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A New Elastoplastic 3D Sand Production Model for Fractured Gas Fields
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作者 Hongtao Liu Hongtao Jing +3 位作者 Zhixiong Tu Shiyong Qin Junhui Wei Xiaotong Yu 《Fluid Dynamics & Materials Processing》 EI 2023年第7期1851-1862,共12页
Reservoirs characterized by high temperature,high-pressure,medium high cementation strength,low porosity,and low permeability,in general,are not affected by sand production issues.Since 2009,however,it is known that c... Reservoirs characterized by high temperature,high-pressure,medium high cementation strength,low porosity,and low permeability,in general,are not affected by sand production issues.Since 2009,however,it is known that cases exists where sand is present and may represent a significant technical problem(e.g.,the the Dina II condensate gas field).In the present study,the main factors affecting sand production in this type of reservoir are considered(mechanical properties,stress fields,production system,completion method and gas flow pattern changes during the production process).On this basis,a new liquid-solid coupled porous elasto-plastic 3D sand production model is introduced and validated through comparison with effective sand production data.The related prediction errors are found to be within 15%,which represents the necessary prerequisite for the utilization of such a model for the elaboration of sand prevention measures. 展开更多
关键词 Medium-high strength sand production mechanism fluid-solid coupling sand production prediction dynamic sand production pattern
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Study on Mechanization Hybrid Rice Seed Production Technology and Combine Breeding Advances 被引量:5
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作者 汪婉琳 朱启升 +2 位作者 王士梅 杨前进 张德文 《Agricultural Science & Technology》 CAS 2011年第1期90-92,共3页
[Objectives]Current hybrid rice seed production mechanization and a new kind of hybrid rice seed production mechanization using Bentazone sensitive lethal genes for mechanized seed production technology are introduced... [Objectives]Current hybrid rice seed production mechanization and a new kind of hybrid rice seed production mechanization using Bentazone sensitive lethal genes for mechanized seed production technology are introduced in this paper.[Method]Sensitive Restorer Bentazone lethal dose of filtering,parental and seed weight are bred combinations of several aspects of the system described,and presented mechanized seed technology new research directions.[Results]The method of using Bentazone sensitive lethal genes for mechanized seed production technology is feasible,economic,seed production and combination advantages.[Conclusions] Using Bentazone sensitive lethal genes for mechanized seed production technology is the new study direction of mechanic production. 展开更多
关键词 Hybrid rice Mechanization seed production techniques BENTAZONE-SENSITIVITY-GENE
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Strategies and Suggestions for the Development of Mechanized Rapeseed Production in Sichuan 被引量:1
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作者 蒋俊 蒲晓斌 +3 位作者 张锦芳 李浩杰 牛应泽 蒋梁材 《Agricultural Science & Technology》 CAS 2013年第10期1386-1391,共6页
Mechanization is the future direction of rapeseed production in Sichuan. A series of technology tests for rapeseed mechanized production have been carried out in terms of variety selection, key agronomic measures and ... Mechanization is the future direction of rapeseed production in Sichuan. A series of technology tests for rapeseed mechanized production have been carried out in terms of variety selection, key agronomic measures and machinery in the main production area of Sichuan in recent years. In the research, the agronomic techniques, including variety selection for mechanical production, key agronomic measures and mechanical harvesting were analyzed. Based on the present condi- tions, strategy and suggestions for the development of mechanized rapeseed produc- tion in Sichuan also were presented. 展开更多
关键词 RAPESEED Mechanized production Variety selection Agronomic mea- sures Policy guidance Development strategy
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Research Progress on Mechanized Mixed Sowing Seed Production Technology of Hybrid Rice 被引量:4
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作者 张德文 《Agricultural Science & Technology》 CAS 2017年第5期924-929,939,共7页
Hybrid rice planting has been widely popularized and applied in the world. However, the high cost of seed production and the complicated procedures have become a bottleneck in the development of hybrid rice. The resea... Hybrid rice planting has been widely popularized and applied in the world. However, the high cost of seed production and the complicated procedures have become a bottleneck in the development of hybrid rice. The research progress on mixed sowing seed production techniques of hybrid rice was introduced from the aspects of rice resources creation, breeding, sowing seed technology research and cost benefit analysis. The production technology of the new mixed seeding combina- tion "Xinhunyou 6" was investigated, including the research and validation of benta- zon treatment period and dosage, mixing ratio of male and female parents, and the comparative test of different different sowing methods, which revealed that the mechanization technology of seed production of hybrid rice was mature and feasible and would be one of the most important development trend of technological devel- opment of hybrid rice production. 展开更多
