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Strawberry (Fragaria spp.): Cultivation, Production, Consumption, and Marketing in Cameroon
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作者 Djeuani Astride Carole Moutamal Djem Rose Theophine Derricka +21 位作者 Mbouobda Hermann Désiré Abdoulaye Souaibou Meliga Essimi Célestine Bouopda Nono Joël Anafack Donasson Dioril Messouang Bernard Didier Ndongo III Boris Charlen Kaffo Emmanuel Kamga Fossouo Anselme Xavier Tiki Antoine Marie Kevin Nyimiebolo Bengono Audrey Maguy Manuela Diobe Motassy Adounga Samuel Brice Amama Amama Benjamin Nshanji Jones Panguepko Fendju Christophe Nzie Oussena Nguetrapouna Issofa Mpon Ikoyin Linda NKouéya Christelle Ladone Amang Amang A. Ziem Niemenak Nicolas 《Agricultural Sciences》 2024年第4期449-471,共23页
Strawberry (Fragaria spp.) is one of the most important fruits classified as exotic fruits imported into Cameroon. To have an inventory of its cultivation in Cameroon, a survey study was carried out among eight farms ... Strawberry (Fragaria spp.) is one of the most important fruits classified as exotic fruits imported into Cameroon. To have an inventory of its cultivation in Cameroon, a survey study was carried out among eight farms of Fragaria spp. from January 2021 to February 2022. The plant was introduced in Cameroon in 2018. There are 13 varieties of Fragaria spp. currently cultivated. Among these 13 varieties, eleven are hybrids of Fragaria x ananassa (“Amiga”, “Amine”, “Camarosa”, “Chandler”, “Charlotte”, “Elsanta”, “Gariguette”, “Madame Moutot”, “Ostara”, “Ruby gem” and “San Andreas”), and two of the hybrids of Fragaria vesca (“Maestro” and “Mara des bois”). The cropping system, irrigation system, and type of fertilizers applied differ from one strawberry farm to another. Biofertilizers (such as mycorrhizal), inorganic and organic fertilizers are actually used to improve production. The potential annual production of strawberries from January 2021 to February 2022, estimated based on the survey data, was 21.216 tons for all growers. Among these eight production farms, the Lolodorf BIO Farm presents 6000 kg (six tons) of strawberries and 100,000 stolons (seedlings) produced, from seven varieties of Fragaria spp. cultivated, with 6 varieties which are hybrids variety Fragaria x ananassa (“Amiga”, “Amine”, “Chandler”, “Gariguette”, “Madame Moutot”, and “Ruby gem”), and one which is a hybrid of Fragaria vesca (“Mara des bois”). Certain diseases were also observed and recorded depending on the growing areas. 展开更多
关键词 Fragaria spp. Cultivation Technique Attack of Pathogens Annual production Cameroon
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Analysis of Southern Taihang Tourism Production and Research on Brand Marketing Strategy based on SWOT and PST
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作者 XU Zhen-tao ZHU wei 《International Journal of Technology Management》 2016年第1期67-69,共3页
Under the new normal economic environment, the traditional tourism faces competition, but also new opportunities in the emerging service industry. Thus, to enrich the expanding tourist market is a powerful guarantee o... Under the new normal economic environment, the traditional tourism faces competition, but also new opportunities in the emerging service industry. Thus, to enrich the expanding tourist market is a powerful guarantee of industrial development. Market research is based on binding to the marketing environment analysis to determine the product' s marketing strategy in order to better expand the market space. In this paper, SWOT method and PST tourist area on the South Taihang existing tourism products for analysis, several strategies Taihang Xinxiang south of brand marketing. 展开更多
关键词 SWOT PST Brand marketing Festival marketing Green marketing
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Cassava sector development in Cameroon: Production and marketing factors affecting price
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作者 Elise Stephanie Meyo Mvodo Dapeng Liang 《Agricultural Sciences》 2012年第5期651-657,共7页
Regular and available supply is the prerequisite of an effective and efficient commercialization process. Using multivariate regression analysis on field data, this research appraises the production and marketing fact... Regular and available supply is the prerequisite of an effective and efficient commercialization process. Using multivariate regression analysis on field data, this research appraises the production and marketing factors that influence cassava market price. The production factors include cultivated area, planting material, yield, and farmers’ field schools;while farmers access to a paved road, having a telephone, the transportation costs of fresh roots, the level of root perishability, and the prices of rice and maize stand as marketing factors. The results show that farmers who attended farmers’ field school adopted improved planting materials, propagated them in their localities and the yields in these communities increased significantly. The farm size also has a significant influence on the availability of fresh roots. On the marketing side, transportation costs, access to a paved road, the prices of rice and maize significantly affect cassava’s market price and tighten the relationship between producers and marketers. We conclude that to increase fresh roots supply, roads leading to cultivating areas should be paved, better transportation provided, communication costs reduced, even distribution of planting materials and appropriate warehouses. 展开更多
