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| 1 | Development and application of wellbore heat transfer model considering variable mass flow显示文摘Dual-gradient drilling technology is being increasingly used in formations with narrow pressure margins.For dual-gradient drilling based on downhole separation,hollow spheres are separated into the annulus at the separator position,resulting in variable mass flow in the wellbore.Thus,existing heat transfer models are no longer suitable for describing wellbore temperature profiles in dual-gradient drilling.This study focused on developing a wellbore heat transfer model that fully considers separated hollow spheres entering the annulus,complex casing programs,and heat sources,for dual-gradient drilling based on downhole separation.The model was solved using an iterative method.Then,the accuracy of the model was verified using temperature data measured from two wells.Finally,the difference in the annular temperature distributions between dual-gradient drilling and conventional single-gradient drilling were investigated,as were the wellbore heat transfer characteristics for dual-gradient drilling.The following major conclusions were drawn:(1)for dualgradient drilling based on downhole separation,at the separator location,the annular fluid temperature does not decrease,but rather increase in the flow direction because of the inflow of hollow spheres;(2)a clear inflection point exists in the annular fluid temperature curve at the location where the separator would be;(3)the magnitude of the mutation of the temperature curve at the inflection point is considerably affected by the heat capacities of the hollow spheres and the pure drilling fluid;(4)under the same change in separation efficiency,distance between the bit and separator,flow rate,and thermal conductivity of formation,the variation range of the fluid temperature at the bottom hole is greater than that at the wellhead. | Jiangshuai Wang Jun Li Gonghui Liu Shujie Liu Meipeng Ren Kuidong Luo Shanxun Tao | 2021 | Underground Space2021，6，3： | 3 |
| 2 | Adsorptive removal of arsenic from aqueous solution by zeolitic imidazolate framework-8 (ZIF-8) nanoparticles显示文摘 | Meipeng Jian Bao Liu Gaosheng Zhang Ruiping Liu Xiwang Zhang | 2014 | Colloids and Surfaces A: Physicochemical and Engineering Aspects2014，，： | 1 |
| 3 | Dried biomass of activated sludge for Cu2 + adsorption: behaviors and mechanisms 显示文摘 | JIAN Meipeng TANG Chaochun LIU Ming | 2014 | Journal of Dispersion Science and Technology2014，35，10： | 1 |
| 4 | Expression and immunoreactivity of an epitope of HCV in a foreign epitope presenting system显示文摘AIM: To construct and highly express an epitope of hepatitis C virus (HCV) in a foreign epitope presenting vectorbased on an insect virus, and to study the antigenicity of the epitope.METHODS: The HCV epitope sequence (amino acidresidues 315 to 328: EGHRMAWDMMMNWS) of the E1 region was constructed at different positions of a foreign epitope presenting vector based on an insect virus, flock house virus (FHV) capsid protein encoding gene as a vector, and expressed in E. coli cells. Western blottingand ELISA were used to detect the immunoreactivity of these recombinant proteins.RESULTS: The gene encoding of the concerned B-cell epitope of HCV E1 envelope protein was expressed on FHV capsid carrier protein at positions I1 (aa 106), I2 (aa153) and I3 (aa 305), respectively, on the surface of FHV capsid protein. The recombinant proteins in this system could be highly expressed in more than 40% of total cell protein of E. coli BL21. All the expressed recombinant proteins were in inclusion body form, and showed obvious immunoreactivity by Western blotting. Further purified recombinant proteins were detected by indirect ELISA as coating antigen respectively. All recombinant proteins could still show immunoreactivity.CONCLUSION: The epitope of HCV E1 envelope protein can be highly expressed in FHV carrier system as a chimeric protein with high immunoreactivity. This system has multiple entry sites conferring many possible conformations closer to the native one for a given sequence. | MeiPeng Chang-BaiDai Yuan-DingChen | 2005 | World Journal of Gastroenterology2005，11，22： | 1 |
| 5 | Protection of Ecological Environment in Territorial Spatial Planning显示文摘According to the fundamental foundation of China's economic and social development,it is necessary to consider the state of the land and resources.This has caused great concern about the sustainable development of land and resources.The economy has been developing steadily,bringing China into a new stage.At this stage,we should plan the land and resources more reasonably,so as to achieve the goal of ensuring economic development and long-term social stability.Therefore,the management of land and resources needs to be improved.Using scientific planning methods,the original technology is improved to reasonably protect and develop China's land and resources,thus contributing to the sustainable development of China and even the world. | Chen BAO Xiaoyun LI Meipeng LE | 2020 | Asian Agricultural Research2020，12，11： | 0 |
