离子色谱仪在优选液体示踪剂及监测返排情况中的应用

川西致密气藏水平井分段改造中,可采用示踪剂分析各段压裂液返排情况进行压裂设计优化。市面上常规液体示踪剂一般采用色谱-质谱联用仪做测试分析,设备投入高达几百万,且检测周期长。本文利用离子色谱仪检测灵敏度高、分离效率高、分析速度快等优点[1],通过检测压裂返排液中的阳离子、无机阴离子及有机酸根离子浓度,开展背景检测、示踪剂间的干扰试验、静态吸附试验,分析地层水、降阻水与示踪剂的配伍性[2],研选出示踪效果显著、抗干扰抗吸附、配伍性良好的6种示踪剂产品。现场应用6口井,准确分析出示踪剂应用井段的返排和邻井压窜情况,为压裂设计优化提供了技术支撑。

新研常用中成药名方选讲课程教学方法探讨

《新研常用中成药名方选讲》是一门重要的中医学专业基础课,在教学过程中,应注意培养学生自主分析、运用中成药的能力,突出中成药合理使用、配伍原理、启发科研意识等。通过灵活运用研究-讨论为主的创新教学方法,有助于学生掌握好中成药的基本理论及提高临床运用能力,为学生走上临床、参与科研奠定扎实基础。

The Mechanism of Realizing the Value of Ecological Products and Case Studies

The article uses a case study approach to investigate the mechanisms of ecological product value realization,and influencing factors.Specifically,we use a case analysis framework based on the“economy-societynatural ecology”perspective to analyze and compare the three batches of“Typical Cases of Ecological ProductValue Realization”released by the Ministry of Natural Resources.We find:First,different modes of ecologicalproduct value realization exist.Different resource endowments,and institutional and environmental factors affectthe selection of the value realization modes.Second,certain obstacles also exist for realizing ecological productvalue,which are mainly reflected in the fact that the articulation of the individual,society,and government is not yetsufficiently close.Third,to promote the development of regional eco-products’mode and value conversion,the implementing party needs to guide the synergy between individual concepts,social participation,and governmentaltop-level design;rationally arrange the allocation of resource elements;mitigate elemental constraints;and proposeeffective technical means and optimization strategies according to the actual situation.

顾广圻与《文选》学研究

本文论述了清代著名校勘学家顾广圻与《文选》学研究的关系。顾氏校勘的李善注《文选》,为《选》学研究作出了重要的贡献,具有划时代的意义,至今仍是我们学习和研究《文选》的重要版本。

Isolation,Screening and Identification of High-temperature Cellulolytic Microbes in Pig Manure

[Objective] The research aimed to lay the foundation for high-efficiency biological degradation microbial inoculums. [Method] under the 60℃ temperature the cellulolytic microbes in pig manure were isolated and determined the CMCase and Fpase,then proceeded the 16S rRNA gene analysis. [Result]The results showed that:BC1 and BC3 strains characterized higher carboxymethyl cellulose enzyme activity and higher filter paper activity,but their difference was small,then the 16S rDNA sequence of BC1 and BC3 strains were related to pseudomonas sp. (98% and 99% similarities,respectively).[Conclusion] the experiment laid foundation for high-efficiency biological heating agent.

Quantitative Study on Polymer Flocculation Mechanism Based on Mathematical Morphology

Until now, understanding of polymer flocculation has remained restricted within the qualitative explanations of the bridge unite theory and the electricity neutralization theory, because people not only lacked the systemic knowl- edge of the polymer flocculation mechanism, the flocculation dynamic process study and the flocculation effect esti- mate, but also could not penetrate within the flocculation process microscopic field to obtain the structural character parameters such as floccule structure, the frame bridge models and so on. In this paper, not only coal slurry flocculation images were photographed by using the transmission electron microscope, but also the basic theory of the mathematical morphology was applied to the coal slurry flocculation image processing. The steps and methods of the mathematical morphology were expounded in detail. The micro-structural parameters such as the flocculate size and the bridge length were obtained, which combined the microscopic flocculation grain configuration observations with the macroscopic flocculation effect, so as to get the maximum amount of veracious information to describe and explain the whole floc- culation course by rule and line. On this basis, not only the flocculation models of polymers in the coal slurry are sug- gested, but the quantitative study on flocculation mechanism has been achieved.

New progress in the processing and efficient utilization of coal

Coal accounts for about 70% of the primary energy sources in China. The environmental pollution and resources waste involved with coal processing and utilization are serious. It is therefore urgent to develop highly-efficient coal resources utilization theory and methods with low-carbon discharge. Based on our long-term basic research and technology development, the progress in beneficiation, cleaning, and trans- formation of coal, which includes dense phase fluidized bed dry beneficiation, deep screening of wet fine coal, micro-bubble flotation column separation, molecular coal chemistry, and transformation and sepa- ration of coal and its derivatives into value-added chemicals under mild conditions, is discussed.