关键词 Hybrid rice Mechanized seed production Glume color marker gene BENTAZON Research progress
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Automated Dimensioning Method of Engineering Drawings for Mechanical Products Based on Curve Chain 被引量:1
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作者 Gui Li Peng Yang 《Computers, Materials & Continua》 SCIE EI 2020年第10期847-863,共17页
An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.According to the internal relation between the features of 3D model feature and elements o... An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.According to the internal relation between the features of 3D model feature and elements of 2D drawing,the curve chain was established to reflect the geometric topological structure between the elements.It divides the dimensions into the absolute dimensions within the cure chain and the relative dimensions between the curve chains.The parallel and lengthy relationship between the drawing elements of the constructed X and Y parallel matrix was solved to remove redundant elements in the curve chain and labeled the absolute dimensions of the remaining valid elements.The average minimum weight coefficient was introduced to judge the dependence on the relative dimensions between curve chains.Through the analysis of the overlap between the circular rectangular areas,including all the absolute dimensions of the curve chains,overlapping curve chains were merged,and their dimensions were rearranged to avoid the cross interference between them.The method was seamlessly integrated into the drafting module of product design software NX,and it developed an automated dimensioning system.The examples show that the system has excellent interactivity and robustness in the dimensioning of product engineering drawings.The dimension information is complete,accurate and reliable. 展开更多
关键词 Automated dimensioning engineering drawing curve chain mechanical product weight coefficient
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Breeding of Yuetang 08776,a New Sugarcane Variety Suitable for Mechanized Production
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作者 Fangyin PAN Mingfu WEN +2 位作者 Lichong PENG Qiru LIANG Qingwen LUO 《Asian Agricultural Research》 2021年第2期43-46,共4页
[Objectives]To study the breeding of a new sugarcane variety Yuetang 08776 suitable for mechanized production.[Methods]With Yuetang 96-86 as the female parent and Yuetang 99-66 as the male parent,Yuetang 08776 was bre... [Objectives]To study the breeding of a new sugarcane variety Yuetang 08776 suitable for mechanized production.[Methods]With Yuetang 96-86 as the female parent and Yuetang 99-66 as the male parent,Yuetang 08776 was bred by the Bioengineering Institute of Guangdong Academy of Sciences.It was approved as a non-major crop variety by the Ministry of Agriculture and Rural Affairs in December,2019.Through many years of multi-pilot trials,the characters,traits and disease resistance of Yuetang 08776 were investigated,and the key points of its cultivation technique were summarized.[Results]Yuetang 08776 is characterized by medium maturity,high sugar content,high and stable yield,strong cold and drought resistance,large number of effective stems,strong ratooning ability and lodging resistance.Yuetang 08776 has excellent agronomic traits,and has been identified as moderately resistant to smut and mosaic disease.The average cane yield of Yuetang 08776 was 119.89 t/ha,18.50 t/ha higher than that of CK,an increase of 18.25%.The average sugar yield was 17.15,2.11 t/ha higher than that of CK,an increase of 14.03%.The average sucrose content of Yuetang 08776 in the early period(November to December)was 13.20%,0.71 percentage points lower than that of CK;in the middle and late period(January to March of the following year),the average sucrose content was 15.23%,0.22 percentage points lower than that of CK;and the average sucrose content of the whole period was 14.21%,0.47 percentage points lower than that of CK.[Conclusions]Yuetang 08776 is a sugarcane variety with medium maturity,high sugar,high and stable yield,strong resistance and good ratooning.It is suitable for mechanized seeding,management and harvesting,and suitable for planting and popularizing in most sugarcane production areas of Guangdong,Guangxi and Yunnan. 展开更多
关键词 Mechanized production New sugarcane variety Yuetang 08776 BREEDING
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Effect and Analysis of Mechanized Production on Ratooning Ability of Guitang 47
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作者 Lunwang WANG Yuchi DENG +4 位作者 Fang TAN Shiyun TANG Hairong HUANG Yan JING Rongzhong YANG 《Agricultural Biotechnology》 CAS 2020年第1期50-53,共4页
