The research conducted investigation and survey on 186 farm households in 2014 and carried out economic evaluation on ＂planting three to produce four＂ highyielding project of super hybrid rice. The results showed th...The research conducted investigation and survey on 186 farm households in 2014 and carried out economic evaluation on ＂planting three to produce four＂ highyielding project of super hybrid rice. The results showed that the project of ＂planting three to produce four＂ performed significantly in terms of increasing yields and incomes. For example, per unit area yield of one-season late hybrid rice and middleseason hybrid rice proved the highest, and net income from middle-season rice in Longhui was the highest. It is obvious that to increase per unit yield is key for improving net incomes and to reduce machine fees and worker fees is crucial for decreasing fees.展开更多
Because forecasting a development program during the target selection phase of exploration for coalbed methane （CBM） is impossible, the conventional method that relies on a conceptual （or detailed） development pro...Because forecasting a development program during the target selection phase of exploration for coalbed methane （CBM） is impossible, the conventional method that relies on a conceptual （or detailed） development pro- gram cannot be used during the economic evaluation of CBM resources. Hence, this study focuses on establishing an economic evaluation model based on the characteristics of the target selection phase. The discounted cashflow method is applied to the construction of the model with the assumption that there is a uniform distribution of produc- tion wells. The computational error generated by the assumption is corrected by introducing a correction factor based on the production profile of single CBM wells. The case study demonstrates that the blocks lacking economic value can be screened out, and the most advantageous targets can be found by computing the resource values in the best- and worst-case scenarios. This technique can help to reduce wasted investments and improve the quality of decision-making in selecting targets for exploration.展开更多
Objective:This study evaluated the feasibility of different cervical cancer screening strategies in urban China.Methods:A Markov model was constructed to simulate a hypothetical cohort of 100,000 females aged 30-59 ye...Objective:This study evaluated the feasibility of different cervical cancer screening strategies in urban China.Methods:A Markov model was constructed to simulate a hypothetical cohort of 100,000 females aged 30-59 years in a 20-year period.Screening strategies included liquid-based cytology(LBC)every three years,human papillomavirus(HPV)DNA testing every three and five years,respectively,and a combination of HPV DNA testing and LBC(HPV+LBC)every three and five years,respectively.Model outcomes included cumulative incidence over 20 years,cumulative risk of cervical cancer,costs,life year saved(LYS),quality-adjusted life years(QALYs)and benefits.The cost-effectiveness ratios(CERs),incremental cost-effectiveness ratios(ICERs),costutility ratios(CURs),and benefit-cost ratios(BCRs)were used as outcomes in the health economic evaluation analysis.Univariate sensitivity analyses were performed to examine the stability of the results.Results:The cumulative incidence of the five screening strategies ranged from 833.02 to 1,158.07 cases per100,000 females.HPV DNA testing was most effective in reducing the cumulative risk of cervical cancer,saving life years and QALYs and gaining benefits.The CERs of HPV DNA testing every three and five years,and LBC every three years were considered to be very cost-effective if they were below China's GDP per capita.The CERs of HPV+LBC were considered to be cost-effective if they were below three times GDP per capita.The incremental cost-effectiveness analysis showed that HPV DNA testing every three and five years,LBC every three years and HPV+LBC every five years were dominant strategies.Conclusions:The findings of this study indicated that HPV DNA testing every five years or LBC every three years should be recommended in urban China.展开更多
OBJECTIVE:To analyze the cost effect of surrounding acupuncture plus electric acupuncture,cotton-sheet moxibustion,puncturing with red-hot needles,tapping plus cupping on herpes zoster.METHODS:Five hundred patients wi...OBJECTIVE:To analyze the cost effect of surrounding acupuncture plus electric acupuncture,cotton-sheet moxibustion,puncturing with red-hot needles,tapping plus cupping on herpes zoster.METHODS:Five hundred patients with herpes zoster were randomly divided into group A(surrounding acupuncture plus electric acupuncture),group B(cotton-sheet moxibustion),group C(puncturing with red-hot needles),group D(tapping plus cupping),and group E(Western medicine).The treatment was carried out twice a day in group E and once a day in the other four groups.The curative effect was observed on the 10th day of treatment;the cost was calculated for the five therapies,and the cost-effect ratio(C/E) and increment ratio(△ C/△ E) were analyzed.RESULTS:After the 10-day treatment,there was no statistical difference(P>0.05) in the curative effect among the five groups.Pain being alleviated one day faster than in group E amounted to a saving of RMB 21.90 yuan in group A,a saving of RMB 21.87 yuan in group B,a saving of RMB 26.00 yuan in group C,and a saving of RMB 20.23 yuan in group D.Compared with group C,the values of △ C/△ E were RMB 1.55,2.81,and 0.21 yuan in groups A,B,and D,respectively.CONCLUSIONS:The curative effect in groups A,B,C,and D was similar to that in group E,but the C/E was better than in group E.展开更多
Gastric cancer is a global public health burden, nearly one million new cases are diagnosed per year worldwide, of which 44% of cases occur in China. The prognosis of gastric cancer varies remarkably by the stage of c...Gastric cancer is a global public health burden, nearly one million new cases are diagnosed per year worldwide, of which 44% of cases occur in China. The prognosis of gastric cancer varies remarkably by the stage of cancer, and most of the patients in China are diagnosed at advanced stages, resulting in poor prognoses. Effective strategies to reduce the burden of gastric cancer include primary prevention through testing and treatment of Helicobacter pylori(H. pylori) and secondary prevention by screening and early detection. Although many countries have issued management guidelines and consensus reports concerning these strategies, the limited availability of healthcare resources often precludes their widespread implementation. Therefore, assessing the costs, benefits, and harms of population-based intervention measures through health economic evaluation is necessary for informed health policy decisions. Accordingly, we synthesize management approaches from different countries on H. pylori eradication and endoscopic screening, and also summarize recent advancements in health economic evaluations on population-based preventive strategies. The goal of the review is to provide empirical evidence supporting optimal resource allocation, maximizing benefits for the population, and ultimately reducing the burden of gastric cancer.展开更多
