PENGARUH PENGGUNAAN MODEL PEMBELAJARAN KOOPERATIF TIPE NUMBERED HEAD TOGETHER BERBANTUAN ALAT PERAGA BANGUN RUANG TERHADAP PEMAHAMAN MATEMATIKA SISWA PADA POKOK BAHASAN KUBUS DAN BALOK (Studi Eksperimen di kelas VIII MTs Rabithatul ‘Ulum Krangkeng)

HASAN RAHMAT : “Pengaruh Penggunaan Model Pembelajaran Kooperatif Tipe Numbered Head Together Berbantuan Alat Peraga Bangun Ruang terhadap Pemahaman Matematika Siswa pada Pokok Bahasan Kubus dan Balok.” Keberhasilan proses pembelajaran pada pelajaran metematika dapat diukur dari keberhasilan siswa yang mengikuti pembelajaran tersebut. Hal itu dapat dilihat dari tingkat pemahaman, penguasaan materi serta prestasi belajar siswa. Namun dalam kenyataannya dapat dilihat bahwa prestasi belajar matematika yang dicapai siswa masih rendah dan apa yang dipelajari siswa kurang bermakna, karena kurangnya minat belajar siswa terhadap matematika. Selain itu, kurang tepatnya seorang guru dalam memilih model, strategi, dan metode pembelajaran yang digunakan. Tujuan dari penelitian ini adalah untuk mengetahui seberapa baik penggunaan model pembelajaran koperatif tipe Numbered Head Together berbantuan alat peraga, untuk mengetahui seberapa besar pemahaman matematika siswa dan untuk mengetahui seberapa besar pengaruh penggunaan model pembelajaran koperatif tipe Numbered Head Together (NHT) berbantuan alat peraga Bangun Ruang terhadap Pemahaman Matematika siswa pada pokok bahasan Kubus dan Balok di MTs Rabithatul ‘Ulum Krangkeng. Penerapan model pembelajaran Numbered Head Together berbantuan alat peraga diharapkan akan memberi pengaruh terhadap pemahaman matematika sekaligus meningkatkan prestasi belajar siswa, sehingga apa yang menjadi harapan guru-guru di sekolah, orang tua dan siswa itu sendiri dapat tercapai, yaitu prestasi tergolong baik. Semakin baik prestasi belajar siswa, maka tujuan daripendidikan telah tercapai. Teknik pengumpulan data yang digunakan dalam penelitian ini adalah angket dan tes. Siswa kelas VIII di MTs Rabithatul ‘Ulum Krangkeng berjumlah 179 siswa, sedangkan pengambilan sampel dalam penelitian ini adalah 35 siswa. Metode yang digunakan adalah metode Eksperimen. Setelah data diperoleh, kemudian data tersebut di analisis dengan menggunakan uji normalitas, uji homogenitas, uji kelinieran regresi, dan uji kebaikan model. Dari hasil penelitian dapat disimpulkan bahwa terdapat pengaruh yang signifikan antara model pembelajran Numbered Head Together berbantuan alat peraga terhadap pemahaman matematika siswa sebesar 0.224. Selain itu dengan persamaan regresi untuk kedua variabel tersebut adalah = 0,833X, dari persamaaan tersebut koefesien regresi sebesar 0,833 menyatakan bahwa setiap penambahan (peningkatan) penggunaan model pembelajaran NHT berbantuan alat peraga akan mempengaruhi pemahaman matematika siswa. Kata kunci: Model Pembelajaran Numbered Head Together, Alat peraga, dan Pemahaman Matematik

Draw Point Construction Improvement Using Six Sigma

Draw point is a loading pointh beneath a stope, utilizing gravity to move down bulk material in underground mine block caving of PT Freeport Indonesia. A draw point is a steel set that is erected and poured in place with concrete. There are 9 sub processes of draw point construction: site preparation, lean concrete, embedded rail, concrete floor, anvil top, lintel set, forming & meshing, wall & roof concrete, stripping & general clean-up. Based on data analysis period 2008, there is a gap 4.03 until draw point of yearly target with average of completion time of a draw point construction 46.44 shifts and standard deviation 6.95 shifts. It is slower by 9.7% of target 42 shifts. The high standard deviation and slower process indicate there is a process quality problem in draw point construction so it makes draw point construction incompliance to achieve its monthly or yearly target. For improving the process quality, Six Sigma approach with DMAIC methodology will be used to indentify incapable process and its causes. Then alternative solutions are proposed to fix it and control the key process variable causing the defects.Keywords:completion time, process quality, six sigma, DMAI

Pengaruh Kepercayaan Diri Dan Semangat Kerja Terhadap Kinerja Pegawai Dengan Motivasi Sebagai Variabel Intervening

The purpose of this study was to analyze (1) the significance of the effect of self-confidence on employee performance either directly or through work motivation as an intervening variable; (2) the significance of the effect of morale on employee performance either directly or through work motivation as an intervening variable; The research sample was 89 employees. The sample was determined using the Sampling Table with an error rate of 5%. Data were collected with the main instrument, namely a questionnaire. Data analysis technique using Path Analysis. The results showed that (1) Self-confidence had a significant effect on employee performance but not significant through work motivation as an intervening variable; (2) Work morale has a significant effect on employee performance but is not significant through work motivation as an intervening variable

The Correlation Analysis of Islamic Education (PAI) Learning Outcomes with Religious Tolerance at Universitas Pendidikan Indonesia (UPI)

