Objectives:To access the effectiveness of our modified right-ventricular overhauling procedure on tricuspid valve(TV)growth in patients with pulmonary atresia with intact ventricular septum(PAIVS).Methods:We retrospec...Objectives:To access the effectiveness of our modified right-ventricular overhauling procedure on tricuspid valve(TV)growth in patients with pulmonary atresia with intact ventricular septum(PAIVS).Methods:We retrospectively reviewed 21 patients with PAIVS who underwent modified right ventricular overhauling(mRVoh)between 2008 and 2019 at two institutions.Our mRVoh consisted of wide resection of hypertrophied infundibular and trabecular muscle,peeling off fibrotic endocardial tissue in the right ventricle(RV)cavity,surgical pulmonary valvotomy,and Blalock-Taussig shunt or banding of ductus arteriosus under cardiopulmonary bypass.The TV annulus sizes were measured and analyzed using echocardiography before and after mRVoh.Results:No mortalities were observed during a median follow-up of 3 years(interquartile range:1.3–4.7 years)of follow-up were noted.mRVoh was performed at a median age of 163.5 days(range:21–560 days),including seven neonates and two infants(<60 days).During follow-up,the median TV annular z-score increased significantly from−2.24 to−1.15 before and after mRVoh(p=0.004).In ten patients with a prior history of percutaneous interventions for RV outflow tract(RVOT)widening at least 6 months before mRVoh,the TV annular z-score significantly changed during the period after mRVoh(−2.03 to−1.61,p=0.028)compared with the period before mRVoh(−2.51→–2.03,p=0.575)after percutaneous intervention only.Conclusions:mRVoh in PAIVS patients was positively associated with TV annular growth,and it was more effective than percutaneous RVOT widening interventions without mRVoh.展开更多
The purpose of this research was to develop a new approach in determination of overhaul and maintenance cost of loading equipment in surface mining. Two statistical models including univariate exponential regression (...The purpose of this research was to develop a new approach in determination of overhaul and maintenance cost of loading equipment in surface mining. Two statistical models including univariate exponential regression (UER) and multivariate linear regression (MLR) were used in this study. Loading equipment parameters such as bucket capacity, machine weight, engine power, boom length, digging depth, and dumping height were considered as variables. The results obtained by models and mean absolute error rate indicate that these models can be applied as the useful tool in determination of overhaul and maintenance cost of loading equipment. The results of this study can be used by the decision-makers for the specific surface mining operations.展开更多
A engineering system is usually repairable, and failure process of a repairable by a failure point process. The power law model is a commonly used approach to model syst the em is often described failure point process...A engineering system is usually repairable, and failure process of a repairable by a failure point process. The power law model is a commonly used approach to model syst the em is often described failure point process. This paper introduces the concept and model for the failure process of repairable system. The method of parameter estimation is developed, and failure observations are fitted into a power-law model by using the least square method. Two applications of the pressent model are discussed according to the practical failure data of the central cooling system of a nuclear power plant. One application is determining the optimal overhaul time, and the other is evaluating the quality of maintenance. This paper provides references for the overhaul decision making and maintenance quality evaluation in reality.展开更多
It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendation...It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendations given in the engine maintenance management manual, and taking the repair levels adopted in the previous shop visits into account, a series of module repair level optimization rules were set up, and a shop visit cost optimization model was also created for engine service life cycle. The particle swarm method was used to optimize the engine workscope and overhaul cost. The method proposed in this paper will be a reference for airlines to make engine workscope and to do engine maintenance management.展开更多
In this paper, the degrading regularities for quipment reliability and performance are discussed. Based on the isodegrading model, the characteristics of the cost and benefit in the equipment life circle are studied. ...In this paper, the degrading regularities for quipment reliability and performance are discussed. Based on the isodegrading model, the characteristics of the cost and benefit in the equipment life circle are studied. Using the principle of getting maximum Net Annual Value(NAV), a valid method for forecasting economic life circle is proposed.展开更多
THE East African nation of Ethiopia is hoping to inaugurate its first and very own city rail system in 2015. The Addis Ababa Light Railway Transit. being constructed with loans obtained mainly from the Export-Import B...THE East African nation of Ethiopia is hoping to inaugurate its first and very own city rail system in 2015. The Addis Ababa Light Railway Transit. being constructed with loans obtained mainly from the Export-Import Bank of China, is hugely anticipated to ease the chronic transportation woes of Ethiopia＇s congested capital.展开更多
