scholarly journals Common burdock (Arctium minus): a common weed of nonarable land in Orestiada, Greece

2015 ◽  
Vol 8 (1) ◽  
pp. 15-20 ◽  
Author(s):  
C.A. Damalas ◽  
C. Alexoudis ◽  
S.D. Koutroubas
Keyword(s):  
Morphological Traits ◽  
Arable Land ◽  
Seed Number ◽  
Phenological Stages ◽  
Rural Settings ◽  
The Mean ◽  
Second Year ◽  
Black Seeds ◽  
Insight Into ◽  
Arctium Minus

Summary Common burdock (Arctium minus) is a common biennial weed of non-arable land in typical rural settings of Orestiada, Greece. The aim of this study was to describe the basic morphological traits of this species throughout the main phenological stages of its life cycle and to obtain some insight into its growth and productivity in Orestiada. Based on our observations, the plants occurred most commonly in moist and fertile soils, usually as isolated individuals or in small patches near the parent plants. The species is characterized by its large basal ‘elephant-ear’ leaves during the vegetative stage, appearing in alternate arrangement, with irregularly wavy and non-toothed edges, as well as with long hollow stalks forming a noticeable furrow on the top. By monitoring individual plants, it was found that fl owering (in the second year of growth) mostly occurred from late June up to early August. The fl owers were purple, occurring in bristly heads at the top of the stem. The bristly heads formed a fruit, containing small black seeds. The average number of capitula per plant, from randomly selected populations in Orestiada, was found to be 69.7 and 57.7 respectively, whereas the mean seed number per capitulum reached 30.3 and 33.3 seeds, respectively

IMPROVING STUDENT’S VOCABULARY ACHIEVEMENT THROUGH “MAKE A MATCH METHOD”

2013 ◽  
Vol 2 (4) ◽  
Author(s):  
Ade Iriyani And Sortha Silitonga
Keyword(s):  
Action Research ◽  
Quantitative Data ◽  
Qualitative Data ◽  
English Teacher ◽  
Match Method ◽  
Class Viii ◽  
The Mean ◽  
Second Year ◽  
Teacher Use ◽  
Vocabulary Achievement

The objective of the study is to find out if the students’ vocabulary achievement improved through Make a Match Method. The research of this study was conducted by using action research. The subjects of this study were the second year students of MTs Swasta Al-Badar Tanjungbalai class VIII consisted of 31 students. The research was conducted in two cycles and every cycle consisted of three meetings. Quantitative and qualitative instruments were used to gather the data. Quantitative data was taken from the students’ score in vocabulary mastery, while qualitative data was taken from diary notes, observation sheets and questionnaire sheets. Based on the data, the students’ scores got improvement in every cycle. In test I, the mean of the students’ score was 59 while test II, the mean of the students’ score was 70.5 and in test III the mean of the students’ score was 77.3. It was found that the teaching vocabulary through Make a Match Method improve the students’ vocabulary Achievement. It is suggested that English teacher use Make a Match Method as one of alternatives method in teaching vocabulary.

Some Explicit Results for the Mean Spherical Approximation for Mixtures of Yukawa Fluids

2008 ◽  
Vol 73 (3) ◽  
pp. 424-438 ◽  
Author(s):  
Douglas J. Henderson ◽  
Osvaldo H. Scalise
Keyword(s):  
Integral Equation ◽  
Spherical Approximation ◽  
Mean Spherical Approximation ◽  
Inverse Temperature ◽  
Temperature Expansion ◽  
Yukawa Fluid ◽  
The Mean ◽  
Full Solution ◽  
Insight Into ◽  
Reasonable Model

The mean spherical approximation (MSA) is of interest because it produces an integral equation that yields useful analytical results for a number of fluids. One such case is the Yukawa fluid, which is a reasonable model for a simple fluid. The original MSA solution for this fluid, due to Waisman, is analytic but not explicit. Ginoza has simplified this solution. However, Ginoza's result is not quite explicit. Some years ago, Henderson, Blum, and Noworyta obtained explicit results for the thermodynamic functions of a single-component Yukawa fluid that have proven useful. They expanded Ginoza's result in an inverse-temperature expansion. Even when this expansion is truncated at fifth, or even lower, order, this expansion is nearly as accurate as the full solution and provides insight into the form of the higher-order coefficients in this expansion. In this paper Ginoza's implicit result for the case of a rather special mixture of Yukawa fluids is considered. Explicit results are obtained, again using an inverse-temperature expansion. Numerical results are given for the coefficients in this expansion. Some thoughts concerning the generalization of these results to a general mixture of Yukawa fluids are presented.

