This paper concerns an optimal dividend-penalty problem for the risk models with surplus-dependent premiums.The objective is to maximize the difference of the expected cumulative discounted dividend payments received ...This paper concerns an optimal dividend-penalty problem for the risk models with surplus-dependent premiums.The objective is to maximize the difference of the expected cumulative discounted dividend payments received until the moment of ruin and a discounted penalty payment taken at the moment of ruin.Since the value function may be not smooth enough to be the classical solution of the HJB equation,the viscosity solution is involved.The optimal value function can be characterized as the smallest viscosity supersolution of the HJB equation and the optimal dividend-penalty strategy has a band structure.Finally,some numerical examples with gamma distribution for the claims are analyzed.展开更多
This study examines the pricing of municipal bonds before and after a currency shock in Switzerland.Two approaches are used to decompose the municipal to treasuries bond spreads into liquidity,maturity,and default ris...This study examines the pricing of municipal bonds before and after a currency shock in Switzerland.Two approaches are used to decompose the municipal to treasuries bond spreads into liquidity,maturity,and default risk premiums.The first approach is the model of the cross-sectional instrumental variables,and the second approach is the model of the instrumental variables with panel data.This study examines the composition of spreads for both approaches,in three scenarios:before,throughout,and after the currency shock.The study performed Durbin-Wu-Hausman tests for each decisive model to verify endogeneity issues,including the Lagrangian Multiplier test,the Cragg-Donald Wald F statistic to confirm the relationship of instrumental and endogenous variables,and the structural break test(Bai-Perron test)to determine the existence of structural breaks in bond distortions.This study finds that the currency price distortions of the Swiss franc in January 2015 made long-run changes in the composition of the municipal bond spreads.This research contributes to the understanding of municipal bond pricing by showing that default risk accounts for a large portion of the municipal bond spread,while maturity risk plays a lesser role.According to our empirical findings,unexpected large currency price shocks may have long-term implications on the municipal bond spreads.展开更多
Through analyzing the components of convertible bond＇s value, this paper studied the determinants of premiums of Chinese CBs. According to this research, the premiums in fixed period are significantly higher than tha...Through analyzing the components of convertible bond＇s value, this paper studied the determinants of premiums of Chinese CBs. According to this research, the premiums in fixed period are significantly higher than that in conversion period due to legal constraints. The premiums in conversion period are negatively related to conversion value, risk-free interest rate, whether the issuing firm has right to advance repayment, whether in selling back period, and additional selling back price, and are positively related to exercise price, risk, and redemption price.展开更多
The price of Middle East crude oil exported to Asian countries has been higher than that to Europe and America for a long period, and this price differential made Asian countries pay more than European and American co...The price of Middle East crude oil exported to Asian countries has been higher than that to Europe and America for a long period, and this price differential made Asian countries pay more than European and American countries. Prior investigations found that ＂Asian Crude Oil Premium＂ did exist at a relatively low oil price level. However, world oil price soared after 2003, making the price of Middle East crude oil exported to European countries or America rise quickly, sometimes even higher than that to Asia. Under this situation, this paper uses the price of Middle East crude oil sold to Europe or America or Asia to test if the premium exists at a high oil price level and concludes that the crude oil price premium of Asia against America does not exist, but the premium of Asia against Europe still exists.展开更多
The collective revelation of credit institutions as regards the imminence of specific risks materialising, which often follows long periods of underestimating probable losses, can trigger a broad-based financial delev...The collective revelation of credit institutions as regards the imminence of specific risks materialising, which often follows long periods of underestimating probable losses, can trigger a broad-based financial deleveraging via an overly high upsurge in banks＇ risk premiums vis-a-vis the dynamics of fundamentals underlying loan repayment capability. In this context, this paper seeks to investigate the banking sector＇s internal mechanisms that might bring about a negative spiral of credit risk by building a model for the interaction between the increase of the risk premium and that of net interest income and provisioning rate. Statistical results confirm that a higher risk premium is one of the major determinants of credit default in Romania and its excessive widening could affect financial stability in Romania.展开更多