关键词 production FACTORS marketing FACTORS CASSAVA MARKET PRICE Cameroon
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Production Forecast of Citrus in China and Production and Marketing Situation of Citrus in Chongqing in 2016 Production Season
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作者 Wenbin KONG Zhuohua ZENG +2 位作者 Wei XIONG Zhengliang WU Renbin XIA 《Asian Agricultural Research》 2018年第2期16-19,31,共5页
According to the statistics of the Ministry of Agriculture,the planting area of citrus would increase steadily,and the yield would decline slightly,2. 556 7 million ha and 36. 168 million t,respectively. Compared with... According to the statistics of the Ministry of Agriculture,the planting area of citrus would increase steadily,and the yield would decline slightly,2. 556 7 million ha and 36. 168 million t,respectively. Compared with 2015,the planting area would increase by 1. 97% and the yield would increase by 1. 17%. According to the production scheduling of Chongqing Agricultural Commission,the citrus production in Chongqing in 2016 would continue to maintain a steady and rapid growth,the estimated area and yield were 0. 206 7 million ha and 2. 8 million t,increasing by 4. 27% and 4. 48% compared with 2015 respectively. By the end of November 2016,most of mature citrus products in Chongqing would show different degree of rise in purchasing price,while the purchasing price of red orange and some processed raw material fruits would show different amplitude of decline. On the whole,the production and marketing situation of Chongqing citrus would become better. 展开更多
关键词 CITRUS Situation analysis production and marketing forecast CHONGQING
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Small Ruminant Production and Marketing Practices in Harawa, Somali Region, Ethiopia
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作者 Samatar Abshir Mahamed Hawa Yusuf Ali 《Open Journal of Animal Sciences》 CAS 2023年第2期249-262,共13页
Small ruminant production is an essential component of agricultural activity for smallholder farmers. The aim of this study was to assess small ruminant production and marketing practices in the Harawa district of Som... Small ruminant production is an essential component of agricultural activity for smallholder farmers. The aim of this study was to assess small ruminant production and marketing practices in the Harawa district of Somali Region, Ethiopia. For the study 90 households owning small ruminant were selected from three different towns of Harawa district. Information on sheep and goat ownership patterns, production objectives, and management and production constraints were collected from 90 households using semi structured questionnaires. The available feed resources are grass species, crop aftermath and legumes species are the common ones. The average family size was 5.78 ± 0.235 persons per household. Crop-livestock farming was the commonly used farming system with (62.75%) extensive and (27.25%) semi-intensive production system. The mean total land holding was 6.08 ± 0.24 ha per HH and was significantly (P < 0.05) varied across production systems. On average, the sample households owned 46.32 ± 1.22 sheep, 38.28 ± 1.40 goat, 4.85 ± 0.43 cattle, 4.15 ± 0.54 camel, 2.18 ± 0.19 donkey and 0.53 ± 0.20 poultry. The finding shows most of the respondents kept sheep and goats for insurance as ranked first. Feed shortage was ranked first as the main constraint hindering sheep and shortage of veterinary service, drought, disease, water shortage and poor infrastructure were the other major constraints of sheep and goat production in the study area. The major production and marketing constraints in small ruminant production in the area are disease and parasite (cadho), feed and grazing land shortage, low productivity, poor veterinary service and poor of infrastructure. Therefore, it is important to use modern production systems with improved technology in the area and improve traditional system through feed supplementation and better health care. As well as improving marketing efficiency through appropriate policy and provision of information is important. 展开更多
关键词 CONSTRAINTS Harawa marketing production Small Ruminant
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Impact of Khat Production and Marketing on the Livelihood of Smallholder Households in Ethiopia
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作者 Tofik Abdella Dawide Fresenbet Zeleke Mustefa Musse Ebro 《Agricultural Sciences》 CAS 2022年第12期1309-1320,共12页
Khat, Ethiopia’s largest export cash crop, is the backbone of the Ethiopian economy. However, Ethiopia has not yet fully promoted its position as the utmost producer and exporter of khat in a global market because of... Khat, Ethiopia’s largest export cash crop, is the backbone of the Ethiopian economy. However, Ethiopia has not yet fully promoted its position as the utmost producer and exporter of khat in a global market because of its different policy discourses and illegal trade issues on khat production. The life of many smallholder households relies on khat production and its marketing in a country. Hence for thus, some information has been gathered on different aspects of khat with the objectives of reviewing khat’s impacts on the livelihood of smallholder farmers, its production status, and marketing constraints in Ethiopia. To review these objectives, data from CSA, and