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Search Results: 1 - 10 of 7869 matches for " Dai Meibin "
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Heavy metal pollution in soils and characteristics of heavy metal accumulation of dominant plants in antimony mining area

Ku Wenzhen,Zhao Yunlin,Lei Cunxi,Dong Meng,Dai Meibin,Yi Hecheng,

环境工程学报 , 2012,
Abstract: 通过野外调查采样,分析了冷水江锑矿区4个采样点土壤和优势植物中重金属含量,以及矿区生长的5种优势植物对Sb、As、Cd、Pb、Cu和Zn的的吸收与富集能力及其富集特性。结果表明,矿区土壤中6种重金属元素的平均含量均超出湖南省土壤背景值和全国土壤背景值,土壤受Sb污染最严重,其次是Cd、As的污染。5种优势植物淡竹叶、苎麻、芒草、狗尾草和白背叶体内Sb、As的含量都超过正常范围,具有修复矿区土壤Sb、As污染的潜力。其中苎麻对Sb的富集系数和转运系数均大于1,满足Sb超富集植物的基本特征,可作为生态恢复的先锋植物;芒草对Cd的富集系数和转运系数都大于1,对重金属有较强的耐性,作为重金属污染的修复植物具有较好的应用前景。
Growth responses and phytoremediation potential of Artemisia selengensis to Cd stress
蒌蒿(Artemisia selengensis)对土壤中镉的胁迫反应及修复潜力研究

DONG Meng,ZHAO Yunlin,LEI Cunxi,DAI Meibin,YI Hecheng,KU Wenzhen,

环境科学学报 , 2012,
Abstract: Artemisia selengensis grown in Dongting Lake wetland was recently found as a plant with good capacity in enriching Cd. A pot experiment was conducted to study the biological traits and the Cd accumulation characteristics of Artemisia selengensis to Cd stress during its growth period. The final results showed that the leaves were injured apparently in response to significant decrease of above-ground biomass when Cd concentrations in soil were higher than 40 mg·kg-1. Artemisia selengensis could complete its life cycle at a high Cd concentration (100 mg·kg-1) and showed strong resistence to soil Cd. The bioavailable Cd accounted for 15.3%~37.1% of total soil Cd. There were no significant differences of Cd concentrations in the plants during their different growth phases, but a lower Cd accumulation was observed in stems and leaves at the seedling stage than the other stages because of low biomass. During the adult stage of Artemisia selengensis, Cd accumulation was up to 492~588 mg·kg-1 under the Cd treatment of 40~60 mg·kg-1. These data suggested that Artemisia selengensis was an outstanding species that could be selected as a potential candidate to repair Cd pollution from lake soil.
3D Seismic Acquisition Technology and Effect in HX Volcanic Area in Liaohe Depression  [PDF]
Haibo Wang, Bing Liu, Qiwei Zou, Lizhi Sun, Wei Zhang, Jiantao Tian, Meibin Tang
International Journal of Geosciences (IJG) , 2016, DOI: 10.4236/ijg.2016.77071
Abstract: Multi-stages volcanic are available in HX area, shielding the seismic waves. Previous seismic acquisitions of large size bin, less fold coverage and narrow azimuth result in indistinct fault images, low S/N ratio and the difficulty of multi-stages volcanic characterization. In reference to the successful experience of domestic and overseas volcanic exploration, the low frequency excitation and receiving, and survey with wide range, high coverage, wide azimuth should be paid more attention, associated with two-dimensional and three-dimensional wave equation forward modeling and real data processing contrast analysis method. The image of underlying strata and fault are remarkably improved in the new method, according to the processing results of new seismic data. The new method will provide technical reference for the similar volcanic development area in the future seismic acquisition design.
Optimization on the High Precision 3D Seismic Acquisition Parameters in Leijia Tight Sandstone Oil Area  [PDF]
Haibo Wang, Wei Zhang, Bing Liu, Qiwei Zou, Guanhua Xiao, Meibin Tang, Hong Zhu, Wenjing Li
International Journal of Geosciences (IJG) , 2017, DOI: 10.4236/ijg.2017.81003
Abstract: The main targets of seismic exploration research in Leijia carbonatite tight sandstone oil area of Liaohe depression are thin reservoirs prediction and minor faults identification, which is one of the important representatives of complex exploration objects in Liaohe depression. High precision 3D seismic exploration has significantly improved the ability of thin reservoirs prediction and minor faults identification of this area. Reducing the cost of high precision 3D seismic exploration through optimizing the acquisition parameters is very important for the next step exploration and development of Liaohe depression and similar areas. Based on high precision 3D seismic acquisition data in Leijia tight sandstone oil area, multiple sub-geometries are obtained with different bin sizes, different folds, different aspect ratio, different line intervals by extracting receiver points and shot points, and PSTM processing is performed respectively, obtained PSTM datasets of the sub-geometries, extract time slices, amplitude slices along the layer, coherent slices and so on. We evaluate the data results of the sub-geometries from the aspects of signal-to-noise ratio, thin reservoirs resolution, acquisition footprint and so on. Considering the exploration cost and data effect of each sub-geometry, the optimal direction of the main parameters of high precision seismic exploration in Liaohe depression is put forward, and the acquisition effect of adjacent area by the optimized parameters is given.
"universe collapse model" and its roles in the unification of four fundamental forces and the origin and the evolution of the universe  [PDF]
Jiapei Dai
Natural Science (NS) , 2012, DOI: 10.4236/ns.2012.44030
Abstract: To unify the four known fundamental forces and provide an explanation for the origin and the evolution of the universe are two long-term goals of theoretical physics. Here a “universe collapse model” has been proposed. The universe consists of Matter and No-matter. No-matter is the universal energy that constructs a consistent universe field, presenting a spiral wave motion at the speed of light at the small scale. The partial collapse of the universal energy forms the particles of the universal energy in a variety of sizes, which are called as the elementary particles. These elementary particles form atom and matter, which construct the galaxies. The collapse of the universe field induces the formation of the universe collapse potential (UCP) and universe collapse force (UCF), and the later is represented by four different aspects of the fundamental forces at the large or small scales. The mathematical equation and the derivation of UCP and UCF are described, and possible experimental tests are also suggested. Therefore, this new model may give a novel explanation for the unification of four fundamental forces and the origin and the evolution of the universe.
Research on Influencing Factors of Executive Compensation in China’s Monopoly Industries  [PDF]
Yun Dai
Open Journal of Business and Management (OJBM) , 2014, DOI: 10.4236/ojbm.2014.23026
Abstract: The annual salary income of the executives in the state-owned monopoly industry has become the focus of the society recently. With the improvement of enterprise efficiency, executives deserve to get high pay. However, it’s should be noted that because of the state-owned monopolies’ special status, business performance relies heavily on administrative monopoly power, but not actually the efforts of leaders. In this case, the income distribution mechanism is distortion, which has caused great dissatisfaction. This paper aims to study the main affecting factors of the executive compensation of state monopolies, with 1280 firm-year observations of 183 monopoly companies. We find that 1) Executive compensation is positively correlated to firm performance, firm size, CEO duality; 2) Executive compensation is negatively correlated to state share proportion and independent director proportion; 3) Company location, industry both have significant influence on executive compensation.
Macroscopic anisotropic Brownian motion is related to the directional movement of a “Universe field”  [PDF]
Jiapei Dai
Natural Science (NS) , 2014, DOI: 10.4236/ns.2014.62009

