cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
INDONESIA
SAINS DAN MATEMATIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 169 Documents
 8   9   10   11   12 
Estimasi Model Regresi Linier Dengan Metode Median Kuadrat Terkecil Tarno, Tarno
JURNAL SAINS DAN MATEMATIKA Volume 15 Issue 2 Year 2007
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (500.739 KB)

Abstract

ABSTRAK---Model regresi linier merupakan model yang paling sering digunakan dalam analisis statistika. Model regresi linier ini digunakan untuk menyatakan hubungan fungsional antara satu atau beberapa variabel bebas (prediktor) terhadap satu variabel terikat (respon). Dalam analisis regresi, mengestimasi parameter secara otomatis mengestimasi model regresi. Untuk memperoleh estimasi model regresi dapat dilakukan dengan beberapa metode antara lain: metode kuadrat terkecil, metode maksimum likelihood dan sebagainya. Salah satu metode yang paling populer adalah metode kuadrat terkecil (OLS). Pada prinsipnya metode kuadrat terkecil mengestimasi model regresi dengan meminimalkan rata-rata kuadrat sesatan (MSE). Dalam tulisan ini dibahas suatu metode alternatif untuk mendapatkan estimasi model regresi yaitu metode median kuadrat terkecil (LMS). Pada metode LMS, estimasi model yang diperoleh adalah suatu model yang memiliki median kuadrat sesatan terkecil. Prosedur estimasinya adalah dengan memilih p titik sampel (dengan p: banyaknya parameter di dalam model termasuk intersept) dari n titik sampel hasil pengamatan, kemudian ditentukan suatu persamaan yang melalui p titik tersebut. Setelah diperoleh sejumlah persamaan yang melalui p titik tersebut, kemudian ditentukan median dari residual kuadrat. Persamaan atau model yang diestimasi melalui p titik yang menghasilkan nilai median kuadrat terkecil merupakan model yang terpilih.   Kata Kunci: regresi linier, estimasi parameter, sesatan kuadrat
Adsorption of Indigo Carmine Dye using Cetyltrimethylammonium Bromide (CTAB) Surfactant Modified Zeolite Fauziyah, Nurul; Sriatun, Sriatun; Pardoyo, Pardoyo
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 4 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (538.429 KB)

Abstract

Research of indigo carmine dye adsorption using natural zeolite modified by cetyltrimethylammonium bromide (CTAB) surfactant has been done. The purpose of this study was to modify the natural zeolite using CTAB surfactant and to determine its ability on the adsorption of indigo carmine dye. The stages of the study included the activation of zeolites, modifying zeolites using CTAB surfactant and adsorption test of indigo carmine dye. The results showed that the zeolites could be modified by CTAB. They were then characterized by the existence of FTIR absorption band at wavelengths of 1404.18 cm-1 and 2800-3000 cm-1. The various concentration of indigo carmine (5, 10, 15, 20 ppm); contact time (15, 30, 45 minutes) and pH (3, 4, 5, 6, 7, 8, 9) were studied and the highest condition was reached at the 45 minutes, pH= 3 and indigo carmine concentration of 20 ppm for 0.5 and 1 mM CTAB (15.35% and 23%) and indigo carmine concentration of 5 ppm for 10 mM CTAB (96.18%). The adsorption of indigo carmine tended to increase with increasing the concentration and contact time and decreased with increasing the pH.
Simulasi Pengaruh Kombinasi Target-Filter Tambahan Terhadap Spektrum Sinar-X pada Tabung Pesawat Mammografi dengan Program EGSnrc Budiwati, Trisna; Anam, Choirul; Setiawati, Evi
JURNAL SAINS DAN MATEMATIKA Volume 19 Issue 1 Year 2011
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2970.442 KB)

Abstract

The mammography use the specific x-ray energy. At high x-ray energies (>35 keV) the subject contrast between the normal and malignant tissues in the breast is poor, at very low x-ray energies (10-15 keV) the contrast is highest, however the high absorption result in a high tissue dose. To achieve to good result must be used the optimal energy, that could be achieved by using specific x-ray target and additional filter materials to generate characteristic x-ray of the desired energy. This research was aimed to evaluate the influence of target-additional filter combination and filter thickness to the x-ray energy spectrum. The research was conducted by Monte Carlo simulation using EGSnrc program. The model of mammography tube was designed by BEAMnrc program, and phase space file was resulted by BEAMnrc was analyzed by BEAMDP. The tube x-ray contained of target and additional filter from molybdenum (Mo) and rhodium (Rh) material, window from berrylium, and collimator from Pb. Target-additional filter combination were Mo-Mo, Mo-Rh, Rh-Rh and Rh-Mo.  Variation of additional filter thickness that be used are 0,001 mm; 0,03 mm; and 0,05 mm. The results of the simulation indicated that an x-ray consist of bremmstrahlung and characteristic. X-ray spectrum were produced by Mo target had characteristic x-ray energy 17 keV and 19 keV, and Rh target had characteristic energy 20 keV and 23 keV. Target-additional filter combination that allowed are Mo-Mo, Mo-Rh, and Rh-Rh combination. Rh-Mo combination could not be used, because Mo filter would attenuated x-ray characteristic energy. For the Mo-Mo and Rh-Rh, the thicker the additional filter then the x-ray spectrum obtained has a more narrow, but the reduced intensity of the x-ray bremmstrahlung and characteristic.   Keywords: target-filter combination, x-ray spectrum, mammography, EGSnrc.
Deteksi Jenis Padi Indica dan Japonica Padi Gogo Rancah Beras Merah Varietas Slegreng dan Mandel Berbasis Fragmen ORF100 dan ORF29 Haryanti, Wahyu Dewi U.; Kusumaningrum, Hermin P.; Budiharjo, Anto
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 4 Year 2013
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3251.83 KB)

