Обучение по природни науки и върхови технологии

2016/5, стр. 718 - 731

COLLEGE STUDENTS’ CONCEPTIONS OF NEWTONIAN MECHANICS: A CASE OF SURABAYA STATE UNIVERSITY INDONESIA

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Curriculum Matters
Учебно съдържание, планове, програми и стандарти

Introduction

For the past three decades, students’ understanding of scientific phenomena have been of considerable interest to science education researchers and science teachers. As students learn about the world surrounding them formally through school or their everyday experiences. However, their perception based on this situation created their own conception. Students’ conceptions might differ from those generally accepted by researchers as scientific concepts. Some scholars have used different terms to represent the students’ conception such as ‘preconceptions’ (Novak, 1977), ‘misconceptions’ (Clement et al., 1989; Helm, 1980), ‘alternative framework’ (Klammer, 1998; Driver, 1981), ‘children’s science ideas’ (Osborne et al., 1993; Gilbert et al., 1982), ‘mental models’ (Greca & Moreira, 2002), ‘tacit knowledge and children’s conceptions’ (Taber, 2013; Collins, 2010), and so forth.

For those students’ conception in science, physics was the main disciplined examined (Chiu et al., 2016). Therefore, there were some diagnostic instruments to identify the students’ conception in physics domain (e.g., Force Concept Inventory by Hestenes et al. (1992); Mechanic Baseline Test by Hestenes & Wells (1992); Energy and Momentum Conceptual Survey by Singh & Rosegrant (2003); Diagnosing and Interpreting Resistor Circuits by Engelhardt & Beichner (2004), etc.).

According to the constructivist learning theory, students come to class with the misconceptions which they shape up as a result of their interaction with the world. These misconceptions are affected by students’ way of interpreting and constructing new concepts (Boo & Watson, 2001). The pre-idea that being held by students are firm and not easily changeable although the scientific concept has been provided (Sencar & Eryilmaz, 2004). This statement highlights teachers’ role of detecting the misconceptions that exist between students and take precaution steps and alternatives in order to curb the phenomenon of misconceptions. Therefore, it is very important for a pre-service teacher not to have any misconceptions as is it will be inherited by their students.

The researchers believed that one study should be conducted to identify the misconception among college students as their role as pre-service teacher. Thus, the study was preliminary studies of conception possessed profile college student in mechanics using instruments: Force Concept Inventory (FCI) and Mechanics Baseline test (MBT), and identified the concept of supporting the cause of misconceptions. In order to answer the problem statement, researchers had developed a few research objectives which are to determine: (a) the level of misconceptions on Newtonian mechanics among college students, according to Force Concept Inventory (FCI) and (b) the level of misconceptions on Newtonian mechanics among college students according to Mechanics Baseline test (MBT).

Methodology

Participants of the study included 90 college physics students at Surabaya State University, Indonesia, which thirty (30) students for each level (Freshman, Sophomore, and Junior). The research used a descriptive quantitative approach by using instruments: FCI and MBT. The FCI instrument developed by Hestenes et al. (1992).2) The MBT instrument created by Hestenes & Wells (1992) and translated to Indonesia version by the first researcher. A data collection technique used written test (paper and pencil test) by providing instruments FCI and MBT, which consisted 30 items and 26 items, respectively. Data analysis used descriptive analysis of the percentage to determine the student’s conception of each item problem. The marking scheme made for the correct answers was one marks, and for incorrect answers zero marks were given. Next, from the calculation of the percentage of conception, can be identified the possibility of misconceptions on the basic physics concept. The percentage of misconception for every subtopics of the Newtonian concept was obtained by dividing the marks of the incorrect answers with the total items. The percentage of misconceptions for each item were compared to the misconception division level (Table 1). All data collected were analyzed descriptively and were presented in mean (average) and percentage.

Table 1. Misconception division level

PercentageLevel of misconception85-100very high (VH)70-84high (H)55-69moderate (M)40-54low (L)0-39very low (VL)Azman et al. (2013)

Results

Based on the results of student responses to the FCI instrument, the data were processed to obtain the following percentage of student truly conception (Table 2).

Table 2. Students’ truly conception of each FCI item

ItemStudents conception(%)Physics conceptsubtopicsJSF170*4010Accelerationindependentof weightKinds of force:Gravitation2100*200Accelerationindependentof weightKinds of force: gravitation3302030Accelerationindependentof weightKinds of force: gravitation470*030Impulsive forceThirds law540300Buoyant (pressure)Kinds of force: uidcontact650*50*60*First law: with noforceFirst law
ItemStudents conception(%)Physics conceptsubtopicsJSF770*70*40First law: with noforceFirst law8101030Second law:impulsive forceSecond law9404020Second law:impulsive forceSecond law1060*2020First law: speedconstantFirst law1120020GravitationKinds of force:Gravitation1290*70*30Parabolic trajectoryKinds of force:Gravitation13000GravitationKinds of force:Gravitation1450*50*10Parabolic trajectoryKinds of force:Gravitation154060*30Third law: forcontinuous forcesThird law1690*4050*Third law: forcontinuous forcesThird law1760*00Cancelling forcesSuperposition principle1860*400GravitationKinds of force:Gravitation1960*50*10Velocity discriminatedfrom positionKinematics2070*400Accelerateddiscriminated fromvelocityKinematics2120040Second law: constantaccelerationSecond law22202010Constant accelerationentails; changingspeedSecond law2310020First law: velocitydirection constantFirst law244050*40First law: speedconstantFirst law2560*60*10Cancelling forceSuperposition principle26101010Cancelling forceSuperposition principle27301030Friction opposesmotionKinds of force: Solidcontact2870*4020Third law: forimpulsive forceThird law
ItemStudents conception(%)Physics conceptsubtopicsJSF2970*70*40Third law: forimpulsive forceThird law3020020Air resistanceKinds of force: uidcontactAverage47.6730.3321.00

