The differences of students learning outcome with numbered head together (NHT) and think pair share (TPS) in atomic structure

2018 ◽  
Vol 10 (2) ◽  
pp. 377-381
Author(s):  
Feri Andi Syuhada ◽  
Keyword(s):  
Atomic Structure ◽  
Learning Outcome

scholarly journals PENERAPAN PhET SEBAGAI MEDIA PEMBELAJARAN STRUKTUR ATOM DAN SISTEM PERIODIK DI SMK NAHDLATUL ULAMA SUGIO LAMONGAN

2020 ◽  
Vol 9 (3) ◽  
pp. 309-316
Author(s):  
Karuniatul Ilma ◽  
Achmad Lutfi
Keyword(s):  
Learning Outcomes ◽  
Periodic System ◽  
Atomic Structure ◽  
Learning Outcome ◽  
Learning Activity ◽  
Periodic Systems ◽  
Test Design ◽  
Student Activity ◽  
Post Test ◽  
Nahdlatul Ulama

Tujuan penelitian ini dilakukan untuk mengetahui hasil belajar, aktivitas dan respon dari peserta didikpada penerapan PhET sebagai media pembelajaran struktur atom dan sistem periodik.Subjek..penelitian..adalah peserta..didik kelas X Otomotif SMK Nahdlatul Ulama Sugio KabupatenLamongan. Instrument yang digunakan adalah soal Pre-test..dan..Post-test, lembar observasi aktivitaspeserta didik dan angket respon peserta didik. Desain penelitian yang dilakukan pada penelitian ini adalahOne-Group Pre-test dan Post-test design, penelitian dilakukan dalam 1 kali pertemuan dengan rentangwaktu 3 x 45 menit dan diamati oleh 1 orang observer. Selama penelitian peserta didik dilatihkanmengoperasikan PhET dan melakukan percobaan menggunakan media PhET pada materi struktur atomdan sistem periodik. Kemudian pada akhir kegiatan pembelajaran diberikan tes hasil belajar untukmengetahui ketuntasan peserta didik selama penerapan media PhET dan pembagian lembar angket responpeserta didik setelah menggunakan media PhET. Data yang diperoleh menunjukkan bahwa: (1)ketuntasan yang didapat dari hasil..belajar..peserta..didik termasuk dalam kategori baik dengan mendapatpersentase ketuntasan..sebesar..75%, (2) aktivitas peserta didik selama pembelajaran struktur atom dansistem periodik menggunakan media PhET tergolong dalam predikat sangat aktif dengan ditunjukkanpersentase aktivitas peserta didik yang relevan sebesar 92,59% sedangkan yang tidak relevan sebesar7,41%, dan (3) setelah menggunakan media PhET dalam pembelajaran struktur atom dan sistem periodikrespon peserta didik dikatakan baik, hal ini dibuktikan dengan rata-rata respon positif peserta didiksebesar 92,5% sedangkan respon negatif peserta didik sebesar 7,5%. Bersarkan hasil dari penelitian makapenggunaan PhET sebagai media pembelajaran struktur atom dan sistem periodik dapat meningkatkanhasil belajar dengan kategori baik, aktivitas peserta didik selama pembelajaran sangat aktif dan responpeserta didik baik.Kata Kunci: media pembelajaran PhET, struktur atom, hasil belajar, respon, aktivitas peserta didik AbstractThe purpose of this research is to know the learning outcome, activity and respons of student on theapplication of PhET as learning medium for atomic structure and periodic system. The research subjectswere students of class X Automotive SMK Nahdlatul Ulama Sugio Lamongan Regency. The instrumentsused was a matter of Pre-test and Post-test, observation sheet of student activity and studentquestionnaire responses. The research design carried out in this study is the One-Group Pre-test andPost-test design, the study was conducted in 1 meeting with a span of 3 x 45 minutes and observed by 1observer. During the study students were trained to operate the PhET and conduct experiments using thePhET media on atomic structure and periodic system. Then at the end of the learning activity given a testof learning outcomes to determine the completeness of student during the applicaton of the PhET mediaand the distribution of students questionnaire responses after using the PhET media The data obtainedshows that: (1) completeness of student learning outcomes is included in the good category by getting apercentage of completeness of 75%, (2) The activities of students during the learning of atomic structuresand periodic systems using the PhET media are classified as very active with proven percentage ofrelevant student activity of 92.59% while irrelevant of 7.41%, and (3) After using the PhET media inlearning the atomic structure and the periodic system the response of students is said to be good, this isevidenced by the average positive response of students by 92.5% while the negative response of studentsby 7.5%. Based on the results of the study, the use of PhET as a learning medium for atomic structuresand periodic systems can improve learning outcome in either category, student activity during learning isvery active and student responses are good.Keyword: PhET Learning media, atomic structure atom, learning outcomes, responses, student activities.