different published materials on khat were used. According to the review, khat production has a positive impact on securing household food insecurity and improving the livelihood status of smallholder farmers, and the largest foreign exchange-earning cash crops. However, it is exploited almost in all parts of a country’s government policy discourse on khat production and its trade legal issues, lack of infrastructure, zero access to extension services, zero tangible value addition, inadequate technology transfer, and research, and price volatility because of product perishability behavior are among major constraints threatened in khat production in Ethiopia. Its vulnerable and corrupted marketing system, zero market promotion and political dichotomy, long market chain, chronic market information, and unfair price were reported by different scholars as major problems of khat marketing in Ethiopia. From these probs: The government should analyze why and its impact on khat production discourse policy on the livelihood of smallholder households and overlook positive policy proclamation. Encouraging research and technology transfer to transform products into manufacturing industries, enhancing infrastructural and institutional facilities, and improving khat production product technologies through development, and khat production agribusiness industry transformation, institutionalizing its marketing arrangement and other related agronomic practices are among the major recommendations to forward so. 展开更多
关键词 KHAT production Status Smallholder Livelihood Impact marketing Constraints
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How to Improve the Production of Wild Almond and Marketing in Chengde
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作者 张艳 《河北旅游职业学院学报》 2010年第1期91-92,共2页
The paper discusses how to improve the production of the wild almond in the mountain areas.The fact that improves the techniques and gets more production of the wild almond can not only help the farmers to be wealthy,... The paper discusses how to improve the production of the wild almond in the mountain areas.The fact that improves the techniques and gets more production of the wild almond can not only help the farmers to be wealthy,but also increase the land to be utilized.The price will drop as production increases and then consumer groups will be expanded.In this way,it is easy to increase the economic effi ciency of the enterprise.So in this paper a survey is made on consuming the almond. 展开更多
关键词 DEVELOPMENT marketing nutritional value wild almond
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Potato Seed Supply, Marketing and Production Constraints in Eritrea
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作者 Biniam Mesfin Ghebreslassie S. Mwangi Githiri +1 位作者 Tadesse Mehari Remmy W. Kasili 《American Journal of Plant Sciences》 2014年第24期3684-3693,共10页
Potato is an important vegetable crop in Eritrea contributing significantly to food security. Despite its importance, however, production and thus supply of the crop in the market are limited. The current study is des... Potato is an important vegetable crop in Eritrea contributing significantly to food security. Despite its importance, however, production and thus supply of the crop in the market are limited. The current study is designed to understand the seed supply system, marketing out lets and major production constraints. The survey was conducted in the two main potato producing Zobas of the country (Zoba Maekel and Zoba Debub). Qualitative and quantitative data was generated using focus group discussion (PRA) and semi structured questionnaire, respectively. A total of 20 villages were visited and 138 farmers were interviewed. The finding revealed that there is no standard seed supply system thus majority (91.3%) of the growers purchase seed from open market with a limited supply from the Ministry of Agriculture. Furthermore, about 63% of the farmers from Zoba Maekel reserve their own seed for the next cycle compared to 53.6% from Zoba Debub. It was noted that the Tsaeda embaba variety grows predominantly in the country owing to its yield and resistance. Majority of the growers rely on tuber colour and shape for variety identification, thus over 76% prefer the round shaped and white coloured variety. The potential marketing outlets include wholesale, retailer and direct to consumers. Majority (78.3%) of the interviewed growers indicated that large portion of their produce is marketed via wholesaler followed by retailers (27.5%). Main production limiting constraints are identified as low input supplies, availability and cost of clean seeds, pest pressure while huge market demand and access to transportation are considered as potentials encouraging grower. It is, therefore, recommended that an immediate action to establish sustainable seed supply system is taken into consideration in line with a regular extension service to provide technical advice to growers. 展开更多
关键词 POTATO SEED Source marketing CONSTRAINTS POTENTIALS
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Vegetable Seed Production and Marketing in China
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作者 Zou Xuexiao Hunan Academy of Agricultural Sciences, Changsha 410125, China 《Agricultural Science & Technology》 CAS 2002年第1期8-12,共5页
Since 1980s achievements and experience in vegetable breeding, seed production, preservation, quality test, packing and marketing in China are reviewed.