Brownian motion was discovered by the botanist Robert Brown in 1827, and the theoretical model of Brownian motion has real-world applications in fields such as mathematics, economics, physics and biology. It is the presumably random motion of particles suspended in a liquid or a gas that results from their bombardment by fast-moving atoms or molecules, but the exact mechanism of Brownian motion still remains one of the unresolved mysteries in physics. Here circadian and seasonal changes in long-term macroscopic anisotropic (asymmetric) Brownian motion of a toluidine blue colloid solution in water in two dimensions were identified, suggesting that such an anisotropic Brownian motion may be related to an effect of the directional movement of “Universe field”, and thereby providing new interpretations and potential applications of Brownian motion.

The Conceptual Model of Influencing Factors and Influencing Mechanism on Team Decision-Making Quality Mediated by Information Sharing  [PDF]
Peihua Dai
iBusiness (IB) , 2013, DOI: 10.4236/ib.2013.54015

Searching for the influencing factors on team decision-making quality is the hot issue in academic circles and business circles. Based on summarizing the main influencing factors on team decision-making quality, this thesis divides the main influencing factors into team composition factors and team process factors and researches the internal relationship between them. Targeted at the field decision making, this thesis analyzes the influencing process of the main factors on decision-making quality, and constructs the conceptual model of “influencing factors-information sharing-decision-making quality”. This model not only combines the main influencing factors correctly, but also exposes the “black box” between the influencing factors and decision-making quality in field decision making, which can make up for no relative research for the field decision making in the previous studies.

The Application Research on DOI in the Digital Publication of Chinese Sci-Tech Journals  [PDF]
Ting Dai
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.37034
Abstract: DOI, Digital Object Identifier, has been pervasively applied in digital information resources overseas and becomes an international standard, while in China it’s still on the initial stage. This article discusses the application of DOI in the digital publication of Chinese sci-tech journals, and analyzes the problems, such as inadequate attention, lack of engagement, unsatisfactory application and so on, as well as the countermeasures. Giving the lifting effects of DOI on the digitalizing and networking of Chinese sci-tech journals, journal articles should be registered on DOI for the display degree and citation rate.
An Experimental Research on the Equalization of Basic Public Services in Huizhou City  [PDF]
Jiali Dai
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.44024
Abstract: In April 2012, the government of Guangdong Province selected Huizhou City as the first pilot city of this province to further promote comprehensive reform on the equalization of basic public services. Under the policy background, this paper selects pilot city, namely Huizhou, as an experimental research object, and selects three core indicators of the foundational education, social insurances and medical and health services to analyze. Specifically, this paper introduces governmental policies and security standards, and uses statistical analysis and coefficient of variation method to calculate and compare the index data for each county (district) of Huizhou City from 2008 to 2014. Overall, by studying current situation of the equalization of basic public services, we know the government of Huizhou has innovatively established a series of policies and measures and made considerable achievements in the process of implementation. Many coefficients of variation of indicators have declined after pilot project. But among the basic public services, the medical and health service develops slowly and it is serious unequal. The construction of medical and health service has become the bottleneck of the equalization of basic public services. Finally, according to the medical problem, the corresponding countermeasures are put forward.
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