Coal preparation is an integral part of the coal commodity supply chain. This stage of post-mining, pre-utilization beneficiation uses low-cost separation technologies to remove unwanted mineral matter and moisture wh...Coal preparation is an integral part of the coal commodity supply chain. This stage of post-mining, pre-utilization beneficiation uses low-cost separation technologies to remove unwanted mineral matter and moisture which hinder the value of the coal product. Coal preparation plants typically employ several parallel circuits of cleaning and dewatering operations, with each circuit designed to optimally treat a specific size range of coal. Recent innovations in coal preparation have increased the efficiency and capac- ity of individual unit operations while reinforcing the standard parallel cleaning approach. This article, which describes the historical influences and state-of-the-art design for the various coal preparation unit operations, is organized to distinguish between coarse/intermediate coal cleaning and fine/ultrafine coal cleaning. Size reduction, screening, classification, cleaning, dewatering, waste disposal unit operations are particularly highlighted, with a special focus on the LI.S. design philosophy. Notable differences between the U.S. and international operations are described as appropriate.展开更多
Thrust bearing is a key component of the propulsion system of a ship. It transfers the propulsive forces from the propeller to the ship＇s hull, allowing the propeller to push the ship ahead. The performance of a thru...Thrust bearing is a key component of the propulsion system of a ship. It transfers the propulsive forces from the propeller to the ship＇s hull, allowing the propeller to push the ship ahead. The performance of a thrust bearing pad is critical. When the thrust bearing becomes damaged, it can cause the ship to lose power and can also affect its operational safety. For this paper, the distribution of the pressure field of a thrust pad was calculated with numerical method, applying Reynolds equation. Thrust bearing properties for loads were analyzed, given variations in outlet thickness of the pad and variations between the load and the slope of the pad. It was noticed that the distribution of pressure was uneven. As a result, increases of both the outlet thickness and the slope coefficient of the pad were able to improve load beating capability.展开更多
The geometry of a landslide dam is an important component of evaluating dam stability.However,the geometry of a natural dam commonly cannot be obtained immediately with field investigations due to their remote locatio...The geometry of a landslide dam is an important component of evaluating dam stability.However,the geometry of a natural dam commonly cannot be obtained immediately with field investigations due to their remote locations.A rapid evaluation model is presented to estimate the geometries of natural dams based on the slope of the stream,volume of landslides,and the properties of the deposit.The proposed model uses high resolution satellite images to determine the geometry of the landside dam.These satellite images are the basic information to a preliminary stability analysis of a natural dam.This study applies the proposed method to two case studies in Taiwan.One is the earthquakeinduced Lung-Chung landslide dam in Taitung,and the second is the rainfall-induced Shih-Wun landslide dam in Pingtung.展开更多
The purpose of this study was to analyze and synthesize a concept of caring in nursing professionals. The Ethnographic Delphi Future Research （EDFR） contained two phases： Phase 1： The analysis and synthesis of the...The purpose of this study was to analyze and synthesize a concept of caring in nursing professionals. The Ethnographic Delphi Future Research （EDFR） contained two phases： Phase 1： The analysis and synthesis of the concept of caring theory in nursing professionals from the literature, research and interviews. The participants were an expert in education, two nurses, two patients and two members of the patients＇ families. The research instrument was a semi-structural questionnaire. The data were analyzed by content analysis and categorized; and Phase 2： The selection of the expressions of caring behavior and guidelines for promotion of caring behavior in new nurses. The participants were two experts in education, eight experts in nursing administration and eight experts in nursing practice. The research instruments were three questionnaires. The data from the first Delphi technique were analyzed by the experts＇ recommendations. The data from the second and third Delphi technique were analyzed by the median and interquartile range of each behavior and consensus. The findings showed the main contents of caring that contained six components as follows： kindness, understanding worth and showing respect, professional relationship, professional competency, professional ethics, and holistic care. The training was a method for promotion of caring behavior. Additionally, in the the first Delphi technique, the experts approved all of the components of caring behavior and the guidelines for promotion of caring behavior as identified in the researchers＇ concepts. However, the researchers＇ concepts were developed 54 caring behaviors while the experts＇ opinion were 50 caring behaviors. In the second and third Delphi technique, all items of caring behaviors get consensus shown by interquartile range not more than 1.5 and the median since 3.5.展开更多
文摘Coal preparation is an integral part of the coal commodity supply chain. This stage of post-mining, pre-utilization beneficiation uses low-cost separation technologies to remove unwanted mineral matter and moisture which hinder the value of the coal product. Coal preparation plants typically employ several parallel circuits of cleaning and dewatering operations, with each circuit designed to optimally treat a specific size range of coal. Recent innovations in coal preparation have increased the efficiency and capac- ity of individual unit operations while reinforcing the standard parallel cleaning approach. This article, which describes the historical influences and state-of-the-art design for the various coal preparation unit operations, is organized to distinguish between coarse/intermediate coal cleaning and fine/ultrafine coal cleaning. Size reduction, screening, classification, cleaning, dewatering, waste disposal unit operations are particularly highlighted, with a special focus on the LI.S. design philosophy. Notable differences between the U.S. and international operations are described as appropriate.