Zero-utility principle is one of the main premium pricing principles,which has been widely used in insurance practice.In this paper,the nonparametric estimation of zero-utility premium is given.In addition,the consist...Zero-utility principle is one of the main premium pricing principles,which has been widely used in insurance practice.In this paper,the nonparametric estimation of zero-utility premium is given.In addition,the consistency and asymptotic normality of the estimation are proved.Some special cases including linear,exponential and quadratic utility are discussed.Finally,the Monte Carlo method is used to show the convergence rate of premium estimation.Furthermore,the histogram and Normal-Probability-Plot are given to investigate the asymptotic normality of the estimators.The results show that our estimations are good enough to use in practice.展开更多
This paper studies a defined contribution(DC)pension fund investment problem with return of premiums clauses in a stochastic interest rate and stochastic volatility environment.In practice,most of pension plans were s...This paper studies a defined contribution(DC)pension fund investment problem with return of premiums clauses in a stochastic interest rate and stochastic volatility environment.In practice,most of pension plans were subject to the return of premiums clauses to protect the rights of pension members who died before retirement.In the mathematical modeling,we assume that a part of pension members could withdraw their premiums if they died before retirement and surviving members could equally share the difference between accumulated contributions and returned premiums.We suppose that the financial market consists of a risk-free asset,a stock,and a zero-coupon bond.The interest rate is driven by a stochastic affine interest rate model and the stock price follows the Heston’s stochastic volatility model with stochastic interest rates.Different fund managers have different risk preferences,and the hyperbolic absolute risk aversion(HARA)utility function is a general one including a power utility,an exponential utility,and a logarithm utility as special cases.We are concerned with an optimal portfolio to maximize the expected utility of terminal wealth by choosing the HARA utility function in the analysis.By using the principle of dynamic programming and Legendre transform-dual theory,we obtain explicit solutions of optimal strategies.Some special cases are also derived in detail.Finally,a numerical simulation is provided to illustrate our results.展开更多
The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,...The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,three novel strain compensation constitutive equations were developed and rigorously assessed.The results indicate that the power function model(correlation coefficients r=0.98544)demonstrates greater prediction accuracy compared to other functions,with a calculated average activation energy of 507.968 kJ mol−1.Additionally,electron backscattered diffraction technology and transmission electron microscopy were used to analyze the evolution of the alloy microstructure during dynamic recrystallization under different deformation conditions.The results show that under high-temperature and large deformation conditions,the dislocation density and the degree of grain rotation increase,which promotes the formation and growth of new recrystallized grains,so that recrystallization is completed when the deformation amount reaches 30%.Besides,the increase in the temperature not only enhances the thermal activation mechanism,but also improves the grain size uniformity and texture consistency.Meanwhile,the carbide inhibits grain overgrowth by pinning grain boundaries,maintaining a fine and uniform grain structure of the alloy,and thereby improving the plasticity of the material.展开更多
Using detailed Chinese manufacturing firm production and trade data from 2000 to 2006,this study finds that offshoring significantly increases firms’average wages.First,using the quasi-natural experiment of China'...Using detailed Chinese manufacturing firm production and trade data from 2000 to 2006,this study finds that offshoring significantly increases firms’average wages.First,using the quasi-natural experiment of China's accession to the World Trade Organization,we investigate how a reduction in offshoring costs affects the manufacturing firm's wages and find that a productivity effect and a job-relocation effect are two possible channels.Second,the dynamic decomposition of industry-level wages indicates that the within-firm effect is 0.547,accounting for 31.5 percent of the total variation.Finally,a Mincer-type regression shows that offshoring also increases within-firm skill premiums.Our findings have strong implications for the government related to framing appropriate industrial policies to raise wages and reduce income inequality.展开更多
