PENINGKATAN KEMAMPUAN KONSEP DASAR PENJUMLAHAN DAN PENGURANGAN MELALUI PENGGUNAAN MEDIA SEMPOA KELAS I

AbstrakPenelitian  ini  bertujuan  untuk  meningkatkan  kemampuan  pemahaman  operasi  hitung bilangan cacah penjumlahan dan pengurangan dengan media sempoa pada siswa kelas I di SD Negeri  Buran  III  Kabupaten  Karanganyar.  Jenis  penelitian  ini  adalah  Penelitian  Tindakan Kelas kolaboratif. Subjek penelitian siswa kelas I  yang berjumlah sebanyak 18 siswa. Desain penelitian ini menggunakan model Kemmis dan Mc Taggart. Penelitian ini dilaksanakan dua siklus. Data dikumpulkan dengan teknik observasi, catatan lapangan dan dokumentasi. Teknik analisis  data  yang  digunakan  adalah  analisis  deskriptif  kualitataif  dan  deskriptif  kuantitatif. Indikator  keberhasilan  ditetapkan  berdasarkan  jumlah  siswa  yang  mendapatkan  nilai  diatas KKM yaitu 65 sebanyak 85% atau sebesar 16 dari 18 siswa.                                                                                            Hasil  penelitian  menunjukkan  terjadi  peningkatan  yaitu  pada  pra  tindakan  yang berhasil  mendapatkan  nilai  minimal  KKM  yaitu  sebanyak  11  siswa  (61,16%),  terjadi peningkatan  pada  siklus  I  menjadi  14  siswa  (77,84%)  dan  terjadi  lagi  peningkatan  sebanyak 16 siswa (88,89%). Nilai rata-rata kelas juga mengalami peningkatan sebesar 68,61 pada pra tindakan, 70 pada siklus I dan terjadi penigkatan sebesar 80,27 pada siklus II.Kata kunci : penjumlahan dan pengurangan, media sempoa AbstractThis study aims to improving the ability of basic concept the operation of counting the addition  and  substraction  with  abacus  media  in  grade  1  students  of  Buran  III  elementary school  Karanganyar  regency.  The  type  of  this  research  was  collaborative  classroom  action research. The research subjects were 18 students of 1st grader. The design used on this study was  Kemmis  and  Mc.Taggart’s  model.  This  study  was  conducted  in  two  cycles.  The  Data were collected by observation, field notes, and documentation. The Data analysis techniques used  were  qualitative  and  quantitative  descriptive  analysis.  The  Succeed  indicators  are determined based on the number of students who get scores above KKM 65 as much as 85% or equal to 16 of 18 students.                                                                                                 The  results  showed  an  increase  in  the  pre-action  that  managed  to  get  a  minimum score of KKM as many as 11 students (61,16%), there was an increase in the first cycle to 14 students  (77,84%)  and  again,  there  was  an  increase  of  16  students  (88,89%).  The  class average score is also increased by 68.61 in the pre-action, 70 in the first cycle and 80.27 in the second cycles. Keyword : addition and substraction, abacus media

Electronic and optical properties of lead iodide

ABSTRACT: Lead iodide (PbI2) is a very important material with a technological applicability as a room-temperature radiation detector. It is a wide-band-gap semiconductor (Eg.2 eV) with high environmental stability efficiency. The performance of the detector cannot be fully understood unless its electronic and optical properties are determined. Recently, its band-gap energy and thermal properties were determined by photoacoustic spectroscopy. A single crystal of PbI2 was grown by the Bridgman method with the c-axis oriented perpendicular to the growth axis. The purpose of this work is to obtain the electronic structure of PbI2, its dielectric functions e 1 and e 2 by ellipsometry and theoretically by full-potential linear muffin-tinorbital ~FPLMTO! method, and the temperature dependence of the measured band-gap energy by optica absorption. The obtained Eg(T) can be fitted by two different methods, leading to Eg ~0 K! and Eg ~300 K!

EVALUASI E-LEARNING IDEA PADA S1 TEKNIK INFORMATIKA TELKOM UNIVERSITY MENGGUNAKAN TECHNOLOGY ACCEPTANCE MODEL (TAM)

Pesatnya kemajuan teknologi informasi memberi pengaruh pada perkembangan dibidang pendidikan salah satunya yaitu penerapan e-learning. e-learning menjadi penting pada perguruan tinggi saat ini dikarenakan e-learning dapat mempermudah akses seorang mahasiswa dalam berinteraksi dengan kampusnya. Selain itu e-learning akan meningkatkan daya saing perguruan tinggi tersebut. Untuk mengoptimalkan sistem e-learning, maka harus dilakukan penelitian dengan cara mengevaluasi penggunaan sistem dari e-learning tersebut. Penelitian ini bertujuan untuk mengevaluasi penggunaan sistem e-learning IDEA Telkom University dengan menggunakan metode Technology Acceptance Model yang diperkenalkan oleh Davis, dan untuk mengolah data survei tersebut menggunakan software Partial Least Square (PLS) untuk mengukur persepsi pengguna terhadap e-learning IDEA Telkom University apakah berjalan sesuai fungsinya. Data yang diperoleh merupakan data primer dengan menggunakan kuisioner kepada pengguna IDEA Telkom University yang menggunakan e-learning ini. Variabel-variabel yang digunakan adalah persepsi kemudahan penggunaan, persepsi kegunaan, sikap menggunakan teknologi, minat menggunakan teknologi, dan penggunaan teknologi sesungguhnya. Hasil survei menunjukkan bahwa pengguna IDEA belum sepenuhnya digunakan atau memanfaatkan e-learning ini sebagai media pembelajaran online. Faktor yang menghambat adalah faktor kegunaan, pengguna belum benar-benar merasakan atau memanfaatkan e-learning ini secara maksimal. Karena kegunaan dan sikap juga dipengaruhi secara langsung oleh kemudahan penggunaan maka perlu diadakan rekomendasi terhadap kemudahan-kemudahan dalam penggunaannya Kata kunci: e-learning, IDEA Telkom University, Technology Acceptance Mode

