摘要：Oral English is always a difficult part for Chinese students,some can speak several sentences while not clearly know others’saying;others can understand the speakers’words while not express their own meaning *** paper will focus on what factors influences the college students’spoken English by the specific experiment and SPSS app,whose data shows four ones,namely Language Monitor,Meaning Negotiation,Turn Taking and Empathetic ***,the paper takes conclusions and poses some suggestions to oral English teaching according to the affecting *** is expecting to help improve the ability of the oral English Conversation for Chinese College students.

摘要：This paper analyzes and compares the performance of a new inverter topology with two types of input sources: 1) Solar PV source and 2) Ideal dc source (battery). The simulation is done in SIMULINK/MATLAB Software. It is shown that when the solar panel is connected, spikes are obtained in output voltage waveforms. These spikes are eliminated by inserting a capacitor. The capacitor is chosen for a particular power factor which is optimum with respect to cost, size and power quality. Total Harmonic Distortion, Active Power, Reactive Power, RMS Voltage and RMS Current are measured for different load power factor. Finally these results are compared with those obtained using battery with same input voltage magnitude. This Paper shows that for Solar Panel Circuit, THD, P and Q are less for 0.8 and above power factor, however below 0.8 PF, the THD, active and reactive power transfer are more. This means that the performance of Solar Panel in the proposed circuit topology is seen to be better as compared to the same circuit with battery within a range of power factor.

摘要：晶振监控法是一种实现非规整膜系监控的重要手段。在晶振监控中,晶振片与镀膜基片上沉积薄膜厚度的比值,即Tooling factor是相对固定的。采用晶振监控法实现薄膜厚度的精确控制必须对Tooling factor进行精确标定。本文提出了精确标定Tooling factor的方法,并对这种方法进行了实验验证。结果表明,该方法能够将膜厚控制误差从～20%降低到6%的水平,从而使多层膜的反射率曲线更加接近设计结果,实现多层膜膜厚的精确控制。

摘要：Seismic codes estimate the maximum displacements of building structures under the design-basis earthquakes by amplifying the elastic displacements under the reduced seismic design forces with a deflection amplification factor(DAF). The value of DAF is often estimated as ρ× R, where R is the force reduction factor and ρ is the inelastic displacement ratio that accounts for the inelastic action of the structure according to the definition presented by FEMA P695. The purpose of this study is to estimate the ρ-ratio of moment resisting steel frames(MRSFs) designed according to the Egyptian code. This is achieved by conducting a series of elastic and inelastic time-history analyses by two sets of earthquakes on four MRSFs designed according to the Egyptian code and having 2, 4, 8 and 12 stories. The earthquakes are scaled to produce maximum story drift ratios(MSDRs) of 1.0%, 1.5%, 2.0% and 2.5%. The mean values of the ρ-ratio are calculated based on the displacement responses of the investigated frames. The results obtained in this study indicate that the consideration of ρ for both the roof drift ratios(RDRs) and the MSDRs equal to 1.0 is a reasonable estimation for MRSFs designed according to the Egyptian code.

摘要：Bone tissue engineering (BTE) is a rapidly developing strategy for repairing critical-sized bone defects to address the unmet need for bone augmentation and skeletal repair. Effective therapies for bone regeneration primarily require the coordinated combination of innovative scaffolds, seed cells, and biological factors. However, current techniques in bone tissue engineering have not yet reached valid translation into clinical applications because of several limitations, such as weaker osteogenic differentiation, inadequate vascularization of scaffolds, and inefficient growth factor delivery. Therefore, further standardized protocols and innovative measures are required to overcome these shortcomings and facilitate the clinical application of these techniques to enhance bone regeneration. Given the deficiency of comprehensive studies in the development in BTE, our review systematically introduces the new types of biomimetic and bifunctional scaffolds. We describe the cell sources, biology of seed cells, growth factors, vascular development, and the interactions of relevant molecules. Furthermore, we discuss the challenges and perspectives that may propel the direction of future clinical delivery in bone regeneration.