[Objectives] This study was conducted to explore the effect of machine harvesting on ratooning ability of Guitang 47, and to provide basis for mechanized production of Guitang 47. [Methods] On the basis of mechanized ... [Objectives] This study was conducted to explore the effect of machine harvesting on ratooning ability of Guitang 47, and to provide basis for mechanized production of Guitang 47. [Methods] On the basis of mechanized planting and management of newly planted sugarcane Guitang 47, a comparative test of machine harvesting and manual harvesting was conducted, during which the plant generation rate, sugarcane yield, sucrose content and related agronomic traits of ratoon cane were continuously investigated in two years after machine harvesting of the newly planted sugarcane. [Results] There were no significant differences in the plant generation rate, plant height, stalk diameter, millable cane, sugarcane yield and sucrose content from manual harvesting of Guitang 47 in the first and second years after machine harvesting. In the second year after machine harvesting, the yields of ratoon cane and the sugar content reached 101.70 and 15.32 t/hm^2, respectively, which were equivalent to those of manual harvesting. [Conclusions] Guitang 47 has strong ratooning ability and lodging resistance and strong resistance to rolling and crushing, and is adaptive to full mechanized production. It should be promoted and accelerated in sugarcane areas lacking labor to reduce costs and increase benefits. 展开更多
关键词 Mechanized production Guitang 47 Ratooning ability Sugarcane yield Sugar content
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Zhangjiakou Mechanical Products
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《China's Foreign Trade》 1995年第1期33-33,共1页
Cuban President Fidel Castro highly praised the products of Zhangjiakou’s Xuanhua Building Machinery Plant at a national conference in 1990. On the president’s recommendations, the Cuban ambassador to China conducte... Cuban President Fidel Castro highly praised the products of Zhangjiakou’s Xuanhua Building Machinery Plant at a national conference in 1990. On the president’s recommendations, the Cuban ambassador to China conducted an on-the-spot investigation and expressed his appreciation of the plant’s products. Besides Cuba, the plant’s products also enjoy a high reputation among customers in Pakistan, Chile, Australia, Papua New Guinea, Ghana and Southeast Asia. Zhangjiakou had its 展开更多
关键词 HIGH Zhangjiakou mechanical Products
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China's Processing Trade Development for Mechanical and Electrical Products
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作者 Wang Jixian 《China's Foreign Trade》 1997年第2期8-9,共2页
Since the launch of the economic reform and opening to the outside world, China has seen rapid growth in its export of mechanical and electrical products, with its export
关键词 US China’s Processing Trade Development for mechanical and Electrical Products MODE
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Seize the Opportunity and Make Efforts to Increase Zhejiang's Export of Mechanical and Electrical Products
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《China's Foreign Trade》 1996年第10期62-62,共1页
Zhejiang’s machine-building industryhas made sustained efforts to increase itsexports through the combination ofindustry and trade. In the past decade,Zhejiang’s export volume of mechanicaland electrical products ha... Zhejiang’s machine-building industryhas made sustained efforts to increase itsexports through the combination ofindustry and trade. In the past decade,Zhejiang’s export volume of mechanicaland electrical products has increased over 10times, becoming the leading exports fromthe province. Zhejiang has thereforebecome an important province exportingmachinery in China. 展开更多
关键词 In Seize the Opportunity and Make Efforts to Increase Zhejiang’s Export of mechanical and Electrical Products USA
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Research on the reliability of the electromechanical products based on the fuzzy theory
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《International English Education Research》 2013年第12期63-65,共3页
Mechanical and electrical products are more and more widely used in all the fields of the society. With the increase in the degree of automation and miniaturization, the structure of many mechanical and electrical pro... Mechanical and electrical products are more and more widely used in all the fields of the society. With the increase in the degree of automation and miniaturization, the structure of many mechanical and electrical products is becoming more and more complex, and the conditions of the use are also increasingly harsh, and therefore more and more product reliability issues are arising, and the reliability technology is being paid more and more attention to. In this paper, aiming at the mechanical and electtical products, from the three aspects of reliability management, reliability design and analysis, and reliability test and evaluation, the reliability research is preliminary studied. 展开更多
