以民工学校为载体,提高农民工综合素质

随着因农民工综合素质低下带来的安全隐患和社会问题的日益突出,加强农民工安全培训、提高农民工综合素质已成为目前亟待解决的紧迫问题。创办民工学校不失为一条有效途径,笔者就民工学校创办提出了一些可行做法。

提高班主任的基本素质是搞好学生管理工作的关键

班主任工作是琐碎和麻烦的,要想搞好班主任工作,必须有对事业的强烈责任感和对学生的热爱之心。学校制定的班主任制度,仅仅是为搞好班级工作提供了一种形式上的保证,而班主任工作质量如何,归根到底还是看班主任是否愿意并自觉地承担起这一繁重的工作。在我国的各级各类学校中,班主任所必备的基本修养就是要忠诚教育事业,努力做到勤于耕耘、乐于奉献。

Variation in litter decomposition-temperature relationships between coniferous and broadleaf forests in Huangshan Mountain, China

A study was conducted to identify the differences in the decompositions of leaf litter, lignin and carbohydrate between coniferous forest and broadleaf forest at 20℃ and 30℃ in Huangshan Mountain, Anhui Province, China. Results showed that at 20℃ mass loss of leaf litter driven by microbial decomposers was higher in broadleaf forest than that in coniferous forest, whereas the difference in mass loss of leaf litter was not significant at 30℃. The temperature increase did not affect the mass loss of leaf litter for coniferous forest treatment, but significantly reduced the decomposition rate for broadleaf forest treatment. The functional decomposers of microorganism in broadleaf forest produced a higher lignin decomposition rate at 20℃, compared to that in coniferous forest, but the difference in lignin decomposition was not found between two forest types at 30℃. Improved temperature increased the lignin decomposition for both broadleaf and coniferous forest. Additionally, the functional group of microorganism from broadleaf forest showed marginally higher carbohydrate loss than that from coniferous forest at both temperatures. Temperature increase reduced the carbohydrate decomposition for broadleaf forest, while only a little reduce was found for coniferous forest. Remarkable differences occurred in responses between most enzymes （Phenoloxidase, peroxidase, !5-glucosidase and endocellulase） and decomposition rate of leaf litter to forest type and temperature, although there exist strong relationships between measured enzyme activities and decomposition rate in most cases. The reason is that more than one enzyme contribute to the mass loss of leaf litter and organic chemical components. In conclusion, at a community scale the coniferous and broadleaf forests differed in their temperature-decomposition relationships.

Study on Seedling Quality of Double-cropping Late Rice Sowed at Different Dates in Guangdong

[Objective] The aim was to study seedling quality of rice sowed at different dates so as to provide theoretical basis for determining the best seeding time.[Method] By investigating the characters of shoot and root of different varieties sowed at different dates,the best seeding time of double-cropping late rice was determined.[Result] The first leaf sheath height and the second leaf length shared significantly positive correlation,which fit the quadratic equation well.The effects of different sowing dates on shoot and root of three rice varieties appeared significant difference.[Conclusion] The best seeding time of Tianyou428 was in June 25-July 2 and that of Tianyou998 and Yuxiangyouzhan was in July 2-9.

Effect of Main Cultivation Factors on Quality Combination Parameters of High-quality Brassica napus Hybrids

