What can we learn from the PISA research about the factors and parameters affecting the success of student achievements in mathematics? A Comparative study between Israel and Finland.

"Abstract. There is a crisis of many years in Israel in the subject of mathematics learning. In the last PISA tests, conducted by the OECD during the last ten years, Israel is placed 39-41 among all the countries participated the research. It was also found that all the years Israel ""won"" to be one of the first three countries with the highest grade distribution among all the countries and economic entities participating in general and among OECD countries in particular. In addition, it was found that rate of Israeli students who fail the mathematics test is one of the highest in the organization countries. The goal of this research is comparing students’ achievements in the Israeli education system and in the Finnish education system, which is considered a system with excellent achievements in mathematics and low-grade distribution rate in general and in mathematics grades in particular. This comparison is aimed to identify the Israeli education system's problems and learn the lessons to improve it. This article discusses the question what is the main success factor in mathematics in Israel compared to Finland according to the 2015 PISA test results and what can be learned from this difference? In this paper I have based on my research findings in which I analyzed the correlation between the PISA questionnaires and student achievement in mathematics."

LATE AND UNEQUAL: MEASURING ENROLMENTS AND RETENTION IN BRAZILIAN EDUCATION, 1933-2010

ABSTRACT This paper presents a new dataset of enrolment rates and grade distribution ratios (GDR) in Brazil between 1933 and 2010, in addition to enrolment rates and GDR of Brazilian states from 1955 to 2010. To our knowledge, there are no previous estimates of enrolment rates by states for such a long period in Brazil. Enrolment rates and GDR in northern and north-eastern states were meagre and comparable to the lowest Latin American performers, and even the most advanced Brazilian states lagged behind the early leaders of the region, such as Argentina and Uruguay, until the turn of the century. Given a certain enrolment rate, Brazilian states were expected to present lower GDR compared to Latin American countries on average.

The Relationship Between Learning Mode and Student Performance in an Undergraduate Elementary Statistics Course in the United States

Faculty have conducted many studies on the relationship between learning mode and student performance but few researchers have evaluated final grades, grade distribution, and pass rates in a sophomore introductory statistics course with a non-traditional student population who self-selected the learning mode from among different course sections. Accordingly, we examined 307 end-of-course grades from four different modes of instruction: (a) online, (b) videosynchronous learning classroom, (c) videosynchronous learning home, and (d) traditional classroom in an introductory statistics course. All data on grades, which included pass rate and grade distribution, were collected from the nine-week January 2019 term. All learning modes used the same text, syllabus, assignments, quizzes, and tests. In this study, learning mode was not significantly related to end-of-course score, final grade distribution, or pass rate. Future researchers should explore the impacts of gender, instructor quality, different term lengths, and the standardized use of textbooks and syllabi on student performance when exploring the impact of learning mode on grades, grade distribution, and pass rates.

106 Effects of Revalor-XH and combination Revalor-IH/Revalor-200 on Yearling Heifer Growth Performance and Carcass Characteristics

A commercial feedlot trial utilizing 870 crossbred heifers (initial BW = 322; SD = 9 kg) examined two implant strategies on growth performance and carcass characteristics. Treatments included: 1) Revalor-IH on d 1 (80 mg trenbalone acetate (TBA)/8 mg estradiol (E2), noncoated) and re-implanted with Revalor-200 on d 101 (200 mg TBA/20 mg E2, noncoated (REV-IH/200); or 2) Revalor-XH on d 1 (200 mg TBA/20 mg E2, partially coated (REV-XH). There were no differences (P > 0.23) observed for live performance including final BW, DMI, ADG, and feed efficiency between implant treatments. There were no differences (P ≥ 0.17) in carcass-adjusted final BW or ADG between implant strategies. There were no differences (P ≥ 0.28) observed for DMI before or after re-implanting for heifers given REV-IH/200 compared to heifers given REV-XH. Heifers implanted with REV-IH/200 had greater carcass-adjusted feed efficiency compared to REV-XH (0.156 vs. 152; P = 0.03). Heifers implanted with REV-IH/200 had larger LM area compared to heifers with REV-XH (88.4 vs. 83.9 cm2; P < 0.01). Calculated yield grade was lower for heifers implanted with REV-IH/200 compared to heifers implanted with REV-XH (3.75 vs. 3.89; P < 0.01). Hot carcass weights, dressing percent, marbling, and 12th rib back fat were not different (P ≥ 0.11) among treatments. Heifers implanted with REV-IH/200 had a shift towards lower USDA yield grade distribution compared to REV-XH implanted heifers (P = 0.05). The REV-IH/200 combination provided 280 mg of TBA and 28 mg E2, while total active ingredient dose for REV-XH was 200 mg TBA and 20 mg E2. Therefore, minimal differences were observed in carcass-adjusted feed efficiency, LM area, and calculated yield grade between REV-IH/200 and the partially coated REV-XH implant.