(Note: J = Junior, S=Sophomore, F= Freshman; * the percentage of students conception at least 50%)

The asterisk sign (*) on Table 2 indicates the percentage of students conception at least 50%. In general, most students performed very lacking in understanding of the all of the key concepts (less than 50%), except number 6 (Newton’s first law with no force). Overall, student’s conception on Newtonian mechanics based on FCI in Junior level better than Sophomore and Freshman. The average conception was 47.67%, 30.33%, and 21.00%, respectively. At FCI, the interval difference of the FCI’s conception between Junior and Sophomore was approximately 17%, then 9% between Sophomore and Freshman. The possibility reason was the level of course’s material in Junior has been very much and already took a mechanic-course. Therefore, they have more mature understanding of the concepts of Newtonian. Sophomore’s student only still armed with the knowledge of basic physics from the first year, yet have mastery of the material as much as the student in Junior, so that the lower of the conception level. However, Freshman students only used their knowledge from senior high school. This situation also consisted with their cognitive level, which will automatically owned conception would be better than the previous age.

Table 3. The level of Misconceptions among college students based on FCI

ConceptPercentage (%)Level ofMisconceptionJSFAverageKinematics35459558.33MNewton’s First Law54626460MNewton’s Second Law77.582.57578.33HNewton’s Third Law32586652LSuperposition Principle56.6776.6793.3375.56HKinds of Force:Solid contact70907076.67HFluid contact70859081.67HGravitation47.57087.568.33MAverage68.86MJ=Junior,S=Sophomore,Freshman;F=L=low,M=moderate,H=high)(Note:

Based on the Table 3, the overall level of misconception among college students on the subtopic of force and motion based on FCI instrument was moderate (68.86%). The highest levels of misconception are the subtopic of kinds of force with fluid contact (81.67%), Newton’s second law (78.33%), kinds of force with solid contact (76.67%), and the superposition principle (75.56%). At the moderate level of misconceptions the subtopic kinds of force: gravitation (68.33%), Newton’s first law (60%), and kinematics (58.33%). However, college students performed better in Newton’s third law with low level of misconception (52%).

Regarding the kinds of force with fluid contact and solid contact, students confused regarding the passive, impulsive and friction opposes motion. In addition, the concept of air resistance and buoyant (air pressure) also stood at the same situation as well as gravitation at the moderate level. Gravitation as part of kinds of force, students believed that air pressure contributes to gravity. The net force due to air pressure is actually upward (buoyant force) instead of downward, was hardly recognized by students (Hestenes et al., 1992).

Turning to the Newton second law, a particle will change its state of motion when it is acted on by an external force or active force. This law gives a specific way of determining how a body’s motion is changed by an external applied force: the particle’s time rate of change of momentum is equal to the externally applied force and takes place in the direction in which the force acts (Chow, 2013). Many students did not understand about the existence of active force. As Hestenes et al. (1992) underlined that this force is causal agents—they have the power to cause motion—to create the impetus and transfer it to other objects.

The next topic with high level of misconception is the superposition. When talking about superposition, the point of focus is on vector sum and cancelling forces. Vector sum and cancelling forces are being discussed in the subtopic of analyzing forces in equilibrium. Hestenes et al. (1992) stated that the common misconceptions regarding the superposition principle are that respondents tend to get confused with the action/reaction pair with the superposition of oppositely directed forces on a single object. This resolves that, respondents are applying a direct common sense of thinking as they unable to differentiate between two concepts.

Newton’s First Law states that if there is no force acting on a body, its state of motion will be unchanged. For Newton’s first law, many got uncertain about the definition and holds on common mistake by understanding that “if no net force acts on an object, the object must be at rest”. Relating to this confusion, common sense thinkers come out with two kinds of force, which known as impetus and active force. ‘Impetus’ was introduced back in the pre-Galilean times, which refers to ‘motive power’ or ‘intrinsic force’ that keeps things moving (Hestenes et al., 1992). This common sense totally disagreed with Newton’s First Law. Impetus theory, describes about the force that acts on an object. As a force acts on an object, the object gains a property called impetus. Although the force is not in contact with the object, the impetus remains in the object and keeps the object moving. As time passes, impetus decreases because of the resistance of medium or opposing forces and causes the object to come to a rest. This idea was propounded by one of the fifth-century philosophers, Philoponus, to explain projectile motion. These types of imaginative forces are used to explain projectile motion and motion of objects thrown upward. Referred to the impetus idea, some students also believe that gravity does not act until the impetus wears down. A research done by Azman et al. (2013) also showed a high level of misconceptions, especially in the Newton’s First Law concept among the physics pre-services teachers in Malaysia.

As for kinematic topic, the high percentage of misconceptions of kinematics showed that respondent unable to differentiate between three vital concepts which are position, velocity, and acceleration. In fact, the Force Concept Inventory succeeds in reflecting the ability of the university student in recognizing the vectorial nature of velocity and acceleration (Hestenes et al., 1992). A research done by Bayraktar (2009) also showed similarities with this research findings as the level of misconceptions among the pre-services teachers of Turkey were high.

At the low level, students confused about action reaction pairs. These findings in-lined with Bayraktar (2009) who found that student-teachers’ conceptions about Newton’s Third Law, on the other hand, were significantly better than those observed in other research done in other countries such as the US and Finland. Students often interpret the term “ interaction” by a “conflict metaphor”. The authors interpreted this result to imply that many students have difficulty in generalizing Newton’s Third Law to cover accelerated and uniform velocity cases both, and that, many students believe that Newton’s Third Law hold only in dynamic conditions. Difficulties in students’ understanding of Newton’s Third Law were observed in numerous other research studies as well. For example, Yeo & Zadnik (2000), who used several questions of the FCI as part of their test to detect students’ difficulties in understanding force and motion.