[Objective] This study aimed to analyze the influence of five cultivation factors including sowing date, plant density, nitrogen fertilizer amount, phosphate fertilizer amount and potash fertilizer amount on the quality parameters of Brassica napus hybrid＆ [Method] Statistical analysis on the data from previous studies and our work was carried out [Result] The contents of erucic acid, thioglycoside, oil, oleic acid and linoleic acid were negatively correlated with the sowing date, while the contents of seed protein, palmitic acid, stearic acid and linolenic acid were positively correlated with the sowing date. The total amount of fat and protein, the ratio of unsaturated fatty acid （UFA） to saturated fatty acid （SFA）, the fatty acid （FA） of erucic acid chain, the total amount of oleic acid and linoleic acid were negatively correlated with the sowing date; the UFA content, the unsatu- ration index, the SFA content, the 18-C FA content, and the ratio of UFA to FA in erucic acid chain were positively correlated with the sowing date. The contents of erucic acid, thioglycoside, seed protein, oleic acid, linolenic acid and eicosenoic acid were negatively correlated with the plant density, while the contents of oil, palmitic acid, stearic acid and linoleic acid were positively correlated with the plant density. The total amount of fat and protein （F ＆ P）, and the ratio of UFA to FA in erucic acid chain were negatively correlated with the plant density, while the UFA content, the unsaturation index, the SFA content, the ratio of UFA to SFA, the 18-C FA content, the FA in erucic acid chain, and the total amount of oleic acid and linoleic acid were positively correlated with the plant density. The contents of erucic acid, thioglycoside, oil, protein in milled rapeseed, palmitic acid and eicosenoic acid were negatively correlated with the nitrogen fertilizer amount, while the contents of seed protein, oleic acid, stearic acid, linoleic acid and linolenic acid were posi- tively correlated with the nitrogen fertilizer amount; the total F ＆ P, the unsaturation index and the ratio of UFA to FA in erucic acid chain were positively correlated with the nitrogen fertilizer amount, while the UFA content, the SFA content, the FA in erucic acid chain, the total amount of oleic acid and linoleic acid, the ratio of UFA to SFA, and the 18-C FA content were negatively correlated with the nitrogen fertilizer amount The contents of erucic acid, thioglycoside, seed protein, linoleic acid and linolenic acid were negatively correlated with the potash fertilizer amount, while contents of oil, oleic acid, stearic acid and eicosenoic acid were positively correlated with the potash fertilizer amount; the total F ＆ P, the unsaturation index, the SFA, and the ratio of UFA to FA in erucic acid chain were negatively correlated with the potash fertilizer amount There were negative correlations between the contents of erucic acid, thioglycoside, seed protein, palmitic acid, stearic acid, linoleic acid, linolenic acid and phosphate fertilizer amount; positive correlations between the contents of oil, oleic acid, eicosenoic acid and phosphate fertilizer amount The total UFA, the unsaturation index, the 1843 FA, the SFA, the FA in erucic acid chain, and the ratio of UFA to FA in erucic acid chain were negatively correlated with the phosphate fertilizer amount [Conclusion] This study identified the correlations of the five cultivation factors with the quality parameters of high-quality Brassica napus hybrids, to provide theoretical basis for its cultivation.

Preliminary Isolation of Hormone Stimulating Muscle Protein Synthesis in Thoracic Ganglia from the Prawn, Macrobrachium rosenbergii

The results of the previous studies seem to show the crustaceans can secrete growth hormone,which regulate their growth.However,more evidences are needed to determine it.So the following research was conducted.The extract of thoracic ganglia (TGE) of adult Macrobrachium rosenbergii was applied to a Sephadex G-50 column,the resulting second peak was further isolated by HPLC,and 9 fractions were obtained.Among the fractions only the second fraction significantly increased the protein synthesis of the abdomen muscle of the juvenile M.rosenbergii that was injected TGE.The increasing effects were related to the protein concentration of the injecting fractions.The molecular weight of the substance in the second fraction isolated by HPLC was below 3.4?kDa.The results indicate that the thoracic ganglia of M.rosenbergii could secrete a peptide hormone,which stimulates the muscle protein synthesis of prawn,and the hormone might be the growth hormone of the prawn.

