Scanning Hall Probe Microscopy (SHPM) using quartz crystal AFM feedback

[No abstract available

Peningkatan Kemurnian Radiokimia Iodium-125 Produksi PRR Dengan Natrium Metabisulfit Dan Reduktor Jones

Radioisotop 125iodium cukup dikenal luas manfaatnya, diantaranya adalah sebagai Perunut (tracer) kit RIA/IRMA untuk deteksi in-vitro berbagai penyakit, sebagai sumber radiasi dalam brachytherapy penyakit kanker, sebagai Perunut binding assay dalam berbagai penelitian bioteknologi. Beberapa tahun lalu untuk memenuhi kebutuhan dalam negeri 125I masih diimpor. BATAN, telah memiliki fasilitas produksi radioisotop 125I, tetapi sampai dua tahun terakhir selain efisiensi produksi belum optimal, kualitas produk belum memenuhi persyaratan untuk banyak keperluan di atas. 125I yang digunakan pada bidang kesehatan dalam bentuk larutan Na125-I harus memiliki kemurnian radiokimia tinggi (>95 %) agar mendapatkan hasil penandaan yang baik. Dengan demikian perlu dilakukan peningkatan kemurnian radiokimia 125I- dengan mengurangi pengotor radiokimia yang berasal pengotor ion iodat dan ion periodat. Pada penelitian ini digunakan Na2S2O5 dan reduktor Jones untuk mereduksi ion iodat dan ion periodat menjadi ion iodida. (Na125-I) produksi PRR-BATAN sampai batas yang diharapkan. Pada percobaan ini diperoleh kemurnian radiokimia 125I- 91,49 % dengan penambahan Na2S2O5 0,1 N volume 6 uL, dan 95,16% dengan volume 8 uL. Penggunaan Na2S2O5 dengan konsentrasi 0,3 N volume 2 uL diperoleh kemurnian radiokimia 99 % sedangkan volume 4 uL, 6 uL, dan 8 uL menghasilkan kemurnian radiokimia 100 %. Sedangkan penggunaan reduktor Jones menghasilkan kemurnian radiokimia 125I- yaitu 99,83 %

On the formulation of parallel position/force control schemes for industrial manipulators

In this paper, three commonly-used position/force control schemes namely Impedance, Admittance and Hybrid Position/Force control are investigated for use in industrial manipulators. In order to eliminate the instability problem that may occur in the customary versions of these schemes for large position errors, a modification is proposed, which is based on determining the joint-space position errors using inverse kinematic solutions rather than using the inverse Jacobian matrix. The feasibility of this modification relies on the fact that almost all of the industrial manipulators have easily obtainable inverse kinematic solutions. The simulation results showing the performance of the modified control schemes are also presented as applied on a Puma 560 manipulator

STUDI KOMPARATIF PENERAPAN METODE HIERARCHICAL, K-MEANS DAN SELF ORGANIZING MAPS (SOM) CLUSTERING PADA BASIS DATA

This study identifies the results of some test results clustering methods. The data set used in this test method Clustering. The third method of clustering based on these factors than the size of the data set and the extent of the cluster. The test results showed that the SOM algorithm produces better accuracy in classifying objects into matching groups. K-means algorithm is very good when using large data sets and compared with Hierarchical SOM algorithm. Hierarchical grouping and SOM showed good results when using small data sets compared to using k-means algorithm

Pengaruh Kepuasan Kerja Terhadap Disiplin Kerja Dan Komitmen Organisasional (Studi Pada Karyawan Pt.pln (Persero) Distribusi Jawa Timur Area Malang)

The purpose of this research to illustrate and explain : job satisfaction, job discipline and organizational commitment. Kind research used is explanatory research with quantitative approach. Population and sample in this study were all employees of PT. PLN (Persero) Distribution of East Java Malang area amount 70 people. Data collection methods used in this study was a questionnaire. The analysis used in this research is descriptive analysis and path analysis. The results of path analysis indicate: job satisfaction variables have a significant influence and positive impact on job discipline with beta coefficient of 0.653 and a probability of 0.000; job satisfaction variables have a significant influence and positive impact on organizational commitment with a beta coefficient of 0.265 and a probability equal to 0.019; variable job discipline has a positive and significant effect on organizational commitment with a beta coefficient of 0.531 and a probability of 0.000; and the effect of indirect job satisfaction to organizational commitment through job discipline with beta coefficient of 0.347 with a total effect of 0.611

