Profitability analysis of a femtosecond laser system for cataract surgery using a fuzzy logic approach

AIM：To define the financial and management conditions required to introduce a femtosecond laser system for cataract surgery in a clinic using a fuzzy logic approach.METHODS：In the simulation performed in the current study,the costs associated to the acquisition and use of a commercially available femtosecond laser platform for cataract surgery（VICTUS,TECHNOLAS Perfect Vision GmbH,Bausch ＆ Lomb,Munich,Germany） during a period of 5y were considered.A sensitivity analysis was performed considering such costs and the countable amortization of the system during this 5y period.Furthermore,a fuzzy logic analysis was used to obtain an estimation of the money income associated to each femtosecond laser-assisted cataract surgery（G）. RESULTS：According to the sensitivity analysis,the femtosecond laser system under evaluation can be profitable if 1400 cataract surgeries are performed per year and if each surgery can be invoiced more than $500.In contrast,the fuzzy logic analysis confirmed that the patient had to pay more per surgery,between $661.8 and $667.4 per surgery,without considering the cost of the intraocular lens（IOL）.CONCLUSION：A profitability of femtosecond laser systems for cataract surgery can be obtained after a detailed financial analysis,especially in those centers with large volumes of patients.The cost of the surgery for patients should be adapted to the real flow of patients with the ability of paying a reasonable range of cost.

Dynamic optimal allocation of energy storage systems integrated within photovoltaic based on a dual timescale dynamics model

Energy storage systems(ESSs)operate as independent market participants and collaborate with photovoltaic(PV)generation units to enhance the flexible power supply capabilities of PV units.However,the dynamic variations in the profitability of ESSs in the electricity market are yet to be fully understood.This study introduces a dual-timescale dynamics model that integrates a spot market clearing(SMC)model into a system dynamics(SD)model to investigate the profit-aware capacity growth of ESSs and compares the profitability of independent energy storage systems(IESSs)with that of an ESS integrated within a PV(PV-ESS).Furthermore,this study aims to ascertain the optimal allocation of the PV-ESS.First,SD and SMC models were set up.Second,the SMC model simulated on an hourly timescale was incorporated into the SD model as a subsystem,a dual-timescale model was constructed.Finally,a development simulation and profitability analysis was conducted from 2022 to 2040 to reveal the dynamic optimal range of PV-ESS allocation.Additionally,negative electricity prices were considered during clearing processes.The simulation results revealed differences in profitability and capacity growth between IESS and PV-ESS,helping grid investors and policymakers to determine the boundaries of ESSs and dynamic optimal allocation of PV-ESSs.

Research on The Factors Affecting Profit Allocation Based on Virtual Supply Chain

Traditional profit allocation solutions cannot be effectively applied to the practice for the limitations in their premises and principles. This paper based on the practical processes of virtual supply chain performs analysis on major factors relative to cost and risk which effect the profit allocation among the partners, and then proposes the quantitative relations between the factors and profit allocation. The relations can serve as a base for further research on extensive profit allocation model.

Economical Analysis of Flexible Machining

From the point of view of market economy, aiming at the flexible machiningproblem,this paper discusses how to determine the maximum profit-orientedoptimum preduction quantity, optimum cutting speed and optimum price underthe condition of single machines,single type of product and limited resources.

Return of investment and profitability analysis of bio-fuels production using a modeling approach

The objectives of this study were to evaluate the return of investment and profitability of a bio-gasification facility using a modeling method.Based on preliminary market analysis,the results determined that the power facilities driven by biomass gasifiers could be profitable if they consider the most sensitive cost factors such as labor,project investment,and feedstock supply.The result showed that economic feasibility of bio-gasification facility can significantly affect by its production capacity and operating modes(one shift,two shifts,or three shifts).The cost analysis modeling approach developed in this study could be a good approach for economic analysis of bio-syngas and bio-fuel products.In addition,this study demonstrated a unique modeling approach to analyze return of investment and profitability of biofuels production.

Profit Showing Upward Trend The analysis of economic performance of China's cotton textile industry in first half 2010(Part A)

Output continued recovery China’s cotton textile industry saw a a slight slump in growth rate of cotton yarn production and cotton cloth production in the first half of 2010 comparedto the Jan.

Profit Showing Upward Trend The analysis of economic performance of China's cotton textile industry in first half 2010(Part B)

Profit turned positive According to data collected from 11,773 statistics-worthy Chinese cotton textile enterprises surveyed by National Bureau of Statistics of China,

Hydrochar and synthetic natural gas co-production for a full circular economy implementation via hydrothermal carbonization and methanation:An economic approach

Herein we study the economic performance of hydrochar and synthetic natural gas coproduction from olive tree pruning.The process entails a combination of hydrothermal carbonization and methanation.In a previous work,we evidenced that standalone hydrochar production via HTC results unprofitable.Hence,we propose a step forward on the process design by implementing a methanation,adding value to the gas effluent in an attempt to boost the overall process techno-economic aspects.Three different plant capacities were analyzed(312.5,625 and 1250 kg/hr).The baseline scenarios showed that,under the current circumstances,our circular economy strategy in unprofitable.An analysis of the revenues shows that hydrochar selling price have a high impact on NPV and subsidies for renewable coal production could help to boost the profitability of the process.On the contrary,the analysis for natural gas prices reveals that prices 8 times higher than the current ones in Spain must be achieved to reach profitability.This seems unlikely even under the presence of a strong subsidy scheme.The costs analysis suggests that a remarkable electricity cost reduction or electricity consumption of the HTC stage could be a potential strategy to reach profitability scenarios.Furthermore,significant reduction of green hydrogen production costs is deemed instrumental to improve the economic performance of the process.These results show the formidable techno-economic challenge that our society faces in the path towards circular economy societies.

FURTHER RESEARCH OF A NEW KIND OF SERIES REPAIRABLE SYSTEM

This paper is devoted to studying the uniqueness and existence of the system dynamic solution by using C0-semigroup theory and discussing its exponential stability by analyzing the spectrul distribution of system operator and its quasi-compactness. Some primary reliability indices are discussed with the eigenfunction of system operator and the optimal vacation time to get the maximum system profit is analyzed at the end of paper.