Table 4. Student’s conception of each MBT item

ItemStudents conception (%)Physics conceptJSF150*4010constant accelerationCA250*3010constant accelerationCA3201010constant accelerationCA470*70*20tangensial accelerationTA520030normal accelerationNA650*2060*free fallFF
710020superposition of forceSF8301010normal accelerationNA94000centripetal accelerationSA1010020Energy conservationEC1150*2010Energy conservationEC1210030action-reactionAR133050*10action-reactionAR1470*4010action-reactionAR15060*30momentum conservationMC16104010Impuls-momentumMC17101010average accelerationAA1802020average accelerationAA19101010superposition of forceSF2020010work-energyEC2160*60*30momentumMC2250*60*20Impuls-momentumMC2330300average accelerationAA2440010integrated displacementID25304020average velocityAV26102020free fallFFOverall30.0024.6216.92

(Note: J = Junior, S=Sophomore, F= Freshman; * the percentage of students conception at least 50%)

Table 4 presents that the respondents have a very low understanding regarding the basic concepts regarding kinematics: the kinds of acceleration, energy conservation, superposition force, action-reaction, and free fall. From all the basic concepts, supporting the concept actually involved is the mass, velocity, force, and acceleration. If connected with the concept of supporting experiencing misconceptions on the instrument FCI and MBT, then the concept of support that is not well understood is the concept of speed and acceleration. If this support concept can be inferred, then students will not experience an error or even do not know the concept when faced with questions which contains the basic concepts. Unlike the FCI, some computation is required in MBT, so students use more time in MBT than FCI (Antwi et al., 2011). The two tests (FCI and MBT) are complementary probes for understanding of the most basic Newtonian concepts.

A fairly low percentage of the conception of the three groups of respondents on average range in the range of 16% - 30%. It is not much different of the FCI instrument (21%-48%). Students’ conception in responding MBT instrument can be said to be very less, compared with the results on the instrument FCI. Table 4 also shows the average conception was 30.00%, 24.62%, and 16.92% for Junior, Sophomore, and Freshman, respectively. At MBT, the interval difference of the MBT’s conception between Junior and Sophomore was approximately 6% and 8% between Sophomore and Freshman. The possibility reason was the same as well as the conception to FCI aforementioned.

Table 5. The level of Misconceptions among college students based on MBT instrument

ConceptPercentage (%)Level ofMisconceptionJSFAverageKinematics75.28HLinier motion:78.33HConstant acceleration (CA)6073.339074.44HAverage acceleration (AA)86.67809085.56VHAverage Velocity (AV)70608070.00HIntegrated Displacement (ID)601009083.33HCurvilinier motion72.22HTangensial acceleration (TA)30308046.67LNormal acceleration (NA)75958083.33HCentripetal acceleration (SA)6010010086.67VHGeneral Principles76.32HSuperposition of force (SF)83.338086.6783.33HEnergy Conservation (EC)Energy conservationWork- energy73.3393.3386.6784.44HAction – reaction (AR)60808073.33HMomentum conservation (MC)Momentum conservationImpuls- momentum704577.564.17MSpecic Forces73.33HFree Fall (FF)70807073.33HAverage75.91H

(Note: J = Junior, S=Sophomore, F= Freshman; L=low, M=moderate, H=high,

VH=very high)

Table 5 describes the overall level of misconception among college students based on MBT instrument was high (75.91%). The highest levels of misconception were the topics of kinematics; both centripetal and average acceleration (86.67% and 85.56%, respectively). The other concepts in general principles (such as: energy conservation, superposition of force, free fall, and action-reaction), students also performed high level in misconception. At the moderate level of misconceptions, students indicated 64.17% misconception in momentum conservation. However, college students performed better in tangensial acceleration with low level of misconception (46.67 %).

Discussion

The findings of this study depict that students’ conceptions on Newtonian mechanics based on FCI instrument are very low. The overall level of misconception among college students on the subtopic of force and motion based on FCI instrument was moderate (68.86%). The highest levels of misconception are the subtopic of kinds of force with fluid contact (81.67%), Newton’s second law (78.33%), kinds of force with solid contact (76.67%), and the superposition principle (75.56%). In addition, college students also have a very low understanding regarding the basic concepts of the kinds of acceleration, kinematics, energy conservation, superposition force, action-reaction, and free fall by using MBT. The overall level of misconception among college students based on MBT instrument was high (75.91%). The highest levels of misconception were the topics of kinematics; both centripetal and average acceleration (86.67% and 85.56%, respectively). The other concepts in general principles (such as, energy conservation, superposition of force, free fall, action-reaction, and kinematics), students also performed high level in misconception. All these findings also in-lined with the following previous researches: (i) Confusion of position and velocity, and velocity and acceleration: students sometimes believe that there is a linear relationship between force and velocity (instead of force and acceleration). They expect a constant velocity from a constant force. When two objects are in the same position, students think that the velocities are the same (Bayraktar, 2009); (ii) Heavier objects fall faster: students believe that heavier objects fall faster than lighter ones (McDermott, 1984; Hestenes et al., 1992; Bayraktar, 2009; Luangrath et al., 2011); (iii) Impetus idea: students believe that, when a force acts on an object, the object gains, what is called, impetus. When the force does not act on the object any longer, the impetus is thought to remain but to diminish. The object continues to move until the initial “force” (impetus) is used up (Hestenes et al., 1992; Bayraktar, 2009), some students also believe in a circular impetus; (iv) Motion implies force: students think that a force is needed to keep an object moving. As a consequence, they think that it should be a force in the direction of motion (McDermott, 1984; Jimoyiannis & Komis, 2003; Bayraktar, 2009; Luangrath et al., 2011); (v) Dominance idea: students often interpret interaction via a conflict metaphor, where strength is attributed to those who are bigger, heavier, or more active. Objects with greater mass, or a more active object, is thought to exert a greater force (Bayraktar, 2009; Luangrath et al., 2011); (vi) Action-reaction pairs act on the same object: students think that the objects could be balanced in this way (Reach, 1992; Jimoyiannis & Komis, 2003).