The environment impact of the coal resources mining was analyzed. The method of economic evaluation for the coal mining was established to analyze land destruction. The opportunity cost method was used to quantitative...The environment impact of the coal resources mining was analyzed. The method of economic evaluation for the coal mining was established to analyze land destruction. The opportunity cost method was used to quantitatively analyze and estimate the economic loss of the land destruction by coal mining. At the same time, the dump land reclamation of the Yuanbaoshan Open Pit was taken as an example to evaluate environmental and economical benefit with the method of economic evaluation for the coal mining areas land reclamation.展开更多
The publication of ISO 15686-5 is significant for studies related to the life-cycle costs of buildings. Among the many economic evaluation methods, the NPV method is recommended for use by this standard. This stu...The publication of ISO 15686-5 is significant for studies related to the life-cycle costs of buildings. Among the many economic evaluation methods, the NPV method is recommended for use by this standard. This study explains the concept and method of PV, and then provides an explanation of the concept and method of NPV, and points out the limitations in the practical application of the method.展开更多
Hydraulic fracturing is among the approaches used to optimize production from a gas condensate reservoir. A detailed economic analysis is required to evaluate the profitability and feasibility of hydraulic fracturing ...Hydraulic fracturing is among the approaches used to optimize production from a gas condensate reservoir. A detailed economic analysis is required to evaluate the profitability and feasibility of hydraulic fracturing as an optimization option in a gas condensate reservoir operating below dewpoint. The objective of this research is to evaluate the economic benefits derivable from the use of hydraulic fracturing to improve gas and liquid recovery from a gas condensate reservoir operating below dewpoint. This research considers the use of four profit indicators to ascertain the profitability of hydraulic fracturing in a gas condensate reservoir operating below dewpoint by increasing the fracture halflength, fracture width and fracture permeability. The production data of the reservoir was obtained and the economic calculations done on excel spreadsheet and plots generated. The four profit indicators considered in the research are Net Present Value, Payout, Discounted Cash Flow Rate of Return and Profit per Dollar Invested. The economic justification was done by carrying out a comparative economic analysis from the result obtained when the reservoir of study was unfractured with that obtained when the reservoir was fractured at various fracture parameters. The economic analysis was done considering a royalty and tax rate of 18.5% and 30% respectively and a gas price of $2/MSCF and condensate price of $30/bbl. This is done so as to find out if the additional cost of hydraulic fracturing can be offset by the recovery from the reservoir when its pressure declined below dewpoint. The result obtained showed that the additional recovery due to hydraulic fracturing by increasing the fracture halflength, fracture width and fracture permeability was not enough to justify the application of hydraulic fracturing when the reservoir pressure declined below dewpoint.展开更多
China is rich in tight sandstone gas resources(“tight gas”for short).For example,the Sulige Gasfield in the Ordos Basin and the Upper Triassic Xujiahe Fm gas reservoir in the Sichuan Basin are typical tight gas rese...China is rich in tight sandstone gas resources(“tight gas”for short).For example,the Sulige Gasfield in the Ordos Basin and the Upper Triassic Xujiahe Fm gas reservoir in the Sichuan Basin are typical tight gas reservoirs.In the past decade,tight gas reserve and production both have increased rapidly in China,but tight gas reservoirs are always managed as conventional gas reservoirs without effective fiscal,taxation and policy supports.The potential of sustainable tight gas production increase is obviously restricted.The tight gas development projects represented by the Sulige Gasfield have failed to make profit for a long period,and especially tight gas production has presented a slight decline since 2015.In this paper,a new economic evaluation method was proposed for tight gas development projects.The new method was designed to verify the key parameters(e.g.production decline rate and single-well economic service life)depending on tight gas development and production characteristics,and perform the depreciation by using the production method.Furthermore,the possibility that the operation cost may rise due to pressure-boosting production and intermittent opening of gas wells is considered.The method was used for the tight gas development project of Sulige Gasfield,showing that its profit level is much lower than the enterprise's cost level of capital.In order to support a sustainable development of tight gas industry in China,it is recommended that relevant authorities issue value-added tax(VAT)refund policy as soon as possible.It is necessary to restore the non-resident gas gate price of the provinces where tight gas is produced to the fair and reasonable level in addition to the fiscal subsidy of CNY0.24/m^(3),or offer the fiscal subsidy of CNY0.32/m^(3) directly based on the on-going gate price.With these support policies,tax income is expected to rise directly,fiscal expenditure will not increase,and gas consumption cost in China will be significantly cut down.展开更多
Objective To evaluate the economy of detecting gastric cancer by electronic gastroscope in Chinese natural population of different ages and genders.Methods A Markov model was constructed for the population,including b...Objective To evaluate the economy of detecting gastric cancer by electronic gastroscope in Chinese natural population of different ages and genders.Methods A Markov model was constructed for the population,including both men and women of different ages.The model cycle was one year and the simulation time was 60 years.The cost-effectiveness of electronic gastroscopy in detecting gastric cancer of general population in China was analyzed from the perspective of the whole society,and the stability of the results was verified by sensitivity analysis.Results and Conclusion For the general population,the incremental cost-effectiveness ratio(ICER)of gastric cancer screening from the age of 50 is 50143 yuan/QALY(quality-adjusted life-year),which is less than two times of per capita gross domestic product(GDP)compared with the screening from the age of 55.For men who start gastric cancer screening at the age of 50,the ICER is 38525 yuan/QALY,which is less than two times of per capita GDP,and it is economical.For women who start the screening from the age of 55,the ICER is 47814 yuan/QALY,which is less than two times of per capita GDP,so it is economical.The results of sensitivity analysis are consistent with the conclusions of basic analysis,and the results of basic analysis are stable.For the general population,it is more economical to start gastric cancer screening from the age of 50,while for men and women,it is more economical to start gastric cancer screening from the age of 50 and 55,respectively.展开更多
Taking the economic evaluation of a highway with international bank loan in Guangxi mountainous and hilly areas as an example, this paper summarizes the characteristics of economic evaluation of international bank loa...Taking the economic evaluation of a highway with international bank loan in Guangxi mountainous and hilly areas as an example, this paper summarizes the characteristics of economic evaluation of international bank loan highway projects, and puts forward the economic evaluation model of international bank loan highway projects, which can provide reference for other international loan highway construction projects.展开更多