China＇s personal income tax threshold isexpected to rise to 5,000 yuan （$776）per month from the current 3,500 yuan（$544）, according to a draft amendment on theIndividual Income Tax Law recently submittedto the co...China＇s personal income tax threshold isexpected to rise to 5,000 yuan （$776）per month from the current 3,500 yuan（$544）, according to a draft amendment on theIndividual Income Tax Law recently submittedto the countr＇s top legislature, the StandingCommittee of the National People＇s Congress.The amendment is the seventh tax overhaulsince the personal income tax code was issuedin 1980.展开更多
China's economic growth since reform and opening up began in 1978 is nothing short of miraculous.The "cultural revolution"(1966-76)left China with a struggling economy,a disorganized government structure...China's economic growth since reform and opening up began in 1978 is nothing short of miraculous.The "cultural revolution"(1966-76)left China with a struggling economy,a disorganized government structure,a broken educational system and a starving population.The country used new technologies to completely overhaul its agricultural model and manufacturing capabilities.展开更多
China’s iron and steel industry accelerates its reorganization process China Baowu Steel Group Corp., China’s largest steel producer, has acquired a control ing stake in another steel giant Magang Group, according t...China’s iron and steel industry accelerates its reorganization process China Baowu Steel Group Corp., China’s largest steel producer, has acquired a control ing stake in another steel giant Magang Group, according to an announcement by Maanshan Iron and Steel Co. Ltd.展开更多
The government plans to lift re-strictions on where people work andlive.The move wi1l create a more mo-bile workforce it is hoped.The ministries of public security,construction and agriculture as well asthe State Comm...The government plans to lift re-strictions on where people work andlive.The move wi1l create a more mo-bile workforce it is hoped.The ministries of public security,construction and agriculture as well asthe State Commission for Restructur-ing the Economy have started surveysas a first step to reforming the systemof household registration in smalltowns and cities.展开更多
Reform has brought hope,but also concern,to workers across ChinaThe National Development and Reform Commission published a plan to change China’s golden week holiday system on November 9.The change sees the end of th...Reform has brought hope,but also concern,to workers across ChinaThe National Development and Reform Commission published a plan to change China’s golden week holiday system on November 9.The change sees the end of the three-day May Day holiday and the creation of three single-day holidays that fall on traditional Chinese festivals—the Tomb-Sweeping Day,the Dragon Boat Festival and the Mid- Autumn Festival.One day off work remains on May Day. The change increases the number of non-working daYs per year from 114 to 115. In addition,according to a newly issued paid vacation plan,workers who remain in the same company for more than one year should enjoy a paid vacation,the length展开更多
U.S.President Barack Obama signed a new financial regulatory bill,supposedly the most comprehensive overhaul on Wall Street since the Great Depression in the 1930s,into uly.Zuo Xiaolei,chief economist at the Beijing-b...U.S.President Barack Obama signed a new financial regulatory bill,supposedly the most comprehensive overhaul on Wall Street since the Great Depression in the 1930s,into uly.Zuo Xiaolei,chief economist at the Beijing-based Galaxy Securities Co.Ltd.,contends that the new law could have adverse impact on emerging economies.She shared her views with Shanghai Securities News.Edited excerpts follow:展开更多
文摘Objectives:To access the effectiveness of our modified right-ventricular overhauling procedure on tricuspid valve(TV)growth in patients with pulmonary atresia with intact ventricular septum(PAIVS).Methods:We retrospectively reviewed 21 patients with PAIVS who underwent modified right ventricular overhauling(mRVoh)between 2008 and 2019 at two institutions.Our mRVoh consisted of wide resection of hypertrophied infundibular and trabecular muscle,peeling off fibrotic endocardial tissue in the right ventricle(RV)cavity,surgical pulmonary valvotomy,and Blalock-Taussig shunt or banding of ductus arteriosus under cardiopulmonary bypass.The TV annulus sizes were measured and analyzed using echocardiography before and after mRVoh.Results:No mortalities were observed during a median follow-up of 3 years(interquartile range:1.3–4.7 years)of follow-up were noted.mRVoh was performed at a median age of 163.5 days(range:21–560 days),including seven neonates and two infants(<60 days).During follow-up,the median TV annular z-score increased significantly from−2.24 to−1.15 before and after mRVoh(p=0.004).In ten patients with a prior history of percutaneous interventions for RV outflow tract(RVOT)widening at least 6 months before mRVoh,the TV annular z-score significantly changed during the period after mRVoh(−2.03 to−1.61,p=0.028)compared with the period before mRVoh(−2.51→–2.03,p=0.575)after percutaneous intervention only.Conclusions:mRVoh in PAIVS patients was positively associated with TV annular growth,and it was more effective than percutaneous RVOT widening interventions without mRVoh.