In the current study, researchers only highlighted in the discussion of the level of understanding among college students on the physics concepts of force and motion in general by using FCI and MBT. The implication for college student as well as the pre-services teachers are those who are in the first row that will shape the future of the next generations, it is highly recommended in applying the style of teaching and learning on a more conceptual understanding as it can help in curbing the misconceptions phenomenon among the pre-services teachers. This is because the approach in the form of conceptual understanding can help pre-services teachers themselves learn physics concepts in a realistic and accurate understanding. The following step is to apply appropriate teaching methods to overcome the misconceptions. Tests for diagnosing the misconceptions such as the FCI, MBT, or various questioning techniques could be used in the process. Research related to misconceptions has shown that traditional teaching methods are not really effective in overcoming misconceptions (Saul & Redish, 1998). Suggested methods generally include interactive and constructive methods such as computer assisted instruction (Bernhard, 2000; Tao & Gunstone, 1999), and a variety of cooperative learning (Saul & Redish, 1998).

In addition, to improve the understanding of physics concepts we suggested that lecturers should implement teaching style of various situations, so that it can help pre-services teachers apply the concepts they learned and provide explanations for each of their answers for every concept questions. As Antwi et al. (2011) suggested that the interactive engagement (IE) approaches have a significant impact on students’ scores in both FCI and MBT. Some approaches like concept quiz, thinkshare present, conceptual and reasoning questions, group discussion, and tutorials were used in all the lessons (Hake, 1998). This could suggest that IE approaches could effectively improve students’ conceptual understanding and insightful problem solving in mechanics. Moreover, for helping researchers to portray the students’ reasoning behind their answers, two-tier test or three-tier test of mechanics can be considered.

Conclusion

There were some conclusions of the study. First, student’s conception on Newtonian mechanics based on FCI instrument indicated student in Junior level better than Sophomore and Freshman. The possibility reason was the level of course’s material in Junior has been very much and already took a completely mechanicscourse. Second, the overall level of misconception among college students on the subtopic of force and motion based on FCI instrument was moderate (68.86%). The highest levels of misconception are the subtopic of kinds of force with fluid contact (81.67%), Newton’s second law (78.33%), kinds of force with solid contact (76.67%), and the superposition principle (75.56%). Third, college students have a very low understanding regarding the basic concepts of the kinds of acceleration, kinematics, energy conservation, superposition force, action-reaction, and free fall by using MBT. Fourth, the overall level of misconception among college students based on MBT instrument was high (75.91%). The highest levels of misconception were the topics of kinematics; both centripetal and average acceleration (86.67% and 85.56%, respectively). The other concepts in general principles (such as: energy conservation, superposition of force, free fall, actionreaction, and kinematics), students also performed high level in misconception.

NOTES

1. The paper was presented at the 31st Annual International Conference of Association of Science Education Taiwan (ASET), Howard Beach Resort Kenting, Pingtung County, Taiwan, 10-12 December 2015.

2. Adopted to Indonesia case by Syuhendri, 2012.

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Пламена Боиклиева, 10 клас, Дафинка Юрчиева

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Симона Гочева, Майя Найденова

ХИМИЯ НА ЛЮТОТО

Марта Пенчева, Васка Сотирова

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Елица Нейкова, Елисавета Григорова, Майя Найденова

ХИМИЯ НA ПAРИТE

Игликa Кoлeвa, Eмилия Ивaнoвa

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Емил Мирчев, Галя Петрова

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Никола Урумов, Анелия Иванова

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Виктория Дечкова, Никола Велчев, Нели Иванова

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MATHEMATICAL MODELLING OF THE TRANSMISSION DYNAMICS OF PNEUMONIA AND MENINGITIS COINFECTION WITH VACCINATION

Deborah O. Daniel, Sefiu A. Onitilo, Omolade B. Benjamin, Ayoola A. Olasunkanmi

2024 година
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2023 година
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ПОДКАСТ – КОГА, АКО НЕ СЕГА?

Христо Чукурлиев

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2022 година
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METEOROLOGICAL DETERMINANTS OF COVID-19 DISEASE: A LITERATURE REVIEW

Z. Mateeva, E. Batchvarova, Z. Spasova, I. Ivanov, B. Kazakov, S. Matev, A. Simidchiev, A. Kitev

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MATHEMATICAL MODELLING OF THE TRANSMISSION MECHANISM OF PLAMODIUM FALCIPARUM

Onitilo S. A, Usman M. A., Daniel D. O. Odetunde O. S., Ogunwobi Z. O., Hammed F. A., Olubanwo O. O., Ajani A. S., Sanusi A. S., Haruna A. H.

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Станислав Сланев, Хафизе Шабан, Шебнем Шабан, Анета Маринова

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MAGNETIC PROPERTIES

Sofija Blagojević, Lana Vujanović, Andreana Kovačević Ćurić

„TAP, TAP WATER“ QUANTUM TUNNELING DEMONSTRATION

Katarina Borković, Andreana Kovačević Ćurić

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КОМЕТИТЕ – I ЧАСТ

Пенчо Маркишки

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DISTANCE LEARNING: HOMEMADE COLLOIDAL SILVER

Ana Sofía Covarrubias-Montero, Jorge G. Ibanez

2021 година
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STUDY OF COMPOSITIONS FOR SELECTIVE WATER ISOLATION IN GAS WELLS

Al-Obaidi S.H., Hofmann M., Smirnov V.I., Khalaf F.H., Alwan H.H.