At this stage, China is vigorously promoting the reform of the supply-side structure to promote the transformation and upgrading of the economy. In this process, the project investment decision of the enterprise plays...At this stage, China is vigorously promoting the reform of the supply-side structure to promote the transformation and upgrading of the economy. In this process, the project investment decision of the enterprise plays a very important role, which affects the development of the enterprise. It is necessary to apply the financial and economic evaluation method in a timely manner to identify the risks in the project investment decision and improve the safety of the enterprise development. Based on this, this paper analyzes the financial and economic evaluation method from three aspects of connotation, significance and classification, clarifies the analysis that should be paid attention to in the application process of this method, and explains the specific application, in order to provide reference for the follow-up research in this field.展开更多
Objective To systematically evaluate the overall characteristics and quality of literature on economic evaluation of drugs for type 2 diabetes,and to provide recommendations for future research and related decision-ma...Objective To systematically evaluate the overall characteristics and quality of literature on economic evaluation of drugs for type 2 diabetes,and to provide recommendations for future research and related decision-making.Methods The economic evaluation literature on drugs for type 2 diabetes based on the Chinese population were searched from CNKI,Wanfang,VIP and PubMed databases.The literature that met the inclusion criteria was selected,and the key research elements were extracted.Meanwhile,the quality of health economics studies(QHES)was used to evaluate the quality of the literature.Results and Conclusion A total of 325 articles(296 in Chinese and 29 in English)were included.Most of the studies were conducted by medical institutions(247 articles,76.0%)and they used cost-effectiveness analysis(295 articles,90.8%).However,most of the included literature did not report study perspective(267 articles,90.2%).The average QHES score of the included literature was 57.29,and the quality of the literature was concentrated in“low quality”(123 articles,37.8%)and“average quality”(138 articles,42.5%).Literature published in English journals,or using modeling methods,or from universities had relatively higher quality.The quality of economic evaluation literature on drugs for type 2 diabetes based on the Chinese population is generally low at present.There are many problems,such as single research institutions and methods,lack of research perspectives,and no sensitivity analysis.展开更多
With the rapid development of computer networks,digitization has become a new symbol of today's social and economic development.The"digitalization"of mining exploration and mining results data is one of ...With the rapid development of computer networks,digitization has become a new symbol of today's social and economic development.The"digitalization"of mining exploration and mining results data is one of the essential contents of current mining work.This article will use the large-scale mine engineering software Surpac Vision to construct a digital ore deposit model of the Manjiazhai section and realize the three-dimensional visualization of the ore body.It intuitively reflects the spatial continuity,thickness variation,resource reserves,and grade spatial distribution of ore bodies.On this basis,a block model is established.In calculating the valuation of the unit block,a computer is used to dynamically analyze the changes of ore bodies with different boundary grades and the changes of ore bodies'shape and average grade under single elements and combined elements.Comparative analysis shows that the ore bodies with comprehensive grade delimits have good continuity under the same boundary grade.The average grade and metal content are higher than the single-grade circled ore body,indicating that improving the comprehensive utilization of resources will be conducive to improving the service life of the mine and increasing the overall economic benefits of the mine,suggesting that it is adequate to apply the digital deposit model to the comprehensive utilization of mineral resources,which will provide data support for the green and sustainable development of mining enterprises.展开更多
The rice-duck ecological system is one of the major practices of the traditional Chinese agriculture. A study on the effect of reducing methane emission using this practice provided theoretical and practical basis for...The rice-duck ecological system is one of the major practices of the traditional Chinese agriculture. A study on the effect of reducing methane emission using this practice provided theoretical and practical basis for further development and utilization of this classical agricultural technique. The effect of reducing methane emission and the economic benefits of rice-duck ecological system were studied by carrying out a field experiment and by using economic methodology. The daily variation of CH4 emission in late rice paddy field was basically consistent with the daily variation of atmospheric temperature. The highest emission occurred at the full tillering stage of late rice with a rate of 24.1 or 32.2 or 40.5 mg m^-2 h^-1 in no-tillage area with duck and no-tillage area without duck and conventional-tillage area without duck, respectively. The inhibition of methane emission was apparently effective in the rice-duck ecological system during the initial tillering stage and the full tillering stage. Compared to the no-tillage area without duck, methane emission decreased by 2.333 g m^-2. Compared to the conventional-tillage area without duck, methane emission decreased by 4.723 g m^-2. During the production period of late rice, the amount of methane emission in no-tillage area with duck was 3.373 g m^-2 lesser than that of no-tillage area without duck, and 5.59 g m^-2 less than that of conventional-tillage without duck area. The economic significance was analyzed. Farmers adopting the rice-duck ecological system obtained 2 166 and 4 207 RMB yuan ha^-1 more income than those who adopted a no-tillage without duck technique or conventional-tillage without duck technique, respectively. In addition to the reduction of the environmental pollution by methane emission, the farmers who adopted the rice-duck ecological system achieved economic benefits of 5 000 RMB yuan ha^-1, which was 2 206 and 4 274 RMB yuan ha^-1 more than those who adopted a no-tillage without duck technique and a conventional-tillage without duck technique, respectively. The rice-duck ecological system not only increased the economic benefits for farmers, but also reduced methane emission in rice paddy field. A sustainable agricultural production mode was formed.展开更多
