Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
X-ray Fuorescence spectrometry semakin sering digunakan dalam bidang geokimia. X-Fuorescence spectrometry dikategorikan menjadi dua yakni ? WDXRF (wavelenght ? dispersive X- ray fluorescence spectrometer) dan EDXRF (energy-dispersive X ? ray fluorescence spectrometer). WDXRF dapat berbentuk sebagai sequential spectrometer, simultaneous spectrometer atau kelebihan dari kelebihan keduanya dikombinasikan menjadi satu perangkat yakni hibrid instrument. Masing-masing instrumen XFA mempunyai karakteristika dan kekhusussan dalam penggunaan. Penelitian ini menggunakan sequential spectrometer PW 1450 untuk menganalisis major, minor and trace elements dalam sample. Untuk mengkalibrasi PW 1450 digunakan 30 standar internasional dan 66 standar dari Institut für Mineralogie der Uni. Köln, Germany, yang telah diketahui konsentrasi masing-masing unsurnya. Interelement dan matrix effects dihilangkan dengan cara mencocokkan matrix pada sample dan standar, pengenceran, penambahan konsentrasi unsur-unsur yang dimaksud dalam jumlah tertentu, dan koreksi secara matematik pada saat analisis sedang berlangsung. Ujicoba pada dua sampel dan deskripsi statistik dengan standard deviation dan coefficient of variant menunjukkan bahwa XFA cukup akurat untuk beberapa unsur terutama unsur mayor, tetapi untuk Mg, Ca, K, Na, P, S, Co, Rb, Zn, Ni, Ba, Pb sensivitasnya masih lebih rendah dibandingkan dengan Atomic Absorpsion Spectrometry (AAS), Flame Emission Spectrometer (FES), Inductively Coupled Plasma (ICP) dan photometer.

---

Wavelenght?Dispersive X-Ray Flourescence Accuration. X-Fuorescence spectrometry is a method, which is increasingly applied in the geochemical analysis. X-Fuorescence spectrometry is classified under two categories ? WDXRF (wavelenght ? dispersive X-ray fluorescence spectrometer) and EDXRF (energy-dispersive X ? ray fluorescence spectrometer). WDXRF can be configured as a sequential spectrometer , a simultaneous spectrometer or a hibrid instrument, which combines the advantages of the simultaneous and sequential spectrometers into one instrument. Each instrument is different in some characteristics, and each has applications for which it is specifically suited. In this investigation sequential spectrometer PW 1450 was used to analyze the major, minor and trace elements in the samples. The standards used in calibrating the PW 1450 for the analysis of all samples are materials of known composition (30 internatioanal standards and 66 standards from Institut für Mineralogie der Uni. Köln, Germany). Interelement and matrix effects are treated by matrix matching of samples and standards, dilution, preconcentration of the element of interest, and mathematic corrections during data analysis. The examination of two samples and the statistic description using standard deviation and coefficient of variant show that the XFA is accurate enaugh for many elements, especially for the major elements, but for Mg, Ca, K, Na, P, S, Co, Rb, Zn, Ni, Ba, Pb in comparison with Atomic Absorpsion Spectrometry (AAS), Flame Emission Spectrometer (FES), Inductively Coupled Plasma (ICP) and photometer it is less sensitive. It is posible to devaluate the errors by using coefficient of variant and standard deviation.

Abstrak :
ABSTRAK
Telah dilakukan penelitian pengidentifikasian endoparasit sampel feses Nasalis larvatus, Presbytis siamensis, dan Presbytis comata di Kebun Binatang Tamansari, Bandung. Tujuan penelitian untuk mengidentifikasi keberadaan endoparasit dan membandingkan hasil serta kepraktisan kedua metode. Penelitian dilakukan sejak Desember--Mei 2011 di Laboratorium Kesehatan Hewan. Sebanyak 216 sampel diperiksa terdiri 72 sampel dari masing-masing spesies. Hasil menunjukkan telur Ascaris lumbricoides, Strongyloides stercoralis, dan Trichuris trichiura ditemukan pada sampel feses ketiga spesies primata melalui dua metode. Balantidium coli dan larva Strongyloides stercoralis hanya ditemukan pada Metode Natif. Berdasarkan keanekaragaman spesies endoparasit, Metode Natif mampu dan lebih praktis dalam mendapatkan hasil lebih dibandingkan Metode Pengapungan Dengan Sentrifugasi.

---

ABSTRACT
This research has been conducted to identify endoparasites from fecal samples of Nasalis larvatus, Presbytis comata, and Presbytis siamensis at Kebun Binatang Tamansari, Bandung, using Native and Centrifugation Flotation Methods. The aims of this non-experimental research were to identify the presence of endoparasite and to compare the result between those two methods. This research was conducted since December--May 2011. There were 216 fecal samples observed in this research consist of 72 fecal samples for each species. The result showed that Balantidium coli and Strongyloides stercoralis were only found by using Native method, meanwhile Ascaris lumricoides, Strongyloides stercoralis, and Trichuris trichiura?s eggs were found in almost entire fecal samples that analyzed by Native and Centrifugation Flotation Methods. We can conclude that NativeMethod is much more practical than Flotation Centrifuge Method.

Abstrak :
Telah berhasil dibuat suatu alat yang dapat digunakan untuk mengukur curah hujan dan secara sinergi juga mengukur tingkat keasaman air hujan serta menyimpan data pengukuran parameter tersebut di data logger dan mengirimnya secara periodik ke komputer dan nomor telpon genggam yang sudah ditentukan menggunakan media komunikasi kabel data dan modem GSM. Pengukuran curah hujan menggunakan sensor penakar hujan tipe tipping bucket dengan resolusi 0,2 mm per tipping. Pengukuran tingkat keasaman air hujan menggunakan pH electrode probe dengan resolusi sensor 0,02 pH unit. Untuk akuisisi data digunakan perangkat berbasis mikrokontroler ATmega 128. Penelitian sistem pengukuran yang terintegrasi ini oleh penulis diberi judul "Pengembangan Sistem Peralatan Pengambil Sampel air hujan Otomatis". Diharapkan dengan menggunakan alat ini, maka pengukuran curah hujan dan pemantauan tingkat keasaman air hujan di BMKG akan jauh lebih cepat, mudah dan akurat.

---

Have successfully created a tool that can be used to measure rainfall and in synergy also measured the acidity of rain water and storing the measurement data of these parameters into data logger and periodically sending it to the computer and mobile telephone numbers that have been determined using the data cables and modem GSM. Rainfall measurements using tipping bucket type of rain sensor with a resolution of 0.2 mm per tipping. Measurement of the acidity of rain water using a pH electrode probe with a sensor resolution of 0.02 pH units. Used for data acquisition ATmega 128 microcontroller-based device. Integrated measurement system research by the author entitled "Automatic rain water samples system development". Expected by using this tool, then the rainfall measurement and monitoring of the acidity of rain water in BMKG would be much faster, easier and accurate.