269 research outputs found
PEMBELAJARAN LUKIS TOTEBAG PADA MATA PELAJARAN SENI BUDAYA DI KELAS X MIA 3 SMA NEGERI 3 BOYOLALI TAHUN AJARAN 2017/2018
ABSTRAK Muhammad Fahmi Al Amiq. PEMBELAJARAN LUKIS PADA TOTEBAG DALAM MATA PELAJARAN SENI BUDAYA DI KELAS X MIA 3 SMA NEGERI 3 BOYOLALI TAHUN AJARAN 2017/2018. Skripsi, Fakultas Keguruan dan Ilmu Pendidikan, Universitas Sebelas Maret Surakarta, Januari 2018. Tujuan penelitian ini adalah untuk mengetahui: (1) Proses pelaksanaan pembelajaran Lukis Totebag di kelas X MIA 3 SMA Negeri 3 Boyolali tahun ajaran 2017/2018. Dan (2) Bagaimana bentuk hasil karya Lukis Totebag yang dihasilkan siswa di kelas X MIA 3 SMA Negeri 3 Boyolali tahun ajaran 2017/2018. Penelitian ini menggunakan pendekatan kualitatif. Sumber data yang digunakan adalah informan yang dipilih yaitu Bapak Subandiyo S.Pd selaku guru mata pelajaran seni budaya di kelas X MIA 3 SMA Negeri 3 Boyolali, serta foto proses pembelajaran, hasil karya siswa dan dokumen arsip. Teknik yang digunakan dalam pengumpulan data adalah observasi langsung, wawancara terstruktur dan mendalam, serta dokumentasi. Uji validitas data dilakukan dengan membandingkan sumber data yang di peroleh berupa daftar hasil wawancara dengan Bapak Subandiyo S.Pd selaku guru mata pelajaran Seni Budaya dengan siswa di kelas X MIA 3 SMA Negeri 3 Boyolali, serta review informant. Analisis data yang digunakan adalah model analisis mengalir, yaitu: reduksi data, sajian data, dan penarikan kesimpulan. Hasil penelitian ini menunjukkan bahwa: (1) Pembelajaran Lukis Totebag diawali dengan pembuatan RPP, selanjutnya pembelajaran dilaksanakan selama tiga kali pertemuan. Strategi yang digunakan guru dalam pembelajaran ini adalah pendekatan scientific. Metode pembelajaran yang digunakan meliputi metode ceramah, tanya jawab, diskusi, dan pemberian tugas. Media pembelajaran yang digunakan berupa slide power point dan media visual berupa sampel karya dari guru. Evaluasi pembelajaran dilakukan dengan menilai aspek kognitif, afektif, dan psikomotorik. Proses pembuatan karya dilakukan dengan beberapa langkah, yaitu membuat sketsa, proses pewarnaan, dan finishing. (2) Secara umum pembuatan karya lukis totebag siswa sudah baik, teknik lukis pada pewarnaan dan finishing dalam membuat karya lukis totebag sudah baik. Karya lukis totebag yang dihasilkan oleh siswa sudah mengandung unsur-unsur seni rupa, yaitu: garis, bentuk, bidang, gelap terang, dan warna. Selain itu, karya lukis totebag yang dihasilkan oleh siswa juga sudah mengandung prinsip-prinsip seni rupa, yaitu: irama (rhytm), dominasi (dominance), keseimbangan (balance), kesatuan (unity), keserasian (harmony), dan kesebandingan (proportion). Kata Kunci: Seni Budaya, Pembelajaran Seni Rupa, Lukis Toteba
Nanoscale Triboelectric-Effect-Enabled Energy Conversion for Sustainably Powering Portable Electronics
Harvesting energy from our living environment is an effective
approach
for sustainable, maintenance-free, and green power source for wireless,
portable, or implanted electronics. Mechanical energy scavenging based
on triboelectric effect has been proven to be simple, cost-effective,
and robust. However, its output is still insufficient for sustainably
driving electronic devices/systems. Here, we demonstrated a rationally
designed arch-shaped triboelectric nanogenerator (TENG) by utilizing
the contact electrification between a polymer thin film and a metal
thin foil. The working mechanism of the TENG was studied by finite
element simulation. The output voltage, current density, and energy
volume density reached 230 V, 15.5 ÎĽA/cm<sup>2</sup>, and 128
mW/cm<sup>3</sup>, respectively, and an energy conversion efficiency
as high as 10–39% has been demonstrated. The TENG was systematically
studied and demonstrated as a sustainable power source that can not
only drive instantaneous operation of light-emitting diodes (LEDs)
but also charge a lithium ion battery as a regulated power module
for powering a wireless sensor system and a commercial cell phone,
which is the first demonstration of the nanogenerator for driving
personal mobile electronics, opening the chapter of impacting general
people’s life by nanogenerators
Nanoscale Triboelectric-Effect-Enabled Energy Conversion for Sustainably Powering Portable Electronics
Harvesting energy from our living environment is an effective
approach
for sustainable, maintenance-free, and green power source for wireless,
portable, or implanted electronics. Mechanical energy scavenging based
on triboelectric effect has been proven to be simple, cost-effective,
and robust. However, its output is still insufficient for sustainably
driving electronic devices/systems. Here, we demonstrated a rationally