关键词 VEGETABLE seed SEED production SEED MANAGEMENT
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The Overview and Prospects for Production and Marketing of Cashew Nut in the World
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作者 Shujuan ZHENG Jinhui LUO 《Asian Agricultural Research》 2013年第8期1-4,9,共5页
In this article,we analyze the cultivation and production of cashew in the world during the period 2005-2010,and make a concrete analysis of the import and export trade of cashew nut in the world in recent years.In pa... In this article,we analyze the cultivation and production of cashew in the world during the period 2005-2010,and make a concrete analysis of the import and export trade of cashew nut in the world in recent years.In particular,we give an overview of the production and trade in major producing countries of cashew such as Vietnam and India.Finally,we analyze the nutritional value,pharmaceutical and industry role of cashew nut,and look into the future of development of the cashew nut industry in the world. 展开更多
关键词 CASHEW NUT production EXPORT IMPORT World
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Marketing of African Walnut [Tetracarpidium conophorum Mull. (Arg)] in Southwest Nigeria: Production Issues and Contributions to Stakeholders
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作者 F. D. Babalola 《Journal of Agricultural Science and Technology(B)》 2011年第4期523-531,共9页
The survey was carried out in Ekiti, Oyo, Ogun, Ondo, and Osun states located in SW Nigeria. The respondents for the study include thirty marketers and thirty producers of African walnut randomly selected within each ... The survey was carried out in Ekiti, Oyo, Ogun, Ondo, and Osun states located in SW Nigeria. The respondents for the study include thirty marketers and thirty producers of African walnut randomly selected within each of the state, making a total of 60 respondents per state and 300 for the five states. Two sets of structured questionnaires were designed, one for each eatergory of the respondents. The questionnaires were designed to solicit information on demographic characteristics of the producers and marketers of African walnut, production and marketing challenges of the walnut, price trend along the marketing chain, and interraction and relationships of the middlemen. The questionnaires were administered through individual and focus group methods. Also, indepth interview of the respondents was conducted to supplement data obtained from the questionnaires. Purposive sampling method was used to select local markets where the walnut were sold for study of the price trend of the walnut for two seasons (from 2007 to 2008). Marketing of the walnut started with farmers that plant the perennial climber on their farmland, while the marketing intermediaries include the village merchants, wholesalers, and the retailers. Adult male dominated the production sector of African walnut while processing and marketing the nuts were mostly done by the women and children. There is high demand for the walnut as delicacy and snack; although industrial usage is yet to be fully developed. Marketing of the cooked nuts and at retail quantity had the highest profit along the marketing chain. There is need for expansion of the current scale of production of the walnut to meet increasing demand. Provision of appropriate storage facilities to prevent spoilage of the product in rural areas and good rural road network for easy conveyance to urban markets where it is majorly consumed is pertinent for marketing of the walnut. 展开更多
关键词 Africa walnut marketing chain selling price retail quantities wholesaler village merchant storage facility.