Seven kinds of used mineral lubricating oils,including hydraulic oils,film bearing oils,steam turbine oil and gear oils,were recycled by reclamation and adding additives.Physical and chemical properties of the recycle...Seven kinds of used mineral lubricating oils,including hydraulic oils,film bearing oils,steam turbine oil and gear oils,were recycled by reclamation and adding additives.Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers.Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope.The recycling costs of burning,re-refined and refortified were estimated.Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard.With the different friction materials under different loads,refortified oils provided excellent lubrication performances,much better than those of fresh oils.Because of additives replenished,the different lubrication films could form on the worn surfaces.A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods.展开更多
An increasing number of U.S.apple growers are now interested in using harvest platforms to increase harvest productivity,expand labor pool,and alleviate tough working conditions.To maximize benefits,functions of thinn...An increasing number of U.S.apple growers are now interested in using harvest platforms to increase harvest productivity,expand labor pool,and alleviate tough working conditions.To maximize benefits,functions of thinning,pruning&training,and infield sorting have been or are to be incorporated into harvest platforms.Though growers are most concerned with economic benefits,few cost-benefit studies had been conducted on different platforms.In the meantime,economic analysis procedure is complex and each analysis is for one specific machine(not for general purposes).No software has been developed as a general and ready-to-use tool for growers and researchers for the platform economic analysis.In this study,platforms,both available on the marketplace and developed in lab as pilot trials,were reviewed.Costs and benefits models were then established,based on which multi-purpose apple harvest platform economic evaluation software(iMPAHP)was developed(capable of evaluating a wide variety of apple harvest platforms).A case study(machine cost of$100000,accommodating 6 workers,processing apple incidence of 10%with 90%sort-out rate,and harvest,thinning,and pruning&training productivity increase by 40%,50%,and 60%,respectively)based on iMPAHP demonstrated that infield sorting,harvest,thinning,and pruning and training accounted for 48.4%,23.9%,14.3%,and 13.4%of the total benefits,respectively.In the case that the platform was in all-four-purpose-application,the net present value(NPV)analysis of a 10-year investment showed a positive return of$60547.However,without infield sorting function,the NPV resulted in a negative value,indicating a loss for the machine investment.Though incorporating the modular infield sorting system certainly increased the overall machine investment by$30000,the benefits outweighed the costs.展开更多
The rapid development of communication services in the power distribution network poses challenges for existing wireless communications,and the deployment of a fiber optic network is costly and difficult.The emerging ...The rapid development of communication services in the power distribution network poses challenges for existing wireless communications,and the deployment of a fiber optic network is costly and difficult.The emerging 5G technology has been piloted in power distribution networks,though the cost-effectiveness of its large-scale deployment remains unclear.This paper proposes an economic evaluation method for 5G planning in power distribution networks,considering the coupling relationship between power distribution and communication networks and the identification of important network nodes.First,the objective function to solve the planned number of 5G base stations is established.This is solved using the adaptive particle swarm algorithm and K-means algorithm.Second,the coupling relationship between the distribution and communication networks is discussed and quantified.The node importance of the coupling network is analyzed to identify the important nodes,and micro base stations or optical fibers are added to improve the reliability of the distribution network at the communication level.Finally,an economic evaluation index of 5G planning of the distribution network is established.The paper compares the economic solutions of 5G and 4G communications in city and town scenarios using the IEEE 123-node network as an example,and concludes that the economics of 5G are better than those of 4G.展开更多
A reverse osmosis （RO） desalination system coupled with tidal energy is proposed. The mechanical energy produced by the tidal energy through hydraulic turbine is directly used to drive the RO unit. The system perfor...A reverse osmosis （RO） desalination system coupled with tidal energy is proposed. The mechanical energy produced by the tidal energy through hydraulic turbine is directly used to drive the RO unit. The system performances and the water cost of the conventional and tidal energy RO systems are compared. It is found that the proposed tidal energy RO system can save water cost in the range of 31.0%-41.7% in comparison with the conventional RO system. There is an optimum feed pressure that leads to the lowest water cost. The tidal RO system can save more costs at a high feed pressure or a high water recovery rate. The optimum feed pressure of the tidal energy RO system is higher than that of the conventional RO system. The longer lifetime of the tidal energy RO system can save even more water cost. When the site development cost rate is lower than 40%, the water cost of the tidal energy RO system will be lower than that of the conventional RO system. The proposed technology will be an effective alternative desalination method in the future.展开更多
Scoring the technologies in competition for the NRG Canada’s Oil Sands Innovation Alliance Carbon XPRIZE required an economic evaluation to estimate the value created through the conversion of CO_(2) emissions into p...Scoring the technologies in competition for the NRG Canada’s Oil Sands Innovation Alliance Carbon XPRIZE required an economic evaluation to estimate the value created through the conversion of CO_(2) emissions into products.Across all of the Teams participating in the competition,58 different materials were consumed and produced.Standardized prices and market sizes needed to be established for each of these materials to ensure a consistent evaluation across all Teams.The Standards Data Set(SDS)was created as a standardized database of economic data used in the competition.The rationale for the SDS project and the methodology for researching each material is described.Ultimately,credible material definitions using the SDS methodology were created for all materials,and some research and methodological customization were required for materials that did not have credible,publicly available market data.The methodologies for establishing credible values and market sizes for concrete,concrete admixtures and syngas are highlighted as examples of materials whose value and markets are not easily defined.展开更多
文摘The research conducted investigation and survey on 186 farm households in 2014 and carried out economic evaluation on ＂planting three to produce four＂ highyielding project of super hybrid rice. The results showed that the project of ＂planting three to produce four＂ performed significantly in terms of increasing yields and incomes. For example, per unit area yield of one-season late hybrid rice and middleseason hybrid rice proved the highest, and net income from middle-season rice in Longhui was the highest. It is obvious that to increase per unit yield is key for improving net incomes and to reduce machine fees and worker fees is crucial for decreasing fees.