An Institutional Innovation for Agricultural Technology Adaptation and Adoption： Rice in West and Central Africa

This paper traces the origins and achievements of the R^seau Ouest et Centre Africain du Riz--ROCARIZ （West and Central Africa Rice Research and Development Network）. The ROCARIZ institutional arrangement showed that rice science is approached from multi-stakeholder perspectives that place end users and entrepreneurs at the center of research for development, and collaboration among rice-based stakeholders can be enhanced and sustained. The ROCARIZ used competitive research grants through multi-stakeholder task forces to generate, adapt, and facilitate the adoption of rice-based technologies and approaches by resource poor households. The grants contributed to： （1） farmer adoption of high yielding and multiple stress resilient lowland NERICAs （New Rices for Africa） （NERICA-L）; （2） producer access to credit and services resulting in increased marketing of quality seed rice, paddy, and grain rice by farmer entrepreneurs and poor rural households; （3） improved skills of stakeholders on the use of impact assessment tools to demonstrate adoption of rice-based technologies; （4） enhanced skills of rice breeders in molecular assisted marker selection to shorten the varietal development process; and （S） experiential learning and sharing to improve access to information and knowledge.

The Status Quo of Topics Choosing in English Majors＇ Academic Writings—— A Case Study of CUPL Junior English Majors

Academic writings, whether they are BA dissertations or semester papers, are important carriers of one＇s ideas and findings of their own study and research spheres. In academic papers, the most important part is the choice of topics which determines the macro direction of the paper. Important as it is, it is difficult for the English majors to choose the most appropriate topics with idea-invested thesis statements instead of some factual statements. Therefore, in order to make clear of the status quo and underlying obstacles of topic choosing, this paper is to study on 98 samples from China University of Political Science and Law＇s junior English majors. By observing and analyzing their writings, the paper intends to fred out some possible and accessible methods to improve English majors＇ academic writing and offer some insights for teachers to make some adjustments in accordance with the status quo.

Construction and Application of Plasmid pUC19-CM-D

[Objective] The aims were to construct a new suicide plasmid of Lactobacillus and gene deletion engineering bacteria of Lactobacillus with pUC19 vector. [Methods] pUC19-CM was constructed by inserting a chloramphenicol resistant gene into the multi-cloning site of pUC19,and then two homologous fragments were cloned into each side of the pUC19-CM to construct suicide plasmid pUC19-CM-D. [Results] A replacement mutant strain,whose target gene was replaced by resistant gene,could be obtained by transforming the suicide plasmid pUC19-CM-D into Lactobacillus for resistance screening. [Conclusion] The construction and application of pUC19-CM-D provided a fast and efficient means of construction of gene deletion engineering bacteria of Lactobacillus,and laid a foundation for study of gene function of Lactobacillus.

Analogy-based software effort estimation using multi-objective feature selection

The feature selection in analogy-based software effort estimation （ASEE） is formulized as a multi-objective optimization problem. One objective is designed to maximize the effort estimation accuracy and the other objective is designed to minimize the number of selected features. Based on these two potential conflict objectives, a novel wrapper- based feature selection method, multi-objective feature selection for analogy-based software effort estimation （MASE）, is proposed. In the empirical studies, 77 projects in Desharnais and 62 projects in Maxwell from the real world are selected as the evaluation objects and the proposed method MASE is compared with some baseline methods. Final results show that the proposed method can achieve better performance by selecting fewer features when considering MMRE （mean magnitude of relative error）, MdMRE （median magnitude of relative error）, PRED （ 0. 25 ）, and SA （ standardized accuracy） performance metrics.

Which Friction Factor Model Is the Best？ A Comparative Analysis of Model Selection Criteria

The ongoing research for model choice and selection has generated a plethora of approaches. With such a wealth of methods, it can be difficult for a researcher to know what model selection approach is the proper way to proceed to select the appropriate model for prediction. The authors present an evaluation of various model selection criteria from decision-theoretic perspective using experimental data to define and recommend a criterion to select the best model. In this analysis, six of the most common selection criteria, nineteen friction factor correlations, and eight sets of experimental data are employed. The results show that while the use of the traditional correlation coefficient, R2 is inappropriate, root mean square error, RMSE can be used to rank models, but does not give much insight on their accuracy. Other criteria such as correlation ratio, mean absolute error, and standard deviation are also evaluated. The AIC （Akaike Information Criterion） has shown its superiority to other selection criteria. The authors propose AIC as an alternative to use when fitting experimental data or evaluating existing correlations. Indeed, the AIC method is an information theory based, theoretically sound and stable. The paper presents a detailed discussion of the model selection criteria, their pros and cons, and how they can be utilized to allow proper comparison of different models for the best model to be inferred based on sound mathematical theory. In conclusion, model selection is an interesting problem and an innovative strategy to help alleviate similar challenges faced by the professionals in the oil and gas industry is introduced.