文摘The purpose of this research was to develop a new approach in determination of overhaul and maintenance cost of loading equipment in surface mining. Two statistical models including univariate exponential regression (UER) and multivariate linear regression (MLR) were used in this study. Loading equipment parameters such as bucket capacity, machine weight, engine power, boom length, digging depth, and dumping height were considered as variables. The results obtained by models and mean absolute error rate indicate that these models can be applied as the useful tool in determination of overhaul and maintenance cost of loading equipment. The results of this study can be used by the decision-makers for the specific surface mining operations.
基金supported by the National Natural Science Foundation of China(71771029)
文摘A engineering system is usually repairable, and failure process of a repairable by a failure point process. The power law model is a commonly used approach to model syst the em is often described failure point process. This paper introduces the concept and model for the failure process of repairable system. The method of parameter estimation is developed, and failure observations are fitted into a power-law model by using the least square method. Two applications of the pressent model are discussed according to the practical failure data of the central cooling system of a nuclear power plant. One application is determining the optimal overhaul time, and the other is evaluating the quality of maintenance. This paper provides references for the overhaul decision making and maintenance quality evaluation in reality.
文摘It is an important task for airlines to make a reasonable workscope for their engines, which has effects not only on engine performance and reliability, but also on airlines operating cost. Based on the recommendations given in the engine maintenance management manual, and taking the repair levels adopted in the previous shop visits into account, a series of module repair level optimization rules were set up, and a shop visit cost optimization model was also created for engine service life cycle. The particle swarm method was used to optimize the engine workscope and overhaul cost. The method proposed in this paper will be a reference for airlines to make engine workscope and to do engine maintenance management.
文摘In this paper, the degrading regularities for quipment reliability and performance are discussed. Based on the isodegrading model, the characteristics of the cost and benefit in the equipment life circle are studied. Using the principle of getting maximum Net Annual Value(NAV), a valid method for forecasting economic life circle is proposed.
文摘THE East African nation of Ethiopia is hoping to inaugurate its first and very own city rail system in 2015. The Addis Ababa Light Railway Transit. being constructed with loans obtained mainly from the Export-Import Bank of China, is hugely anticipated to ease the chronic transportation woes of Ethiopia＇s congested capital.
文摘China＇s personal income tax threshold isexpected to rise to 5,000 yuan （$776）per month from the current 3,500 yuan（$544）, according to a draft amendment on theIndividual Income Tax Law recently submittedto the countr＇s top legislature, the StandingCommittee of the National People＇s Congress.The amendment is the seventh tax overhaulsince the personal income tax code was issuedin 1980.
文摘China's economic growth since reform and opening up began in 1978 is nothing short of miraculous.The "cultural revolution"(1966-76)left China with a struggling economy,a disorganized government structure,a broken educational system and a starving population.The country used new technologies to completely overhaul its agricultural model and manufacturing capabilities.
文摘China’s iron and steel industry accelerates its reorganization process China Baowu Steel Group Corp., China’s largest steel producer, has acquired a control ing stake in another steel giant Magang Group, according to an announcement by Maanshan Iron and Steel Co. Ltd.
文摘The government plans to lift re-strictions on where people work andlive.The move wi1l create a more mo-bile workforce it is hoped.The ministries of public security,construction and agriculture as well asthe State Commission for Restructur-ing the Economy have started surveysas a first step to reforming the systemof household registration in smalltowns and cities.
文摘Reform has brought hope,but also concern,to workers across ChinaThe National Development and Reform Commission published a plan to change China’s golden week holiday system on November 9.The change sees the end of the three-day May Day holiday and the creation of three single-day holidays that fall on traditional Chinese festivals—the Tomb-Sweeping Day,the Dragon Boat Festival and the Mid- Autumn Festival.One day off work remains on May Day. The change increases the number of non-working daYs per year from 114 to 115. In addition,according to a newly issued paid vacation plan,workers who remain in the same company for more than one year should enjoy a paid vacation,the length
文摘U.S.President Barack Obama signed a new financial regulatory bill,supposedly the most comprehensive overhaul on Wall Street since the Great Depression in the 1930s,into uly.Zuo Xiaolei,chief economist at the Beijing-based Galaxy Securities Co.Ltd.,contends that the new law could have adverse impact on emerging economies.She shared her views with Shanghai Securities News.Edited excerpts follow:
