Pengembangan Bahan Ajar Keliling, Luas Persegi Dan Persegi Panjang Dengan Pendekatan Pendidikan Matematika Realistik Indonesia

Penelitian Pengembangan Bahan Ajar Keliling, Luas Persegi dan Persegi Panjang dengan Pendekatan Pendidikan Matematika Realistik Indonesia bertujuan untuk (1) menghasilkan bahan ajar keliling, luas persegi dan persegi panjang yang valid dan praktis yang dikembangkan dengan pendekatan Pendidikan Matematika Realistik Indonesia (PMRI); (2) mengetahui efek potensial bahan ajar keliling, luas persegi dan persegi panjang dari pengembangan bahan ajar berdasarkan pendekatan Pendidikan Matematika Realistik Indonesia(PMRI) terhadap aktivitas dan hasil belajar siswa. Metode penelitian yang digunakan adalah penelitian pengembangan (development research) yang terdiri dari 3 tahap yaitu (1) self evaluation, meliputi tahap analisis dan desain perangkat pembelajaran; (2) prototyping, meliputi tahap evaluasi dan revisi; dan (3) melakukan field test. Pengumpulan data dilakukan dengan cara, observasi, tes dan analisi dokumentasi jawaban siswa. Hasil observasi aktivitas siswa didapat rata-rata aktivitas yaitu 11,99 dengan tingkat aktivitas masuk dalam kategori aktif. Dari hasil tes didapat rata-rata 73,74 yang masuk dalam kategori baik

Analisis Faktor-faktor Kesulitan Belajar Siswa yang Remedial pada Mata Pelajaran Ujian Nasional Siswa Kelas VIII SMP Negeri 3 Tanah Putih

Observations and experiences during this teacher to know the average class VIII studentis always less than the value that has been set in the school(KKM), especially on subjects in the UN. based on that researchers try to do a sudy title and alysis of the factors that cause remedial students in the national examination subjects eighth grade students of SMP 3 Tanah Putih.This study aims 1.What factors cause learning difficulties from internal remedial students. 2. The causes of learning difficulties remedia lstudents from ekstern. metode used in this research is descriptive method with qualitative approach which aims to provide an overview of the factors that cause learning difficulties students. SMP study site is located on land putih. subjek 3 in this study were students of class VIII in the capture with satu rated sample technique. data and data collection tools in the form of a questionnaire was created by the researchers based on the lattice problem with alternative answers very of ten (SS), of ten(S), occasionally(KD), rarely(J), and never (TP). data analysis techniques using benchmarks persentase formula (Anas Sudiyono, 2001:40).Conclusion Theresultsof this study of internal students lack motivation of students (63.81%) students of emotional disorders (61.90%), the physical state of the students (65.27%). the external environment of students from families of (54.79%), in the school environment by (50.10%) and then from the aspect of teachers (58.54%). As a follow up of this study can researchers recommend that in terested parties can provide pasilitas student learning that can motivate students in the learning process. to parents supervise their children are expected to be more submarines are at home. so that the teacher can make a more attractive pembelajaran methods and creative

Local Chicken Management in Rural Borno State,Nigeria

The locally adapted chickens are more readily available to resource-poor farmers and they can be productive without high disease-control inputs. Therefore, the study examined the management practices and the prospects of local chicken production in rural Borno state. The survey was carried out in two agro-ecological zones (Sahel savannah and Sudan savannah) of Borno state in Nigeria. Data were collected from 180 poultry keeping households in two seasons (cold-dry and hot-dry seasons) through interview using structured questionnaire. Descriptive statistics using means and percentage was used to analyze the data. The result showed that 82.8% of the farmers had less than 1ha of farm land and 17.2% had above 1ha of farm land. Distribution of ownership of chickens revealed that 51.3% kept 6-10 chickens, 23.8% kept 1-5 chickens, 19.5% kept 11-20 chickens and 5% kept  above 20 chickens. Majority (65.8%) practice extensive system while 34.2% practice semi-intensive system. Only 2% of the farmers consult veterinary service. Chickens were mainly culled for home consumption (31.5%), trade (42.2%) and fear of disease (26.3%). 46.4% of farmers purchased their replacement stock, 24.1% of the farmers obtained theirs through inheritance or gifts, while 32.9% obtained theirs from hatched eggs. The major (55.8%) factor affecting market is the availability of substitute, 27.9% complained of unstable price while 16.3% identified sell of disease chicken as another factor affecting marketing. The study recommends proper training of the farmers on modern poultry management and they should be informed on the importance of veterinary services. Key words: Local chicken, Management system, Rural, Sahel savannah, Sudan savanna

