就,但同时也遇到一些深层次的矛盾和困扰,如何解决,该文分析提出要靠农村改革的"二次飞跃"加以推进和突破。各地在这些方面的率先实践,为积极探索农村改革的"二次飞跃"和现代农业的发展,提供了更多的有益范本,更深层次的实践和探索,还将会提供给我们更多的启示,揭示更多的带普遍意义的发展规律。

高血压疾病时血液系统L-精氨酸载体转运动力学的改变

目的 探讨原发性高血压 (EH)时人体血液系统 L -精氨酸 (L - Arginine,L - Arg)载体转运功能的改变 .方法 EH患者 12例及健康成年人 16例 ,提取血小板 (Pt)和红细胞(RBC) ,分别测定 Pt和 RBC的 L- Arg转运的动力学特征 .结果 EH患者 Pt和 RBC对 3H- L - Arg转运呈高亲和性载体转运方式 ,在不同浓度点 EH患者的 3H- L- Arg转运率均比对照组明显低下 (P<0 .0 1) .Eadie- Hofstee Plot分析 ,EH患者Pt L - Arg的最大转运速率 (Vmax)为对照组的 79% (P <0 .0 5 ) ,而 Pt3H- L - Arg转运的米氏常数值 (Km)无明显差异 .RBC的 L - Arg转运总能力 Y+ 载体转运系统的转运能力明显低于正常组 (P<0 .0 1) ,而 Y+ L载体转运系统的转运能力无明显改变 .L- Arg总转运的最大速率与 Y+载体转运系统的最大速率分别较对照组降低 36 .8%和 42 .5 % (P<0 .0 1) ,各组之间 Km 无明显差异 .结论 EH患者 Pt和 RBC L -

旋转锥式生物质热解系统及热载体动力学研究

：生物质是一种可再生的能源资源，通过热解液化技术可将生物质（木屑、秸杆、稻壳及甘蔗渣等）有机废弃物液化为生物质油．本文介绍了自行设计的以旋转锥反应器为核心的闪速热解系统及反应器的工作原理，并对热载体在反应器内的动力学进行了分析．该系统可确定热载体在旋转锥不同锥角、不同旋转角频率ｗ下，足以影响生物质油产率的重要参数一一固体滞留期ｔ，为反应器的设计提供了极为方便的计算方法．

劳动力产权的界定、特点及层次性分析

劳动力产权是当前我国经济学界研究的一个热点问题。但由于对劳动力产权缺乏统一和科学的界定以及深层次的理论分析 ,因此难以建立科学的劳动力产权理论。本文从对产权和劳动力的内涵分析出发 ,指出了当前学术界对劳动力产权界定中存在的问题 ,在此基础上对劳动力产权作了新的界定及分析了劳动力产权的特点 ,并进一步对劳动力产权进行了层次性分析。

文化发展的动力学机制

文化作为社会形态内的一个他组织系统 ,其演化过程存在静力学和动力学两种状态。在界定了文化、文化发展等概念的内涵以后 ,应深入研究包括动力的源起、动力的载体、动力的传承路径等内容在内的文化发展的动力学机制。

注入温度对复合热载体吞吐效果影响

针对大庆萨北过渡带,在模拟实际油藏条件下开展复合热载体吞吐室内试验研究。结果表明:该油田进行复合热载体吞吐可取得较好的开采效果。复合热载体吞吐中,随着注入温度增加,采收率、含水率增加,生产油气比降低。第3周期开始当温度达到280℃后,采收率开始下降;随着吞吐周期增加,采收率、含水率增加,生产油气比变化不大。三个周期后采收率、含水率降低,生产气油比增加。通过不同吞吐温度、五个周期的吞吐效果比较,复合热载体注入280℃的吞吐效果比较好,吞吐3周期。

Use of the finite elements method for modelling the dynamic load impact on hydraulic leg equipped with gas accumulator

Procedures of preparation of numerical analysis,consisting in a simulation of cooperation of three different media: steel,liquid and gas undergoes dynamic load were discussed.Modelling of the initial static load of the mechanical system was presented.By using the MSC.Software products the following exemplary computer simulations were made: dynamic load impact on the hydraulic leg as well as effectiveness of the hydraulic leg protection against overload with help of gas accumulator.

Investigation of the Effect of Bulbuos Bow of Containership in Head Waves Using CFD

Reynold＇s averaged Navier-Stokes based CFD （computational fluid dynamics） technique WISDAM developed at The University of Tokyo is used to investigate and compare the hydrodynamic loads on container ship models SR108 and KCS in 120 degree regular oblique wave conditions. WISDAM has the capability of handling 6DOF （six degrees of freedom） in ship motions. Finite volume method with structured and overlapping grid system is employed. The flow variables are described in staggered manner, i.e., velocity components arc defined at the face center while pressure is at the cell center. Computational results agree favorably well with existing towing tank results especially for ship motions. Computational results also show that ship with bulbous bow experience higher hydrodynamic loads on bow section.