One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon c...One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon climate,this rice features plump,translucent grains with a rich aroma and a soft,sticky,and elastic texture.展开更多
In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequen...In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.展开更多
The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Cente...The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.展开更多
加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和...加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和Bottero公司开展施工前工程设计,并由Green City Glass公司担任业主工程师。此项工程将细化项目资本成本与施工进度,为公司的建设融资提供支持。展开更多
Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for makin...Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for making premium milk tea.Yoke The’Myanmar Milk Tea,a signature product from Taw Win Kanbawza Mountain Company(Myanmar),is a flagship of the country’s tea culture and reflects its distinctive flavors and local charm.展开更多
In the classical credibility theory, the credibility premium is derived on the basis of pure premium. However, the insurance practice demands that the premium must be charged under some adaptable premium principle and...In the classical credibility theory, the credibility premium is derived on the basis of pure premium. However, the insurance practice demands that the premium must be charged under some adaptable premium principle and serves the purpose for insurance business. In this paper, the balanced credibility models have been built under exponential principle, and the credibility estimator of individual exponential premium is derived. This result is also extended to the versions of multitude contracts, and the estimation of the structure parameters is investigated. Finally, the simulations have been introduced to show the consistency of the credibility estimator and its differences from the classical one.展开更多
AIM:To analysis of research hotspots and trends on the application of premium intraocular lens(PIOLs)in the past 2 decades.METHODS:The literature search was performed on the Web of Science and included PIOLs studies p...AIM:To analysis of research hotspots and trends on the application of premium intraocular lens(PIOLs)in the past 2 decades.METHODS:The literature search was performed on the Web of Science and included PIOLs studies published between January 2000 and December 2022.The retrieved literature was collated and analyzed by R-tool’s Bibliometrix package,CitNetExplorer,CiteSpace and other software.RESULTS:A total of 1801 articles about PIOLs were obtained,most of which were published in Spain and the United States.The organization that published the most articles was the University of Valencia in Spain.Alió JL,and Montés-Micó R,from Spain were the most influential authors in this field.The Journal of Cataract and Refractive Surgery and Journal of Refractive Surgery were the core journals for this field;the top 10 cited articles mainly focus on postoperative satisfaction with multifocal intraocular lens(IOLs)and postoperative results of toric IOLs.Through the keyword analysis,we found that trifocal IOLs,astigmatism and extended depth of focus(EDoF)IOLs are the most discussed topics at present,and the importance of astigmatism and the clinical application of the new generation of PIOLs are the emerging research trends.CONCLUSION:Bibliometric analysis can effectively help to identify multilevel concerns in PIOLs research and the prevailing research trends in the realm of PIOLs encompass the adoption of EDoF IOLs,trifocal IOLs,and their respective Toric models.展开更多
基金supported by National Natural Science Foundation of China(11471218)Hebei Higher School Science and Technology Research Projects(ZD20131017)Joint Doctoral Training Foundation of HEBUT(2018GN0001)。
文摘This paper concerns an optimal dividend-penalty problem for the risk models with surplus-dependent premiums.The objective is to maximize the difference of the expected cumulative discounted dividend payments received until the moment of ruin and a discounted penalty payment taken at the moment of ruin.Since the value function may be not smooth enough to be the classical solution of the HJB equation,the viscosity solution is involved.The optimal value function can be characterized as the smallest viscosity supersolution of the HJB equation and the optimal dividend-penalty strategy has a band structure.Finally,some numerical examples with gamma distribution for the claims are analyzed.
