The smallholder irrigation sector in Kenya is considered inadequately developed. The study views unawareness of critical success factors in the smallholder irrigation sector as contributing to poor performance of smal...The smallholder irrigation sector in Kenya is considered inadequately developed. The study views unawareness of critical success factors in the smallholder irrigation sector as contributing to poor performance of smallholder irrigation projects. Consequently, the study investigated influence of farmer capacity building in institutional linkages on performance of smallholder irrigation projects in Migori County, Kenya. The study embraced a pragmatic view of philosophy, and used cross sectional and correlation research design. The target population was 2815, and comprised farmers drawn from fifteen smallholder irrigation projects that receive water from River Kuja through Lower Kuja Project. The sample size was 341. The study used systematic random sampling procedure to draw the sample, and collected data using questionnaire. Data was analysed using descriptive and inferential statistics. The study established that farmer capacity building in institutional linkages has a significant influence on performance of smallholder irrigation projects (r = 0.803, R<sup>2</sup> = 0.645, F (5, 331) = 120.254 and p < 0.000 < 0.05). Thus, the study recommends that Migori County Government come up with policies that link smallholder irrigation projects in Lower Kuja Project to institutions that provide land ploughing services, certified seeds and fertilisers, control of crop pests and diseases, transportation of farm produce and marketing of farm produce.展开更多
The irrigation and water conservancy project provides the basic guarantee for the rural agricultural economic development, and requires greater function and effect in water supply, drainage, waterlogging, drought prev...The irrigation and water conservancy project provides the basic guarantee for the rural agricultural economic development, and requires greater function and effect in water supply, drainage, waterlogging, drought prevention, irrigation and other farmland services. However, there are still some problems in the management of farmland water conservancy project, such as imperfect system, unclear responsibility and inactive subject, which hinder the development of farmland water conservancy project to a certain extent. In the context of building a new countryside, the management of irrigation and water conservancy projects should implement and Xi Jining New Era Socialism with Chinese Characteristics, adhere to the concept of scientific development, focus on the overall situation, seek benefits from management, and promote the high-quality development of project management.展开更多
The financial aspects of large-scale engineering construction projects profoundly influence their success.Strengthening cost control and establishing a scientific financial evaluation system can enhance the project’s...The financial aspects of large-scale engineering construction projects profoundly influence their success.Strengthening cost control and establishing a scientific financial evaluation system can enhance the project’s economic benefits,minimize unnecessary costs,and provide decision-makers with a robust financial foundation.Additionally,implementing an effective cash flow control mechanism and conducting a comprehensive assessment of potential project risks can ensure financial stability and mitigate the risk of fund shortages.Developing a practical and feasible fundraising plan,along with stringent fund management practices,can prevent fund wastage and optimize fund utilization efficiency.These measures not only facilitate smooth project progression and improve project management efficiency but also enhance the project’s economic and social outcomes.展开更多
In order to promote the sustainable development of irrigation work of agricultural water conservancy projects in China, relevant government departments and staff should adhere to the concept of overall planning and re...In order to promote the sustainable development of irrigation work of agricultural water conservancy projects in China, relevant government departments and staff should adhere to the concept of overall planning and reasonable deployment and focus on timely solving and optimizing the problems existing in the irrigation work of agricultural water conservancy projects. On this basis, it actively responds to the call of national sustainable strategic deployment, and utilizes water-saving measures to optimize the irrigation of agricultural water conservancy projects. In view of this, this paper mainly based on the current situation and problems of agricultural water conservancy irrigation, irrigation water-saving measures and technical applications of agricultural water conservancy projects are studied and analyzed.展开更多