Inconsistence of Non-Singular Spherically Symmetric Solution and a Satisfactory Energy-Momentum Complex

Two spherically symmetric non-singular black hole solutions in Moiler tetrad theory of gravitation have been obtained. Although the two solutions have the same form of metric （spherically symmetric nonsingular black hole）, their energy contents are different. We use another method given by Gibbons and Hawking to calculate the energy content of these solutions. We also obtained different value of energy. Study the requirements of a satisfactory energymomentum complex given by Moiler we find that the second solution, which behaves as 1/√r, is not transformed as a four-vector under Lorentz transformation.

Kinetic modelling of NO+CO reaction on Pt/MoO_x/Al_2O_3 catalyst

A mathematical model has been developed to describe the dynamic behaviours of NO+CO reaction on supported Pt MO catalyst. The ignited state kinetics can be fit quantitatively using directly a Langmuir Henshelwood bimolecular rate expression with a heat of adsorption of NO of 32 4 kJ/mol and of CO of 106 7 kJ/mol, respectively.

Engine Noise Prediction by Using Multi-body Simulation

Abstract： This paper presents a coupled multi-body and FEM （finite element method）-BEM （boundary element method） methodology used to carry out a comprehensive NVH （noise, vibration and harshness） investigation of a four-cylinder internal combustion engine prototype. Firstly, a MBDS （multi-body dynamic simulation） of the internal combustion engine has been carried out, at a defined operating condition, in order to determine the excitation force of the powertrain exciting the cylinder block. In this way, the dynamics of the engine powertrain have been described taking into account both the effects of the gas forces of the combustion process and the inertia forces of the moving parts. Afterwards, the cylinder block excitation forces have been used to evaluate the engine block vibrations and to predict the external noise radiated with both the well-known ATV （acoustic transfer vectors） and MATV （modal acoustic transfer vectors） methodologies at a distance of 1 m from the engine, according to the standard ISO 3744. The dynamics of the engine powertrain and its vibro-acoustic behaviour have been described using LMS （learning management system） Engineering Innovation Virtual.Lab tools.

Pore Water Pressure Arising during Pile Drilling in Sand

The pile working load depends on the imperfections which may be taken place in pile-soil system, during pile construction, among many other factors. This subject attracted the researcher＇s attention world wide in the last decades. Types of imperfections either geotechnical or structural are documented in literature and well explained. Nevertheless, the influence of these imperfections in pile load calculations is still ambiguous. The work presented herein is devoted to study soil disturbance during construction of piles using continuous flight auger, CFA. The study of soil disturbance due to drilling needs some evidence. The source of this evidence is field observations collected from four different construction sites, which are documented in this paper. The study concluded that the disturbed zone of soil by CFA has a conical shape and extending laterally to a distance equivalent to ten times of the pile diameter around the auger at the cutting bits and has an inclined surface of4：1 （vertical ： horizontal）. Furthermore excess pore water pressure was induced in soil in the vicinity of pile drilling. Due to this excess pore water pressure, 3.5% to 6.5% of piles constructed by CFA showed percolation of water from the top of the piles through fresh concrete. Also, subsidence of fresh concrete in pile hole was recorded in few of the constructed piles. Pile loading tests showed that the percolation of water and/or subsidence of fresh concrete have not appreciable influence on the load-displacement characteristics of the piles. Moreover, percolation of water at pile heads.

Moored Ship Motions due to Tropical Cyclone Linda

Severe wind-wave due to tropical cyclone Linda can cause port downtime which affects port operations such as berthing, mooting and （un）loading of the ship. The ship motions are criteria for limiting the port operations, human safety and preventing the damage of port equipment and furniture. Therefore, this study discusses moored ship motions due to severe wind-wave during the tropical cyclone Linda which entered the Gulf of Thailand in November 1997. The ship motions are represented in the moored ship analysis at SRH （Sriracha Harbour Port） and BLCP （BLCP Coal-Fired Power Plant Port）, and are subject to the static environmental load on the ship in accordance with Spanish Standard （ROM 0.2-1990） [1]. The environment in numerical model is derived from the wave model and hydrodynamics model using the application of Delft3D-WAVE and Delft3D-FLOW. The model location includes Ao Udom Bay and Rayong Sea. The model results represent the environment at Rayong Sea which is more severe than Ao Udom Bay. The ship motions at BLCP are mostly larger than SRH.

Taking Comprehensive Practice Activities as the Carrier to Improve College English Teaching Efficiency

The so-called comprehensive practice activities refer to that under teachers＇ guidance, students conduct independent comprehensive learning activities, and in activities, students can train practice ability, organically combining theory knowledge and practice knowledge together, in order to have a learning and practice effect. In current college English teaching, it exists module, single and dogmatic and a series of disadvantage trends, taking comprehensive practice activities as the carrier to improve college English teaching efficiency, which has a multiplier effect. This paper first analyzes the importance of comprehensive practical activities in college English teaching activities, and then it proposes a set of practicable activity strategies, hoping to play a valuable role.