scholarly journals Pengaruh Penggunaan Asesmen Portofolio pada Model Pembelajaran Kooperatif Tipe STAD terhadap Hasil Belajar Siswa Kelas X MIA SMA Negeri 1 Tellu Siattinge Kabupaten Bone (Studi pada Materi Pokok Struktur Atom dan Tabel Periodik)

2018 ◽  
Vol 19 (1) ◽  
pp. 8
Author(s):  
Asriani Haruna ◽  
Ramlawati Ramlawati ◽  
Army Auliah
Keyword(s):  
Cooperative Learning ◽  
Learning Outcomes ◽  
Atomic Structure ◽  
Subject Matter ◽  
Periodic Table ◽  
Learning Outcome ◽  
Independent Variables ◽  
Quasi Experimental ◽  
Item Data ◽  
Student Team

ABSTRAKPenelitian ini adalah penelitian eksperimen semu yang bertujuan untuk mengetahui adanya pengaruh penggunaan asesmen portofolio pada model pembelajaran kooperatif tipe STAD terhadap hasil belajar siswa kelas X MIA SMA Negeri 1 Tellu Siattinge. Variabel bebas dalam penelitian ini adalah penggunaan asesmen portofolio pada model pembelajaran kooperatif tipe STAD dan model pembelajaran kooperatif tipe STAD tanpa asesmen portofolio, serta variabel terikatnya adalah hasil belajar siswa pada materi pokok Struktur Atom dan Sistem Periodik Unsur.  Populasi penelitian ini adalah siswa kelas X MIA SMA Negeri 1 Tellu Siattinge yang terdiri dari 4 kelas berjumlah 128 orang. Sampel penelitian terdiri dari 2 kelas yaitu kelas X1 sebagai kelas eksperimen dengan jumlah siswa 32 orang dan kelas X4 sebagai kelas kontrol dengan jumlah siswa 32 orang juga. Data hasil penelitian diperoleh dengan memberikan pretest dan posttest dengan instrumen penelitian berupa soal pilihan ganda sebanyak 25 item. Data hasil belajar yang diperoleh dianalisis dengan menggunakan statistik deskriptif dan statistik inferensial. Hasil analisis menunjukkan nilai rata-rata hasil belajar siswa kelas eksperimen pada pretest dan posttest berturut-turut yaitu 21,25 dan 69,81 dengan rata-rata N-Gain 0,61 dan kelas kontrol yaitu 22,81 dan 58,56 dengan rata-rata N-Gain 0,47. Hasil pengujian hipotesis menggunakan uji-t diperoleh nilai thitung = 3,74 dan pada taraf signifikan α = 0,05 dengan dk = 62 diperoleh ttabel = 2,00. Oleh karena itu, thitung > ttabel, maka H1 diterima dan H0 ditolak.. Disimpulkan bahwa ada pengaruh penggunaan asesmen portofolio pada model pembelajaran kooperatif tipe STAD terhadap hasil belajar siswa kelas  X MIA SMA Negeri 1 Tellu Siattinge pada materi pokok Struktur Atom dan Sistem Periodik Unsur.Kata Kunci : asesmen portofolio, Student Team Achievement Division (STAD), Hasil Belajar, Struktur Atom dan Sistem Periodik UnsurABSTRACTThis research is a quasi-experimental that aimed to know the effect of using assessment portfolio through STAD type of cooperative learning toward study result of the student’s class X MIA SMA Negeri 1 Tellu Siattinge. The independent variables in this research is using assessment portfolio  through STAD type of  cooperative learning and STAD type of  cooperative learning without using asesmen portfolio. The dependent variable is study result on subject matter atomic structure and periodic table . The population in this research is X MIA SMA Negeri 1 Tellu Siattinge consist of four classes which students 128. As a sample of this research consisted of two classes, namely class X1 as a experimental class with 32 students and class X4 as a control class with 32 students. The data of research are  gather  by giving pretest and posttest which the research istrumen is multiple choice with a number of questions are 25 items. Learning outcomes data were analyzed by using descriptive and inferential statistics. The analysis showed the average of students’ learning outcome value from experimental class in the pretest and posttest, respectively are 21,25 and 69,81 with N-Gain average 0,61. From control class are 22,81 and 58,56 with N-Gain average 0,47. The result of hypothesis testing by using t-test values, obtained that tobser=3,74 and α = 0,05 with df=68, obtained that ttable=2,00 so H1 was accepted and H0 was rejected because tobser > ttabel.  The conclution, there was the influence of using assessment portfolio through STAD type of  cooperative  learning gives affected toward study result of the student’s class X MIA SMA Negeri 1 Tellu Siattinge on atomic structure and periodic table.Keywords: Assessment portofolio, Student Team Achievement Division (STAD), Student’s Achievement, Atomic Structure and Periodic Table