Challenges and Demands for College English Teachers Raised by Training All-round Qualified Persons

The latest issue of College English Curriculum Requirements has posed challenges and demands for teachers in terms of linguistic competence, academic knowledge, language skills, professional morality, emotional and attitudinal qualifications, etc., which requires teachers to embrace and handle with active and open-minded responses. Hence, teachers ought to strive to develop and improve their own overall qualifications in collaboration with the long-term development of the subject and of the national higher education, with the need of qualified persons demanded by social development and the students＇ learning. Teachers also ought to form a notion of scientific development by keeping pace with the time, so as to discern the trend of subject development, to form appropriate judgments concerning the social development and to properly regulate their own development.

Depolymerization of Organosolv Lignin over Silica-alumina Catalysts

Efficient conversion of lignin to fine chemicals and biofuel become more and more attractive in biorefinery. In this work, we used a series of silica-alumina catalysts （i.e., SiO2-Al2O3, HY, Hβ, and HZSM-5） to degrade lignin into arenes and phenols. The relationship between the catalyst structure and lignin depolymerization performance was investigated. The results showed that both acidity and pore size of the catalyst could influence the conversion of lignin. In the volatilizable product, phenols were identified as the main phenolic monomers via gas chromatography-mass spectrometer. SIO2-Al2O3 was the most efficient catalyst, giving 90.96% degree of conversion, 12.91% yield of phenols, and 2.41% yield of arenes in ethanol at 280℃ for 4 h. The Fourier transform infrared spectroscopy and ^1H nuclear magnetic resonance spectroscopy analysis demonstrated that deoxygenation and alkylation occurred in this process. The effect of solvents was also investigated and the results showed that ethanol was the most efficient solvent.

浅析拓展训练融入职业院校体育课堂

随着社会和经济的发展以及体育课课程的改革,体育课在教学中所扮演的角色越来越重要,传统的体育教学已经较难满足职业院校学生的需要。良好的心理素质、意志品质和团队合作意识对于即将走入工作岗位的职业院校学生尤为重要。拓展训练是一种以身体活动为引导,通过专门设计的活动场景,以＂陶冶情操、完善人格、磨练意志、熔炼团队＂为目的的一种学习方式。把拓展训练以一种全新的教学方式融入到职业体育教学中,提升学生动手能力、团队意识,使学生以最佳的身心状态走入社会尤为重要。

In vitro investigation of RGD-modified stabilized cationic liposomes as non-viral vehicle for siRNA delivery

In this study, the novel RGD-modified stabilized cationic liposomes were developed as the delivery vehicle for siRNA targeting human MDR1 gene. The complex of cationic liposomes and siRNA, RGD-Lipo-siRNA, was prepared with a narrow size distribution below 200 nm. It was shown that the encapsulated siRNA in the liposomes could be effectively protected from serum degradation. Also, enhanced cell binding and intracellular uptake of siRNA in the doxorubicin-resistant human ova- rian cancer cell lines SKOV3/A were found in RGD-Lipo-siRNA preparation as compared to that of unmodified cationic lipsomes （Lipo-siRNA）. Using the post-insertion method for RGD modification, lysosome release of siRNA in pRGD-Lipo-siRNA was improved. From flow cytometry, significant increase of doxorubicin accumulation was observed in the SKOV3/A cells treated with pRGD-Lipo-siRNA targeting human MDR1 gene. In vitro cytotoxicity assay showed that the significant cell growth inhibition was achieved in the SKOV3/A cells after treating with the combined use of siRNA and doxorubicin. In conclusions, postinserted RGD modified lipoplex, pRGD-Lipo-siRNA, was successfully used for siRNA transfection and achieved drug resistance reversal in human ovarian cancer SKOV3/A （doxorubicin-resistant） cells. It suggested that this liposomes might be a potential vehicle for siRNA delivery in vivo.