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POTENTIAL APPLICATIONS OF ANTIBACTERIAL COMPOUNDS IN EDIBLE COATING AS FISH PRESERVATIVE

Maulidan Firdaus, Desy Nila Rahmana, Diah Fitri Carolina, Nisrina Rahma Firdausi, Zulfaa Afiifah, Berlian Ayu Rismawati Sugiarto

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INVESTIGATION OF 238U, 234U AND 210PO CONTENT IN SELECTED BULGARIAN DRINKING WATER

Bozhidar Slavchev, Elena Geleva, Blagorodka Veleva, Hristo Protohristov, Lyuben Dobrev, Desislava Dimitrova, Vladimir Bashev, Dimitar Tonev

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DEMONSTRATION OF DAMPED ELECTRICAL OSCILLATIONS

Elena Grebenakova, Stojan Manolev

2020 година
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ДОЦ. Д-Р МАРЧЕЛ КОСТОВ КОСТОВ ЖИВОТ И ТВОРЧЕСТВО

Здравка Костова, Елена Георгиева

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JACOB’S LADDER FOR THE PHYSICS CLASSROOM

Kristijan Shishkoski, Vera Zoroska

КАЛЦИЙ, ФОСФОР И ДРУГИ ФАКТОРИ ЗА КОСТНО ЗДРАВЕ

Радка Томова, Светла Асенова, Павлина Косева

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MATHEMATICAL MODELING OF 2019 NOVEL CORONAVIRUS (2019 – NCOV) PANDEMIC IN NIGERIA

Sefiu A. Onitilo, Mustapha A. Usman, Olutunde S. Odetunde, Fatai A. Hammed, Zacheous O. Ogunwobi, Hammed A. Haruna, Deborah O. Daniel

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WATER PURIFICATION WITH LASER RADIATION

Lyubomir Lazov, Hristina Deneva, Galina Gencheva

2019 година
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LASER MICRO-PERFORATION AND FIELDS OF APPLICATION

Hristina Deneva, Lyubomir Lazov, Edmunds Teirumnieks

ПРОЦЕСЪТ ДИФУЗИЯ – ОСНОВА НА ДИАЛИЗАТА

Берна Сабит, Джемиле Дервиш, Мая Никова, Йорданка Енева

IN VITRO EVALUATION OF THE ANTIOXIDANT PROPERTIES OF OLIVE LEAF EXTRACTS – CAPSULES VERSUS POWDER

Hugo Saint-James, Gergana Bekova, Zhanina Guberkova, Nadya Hristova-Avakumova, Liliya Atanasova, Svobodan Alexandrov, Trayko Traykov, Vera Hadjimitova

Бележки върху нормативното осигуряване на оценяването в процеса

БЕЛЕЖКИ ВЪРХУ НОРМАТИВНОТО ОСИГУРЯВАНЕ, НА ОЦЕНЯВАНЕТО В ПРОЦЕСА НА ОБУЧЕНИЕТО

ТЕХНОЛОГИЯ

Б. В. Тошев

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ON THE GENETIC TIES BETWEEN EUROPEAN NATIONS

Jordan Tabov, Nevena Sabeva-Koleva, Georgi Gachev

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CHEMOMETRIC ANALYSIS OF SCHOOL LIFE IN VARNA

Radka Tomova, Petinka Galcheva, Ivajlo Trajkov, Antoaneta Hineva, Stela Grigorova, Rumyana Slavova, Miglena Slavova

ЦИКЛИТЕ НА КРЕБС

Ивелин Кулев

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ПРИНЦИПИТЕ НА КАРИЕРНОТО РАЗВИТИЕ НА МЛАДИЯ УЧЕН

И. Панчева, М. Недялкова, С. Кирилова, П. Петков, В. Симеонов

UTILISATION OF THE STATIC EVANS METHOD TO MEASURE MAGNETIC SUSCEPTIBILITIES OF TRANSITION METAL ACETYLACETONATE COMPLEXES AS PART OF AN UNDERGRADUATE INORGANIC LABORATORY CLASS

Anton Dobzhenetskiy, Callum A. Gater, Alexander T. M. Wilcock, Stuart K. Langley, Rachel M. Brignall, David C. Williamson, Ryan E. Mewis

THE 100

Maria Atanassova, Radoslav Angelov

A TALE OF SEVEN SCIENTISTS

Scerri, E.R. (2016). A Tale of Seven Scientists and a New Philosophy of Science.

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DEVELOPMENT OF A LESSON PLAN ON THE TEACHING OF MODULE “WATER CONDUCTIVITY”

A. Thysiadou, S. Christoforidis, P. Giannakoudakis

AMPEROMETRIC NITRIC OXIDE SENSOR BASED ON MWCNT CHROMIUM(III) OXIDE NANOCOMPOSITE

Arsim Maloku, Epir Qeriqi, Liridon S. Berisha, Ilir Mazreku, Tahir Arbneshi, Kurt Kalcher

THE EFFECT OF AGING TIME ON Mg/Al HYDROTALCITES STRUCTURES

Eddy Heraldy, Triyono, Sri Juari Santosa, Karna Wijaya, Shogo Shimazu

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A CONTENT ANALYSIS OF THE RESULTS FROM THE STATE MATRICULATION EXAMINATION IN MATHEMATICS

