喷射钻流体系统分析

本文结合SPZ型深孔喷射钻具的研制与实验,着重分析了喷射效应在钻削过程中的应用,建立了流体系统的数学关系式,为深孔喷射钻的设计提供了必要的理论依据。

MEMS和微流体分析系统的发展

微机电系统 (MEMS)是在微电子及微机械等学科基础上发展起来的新兴多学科交叉研究领域 ,是当今科学技术最具潜力的发展方向之一 ,而微型流体分析系统是这一研究领域中的热点。本文综述了MEMS技术以及作为MEMS技术一个重要研究方向的微型流体分析系统的起源及其广阔的市场应用前景 ,并对MEMS产品的市场化存在的问题进行了讨论。MEMS技术及微型流体分析系统的诞生必将对今后的化学、医学及生物学等领域的研究工作产生重大影响。

流体包裹体多参数综合划分东营凹陷沙三段油气充注期次及充注时期确定

对采自东营凹陷沙河街组第三段（沙三段，Es3）223块流体包裹体薄片进行了有机包裹体产状观察、显徽荧光光谱分析和显微测温等流体包裹体系统分析。综合分析这些参数表明沙三段发育3期油气充注：第一期发生在成岩早期．主要为发橙黄色荧光的低成熟油气充注；第二期发生在成岩中期．主要为发淡黄色荧光的成熟油气充注；第三期发生在成岩作用晚期．主要为发蓝白色荧光的高成熟油气充注。在此基础上．运用埋藏吏一均一温度投影法确定了这3期油气的宽注对期：第一期为36～24Ma；第二期为13．8～8．0Ma；第三期为8．0～0Ma。

运用FPAS研究琼东南盆地松东地区气势

地层流体受两大流体系统的控制——压实流和重力流。利用流体势分析系统(简称FPAS)研究地下流体势及压力分布可克服井资料不系统的局限性,以便有效地进行油气资源的预测评价。综合研究区剖面、平面流体势及压力特征并结合其他有关地质资料,找出了最有利的勘探目的层位。FPAS在琼东南盆地松东地区取得了良好的效果。

最新国外测井专利

具有使用原子层沉积形成的集成计算元件的流体分析系统 Fluid analysis systems with Integrated Computation Elements （ICEs） or other optical path components formed using atomic layerdeposition （ALD） enables improved tolerances and design flexibility. In some of the disclosed embodiments, a fluid analysis systemincludes a light source and an ICE. The fluid analysis system also includes a detector that converts optical signals to electrical signals.The ICE comprises a plurality of optical layers, where at least one of the plurality of optical layers is formed using ALD. A relatedmethod includes selecting an ICE design having a plurality of optical layers. The method also includes forming at least one of theplurality of optical layers of the ICE using ALD to enable prediction of a chemical or physical property of a substance. A related loggingstring includes a logging tool section and a fluid analysis tool associated with the logging tool section. The fluid analysis tool includes anICE with at least one optical layer formed using ALD.

DC Characteristics of Lattice-Matched InAlN/AlN/GaN High Electron Mobility Transistors

Lattice-matched InAlN/AlN/GaN high electron mobility transistors (HEMTs) grown on sapphire substrate by using low-pressure metallorganic chemical vapor deposition were prepared, and the comprehensive DC characteristics were implemented by Keithley 4200 Semiconductor Characterization System. The experimental results indicated that a maximum drain current over 400 mA/mm and a peak external transconductance of 215 mS/mm can be achieved in the initial HEMTs. However, after the devices endured a 10-h thermal aging in furnace under nitrogen condition at 300 ℃, the maximum reduction of saturation drain current and external transconductance at high gate-source voltage and drain-source voltage were 30% and 35%, respectively. Additionally, an increased drain-source leakage current was observed at three-terminal off-state. It was inferred that the degradation was mainly related to electron-trapping defects in the InAlN barrier layer.

Recent progress in the application of microfluidic systems and gold nanoparticles in immunoassays

Immunoassays are useful for many bioassays. Many new techniques and materials are introduced into the immunoassay to improve the efficiency. This paper reviews recent progress in the application of microfluidic systems and gold nanoparticles in immunoassay. The micro/nano technologies and materials can offer good sensitivity, fast detection, cost-effectiveness and easy signal readout. In particular, the miniaturization of microfluidics and colorimetric assays based on gold nanoparticles have dramatically improved the efficiency of immunoassays.