Influence of residual stresses on thermo-mechanical fatigue in turbine housings

This poster presents the results of a neutron investigation of the residual stresses generated during the production of the turbine housing component of a turbocharger with the aim of improving simulation methodologies to predict the locations of thermal fatigue and fracture locations and hence improve the performance of the turbochargers. Initial strain measurements were made on ENGIN-X (Rutherford Appleton Laboratory, UK) on three turbine housings selected from various stages in the manufacturing process. Measurements were made on a region of the housing where failures (cracks) have been recorded after accelerated durability tests, although these have never been predicted by FEA. Measurements were also made using SALSA (ILL, France) on two turbine housings, one as cast and one heat treated. In this experiment the internal divider wall was examined in detail as this is an area where crack initiation can occur during operation. Our results show that heat treatment can reduce compressive residual stresses. However, as compressive stresses are thought to slow the onset of crack initiation and could be beneficial in the material, questions about the efficacy of current production methods have now been raised. These results will be compared with the results of FEA simulations, and suggestions for modifying the simulation methodology and/or production route will be discussed. The authors wish to thank Dr Jon James (Open University) for his help in setting up the ENGIN-X experiment and for the use of the SScanSS software

Evidências Empíricas de Modelos de Estimação do Custo do Capital Próprio

This article investigates whether there are statistically significant differences among the costs of equity capital of Brazilian companies estimated by four models and their variants: Gordon, CAPM, APM and Ohlson-Juettner. We used a cross-section of 34 companies that were part of the São Paulo Stock Exchange Index (IBOVESPA) on December 29, 2005. The results do not permit saying that the choice of model makes no difference in estimating the cost of equity capital, so the methodology hypothesis was rejected. The models based on profit and dividend projections, notably the OJ and Gordon models, resulted in equivalent mean values and also were those that most resemble each other. The OJ model appears to be theoretically superior to the Gordon and Gordon & Gordon models, given that it was developed with fewer premises and in a more analytic manner.Este artigo investiga se existem diferenças estatisticamente significantes entre os valores estimados para o custo de capital próprio de empresas brasileiras através de 4 modelos e suas variantes: Gordon, CAPM, APM e Ohlson-Juettner. Para isso, foi utilizada uma amostra em cross-section de 34 empresas que fizeram parte do Ibovespa em 29/12/2005. Os resultados encontrados não permitem dizer que a escolha do modelo é indiferente com relação ao resultado da estimação do custo de capital próprio, com isso, a hipótese metodológica foi rejeitada. Com relação aos modelos, os baseados em projeções de lucros e dividendos, notadamente os modelos OJ e de Gordon, resultam em valores médios equivalentes entre si e fora os que mais se igualaram em relação aos outros. Finalmente, é importante comentar a superioridade teórica do modelo OJ, dado que este é desenvolvido com um menor número de premissas e de maneira analítica, com relação ao modelo de Gordon e ao modelo de Gordon & Gordon

Subproposal Program Penguatan Kapasitas Ormawa Kemahasiswaan (Ppk Ormawa) Penerapan Kebun Gizi Keluarga Sebagai Upaya Pencegahan Risiko Stunting Untuk Mewujudkan Desa Wates Sehat Melalui Potensi Lokal

Desa Wates merupakan salah satu desa berkembang yang terletak di Kecamatan Simo, Kabupaten Boyolali, Provinsi Jawa Tengah. Terdapat beberapa permasalahan, di antaranya sebagai desa dengan potensi stunting terbesar ke-2 se-Kabupaten Boyolali; 5 dari 6 ibu hamil yang ada terindikasi memiliki LILA (Lingkar Lengan Atas) kurang dari 23,5 cm data Februari 2024; terdapat kebun gizi warga yang terbengkalai; serta rendahnya kesadaran akan perilaku hidup sehat. Berdasarkan permasalahan Desa Wates, tim PPK Ormawa RMC bersama mitra bersepakat untuk mengatasinya dengan: melaksanakan penyuluhan dan memberikan dorongan kepada masyarakat agar dapat mengambil peran aktif dalam mengelola kebun gizi; menciptakan produk pangan untuk meningkatkan nafsu makan dan memenuhi gizi balita serta ibu hamil. Metode yang digunakan dalam mencapai tujuan program ini meliputi: identifikasi kebutuhan masyarakat melalui survei dan diskusi dengan tokoh masyarakat; program revitalisasi kebun gizi dan pengembangan potensi masyarakat; dan pekan GERMAS untuk peningkatan kesehatan. Luaran wajib yang diharapkan: terimplementasikan revitalisasi kebun gizi yang lestari; menghasilkan produk dengan harga jual tinggi; peningkatan taraf kesehatan masyarakat melalui GERMAS (Gerakan Masyarakat Hidup Sehat)

Measurement of residual stresses in the turbine housings of turbochargers

Emission regulations in Europe are extremely stringent and only turbocharged and charged-air-cooled engines are able to comply with current requirements. To meet these performance, durability and legislative conditions, a turbine housing must be capable of operating in harsh environments where vibration is always present and exhaust temperatures can reach 800°C, however many turbine housings are at the limits of operation with regard to strength and durability under these conditions, and failures are recorded on accelerated durability tests. It is now of great importance to understand the fatigue performance of these components and the conditions that determine this performance. In this experiment residual stress measurements will be made of three turbine housings in areas where cracks are commonly observed. We estimate that 4 days of beam time will be required