基金funded by the Beijing Natural Science Foundation (9144033)the National Social Science Fund for Major Projects (11&ZD164)
文摘Because forecasting a development program during the target selection phase of exploration for coalbed methane （CBM） is impossible, the conventional method that relies on a conceptual （or detailed） development pro- gram cannot be used during the economic evaluation of CBM resources. Hence, this study focuses on establishing an economic evaluation model based on the characteristics of the target selection phase. The discounted cashflow method is applied to the construction of the model with the assumption that there is a uniform distribution of produc- tion wells. The computational error generated by the assumption is corrected by introducing a correction factor based on the production profile of single CBM wells. The case study demonstrates that the blocks lacking economic value can be screened out, and the most advantageous targets can be found by computing the resource values in the best- and worst-case scenarios. This technique can help to reduce wasted investments and improve the quality of decision-making in selecting targets for exploration.
基金supported by the National Health Commission of the People’s Republic of China (formerly the Health and Family Planning Commission) of China (No. 201502004)
文摘Objective:This study evaluated the feasibility of different cervical cancer screening strategies in urban China.Methods:A Markov model was constructed to simulate a hypothetical cohort of 100,000 females aged 30-59 years in a 20-year period.Screening strategies included liquid-based cytology(LBC)every three years,human papillomavirus(HPV)DNA testing every three and five years,respectively,and a combination of HPV DNA testing and LBC(HPV+LBC)every three and five years,respectively.Model outcomes included cumulative incidence over 20 years,cumulative risk of cervical cancer,costs,life year saved(LYS),quality-adjusted life years(QALYs)and benefits.The cost-effectiveness ratios(CERs),incremental cost-effectiveness ratios(ICERs),costutility ratios(CURs),and benefit-cost ratios(BCRs)were used as outcomes in the health economic evaluation analysis.Univariate sensitivity analyses were performed to examine the stability of the results.Results:The cumulative incidence of the five screening strategies ranged from 833.02 to 1,158.07 cases per100,000 females.HPV DNA testing was most effective in reducing the cumulative risk of cervical cancer,saving life years and QALYs and gaining benefits.The CERs of HPV DNA testing every three and five years,and LBC every three years were considered to be very cost-effective if they were below China's GDP per capita.The CERs of HPV+LBC were considered to be cost-effective if they were below three times GDP per capita.The incremental cost-effectiveness analysis showed that HPV DNA testing every three and five years,LBC every three years and HPV+LBC every five years were dominant strategies.Conclusions:The findings of this study indicated that HPV DNA testing every five years or LBC every three years should be recommended in urban China.
基金Supported by a grant from The National Science and Technology Support Project in the 11th Five-year Plan (2006BAI12B07)
文摘OBJECTIVE:To analyze the cost effect of surrounding acupuncture plus electric acupuncture,cotton-sheet moxibustion,puncturing with red-hot needles,tapping plus cupping on herpes zoster.METHODS:Five hundred patients with herpes zoster were randomly divided into group A(surrounding acupuncture plus electric acupuncture),group B(cotton-sheet moxibustion),group C(puncturing with red-hot needles),group D(tapping plus cupping),and group E(Western medicine).The treatment was carried out twice a day in group E and once a day in the other four groups.The curative effect was observed on the 10th day of treatment;the cost was calculated for the five therapies,and the cost-effect ratio(C/E) and increment ratio(△ C/△ E) were analyzed.RESULTS:After the 10-day treatment,there was no statistical difference(P>0.05) in the curative effect among the five groups.Pain being alleviated one day faster than in group E amounted to a saving of RMB 21.90 yuan in group A,a saving of RMB 21.87 yuan in group B,a saving of RMB 26.00 yuan in group C,and a saving of RMB 20.23 yuan in group D.Compared with group C,the values of △ C/△ E were RMB 1.55,2.81,and 0.21 yuan in groups A,B,and D,respectively.CONCLUSIONS:The curative effect in groups A,B,C,and D was similar to that in group E,but the C/E was better than in group E.
基金supported in part by the Beijing Hospitals Authority Clinical Medicine Development of Special Funding Support (No. ZLRK202325)a grant from National Key R&D Program of China (No. 2018YFC 1313105)。
文摘Gastric cancer is a global public health burden, nearly one million new cases are diagnosed per year worldwide, of which 44% of cases occur in China. The prognosis of gastric cancer varies remarkably by the stage of cancer, and most of the patients in China are diagnosed at advanced stages, resulting in poor prognoses. Effective strategies to reduce the burden of gastric cancer include primary prevention through testing and treatment of Helicobacter pylori(H. pylori) and secondary prevention by screening and early detection. Although many countries have issued management guidelines and consensus reports concerning these strategies, the limited availability of healthcare resources often precludes their widespread implementation. Therefore, assessing the costs, benefits, and harms of population-based intervention measures through health economic evaluation is necessary for informed health policy decisions. Accordingly, we synthesize management approaches from different countries on H. pylori eradication and endoscopic screening, and also summarize recent advancements in health economic evaluations on population-based preventive strategies. The goal of the review is to provide empirical evidence supporting optimal resource allocation, maximizing benefits for the population, and ultimately reducing the burden of gastric cancer.
文摘The environment impact of the coal resources mining was analyzed. The method of economic evaluation for the coal mining was established to analyze land destruction. The opportunity cost method was used to quantitatively analyze and estimate the economic loss of the land destruction by coal mining. At the same time, the dump land reclamation of the Yuanbaoshan Open Pit was taken as an example to evaluate environmental and economical benefit with the method of economic evaluation for the coal mining areas land reclamation.
文摘The publication of ISO 15686-5 is significant for studies related to the life-cycle costs of buildings. Among the many economic evaluation methods, the NPV method is recommended for use by this standard. This study explains the concept and method of PV, and then provides an explanation of the concept and method of NPV, and points out the limitations in the practical application of the method.
文摘Hydraulic fracturing is among the approaches used to optimize production from a gas condensate reservoir. A detailed economic analysis is required to evaluate the profitability and feasibility of hydraulic fracturing as an optimization option in a gas condensate reservoir operating below dewpoint. The objective of this research is to evaluate the economic benefits derivable from the use of hydraulic fracturing to improve gas and liquid recovery from a gas condensate reservoir operating below dewpoint. This research considers the use of four profit indicators to ascertain the profitability of hydraulic fracturing in a gas condensate reservoir operating below dewpoint by increasing the fracture halflength, fracture width and fracture permeability. The production data of the reservoir was obtained and the economic calculations done on excel spreadsheet and plots generated. The four profit indicators considered in the research are Net Present Value, Payout, Discounted Cash Flow Rate of Return and Profit per Dollar Invested. The economic justification was done by carrying out a comparative economic analysis from the result obtained when the reservoir of study was unfractured with that obtained when the reservoir was fractured at various fracture parameters. The economic analysis was done considering a royalty and tax rate of 18.5% and 30% respectively and a gas price of $2/MSCF and condensate price of $30/bbl. This is done so as to find out if the additional cost of hydraulic fracturing can be offset by the recovery from the reservoir when its pressure declined below dewpoint. The result obtained showed that the additional recovery due to hydraulic fracturing by increasing the fracture halflength, fracture width and fracture permeability was not enough to justify the application of hydraulic fracturing when the reservoir pressure declined below dewpoint.
文摘China is rich in tight sandstone gas resources(“tight gas”for short).For example,the Sulige Gasfield in the Ordos Basin and the Upper Triassic Xujiahe Fm gas reservoir in the Sichuan Basin are typical tight gas reservoirs.In the past decade,tight gas reserve and production both have increased rapidly in China,but tight gas reservoirs are always managed as conventional gas reservoirs without effective fiscal,taxation and policy supports.The potential of sustainable tight gas production increase is obviously restricted.The tight gas development projects represented by the Sulige Gasfield have failed to make profit for a long period,and especially tight gas production has presented a slight decline since 2015.In this paper,a new economic evaluation method was proposed for tight gas development projects.The new method was designed to verify the key parameters(e.g.production decline rate and single-well economic service life)depending on tight gas development and production characteristics,and perform the depreciation by using the production method.Furthermore,the possibility that the operation cost may rise due to pressure-boosting production and intermittent opening of gas wells is considered.The method was used for the tight gas development project of Sulige Gasfield,showing that its profit level is much lower than the enterprise's cost level of capital.In order to support a sustainable development of tight gas industry in China,it is recommended that relevant authorities issue value-added tax(VAT)refund policy as soon as possible.It is necessary to restore the non-resident gas gate price of the provinces where tight gas is produced to the fair and reasonable level in addition to the fiscal subsidy of CNY0.24/m^(3),or offer the fiscal subsidy of CNY0.32/m^(3) directly based on the on-going gate price.With these support policies,tax income is expected to rise directly,fiscal expenditure will not increase,and gas consumption cost in China will be significantly cut down.
文摘Objective To evaluate the economy of detecting gastric cancer by electronic gastroscope in Chinese natural population of different ages and genders.Methods A Markov model was constructed for the population,including both men and women of different ages.The model cycle was one year and the simulation time was 60 years.The cost-effectiveness of electronic gastroscopy in detecting gastric cancer of general population in China was analyzed from the perspective of the whole society,and the stability of the results was verified by sensitivity analysis.Results and Conclusion For the general population,the incremental cost-effectiveness ratio(ICER)of gastric cancer screening from the age of 50 is 50143 yuan/QALY(quality-adjusted life-year),which is less than two times of per capita gross domestic product(GDP)compared with the screening from the age of 55.For men who start gastric cancer screening at the age of 50,the ICER is 38525 yuan/QALY,which is less than two times of per capita GDP,and it is economical.For women who start the screening from the age of 55,the ICER is 47814 yuan/QALY,which is less than two times of per capita GDP,so it is economical.The results of sensitivity analysis are consistent with the conclusions of basic analysis,and the results of basic analysis are stable.For the general population,it is more economical to start gastric cancer screening from the age of 50,while for men and women,it is more economical to start gastric cancer screening from the age of 50 and 55,respectively.
文摘Taking the economic evaluation of a highway with international bank loan in Guangxi mountainous and hilly areas as an example, this paper summarizes the characteristics of economic evaluation of international bank loan highway projects, and puts forward the economic evaluation model of international bank loan highway projects, which can provide reference for other international loan highway construction projects.
文摘At this stage, China is vigorously promoting the reform of the supply-side structure to promote the transformation and upgrading of the economy. In this process, the project investment decision of the enterprise plays a very important role, which affects the development of the enterprise. It is necessary to apply the financial and economic evaluation method in a timely manner to identify the risks in the project investment decision and improve the safety of the enterprise development. Based on this, this paper analyzes the financial and economic evaluation method from three aspects of connotation, significance and classification, clarifies the analysis that should be paid attention to in the application process of this method, and explains the specific application, in order to provide reference for the follow-up research in this field.
文摘Objective To systematically evaluate the overall characteristics and quality of literature on economic evaluation of drugs for type 2 diabetes,and to provide recommendations for future research and related decision-making.Methods The economic evaluation literature on drugs for type 2 diabetes based on the Chinese population were searched from CNKI,Wanfang,VIP and PubMed databases.The literature that met the inclusion criteria was selected,and the key research elements were extracted.Meanwhile,the quality of health economics studies(QHES)was used to evaluate the quality of the literature.Results and Conclusion A total of 325 articles(296 in Chinese and 29 in English)were included.Most of the studies were conducted by medical institutions(247 articles,76.0%)and they used cost-effectiveness analysis(295 articles,90.8%).However,most of the included literature did not report study perspective(267 articles,90.2%).The average QHES score of the included literature was 57.29,and the quality of the literature was concentrated in“low quality”(123 articles,37.8%)and“average quality”(138 articles,42.5%).Literature published in English journals,or using modeling methods,or from universities had relatively higher quality.The quality of economic evaluation literature on drugs for type 2 diabetes based on the Chinese population is generally low at present.There are many problems,such as single research institutions and methods,lack of research perspectives,and no sensitivity analysis.
基金supported by Scientific Research Foundation Project of Kunming Metallurgical College:Application of digital spatial information system in Panlongshan Iron Mine,Menghai County,Yunnan Province(2022xjy22)Scientific Research Fund project of Education Department of Yunnan Province:Research on ecological mine development model of resource-based enterprises in Yunnan Province under the background of ecological civilization--a case study of lead-zinc mining enterprises(2022J1308).
文摘With the rapid development of computer networks,digitization has become a new symbol of today's social and economic development.The"digitalization"of mining exploration and mining results data is one of the essential contents of current mining work.This article will use the large-scale mine engineering software Surpac Vision to construct a digital ore deposit model of the Manjiazhai section and realize the three-dimensional visualization of the ore body.It intuitively reflects the spatial continuity,thickness variation,resource reserves,and grade spatial distribution of ore bodies.On this basis,a block model is established.In calculating the valuation of the unit block,a computer is used to dynamically analyze the changes of ore bodies with different boundary grades and the changes of ore bodies'shape and average grade under single elements and combined elements.Comparative analysis shows that the ore bodies with comprehensive grade delimits have good continuity under the same boundary grade.The average grade and metal content are higher than the single-grade circled ore body,indicating that improving the comprehensive utilization of resources will be conducive to improving the service life of the mine and increasing the overall economic benefits of the mine,suggesting that it is adequate to apply the digital deposit model to the comprehensive utilization of mineral resources,which will provide data support for the green and sustainable development of mining enterprises.
文摘The rice-duck ecological system is one of the major practices of the traditional Chinese agriculture. A study on the effect of reducing methane emission using this practice provided theoretical and practical basis for further development and utilization of this classical agricultural technique. The effect of reducing methane emission and the economic benefits of rice-duck ecological system were studied by carrying out a field experiment and by using economic methodology. The daily variation of CH4 emission in late rice paddy field was basically consistent with the daily variation of atmospheric temperature. The highest emission occurred at the full tillering stage of late rice with a rate of 24.1 or 32.2 or 40.5 mg m^-2 h^-1 in no-tillage area with duck and no-tillage area without duck and conventional-tillage area without duck, respectively. The inhibition of methane emission was apparently effective in the rice-duck ecological system during the initial tillering stage and the full tillering stage. Compared to the no-tillage area without duck, methane emission decreased by 2.333 g m^-2. Compared to the conventional-tillage area without duck, methane emission decreased by 4.723 g m^-2. During the production period of late rice, the amount of methane emission in no-tillage area with duck was 3.373 g m^-2 lesser than that of no-tillage area without duck, and 5.59 g m^-2 less than that of conventional-tillage without duck area. The economic significance was analyzed. Farmers adopting the rice-duck ecological system obtained 2 166 and 4 207 RMB yuan ha^-1 more income than those who adopted a no-tillage without duck technique or conventional-tillage without duck technique, respectively. In addition to the reduction of the environmental pollution by methane emission, the farmers who adopted the rice-duck ecological system achieved economic benefits of 5 000 RMB yuan ha^-1, which was 2 206 and 4 274 RMB yuan ha^-1 more than those who adopted a no-tillage without duck technique and a conventional-tillage without duck technique, respectively. The rice-duck ecological system not only increased the economic benefits for farmers, but also reduced methane emission in rice paddy field. A sustainable agricultural production mode was formed.
