Our Solar System contains eight planets and their respective natural satellites excepting the inner two planets Mercury and Venus. A satellite hosted by a given Planet is well protected by the gravitational pertubatio...Our Solar System contains eight planets and their respective natural satellites excepting the inner two planets Mercury and Venus. A satellite hosted by a given Planet is well protected by the gravitational pertubation of much heavier planets such as Jupiter and Saturn if the natural satellite lies deep inside the respective host Planet Hill sphere. Each planet has a Hill radius a<sub>H</sub> and planet mean radius R<sub>P </sub>and the ratio R<sub>1</sub>=R<sub>P</sub>/a<sub>H</sub>. Under very low R<sub>1 </sub>(less than 0.006) the approximation of CRTBP (centrally restricted three-body problem) to two-body problem is valid and planet has spacious Hill lobe to capture a satellite and retain it. This ensures a high probability of capture of natural satellite by the given planet and Sun’s perturbation on Planet-Satellite binary can be neglected. This is the case with Earth, Mars, Jupiter, Saturn, Neptune and Uranus. But Mercury and Venus has R<sub>1</sub>=R<sub>P</sub>/a<sub>H</sub> =0.01 and 5.9862 × 10<sup>-3</sup> respectively hence they have no satellites. There is a limit to the dimension of the captured body. It must be a much smaller body both dimensionally as well masswise. The qantitative limit is a subject of an independent study.展开更多
Testing is a means of enabling quality of teachers' teaching and acquisition of students' language learning. Considering the problems existing in the current English education and testing system, teachers shou...Testing is a means of enabling quality of teachers' teaching and acquisition of students' language learning. Considering the problems existing in the current English education and testing system, teachers should try to improve the validity and reliability of English language testing,which should cover 5 skills: the competence of listening, speaking, reading, writing and translation.展开更多
The paper dealswith the problemsin reading testing papers. The author proposessome possible solutions, such ascov- ering more cognitive skillsbeing tested, increasing more text types, adding some other testing item ty...The paper dealswith the problemsin reading testing papers. The author proposessome possible solutions, such ascov- ering more cognitive skillsbeing tested, increasing more text types, adding some other testing item types.展开更多
This paper presents a new class of test procedures for two-sample location problem based on subsample quantiles. The class includes Mann-Whitney test as a special case. The asymptotic normality of the class of tests p...This paper presents a new class of test procedures for two-sample location problem based on subsample quantiles. The class includes Mann-Whitney test as a special case. The asymptotic normality of the class of tests proposed is established. The asymptotic relative performance of the proposed class of test with respect to the optimal member of Xie and Priebe (2000) is studied in terms of Pitman efficiency for various underlying distributions.展开更多
AIM: To evaluate the technical failures of the Bravo pH test in a population with nonerosive gastroesophageal reflux disease. METHODS: Over the course of a year, we prospectively studied a population of 66 nonerosive ...AIM: To evaluate the technical failures of the Bravo pH test in a population with nonerosive gastroesophageal reflux disease. METHODS: Over the course of a year, we prospectively studied a population of 66 nonerosive reflux disease patients who received a Bravo pH test. The number and frequency of all technical failures were documented, quantified and analyzed. RESULTS: A total of 66 patients, with a mean age of 41.7 years, were studied. Technical failures occurred in 15.15% of the sample. The most frequent failures were due to poor data reception (4.5%), early dislodgement (4.5%) and capsule removal (6.1%). CONCLUSION: The Bravo capsule pH test involves a low but non-negligible rate of technical problems, a fact that must always be considered by physicians.展开更多
Two new regularization algorithms for solving the first-kind Volterra integral equation, which describes the pressure-rate deconvolution problem in well test data interpretation, are developed in this paper. The main ...Two new regularization algorithms for solving the first-kind Volterra integral equation, which describes the pressure-rate deconvolution problem in well test data interpretation, are developed in this paper. The main features of the problem are the strong nonuniform scale of the solution and large errors (up to 15%) in the input data. In both algorithms, the solution is represented as decomposition on special basic functions, which satisfy given a priori information on solution, and this idea allow us significantly to improve the quality of approximate solution and simplify solving the minimization problem. The theoretical details of the algorithms, as well as the results of numerical experiments for proving robustness of the algorithms, are presented.展开更多