基金Supported by the Natural Science Foundation of China under Grant No.50675162the Program of Introducing Talents of Discipline to Universities under Grant No.B08031the Key Project of Hubei Province Science & Technology Fund under Grant No.2008CAD027
文摘Thrust bearing is a key component of the propulsion system of a ship. It transfers the propulsive forces from the propeller to the ship＇s hull, allowing the propeller to push the ship ahead. The performance of a thrust bearing pad is critical. When the thrust bearing becomes damaged, it can cause the ship to lose power and can also affect its operational safety. For this paper, the distribution of the pressure field of a thrust pad was calculated with numerical method, applying Reynolds equation. Thrust bearing properties for loads were analyzed, given variations in outlet thickness of the pad and variations between the load and the slope of the pad. It was noticed that the distribution of pressure was uneven. As a result, increases of both the outlet thickness and the slope coefficient of the pad were able to improve load beating capability.
基金supported by National Science Council,Taiwan,China.The project name is Numerical Approach to Estimate the Stability and Deformation Response of Landslide Dams(NSC99-2625-M-006-004)and Modeling of The Compound Disaster in Hsiaolin Village(NSC99-2218-E-006-238)
文摘The geometry of a landslide dam is an important component of evaluating dam stability.However,the geometry of a natural dam commonly cannot be obtained immediately with field investigations due to their remote locations.A rapid evaluation model is presented to estimate the geometries of natural dams based on the slope of the stream,volume of landslides,and the properties of the deposit.The proposed model uses high resolution satellite images to determine the geometry of the landside dam.These satellite images are the basic information to a preliminary stability analysis of a natural dam.This study applies the proposed method to two case studies in Taiwan.One is the earthquakeinduced Lung-Chung landslide dam in Taitung,and the second is the rainfall-induced Shih-Wun landslide dam in Pingtung.
文摘The purpose of this study was to analyze and synthesize a concept of caring in nursing professionals. The Ethnographic Delphi Future Research （EDFR） contained two phases： Phase 1： The analysis and synthesis of the concept of caring theory in nursing professionals from the literature, research and interviews. The participants were an expert in education, two nurses, two patients and two members of the patients＇ families. The research instrument was a semi-structural questionnaire. The data were analyzed by content analysis and categorized; and Phase 2： The selection of the expressions of caring behavior and guidelines for promotion of caring behavior in new nurses. The participants were two experts in education, eight experts in nursing administration and eight experts in nursing practice. The research instruments were three questionnaires. The data from the first Delphi technique were analyzed by the experts＇ recommendations. The data from the second and third Delphi technique were analyzed by the median and interquartile range of each behavior and consensus. The findings showed the main contents of caring that contained six components as follows： kindness, understanding worth and showing respect, professional relationship, professional competency, professional ethics, and holistic care. The training was a method for promotion of caring behavior. Additionally, in the the first Delphi technique, the experts approved all of the components of caring behavior and the guidelines for promotion of caring behavior as identified in the researchers＇ concepts. However, the researchers＇ concepts were developed 54 caring behaviors while the experts＇ opinion were 50 caring behaviors. In the second and third Delphi technique, all items of caring behaviors get consensus shown by interquartile range not more than 1.5 and the median since 3.5.