designed arch-shaped triboelectric nanogenerator (TENG) by utilizing
the contact electrification between a polymer thin film and a metal
thin foil. The working mechanism of the TENG was studied by finite
element simulation. The output voltage, current density, and energy
volume density reached 230 V, 15.5 ÎĽA/cm<sup>2</sup>, and 128
mW/cm<sup>3</sup>, respectively, and an energy conversion efficiency
as high as 10–39% has been demonstrated. The TENG was systematically
studied and demonstrated as a sustainable power source that can not
only drive instantaneous operation of light-emitting diodes (LEDs)
but also charge a lithium ion battery as a regulated power module
for powering a wireless sensor system and a commercial cell phone,
which is the first demonstration of the nanogenerator for driving
personal mobile electronics, opening the chapter of impacting general
people’s life by nanogenerators
Nanoscale Triboelectric-Effect-Enabled Energy Conversion for Sustainably Powering Portable Electronics
Harvesting energy from our living environment is an effective
approach
for sustainable, maintenance-free, and green power source for wireless,
portable, or implanted electronics. Mechanical energy scavenging based
on triboelectric effect has been proven to be simple, cost-effective,
and robust. However, its output is still insufficient for sustainably
driving electronic devices/systems. Here, we demonstrated a rationally
designed arch-shaped triboelectric nanogenerator (TENG) by utilizing
the contact electrification between a polymer thin film and a metal
thin foil. The working mechanism of the TENG was studied by finite
element simulation. The output voltage, current density, and energy
volume density reached 230 V, 15.5 ÎĽA/cm<sup>2</sup>, and 128
mW/cm<sup>3</sup>, respectively, and an energy conversion efficiency
as high as 10–39% has been demonstrated. The TENG was systematically
studied and demonstrated as a sustainable power source that can not
only drive instantaneous operation of light-emitting diodes (LEDs)
but also charge a lithium ion battery as a regulated power module
for powering a wireless sensor system and a commercial cell phone,
which is the first demonstration of the nanogenerator for driving
personal mobile electronics, opening the chapter of impacting general
people’s life by nanogenerators
Phase Separation Prior to Alloying Observed in Vacuum Heating of Hybrid Au/Cu<sub>2</sub>O Core–Shell Nanoparticles
The
coexistence of decomposition, phase segregation, and alloying
behaviors of Au@Cu<sub>2</sub>O core–shell nanoparticles were
found through in situ heating transmission electron microscopy imaging
and spectral-analysis techniques. Thermally induced compositional
variations (from Cu<sub>2</sub>O to Cu) were observed to be present
in the nanoparticle shells, which was followed by a spontaneous occurrence
of Au–Cu alloying. The higher-Cu loading (1:10 Au/Cu) sample
displays a clear Cu/Cu<sub>2</sub>O phase segregation driven by the
internal stresses resulting from lattice mismatch. Cu extrusions also
occur in this sample after storage in ethanol for 10 days. These in
situ observations/findings may help enhance a fundamental understanding
of remarkable experimental aspects arising in catalytic processes
and other applications as well as provide a valuable reference for
testing/refining potential models of hybrid nanoparticles in theoretical
calculations
Anomalous Growth and Coalescence Dynamics of Hybrid Perovskite Nanoparticles Observed by Liquid-Cell Transmission Electron Microscopy
We
report on <i>in situ</i> observations of nucleation,
growth, and aggregation of hybrid organic–inorganic perovskites
by liquid-cell transmission electron microscopy. Direct crystallization
of hybrid CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> nanoparticles
is achieved through an electron beam-assisted solvent evaporation
approach. Time-lapse liquid-cell TEM imaging of the nanoparticles
reveals a growth trend which is not entirely consistent with the classical
Lifshitz–Slyozov–Wagner growth model. Significantly
complex dynamical behaviors are observed during the coalescence process
of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> nanoparticles. We propose
that the chemical instability inherent in the hybrid perovskite iodides
should be considered to understand this phenomenon in addition to
the oriented attachment mechanism. This study provides a useful reference
for understanding the intriguing chemical and physical properties
of hybrid organic–inorganic perovskites
Multishelled Si@Cu Microparticles Supported on 3D Cu Current Collectors for Stable and Binder-free Anodes of Lithium-Ion Batteries
Silicon has proved to be a promising
anode material of high-specific