Elena Karashtranova, Nikolay Karashtranov, Vladimir Vladimirov

SOME CONCEPTS FROM PROBABILITY AND STATISTICS AND OPPORTUNITIES TO INTEGRATE THEM IN TEACHING NATURAL SCIENCES

Elena Karashtranova, Nikolay Karashtranov, Nadezhda Borisova, Dafina Kostadinova

45. МЕЖДУНАРОДНА ОЛИМПИАДА ПО ХИМИЯ

Донка Ташева, Пенка Василева

2018 година
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ЗДРАВЕ И ОКОЛНА СРЕДА

Кадрие Шукри, Светлана Великова, Едис Мехмед

РОБОТИКА ЗА НАЧИНАЕЩИ ЕНТУСИАСТИ

Даниела Узунова, Борис Велковски, Илко Симеонов, Владислав Шабански, Димитър Колев

DESIGN AND DOCKING STUDIES OF HIS-LEU ANALOGUES AS POTENTIOAL ACE INHIBITORS

Rumen Georgiev, , Tatyana Dzimbova, Atanas Chapkanov

X-RAY DIFFRACTION STUDY OF M 2 Zn(TeО3)2 (M - Na, K) ТELLURIDE

Kenzhebek T. Rustembekov, Mitko Stoev, Aitolkyn A. Toibek

CALIBRATION OF GC/MS METHOD FOR DETERMINATION OF PHTHALATES

N. Dineva, I. Givechev, D. Tanev, D. Danalev

ELECTROSYNTHESIS OF CADMIUM SELENIDE NANOPARTICLES WITH SIMULTANEOUS EXTRACTION INTO P-XYLENE

S. S. Fomanyuk, V. O. Smilyk, G. Y. Kolbasov, I. A. Rusetskyi, T. A. Mirnaya

БИОЛОГИЧЕН АСПЕКТ НА РЕКАНАЛИЗАЦИЯ С ВЕНОЗНА ТРОМБОЛИЗА

Мариела Филипова, Даниела Попова, Стоян Везенков

CHEMISTRY: BULGARIAN JOURNAL OF SCIENCE EDUCATION ПРИРОДНИТЕ НАУКИ В ОБРАЗОВАНИЕТО VOLUME 27 / ГОДИНА XXVII, 2018 ГОДИШНО СЪДЪРЖАНИЕ СТРАНИЦИ / PAGES КНИЖКА 1 / NUMBER 1: 1 – 152 КНИЖКА 2 / NUMBER 2: 153 – 312 КНИЖКА 3 / NUMBER 3: 313 – 472 КНИЖКА 4 / NUMBER 4: 473 – 632 КНИЖКА 5 / NUMBER 5: 633 – 792 КНИЖКА 6 / NUMBER 6: 793 – 952 КНИЖКА 1 / NUMBER 1: 1 – 152 КНИЖКА 2 / NUMBER 2: 153 – 312 КНИЖКА

(South Africa), A. Ali, M. Bashir (Pakistan) 266 – 278: j-j Coupled Atomic Terms for Nonequivalent Electrons of (n-1)fx and nd1 Configurations and Correlation with L-S Terms / P. L. Meena (India) 760 – 770: Methyl, тhe Smallest Alkyl Group with Stunning Effects / S. Moulay 771 – 776: The Fourth State of Matter / R. Tsekov

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ИМОБИЛИЗИРАНЕНАФРУКТОЗИЛТРАНСФЕРАЗА ВЪРХУКОМПОЗИТНИФИЛМИОТПОЛИМЛЕЧНА КИСЕЛИНА, КСАНТАН И ХИТОЗАН

Илия Илиев, Тонка Василева, Веселин Биволарски, Ася Виранева, Иван Бодуров, Мария Марудова, Теменужка Йовчева

ELECTRICAL IMPEDANCE SPECTROSCOPY OF GRAPHENE-E7 LIQUID-CRYSTAL NANOCOMPOSITE

Todor Vlakhov, Yordan Marinov, Georgi. Hadjichristov, Alexander Petrov

ON THE POSSIBILITY TO ANALYZE AMBIENT NOISERECORDED BYAMOBILEDEVICETHROUGH THE H/V SPECTRAL RATIO TECHNIQUE

Dragomir Gospodinov, Delko Zlatanski, Boyko Ranguelov, Alexander Kandilarov

RHEOLOGICAL PROPERTIES OF BATTER FOR GLUTEN FREE BREAD

G. Zsivanovits, D. Iserliyska, M. Momchilova, M. Marudova

ПОЛУЧАВАНЕ НА ПОЛИЕЛЕКТРОЛИТНИ КОМПЛЕКСИ ОТ ХИТОЗАН И КАЗЕИН

Антоанета Маринова, Теменужка Йовчева, Ася Виранева, Иван Бодуров, Мария Марудова

CHEMILUMINESCENT AND PHOTOMETRIC DETERMINATION OF THE ANTIOXIDANT ACTIVITY OF COCOON EXTRACTS

Y. Evtimova, V. Mihailova, L. A. Atanasova, N. G. Hristova-Avakumova, M. V. Panayotov, V. A. Hadjimitova

ИЗСЛЕДОВАТЕЛСКИ ПРАКТИКУМ

Ивелина Димитрова, Гошо Гоев, Савина Георгиева, Цвета Цанова, Любомира Иванова, Борислав Георгиев

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PARAMETRIC INTERACTION OF OPTICAL PULSES IN NONLINEAR ISOTROPIC MEDIUM

A. Dakova, V. Slavchev, D. Dakova, L. Kovachev

ДЕЙСТВИЕ НА ГАМА-ЛЪЧИТЕ ВЪРХУ ДЕЗОКСИРИБОНУКЛЕИНОВАТА КИСЕЛИНА

Мирела Вачева, Хари Стефанов, Йоана Гвоздейкова, Йорданка Енева

RADIATION PROTECTION

Natasha Ivanova, Bistra Manusheva

СТАБИЛНОСТ НА ЕМУЛСИИ ОТ ТИПА МАСЛО/ ВОДА С КОНЮГИРАНА ЛИНОЛОВА КИСЕЛИНА

И. Милкова-Томова, Д. Бухалова, К. Николова, Й. Алексиева, И. Минчев, Г. Рунтолев