Identifikasi Fasa Dan Sifat Magnetik Nanopartikel Besi Oksida Teriradiasi

Makalah ini membahas tentang Perubahan fasa nanopartikel magnetik oksida besi setelah mengalami iradiasi dalam reaktor nuklir. Perubahan fasa dianalisis dalam kaitannya dengan Perubahan sifat magnetik yang terjadi. Nanopartikel yang digunakan merupakan hasil proses ko-presipitasi baik dalam bentuk oksida besi murni (OB) maupun yang permukaannya telah dimodifikasi dengan asam nitrat, asam sitrat maupun asam oleat dan membentuk sistem ferrofluid (FF). Nanopartikel awal ini telah dianalisis memiliki fasa gabungan magnetit/maghemit (Fe3O4/γ-Fe2O3). Proses iradiasi dilakukan di Reaktor Serba Guna GAS-BATAN pada fasilitas sistem rabbit dengan fluks neutron sekitar ± 1x1013ncm-2detik-1, selama 5 menit, 10 menit dan 30 menit. Nanopartikel besi oksida hasil iradiasi dikarakterisasi dengan Difraktometer Sinar-X untuk mendapatkan data tentang Perubahan fasa dari nanopartikel. Sifat magnetik dianalisis dari kurva histeresis hasil pengukuran dengan Vibrating Sample Magnetometer. Secara umum hasil analisis menunjukkan bahwa iradiasi mengakibatkan terjadinya Perubahan sebagian fasa besi oksida dari fasa magnetit/maghemit menjadi fasa hematit dengan hasil akhir penurunan sifat magnetik nanopartikel. Nano partikel besi oksida yang dilapisi penstabil asam nitrat atau asam sitrat memiliki ketahanan iradiasi yang lebih baik dibandingkan besi oksida yang dilapisi asam oleat

Flow cytometric analysis of childhood leukemias

Objective: To collect demographic data for childhood (less than 15 years) leukemias in Karachi, describe the accuracy of the cell surface markers routinely used in the flow cytometric analysis of leukemic cells and arrive at an ideal panel of antibodies for analyzing leukemic samiples. Materials and Methods: Data from 62 consecutive cases of childhood leukemias referred to the Department of Pathology, Aga Khan University Hospital. (AKUH) between January 1995 and December 1998 was analyzed using Epi Info Version 6. Flow cytometry on all samples was performed using standard protocols. Results: The mean age of patients was 8.2 years and 49 (79%) were males. Fifty (81%) had acute lymphoblastic leukemias of which 50% were CD1O positive and 24% CD10 negative Pre-B cell leukemias. Among all Pre B cell All 98% were positive for CD19, 96% for CD22, 89% for HLA-DR and 67% for CD10. Of the 10 AML cases, 100% were positive for CD33, 90% for CD13, 80% for CD19 and 70% for HLA-DR. Conclusion: The mean age in this study population was significantly higher and percentage of CD10 positive Pre-B All is lower than that in the West. Both these factors might be responsible for the poorer prognosis of these patients. It is not possible to specify a minimum or maximum panel of antibodies that should be used for phenotyping all cases of childhood leukemias. A certain degree or redundancy is essential in any panel of antibodies used for flow cytometry of leukemias

Development and properties of polymeric nanocomposite coatings

Polymeric-based nanocomposite coatings were synthesized by reinforcing epoxy matrix with titanium nanotubes (TNTs) loaded with dodecylamine (DOC). The performance of the developed nanocomposite coatings was investigated in corrosive environments to evaluate their anti-corrosion properties. The SEM/TEM, TGA, and FTIR analysis confirm the loading of the DOC into the TNTs. The UV-Vis spectroscopic analysis confirms the self-release of the inhibitor (DOC) in response to the pH change. The electrochemical impedance spectroscopic (EIS) analysis indicates that the synthesized nanocomposite coatings demonstrate superior anticorrosion properties at pH 2 as compared to pH 5. The improved anticorrosion properties of nanocomposite coatings at pH 2 can be attributed to the more effective release of the DOC from the nanocontainers. The superior performance makes polymeric nanocomposite coatings suitable for many industrial applications.Qatar University, University of Auckland, Qatar FoundationScopu

Novel hydroxyapatite-based bio-ceramic hollow fiber membrane derived from waste cow bone for textile wastewater treatment