This study is motivated by the rampant cases and the spread of intolerant and radical understanding. The cases of intolerance and radicalization even occur to students who should possess a tolerant religious understanding and not get caught up in the indoctrination of religious violence. This study aims to analyze the correlation between PAI learning outcomes and religious tolerance. It applies a causal design and quantitative approach with survey method. The population of UPI Bumi Siliwangi is 24.340 students. The data is collected by utilizing probality sampling technique (cluster sampling). There are 344 respondents and questionnaires are served as the research instrument. Then, the data is analyzed by using descriptive and inferential analysis with the assistance of SPSS. The results of this study indicate that the learning outcomes of UPI students mostly get A is at the level of 45,9%. Religious tolerance of UPI students is generally at the most tolerant level of 61,63%. Tolerance to other religions is highest at the tolerant level of 60,17. Tolerance to the same religion but with different understanding, in this case is minority mazhab, is mostly tend to be intolerant level of 47,67%. Tolerance to the state and government, is mostly at the tolerant level of 38,66%. This study finds that there is no significant correlation between PAI learning outcomes and religious tolerance among the UPI students

Effect of Mineral and Humic Substances on Tailing Soil Properties and Nutrient Uptake by Pennisetum purpureum Schumach

Tin mining produces a by-product sand tailing from soil leaching with characteristic low pH and total organic carbon, and can be reclaimed by providing a suitable ameliorant.  When available in situ, ameliorant materials can be economically used as they are required in large amounts. Fortunately, Bangka Belitung has sample stock of such kaolinite-rich minerals that can be utilized for improving soil chemical properties. Extracted organic materials, such as humic substances, can also be utilized as they influence the complex soil reactions, and promote plant growth. Thus, this study aimed to assess the effects of mineral, humic materials and interaction of both material on soil chemical properties and nutrient uptake of Pennisetum purpureum Schumach. A completely randomized design with 2 factors and 3 replications each was employed. Factor 1 was mineral matter is 0; 420; 840; 1.260 Mg ha-1 while Factor 2 was humic material is 0; 0.46; 0.92; 1.38 kg C ha-1. Air-dried samples of tailing were applied with oil palm compost then mixed evenly with mineral and humic materials.  Penissetum purpureum Schumach was planted after 4 weeks incubation, and maintained for another 4 weeks. The results demonstrated that the addition of mineral matter significantly increased soil organic carbon content, total N, exchangeable K, Fe, Mn and boosted nutrient - total Ca, Mg and Mn – uptake of the plant. But the application of humic material increased only soil organic carbon content. The interaction of both materials only lowered soil pH

Analisis Perbandingan Kekerasan Beberapa Merk Katup Sepeda Motor Matic

This article discusses a comparison of the hardness of several valve brands for automatic motorbikes. This research used comparative study method. The motorbike used was the Honda VARIO 110 cc motorcycle. Meanwhile, the valves used and compared are Honda Genuine Parts and several brands of aftermarket valves. The results showed that the hardest intake valve head was the Genuine Valve with 61.7 HRA and the hardest exhaust valve head was the NPP with 58.9 HRA. Artikel ini membahas mengenai perbandingan kekerasan beberapa merek katup untuk sepeda motor matic. Penelitian ini menggunakan metode penelitian komparatif. Sepeda motor yang digunakan adalah Sepeda Motor Honda VARIO 110 cc. Sementara untuk katup yang digunakan dan diperbandingkan adalah Honda Genuine Parts dan beberapa merk Katup aftermarket. Hasil penelitian menunjukkan payung katup masuk yang paling keras yaitu payung katup Original 61,7 HRA dan payung katup buang yang paling keras yaitu payung katup NPP 58,9 HRA

Pengaruh Price Discount, Bonus Pack, dan In-store Display Terhadap Keputusan Impulse Buying (Studi KAsus Pembeli Aksesoris Handphone AA Cell di Jalan Jombang Kota Malang)

AbstractThis study aims to find out the effects of price discount, bonus pack, and in-store display to decision impulse buying. This research uses quantitative research by explanatory research method. Sampling is done by purposive sampling with respondents of mobile accessories buyer at the AA Cell Store, amounting to 80 people. The research instrument used is a questionnaire. Data analysis uses a) instrument test that contains validity and reliability tests, b) normality test, c) multiple linear regression test, d) classic assumption test that contains multicollinearity test and heteroscedasticity test, e) hypothesis test which contains F test and t test. The results of simultaneous analysis of price discount, bonus pack, and in-store display significantly influence the impulse buying. While the results of the partial analysis using multiple linear regression tests shows that price discount has a significant effect on impulse buying, while bonus pack and in-store display have no effect on impulse buying.Keywords: Price Discount, Bonus Pack, In-store Display, Decision Impulse Buying, Accessories Costume

Phosphorylation of pregelatinized maranta starch (Maranta arundinaceae L.) as theophyllin tablet matrix controlled release

The present study was carried out to investigate the effect concentration level of pregelatinized and pregelatinized marantha starch phosphate as matrix polymer on the drug release profile. Pregelatinization starch was made by heating suspension of marantha starch with drum dryer. Phosphorylation of pregelatinized maranta starch was prepared by reacting pregelatinized marantha starch with Na2HPO4 and NaHPO4 (2:3). The modified starch product was used as matrices for tablet controlled release separately by direction compression process. Theophyllin was used as a model drug hydrophobic. The dissolution test was carried out separately in 0,1 N HCl (pH 1,8) and in phosphate buffer (pH 7,2), both for 8 hours by using paddle method.The result showed that there was no significant difference (P< 0,05) among the drug release profile from different level concentration of polymeric matrices. The drug release rate was found to be governed by the type and concentration level of polymer in matrix system, polymeric concentration (25%) in matrix, the slower release rate of the drug. Release profile showed a tendency to follow zero-order kinetics from all matrix tablets, and the drug release may be controlled by combination of diffusion and erosion delivery system.Key words: pregelatinized maranta starch phosphate, controlled release, polymeric matrices