THE EFFECT OF EXTRA VIRGIN OLIVE OIL ON THE HUMAN BODY AND QUALITY CONTROL BY USING OPTICAL METHODS

Carsten Tottmann, Valentin Hedderich, Poli Radusheva, Krastena Nikolova

ИНФРАЧЕРВЕНА ТЕРМОГРАФИЯ ЗА ДИАГНОСТИКА НА ФОКАЛНА ИНФЕКЦИЯ

Рая Грозданова-Узунова, Тодор Узунов, Пепа Узунова

ЕЛЕКТРИЧНИ СВОЙСТВА НА КОМПОЗИТНИ ФИЛМИ ОТ ПОЛИМЛЕЧНА КИСЕЛИНА

Ася Виранева, Иван Бодуров, Теменужка Йовчева

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ТРИ ИДЕИ ЗА ЕФЕКТИВНО ОБУЧЕНИЕ

Гергана Карафезиева

МАГИЯТА НА ТВОРЧЕСТВОТО КАТО ПЪТ НА ЕСТЕСТВЕНО УЧЕНЕ В УЧЕБНИЯ ПРОЦЕС

Гергана Добрева, Жаклин Жекова, Михаела Чонос

ОБУЧЕНИЕ ПО ПРИРОДНИ НАУКИ ЧРЕЗ МИСЛОВНИ КАРТИ

Виолета Стоянова, Павлина Георгиева

ИГРА НА ДОМИНО В ЧАС ПО ФИЗИКА

Росица Кичукова, Ценка Маринова

ПРОБЛЕМИ ПРИ ОБУЧЕНИЕТО ПО ФИЗИКА ВЪВ ВВМУ „Н. Й. ВАПЦАРОВ“

А. Христова, Г. Вангелов, И. Ташев, М. Димидов

ИЗГРАЖДАНЕ НА СИСТЕМА ОТ УЧЕБНИ ИНТЕРНЕТ РЕСУРСИ ПО ФИЗИКА И ОЦЕНКА НА ДИДАКТИЧЕСКАТА ИМ СТОЙНОСТ

Желязка Райкова, Георги Вулджев, Наталия Монева, Нели Комсалова, Айше Наби

ИНОВАЦИИ В БОРБАТА С ТУМОРНИ ОБРАЗУВАНИЯ – ЛЕЧЕНИЕ ЧРЕЗ БРАХИТЕРАПИЯ

Георги Върбанов, Радостин Михайлов, Деница Симеонова, Йорданка Енева

NATURAL RADIONUCLIDES IN DRINKING WATER

Natasha Ivanova, Bistra Manusheva

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АДАПТИРАНЕ НА ОБРАЗОВАНИЕТО ДНЕС ЗА УТРЕШНИЯ ДЕН

И. Панчева, М. Недялкова, П. Петков, Х. Александров, В. Симеонов

STRUCTURAL ELUCIDATION OF UNKNOWNS: A SPECTROSCOPIC INVESTIGATION WITH AN EMPHASIS ON 1D AND 2D 1H NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY

Vittorio Caprio, Andrew S. McLachlan, Oliver B. Sutcliffe, David C. Williamson, Ryan E. Mewis

j-j Coupled Atomic Terms for Nonequivalent Electrons of (n-1)f

j-jCOUPLEDATOMICTERMSFORNONEQUIVALENT, ELECTRONS OF (n-f X nd CONFIGURATIONS AND, CORRELATION WITH L-S TERMS

INTEGRATED ENGINEERING EDUCATION: THE ROLE OF ANALYSIS OF STUDENTS’ NEEDS

Veselina Kolarski, Dancho Danalev, Senia Terzieva

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ZAGREB CONNECTION INDICES OF TiO2 NANOTUBES

Sohaib Khalid, Johan Kok, Akbar Ali, Mohsin Bashir

SYNTHESIS OF NEW 3-[(CHROMEN-3-YL)ETHYLIDENEAMINO]-PHENYL]-THIAZOLIDIN-4ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Naser Troni, Hamit Ismaili, Malesore Pllana, Musaj Pacarizi, Veprim Thaçi, Gjyle Mulliqi-Osmani

2017 година
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GEOECOLOGICAL ANALYSIS OF INDUSTRIAL CITIES: ON THE EXAMPLE OF AKTOBE AGGLOMERATION

Zharas Berdenov, Erbolat Mendibaev, Talgat Salihov, Kazhmurat Akhmedenov, Gulshat Ataeva

TECHNOGENESIS OF GEOECOLOGICAL SYSTEMS OF NORTHEN KAZAKHSTAN: PROGRESS, DEVELOPMENT AND EVOLUTION

Kulchichan Dzhanaleyeva, Gulnur Mazhitova, Altyn Zhanguzhina, Zharas Berdenov, Tursynkul Bazarbayeva, Emin Atasoy

СПИСАНИЕ ПРОСВѢТА

Списание „Просвета“ е орган на Просветния съюз в България. Списанието е излизало всеки месец без юли и август. Годишният том съдържа 1280 стра- ници. Списанието се издава от комитет, а главен редактор от 1935 до 1943 г. е проф. Петър Мутафчиев, историк византолог и специалист по средновеков-

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47-А НАЦИОНАЛНА КОНФЕРЕНЦИЯ НА УЧИТЕЛИТЕ ПО ХИМИЯ

В последните години тези традиционни за българското учителство конфе- ренции се организират от Българското дружество по химическо образование и история и философия на химията. То е асоцииран член на Съюза на химици- те в България, който пък е член на Европейската асоциация на химическите и