文摘This study examines the pricing of municipal bonds before and after a currency shock in Switzerland.Two approaches are used to decompose the municipal to treasuries bond spreads into liquidity,maturity,and default risk premiums.The first approach is the model of the cross-sectional instrumental variables,and the second approach is the model of the instrumental variables with panel data.This study examines the composition of spreads for both approaches,in three scenarios:before,throughout,and after the currency shock.The study performed Durbin-Wu-Hausman tests for each decisive model to verify endogeneity issues,including the Lagrangian Multiplier test,the Cragg-Donald Wald F statistic to confirm the relationship of instrumental and endogenous variables,and the structural break test(Bai-Perron test)to determine the existence of structural breaks in bond distortions.This study finds that the currency price distortions of the Swiss franc in January 2015 made long-run changes in the composition of the municipal bond spreads.This research contributes to the understanding of municipal bond pricing by showing that default risk accounts for a large portion of the municipal bond spread,while maturity risk plays a lesser role.According to our empirical findings,unexpected large currency price shocks may have long-term implications on the municipal bond spreads.
文摘Through analyzing the components of convertible bond＇s value, this paper studied the determinants of premiums of Chinese CBs. According to this research, the premiums in fixed period are significantly higher than that in conversion period due to legal constraints. The premiums in conversion period are negatively related to conversion value, risk-free interest rate, whether the issuing firm has right to advance repayment, whether in selling back period, and additional selling back price, and are positively related to exercise price, risk, and redemption price.
文摘The price of Middle East crude oil exported to Asian countries has been higher than that to Europe and America for a long period, and this price differential made Asian countries pay more than European and American countries. Prior investigations found that ＂Asian Crude Oil Premium＂ did exist at a relatively low oil price level. However, world oil price soared after 2003, making the price of Middle East crude oil exported to European countries or America rise quickly, sometimes even higher than that to Asia. Under this situation, this paper uses the price of Middle East crude oil sold to Europe or America or Asia to test if the premium exists at a high oil price level and concludes that the crude oil price premium of Asia against America does not exist, but the premium of Asia against Europe still exists.
文摘The collective revelation of credit institutions as regards the imminence of specific risks materialising, which often follows long periods of underestimating probable losses, can trigger a broad-based financial deleveraging via an overly high upsurge in banks＇ risk premiums vis-a-vis the dynamics of fundamentals underlying loan repayment capability. In this context, this paper seeks to investigate the banking sector＇s internal mechanisms that might bring about a negative spiral of credit risk by building a model for the interaction between the increase of the risk premium and that of net interest income and provisioning rate. Statistical results confirm that a higher risk premium is one of the major determinants of credit default in Romania and its excessive widening could affect financial stability in Romania.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos.71761019 and71563021the Natural science foundation of Jiangxi Province under Grant No.20171ACB21022
文摘Zero-utility principle is one of the main premium pricing principles,which has been widely used in insurance practice.In this paper,the nonparametric estimation of zero-utility premium is given.In addition,the consistency and asymptotic normality of the estimation are proved.Some special cases including linear,exponential and quadratic utility are discussed.Finally,the Monte Carlo method is used to show the convergence rate of premium estimation.Furthermore,the histogram and Normal-Probability-Plot are given to investigate the asymptotic normality of the estimators.The results show that our estimations are good enough to use in practice.
基金supported by the National Social Science Foundation of China (No.21FJYB042)。
文摘This paper studies a defined contribution(DC)pension fund investment problem with return of premiums clauses in a stochastic interest rate and stochastic volatility environment.In practice,most of pension plans were subject to the return of premiums clauses to protect the rights of pension members who died before retirement.In the mathematical modeling,we assume that a part of pension members could withdraw their premiums if they died before retirement and surviving members could equally share the difference between accumulated contributions and returned premiums.We suppose that the financial market consists of a risk-free asset,a stock,and a zero-coupon bond.The interest rate is driven by a stochastic affine interest rate model and the stock price follows the Heston’s stochastic volatility model with stochastic interest rates.Different fund managers have different risk preferences,and the hyperbolic absolute risk aversion(HARA)utility function is a general one including a power utility,an exponential utility,and a logarithm utility as special cases.We are concerned with an optimal portfolio to maximize the expected utility of terminal wealth by choosing the HARA utility function in the analysis.By using the principle of dynamic programming and Legendre transform-dual theory,we obtain explicit solutions of optimal strategies.Some special cases are also derived in detail.Finally,a numerical simulation is provided to illustrate our results.
