高职文科生核心技能培养初探

高职学生的核心技能通常被冠以“动手能力”，但对这一概念的窄化，使之倾向于以“动手”为介质的各项技能，这给文科高职院校确定自身办学特色和培养定位带来了困惑。为明晰高职文科生的核心技能，文章在对文理科高职院校进行对比分析的基础上，提出“动口能力”是高职文科生核心技能的重要体现。

Numerical assessment on improving multistage centrifugal impeller performance by changing inlet skew angle at impeller inlet

Multistage centrifugal impellers with four different skew angles were investigated by using computational fluid dynamics.The purpose of this work is to investigate the influences of lean angle at the blade tip of the impeller inlet.Four variations of lean angles,that is,8°,10°,15° and 20°,were made at first stage impeller.Reynolds Average Navier Stokes equation was used in simulation together with a shear?stress transport(SST) k-w turbulence model and mixing-plane approach,respectively.Three dimensional fluid flows were simplified using periodic model to reduce the computational cost and time required.A good performance was expected that the secondary flow can be effectively reduced in the flow passage of the impeller without excessive increase in manufacturing cost caused by the secondary flow.The results show that secondary flow affects the main flow intricately to form vortices or having non-uniform velocity in the flow passage,which in turn results in substantial fluid energy loss not only in the impeller but also in the guide vane downstream of impeller.The numerical solutions were performed and allowed the optimum design and operating conditions to be obtained.

A SURVEY STUDY ON STUDENTS' BELIEFS ABOUT ENGLISH-DORMITORY PRACTICE—A REPORT FROM THE IEDC PROGRAM

The article is to get some feedbacks from students on the efficiency of the E-Dorm practice in improving their oral ability and factors influencing their oral development. Empirical evidence provided by the survey indicate that college students' low proficiency in speaking is due to the traditional teaching method and students' attitudes to oral English practice play an important role in their engagement in the practice, and above all, E-Dorm practice proves to be an satisfying way to enhance students' oral ability by creating a more natural language setting for students after class and forcing teachers to use a new-brand communicative competence approach in class. At last, the author gives some suggestions for researchers to achieve an ideal goal in this field.

Effects of Measuring Positions on the Measured Aerodynamic Performance of a Centrifugal Compressor

This paper performs a numerical simulation of three-dimensional flow field in a centrifugal compressor with long inlet and outlet pipes using CFX software.By arranging virtual probes at different positions in both inlet and outlet planes,the aerodynamic performance of the centrifugal compressor is measured and compared with each other.Then effects of measuring positions on measurement results are discussed.The results show that it will generate notable measuring errors of the pressure ratio and efficiency if the inlet total pressure is measured using a single-point probe.The inlet total pressure data can be accurate when they are measured using a 3-point rake.The outlet total pressure and total temperature data can not be accurate if they are respectively measured at one circumferential position even using a multi-point rake.Increasing tangential measuring positions at the outlet is effective to improve the test accuracy.When the outlet total pressure and total temperature are respectively measured at 3 tangential positions,the data can be almost accurate.

Holographic Duals of Quark Gluon Plasmas with Unquenched Flavors

We review the construction of gravitational solutions holographically dual to N=1 quiver gauge theories with dynamical flavor multiplets.We focus on the D3-D7 construction and consider the finite temperature,finite quark chemical potential case where there is a charged black hole in the dual solution.Discussed physical outputs of the model include its thermodynamics (with susceptibilities) and general hydrodynamic properties.