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It is a comprehensive subject for Magnetic Resonance Imaging ( MRI) Technology whose theory is very difficult to be understood by the students. As for those reasons, such as high-cost, huge-size, curing parameters, and the low efficiency of teaching, using the real devices or small magnetic resonance teaching experiment instruments are unable to achieve the scientific, standardized and mass of teaching on the one hand. Meanwhile, it also reduces the difficulty of operation, limits the application potential of MRI and weakens the students cultivation of the ability to analyze and control the quality of the image on the other hand. In this paper, through teaching practice and thinking for a long time, the authors presented that it is the development trend of experimental teaching by combining virtual teaching software with small MRI simulation equipment. Small MRI simulation equipment is used for the structure teaching of MRI equipment, and virtual teaching software is used for the theory teaching. The software is able to simulate the whole process of MHI,and makes the students understand and master relevant principle of MRI through forward and reverse learning. On this basis, the “1 + N + 1 experimental teaching model of the virtuality and reality combination was presented and explained in this paper. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Magnetic resonance imaging ( MRI) technology is a comprehensive subject. Because its theory is very abstract, it is always the teaching difficulty. In order to overcome the problem, an integration of theory and practice teaching model based on the advanced teaching theory has been established after many years exploration and development. Fourteen experiments were developed depending on the actual demands. A small MRI experiment teaching apparatus and the corresponding experimental textbook were developed by the collaboration with the enterprise. Meanwhile, the virtual teaching software was developed independently to overcome the shortcomings of hardware, The software could not only simulate all experiments on the teaching apparatus but also provide the advance sequence simulations. Based on the learning theory of constructivism, the question exploring teaching model could help the students realize the active learning. It has achieved very good effect for this teaching model combining with the reasonable evaluation system. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Image & Graphics is the property of Editorial Office of Journal of Image & Graphics and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Selectivity estimation for spatial databases is a core scientific problem in query optimization. The exiting spatial histograms violate the integrity of spatial objects, so it is difficult to precisely calculate the selectivity of spatial data to deduce the histograms of query results. In view of the above problems, we propose a forward cumulative annular bucket histogram, referred to as the cumulative AB histogram. This histogram establishes annular buckets to receive all spatial area objects. Therefore, it maintains the integrity of area objects and achieves better performance on the selectivity estimation and histogram deduction in fine spatial topological query. We discuss some theories of the cumulative AB-histogram in detail and propose selectivity estimation methods for fine topological queries. We take land use data as example to show accuracy of selectivity estimation and discuss topics relevant to the efficiency and scope of applications. [ABSTRACT FROM AUTHOR]

Objective To establish a quality control standard for Qingre Baidu granules. Methods Isatidis Radix, Fructus Forsythiae, Herba Violae, and Glycyrrhizae were identified by TLC, and the concentration of chlorogenic acid was determined by HPLC. This method was employed on an Agilent ZORBAX SB-C18 column (4.6 mm×250 mm, 5 μm) at 30℃ with a mobile phase of acetonitrile (A) and 0.2% formic acid (B) using the gradient elution program shown as follows: 0-12 min, 11%-12% A run at the flow rate of 1.0 ml/min. The injection volume was 20 μl and the detection wavelength was 327 nm. Results Characteristic spots could be detected by TLC and the specificity of the method was satisfactory. As for chlorogenic acid, the equation of linear regression of chlorogenic acid was Y=60.239 4X+9.096 3 (r=0.999 9) with the linear range of 6.19-396.00 μg/ml. The average recovery was 99.66% (RSD=2.82%). Conclusion The established method is simple, reliable, reproducible, and can be used for the quantitative determination and quality control of Qingre Baidu granules. [ABSTRACT FROM AUTHOR]

OBJECTIVE:To improve the quality standard of Zhibaianshen oral lquid .METHODS: Anemarrhenae rhizoma and lilii bulbus were identified by TLC method , and the concentration of neomangiferin and mangiferin were determined by HPLC method.Separation was carried out on a Agilent Eclipse XDB-C18 (4.6 mm ×250 mm, 5μm) column with the mobile phase of acetonitrile and 0.2%formic acid in gradient elution at a flow rate of 1 ml/min.The detection wavelength was set at 246 nm, the column temperature was 30 °, and the injection volume was 20 μl.RESULTS:The characteristics of spots in TLC were quite clear with strong specificity .As for neomangiferin and mangiferin , the linear range of the calibration curve was 10.5-210.0 and 10.4-208.0 μg/ml, respectively (r2≥0.999 9), and the results of precision , accuracy and stability were satisfactory with RSD less than 2.00%.The average recovery rate turned out to be 103.49%( RSD=0.86%) and 98.81%( RSD=1.26%) ( n=6 ) .CONCLUSIONS: The established method is simple and reliable , which can be used for the quality control of Zhibaianshen oral liquid . [ABSTRACT FROM AUTHOR]

