Shear-strain step response in linear regime of dilute suspensions of naturally bent carbon nanotubes

Impressive enhancements of the storage modulus have been documented when low volume fractions of single wall carbon nanotubes (SWNTs) are added to a Newtonian solvent for obtaining dilute suspensions. The intrinsic bending dynamics of carbon nanotubes (CNTs) has been proposed to explain such elasticity. CNTs contain topological defects inducing naturally bent structures in absence of external forces and, hence, a semiflexible filament with a bent configuration at minimal internal-bending-energy is used for mimicking the structure of SWNTs in suspension. Previous continuous model is discretized as a non-freely jointed bead-rod chain with a naturally bent configuration for simulating the rheological behaviour after a shear-strain step in linear regime of SWNT dilute suspension by using a Brownian dynamics (BD) approach. In general, bead-rod chains exhibit an instantaneous relaxation after a high shear-strain step. Bending rigidity and number of constitutive rods are found to be determinant parameters in the internal-energy relaxation behaviour of non-freely jointed bead-rod chains in dilute solution. Proper comparisons between the BD simulation results and the experimental data for treated SWNT dilute suspensions confirm the consistency of the physical model mimicking the structure of a SWNT

Tension Dynamics and Linear Viscoelastic Behavior of a Single Semiflexible Polymer Chain

We study the dynamical response of a single semiflexible polymer chain based on the theory developed by Hallatschek et al. for the wormlike-chain model. The linear viscoelastic response under oscillatory forces acting at the two chain ends is derived analytically as a function of the oscillation frequency . We shall show that the real part of the complex compliance in the low frequency limit is consistent with the static result of Marko and Siggia whereas the imaginary part exhibits the power-law dependence +1/2. On the other hand, these compliances decrease as the power law -7/8 for the high frequency limit. These are different from those of the Rouse dynamics. A scaling argument is developed to understand these novel results.Comment: 23 pages, 6 figure

ANALYSIS OF BPJS PATIENT SATISFACTION LEVEL TOWARDS COMMUNITY HEALTH CENTER HEALTH SERVICES

High patient satisfaction will indicate how well the health center is able to provide high-quality medical care. The Service Quality Approach (SERVQUAL) can be used to measure the level of patient satisfaction consisting of fitness, assurance, physical evidence, empathy, and responsiveness. This study examines how satisfied BPJS patients are with medical services. This study was conducted at the Bawomataluo Health Center in Fanayama District. Sampling was carried out using the Accidental Sampling method totaling 99 people. The results of the study showed the influence of reliability, assurance), real evidence, empathy, and no influence of responsiveness to health services. The conclusion of this study is that there is no influence when viewed from the five dimensions in terms of performance level, but there is an influence when viewed from the aspects of completeness, assurance, physical evidence, empathy, and responsibility on the level of BPJS patient satisfaction with health services. It is hoped that the Health Center can improve patient happiness, including attention from health workers who are very important in meeting patient needs to get special care

Perbandingan Peningkatan Pemahaman Konsep Dan Motivasi Belajar Siswa Melalui Penerapan Physics Education Technologies (PhET) Dipadu Eksperimen Dengan Penerapan Physics Education Technologies (PhET)