Small-scale farmland water conservancy projects are crucial infrastructure for ensuring agricultural production and enhancing water resource utilization efficiency,with their water-saving benefits directly linked to n...Small-scale farmland water conservancy projects are crucial infrastructure for ensuring agricultural production and enhancing water resource utilization efficiency,with their water-saving benefits directly linked to national food security and sustainable agricultural development.This study focuses on small-scale farmland water conservancy projects in China,identifying issues such as aging facilities,outdated technology,and management deficiencies through field research and data analysis.Targeted pathways for enhancing water-saving efficiency are proposed from three dimensions:engineering technology optimization,management mechanism innovation,and policy support.Research indicates that by promoting efficient water-saving technologies,establishing a diversified management model,and improving policy incentive mechanisms,the irrigation water utilization coefficient of small-scale farmland water conservancy projects can be increased by 0.1-0.15,and water consumption per unit area of farmland can be reduced by 15-20%.The findings provide theoretical references and practical guidance for the quality improvement and water-saving enhancement of small-scale farmland water conservancy projects in China.展开更多
A new solution of combination network of GPS and high precise distance measurements with EDM is proposed. Meanwhile, it’s inadvisable only using GPS network without distance measurements. Three schemes: terrestrial n...A new solution of combination network of GPS and high precise distance measurements with EDM is proposed. Meanwhile, it’s inadvisable only using GPS network without distance measurements. Three schemes: terrestrial network, GPS network and combination network are discussed for horizontal control network design of Xiangjiaba Dam in view of precision, reliability, coordinate and outlay in detail.展开更多
The development of agricultural science and technology has been accelerating, which has promoted the scientific and modern development of agricultural planting. In addition, advanced technology can be adopted in plant...The development of agricultural science and technology has been accelerating, which has promoted the scientific and modern development of agricultural planting. In addition, advanced technology can be adopted in planting and maintenance to promote the realization of large-scale agricultural production and help farmers to create higher income. At present, Shandong has stepped up the construction of irrigation and water conservancy projects, the main purpose of which is to adjust water resources to meet the needs of crop growth, but there is still a serious waste of water resources. Shandong Province is internationally recognized as an "extremely water-deficient area", and the water demand for agricultural irrigation is large and waste is serious. Therefore, it is necessary to play the guiding role of the concept of energy conservation and emission reduction, and adopt efficient water-saving irrigation technology to create higher economic benefits and realize the efficient use of water resources. This paper focuses on the application of high-efficiency water-saving irrigation technology in farmland water conservancy projects.展开更多
This paper investigates the wireless communication with a novel architecture of antenna arrays,termed modular extremely large-scale array(XLarray),where array elements of an extremely large number/size are regularly m...This paper investigates the wireless communication with a novel architecture of antenna arrays,termed modular extremely large-scale array(XLarray),where array elements of an extremely large number/size are regularly mounted on a shared platform with both horizontally and vertically interlaced modules.Each module consists of a moderate/flexible number of array elements with the inter-element distance typically in the order of the signal wavelength,while different modules are separated by the relatively large inter-module distance for convenience of practical deployment.By accurately modelling the signal amplitudes and phases,as well as projected apertures across all modular elements,we analyse the near-field signal-to-noise ratio(SNR)performance for modular XL-array communications.Based on the non-uniform spherical wave(NUSW)modelling,the closed-form SNR expression is derived in terms of key system parameters,such as the overall modular array size,distances of adjacent modules along all dimensions,and the user's three-dimensional(3D)location.In addition,with the number of modules in different dimensions increasing infinitely,the asymptotic SNR scaling laws are revealed.Furthermore,we show that our proposed near-field modelling and performance analysis include the results for existing array architectures/modelling as special cases,e.g.,the collocated XL-array architecture,the uniform plane wave(UPW)based far-field modelling,and the modular extremely large-scale uniform linear array(XL-ULA)of onedimension.Extensive simulation results are presented to validate our findings.展开更多
With the continuous development of agriculture, the demand of farmland for water resources is increasing, and the consumption of water resources is gradually increasing. Water saving irrigation technology can effectiv...With the continuous development of agriculture, the demand of farmland for water resources is increasing, and the consumption of water resources is gradually increasing. Water saving irrigation technology can effectively alleviate the demand of agricultural water, and promote the sustainable development of agriculture. In the context of sustainable economic development, China has built a large number of water conservancy projects in order to achieve the purpose of flood control and promote agricultural development. The research and exploration of water-saving irrigation technology and the formulation of more scientific and reasonable water-saving irrigation strategy can lay a good foundation for the healthy, stable and sustainable development of agriculture. This paper discusses the application of water-saving irrigation technology in farmland water conservancy project.展开更多
