《斑纹》主旨和文体新探

《斑纹》的主旨是:自然界的有形的无形的万物,以斑纹的形式,按照自然的规律、自然的秩序存在,不管是美还是丑、善还是恶、强还是弱、爱还是恨,抑或是生还是死,这种存在本身就是有价值的、有意义的,就是美的。《斑纹》的重点不是介绍斑纹的特点和斑纹的作用,也不是以说明为主要表达方式,而是在于通过斑纹来抒发作者对自然的思考和感悟,所以,它是一篇散文,而非教材所说的“文艺性说明文”。

微视频在高中语文教学中的应用——以《斑纹》的教学为例

随着网络信息技术的发展及教学改革的不断推进,现代教育越来越重视利用信息技术优化以往的教学方式。本文借用《斑纹》这一篇课文对两个高二班级教学进行对比与思考,认为将微视频这一现代教育技术引入高中语文教学有利于提高课堂教学效率、聚焦教学重点、促进知识内化。同时也提出一些疑问,探求以微视频为载体促进语文知识内化的有效方法。

试论散文语言特点形成的主要因素——以《斑纹》《听听那冷雨》为例

不同作家的散文,甚至同一作家的不同散文,语言会呈现出不同的风格特点,这主要是由散文的文体特征、作家的个性和写作题材决定的。以《斑纹》和《听听那冷雨》为例,多角度总结散文语言风格的形成机制。

基于培育核心素养的高中语文支架式教学研究——以《斑纹》教学为例

培育学生的语言运用能力、提升学生的思维品质、增强学生的审美情趣、强化学生文化传承的使命,是高中语文学科核心素养的应有之义。以培育语文学科核心素养为目标的高中语文教学实践,需要借助于一定的"脚手架",从而使学生的学习活动与核心素养的培育产生有意义的联系。支架式教学是一种为学习者提供概念框架,进而促进学生深度学习的教学方式。这种支架基于促进学习者对知识的深度理解和运用而建立起来。可见,支架式教学指向的是学生的深度学习.

A New Record Genus Polyamia DeLong,with Two New Species (Hemiptera:Cicadellidae:Deltocephalinae) from China

In the present paper, Polyamia DeLong is firstly recorded with two new species ——Polyamia penistenuis, sp. nov. and Polyamia drepananiforma, sp. nov. from China. The type specimens are deposited in the Entomological Museum of the Northwest Sci-Tech University of Agriculture and Forestry, Yangling, Shaanxi, China.

Determination of Barbaloin in Aloe vera L. var. chinensis (Haw.) Berger and Aloe barbadensis Miller by HPLC

A reserved-phase HPLC method was developed for the determination of barbaloin in Aloe vera L. var. chinensis (Haw.) Berger and Aloe barbadensis Miller, and whether there was a close relationship between the contents of barbaloin and their environments in which they were growing was decided. A Hypersil ODS column (4.6 mm×200 mm, 5 μm)was used with a mobile phase of methanol-water (40:60, containing 0.1% acetic acid), the flow rate being 1.0 mL·min -1, detection wavelength at 359 nm, and the column temperature being 30℃. The linear range of barbaloin was between 0.0726 and 0.726 μg with a correlation coefficient of 0.9998 and the regression equation being Y=1.9202×10 6X-1801.9. Barbaloin was stable in methanol in 48 h and the instrument precision was 1.2% while the method precision was 4.9%. The contents of barbaloin of 12 samples ranged from 6.160 to 319.1 μg·g -1. The method developed was fast and simple with good reproducibility. There was high correlation between the contents of barbaloin and their growing environments.

Microbial control of diamondback moth, Plutella xylostella L. （Lepidoptera： Yponomeutidae） using bacteria （Xenorhabdus nematophila） and its metabolites from the entomopathogenic nematode Steinernema carpocapsae

Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension. The application of aqueous suspensions of cells of X.nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests on foliage.

Development of Sustainable Solutions for Zebra Mussel Control Through Chemical Product Engineering

The zebra mussel is an important aquatic pest that causes great damage to freshwater-dependent industries, due to biofouling. The main goal of the project discussed here is to develop improved solutions to control this species. Three approaches have been explored in an attempt to design innovative application strategies for existing biocides： （i） encapsulation of toxins; （ii） combination of toxins; （iii） investigation of the seasonal variation of the species＇ tolerance to toxins. In this paper, the principles behind these approaches and the major results on each topic are presented. The benefits of adopting a chemical product engineering approach in conducting this project are also discussed.