108 Effect of Revalor-XH, Revalor-200, and combination Revalor-IH/Revalor-200 on Yearling Heifer Growth Performance and Carcass Characteristics

A commercial feedlot trial utilizing 1,728 crossbred heifers (initial BW = 410; SD = 10 kg) examined three implant strategies on growth performance and carcass characteristics. Treatments included: 1) Revalor-200 (REV-200) on d 1; 2) Revalor-IH on d 1 and Revalor-200 on d 56 (REV-IH/200; range 54-58 d) to target approximately 80 d with terminal implant; and 3) Revalor-XH (REV-XH) on d 1. Heifers implanted with REV-IH/200 combination had greater carcass-adjusted final BW and G:F compared to REV-200 and REV-XH (637 vs. 630 and 630 kg; 0.146 vs. 0.140 and 0.140, respectively; P ≤ 0.05). There were no differences (P ≥ 0.24) observed for live performance including final BW, DMI, or ADG on a live basis among implant strategies. Hot carcass weights and LM area improved for REV-IH/200 implanted heifers relative to REV-200 and REV-XH implanted heifers (397 vs. 393 and 393 kg; 90.9 vs. 87.7 and 88.7 cm2, respectively; P ≤ 0.05). Dressing percent was greater for REV-IH/200 implanted heifers compared to REV-200 and REV-XH (62.7 vs. 62.1 and 62.2 %, respectively; P = 0.01). Marbling score and 12th-rib fat thickness were not different (P ≥ 0.12) among implant treatments. Calculated yield grades improved for REV-IH/200 compared to REV-200 (3.63 vs. 3.82, respectively; P = 0.05). Heifers implanted with REV-IH/200 had a significant (P < 0.01) shift to a lower calculated yield grade distribution compared to REV-200 and REV-XH implanted heifers. The REV-IH/200 combination provided 280 mg of trenbolone acetate (TBA) and 28 mg estradiol (E2), while total active ingredient doses for REV-200 and REV-XH are 200 mg TBA and 20 mg E2. Thus, the greater concentration of TBA and E2 provided by REV-IH/200 combination improved carcass adjusted growth and carcass performance compared to the non-coated REV-200 implant and partially coated REV-XH implant.

Comminution Effects on Mineral-Grade Distribution: The Case of an MVT Lead-Zinc Ore Deposit

Every mining operation is followed by a beneficiation process aimed at delivering quality materials to the transformation industry. Mainly, in order to separate valuable minerals from gangue in mineral processing, the crushing and grinding of extracted ore are crucial operations for the following separation steps. Comminution is the most energy-consuming operation in mining, and the quality of the results is strictly related to the characteristic of the material under treatment, the type of equipment used in comminution, and the circuit design adopted. A preliminary study was performed in order to understand the crushing behavior under different comminution forces of a high-grade mixed Zn-Pb sulfide ore sample, collected in a Mississippi-Valley Type (MVT) deposit, and the distribution of the target minerals among the products of the process. Ore samples were examined and characterized through thin section observation and SEM analyses for the determination of grain size and texture features, while X-ray powder diffraction (XRPD) quantitative analyses were performed for the definition of target mineral concentrations of comminuted product samples. The selected crushing and grinding circuit comprised lab-scale equipment. For each stage of the process, products below the estimated free-grain size threshold were collected, and particle size analyses were carried out. Comminution products were divided into size distribution classes suitable for further separation operations, and XRPD analyses showed a mineral-grade distribution varying with the dimensions of the products. Characterization of the ore material after crushing and grinding force applications in terms of the distribution of target minerals among different-sized classes was achieved. The important trends highlighted should be considered for further investigation related to an efficient separation.

The Study and Analysis of Sinter Ores` Fragmentation Situation after Times Continued Drum Test

The article concludes the drum index and wear index of sinter ores by times continued drum test. Based on the test results, we analysis the fragmentation situation of sinter ores and the principle which effects the grade distribution under drum test. The results show that after drum test, the quality of sinter ores between 0.00-5.00mm and 10.00-16.00mm rises apparently, while other part all get lower. What`s more, when the times of drum test are same, the powdery degree will get bigger if the time is longer. When the time of drum test is same, the powdery degree will get bigger if the times are more. When the times and times are all the same, the powdery degree will be closely, which shows the results fits the Experimental errors.