钮树玉《段氏〈说文注〉订》“订段改篆”考论

“订段改篆”是钮树玉《段氏〈说文注〉订》的主要订正内容之一,对段玉裁《说文解字注》有不可忽视的补充作用。因甲骨文、金文等古文字资料于近代才被挖掘出土,清代钮树玉、段玉裁等诸小学家均未识读甲骨文、金文等古文字,故其对《说文解字》的训释亦有不妥及疑惑之处。论文对钮树玉所订内容的“订段改篆”问题作考论,考察钮树玉所订段玉裁改篆的种种现象,最终归纳出段氏改篆的六种情形:因声符而改篆、因字形之讹而改篆、因字之异体而改篆、因字之正俗而改篆、因字形省略而改篆、因文献之误或无文献依据而臆断改篆。钮树玉的“订段改篆”亦存在因考证资料不足而出现的订正之误,因此值得深入研究。

DF4D型（半悬挂）机车转向架构架局部裂纹的原因分析及处理

DF4D型（半悬挂）机车2004年8月在转向架构架局部处发现裂纹，为此采用了有限元分析、动力学仿真计算、静强度及疲劳强度试验、线路动应力测试、现场应急处理等手段，介绍了裂纹产生的原因、试验结论。及时制定了机务段改造、中修、大修、新造等方案及处理措施，解决了这一危及行车安全的问题。

DF4D型（全悬挂）机车电机吊座开裂问题的原因分析及处理

DF4D型（全悬挂）机车在2005年初牵引电机后吊座发生开裂问题，为此采用了有限元分析和现场处理等手段，通过牵引电机后吊座发生开裂的原因分析，介绍了机务段改造、中修、大修等方案及处理措施，解决了这一危及行车安全的问题。

Diagnostic value of gadobenate dimeglumine-enhanced hepatocyte-phase magnetic resonance imaging in evaluating hepatic fibrosis and hepatitis

AIM To evaluate the diagnostic value of gadobenate dimeglumine(Gd-BOPTA)-enhanced hepatocyte-phase magnetic resonance imaging(MRI) in evaluating hepatic fibrosis and hepatitis.METHODS Hepatocyte-phase images of Gd-BOPTA-enhanced MRI were retrospectively evaluated in 76 patients with chronic liver disease. These patients were classified into five groups according to either the histopathological fibrosis stage(S0-S4) or the histopathological hepatitis grade(G0-G4). The relative enhancement ratio(RE) of the liver parenchyma in the T1-vibe sequence was calculated by measuring the signal intensity before(SI pre) and 90 min after(SI post) intravenous injection of Gd-BOPTA using the following formula: RE =(SI post-SI pre)/SI pre. One-way analysis of variance was used to compare the difference between the relative RE in the hepatocyte phase(REh) and the stage of hepatic fibrosis and the grade of hepatitis. Pearson's productmoment correlation analysis was used to evaluate the relationship between the REh and the levels of serologic liver functional parameters.RESULTS According to histopathological hepatic fibrosis stage, the 76 patients were classified into five groups: 16 in S0, 15 in S1, 21 in S2, 9 in S3, and 15 in S4 group. According to histopathological hepatitis grade, the 76 patients were also classified into five groups: 0 in G0, 44 in G1, 22 in G2, 8 in G3, and 2 in G3 group. With regard to the stage of hepatic fibrosis, REh showed significant differences between the S2 and S3 groups and between the S2 and S4 groups(P < 0.05), but no significant difference was observed between the other groups. With regard to the grade of hepatitis, REh showed significant differences between the G1 and G2 groups and between the G1 and G4 groups(P < 0.05), but no significant difference was observed between the other groups. Increased REh showed correlations with decreased serum levels of TB, ALT and AST(P < 0.05). CONCLUSION To some extent, measuring the REh using Gd-BOPTAenhanced MRI might be a noninvasive technique for assessing the stage of hepatic fibrosis. This method is able to differentiate no/mild hepatitis from advanced hepatitis. TB, ALT and AST levels can predict the degree of liver enhancement in the hepatocyte phase of Gd-BOPTA-enhanced MRI.