基金supported by the National Key R&D Program of China(No.2021YFB3700403).
文摘The hot deformation behavior of the premium GH4738 alloy was investigated in the temperature range of 1313 to 1353 K at strain rates of 0.01 to 1 s^(−1)using the hot compression test.To accurately predict flow stress,three novel strain compensation constitutive equations were developed and rigorously assessed.The results indicate that the power function model(correlation coefficients r=0.98544)demonstrates greater prediction accuracy compared to other functions,with a calculated average activation energy of 507.968 kJ mol−1.Additionally,electron backscattered diffraction technology and transmission electron microscopy were used to analyze the evolution of the alloy microstructure during dynamic recrystallization under different deformation conditions.The results show that under high-temperature and large deformation conditions,the dislocation density and the degree of grain rotation increase,which promotes the formation and growth of new recrystallized grains,so that recrystallization is completed when the deformation amount reaches 30%.Besides,the increase in the temperature not only enhances the thermal activation mechanism,but also improves the grain size uniformity and texture consistency.Meanwhile,the carbide inhibits grain overgrowth by pinning grain boundaries,maintaining a fine and uniform grain structure of the alloy,and thereby improving the plasticity of the material.
基金This research was financially supported by the National Social Science Foundation of China(No.20AJY014)the Social Science Foundation of Jiangsu Province(No.20EYA002),and the Key Project of Philosophy and Social Science Research in Colleges and Universities in Jiangsu Province(No.2018SJZDA011)The authors thank two anonymous reviewers for their helpful comments and suggestions for improving this paper.
文摘Using detailed Chinese manufacturing firm production and trade data from 2000 to 2006,this study finds that offshoring significantly increases firms’average wages.First,using the quasi-natural experiment of China's accession to the World Trade Organization,we investigate how a reduction in offshoring costs affects the manufacturing firm's wages and find that a productivity effect and a job-relocation effect are two possible channels.Second,the dynamic decomposition of industry-level wages indicates that the within-firm effect is 0.547,accounting for 31.5 percent of the total variation.Finally,a Mincer-type regression shows that offshoring also increases within-firm skill premiums.Our findings have strong implications for the government related to framing appropriate industrial policies to raise wages and reduce income inequality.
文摘One of Cambodia’s leading rice exporters,Apsara Rice,is known for its flagship product Apsara fragrant rice.Nurtured by the country’s fertile red soil and ample sunlight and rainfall thanks to its tropical monsoon climate,this rice features plump,translucent grains with a rich aroma and a soft,sticky,and elastic texture.
文摘In petroleum extraction,the sealing surfaces of bolted joints are susceptible to damage due to the high-temperature and high-pressure conditions in wellbores.This damage adversely affects sealing performance,consequently leading to the failure and damage of threaded connections.In severe cases,it can result in considerable economic losses and trigger safety accidents.The sealing performance of special bolted joints holds crucial importance for production efficiency,output,equipment lifespan,and cost control.Enhancing the sealing perfor-mance of threaded connections can have a positive impact on industrial production and environmental protection.The existing research on American Petroleum Institute threaded joints has been thorough and has obtained a series of excellent results.However,the research on the sealing damage mechanism of threaded connections under complex well conditions lacks sufficient depth and that on new sealing technology is scarce.This study proposes a half-size evaluation test to address the abovementioned problem.Based on this test,an investigation into the sealing performance of threaded connections under high-temperature,cyclic loading,and high-temperature creep conditions is conducted.This study uses a combined approach of finite element methods and experiments to investigate the impact of different makeup torques on the sealing performance of premium threaded connections(PTCs).The results of the half-size evaluation test indicate that temperature notably influences the sealing performance of threaded connections.The continuous action of high temperatures causes contact pressure and sealing performance to decrease,and sealing contact pressure increases after cooling.Finite element and test results show that for a certain joint A,the greater the torque,the higher the critical sealing pressure of the thread,and the better the sealing performance.The research on the sealing damage mechanism of PTCs provides a scientific basis and theoretical guidance for the further optimization and development of PTCs.