capacity for the next-generation lithium ion batteries (LIBs). However,
during repeated discharge/charge cycles, Si-based electrodes, especially
those in microscale size, pulverize and lose electrical contact with
the current collectors due to large volume expansion. Here, we introduce
a general method to synthesize Cu@M (M = Si, Al, C, SiO<sub>2</sub>, Si<sub>3</sub>N<sub>4</sub>, Ag, Ti, Ta, SnIn<sub>2</sub>O<sub>5</sub>, Au, V, Nb, W, Mg, Fe, Ni, Sn, ZnO, TiN, Al<sub>2</sub>O<sub>3</sub>, HfO<sub>2</sub>, and TiO<sub>2</sub>) core–shell
nanowire arrays on Cu substrates. The resulting Cu@Si nanowire arrays
were employed as LIB anodes that can be reused via HCl etching and
H<sub>2</sub>-reduction. Multishelled Cu@Si@Cu microparticles supported
on 3D Cu current collectors were further prepared as stable and binder-free
LIB anodes. This 3D Cu@Si@Cu structure allows the interior conductive
Cu network to effectively accommodate the volume expansion of the
electrode and facilitates the contact between the Cu@Si@Cu particles
and the current collectors during the repeated insertion/extraction
of lithium ions. As a result, the 3D Cu@Si@Cu microparticles at a
high Si-loading of 1.08 mg/cm<sup>2</sup> showed a capacity retention
of 81% after 200 cycles. In addition, charging tests of 3D Cu@Si@Cu-LiFePO<sub>4</sub> full cells by a triboelectric nanogenerator with a pulsed
current demonstrated that LIBs with silicon anodes can effectively
store energy delivered by mechanical energy harvesters
Enhanced P3HT/ZnO Nanowire Array Solar Cells by Pyro-phototronic Effect
The pyro-phototronic
effect is based on the coupling among photoexcitation,
pyroelectricity, and semiconductor charge transport in pyroelectric
materials, which can be utilized to modulate photoexcited carriers
to enhance the output performance of solar cells. Herein, we have
demonstrated the largely enhanced output performance of a P3HT/ZnO
nanowire array photovoltaic cell (PVC) by using the pyro-phototronic
effect under weak light illuminations. By applying an external cooling
temperature variation, the output current and voltage of the PVC can
be dramatically enhanced by 18% and 152% under indoor light illumination,
respectively. This study realizes the performance enhancement of pyroelectric
semiconductor materials-based solar cells <i>via</i> a temperature-variation-induced
pyro-phototronic effect, which may have potential applications in
solar energy scavenging and self-powered sensor systems
Hybridized Electromagnetic–Triboelectric Nanogenerator for a Self-Powered Electronic Watch
We report a hybridized nanogenerator including a triboelectric nanogenerator (TENG) and six electromagnetic generators (EMGs) that can effectively scavenge biomechanical energy for sustainably powering an electronic watch. Triggered by the natural motions of the wearer’s wrist, a magnetic ball at the center in an acrylic box with coils on each side will collide with the walls, resulting in outputs from both the EMGs and the TENG. By using the hybridized nanogenerator to harvest the biomechanical energy, the electronic watch can be continuously powered under different motion types of the wearer’s wrist, where the best approach is to charge a 100 μF capacitor in 39 s to maintain the continuous operation of the watch for 456 s. To increase the working time of the watch further, a homemade Li-ion battery has been utilized as the energy storage unit for realizing the continuous working of the watch for about 218 min by using the hybridized nanogenerator to charge the battery within 32 min. This work will provide the opportunities for developing a nanogenerator-based built-in power source for self-powered wearable electronics such as an electronic watch
Conductive Fabric-Based Stretchable Hybridized Nanogenerator for Scavenging Biomechanical Energy
We demonstrate a stretchable hybridized
nanogenerator based on
a highly conductive fabric of glass fibers/silver nanowires/polydimethylsiloxane.
Including a triboelectric nanogenerator and an electromagnetic generator,
the hybridized nanogenerator can deliver output voltage/current signals
from stretchable movements by both triboelectrification and electromagnetic
induction, maximizing the efficiency of energy scavenging from one
motion. Compared to the individual energy-harvesting units, the hybridized
nanogenerator has a better charging performance, where a 47 ÎĽF
capacitor can be charged to 2.8 V in only 16 s. The hybridized nanogenerator
can be integrated with a bus grip for scavenging wasted biomechanical
energy from human body movements to solve the power source issue of
some electric devices in the pure electric bus
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