关键词 Fuzzy theory mechanical and electrical products RELIABILITY APPLICATION
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Measures for Administration of the Import of Mechanical and Electronic Products
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《China's Foreign Trade》 2008年第14期64-66,共3页
The Measures for the Administration of the Import of Mechanical and Electronic' Products co-formulated by the Ministry of Commerce,the General Administration of Customs and the General Administration of Quality Su... The Measures for the Administration of the Import of Mechanical and Electronic' Products co-formulated by the Ministry of Commerce,the General Administration of Customs and the General Administration of Quality Supervision,Inspection and Quarantine,was hereby promul- gated,which entered into force as of May 1,2008. 展开更多
关键词 Measures for Administration of the Import of mechanical and Electronic Products
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A New Method for Forecasting the Life Test Data of Mechanical Products
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作者 ZHANG Huai-liang, TAN Guanjun, QIU Xian-yan College of Mechanical and Electrical Engineering Central South University Changsha 410083, P R. China 《International Journal of Plant Engineering and Management》 2001年第2期57-64,共8页
The model for forecasting the test data on mechanical products is established in the application of the grey system theories. A new formula of the background value is introduced into the model. The result of an exampl... The model for forecasting the test data on mechanical products is established in the application of the grey system theories. A new formula of the background value is introduced into the model. The result of an example shows the method can reduce test expense and enhance the precision of forecasting. 展开更多
关键词 mechanical product life test data forecast grey system theory
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Key theoretical and technical issues and countermeasures for effective development of Gulong shale oil, Daqing Oilfield, NE China 被引量:2
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作者 YUAN Shiyi LEI Zhengdong +5 位作者 LI Junshi YAO Zhongwen LI Binhui WANG Rui LIU Yishan WANG Qingzhen 《Petroleum Exploration and Development》 SCIE 2023年第3期638-650,共13页
Aiming at the four issues of underground storage state,exploitation mechanism,crude oil flow and efficient recovery,the key theoretical and technical issues and countermeasures for effective development of Gulong shal... Aiming at the four issues of underground storage state,exploitation mechanism,crude oil flow and efficient recovery,the key theoretical and technical issues and countermeasures for effective development of Gulong shale oil are put forward.Through key exploration and research on fluid occurrence,fluid phase change,exploitation mechanism,oil start-up mechanism,flow regime/pattern,exploitation mode and enhanced oil recovery(EOR)of shale reservoirs with different storage spaces,multi-scale occurrence states of shale oil and phase behavior of fluid in nano confined space were provided,the multi-phase,multi-scale flow mode and production mechanism with hydraulic fracture-shale bedding fracture-matrix infiltration as the core was clarified,and a multi-scale flow mathematical model and recoverable reserves evaluation method were preliminarily established.The feasibility of development mode with early energy replenishment and recovery factor of 3o%was discussed.Based on these,the researches of key theories and technologies for effective development of Gulong shale oil are proposed to focus on:(1)in-situ sampling and non-destructive testing of core and fluid;(2)high-temperature,high-pressure,nano-scale laboratory simulation experiment;(3)fusion of multi-scale multi-flow regime numerical simulation technology and large-scale application software;(4)waterless(CO_(2))fracturing technique and the fracturing technique for increasing the vertical fracture height;(5)early energy replenishment to enhance oil recovery;(6)lifecycle technical and economic evaluation.Moreover,a series of exploitation tests should be performed on site as soon as possible to verify the theoretical understanding,optimize the exploitation mode,form supporting technologies,and provide a generalizable development model,thereby supporting and guiding the effective development and production of Gulong shale oil. 展开更多
关键词 Gulong shale oil continental shale oil nano confined space production mechanism flow mode early energy replenishment enhanced oil recovery
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Factors Influencing Price of Agricultural Products and Stability Countermeasures 被引量:4
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作者 TONG Ai-hua 《Asian Agricultural Research》 2012年第4期17-19,43,共4页