scholarly journals Cambial Activity and Phenology in Three Understory Species along an Altitude Gradient in Mexico

Forests ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 506
Author(s):  
Mayte S. Jiménez-Noriega ◽  
Lauro López-Mata ◽  
Teresa Terrazas
Keyword(s):  
Soil Temperature ◽  
Sierra Nevada ◽  
Cambial Activity ◽  
Life Forms ◽  
Dry Season ◽  
Vascular Cambium ◽  
Phenological Stages ◽  
Altitude Gradient ◽  
The Mean ◽  
Trees And Shrubs

The aims of this study were to evaluate the cambial activity and phenology of three species with different life forms (Alchemilla procumbens, Acaena elongata and Ribes ciliatum) along an altitudinal gradient and to establish which environmental variables (light, soil humidity and temperature) had the greatest influence on cambial activity and phenological stages. Over two years, data on phenology, growth and cambium were gathered every four weeks in three to six sites per species in Sierra Nevada, Mexico. The results showed that Ribes is the only species that terminates cambial activity with leaves senescence and is influenced by the minimum soil temperature. The light environment influenced the vegetative stages in Alchemilla (cryptophyte), while in Acaena (hemicryptophyte), the mean soil temperature explained the findings related to leaf area during the dry season and growth along the gradient. In the three species, the reproductive phase dominated for a longer period at higher elevations, especially in Alchemilla. Only Ribes, the phanerophyte, showed a similar cambial activity to other trees and shrubs. Although cambium reactivates during the dry season, no xylogenesis occurs. The three species varied during the time in which vascular cambium was active, and this was dependent on the altitude. Specifically, the variation was more rhythmic in Ribes and switched on and off in Alchemilla. It is likely that, depending on the life form, vascular cambium may be more or less susceptible to one or more climate factors.

Secondary Traumatization Among Social Work Students—The Contribution of Personal, Professional, and Environmental Factors

2020 ◽  
Author(s):  
Anat Ben-Porat ◽  
Shahar Shemesh ◽  
Ronit Reuven Even Zahav ◽  
Shelly Gottlieb ◽  
Tehila Refaeli
Keyword(s):  
Social Work ◽  
Social Work Students ◽  
Positive Contribution ◽  
Unique Contribution ◽  
Raising Awareness ◽  
The Mean ◽  
Explained Variance ◽  
Second Year ◽  
Self Differentiation

Abstract This study examined the rate of secondary traumatic stress (STS) among social work students and the contribution of background variables, personal resources (mastery and self-differentiation) and environmental resources (supervision satisfaction and peer support) to STS. The sample consisted of 259 social work students at three social work schools in Israel. The findings indicated that the mean level of STS was mild. Of the students, 36 per cent suffered STS to a mild extent, 19 per cent to a moderate extent and 18 per cent reported a ‘high to extreme extent’. A significant contribution was made by the student’s year of study, students in their second year of social work school suffered more severely from STS than did students in their first or third years. A positive contribution was made by the student’s level of exposure and a unique contribution was made by mastery and supervision satisfaction to the explained variance of STS. The findings highlight the importance of raising awareness of STS and its implications for social work students, as well as the necessity of helping students cope with this phenomenon. In addition, the study emphasises the significant role of supervisors in the training agencies and the importance of increasing students’ sense of mastery.

scholarly journals Multi-Temporal Arable Land Monitoring in Arid Region of Northwest China Using a New Extraction Index

2021 ◽  
Vol 13 (9) ◽  
pp. 5274
Author(s):  
Xinyang Yu ◽  
Younggu Her ◽  
Xicun Zhu ◽  
Changhe Lu ◽  
Xuefei Li
Keyword(s):  
Arable Land ◽  
Ground Truth ◽  
Northwest China ◽  
Hexi Corridor ◽  
Ground Truth Data ◽  
Land Protection ◽  
Promising Tool ◽  
Study Results ◽  
Multi Temporal ◽  
The Mean