Tujuan dari penelitian ini adalah untuk mengetahui perbandingan peningkatan pemahaman konsep dan motivasi belajar siswa melalui penerapan media simulasi PhET dipadu eksperimen dibandingkan dengan penerapan simulasi PhET. Penelitian ini dilakukan di SMAN 42 Jakarta pada semester ganjil 2019/2020. Jenis penelitian yang digunakan adalah quasi experiment dengan desain penelitian yang digunakan two group pretest posttest group design. Sampel dalam penelitian ini berjumlah 72 siswa yang terdiri dari 32 siswa kelas A dan 32 siswa kelas B. Pengambilan sampel penelitian menggunakan cluster random sampling. Kelas XI IPA 3 sebagai kelas A menggunakan penerapan media simulasi PhET dipadu eksperimen dan kelas XI IPA 1 sebagai kelas B menggunakan penerapan media simulasi PhET. Instrumen yang digunakan adalah tes hasil pemahaman konsep berupa soal kesetimbangan benda tegar berbentuk pilihan ganda sebanyak 18 soal dan angket hasil motivasi belajar berupa pernyataan sebanyak 20 pernyataan. Hasil penelitian menunjukan terdapat pengaruh penerapan PhET dipadu eksperimen terhadap peningkatan pemahaman konsep dengan nilai rata-rata awal 49,84 untuk kelas A dan 49,13 untuk kelas B, sedangkan nilai rata-rata akhir 80,13 untuk kelas A dan 72,13 untuk kelas B. Untuk motivasi belajar juga meningkat dengan nilai rata-rata awal 51,25 untuk kelas A dan 3,53 untuk kelas B, sedangkan nilai rata-rata akhir 80,97 untuk kelas A dan 75,81 untuk kelas B. Hasil uji manova diperoleh nilai statistik komponen multivariate test yang lebih besar dari 0 dan mendekati 1 serta hasil uji test of between subjects effects juga diperoleh nilai signifikan lebih kecil dari syarat signifikan yaitu sebesar 0,000 (0,000 < 0,05) untuk motivasi belajar dan 0,001 untuk pemahaman konsep (0,001 < 0,05) yang berarti adanya pengaruh peningkatan pemahaman konsep dan motivasi belajar siswa sehingga disimpulkan terdapat pengaruh penerapan PhET dipadu eksperimen dibandingkan dengan penerapan PhET terhadap peningkatan pemahaman konsep dan motivasi belajar siswa. Kata Kunci: PhET, Eksperimen, Pemahaman Konsep, Motivasi Belajar The aim of this research was to find out the comparison of increased concept understanding and student motivation learning by Physics Education Technologies (PhET) Implementation combines experiment with physics education technologies (PhET) implementation. This research was conducted in SMAN 42 Jakarta in odd semester 2019/2020. The type of research used is quasi experiment, the design used is two group protest posttest group design. The sample of this research amounted to 72 students consists of 32 students class A and 32 students class B. sampling using cluster random sampling. Grade XI IPA 3 as the class A using implementation of PhET simulation media combines with experiment, and grade XI IPA 1 as the class B using simulation media of PhET. The instrument used is test result of concept understanding be in the form of multiple choice about rigid body balance consist of 18 questions, and questionnaire about learning motivation result consist of 20 questions. The result showed there’s impact of PhET implementation combines with experiment towards concept understanding improvement with initial grade point average 49.98 for class A and 49.13 for class B, while the final grade point average 80.13 for class A and 72.13 for class B. For learning motivation increases with average point 51.25 for class A and 3.53 for class B, while the final grade point average 80.97 for class A and 75.81 for class B. The result of manova test obtained a statistical point of the multivariate test component which is greater than 0 and approache to 1, and the result test of between subjects effects also obtains a significant point smaller than significant requirement which is equal to 0.000 (0.000 < 0.05) for learning motivation and 0.001 for concept understanding (0.001 < 0.05). It’s concluded there are impact for implementing PhET combines with experiment compared to PhET implementation to increasing concept understanding and learning motivation of students. Key word: PhET, Experiment, Concept Understanding, and Learning Motivation

Improving Student’s Concept Understanding on Equilibrium of a Rigid Body Subject with the Applying of Physics Education and Technology

This research was conducted to get a picture of improving concept understanding of students who get equilibrium of a rigid body subject in senior high schools with applying of PhET (Physics Education and Technology. The study was conducted using quasi-experimental methods with randomized one group pretest - posttest design. The population is all grade XI students of SMA Negeri 42 Jakarta. A sample of one class was selected by cluster random sampling. The sample of this research was class XI A with 32 students. Test instruments in the form of multiple choice tests were 18 items with 5 options answer. The data is processed with the help of SPSS 22 software. The results showed that there was an increase in students’ concept understanding with a gain value of 0.60 in the medium category

Analisa Tingkat Kebisingan Lalulintas di Jalan Raya

Noise is one of the major environmental health problems in big cities. Noise is an unwanted noise that can interfere with and or endanger health. Road traffic is a major source of noise that disrupts most urban communities. The impacts of noise in the housing environment on public health include communication disturbances, psychological disorders, complaints and demonstration actions. The purpose of this research is to know the noise level at Flyover Pasar Rebo and HI Roundabout and to know whether the noise level in Flyover Pasar Rebo and Bundaran HI is still suitable for human hearing. Based on the research that has been done, obtained that the level of kebisisngan in Flyover Pasar Rebo is 62,25 dB. With the highest average noise level of 69 dB which occurred during the day at 11.30-12.00 WIB and at 12:00 to 12:30 pm. While the noise level at Roundabout HI is 61.50 dB. With the highest average noise level of 65 dB which occurred in the morning at 07.30-08.00 WIB. From the data it can be seen that the noise level in Flyover Pasar Rebo is higher than the noise level at Bundaran HI. This is due to the number of vehicles traveling on the highway Flyover Pasar Rebo more than at the HI Round about. Noise levels in the Pasar Rebo and HI Roundabout flyovers are already at "hard" levels and this is not good for health especially on human hearing.Keywords: Noise, Traffic, Flyover Pasar Rebo, HI Roundabou