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Forecasting on Indonesian Coal Production and Future Extraction Cost: A Tool for Formulating Policy on Coal Marketing
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作者 Fadhila Achmadi Rosyid Tsuyoshi Adachi 《Natural Resources》 2016年第12期677-696,共20页
Since 2011 Indonesia has become the world’s largest exporter of steam coal. Two supporting factors of Indonesia to be the largest exporter are its enormous production and low operating cost. This paper foresees the p... Since 2011 Indonesia has become the world’s largest exporter of steam coal. Two supporting factors of Indonesia to be the largest exporter are its enormous production and low operating cost. This paper foresees the production and extraction cost of Indonesian coal in the coming period to evaluate marketing policies and estimate the cost of Indonesian coal supply in domestic market as well as in export market. The production forecasting is carried out by Gompertz curve. Peak production of Indonesian coal is expected to take place in 2026. Moreover, the extraction cost in coal basins which produce high calorific value of coal, in accordance to the operating cost forecasting, is higher than the one with low calorific value of coal due to its higher stripping ratio. Three main basins of Central Sumatra, Tarakan, and Barito basins play major rule in supplying coal for domestic use in short term. And other coal basins such as South Sumatra, Kutai, Bengkulu, and Ombilin basins provide long term supply in the domestic and export markets. 展开更多
关键词 Indonesian Coal production Forecast Cost Estimates
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Analysis and Thinking on Citrus Production and Marketing Situation of Hunan Province in 2017
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作者 Ruifeng YIN 《Asian Agricultural Research》 2018年第9期32-37,共6页
In 2017,both the planting area and yield of the citrus in Hunan Province increased,but some production areas suffered decline in yield due to abnormal climate. The sales price of citrus in the whole province increased... In 2017,both the planting area and yield of the citrus in Hunan Province increased,but some production areas suffered decline in yield due to abnormal climate. The sales price of citrus in the whole province increased compared with the previous year,and the sales progress was faster than the previous year. Due to the much increase of planting costs,the income of citrus growers declined. Therefore,it is recommended to promote the development of citrus industry in Hunan Province through strengthening the overall planning of the industry,consolidating the seed base,developing primary processing and deep processing,and enhancing brand building. 展开更多
关键词 柑橘 种植面积 农业 经济发展
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Crosstalk between degradation and bioenergetics: how autophagy and endolysosomal processes regulate energy production
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作者 Angelid Pabon Jagannatham Naidu Bhupana Ching-On Wong 《Neural Regeneration Research》 SCIE CAS 2025年第3期671-681,共11页
Cells undergo metabolic reprogramming to adapt to changes in nutrient availability, cellular activity, and transitions in cell states. The balance between glycolysis and mitochondrial respiration is crucial for energy... Cells undergo metabolic reprogramming to adapt to changes in nutrient availability, cellular activity, and transitions in cell states. The balance between glycolysis and mitochondrial respiration is crucial for energy production, and metabolic reprogramming stipulates a shift in such balance to optimize both bioenergetic efficiency and anabolic requirements. Failure in switching bioenergetic dependence can lead to maladaptation and pathogenesis. While cellular degradation is known to recycle precursor molecules for anabolism, its potential role in regulating energy production remains less explored. The bioenergetic switch between glycolysis and mitochondrial respiration involves transcription factors and organelle homeostasis, which are both regulated by the cellular degradation pathways. A growing body of studies has demonstrated that both stem cells and differentiated cells exhibit bioenergetic switch upon perturbations of autophagic activity or endolysosomal processes. Here, we highlighted the current understanding of the interplay between degradation processes, specifically autophagy and endolysosomes, transcription factors, endolysosomal signaling, and mitochondrial homeostasis in shaping cellular bioenergetics. This review aims to summarize the relationship between degradation processes and bioenergetics, providing a foundation for future research to unveil deeper mechanistic insights into bioenergetic regulation. 展开更多
关键词 AUTOPHAGY BIOENERGETICS endolysosome energy production GLYCOLYSIS metabolic reprogramming MITOCHONDRIA
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Impact of Sharing Marketing on Marketing Willingness of Employees in Internet Decoration Industry
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作者 Zhongxin LI 《Asian Agricultural Research》 2024年第1期10-13,共4页
With the development of information technology,sharing marketing,as an innovative marketing method,plays an important role in promoting the marketing willingness and enthusiasm of employees in the Internet decoration ... With the development of information technology,sharing marketing,as an innovative marketing method,plays an important role in promoting the marketing willingness and enthusiasm of employees in the Internet decoration industry.Based on the data obtained from the ques-tionnaire survey,this paper makes an empirical analysis of the impact of the economic value,social value,perceived ease of use,perceived convenience,enabling conditions and subjective norms of sharing marketing on the marketing willingness of employees in the Internet decoration industry.The results showed that the questionnaire had good internal consistency and construct validity.Through empirical analysis,it can be found that the economic value,social value,perceived ease of use,perceived convenience,enabling conditions and subjective norms of sharing marketing have a significant positive impact on employees'marketing willingness. 展开更多