Formation and Characteristics of Acrylonitrile/Urea Inclusion Compound

The formation process and composition of the acrylonitrile/urea inclusion compounds （AN/UIC） with different aging times and AN/urea molar feed ratios are studied by differential scanning calorimetry （DSC） and X-ray diffraction （XRD）. It is suggested that DSC can determine the guest/host ratio and the heat of decomposition. Meanwhile, the guest/host ratio and heat of decomposition are obtained, which are 1.17 and 5361.53 J/mol, respec- tively. It is suggested AN molecules included in urea canal lattice may be packed flat against each other. It is found that the formation of AN/UIC depends on the aging time. XRD results reveal that once AN molecules enter urea lattice, AN/UIC are formed, which possess the final structure. When AN molecules are sufficient, the length of AN molecular arrays in urea canals increases as aging time prolonging until urea tunnels are saturated by AN.

Depolymerization and hydrodeoxygenation of lignin to aromatic hydrocarbons with a Ru catalyst on a variety of Nb-based supports

Efficient conversion of lignin to aromatic hydrocarbons via depolymerization and subsequent hydrodeoxygenation is important.Previously,we found that NbOx species played a key role in the activation and cleavage of C-O bonds in lignin and its model compounds.In this study,commercial niobic acid(HY-340),niobium phosphate(NbPO-CBMM)and lab-made layered niobium oxide(Nb2O5-Layer)were chosen as supports to study the effect of Brosted and Lewis acids on the activation of C-O bonds in lignin conversion.A variety of Ru-loaded,Nb-based catalysts with different Ru particle sizes were prepared and applied to the conversion of p-cresol.The results show that all the Ru/Nb-based catalysts produce high mole yields of C7-C9 hydrocarbons(82.3%-9.1%).What's more,Ru/Nb2O5-Layer affords the best mole yield of C7-C9 hydrocarbons and selectivity for C7-C9 aromatic hydrocarbons,of up to 99.1% and 88.0%,respectively.Moreover,it was found that Lewis acid sites play important roles in the depolymerization of enzymatic lignin into phenolic monomers and the cleavage of the C-O bond of phenols.Additionally,the electronic state and particle size of Ru are significant factors which influence the selectivity for aromatic hydrocarbons.A partial positive charge on the metallic Ru surface and a smaller Ru particle size are beneficial in improving the selectivity for aromatic hydrocarbons.

Light Fraction Carbon and Water-Stable Aggregates in Black Soils

The distribution of light fraction carbon （LF-C） in the various size classes of aggregates and its relationship to water- stable aggregates as well as the influence of cultivation on the organic components in virgin and cultivated black soils were studied by wet sieving and density separation methods. The total organic carbon （TOC） and LF-C were significantly higher （P≤ 0.05） in the virgin soils than in the cultivated soils. The LF-C in aggregates of different size classes varied from 0.9 to 2.5 g kg^-1 in the cultivated soils and from 2.5 to 7.1 g kg^-1 in the virgin soils, whereas the ratio of LF-C to TOC varied from 1.9% to 7.3% and from 5.0% to 12.2%, respectively. After being incubated under constant temperature and controlled humidity for three months, the contribution of LF-C to TOC sharply decreased to an amount （1.7%4.5%） close to the level in soils that had been cultivated for 20 to 25 years （1.3%-8.8%）. As a result, the larger water-stable macro-aggregates （especially 〉 1 mm） decreased sharply, indicating that the LF-C pool in virgin soils declined quickly after cultivation, which reduced the water stability of soil aggregates.

On the Importance of the American Black Fraternity and Its Enlightenment for the Fellow Townsmen Association in Chinese Universities

This paper first analyzes the benefits offered by the American Black Fraternities to the black college students in terms of improving academic achievement, cultivating leadership abilities, and enhancing social involvement on campus. Based on the successful experience of the American Black Fraternities, this paper further explores solutions to the serious problems existing in the Fellow Townsmen Association in Chinese universities to make it the same valuable asset for the development of the members＇ personality and comprehensive quality. The Association should be leveled up to an official student society to solve many of its managerial problems, and set a group goal to direct its members to the right track of serious study and completely transform the form and the content of its activities to improve the social skills of its members.