Radiation-induced surface decomposition

1983 ◽  
Vol 41 ◽  
pp. 368-369
Author(s):  
M. L. Knotek
Keyword(s):  
Ionizing Radiation ◽  
Atomic Structure ◽  
Chemical Bonding ◽  
Neutral Species ◽  
Radiation Induced ◽  
Physical And Chemical ◽  
Surface Decomposition ◽  
The Relationship ◽  
Electron And Photon ◽  
Surface Bond

Modern surface analysis is based largely upon the use of ionizing radiation to probe the electronic and atomic structure of the surfaces physical and chemical makeup. In many of these studies the ionizing radiation used as the primary probe is found to induce changes in the structure and makeup of the surface, especially when electrons are employed. A number of techniques employ the phenomenon of radiation induced desorption as a means of probing the nature of the surface bond. These include Electron- and Photon-Stimulated Desorption (ESD and PSD) which measure desorbed ionic and neutral species as they leave the surface after the surface has been excited by some incident ionizing particle. There has recently been a great deal of activity in determining the relationship between the nature of chemical bonding and its susceptibility to radiation damage.

Simulated Dark-Field Electron Micrographs of Point Defects and Organometallics

1975 ◽  
Vol 33 ◽  
pp. 200-201
Author(s):  
William Krakow
Keyword(s):  
Electron Micrographs ◽  
Point Defects ◽  
Structure Determination ◽  
Atomic Structure ◽  
Image Interpretation ◽  
Dark Field ◽  
Field Electron ◽  
Dark Field Microscopy ◽  
Dark Field Electron

Tilted beam dark-field microscopy has been applied to atomic structure determination in perfect crystals, several synthesized molecules with heavy atcm markers and in the study of displaced atoms in crystals. Interpretation of this information in terms of atom positions and atom correlations is not straightforward. Therefore, calculated dark-field images can be an invaluable aid in image interpretation.