关键词 marketing Sharing marketing Internet decoration marketing willingness
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Mechanical Modeling and Analysis of Stability Deterioration of Production Well During Marine Hydrate Depressurization Production 被引量:1
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作者 SUN Huan-zhao CHANG Yuan-jiang +4 位作者 SUN Bao-jiang WANG Kang CHEN Guo-ming LI Hao DAI Yong-guo 《China Ocean Engineering》 SCIE EI CSCD 2024年第2期338-351,共14页
Different from oil and gas production,hydrate reservoirs are shallow and unconsolidated,whose mechanical properties deteriorate with hydrate decomposition.Therefore,the formations will undergo significant subsidence d... Different from oil and gas production,hydrate reservoirs are shallow and unconsolidated,whose mechanical properties deteriorate with hydrate decomposition.Therefore,the formations will undergo significant subsidence during depressurization,which will destroy the original force state of the production well.However,existing research on the stability of oil and gas production wells assumes the formation to be stable,and lacks consideration of the force exerted on the hydrate production well by formation subsidence caused by hydrate decomposition during production.To fill this gap,this paper proposes an analytical method for the dynamic evolution of the stability of hydrate production well considering the effects of hydrate decomposition.Based on the mechanical model of the production well,the basis for stability analysis has been proposed.A multi-field coupling model of the force state of the production well considering the effect of hydrate decomposition and formation subsidence is established,and a solver is developed.The analytical approach is verified by its good agreement with the results from the numerical method.A case study found that the decomposition of hydrate will increase the pulling-down force and reduce the supporting force,which is the main reason for the stability deterioration.The higher the initial hydrate saturation,the larger the reservoir thickness,and the lower the production pressure,the worse the stability or even instability.This work can provide a theoretical reference for the stability maintaining of the production well. 展开更多
关键词 natural gas hydrate production well depressurization production formation deformation stability deterioration
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Evolving patterns of agricultural production space in China:A network-based approach
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作者 Shuhui Yang Zhongkai Li +2 位作者 Jianlin Zhou Yancheng Gao Xuefeng Cui 《Geography and Sustainability》 CSCD 2024年第1期121-134,共14页
The agricultural production space,as where and how much each agricultural product grows,plays a vital role in meeting the increasing and diverse food demands.Previous studies on agricultural production patterns have p... The agricultural production space,as where and how much each agricultural product grows,plays a vital role in meeting the increasing and diverse food demands.Previous studies on agricultural production patterns have predominantly centered on individual or specific crop types,using methods such as remote sensing or statistical metrological analysis.In this study,we characterize the agricultural production space(APS)by bipartite network connecting agricultural products and provinces,to reveal the relatedness between diverse agricultural products and the spatiotemporal characteristic of provincial production capabilities in China.The results show that core products are cereal,pork,melon,and pome fruit;meanwhile the milk,grape,and fiber crop show an upward trend in centrality,which is in line with diet structure changes in China over the past decades.The little changes in community components and structures of agricultural products and provinces reveal that agricultural production patterns in China are relatively stable.Additionally,identified provincial communities closely resemble China's agricultural natural zones.Furthermore,the observed growth in production capabilities in North and Northeast China implies their potential focus areas for future agricultural production.Despite the superior production capa-bilities of southern provinces,recent years have witnessed a notable decline,warranting special attentions.The findings provide a comprehensive perspective for understanding the complex relationship of agricultural prod-ucts'relatedness,production capabilities and production patterns,which serve as a reference for the agricultural spatial optimization and agricultural sustainable development. 展开更多
关键词 Agricultural system Complex network Agricultural production space Proximity matrix production capability
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Optimization of Gas Production from Hydrate-Bearing Sediments with Fluctuation Characteristics
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作者 LI Yaobin XU Tianfu +3 位作者 XIN Xin YU Han YUAN Yilong ZHU Huixing 《Journal of Ocean University of China》 SCIE CAS CSCD 2024年第3期618-632,共15页