The anaerobic digestion(AD)disposal of stover and cattle manure is of great significance to the development of low-carbon economy and green energy in China,but it will also have an impact on the environment,and the de...The anaerobic digestion(AD)disposal of stover and cattle manure is of great significance to the development of low-carbon economy and green energy in China,but it will also have an impact on the environment,and the degree of influence is different for various raw materials.In this study,life cycle assessment(LCA)methods were applied to analyze and compare the impact of corn stovers biogas projects(CSBP)and dairy manure biogas projects(DMBP)on the environment during the whole operation stage.The results of inventory analysis were evaluated by ReCiPe2016 Hierarchy(H)mid-point(problem-oriented)and end-point(destruction-oriented)method,respectively.The results showed that the net energy efficiency of CSBP was higher(763.903 kW·h/FU)and the greenhouse gas(GHG)emission reduction of DMBP was more(5541.418 kg CO_(2)-eq/FU).The anaerobic digestion(AD)units have the greatest environmental impacts,and human carcinogenic toxicity is the largest environmental impact category(1.16-1.43 PE).The key to reducing environmental impact is reducing the input of chemical substances and the waste of electric energy.Both CSBP and DMBP have a favorable impact on ecosystem quality and resources,and CSBP is more beneficial to the environment(-10.297 Pt).Co-digestion is an important measure to reduce the environmental damage from biogas projects.These research results provide theoretical support for the selection of raw materials for large-scale biogas projects in China,provide technical basis for reducing the impact of actual operation on the environment,and promote the resource utilization of agricultural waste and carbon dioxide emission reduction and sequestration.展开更多
To keep up with the time,culture is integrated to large-scale construction project management in China,which will absolutely add more vitality into construction project management in our country.Engineering culture is...To keep up with the time,culture is integrated to large-scale construction project management in China,which will absolutely add more vitality into construction project management in our country.Engineering culture is an integration of project construction and engineering culture.However,engineering culture development enjoys its own particularity as a project is constructed once only within a limited period of time.This paper gives affirmative opinion that engineering culture development in large-scale projects backs project management on the basis of thorough investigation of engineering culture development in Sutong Bridge Project and after deepened analysis,proposes new thinking pattern of engineering culture development in large-scale projects in a systematic manner,including thorough understanding of the essence of engineering culture,principle and contents of engineering culture development as well as efficient method in respect of establishment and implementation of engineering culture,and therefore provides a standard reference and systematic thinking pattern for engineering culture development in future large-scale projects.展开更多
With the development of social economy, the total energy consumption in our country has been increasing. As an important part of social production and life, agriculture's dependence on water resources has become i...With the development of social economy, the total energy consumption in our country has been increasing. As an important part of social production and life, agriculture's dependence on water resources has become increasingly prominent. But in fact, China's total water resources reserve and its distribution are not optimistic. The lack or unreasonable use of water resources in some areas hinders the development of agriculture. In order to solve this problem and realize the balanced regulation of water resources, it is necessary to construct scientific irrigation and water conservancy projects. Through irrigation and water conservancy projects, the allocation and use of water resources can be further optimized to provide stable water resources guarantee for agricultural development. This article will be based on this issue. The development and application of irrigation and water conservancy projects in agriculture are analyzed in depth to provide reference for the development of agriculture in China.展开更多