Heteroclinic bifurcations in attitude maneuver of coupled slosh-spacecraft with flexible appendage

In this paper, the chaotic dynamics in an attitude transition maneuver of a slosh-spacecraft coupled with flexible appendage in going from minor axis to major axis spin under the influence of dissipative effects due to fuel slosh and a small flexible appendage constrained to only torsional vibration is investigated. The slosh-spacecraft coupled with flexible appendage in attitude maneuver carrying a sloshing liquid is considered as multi-body system with the sloshing motion modeled as a spherical pendulum. The focus in this paper is that the dynamics of the liquid and flexible appendage vibration are coupled. The equations of motion are derived and transformed into a form suitable for the application of Melnikov’s method. Melnikov’s integral is used to predict the transversal intersections of the stable and unstable manifolds for the perturbed system. An analytical criterion for chaotic motion is derived in terms of system parameters. This criterion is evaluated for its significance to the design of spacecraft. The dependence of the onset of chaos on quantities such as body shape and magnitude of damping values, fuel fraction and torsional vibration frequency of flexible appendage are investigated. In addition, we show that a spacecraft carrying a sloshing liquid, after passive reorientation maneuver, will end up with periodic limit motion other than a final major axis spin because of the intrinsic non-linearity of fuel slosh. Furthermore, an extensive numerical simulation is carried out to validate the Melnikov’s analytical result.

Diversification of Sisorid catfishes(Teleostei: Siluriformes)in relation to the orogeny of the Himalayan Plateau

Abstract Sisorid catfishes are primarily limited in distribution to rivers of the Himalayan region and Tibetan Plateau. These species have external morphologies that are adapted for extremely fast-flowing riverine systems. Given the diversity of the group and the above qualities of these catfishes, this lineage serves as an ideal group for inferring the geological history of this region based on their phylogenetic relationships reflecting evolu- tionary history. We sequenced the complete mitochondrial genome and four nuclear genes of representative sisorids distributed across river systems in China. Phylogenetic analyses strongly support the monophyly of the Sisoridae and the glyptosternoids. An analysis of the reconstructed ancestral states derived from inferred genealogical relationships suggests that the evolution of this lineage was accompanied by convergent evolution in morphological traits that were presumably in response to environmental pressure involving the rapid flowing river system that were generated during the uplift of the Tibetan Plateau （UTP）. Molecular dating indicates that the Chinese sisorids and the glyptosternoids originated at the later Miocene （~ 10.9-9.8 Mya）, and with further biogeographic analyses indicates that the species of Sisoridae likely originated from a widely distributed ancestor. Moreover, the divergence of the Sisoridae in China can be divided into two phases consis- tent with the UTP. All of these results indicate that the diversification and dispersal events in this lineage occurred as a result of drainage systems formed during and after the UTP in the late Miocene and Quaternary periods.

Modeling on effervescent atomization:A review

The study and modeling process of effervescent atomization are reviewed. The mechanism of droplet events and the treatment of liquid fragmentation process and dispersed particles are systematically presented, which includes the primary atomization of Newtonian and non-Newtonian fluid, instability analysis, turbulence treatment, particle tracking, secondary atomization and droplets collision. The review on the sub-models involved in the simulation of effervescence is followed by a summary of the achievements of modeling. First is the validation of models; then the parametric study is summarized; the third part introduces the fitting formula of droplet mean size and impinging factors, and finally the scope of future study is indicated.

Characteristic analysis of hydraulic hybrid vehicle based on limit cycle

The theory of limit cycles was applied to hydraulic hybrid vehicle (HHV) to analyze the dynamic characteristics of the system. The exact mathematical models based on configuration diagram of HHV were built to study on equilibrium points, nonexistence of limit cycle and stability of equilibrium points. The analysis showed that if the Young's modulus of fluid is neglected, the equilibrium points of the system will be distributed on both sides of the initial function. In addition, there is a unique equilibrium point according to the practical signification of the system parameters. The nonexistence analysis showed that there is no limit cycle for the system, no matter how the viscosity coefficient B changes. The stability analysis of equilibrium points showed that the system is asymptotically stable about the equilibrium point at B≥0 and the equilibrium point is the center point of the system at B=0. Finally, the phase diagrams of global topological structure of HHV system were entirely described according to qualitative analysis of the singular points at infinity.