基金supported by the National Basic Research Program("973" Project)(Grant No.2013CB632303)the Scientific Research Plan of Hubei Education Department(Grant NO.Q20131707)
文摘Seven kinds of used mineral lubricating oils,including hydraulic oils,film bearing oils,steam turbine oil and gear oils,were recycled by reclamation and adding additives.Physical and chemical properties of the recycled oils were measured and their lubrication performances were evaluated by the original and modified four-ball testers.Worn surfaces were analyzed by energy dispersive X-ray spectroscopy and Raman microscope.The recycling costs of burning,re-refined and refortified were estimated.Results showed that physical and chemical properties of the refortified oils were improved effectively and became in the industrial access standard.With the different friction materials under different loads,refortified oils provided excellent lubrication performances,much better than those of fresh oils.Because of additives replenished,the different lubrication films could form on the worn surfaces.A rough financial calculation revealed that the refortification process could produce the most economic value among the three methods.
基金This research was funded by the Youth Innovation Promotion Association of Chinese Academy of Sciences(1110000002)the Key Project of Chinese Academy of Sciences(QYZDJ-SSWDQC040).
文摘An increasing number of U.S.apple growers are now interested in using harvest platforms to increase harvest productivity,expand labor pool,and alleviate tough working conditions.To maximize benefits,functions of thinning,pruning&training,and infield sorting have been or are to be incorporated into harvest platforms.Though growers are most concerned with economic benefits,few cost-benefit studies had been conducted on different platforms.In the meantime,economic analysis procedure is complex and each analysis is for one specific machine(not for general purposes).No software has been developed as a general and ready-to-use tool for growers and researchers for the platform economic analysis.In this study,platforms,both available on the marketplace and developed in lab as pilot trials,were reviewed.Costs and benefits models were then established,based on which multi-purpose apple harvest platform economic evaluation software(iMPAHP)was developed(capable of evaluating a wide variety of apple harvest platforms).A case study(machine cost of$100000,accommodating 6 workers,processing apple incidence of 10%with 90%sort-out rate,and harvest,thinning,and pruning&training productivity increase by 40%,50%,and 60%,respectively)based on iMPAHP demonstrated that infield sorting,harvest,thinning,and pruning and training accounted for 48.4%,23.9%,14.3%,and 13.4%of the total benefits,respectively.In the case that the platform was in all-four-purpose-application,the net present value(NPV)analysis of a 10-year investment showed a positive return of$60547.However,without infield sorting function,the NPV resulted in a negative value,indicating a loss for the machine investment.Though incorporating the modular infield sorting system certainly increased the overall machine investment by$30000,the benefits outweighed the costs.
基金supported by the National Natural Sci-ence Foundation of China(No.52177114,61403127)Jiangxi Electric Power Co.,Ltd of State Grid(No.521820210005,521820220016).
文摘The rapid development of communication services in the power distribution network poses challenges for existing wireless communications,and the deployment of a fiber optic network is costly and difficult.The emerging 5G technology has been piloted in power distribution networks,though the cost-effectiveness of its large-scale deployment remains unclear.This paper proposes an economic evaluation method for 5G planning in power distribution networks,considering the coupling relationship between power distribution and communication networks and the identification of important network nodes.First,the objective function to solve the planned number of 5G base stations is established.This is solved using the adaptive particle swarm algorithm and K-means algorithm.Second,the coupling relationship between the distribution and communication networks is discussed and quantified.The node importance of the coupling network is analyzed to identify the important nodes,and micro base stations or optical fibers are added to improve the reliability of the distribution network at the communication level.Finally,an economic evaluation index of 5G planning of the distribution network is established.The paper compares the economic solutions of 5G and 4G communications in city and town scenarios using the IEEE 123-node network as an example,and concludes that the economics of 5G are better than those of 4G.
文摘A reverse osmosis （RO） desalination system coupled with tidal energy is proposed. The mechanical energy produced by the tidal energy through hydraulic turbine is directly used to drive the RO unit. The system performances and the water cost of the conventional and tidal energy RO systems are compared. It is found that the proposed tidal energy RO system can save water cost in the range of 31.0%-41.7% in comparison with the conventional RO system. There is an optimum feed pressure that leads to the lowest water cost. The tidal RO system can save more costs at a high feed pressure or a high water recovery rate. The optimum feed pressure of the tidal energy RO system is higher than that of the conventional RO system. The longer lifetime of the tidal energy RO system can save even more water cost. When the site development cost rate is lower than 40%, the water cost of the tidal energy RO system will be lower than that of the conventional RO system. The proposed technology will be an effective alternative desalination method in the future.
基金Funding for this project was provided by NRG and COSIA(Canada’s Oil Sands Innovation Alliance)through their sponsorship of the NRG COSIA Carbon XPRIZE.
文摘Scoring the technologies in competition for the NRG Canada’s Oil Sands Innovation Alliance Carbon XPRIZE required an economic evaluation to estimate the value created through the conversion of CO_(2) emissions into products.Across all of the Teams participating in the competition,58 different materials were consumed and produced.Standardized prices and market sizes needed to be established for each of these materials to ensure a consistent evaluation across all Teams.The Standards Data Set(SDS)was created as a standardized database of economic data used in the competition.The rationale for the SDS project and the methodology for researching each material is described.Ultimately,credible material definitions using the SDS methodology were created for all materials,and some research and methodological customization were required for materials that did not have credible,publicly available market data.The methodologies for establishing credible values and market sizes for concrete,concrete admixtures and syngas are highlighted as examples of materials whose value and markets are not easily defined.
