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
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
No. Name of Project Cooperative Estimated Foreign Invest- Chinese Partner Form Investment ment(USD) (USD)Machine-Building Industry1 Joint production of J.V 2.94 M Shijiazhuang Boiler Works high performance low polluti...No. Name of Project Cooperative Estimated Foreign Invest- Chinese Partner Form Investment ment(USD) (USD)Machine-Building Industry1 Joint production of J.V 2.94 M Shijiazhuang Boiler Works high performance low pollution circulating fluidized bed boiler2 High-voltage insulator J.V 9M 6M Shijiazhuang Electric production line Ceramic Factory3 Enlargement of pro- J.V 18 M 8 M Shijiazhuang Building duction capacity of Machinery Factory air cooled展开更多
Peking Union Medical College(PUMC),as the representative work of Chinese modern architecture,has had a great impact on the development of Chinese modern architecture.Its advanced and complete concealed works contain g...Peking Union Medical College(PUMC),as the representative work of Chinese modern architecture,has had a great impact on the development of Chinese modern architecture.Its advanced and complete concealed works contain great value and are valuable materials for the study of Chinese modern architecture.This paper studies the concealed works of PUMC,enriches the research data in this field,and summarizes the transformation design scheme of concealed works in the protection and repair of ancient buildings of PUMC.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
Shantytown renovation is a livelihood project initiated by the Chinese government to reconstruct urban dilapidated housing and improve housing conditions for families in need. Since the funding problem is a major obst...Shantytown renovation is a livelihood project initiated by the Chinese government to reconstruct urban dilapidated housing and improve housing conditions for families in need. Since the funding problem is a major obstacle in the course of shantytown renovation, the government actively advocates the adoption of the public-private partnership(PPP) model. In view of the particularity of shantytown renovation and the complexity of the PPP model operation procedures, it is considered that the risk management of shantytown renovation based on the PPP model. This paper identified and judged the main risks of the PPP project in shantytown renovation, and put forward corresponding suggestions for the risk management of the PPP project in shantytown renovation, hoping to provide a reference for government decision-making.展开更多
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.
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No. Name of Project Cooperative Estimated Foreign Invest- Chinese Partner Form Investment ment(USD) (USD)Machine-Building Industry1 Joint production of J.V 2.94 M Shijiazhuang Boiler Works high performance low pollution circulating fluidized bed boiler2 High-voltage insulator J.V 9M 6M Shijiazhuang Electric production line Ceramic Factory3 Enlargement of pro- J.V 18 M 8 M Shijiazhuang Building duction capacity of Machinery Factory air cooled
文摘Peking Union Medical College(PUMC),as the representative work of Chinese modern architecture,has had a great impact on the development of Chinese modern architecture.Its advanced and complete concealed works contain great value and are valuable materials for the study of Chinese modern architecture.This paper studies the concealed works of PUMC,enriches the research data in this field,and summarizes the transformation design scheme of concealed works in the protection and repair of ancient buildings of PUMC.
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.
文摘Shantytown renovation is a livelihood project initiated by the Chinese government to reconstruct urban dilapidated housing and improve housing conditions for families in need. Since the funding problem is a major obstacle in the course of shantytown renovation, the government actively advocates the adoption of the public-private partnership(PPP) model. In view of the particularity of shantytown renovation and the complexity of the PPP model operation procedures, it is considered that the risk management of shantytown renovation based on the PPP model. This paper identified and judged the main risks of the PPP project in shantytown renovation, and put forward corresponding suggestions for the risk management of the PPP project in shantytown renovation, hoping to provide a reference for government decision-making.