On the basis of the features and functions of specialized laboratories of the engineering majors in colleges and universities, the quantitative evaluation method of value and rate of the utility for the laboratories was established combining the analysis of the resources input and output of the laboratories. By adopting this method, the running state of the newly built laboratories was objectively evaluated. In the meantime, it could provide principal evidence for the resource schedule of the universities, preliminary judgment of the necessity of the new planned laboratory and supporting reference for resource allocation of the universities. Finally, the influence of the compound cycling method in experimental teaching on the utility rate of the laboratory resources was discussed. [ABSTRACT FROM AUTHOR]

Objective To investigate the effect of pioglitazone on serum adiponectin(ADP), urinary albumin creatinine ratio (UACR) and renal pathology of KKAy mice, and discuss the mechanism of pioglitazone preventing and treating diabetic nephropathy(DN). Methods Sixteen male KKAy mice (12 weeks old) were randomly divided into 2 groups according to blood glucose: diabetes mellitus group (D group) and pioglitazone treatment group (P group), which were fed with high lipid chow. Meanwhile, eight male C57BL/6 mice as the control group (C group) which were fed with ordinary chow for 12 weeks. Serum ADP, UACR were assayed in each group. Renal pathology was observed by light microscope and electron microscope. Wilms tumor 1, zonula occludens-1 (ZO-1), AMP activated protein kinase (AMPK) and NADPH oxidase-4 (NOX-4) were positioned and evaluated by immunohistochemistry in each group. The data of three groups were analyzed by single factor analysis of variance, and the data of two groups were compared with independent samples t test. Results The level of UACR in P group ((75 ± 9)μg/mg) was lower than that before therapy ((121±19)μg/mg) and that in D group((159±20)μg/mg, t=3.864, 4.975, both P<0.01). The serum ADP in P group ((67 ± 6)μg/ml) was higher than that in D group((39 ± 14)μg/ml, t=4.087, P<0.01). Renal pathology was significantly alleviated. The podocyte number, ZO-1 and AMPK in P group were higher than that of D group(t=2.036, 2.585, 2.947, all P<0.05). NOX-4 in P group was lower than that of D group(t=3.612, P<0.01). Conclusions One of the possible mechanism of pioglitazone preventing and treating DN may be to increase the level of ADP, up-regulate AMPK, inhibit NOX-4, relieve oxidative stress and repair injured podocyte. [ABSTRACT FROM AUTHOR]

Copyright of Chinese Journal of Clinical Healthcare is the property of Chinese Journal of Clinical Healthcare and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of International Obstetrics & Gynecology is the property of TianJin Medical Information Center and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Progress in Modern Biomedicine is the property of Publishing House of Progress in Modern Biomedicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

We report a systematic study of the In-assisted deoxidation (IAD) of epitaxial GaAs(100) substrates. Optimized IAD conditions resulting in a pit-free and smooth GaAs surface are found. Photoluminescence lines from single quantum dots (QDs) with linewidths in the range of 250–400 μeV are observed from low-density InAs QDs grown at a distance of 10 nm from a GaAs surface deoxidized under an optimized condition. Our study shows that IAD is very promising for application in the growth of nanostructures on patterned GaAs substrates. [ABSTRACT FROM AUTHOR]

We report a systematic study of the In-assisted deoxidation (IAD) of epitaxial GaAs(100) substrates. Optimized IAD conditions resulting in a pit-free and smooth GaAs surface are found. Photoluminescence lines from single quantum dots (QDs) with linewidths in the range of 250–400 μeV are observed from low-density InAs QDs grown at a distance of 10 nm from a GaAs surface deoxidized under an optimized condition. Our study shows that IAD is very promising for application in the growth of nanostructures on patterned GaAs substrates. [ABSTRACT FROM AUTHOR]