Factors leading to rise of prices of agricultural products mainly include tension of supply-demand relationship,promotion of production cost and circulation cost,and speculation of Refugee Capital(Hot Money).Factors l... Factors leading to rise of prices of agricultural products mainly include tension of supply-demand relationship,promotion of production cost and circulation cost,and speculation of Refugee Capital(Hot Money).Factors leading to low price and difficult sales of agricultural products mainly include asymmetry of supply-demand information,lack of risk management tools for prices of agricultural products and decentralized and small-scaled operation of farmers.On the basis of these factors,this paper presents following countermeasures and suggestions for stabilizing prices of agricultural products:firstly,building long-effect mechanism for production and sales of agricultural products;secondly,expand the production and increase supply of agricultural products;thirdly,control the rising range of production cost for agricultural products;fourthly,enhance organization level of farmers;fifthly,promote innovation and development of risk management tools for prices of agricultural products. 展开更多
关键词 Prices of agricultural products Long-effect mechanism of production and sales Information
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Effect Analysis of "One Prevention Double Reduction" of Aerial Control in Corn Fields in Daiyue District, Tai’an City
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作者 Juqing GE 《Plant Diseases and Pests》 CAS 2022年第1期15-17,共3页
The main technical content of full mechanized corn production in Daiyue District is explained,and the problems of disease and insect pest control in the middle and late growth stage of corn in full mechanized producti... The main technical content of full mechanized corn production in Daiyue District is explained,and the problems of disease and insect pest control in the middle and late growth stage of corn in full mechanized production are analyzed."One prevention double reduction"of corn performed by unmanned aerial vehicle(UAV)and self-propelled sprayer is compared and analyzed,and some suggestions are put forward for further popularization and application of full mechanized corn production. 展开更多
关键词 CORN Full mechanized production Aerial control One prevention double reduction
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Intrinsic product polarization and branch ratio in the S(~1D,~3P)+HD reaction on three electronic states
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作者 李琳 董顺乐 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期319-323,共5页
The intrinsic product polarization and intramolecular isotope effect of the S(~1D,~3P) + HD reaction have been investigated on both the lowest singlet state(1A) and the triplet state(3A and 3A) potential energy... The intrinsic product polarization and intramolecular isotope effect of the S(~1D,~3P) + HD reaction have been investigated on both the lowest singlet state(1A) and the triplet state(3A and 3A) potential energy surfaces by using quasi-classical trajectory and quantum mechanical methods.The calculations indicate that intramolecular isotope effects are different on the three electronic states.The stereodynamics study shows that the P(θr) distributions,P(φ r) distributions,and polarization-dependent differential cross sections(PDDCSs)(00) are sensitive to mass factor and the product angular momentum vectors are not only aligned but also oriented. 展开更多
关键词 quasi-classical trajectory quantum mechanics product polarization branch ratio
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Physical characteristics of high-rank coal reservoirs in different coal-body structures and the mechanism of coalbed methane production 被引量:5
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作者 ZHANG XiaoDong DU ZhiGang LI PengPeng 《Science China Earth Sciences》 SCIE EI CAS CSCD 2017年第2期246-255,共10页
The physical characteristics of coal reservoirs are important for evaluating the potential for gas desorption, diffusion, and seepage during coalbed methane (CBM) production, and influence the performance of CBM wel... The physical characteristics of coal reservoirs are important for evaluating the potential for gas desorption, diffusion, and seepage during coalbed methane (CBM) production, and influence the performance of CBM wells. Based on data from mercury injection experiments, low-temperature liquid nitrogen adsorption, isothermal adsorption, initial velocity tests of methane diffusion, and gas natural desorption data from a CBM field, herein the physical characteristics of reservoirs of high-rank coals with different coal-body structures are described, including porosity, adsorption/desorption, diffusion, and seepage. Geometric models are constructed for these reservoirs. The modes of diffusion are discussed and a comprehensive diffusion-seepage model is constructed. The following conclusions were obtained. First, the pore distribution of tectonically deformed coal is different from that of normal coal. Compared to normal coal, all types of pore, including micropores (〈10 nm), transitional pores (10-100 nm), mesopores (100-1000 nm), and macropores (〉1000 nm), are more abundant in tectonically deformed coal, especially mesopores and macropores. The increase in pore abundance