Preparation of the nanostructured lipid carriers of artemisinin and its pharmacokinetic evaluation

Artemisinin（ART） is a widely used active drug for malaria, including severe and cerebral malaria. However, its therapeutic efficacy is affected by its lower bioavailability. In the present study, nanostructured lipid carriers（NLCs） were proposed as carrier of ART to improve pharmacokinetic properties of the drug. ART-NLC was prepared by high-pressure homogenization based on orthogonal design. The particle size, zeta potential, encapsulation efficiency（EE） and percentage of drug loading（DL） of ART-NLC were（53.06±2.11） nm,（–28.7±3.59） m V, 73.9%±0.5% and 11.23%±0.37%, respectively. ART-NLC showed the sustained release characteristics and scarcely the hemolysis effect on human red blood cells. The pharmacokinetics of ART-NLC for rats after tail intravenous injection（i.v） or intraperitoneal injection（i.p） were investigated by liquid chromatography-tandem mass spectroscopy（LC-MS/MS）. And ART solution was designed as control preparation. For rats of i.v groups, the AUC0–∞（（707.45±145.65） ng·h/m L） of ART-NLC were significantly bigger than that of ART（（368.98±139.58） ng·h/m L）. The MRT（（3.38±0.46） h） of ART-NLC was longer than that of ART（（1.39±0.61） h）. And similar results were observed for rats of i.p groups. The AUC0–∞（（1233.06±235.57） ng·h/m L） and MRT（（4.97±0.69） h） of ART-NLC were both bigger than those of ART, which were（871.17±234.03） ng·h/m L） and（1.75±0.31） h）, respectively. Compared with ART, ART-NLC showed a significant increase in AUC0–∞（P〈0.05） and MRT（P〈0.001） for both i.p and tail i.v administrations.

Dynamic modeling of a wave glider

We propose a method to establish a dynamic model for a wave glider, a wave-propelled sea surface vehicle that can make use of wave energy to obtain thrust. The vehicle, composed of a surface float and a submerged glider in sea water, is regarded as a two-particle system. Kane＇s equations are used to establish the dynamic model. To verify the model, the design of a testing prototype is proposed and pool trials are conducted. The speeds of the vehicle under different sea conditions can be computed using the model, which is verified by pool trials. The optimal structure parameters useful for vehicle designs can also be obtained from the model. We illustrate how to build an analytical dynamics model for the wave glider, which is a crucial basis for the vehicle＇s motion control. The dynamics model also provides foundations for an off-line simulation of vehicle performance and the optimization of its mechanical designs.

Test technology research and fatigue damage prediction of a car body based on dynamic simulation load spectrum

The dynamic model of a high-speed electric multiple unit(EMU)is established based on the theory of rigid-flexible coupling multi-body system dynamics.Depending on the actual operating conditions of the vehicle,there are a variety of conditions of car body load-time history.We assess ineffective amplitude omission,load spectrum extrapolation,and extreme determination through the car body load-time history,and then obtain the car body fatigue load block spectrum.Finally,we perform a fatigue strength test on the whole car body on a car body fatigue test bench.It is shown that the accelerations of the three directions of the vehicle car body increase with increasing speed.When the train passes a curve,the lateral acceleration average becomes greater.There is also an increase in the car body accelerations in three directions when the train goes through a turnout or twisted line.Under the condition of a failed spring,the vertical acceleration of the car body is obviously increased.Anti-yaw damper failure will cause a significant increase in vehicle lateral acceleration.The failure of lateral and vertical dampers on the second suspension causes an insignificant acceleration increase in three directions.The car body acceleration increases the wear-type profile relative to the original profile in various working and speed level conditions a little.The influence on the damage of vehicle car body under various working conditions is predicted according to the obtained load spectrum.

On multi-transitivity with respect to a vector

A topological dynamical system(X,f)is said to be multi-transitive if for every n∈N the system(Xn,f×f2××fn)is transitive.We introduce the concept of multi-transitivity with respect to a vector and show that multi-transitivity can be characterized by the hitting time sets of open sets,answering a question proposed by Kwietniak and Oprocha(2012).We also show that multi-transitive systems are Li-Yorke chaotic.

Experimental study on hydrodynamic effect of orientation micro-pored surfaces

The orientation of the dimple increases the flow distance in the dimple and produces fluid cumulative effect in the dimple length direction, which leads to obvious hydrodynamic effect as a result. In order to investigate the hydrodynamic effect of orientation dimples, a series of experiments was carried out on a ring-on-ring test. Multi-pored faces were tested with different dimple inclination angles and slender ratios. Film thickness and frictional torque were measured under different conditions of load and rotation speed. Experimental results showed that the orientation dimple could produce obvious dynamic effect by change of the flow direction and the increasing dimple orientation leads to increase of the load capability. The hydrodynamic effect strongly depends on dimple orientation parameters such as inclination angle and slender ratio. A larger load capability can be available by increasing dimple orientation and rotation speed. Experimental results agreed well with the theory that orientation micro-pores can significantly improve hydrodynamic performance of surfaces.