Surface reconstructions of (001) cleaved GdBa2Cu3O7-δ

1992 ◽  
Vol 50 (1) ◽  
pp. 106-107
Author(s):  
H.W. Zandbergen ◽  
M.R. McCartney
Keyword(s):  
Electron Microscopy ◽  
Copper Oxide ◽  
Grain Boundaries ◽  
Atomic Structure ◽  
Oxygen Deficiency ◽  
Surface Layers ◽  
Layer Sequence ◽  
Surface Reconstructions ◽  
Good Agreement

Very few electron microscopy papers have been published on the atomic structure of the copper oxide based superconductor surfaces. Zandbergen et al. have reported that the surface of YBa2Cu3O7-δ was such that the terminating layer sequence is bulk-Y-CuO2-BaO-CuO-BaO, whereas the interruption at the grain boundaries is bulk-Y-CuO2-BaO-CuO. Bursill et al. reported that HREM images of the termination at the surface are in good agreement with calculated images with the same layer sequence as observed by Zandbergen et al. but with some oxygen deficiency in the two surface layers. In both studies only one or a few surfaces were studied.

High-resolution electron microscopy of the atomic structure of some grain boundaries in Au

1986 ◽  
Vol 44 ◽  
pp. 414-415
Author(s):  
W. Krakow ◽  
D. A. Smith
Keyword(s):  
Atomic Structure ◽  
High Resolution Electron Microscopy ◽  
Image Features ◽  
Image Feature ◽  
Resolution Electron ◽  
Tilt Boundaries ◽  
Processing Techniques ◽  
Atom Position ◽  
Structure Configuration

The successful determination of the atomic structure of [110] tilt boundaries in Au stems from the investigation of microscope performance at intermediate accelerating voltages (200 and 400kV) as well as a detailed understanding of how grain boundary image features depend on dynamical diffraction processes variation with specimen and beam orientations. This success is also facilitated by improving image quality by digital image processing techniques to the point where a structure image is obtained and each atom position is represented by a resolved image feature. Figure 1 shows an example of a low angle (∼10°) Σ = 129/[110] tilt boundary in a ∼250Å Au film, taken under tilted beam brightfield imaging conditions, to illustrate the steps necessary to obtain the atomic structure configuration from the image. The original image of Fig. 1a shows the regular arrangement of strain-field images associated with the cores of ½ [10] primary dislocations which are separated by ∼15Å.

Atomic structure imaging of the Si/SiO2 interface with high-resolution electron microscopy

1986 ◽  
Vol 44 ◽  
pp. 390-391
Author(s):  
J.L. Batstone ◽  
J.M. Gibson ◽  
Alice.E. White ◽  
K.T. Short
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Atomic Structure ◽  
High Resolution Electron Microscopy ◽  
Medium Voltage ◽  
Voltage Electron ◽  
Resolution Electron ◽  
Structural Image ◽  
Electron Microscopes ◽  
Point To Point

High resolution electron microscopy (HREM) is a powerful tool for the determination of interface atomic structure. With the previous generation of HREM's of point-to-point resolution (rpp) >2.5Å, imaging of semiconductors in only <110> directions was possible. Useful imaging of other important zone axes became available with the advent of high voltage, high resolution microscopes with rpp <1.8Å, leading to a study of the NiSi2 interface. More recently, it was shown that images in <100>, <111> and <112> directions are easily obtainable from Si in the new medium voltage electron microscopes. We report here the examination of the important Si/Si02 interface with the use of a JEOL 4000EX HREM with rpp <1.8Å, in a <100> orientation. This represents a true structural image of this interface.