Effect of preload force on heat generation of fatigue crack in ultrasonic infrared thermography

The heat generation behaviors of fatigue crack are deeply investigated under different preload forces combing numerical simulation and experiment.Firstly,a multi-contact simulation model is applied to stimulate the crack surfaces contact and the horn-sample contact under ultrasonic excitation for calculating the temperature fields.Then,the ultrasonic infrared thermography testing and the microscope testing are carried out for the heat generation and the plastic deformation behaviors of crack region under different preload forces.On this basis,an indirect observation method based on dots distribution is proposed to estimate the plastic deformation on crack contact surfaces.The obtained results show that the temperature rise of crack region increases with the increase of preload force when the preload force is less than 250 N,while the temperature rise rapidly declines due to the plastic deformation on crack contact surfaces and the inhibition effect when the preload force is 280 N.Moreover,the plastic deformation does not lead to the crack propagation,but reduces the detection repeatability of fatigue crack.This work provides an effective method for optimizing testing conditions in practical testing processes,which will be helpful to the establishment of testing standards for batches of test objects in ultrasonic infrared thermography testing.

Influence of welding parameters on fracture toughness and fatigue crack growth rate in friction stir welded nugget of 2024-T351 aluminum alloy joints

Friction stir welding （FSW） was performed on 2024-T351 aluminum alloy plates. Metallographic analysis, Vickers microhardness and XRD tests were conducted to determine the properties of the welded zone. FE simulation of the FSW process was implemented for the different welding conditions to extract the residual stress and stress intensity factor （SIF）. Fracture and fatigue behaviors of the welds which have the initial crack in the nugget zone and the crack orientation along the welding direction, were studied based on standard test methods. Fracture behavior of the welds was also evaluated by shearography method. The results showed that the tool rotational and traverse speeds affect the fracture toughness and fatigue crack growth rate. FSW provides 18%-49% reductions in maximum fracture load and fracture toughness. A slight diminution in fracture toughness of the joints was observed for lower traverse speed of the tool, and at higher traverse or rotational speeds, increasing the probability of defects may contribute to low fracture toughness. Fatigue crack propagation rate of all welds was slower than that of the base metal for low values of stress intensity factor range ΔK （ΔK〈13 MPa·m^1/2）, but is much faster for high values of ΔK.

Texture Analysis and Characteristic Identification About Plaque Tissues of IVUS

Intravascular ultrasound can provide clear real-time cross-sectional images,including lumen and plaque.In practice,to identify the plaques tissues in different pathological changes is very important.However,the grayscale differences of them are not so apparent.In this paper a new textural characteristic space vector was formed by the combination of Co-occurrence Matrix and fraction methods.The vector was projected to the new characteristic space after multiplied by a projective matrix which can best classify those plaques according to the Fisher linear discriminant.Then the classification was completed in the new vector space.Experimental results found that the veracity of this classification could reach up to 88%,which would be an accessorial tool for doctors to identify each plaque.

HPLC Fingerprinting and Spectrum-antitumor Effect Relationship for Discrimination between Mylabris phalerata Pallas and Mylabris cichorii Linnaeus

Objective： Evaluation of discrimination between two Mylabris Species based on HPLC fingerprinting andspectrum-antitumor effect relationship. Methods： In this study, a simple and efficient high-performance liquidchromatography （HPLC） method integrating with chemometric analysis and spectrum-antitumor effect relationship wasdeveloped for discrimination between two species of Mylabris： Mylabris phalerata Pallas （MP） and Mylabris cichoriiLinnaeus （MC）. Results： In the fingerprint analysis, 14 characteristic peaks were selected to assess the differencesbetween MP and MC using the similarity and pattern recognition analysis using PCA and OPLS-DA. The HPLCchromatograms of samples from 10 regions of China showed differences between MP and MC, and 7 characteristicchemical markers were found. In the spectrum-antitumor effect relationship analysis, 4 activity markers played a vitalrole in decreasing the IC50 and might be the antitumor components of Mylabris by grey relational analysis andmultivariate linear regression analysis. The chemometric analysis in combination with spectrum-effect relationshipresults indicated that peaks 2 （cytosine）, 4 （unknown） and 14 （unknown） were important differential markers fordistinguishing the two species of Mylabris. Conclusion： The method is applicable, credible and more efficient todiscriminate MP and MC, and will offer a new way for facilitating quality control of insect medicines.

Test particle simulation on the ion and electron zebra stripes and their time evolution in inner radiation belt

During February 15–16, 2014, the energetic electron spectrogram for four successive inner radiation belt crossing show clearly the electron zebra structures and their time evolution which last for about 17 h. Unfortunately, the time of flight(TOF) in RBSPICE measurement is turned off below 3 RE, and the ion measurement is contaminated by electrons. Thus in this study we studied the differences between the ion and electron zebra stripe structures and their time evolution using simple theory and test particle simulation, combining the electron measurement from RBSIPICE onboard Van Allen Probes. Theoretical analysis predicts that the ion zebra stripe structures should lie at a higher energy range than the corresponding electron zebra stripe structures due to that the directions of gradient B drift and corotation E×B drift are the same for electrons while opposite for ions. Test particle simulation with the dipole magnetic field and Volland-Stern electric field model have shown that the ion and electron zebra stripe structures could be produced by the convection electric field penetrating into the inner magnetosphere in this event, with their time evolution determined by total drift velocity that are different for ions and electrons. The predicted differences between the ion and electron zebra stripe structures are partially verified through observation. The ion zebra stripe structures could have potential influence to the ring current.