As an important source of low-carbon,clean fossil energy,natural gas hydrate plays an important role in improving the global energy consumption structure.Developing the hydrate industry in the South China Sea is impor... As an important source of low-carbon,clean fossil energy,natural gas hydrate plays an important role in improving the global energy consumption structure.Developing the hydrate industry in the South China Sea is important to achieving‘carbon peak and carbon neutrality’goals as soon as possible.Deep-water areas subjected to the action of long-term stress and tectonic movement have developed complex and volatile terrains,and as such,the morphologies of hydrate-bearing sediments(HBSs)fluctuate correspondingly.The key to numerically simulating HBS morphologies is the establishment of the conceptual model,which represents the objective and real description of the actual geological body.However,current numerical simulation models have characterized HBSs into horizontal strata without considering the fluctuation characteristics.Simply representing the HBS as a horizontal element reduces simulation accuracy.Therefore,the commonly used horizontal HBS model and a model considering the HBS’s fluctuation characteristics with the data of the SH2 site in the Shenhu Sea area were first constructed in this paper.Then,their production behaviors were compared,and the huge impact of the fluctuation characteristics on HBS production was determined.On this basis,the key parameters affecting the depressurization production of the fluctuating HBSs were studied and optimized.The research results show that the fluctuation characteristics have an obvious influence on the hydrate production of HBSs by affecting their temperatures and pressure distributions,as well as the transmission of the pressure drop and methane gas discharge.Furthermore,the results show that the gas productivity of fluctuating HBSs was about 5%less than that of horizontal HBSs.By optimizing the depressurization amplitude,well length,and layout location of vertical wells,the productivity of fluctuating HBSs increased by about 56.6%. 展开更多
关键词 natural gas hydrate numerical simulation fluctuation characteristics depressurization production production well optimization
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Tea Production Response to Seasonal Rainfall Variability: Evidence from Rwanda
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作者 Joseph Ndagijimana Athanase Hafashimana 《Agricultural Sciences》 2024年第8期909-938,共30页
Tea is a very important cash crop in Rwanda, as it provides crucial income and employment for farmers in poor rural areas. From 2017 to 2020, this study was intended to determine the impact of seasonal rainfall on tea... Tea is a very important cash crop in Rwanda, as it provides crucial income and employment for farmers in poor rural areas. From 2017 to 2020, this study was intended to determine the impact of seasonal rainfall on tea output in Rwanda while still considering temperature, plot size (land), and fertiliser for tea plantations in three of Rwanda’s western, southern, and northern provinces, western province with “Gisovu” and “Nyabihu”, southern with “Kitabi”, and northern with “Mulindi” tea company. The study tested the level of statistical significance of all considered variables in different formulation of panel data models to assess individual behaviour of independent variables that would affect tea production. According to this study, a positive change in rainfall of 1 mm will increase tea production by 0.215 percentage points of tons of fresh leaves. Rainfall is a statistically significant variable among all variables with a positive impact on tea output Qitin Rwanda’s Western, Southern, and Northern provinces. Rainfall availability favourably affects tea output and supports our claim. Therefore, there is a need for collaboration efforts towards developing sustainable adaptation and mitigation options against climate change, targeting tea farming and the government to ensure that tea policy reforms are targeted towards raising the competitiveness of Rwandan tea at local and global market. 展开更多
关键词 Tea production Climate Change production Technology Seasonal Variability Panel Data Models
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Gas-Water Production of a Continental Tight-Sandstone Gas Reservoir under Different Fracturing Conditions
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作者 Yan Liu Tianli Sun +1 位作者 Bencheng Wang Yan Feng 《Fluid Dynamics & Materials Processing》 EI 2024年第6期1165-1180,共16页
A numerical model of hydraulic fracture propagation is introduced for a representative reservoir(Yuanba continental tight sandstone gas reservoir in Northeast Sichuan).Different parameters are considered,i.e.,the inte... A numerical model of hydraulic fracture propagation is introduced for a representative reservoir(Yuanba continental tight sandstone gas reservoir in Northeast Sichuan).Different parameters are considered,i.e.,the interlayer stress difference,the fracturing discharge rate and the fracturing fluid viscosity.The results show that these factors affect the gas and water production by influencing the fracture size.The interlayer stress difference can effectively control the fracture height.The greater the stress difference,the smaller the dimensionless reconstruction volume of the reservoir,while the flowback rate and gas production are lower.A large displacement fracturing construction increases the fracture-forming efficiency and expands the fracture size.The larger the displacement of fracturing construction,the larger the dimensionless reconstruction volume of the reservoir,and the higher the fracture-forming efficiency of fracturing fluid,the flowback rate,and the gas production.Low viscosity fracturing fluid is suitable for long fractures,while high viscosity fracturing fluid is suitable for wide fractures.With an increase in the fracturing fluid viscosity,the dimensionless reconstruction volume and flowback rate of the reservoir display a non-monotonic behavior,however,their changes are relatively small. 展开更多
关键词 Tight sandstone gas reservoir fracture propagation flowback rate gas production law water production law influencing factor
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