JOURNALS OF INTEREST: A REVIEW (2016)

BULGARIAN JOURNAL OF SCIENCE AND EDUCATION POLICY ISSN 1313-1958 (print) ISSN 1313-9118 (online) http://bjsep.org

INVESTIGATING THE ABILITY OF 8

Marina Stojanovska, Vladimir M. Petruševski

SYNTHESIS OF TiO -M (Cd, Co, Mn)

Candra Purnawan, Sayekti Wahyuningsih, Dwita Nur Aisyah

EFFECT OF DIFFERENT CADMIUM CONCENTRATION ON SOME BIOCHEMICAL PARAMETERS IN ‘ISA BROWN’ HYBRID CHICKEN

Imer Haziri, Adem Rama, Fatgzim Latifi, Dorjana Beqiraj-Kalamishi, Ibrahim Mehmeti, Arben Haziri

PHYTOCHEMICAL AND IN VITRO ANTIOXIDANT STUDIES OF PRIMULA VERIS (L.) GROWING WILD IN KOSOVO

Ibrahim Rudhani, Florentina Raci, Hamide Ibrahimi, Arben Mehmeti, Ariana Kameri, Fatmir Faiku, Majlinda Daci, Sevdije Govori, Arben Haziri

ПЕДАГОГИЧЕСКА ПОЕМА

Преди година-две заедно с директора на Националното издателство „Аз- буки“ д-р Надя Кантарева-Барух посетихме няколко училища в Родопите. В едно от тях ни посрещнаха в голямата учителска стая. По стените ѝ имаше големи портрети на видни педагози, а под тях – художествено написани умни мисли, които те по някакъв повод са казали. На централно място бе портретът на Антон Семьонович Макаренко (1888 – 1939). Попитах учителките кой е Макаренко – те посрещнаха въпроса ми с мълчание. А някога, в г

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„СИМВОЛНИЯТ КАПИТАЛ“ НА БЪЛГАРСКОТО УЧИЛИЩЕ

Николай Цанков, Веска Гювийска

KINETICS OF PHOTO-ELECTRO-ASSISTED DEGRADATION OF REMAZOL RED 5B

Fitria Rahmawati, Tri Martini, Nina Iswati

ALLELOPATHIC AND IN VITRO ANTICANCER ACTIVITY OF STEVIA AND CHIA

Asya Dragoeva, Vanya Koleva, Zheni Stoyanova, Eli Zayova, Selime Ali

NOVEL HETEROARYLAMINO-CHROMEN-2-ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Naser Troni, Hamit Ismaili, Gjyle Mulliqi-Osmani, Veprim Thaçi

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Quantum Connement of Mobile Na+ Ions in Sodium Silicate Glassy

QUANTUM CONFINEMENT OF MOBILE Na + IONS, IN SODIUM SILICATE GLASSY NANOPARTICLES

OPTIMIZATION OF ENGINE OIL FORMULATION USING RESPONSE SURFACE METHODOLOGY AND GENETIC ALGORITHM: A COMPARATIVE STUDY

Behnaz Azmoon, Abolfazl Semnani, Ramin Jaberzadeh Ansari, Hamid Shakoori Langeroodi, Mahboube Shirani, Shima Ghanavati Nasab

EVALUATION OF ANTIBACTERIAL ACTIVITY OF DIFFERENT SOLVENT EXTRACTS OF TEUCRIUM CHAMAEDRYS (L.) GROWING WILD IN KOSOVO

Arben Haziri, Fatmir Faiku, Roze Berisha, Ibrahim Mehmeti, Sevdije Govori, Imer Haziri

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COMPUTER SIMULATORS: APPLICATION FOR GRADUATES’ADAPTATION AT OIL AND GAS REFINERIES

Irena O. Dolganova, Igor M. Dolganov, Kseniya A. Vasyuchka

SYNTHESIS OF NEW [(3-NITRO-2-OXO-2H-CHROMEN4-YLAMINO)-PHENYL]-PHENYL-TRIAZOLIDIN-4-ONES AND THEIR ANTIBACTERIAL ACTIVITY

Ramiz Hoti, Hamit Ismaili, Idriz Vehapi, Naser Troni, Gjyle Mulliqi-Osmani, Veprim Thaçi

STABILITY OF RJ-5 FUEL

Lemi Türker, Serhat Variş

A STUDY OF BEGLIKTASH MEGALITHIC COMPLEX

Diana Kjurkchieva, Evgeni Stoykov, Sabin Ivanov, Borislav Borisov, Hristo Hristov, Pencho Kyurkchiev, Dimitar Vladev, Irina Ivanova

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2016 година
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THE EFFECT OF KOH AND KCL ADDITION TO THE DESTILATION OF ETHANOL-WATER MIXTURE

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COMPLEX SYSTEMS FOR DRUG TRANSPORT ACROSS CELL MEMBRANES

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Daniela Dimitrova-Radojchikj, Natasha Chichevska-Jovanova

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РУМЕН ЛЮБОМИРОВ ДОЙЧЕВ (1938 – 1999)

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V. Romanenko, G. Nikitina Academy of Information Technologies in Education, Russia

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44

Донка Ташева, Пенка Василева

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SCIENTIX – OБЩНОСТ ЗА НАУЧНО ОБРАЗОВАНИЕ В ЕВРОПА

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ОБРАЗОВАНИЕ ЗА ПРИРОДОНАУЧНА ГРАМОТНОСТ

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DIFFERENTIAL TEACHING IN SCHOOL SCIENCE EDUCATION: CONCEPTUAL PRINCIPLES

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Книжка 2
Книжка 1
COLORFUL EXPERIMENTS FOR STUDENTS: SYNTHESIS OF INDIGO AND DERIVATIVES

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