Development of a high-accuracy method to extract arable land using effective data sources is crucial to detect and monitor arable land dynamics, servicing land protection and sustainable development. In this study, a new arable land extraction index (ALEI) based on spectral analysis was proposed, examined by ground truth data, and then applied to the Hexi Corridor in northwest China. The arable land and its change patterns during 1990–2020 were extracted and identified using 40 Landsat TM/OLI images acquired in 1990, 2000, 2010, and 2020. The results demonstrated that the proposed method can distinguish arable land areas accurately, with the User’s (Producer’s) accuracy and overall accuracy (kappa coefficient) exceeding 0.90 (0.88) and 0.89 (0.87), respectively. The mean relative error calculated using field survey data obtained in 2012 and 2020 was 0.169 and 0.191, respectively, indicating the feasibility of the ALEI method in arable land extracting. The study found that arable land area in the Hexi Corridor was 13217.58 km2 in 2020, significantly increased by 25.33% compared to that in 1990. At 10-year intervals, the arable land experienced different change patterns. The study results indicate that ALEI index is a promising tool used to effectively extract arable land in the arid area.

scholarly journals Study of Live Lecture Attendance, Student Perceptions and Expectations

2021 ◽  
Author(s):  
Johnathan Emahiser ◽  
John Nguyen ◽  
Cheryl Vanier ◽  
Amina Sadik
Keyword(s):  
Student Perceptions ◽  
Teaching Practices ◽  
First Year ◽  
First Year Students ◽  
Study Materials ◽  
Class B ◽  
Second Year ◽  
To Come ◽  
Perceptions And Expectations ◽  
Insight Into

AbstractDeclining lecture attendance has been an ongoing concern for educators involved in undergraduate medical education. A survey was developed (a) to gain insight into the reasons students skipped class, (b) to identify the type of study materials they were using, and (c) to determine what they thought would motivate them to come to class. The survey was sent to 317 first-year and second-year medical students, and 145 (45%) responded. Only 63% of first-year students and 53% of second-year students attended any lectures that were not mandatory. The attendance was higher for students who aspired to less competitive specialties such as pediatrics and family medicine. The most popular reasons for not coming to class were related to the efficiency of information intake and instructor or class style. The most heavily used resources (> 60%) were materials or recorded lectures provided by the instructor. The second-year students also heavily used outside study materials for Board exams, such as Pathoma (50%). Students’ ideas for what might increase their attendance suggest that they perceive that the lectures may not prepare them for Board exams, and they would like faculty to address Board related content more often in class and on assessments. Respondents also suggested that teaching practices might be improved through faculty development. Faculty awareness of and references to Board exam content, embedded in strong teaching practices, may help students find more value in live lectures. Carefully designed active learning sessions may change students’ minds regarding the relevance and value of these sessions.

A reduced-peak equivalence for queues with a mixture of light-tailed and heavy-tailed input flows

2003 ◽  
Vol 35 (03) ◽  
pp. 793-805 ◽  
Author(s):  
Sem Borst ◽  
Bert Zwart
Keyword(s):  
Service Rate ◽  
Opposite Case ◽  
Peak Rate ◽  
Workload Distribution ◽  
The Mean ◽  
Heavy Tailed ◽  
Insight Into

We determine the exact large-buffer asymptotics for a mixture of light-tailed and heavy-tailed input flows. Earlier studies have found a ‘reduced-load equivalence’ in situations where the peak rate of the heavy-tailed flows plus the mean rate of the light-tailed flows is larger than the service rate. In that case, the workload is asymptotically equivalent to that in a reduced system, which consists of a certain ‘dominant’ subset of the heavy-tailed flows, with the service rate reduced by the mean rate of all other flows. In the present paper, we focus on the opposite case where the peak rate of the heavy-tailed flows plus the mean rate of the light-tailed flows is smaller than the service rate. Under mild assumptions, we prove that the workload distribution is asymptotically equivalent to that in a somewhat ‘dual’ reduced system, multiplied by a certain prefactor. The reduced system now consists of only the light-tailed flows, with the service rate reduced by the peak rate of the heavy-tailed flows. The prefactor represents the probability that the heavy-tailed flows have sent at their peak rate for more than a certain amount of time, which may be interpreted as the ‘time to overflow’ for the light-tailed flows in the reduced system. The results provide crucial insight into the typical overflow scenario.