Daya Simpan Benih Jabon Putih [Neolamarckia Cadamba (Roxb.) Bosser] Berdasarkan Populasi Dan Karakteristik Benih (Seed Storability of Jabon Putih [Neolamarckia Cadamba (Roxb.) Bosser] Base on Populations and Seed Characteristics)

Jabon putih [Neolamarckia cadamba (Roxb.) Bosser] has been cultivated in large scale. However it is constrained by the availability of high quality seeds and seed storability information. This study aimed to identify seed storability of jabon putih based on populations and seed morpho-physiological characteristics. Seeds were collected from eight populations, located in eight provinces. Population was a single factor in a completely randomized design for testing the germination characteristics (germination capacity, germination uniformity, germination speed, mean germination time and germination value) before and after storage. Geo-climate and soil macro elements were used as parameters to examine the correlation between environmental factors and seed characteristics before and after storage. Population was significantly correlated with germination characteristics, before and after storage for 54 months. The results indicated that seeds from Pomalaa population had the best germination characteristics, while those from Ogan Kemiring Ilir had the worst germination characteristics. Based on moisture content and storability, jabon putih seed could be categorized as orthodox that can be stored in long time at low temperatures with low moisture content. Geo-climate and soil macro element were not significantly correlated with germination. This result indicated that genetic factor had high contribution to seed storability of jabon putih

Eliciting Mathematical Thinking of Students Through Realistic Mathematics Eucation

This paper focuses on an implementation a sequence of instructional activities about addition of fractions that has been developed and implemented in grade four of primary school in Surabaya, Indonesia. The theory of Realistic Mathematics Education (RME) has been applied in the sequence, which aims to assist low attaining learners in supporting students' thinking in the addition of fractions. Based on the premise that eliciting and addressing learners' alternative conceptions in mathematics is beneficial in assisting them to improve their understanding, the paper seeks to explore the role that RME plays pertaining to this particular supposition. The paper presents and discusses examples of learners' responses to contextual problems given to them during the course of the instructional activities

One-dimensional collision carts computer model and its design ideas for productive experiential learning

We develop an Easy Java Simulation (EJS) model for students to experience the physics of idealized one-dimensional collision carts. The physics model is described and simulated by both continuous dynamics and discrete transition during collision. In the field of designing computer simulations, we discuss briefly three pedagogical considerations such as 1) consistent simulation world view with pen paper representation, 2) data table, scientific graphs and symbolic mathematical representations for ease of data collection and multiple representational visualizations and 3) game for simple concept testing that can further support learning. We also suggest using physical world setup to be augmented complimentary with simulation while highlighting three advantages of real collision carts equipment like tacit 3D experience, random errors in measurement and conceptual significance of conservation of momentum applied to just before and after collision. General feedback from the students has been relatively positive, and we hope teachers will find the simulation useful in their own classes. 2015 Resources added: http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/02-dynamics/46-one-dimension-collision-js-model http://iwant2study.org/ospsg/index.php/interactive-resources/physics/02-newtonian-mechanics/02-dynamics/195-elastic-collisionComment: 6 pages, 8 figures, 1 table, 1 L. K. Wee, Physics Education 47 (3), 301 (2012); ISSN 0031-912

50 nm Hall Sensors for Room Temperature Scanning Hall Probe Microscopy

Bismuth nano-Hall sensors with dimensions ∼50nm × 50 nm were fabricated using a combination of optical lithography and focused ion beam milling. The Hall coefficient, series resistance and optimum magnetic field sensitivity of the sensors were 4 × 10-4 Ω/G, 9.1kΩ and 0.8G/√Hz, respectively. A 50nm nano-Bi Hall sensor was installed into a room temperature scanning Hall probe microscope and successfully used for directly imaging ferromagnetic domains of low coercivity garnet thin films

Variable temperature Scanning Hall Probe Microscopy (SHPM) using quartz crystal AFM feedback

[No abstract available