目的探讨以问题为基础的教学法(problem based learning,PBL)联合以案例为基础的教学法(case based learning,CBL)在儿童肺功能专科进修培训中的应用效果。方法以2020年1月—2022年12月25名在四川大学华西第二医院肺功能专科的进修人员...目的探讨以问题为基础的教学法(problem based learning,PBL)联合以案例为基础的教学法(case based learning,CBL)在儿童肺功能专科进修培训中的应用效果。方法以2020年1月—2022年12月25名在四川大学华西第二医院肺功能专科的进修人员为调查对象,应用PBL联合CBL教学法,比较进修前后的理论知识与实际操作水平、胜任力水平,并调查进修人员对培训的满意度。结果经过一段时间理论和实践的培训,进修人员理论知识和实践技能操作水平以及胜任力水平较进修前均得到较大提升,培训前理论知识水平、实际操作和胜任力水平评分分别为(22.48±9.52)分、(15.40±5.97)分和(21.04±6.47)分,培训后理论知识水平、实际操作和胜任力水平评分分别为(75.00±24.00)分、(58.84±19.44)分和(65.32±17.39)分,培训前后差异有统计学意义(P<0.05)。肺功能检测进修人员对肺功能检测室整体工作环境比较满意。结论在PBL联合CBL教学法模式下,进修人员的理论知识与实际操作水平均有不同程度的提高,胜任力水平有较大提升,PBL联合CBL教学法可有效提高肺功能专科进修培训效果,肺功能检测应不断规范培训流程,完善肺功能检测进修体系,提升肺功能检测进修人员综合素质与学习满意度。展开更多
文摘Our Solar System contains eight planets and their respective natural satellites excepting the inner two planets Mercury and Venus. A satellite hosted by a given Planet is well protected by the gravitational pertubation of much heavier planets such as Jupiter and Saturn if the natural satellite lies deep inside the respective host Planet Hill sphere. Each planet has a Hill radius a<sub>H</sub> and planet mean radius R<sub>P </sub>and the ratio R<sub>1</sub>=R<sub>P</sub>/a<sub>H</sub>. Under very low R<sub>1 </sub>(less than 0.006) the approximation of CRTBP (centrally restricted three-body problem) to two-body problem is valid and planet has spacious Hill lobe to capture a satellite and retain it. This ensures a high probability of capture of natural satellite by the given planet and Sun’s perturbation on Planet-Satellite binary can be neglected. This is the case with Earth, Mars, Jupiter, Saturn, Neptune and Uranus. But Mercury and Venus has R<sub>1</sub>=R<sub>P</sub>/a<sub>H</sub> =0.01 and 5.9862 × 10<sup>-3</sup> respectively hence they have no satellites. There is a limit to the dimension of the captured body. It must be a much smaller body both dimensionally as well masswise. The qantitative limit is a subject of an independent study.
文摘Testing is a means of enabling quality of teachers' teaching and acquisition of students' language learning. Considering the problems existing in the current English education and testing system, teachers should try to improve the validity and reliability of English language testing,which should cover 5 skills: the competence of listening, speaking, reading, writing and translation.
文摘The paper dealswith the problemsin reading testing papers. The author proposessome possible solutions, such ascov- ering more cognitive skillsbeing tested, increasing more text types, adding some other testing item types.
文摘This paper presents a new class of test procedures for two-sample location problem based on subsample quantiles. The class includes Mann-Whitney test as a special case. The asymptotic normality of the class of tests proposed is established. The asymptotic relative performance of the proposed class of test with respect to the optimal member of Xie and Priebe (2000) is studied in terms of Pitman efficiency for various underlying distributions.
文摘AIM: To evaluate the technical failures of the Bravo pH test in a population with nonerosive gastroesophageal reflux disease. METHODS: Over the course of a year, we prospectively studied a population of 66 nonerosive reflux disease patients who received a Bravo pH test. The number and frequency of all technical failures were documented, quantified and analyzed. RESULTS: A total of 66 patients, with a mean age of 41.7 years, were studied. Technical failures occurred in 15.15% of the sample. The most frequent failures were due to poor data reception (4.5%), early dislodgement (4.5%) and capsule removal (6.1%). CONCLUSION: The Bravo capsule pH test involves a low but non-negligible rate of technical problems, a fact that must always be considered by physicians.
文摘Two new regularization algorithms for solving the first-kind Volterra integral equation, which describes the pressure-rate deconvolution problem in well test data interpretation, are developed in this paper. The main features of the problem are the strong nonuniform scale of the solution and large errors (up to 15%) in the input data. In both algorithms, the solution is represented as decomposition on special basic functions, which satisfy given a priori information on solution, and this idea allow us significantly to improve the quality of approximate solution and simplify solving the minimization problem. The theoretical details of the algorithms, as well as the results of numerical experiments for proving robustness of the algorithms, are presented.
文摘目的探讨以问题为基础的教学法(problem based learning,PBL)联合以案例为基础的教学法(case based learning,CBL)在儿童肺功能专科进修培训中的应用效果。方法以2020年1月—2022年12月25名在四川大学华西第二医院肺功能专科的进修人员为调查对象,应用PBL联合CBL教学法,比较进修前后的理论知识与实际操作水平、胜任力水平,并调查进修人员对培训的满意度。结果经过一段时间理论和实践的培训,进修人员理论知识和实践技能操作水平以及胜任力水平较进修前均得到较大提升,培训前理论知识水平、实际操作和胜任力水平评分分别为(22.48±9.52)分、(15.40±5.97)分和(21.04±6.47)分,培训后理论知识水平、实际操作和胜任力水平评分分别为(75.00±24.00)分、(58.84±19.44)分和(65.32±17.39)分,培训前后差异有统计学意义(P<0.05)。肺功能检测进修人员对肺功能检测室整体工作环境比较满意。结论在PBL联合CBL教学法模式下,进修人员的理论知识与实际操作水平均有不同程度的提高,胜任力水平有较大提升,PBL联合CBL教学法可有效提高肺功能专科进修培训效果,肺功能检测应不断规范培训流程,完善肺功能检测进修体系,提升肺功能检测进修人员综合素质与学习满意度。