Populations Digitally Excluded from Education: Issues, Factors, Contributions and Actions for Policy, Practice and Research in a Post-Pandemic Era

This conceptual paper draws on a wide range of research and policy literature, providing a contemporary view of issues, factors and practices that affect education for digitally excluded populations. Concern for how education for digitally excluded populations can be supported is focal to this paper, with different sections offering key related perspectives. From an analysis of issues, factors and practices, actions for policy, practice and research are identified. Given a key finding that power issues can have major effects on plans, implementation processes and outcomes when addressing needs of education for digitally excluded populations, the paper concludes by offering frameworks to support and enable key discussions, to involve representatives from an excluded population as well as those from policy (government and industry), practitioners (teachers and learners) and researchers

Populations digitally excluded from education in a post-pandemic era : issues, factors, contributions and actions for policy, practice and research

This conceptual paper draws on a wide range of research and policy literature, providing a contemporary view of issues, factors and practices that affect education for digitally excluded populations. Concern for how education for digitally excluded populations can be supported is focal to this paper, with different sections offering key related perspectives. From an analysis of issues, factors and practices, actions for policy, practice and research are identified. Given a key finding that power issues can have major effects on plans, implementation processes and outcomes when addressing needs of education for digitally excluded populations, the paper concludes by offering frameworks to support and enable key discussions, to involve representatives from an excluded population as well as those from policy (government and industry), practitioners (teachers and learners) and researchers

Perbandingan Efektivitas Berkumur Larutan Probiotik dan Klorheksidin Terhadap Akumulasi Plak dan Jumlah Streptococcus mutans pada Anak Usia 12-15 Tahun di Yayasan SOS Children’s Village Medan

Perbandingan Efektivitas Berkumur Larutan Probiotik dan Klorheksidin terhadap Akumulasi Plak dan Jumlah Streptococcus mutans pada Anak Usia 12-15 tahun di Yayasan SOS Children’s Village Medan. ix + 53 halaman Akumulasi plak merupakan suatu lapisan lunak yang terdiri atas kumpulan mikroorganisme yang berkembangbiak dan melekat erat pada permukaan gigi. Pengunaan obat kumur klorheksidin dan probiotik dapat digunakan dalam kontrol plak karena memiliki efek bakterisid atau bakteriostatik yang terbukti dapat mereduksi bakteri dan akumulasi plak. Penelitian ini bertujuan untuk mengetahui perbandingan efektivitas berkumur larutan probiotik dan klorheksidin terhadap akumulasi plak dan jumlah Streptococcus mutans pada anak usia 12-15 tahun di Yayasan SOS Children’s Village Medan. Penelitian ini merupakan penelitian eksperimental quasi menggunakan pendekatan pre dan post-test control group design. Subjek penelitian sebanyak 30 orang anak usia 12-15 tahun yang dibagi menjadi 10 orang berkumur probiotik, 10 orang berkumur klorheksidin, dan 10 orang berkumur aquades. Pemeriksaan akumulasi plak menggunakan indeks Loe & Sillness dan pemeriksaan saliva dilakukan di laboratorium menggunakan alat colony counter. Uji analisis menggunakan uji T berpasangan, Wilcoxon, One Way Anova, dan post Hoc dengan nilai kemaknaan p<0,05. Hasil analisis statistik menunjukan ada perbedaan rerata akumulasi plak dan jumlah Streptococcus mutans yang signifikan sebelum dan sesudah berkumur dengan larutan probiotik, klorheksidin dan aquades (p<0,05). Hasil analisis statistik menunjukan ada perbedaan sellisih rerata akumulasi plak dan jumlah Streptococcus mutans yang signifikan sebelum dan sesudah berkumur dengan larutan probiotik, klorheksidin dan aquades (p<0,05). Kesimpulannya bahwa berkumur larutan probiotik lebih efektif dibandingkan berkumur klorheksidin 0,2% terhadap akumulasi plak dan jumlah S.mutans pada anak usia 12-15 tahun di Yayasan SOS Children’s Village Medan (p<0,05).100 HalamanSkripsi Sarjan