scholarly journals Analysis of Rural-Based Pre-Service Teachers Spatial-Visualisation Skills in Problem Solving in Vector Calculus Using MATLAB

2021 ◽  
Vol 16 (10) ◽  
pp. 125
Author(s):  
Godfred Amevor ◽  
Anass Bayaga ◽  
Michael J. Bosse
Keyword(s):  
Problem Solving ◽  
South African ◽  
Mathematical Problem ◽  
Interdisciplinary Studies ◽  
Problem Solving Skills ◽  
Vector Calculus ◽  
Rural Settings ◽  
Second Year ◽  
And Mathematics ◽  
Method Approach

In science, technology, engineering and mathematics (STEM) for instance, interdisciplinary studies have noted positive correlation between spatial-visualization (SV skills) and mathematical problem solving. The majority of these studies sharing a link between SV skills and problem solving were contextualized in urban settings and only a few in rural settings. This investigation analyses how rural-based pre-service teachers apply their SV skills in problem-solving in a South African university, in the context of vector calculus. One hundred rural-based pre-service teachers in a second year vector calculus class at University of Zululand (UNIZULU) were randomly selected into control and experimental groups. MATLAB was used as a dynamic visual tool to analyse how research participants applied their SV skills. A mixed method approach was employed in data collection (quantitative and qualitative). Our findings revealed that the rural-based pre-service teachers’ SV skills correlate with their problem-solving skills in vector calculus.

scholarly journals Enriching the Students Vocabulary Mastery in Speaking through Engage, Study, Activate Method

2019 ◽  
Vol 3 (1) ◽  
pp. 92
Author(s):  
Agus Rahmat
Keyword(s):  
Action Research ◽  
Diagnostic Test ◽  
Speaking Test ◽  
Research Population ◽  
Research Findings ◽  
The Mean ◽  
Second Year ◽  
Classroom Action Research ◽  
Research Show

<p>The objectives of this research are to find out the improvement of students’ vocabulary mastery and the student’s activeness in speaking through Engage, Study and Activate Method at the second year students of SMP Negeri 26Makassar. This research used Classroom Action Research that comprises of two cycles. The research population is the second year students of SMP Negeri 26 Makassar, and the sample of this research comprises of 25 students. The researcher obtained the data by using a speaking test and observation sheet.The results of this research show that there is animprovement in students' vocabularybetween the cycle I and Cycle II. The mean scores of students in the diagnostic test are 4.7 became 6.21 in cycle I, and after doing a revision in the cycle II the mean score in cycle II is7.45 then the activeness of students also improve from first meeting 53 % became 92% in the last meeting and achieved the minimal criteria, 65. The research findings indicate that the use of Engage, Study and Activate method can enrich the students’ vocabulary mastery and improve the students’ activeness in speaking.</p>

scholarly journals IMPROVING THE STUDENTS’ ABILITY TO WRITE DESCRIPTIVE TEXTS THROUGH FOUR SQUARE WRITING METHOD

2017 ◽  
Vol 6 (1) ◽  
pp. 82
Author(s):  
Ilmiah Ilmiah ◽  
Supardin Supardin ◽  
Hasnawati Latief ◽  
Muhammad Basri Dalle
Keyword(s):  
Action Research ◽  
Diagnostic Test ◽  
Action Observation ◽  
Teaching Writing ◽  
English Teacher ◽  
The Mean ◽  
Second Year ◽  
Classroom Action Research ◽  
Four Square ◽  
Planning Action

Writing is a difficult skill for the students at SMPN 26 Makassar. It could be seen from the result of a diagnostic test which showed the ability of the second year students of SMPN 26 Makassar in writing paragraphs was still poor. The students were unable to express their ideas well in making descriptive texts. The research used Classroom Action Research that consisted of planning, action, observation, and reflection. It conducted in two cycles in which each cycle comprised four meetings. The subjects of this research were 28 students of the second year students of SMPN 26 Makassar.The findings indicated that the students’ ability to write descriptive text in cycle 1 has not reached the score target because the mean score of the students was 66.52 that classified as “fairly good” whereas, In cycle 2 the students’ mean score was 75.26. It indicated that the score target has been reached and classified as “Good”. Therefore, the researcher suggested the English teacher apply Four Square Writing Method as one of the alternative ways of teaching writing subject in the classroom especially in teaching the descriptive text.

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