文摘The 51st China Beijing International Gifts,Premium and Houseware Exhibition(hereinafter referred to as the Gifts Exhibition) officially opened the kaleidoscope of creative gifts at China International Exhibition Center (Chaoyang Pavilion) on March 20th.More than 900 exhibitors built an aesthetic corridor of quality life with 200,000 gifts.
文摘加拿大Premium砂业公司发布太阳能玻璃制造计划进展通报。美国项目进展目前,Premium持续推进其位于美国南部的压花太阳能玻璃制造工厂(“美国项目”)开发工作,该工厂预计年产相当于4GW的压花太阳能玻璃。公司已选定Toledo Engineering和Bottero公司开展施工前工程设计,并由Green City Glass公司担任业主工程师。此项工程将细化项目资本成本与施工进度,为公司的建设融资提供支持。
文摘Myanmar has a long teagrowing tradition,with 800,000 acres of plantations in both northern and southern Shan State.Its unspoiled environment offers a unique natural advantage,providing top-quality tea leaves for making premium milk tea.Yoke The’Myanmar Milk Tea,a signature product from Taw Win Kanbawza Mountain Company(Myanmar),is a flagship of the country’s tea culture and reflects its distinctive flavors and local charm.
基金Supported by National Natural Science Foundation of China （Grant No. 71001046）, Science Foundation of the Education Department of Jiangxi （Grant No. GJJ10096）, and Scientific Funds of Jiangxi Normal University
文摘In the classical credibility theory, the credibility premium is derived on the basis of pure premium. However, the insurance practice demands that the premium must be charged under some adaptable premium principle and serves the purpose for insurance business. In this paper, the balanced credibility models have been built under exponential principle, and the credibility estimator of individual exponential premium is derived. This result is also extended to the versions of multitude contracts, and the estimation of the structure parameters is investigated. Finally, the simulations have been introduced to show the consistency of the credibility estimator and its differences from the classical one.
基金Supported by the National Natural Science Foundation of China(No.82371033No.81970772)+1 种基金the Tianjin Natural Science Foundation(No.21JCZDJC01250)the Tianjin Key Medical Discipline(Specialty)Construction Project(No.TJYXZDXK-016A).
文摘AIM:To analysis of research hotspots and trends on the application of premium intraocular lens(PIOLs)in the past 2 decades.METHODS:The literature search was performed on the Web of Science and included PIOLs studies published between January 2000 and December 2022.The retrieved literature was collated and analyzed by R-tool’s Bibliometrix package,CitNetExplorer,CiteSpace and other software.RESULTS:A total of 1801 articles about PIOLs were obtained,most of which were published in Spain and the United States.The organization that published the most articles was the University of Valencia in Spain.Alió JL,and Montés-Micó R,from Spain were the most influential authors in this field.The Journal of Cataract and Refractive Surgery and Journal of Refractive Surgery were the core journals for this field;the top 10 cited articles mainly focus on postoperative satisfaction with multifocal intraocular lens(IOLs)and postoperative results of toric IOLs.Through the keyword analysis,we found that trifocal IOLs,astigmatism and extended depth of focus(EDoF)IOLs are the most discussed topics at present,and the importance of astigmatism and the clinical application of the new generation of PIOLs are the emerging research trends.CONCLUSION:Bibliometric analysis can effectively help to identify multilevel concerns in PIOLs research and the prevailing research trends in the realm of PIOLs encompass the adoption of EDoF IOLs,trifocal IOLs,and their respective Toric models.