Allium sativum Flavor Compounds as an Indicator for Garlic Identity and Quality Determination

The objective of the study was to research the aroma profile of volatile compounds in garlic subspecies originating from Latvia, and compare them with the aroma composition of garlic grown in the region of Midi-Pyrenees （France）. It was established that hard-neck garlic tends to contain more diallyl disulfide （DADS）, the main decomposition product of allicin. Compared to the hard-neck subspecies, the content of allyl mercaptan, one of the major compounds producing the strong odor detectable after ingestion of garlic, was significantly lower in the soft-neck garlic clones. The amount of cyclic compound 3-vinyl-1,2-dithiin differed considerably with higher contents in the soft-neck subspecies. The results also demonstrate the soft-neck garlic as a more suitable subspecies for long-term storage. In general, the results show no significant difference in the content of DADS and the total content of other flavor compounds between hard-neck and soft-neck garlic grown in the region of Midi-Pyrenees and Latvia. However, comparing garlic subspecies originating from France and Latvia by the content of allyl mercaptan, 1,2-dithiolane and 3-vinyl-1,2-dithiin, a considerable proportional difference of these volatiles was determined. Also, a significant difference was established in the content of DADS between the white garlic variety ＂Blanc de Lomagne＂ （France, region of Midi-Pyrenees） and white garlic grown in other countries. The results of this study suggest the suitability of solid phase microextraction （SPME） and gas chromatography （GC） methods for quality control of garlic originating from France.

The analysis on the reform of college football course

Modem football has a long history and tradition, and it is one of the most popular sport around the world. The football also has a wide audience in China, and the development has formed a considerable scale in the colleges and universities in China, more and more students choose the football courses. However, the development of modem football in the football course in the colleges and tmiversities in China still exists many shackles. This paper regards the current football course in colleges and universities in China as the breakthrough point, simply analyzes the reform of college football course in the future, I hope it can gradually improve the football course and improve the quality of course on the basis of the clear characteristics to promote the development of comprehensive quality of students.

Explore of English reading strategies based on mental model pragmatic inference

With the continuous advance education reform and improvement of the quality of English teaching reform, it has become an important content to meet the needs of social development, and promote the comprehensive development of students＇ comprehensive quality and ability. In English teaching, learning English requires a lot of reading, and English reading effects and improve students＇ English scores are closely linked the relationship between the development of future good student. In this paper, the mental model of pragmatic reasoning and English reading give an overview of the psychological impact of the model, they were analyzed using the language to English reading brings reasoning, mental models proposed Pragmatic Inference in English reading, and it can effectively improve English reading efficiency, and promote English Reading level rise.

The Problems and Countermeasures about Preschool Art Curriculum

With the continuous reforms of education and development of kindergartens, preschool education is valued more, especially enhancing the standard of teachers＇ s artistic ability. Preschool education not only plays a crucial role in the development of children＇ s mind and body, but can promote the development of children＇ s IQ and learning potential, cultivating children＇ s overall qualities comprehensively.

On Practice and Exploration of College English Multimedia Network Teaching in China

With the development of the times, modem education technology constantly emerges, and modern college English classroom begins to tend to use multimedia network for teaching. One is that multimedia network teaching can enrich English teaching content. Two is that multimedia network teaching can make teaching process become full ofvigour, highlighting the dominant position of students in the classroom. Three, multimedia network teaching is conducive to improving the comprehensive quality of English teachers. In view of this, university English teaching should positively introduce multimedia network technology in teaching process, in order to promote English teaching quality to obtain great improvement.

Study of the Psychological Problems of College Students

Good psychological quality is an integral part of the overall quality of the contemporary college students, which is also an important foundation for their healthy growth and success. However, according to the investigation, in reality, many college students have various degrees of psychological problems, seriously affecting their normal learning and living. This article makes an in-depth discussion based on the analysis of contemporary college students＇ psychological quality system; in order to strengthen the mental health education and improve the students＇ adaptability.