Image Restoration of Depth of Field Extension Imaging System Based on Genetic Algorithm

Genetic algorithm is a search algorithm based on genetic mechanism and natural selection. It has been widely applied to research fields including image processing field. The paper improves standard genetic algorithm and improves the arithmetic speed of the algorithm, which achieves better image restoration effect. And the paper compares the image restoration quality of traditional algorithm, standard genetic algorithm and improved genetic algorithm to prove the feasibility of applying genetic algorithm to image restoration.

The Study of English teaching mode based on information platform in higher vocational education

The development of modem information technology brings opportunities to vocational English teaching reform. Teachers use the advantages ＆modem information technology can create a good teaching situation, optimize the classroom teaching process, cultivate student＇ s self-learning ability, and improve the effectiveness of vocational English classroom teaching. The purpose of college English teaching is to enable students to master certain basic knowledge and skills in English, with some listening, speaking, reading, writing, translation ability, a simple verbal and written communication in daily activities and foreign business activities. Modem information technology provides a strong tecbaaical support to achieve this goal. Multimedia teaching methods widely used in teaching activities to vocational English class have brought a series of profound changes. Teachers using modem educational teclmology to fully develop learning resources, build new teaching model, which make vocational English classroom full of vigor and vitality.

A Task-driven Medical Teaching Design under the Guidance of B-learning

A new challenge has been brought by the rapid development of information technology to medical teaching, and the teaching reform of the medical education in China should be deepened for attaining a development. The core of deepening medical teaching reform is to break the traditional teaching model （i.e. giving a lecture）, and create a better classroom teaching situation by making full use of the modern teaching methods. In B-learning, the effective combination of the traditional teaching method＇ s advantages with the E-learning in a pure technical environment is advocated. In the task-driven teaching, a teaching design is made by students in a real or simulated real environment. In this paper, the effective combination of B-learning with the task-driven teaching model is introduced, so that the better teaching effect is achieved.

Intelligibility and Segmental Phoneme Repair Strategies in English-as-a-Lingua-Franca Interactions among Chinese and Japanese Speakers of English

This is a qualitative study of the types of segmental repair that maintain mutual intelligibility in English-as-a-Lingua-Franca interactions among Chinese and Japanese speakers of English （Jenkins, 2000; Matsumoto 2011; O＇Neal 2015a, 2015b, 2015c, 2015d, 2016, in press）. Repair refers to a set of practices through which conversation participants stop the ongoing action to attend to actual or potential problems 1：o the maintenance of mutual intelligibility （Schegloff, 2007; N^meth, 2012）. Although anything can potentially be a problem to the maintenance of mutual intelligibility, this study focuses only on instances of the repair of segmental phonemes so that the pronunciation remains mutually intelligible. Using conversation analytic methodology to examine a corpus of repair sequences concerning pronunciation among Chinese and Japanese students at a Japanese university, this study claims that three segmental repair strategies are used in the interactions to maintain mutually intelligible pronunciation： segmental phoneme modification, segmental phoneme insertion, and segmental phoneme deletion.

2D Pauli Equation with Hulthén Potential in the Presence of Aharonov-Bohm Effect

The 2D Pauli equation with Hulthen potential for spin-1/2 particle in the presence of Aharonov-Bohm （AB） field is solved analytically, on the assumption that an effective approximation is used for the centrifugal term. Singular and regular solutions of the problem are obtained. It is shown that the AB field lifts the degeneracy of the energy levels. The range of the flux parameter for which singular solutions are allowed is modified compared to the pure AB case. When the screening parameter vanishes, it is shown that the obtained energy spectrum becomes the same as that of the Aharonov-Bohm Coulomb problem.

Investigation of modification design of the fan stage in axial compressor

The S2 flow path design method of the transonic compressor is used to design the one stage fan in order to replace the original designed blade cascade which has two-stage transonic fan rotors.In the modification design,the camber line is parameterized by a quartic polynomial curve and the thickness distribution of the blade profile is controlled by the double-thrice polynomial.Therefore,the inlet flow has been pre-compressed and the location and intensity of the shock wave at supersonic area have been controlled in order to let the new blade profiles have better aerodynamic performance.The computational results show that the new single stage fan rotor increases the efficiency by two percent at the design condition and the total pressure ratio is slightly higher than that of the original design.At the same time,it also meets the mass flow rate and the geometrical size requirements for the modification design.