West Route of South-North Water Transfer Project,situated in southeastern Qinghai-Tibet Plateau,is a giant project,which will deliver 17 billion m3 of water from the main stream and tributaries upstream of the Yangtze...West Route of South-North Water Transfer Project,situated in southeastern Qinghai-Tibet Plateau,is a giant project,which will deliver 17 billion m3 of water from the main stream and tributaries upstream of the Yangtze River to the upper reaches of the Yellow River. It is to be constructed in 3 stages, of which the 1st stage project includes delivering 4 billion m3 of water by gravity from two tributaries of Yalong River and three tributaries of Dadu River. The project consists of 5 dams,7 tunnels and a channel in series,with the dam height of 63～123 m and water transfer length of 260.3 km,of which the tunnels measure 244.1 km. The special climatic,environmental and geologic conditions make the project much more complicated in construction,especially 3 tunnels with the length longer than 50 km each create challenges to the technical requirements of engineering survey,design and construction.展开更多
Inspired by the success of the projected Barzilai-Borwein (PBB) method for largescale box-constrained quadratic programming, we propose and analyze the monotone projected gradient methods in this paper. We show by exp...Inspired by the success of the projected Barzilai-Borwein (PBB) method for largescale box-constrained quadratic programming, we propose and analyze the monotone projected gradient methods in this paper. We show by experiments and analyses that for the new methods,it is generally a bad option to compute steplengths based on the negative gradients. Thus in our algorithms, some continuous or discontinuous projected gradients are used instead to compute the steplengths. Numerical experiments on a wide variety of test problems are presented, indicating that the new methods usually outperform the PBB method.展开更多
文摘The smallholder irrigation sector in Kenya is considered inadequately developed. The study views unawareness of critical success factors in the smallholder irrigation sector as contributing to poor performance of smallholder irrigation projects. Consequently, the study investigated influence of farmer capacity building in institutional linkages on performance of smallholder irrigation projects in Migori County, Kenya. The study embraced a pragmatic view of philosophy, and used cross sectional and correlation research design. The target population was 2815, and comprised farmers drawn from fifteen smallholder irrigation projects that receive water from River Kuja through Lower Kuja Project. The sample size was 341. The study used systematic random sampling procedure to draw the sample, and collected data using questionnaire. Data was analysed using descriptive and inferential statistics. The study established that farmer capacity building in institutional linkages has a significant influence on performance of smallholder irrigation projects (r = 0.803, R<sup>2</sup> = 0.645, F (5, 331) = 120.254 and p < 0.000 < 0.05). Thus, the study recommends that Migori County Government come up with policies that link smallholder irrigation projects in Lower Kuja Project to institutions that provide land ploughing services, certified seeds and fertilisers, control of crop pests and diseases, transportation of farm produce and marketing of farm produce.
文摘The irrigation and water conservancy project provides the basic guarantee for the rural agricultural economic development, and requires greater function and effect in water supply, drainage, waterlogging, drought prevention, irrigation and other farmland services. However, there are still some problems in the management of farmland water conservancy project, such as imperfect system, unclear responsibility and inactive subject, which hinder the development of farmland water conservancy project to a certain extent. In the context of building a new countryside, the management of irrigation and water conservancy projects should implement and Xi Jining New Era Socialism with Chinese Characteristics, adhere to the concept of scientific development, focus on the overall situation, seek benefits from management, and promote the high-quality development of project management.
文摘The financial aspects of large-scale engineering construction projects profoundly influence their success.Strengthening cost control and establishing a scientific financial evaluation system can enhance the project’s economic benefits,minimize unnecessary costs,and provide decision-makers with a robust financial foundation.Additionally,implementing an effective cash flow control mechanism and conducting a comprehensive assessment of potential project risks can ensure financial stability and mitigate the risk of fund shortages.Developing a practical and feasible fundraising plan,along with stringent fund management practices,can prevent fund wastage and optimize fund utilization efficiency.These measures not only facilitate smooth project progression and improve project management efficiency but also enhance the project’s economic and social outcomes.
文摘In order to promote the sustainable development of irrigation work of agricultural water conservancy projects in China, relevant government departments and staff should adhere to the concept of overall planning and reasonable deployment and focus on timely solving and optimizing the problems existing in the irrigation work of agricultural water conservancy projects. On this basis, it actively responds to the call of national sustainable strategic deployment, and utilizes water-saving measures to optimize the irrigation of agricultural water conservancy projects. In view of this, this paper mainly based on the current situation and problems of agricultural water conservancy irrigation, irrigation water-saving measures and technical applications of agricultural water conservancy projects are studied and analyzed.