Morphology and atomic structure of segregated grain boundaries in Cu-Sb

1992 ◽  
Vol 50 (1) ◽  
pp. 254-255
Author(s):  
R. W. Fonda ◽  
D. E. Luzzi
Keyword(s):  
Grain Boundary ◽  
Grain Boundaries ◽  
Intergranular Fracture ◽  
Atomic Structure ◽  
Copper Alloys ◽  
Polycrystalline Materials ◽  
Grain Boundary Embrittlement ◽  
Boundary Embrittlement

The properties of polycrystalline materials are strongly dependant upon the strength of internal boundaries. Segregation of solute to the grain boundaries can adversely affect this strength. In copper alloys, segregation of either bismuth or antimony to the grain boundary will embrittle the alloy by facilitating intergranular fracture. Very small quantities of bismuth in copper have long been known to cause severe grain boundary embrittlement of the alloy. The effect of antimony is much less pronounced and is observed primarily at lower temperatures. Even though moderate amounts of antimony are fully soluble in copper, concentrations down to 0.14% can cause grain boundary embrittlement.

Atomic structure of stair rod misfit dislocations at the GaAs on Si(100) interface

1990 ◽  
Vol 48 (4) ◽  
pp. 342-343
Author(s):  
D. Gerthsen
Keyword(s):  
Lattice Constant ◽  
Atomic Structure ◽  
Spherical Aberration ◽  
Stacking Faults ◽  
Misfit Dislocations ◽  
Gaas On Si ◽  
Thermal Expansion Coefficients ◽  
Transmission Electron ◽  
Intersection Line ◽  
Oriented Parallel

The prospect of technical applications has induced a lot of interest in the atomic structure of the GaAs on Si(100) interface and the defects in its vicinity which are often studied by high resolution transmission electron microscopy. The interface structure is determined by the 4.1% lattice constant mismatch between GaAs and Si, the large difference between the thermal expansion coefficients and the polar/nonpolar nature of the GaAs on Si interface. The lattice constant mismatch is compensated by misfit dislocations which are characterized by a/2<110> Burgers vectors b which are oriented parallel or inclined on {111} planes with respect to the interface. Stacking faults are also frequently observed. They are terminated by partial dislocations with b = a/6<112> on {111} planes. In this report, the atomic structure of stair rod misfit dislocations is analysed which are located at the intersection line of two stacking faults at the interface.A very thin, discontinous film of GaAs has been grown by MBE on a Si(100) substrate. Fig.1.a. shows an interface section of a 27 nm wide GaAs island along [110] containing a stair rod dislocation. The image has been taken with a JEOL 2000EX with a spherical aberration constant Cs = 1 mm, a spread of focus Δz = 10 nm and an angle of beam convergence ϑ of 2 mrad.

Quasiperiodic interfaces: HREM observations of grain and phase boundaries

1990 ◽  
Vol 48 (4) ◽  
pp. 332-333
Author(s):  
K. L. Merkle
Keyword(s):  
Atomic Structure ◽  
Direct Determination ◽  
Lattice Parameter ◽  
Atomic Scale ◽  
Misfit Dislocations ◽  
Oxide Systems ◽  
Atomic Structures ◽  
Periodic Arrays ◽  
Parameter Ratio ◽  
Metal Metal

The atomic structures of internal interfaces have recently received considerable attention, not only because of their importance in determining many materials properties, but also because the atomic structure of many interfaces has become accessible to direct atomic-scale observation by modem HREM instruments. In this communication, several interface structures are examined by HREM in terms of their structural periodicities along the interface.It is well known that heterophase boundaries are generally formed by two low-index planes. Often, as is the case in many fcc metal/metal and metal/metal-oxide systems, low energy boundaries form in the cube-on-cube orientation on (111). Since the lattice parameter ratio between the two materials generally is not a rational number, such boundaries are incommensurate. Therefore, even though periodic arrays of misfit dislocations have been observed by TEM techniques for numerous heterophase systems, such interfaces are quasiperiodic on an atomic scale. Interfaces with misfit dislocations are semicoherent, where atomically well-matched regions alternate with regions of misfit. When the misfit is large, misfit localization is often difficult to detect, and direct determination of the atomic structure of the interface from HREM alone, may not be possible.

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