is greater with increasing tectonic deformation of coal; in addition, the pore connectivity is altered. These are the key factors causing differences in other reservoir physical characteristics, such as adsorption/desorption and diffusion in coals with different coal-body structures. Second, normal and cataclastic coals mainly contain micropores. The lack of macropores and its bad connectivity limit gas desorption and diffusion during the early stage of CBM production. However, the good connectivity of micropores is favorable for gas desorption and diffusion in later gas production stage. Thus, because of the slow decline in the rate of gas desorption, long-term gas production can easily be obtained from these reservoirs. Third, under natural conditions the adsorption/desorption properties of granulated and mylonitized coal are good, and the diffusion ability is also enhanced. However, for in situ reservoir conditions, the high dependence of reservoir permeability on stress results in a weak seepage of gas; thus, desorption and diffusion is limited. Fourth, during gas production, the pore range in which transitional diffusion takes place always increases, but that for Fick diffusion decreases. This is a reason for the reduction in diffusion capacity, in which micropores and transitional pores are the primary factors limiting gas diffusion. Finally, the proposed comprehensive model of CBM production under in situ reservoir conditions elucidates the key factors limiting gas production, which is helpful for selection of reservoir stimulation methods. 展开更多
关键词 High-rank coal Coal-body structure Reservoir physical characteristics Gas production mechanism
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The original mechanism of vari-toned song production in mingming cicada(Oncotympana maculaticollis Motsch)
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作者 JIANG Jinchang,WAND Yongbin, XUMuling,ZHAND Hong and CHENHao(Institute of Biophysics, Academi a Sinica, Beijing 100080) 《Chinese Journal of Acoustics》 1991年第3期274-282,共9页
In this paper, the original process of vari-toned song in the Mmgming cicada is revealed, and the brand-new recognition for studies of the song mechanism in cicadas is opened up. Each vari-toned syllable 'Weiying&... In this paper, the original process of vari-toned song in the Mmgming cicada is revealed, and the brand-new recognition for studies of the song mechanism in cicadas is opened up. Each vari-toned syllable 'Weiying' is composed of 'Wei' with the basic sound (BS) as the dominant tone and 'ying' with the upper partials (UP2) as the dominant tone, and the upper partials (UP1) is a sound accompaniment of low intensity.The BS, UP1 and UP2 are produced by vibrations of the long ribs LR2,3 and LR1 in sounding membrane driven, separately, by two kinds of the twich in sounding muscle, 'Wei' and 'ying' are separately produced by the prin-subordinate vibrations of LR2,3 -LR1 and LR1-LR2,3. The LR1 and LR2,3 are analogous to a string tensioned two ends and a beam hinged two ends with a load in the middle respectively. Obtained the acoustic properties of sounding vibration are not only suited to the structural characteristics of LR1, 2, 3 but also consist basically with the acoustic properties of song. 展开更多
关键词 LRI The original mechanism of vari-toned song production in mingming cicada Oncotympana maculaticollis Motsch
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Interior noise field of a viscoelastic cylindrical shell excited by TBL pressure fluctuations:Ⅰ.Production mechanisms of the noise
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作者 TANG Weilin and WU Yi (Harbin Engineering University Harbin 150001) 《Chinese Journal of Acoustics》 1997年第4期289-300,共12页
Applying the wavenumber frequency transfer function to describe the whole system including tht elastic cylindrical shell and the fluid loading, a general expression of the cross spectrum of the interior noise induced ... Applying the wavenumber frequency transfer function to describe the whole system including tht elastic cylindrical shell and the fluid loading, a general expression of the cross spectrum of the interior noise induced by the TBL (turbulent boundary layer) pressure fiuctuations is derived. There are two production mechanisms of the noise: one is direct transfer of the convective ridge of the pressure fluctuations through the shell, the other is the reradiation of resonance modes excited by the pressure fluctuations. At low frequencies the noise produced by the latter mechanism is dominant. Solving the frequency equation of the cylindrical shell with liquid loading, the two Stoneley-type poles in the complex K plane are presented. They are the major sources of the reradiation of shell at low frequencies. Finally, effects of the shell radius, shell thickness, absorption of material and the flow speeds on the noise reduction are computed by numerical iniegration. 展开更多
关键词 production mechanisms of the noise Am Interior noise field of a viscoelastic cylindrical shell excited by TBL pressure fluctuations TBL
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