摘要：Through analyzing relevant documents,connotations of rural landscape attractiveness were introduced,and existing problems of present rural landscapes *** was proposed that rural tourism of China has no effective strategic planning,distinctive characteristics of landscape products,or efficient marketing of rural landscape *** factors of rural landscape attractiveness were summarized,and suggestions were given to improve the attractiveness by combining with actual conditions of ***,it was stressed that favorable rural landscape images should be created,and more efforts devoted in safeguarding native-soil cultural landscapes and exploring tourist market of rural landscape *** study was to provide useful references for the new countryside construction of China.

摘要：The study,using an interlanguage corpus,investigates how international students in China acquire“prepositional phrase-verb”word *** found that students whose mother tongue features VO and OV word order mostly produce pre-placement structure of“prepositional phrase+verb”,which is similar to Chinese word order and hence reflects an overt influence of the target ***,when producing post-placement structure of“verb+prepositional phrase”,VO type L1 speaking students slightly outnumber those OV type L1 speaking students,which indicates limited influence of L1 *** addition,other factors such as the relator principle and the temporal iconicity principle also exert certain influence on the word order acquisition of“prepositional phrase-verb”structure.

摘要：High-quality seismic geometry is the key to obtain high-quality seismic data, and can affect the accuracy of data processing and imaging. Based on the analysis of the relationship between the quality of the geometry and the four acquisition parameters(the number of traces, shot line spacing, and the space and number of receiver lines), a quality evaluation method of the geometry based on comprehensive quality factor(CQF) is proposed, and the relationship between the geometry quality and the four parameters is given. We use field data collected in an oil field in Western China with complex geology: First we use a wide azimuth geometry. Then, we calculate the relationship curve between geometry and data quality by varying each parameter while keeping the rest fixed. and the analysis results are given by using the CQF evaluation method. The results show that the shot-line spacing has the greatest effect on the quality of the geometry, and the increase of the receiver line spacing can appropriately improve the quality of the geometry, and the increase of the number of receiving traces can improve the geometry quality. The different acquisition parameters have different effects on the imaging quality of shallow and deep events. The model forward and prestack depth migration are used to generate prestack depth migration profiles with different acquisition parameters. The imaging results are consistent with the above calculated results. According to the depth of the target layer, the quality factor evaluation method is applied to guide the design of the geometry and optimize the acquisition parameters to improve the imaging accuracy of seismic data.

摘要：目的：探讨Kr＆#252;ppel样因子2（KLF2）对氧化型低密度脂蛋白（oxidized low density lipo-protein， ox-LDL）诱导人脐静脉内皮细胞（HUVECs）微小RNA 146a（microRNA-146a， miR-146a）及细胞因子单核细胞趋化蛋白（MCP-1）和白细胞介素-6（IL-6）表达的影响。方法构建 KLF2过表达腺病毒载体（ rAAV-KLF2）及KLF2-siRNA，分别转染HUVECs及ox-LDL诱导的HUVECs。于0 h、3 h、6 h、12 h、24 h、48 h收集HUVECs，采用实时荧光定量PCR，检测HUVECs miR-146a的表达；设计合成锁核酸（the locked nucleic acid，LNA））修饰的anti-miR-146a的反义核苷酸（LNA-anti-miR-146a）转染HUVECs。收集各组细胞上清，采用双抗体夹心ABC-ELISA方法检测MCP-1及IL-6的表达。结果KLF2明显抑制静息及ox-LDL诱导的HUVECs miR-146a的表达，并显著减少ox-LDL诱导HUVECs MCP-1、IL-6的表达，且具有时间依赖性；miR-146 a 沉默可削弱ox-LDL诱导的内皮细胞炎症反应，而且部分逆转了KLF2对内皮细胞炎症反应的抑制作用。结论 KLF2通过下调miR-146 a的表达抑制ox-LDL活化的HUVECs MCP-1、IL-6的分泌。

摘要：In this paper the Delaware Method published in 1963 is analyzed and upgraded with using correction factors which take into account the undesirable currents of the mean flow. However, this method presents graphically these correction factors which imply an impediment to fulfill the software calculations. Thus, the equations corresponding to the correction factor equations and a Fortran 77 numerical program were established. This system is given to explore different design alternatives in order to find the optimal solution to each proposed problem. The results of this work was a simple software that can perform calculations with the introduction of parameters depending only on the geometry of the heat exchanger, i.e., geometry, temperature and fluid characteristics eliminating the human errors and increasing the calculations speed and accuracy.