Industrial textile wastewater is toxic due to the presence of recalcitrant color pigments and poisonous heavy metals. In this study, the hydroxyapatite (HAp)-based bio-ceramic hollow fiber membranes (h-bio-CHFM) were developed via the combined phase inversion and sintering technique. It was found that the properties of the developed h-bio-CHFMs were greatly affected by the HAp content of the ceramic suspension, and sintering temperature. The h-bio-CHFM with the sintering temperature of 1200 degrees C exhibited the long rod-shaped HAp particles and the smallest pore size (0.013 mu m). High removals of color (99.9%), COD (80.1%), turbidity (99.4%) and conductivity (30.1%) were achieved using the h-bio-CHFM sintered at 1200 degrees C with stable high flux of 88.3 L/m(2)h. Remarkably, the h-bio-CHFM sintered in the temperature range of 1000-1200 degrees C also demonstrated excellent adsorption ability towards heavy metals with 100% removals. The results of this study show the potential of the h-bio-CHFM for the efficient industrial textile wastewater treatment applications

Studi Eksperimental Nanorefrigeran Tio2-r600a Sebagai Refrigeran Masa Depan

The use of CFC refrigerants (Chloro Fluoro Carbon) leads to destruction of ozone layer and global warming. An alternative refrigerant is hydrocarbon refrigerant, but it has the disadvantage of easily exploded. This experimental study has been conducted to study the effect of addition of TiO2, which are flame retardant, on the performance of hydrocarbon refrigerant R600a (nanorefrigeran TiO2-R600a). Test of Performance conducted according to refrigerants national standards IEC 60335-2-24-2010. The result is R600a-TiO2 is safe and efficient to be used as a refrigerant without any modification on refrigerator. TiO2 increases the thermal conductivity and heat transfer of refrigerant. The best performance is obtained at TiO2 concentration of 1 g / L (COP = 4,821). It is expected that the nanorefrigeran TiO2-R600a can be used as the primary refrigerant in the future that are environmentally friendly and efficient

The Correlation between Leadership Style, Work Motivation and Work Environment with Employee Performance at the Office of the Ministry of Religious Affairs in Alor District - East Nusa Tenggara Province

This study aims to determine the correlation of leadership style with performance, to determine the correlation of work motivation with performance, to determine the correlation of work environment with performance, to determine the leadership style with work motivation, to determine the correlation of leadership style with work environment, to determine the correlation of work motivation with work environment, to determine the correlation of leadership style, work motivation and work environment together with the performance of employees at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province. This type of research is a quantitative description. Samples were taken using accidental sampling. The sample in this study was 61 employees. The data collection tools used are observation, interviews, questionnaires, and literature studies. The data analysis model used to answer the hypothesis is bivariate correlation analysis, multiple correlation, F test and R test using the SPSS version 22 for windows program tool. From the results of the correlation test it can be concluded that, (1 ) there is a correlation between leadership style and employee performance at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (2) there is a correlation between work motivation and employee performance at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (3) there is a correlation between the work environment and employee performance at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (4) there is a correlation between leadership style and work motivation of employees at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (5) there is a correlation between leadership style and the work environment of employees at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (6) there is a correlation between work motivation and the work environment of employees at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province., (7) there is a correlation between leadership style, work motivation and work environment together with the performance of employees at the office of the Ministry of Religious Affairs in Alor District East Nusa Tenggara Province

Use of polyethylene glycol coatings for optical fibre humidity sensing

Humidity induced change in the refractive index and thickness of the polyethylene glycol (PEG) coatings are in situ investigated for a range from 10 to 95%, using an optical waveguide spectroscopic technique. It is experimentally demonstrated that, upon humidity change, the optical and swelling characteristics of the PEG coatings can be employed to build a plastic fibre optic humidity sensor. The sensing mechanism is based on the humidity induced change in the refractive index of the PEG film, which is directly coated onto a polished segment of a plastic optical fibre with dip-coating method. It is observed that PEG, which is a highly hydrophilic material, shows no monotonic linear response to humidity but gives different characteristics for various ranges of humidity levels both in index of refraction and in thickness. It undergoes a physical phase change from a semi-crystal line structure to a gel one at around 80% relative humidity. At this phase change point, a drastic decrease occurs in the index of refraction as well as a drastic increase in the swelling of the PEG film. In addition, PEG coatings are hydrogenated in a vacuum chamber. It is observed that the hydrogen has a preventing effect on the humidity induced phase change in PEG coatings. Finally, the possibility of using PEG coatings in construction of a real plastic fibre optic humidity sensor is discussed. (C) 2008 The Optical Society of Japan