文摘Small-scale farmland water conservancy projects are crucial infrastructure for ensuring agricultural production and enhancing water resource utilization efficiency,with their water-saving benefits directly linked to national food security and sustainable agricultural development.This study focuses on small-scale farmland water conservancy projects in China,identifying issues such as aging facilities,outdated technology,and management deficiencies through field research and data analysis.Targeted pathways for enhancing water-saving efficiency are proposed from three dimensions:engineering technology optimization,management mechanism innovation,and policy support.Research indicates that by promoting efficient water-saving technologies,establishing a diversified management model,and improving policy incentive mechanisms,the irrigation water utilization coefficient of small-scale farmland water conservancy projects can be increased by 0.1-0.15,and water consumption per unit area of farmland can be reduced by 15-20%.The findings provide theoretical references and practical guidance for the quality improvement and water-saving enhancement of small-scale farmland water conservancy projects in China.
基金Supported bythe National 973 Programof China(No.2003CB716705) International Cooperative Fund of European Union(No.EVGI-CT-2002-00061) .
文摘A new solution of combination network of GPS and high precise distance measurements with EDM is proposed. Meanwhile, it’s inadvisable only using GPS network without distance measurements. Three schemes: terrestrial network, GPS network and combination network are discussed for horizontal control network design of Xiangjiaba Dam in view of precision, reliability, coordinate and outlay in detail.
文摘The development of agricultural science and technology has been accelerating, which has promoted the scientific and modern development of agricultural planting. In addition, advanced technology can be adopted in planting and maintenance to promote the realization of large-scale agricultural production and help farmers to create higher income. At present, Shandong has stepped up the construction of irrigation and water conservancy projects, the main purpose of which is to adjust water resources to meet the needs of crop growth, but there is still a serious waste of water resources. Shandong Province is internationally recognized as an "extremely water-deficient area", and the water demand for agricultural irrigation is large and waste is serious. Therefore, it is necessary to play the guiding role of the concept of energy conservation and emission reduction, and adopt efficient water-saving irrigation technology to create higher economic benefits and realize the efficient use of water resources. This paper focuses on the application of high-efficiency water-saving irrigation technology in farmland water conservancy projects.
基金supported by the National Key R&D Program of China with Grant number 2019YFB1803400the National Natural Science Foundation of China under Grant number 62071114the Fundamental Research Funds for the Central Universities of China under grant numbers 3204002004A2 and 2242022k30005。
文摘This paper investigates the wireless communication with a novel architecture of antenna arrays,termed modular extremely large-scale array(XLarray),where array elements of an extremely large number/size are regularly mounted on a shared platform with both horizontally and vertically interlaced modules.Each module consists of a moderate/flexible number of array elements with the inter-element distance typically in the order of the signal wavelength,while different modules are separated by the relatively large inter-module distance for convenience of practical deployment.By accurately modelling the signal amplitudes and phases,as well as projected apertures across all modular elements,we analyse the near-field signal-to-noise ratio(SNR)performance for modular XL-array communications.Based on the non-uniform spherical wave(NUSW)modelling,the closed-form SNR expression is derived in terms of key system parameters,such as the overall modular array size,distances of adjacent modules along all dimensions,and the user's three-dimensional(3D)location.In addition,with the number of modules in different dimensions increasing infinitely,the asymptotic SNR scaling laws are revealed.Furthermore,we show that our proposed near-field modelling and performance analysis include the results for existing array architectures/modelling as special cases,e.g.,the collocated XL-array architecture,the uniform plane wave(UPW)based far-field modelling,and the modular extremely large-scale uniform linear array(XL-ULA)of onedimension.Extensive simulation results are presented to validate our findings.
文摘With the continuous development of agriculture, the demand of farmland for water resources is increasing, and the consumption of water resources is gradually increasing. Water saving irrigation technology can effectively alleviate the demand of agricultural water, and promote the sustainable development of agriculture. In the context of sustainable economic development, China has built a large number of water conservancy projects in order to achieve the purpose of flood control and promote agricultural development. The research and exploration of water-saving irrigation technology and the formulation of more scientific and reasonable water-saving irrigation strategy can lay a good foundation for the healthy, stable and sustainable development of agriculture. This paper discusses the application of water-saving irrigation technology in farmland water conservancy project.
基金supported by the National Key Research and Development Program of China(Grant No.2023YFE0106000)the National Natural Science Foundation of China(Grant No.52206234).