RESEARCH ON DENSITY STABILITY OF AIRDENSE MEDIUM FLUIDIZED BED

In this paper on the basis of studying the distribution of fine Coal in the dense medAn fluidised bed. the optimai size range of fine coal, which constitutes a fluidized bed together with the dense medium, has been found. In the separating process the fine coal will continuously aeeumulate in fluidized bed, thus inevitably reducing the density of the bed.In order to keep bed density stable, the authors adopted such measures as split-now of used medium and complement of fresb dense medium.The experiment results in both lab and pilot systems of the air-dense medium fluidized bed show that these measures are effective and satisfactory. Then authors also have estabinbed some relative dynamic mathematical models for it.

Working With News Literacy Among Pre-teens： From Selection to Reflection

This article presents the outcome of the Swedish pilot study CESEM （named after the initials of the girls＇ first names） where pre-teen girls produced their own news program and showed it to their classmates. The methodological approach was the action research model where the process of producing news was followed from selecting news to reflecting on their learning outcomes. The knowledge from the pilot study is useful in designing active projects within the scope of media literacy. One of the learning outcomes for the girls in this study was the awareness of how news programs in TV are staged. A positive response was the initiative from one of the participating schools to start their own news project in one of the classes. A possible outcome in longer run projects is better knowledge for developing pedagogical tools in media education.

INTRODUCTION OF THE HIGH THROUGHPUT SCREENING SYSTEM

In this article, we introduce the system of high throughput screening (HTS). Its role in new drug study and current development is described. The relationship between research achievements of genome study and new type screening model of new drugs is emphasized. The personal opinions of current problems about HTS study in China are raised.

Method for Selecting the Optimal Solution for the Design of the Gear Train

Some researchers in mechanical engineering have developed systems for the design of gear transmission boxes, but almost no calculation methods exist for widespread synthesis. In this article, we outline methods for automatic determination of toothed helical gear trains and the selection criteria for the optimal choice of gear trains. In this work two methods were applied. As first design to use an expert system for the design and then optimize the design that is why we used Kappa PC and Catia for CAD.

Multi-criteria decision-making selection model with application to chemical engineering management decisions

Chemical industry project management involves complex decision making situations that require discerning abilities and methods to make sound decisions. Chemical engineers as project managers are faced with decision environments and problems in chemical industry projects that are complex. Multiple-criteria decision making （MCDM） approaches are major parts of decision theory and analysis. This paper presents all of MCDM approaches for use in chemical engineering management decisions. In this work, case study is Research and Development （R＆D） project selection in chemical industry. The ability to make sound decisions is very important to success of R＆D projects. It is hoped that this work will provide a ready reference on MCDM and this will encourage the application of the MCDM in chemical engineering management.

The measurement of sexual selection on females and males

As in any field of research, the study of sexual selection is subject to ongoing debate over definitions and interpreta- tions of the fundamental concepts involved. These arguments generally promote progress, as they highlight areas where current explanations are incomplete. Here we briefly review two ongoing discussions in the sexual selection literature. First, the definition of sexual selection has received renewed interest in light of increasing research effort into when and how it operates in females. Second, how best to measure sexual selection is an ongoing subject of debate; in practice, recognition that the appropriate measures depend on the focus of the specific study, and that multiple measures should be employed wherever possible, seems to provide the most informative approach. The wide scope of recent empirical work in these and related areas, with the application of new techniques and approaches, reflects that the field of sexual selection is being constantly expanded and enriched

High-throughput screening technologies for ion channel drug discovery

Ion channels are attractive targets for drug discovery as an increasing number of new ion channel targets have been uncovered in diseases, such as pain, cardiovascular disease, and neurological disorders. Despite their relevance in diseases and the variety of physiological functions they are involved in, ion channels still remain underexploited as drug targets. This, to a large extent, is attributed to the absence of screening technologies that ensure both the quality and the throughput of data. However, an increasing number of assays and technologies have evolved rapidly in the past decades. In this review, we summarized the currently available high-throughput screening technologies in ion channel drug discovery.

Learner Choice and Accommodation:Exploring Comments in Chinese EFL Learning Diaries

本文区分顺化(accommodation)的认知、批判和交际三种意义。对这三种意义的探讨有助于理解二语/外语课堂的教与学,包括学习者遇到的困难、障碍和学习者做出的选择。研究的第一手资料是65位高校英语专业学生的275篇英语学习日记。通过对学生的话语进行内容分析(content analysis),我们探讨学生在特定学习环境下所做出的学习选择,从而建议应该对语言学习中的顺化现象进行更全面的描述。