| 6 | Research Progress of Adansonia digitata显示文摘The origin,introduction,cultivation,active ingredients,use and advances in propagation methods of Adansonia digitata are reviewed in this paper,with focus on the rapid propagation techniques of plant tissues,to provide theoretical basis for seedling breeding and promotion of A.digitata. | Yang LIU Xiangtao ZHONG Guanming CHEN Guomin LIU Meipeng CHEN Hongyang LI | 2019 | Asian Agricultural Research2019，11，1： | 0 |
| 7 | The Formulation of Water System Planning of Jingdezhen Under Diversified Needs显示文摘The water system is the basic condition for urban development, and a key resource and environmental carrier in the process of urban formation. It has an important restrictive effect on the survival of the city. Based on the diversified needs of urban water system development, this paper explores the preparation of the urban water system planning of Jingdezhen, strengthens the protection of water system and environmental quality, and explores urban cultural connotation, in order to build a unique urban water environment. | LE Meipeng LI Xiaoyun | 2019 | Journal of Landscape Research2019，11，3： | 0 |
| 8 | The Strategy of Outdoor Space Micro-Renewal under the Goal of Communities for All Ages: A Case Study of Xingchaibeiyuan Community in Nanchang City显示文摘With the rapid development of the city,the old city has gradually lost its former glory,and the old community accounts for a large proportion in the city,and is located in the core area of the city. At present,there are some problems in the old community,such as high degree of aging,poor quality of living space,and lack of outdoor space. The old community transformation is mainly in the way of ' guided reconstruction',it has completely destroyed the original historical environment and the spirit of the place. Therefore,taking Xingchaibeiyuan Community in Nanchang City as an example,we deeply explore the strategy of micro-renewal of community outdoor space,so as to provide a reference for the renewal of outdoor space in this kind of old residential area. | Meipeng LE Yulian WU Yuting XIAO Taojian HE | 2019 | Asian Agricultural Research2019，11，5： | 0 |
| 9 | Reform of China’s Planning Concepts Under the Background of Urban Shrinkage显示文摘There are currently more than 100 cities in China experiencing urban shrinkage.Compared with shrinking cities in Western developed countries,this shrinking phenomenon has its own characteristics,which poses a challenge to the existing increment-and effi ciency-oriented urban planning system.China’s urban planning can learn from the Western concepts of“smart shrinkage”and“urban renewal”,and shift from the pursuit of“incremental supremacy”to cherishing“small and beautiful”,from focusing on economic effi ciency to promoting social justice,from following technological rationality to focusing on value rationality,from unitary goal guidance to multiple goal balance,and from single government decision to multiple public participation. | YANG Peiliang LI Xiaoyun LE Meipeng | 2020 | Journal of Landscape Research2020，12，6： | 0 |
| 10 | Resistance Torque Based Variable Duty-Cycle Control Method for a Stage Ⅱ Compressor显示文摘The resistance torque of a piston stage Ⅱ compressor generates strenuous fluctuations in a rotational period, and this can lead to negative influences on the working performance of the compressor. To restrain the strenuous fluctuations in the piston stage Ⅱ compressor, a variable duty-cycle control method based on the resistance torque is proposed. A dynamic model of a stage Ⅱ compressor is set up, and the resistance torque and other characteristic parameters are acquired as the control targets. Then, a variable duty-cycle control method is applied to track the resistance torque, thereby improving the working performance of the compressor. Simulated results show that the compressor, driven by the proposed method,requires lower current, while the rotating speed and the output torque remain comparable to the traditional variable-frequency control methods. A variable duty-cycle control system is developed, and the experimental results prove that the proposed method can help reduce the specific power, input power, and working noise of the compressor to 0.97 k W·m^(-3)·min^(-1), 0.09 k W and 3.10 d B,respectively, under the same conditions of discharge pressure of 2.00 MPa and a discharge volume of 0.095 m^3/min. The proposed variable duty-cycle control method tracks the resistance torque dynamically, and improves the working performance of a Stage Ⅱ Compressor. The proposed variable duty-cycle control method can be applied to other compressors, and can provide theoretical guidance for the compressor. | Meipeng ZHONG Shuiying ZHENG | 2017 | Chinese Journal of Mechanical Engineering2017，30，4： | 0 |
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