文摘The anaerobic digestion(AD)disposal of stover and cattle manure is of great significance to the development of low-carbon economy and green energy in China,but it will also have an impact on the environment,and the degree of influence is different for various raw materials.In this study,life cycle assessment(LCA)methods were applied to analyze and compare the impact of corn stovers biogas projects(CSBP)and dairy manure biogas projects(DMBP)on the environment during the whole operation stage.The results of inventory analysis were evaluated by ReCiPe2016 Hierarchy(H)mid-point(problem-oriented)and end-point(destruction-oriented)method,respectively.The results showed that the net energy efficiency of CSBP was higher(763.903 kW·h/FU)and the greenhouse gas(GHG)emission reduction of DMBP was more(5541.418 kg CO_(2)-eq/FU).The anaerobic digestion(AD)units have the greatest environmental impacts,and human carcinogenic toxicity is the largest environmental impact category(1.16-1.43 PE).The key to reducing environmental impact is reducing the input of chemical substances and the waste of electric energy.Both CSBP and DMBP have a favorable impact on ecosystem quality and resources,and CSBP is more beneficial to the environment(-10.297 Pt).Co-digestion is an important measure to reduce the environmental damage from biogas projects.These research results provide theoretical support for the selection of raw materials for large-scale biogas projects in China,provide technical basis for reducing the impact of actual operation on the environment,and promote the resource utilization of agricultural waste and carbon dioxide emission reduction and sequestration.
基金National Science and Technology Support Program(No.2006BAG04B06)
文摘To keep up with the time,culture is integrated to large-scale construction project management in China,which will absolutely add more vitality into construction project management in our country.Engineering culture is an integration of project construction and engineering culture.However,engineering culture development enjoys its own particularity as a project is constructed once only within a limited period of time.This paper gives affirmative opinion that engineering culture development in large-scale projects backs project management on the basis of thorough investigation of engineering culture development in Sutong Bridge Project and after deepened analysis,proposes new thinking pattern of engineering culture development in large-scale projects in a systematic manner,including thorough understanding of the essence of engineering culture,principle and contents of engineering culture development as well as efficient method in respect of establishment and implementation of engineering culture,and therefore provides a standard reference and systematic thinking pattern for engineering culture development in future large-scale projects.
文摘With the development of social economy, the total energy consumption in our country has been increasing. As an important part of social production and life, agriculture's dependence on water resources has become increasingly prominent. But in fact, China's total water resources reserve and its distribution are not optimistic. The lack or unreasonable use of water resources in some areas hinders the development of agriculture. In order to solve this problem and realize the balanced regulation of water resources, it is necessary to construct scientific irrigation and water conservancy projects. Through irrigation and water conservancy projects, the allocation and use of water resources can be further optimized to provide stable water resources guarantee for agricultural development. This article will be based on this issue. The development and application of irrigation and water conservancy projects in agriculture are analyzed in depth to provide reference for the development of agriculture in China.
文摘West Route of South-North Water Transfer Project,situated in southeastern Qinghai-Tibet Plateau,is a giant project,which will deliver 17 billion m3 of water from the main stream and tributaries upstream of the Yangtze River to the upper reaches of the Yellow River. It is to be constructed in 3 stages, of which the 1st stage project includes delivering 4 billion m3 of water by gravity from two tributaries of Yalong River and three tributaries of Dadu River. The project consists of 5 dams,7 tunnels and a channel in series,with the dam height of 63～123 m and water transfer length of 260.3 km,of which the tunnels measure 244.1 km. The special climatic,environmental and geologic conditions make the project much more complicated in construction,especially 3 tunnels with the length longer than 50 km each create challenges to the technical requirements of engineering survey,design and construction.
基金supported by the National Natural Science Foundation of China(Grant Nos.10171104,10571171&40233029).
文摘Inspired by the success of the projected Barzilai-Borwein (PBB) method for largescale box-constrained quadratic programming, we propose and analyze the monotone projected gradient methods in this paper. We show by experiments and analyses that for the new methods,it is generally a bad option to compute steplengths based on the negative gradients. Thus in our algorithms, some continuous or discontinuous projected gradients are used instead to compute the steplengths. Numerical experiments on a wide variety of test problems are presented, indicating that the new methods usually outperform the PBB method.