Abstract

Deteksi fragmen Open Reading Frame (ORF)100 dan ORF29 telah dilakukan pada dua jenis padi gogo rancah beras merah yaitu varietas Slegreng dan Mandel. Metode penelitian dilakukan dengan cara isolasi DNA kloroplas padi diikuti dengan amplifikasi PCR menggunakan optimasi suhu annealing pada tiga suhu yang berbeda, yaitu 53°C, 55°C, dan 56°C. Selanjutnya hasil amplifikasi divisualisasikan menggunakan elektroforesis pada gel agarose 1%. Suhu annealing 53°C merupakan suhu yang optimal untuk memperlihatkan fragmen ORF100 dan ORF29. Hasil penelitian menunjukkan bahwa fragmen ORF100 dan ORF29 dapat teramplifikasi pada padi Slegreng dan mandel, sehingga kedua jenis padi tersebut menunjukkan kecenderungan subspesies japonica. Perbedaan ketebalan dan ukuran pita tidak mempengaruhi keberadaan fragmen ORF100 dan ORF29 sebagai penanda untuk mengidentifikasi tipe indica atau japonica. Pemanfaatan marka molekuler fragmen ORF100 dan ORF29 dalam mendeteksi jenis padi diharapkan dapat melengkapi hasil karakterisasi dan pengelompokkan varietas padi berdasar karakter morfologi dan fisiologi.   Keywords: chloroplast DNA, ORF100, ORF29, indica-japonica differentiation
EFFECT QUIXALUD ADDITTON ON FOOD PREFERENCE AND RESISTANCE FROM DEGRADATION Izzati, Munifatul
JURNAL SAINS DAN MATEMATIKA Volume 18 Issue 1 Year 2010
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1995.878 KB)

Abstract

ABSTRACT---We  investigate  the  effect  of  quixalud  on  food  preference  and  resistance  from degradation.  Quixalud  was  choosen  because  of  its antimicrobial  properties  but it  is not an antibiotic.  The aim of this research  is to  evaluate  the effect of  quixalud addition on food preference  by tiger shrimp and its resistant from degradation.  The experiment  was designed  using Factorial with  two treatments:  quixalud concentration  and soaking  period.  We used  three  concentration  of quixalud:  30 ppm 60 ppm and  90 ppm.  Each  concentration  were soaked  at  difference  period  of time, which were:24  hours,  48 hours  and  72 hours.  Food  preference  and  resistance from  degradation were monitored. Results indicated that  there was no  different  of  shrimp  food  preference between  quixalud feed and controls or  feed without quixalud.  However,  there was a tendency  that shrimp preferred  feed  with 60 ppm of quixalud.  Quixalud  has  no effect  on  the  remaining  solid  feed. It seem  likely that the remaining solid feed  is mainly affected by the strength  of binder rather  than  the presence  of an antibacterial compound,  such  as  quixalud.Keywords  : quixalud, food preference, resistance, degradation.Permalink : http://ejournal.undip.ac.id/index.php/sm/article/view/3114
Geochemistry of Three Spots on Stream Water around Gedongsongo Hot Springs Aminin, Agustina L. N.; Suhartana, Suhartana; Sriatun, Sriatun; W., Didik S.
JURNAL SAINS DAN MATEMATIKA Volume 21 Issue 4 Year 2013
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3107.652 KB)

Abstract

Study on the physical characteristics, chemical content of water as well as microbiological composition in the area of ​​geothermal hot springs in Gedongsongo have been done. Water samples were collected on the area within streaming water with moderate temperature. The selection was done on the basis of water that will enter into agricultural and residential areas. Water analysis includes physical analysis, such as temperature, water clarity and odor. While the chemical analysis comprised the oxide content of Mg and Ca. Anion analysis was also performed as sulfate, phosphate, bicarbonate and chloride. The microbiological composition performed using SSCP method for community analysis. The results showed a correlation between the temperature and the content of the anions. The higher temperature of water showed the higher level of anions. The existence of the metal oxide is directly proportional to the levels of the anions. The lower acidity of water showed the higher the levels of hydrogen sulfide. Bacterial composition based on SSCP profile showed a slight different of diversity.
Perbandingan Kadar Garam Natrium dan Kalium pada Tes Ferning Lendir Mulut Mardiati, Siti Muflichatun
JURNAL SAINS DAN MATEMATIKA Volume 15 Issue 1 Year 2007
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (337.52 KB)

Abstract

ABSTRACT---The objective of this study was to know natrium and potassium levels of oral mucus ferning test. The object were 30 women, that were taken their oral mucus once within the 6th to 19th day of menstruation. The ferning test of oral mucus were examined with light microscope. The data distribution was analized by Kolmogorf – Smirnov, followed by non – parametric statistics. The mean, median and standard deviation were calculated with descriptive analysis. The Wilcoxon signed rank test was used to analyze the differentiation between the natrium and potassium levels of oral mucus in groups. The result of this study shows that the oral mucus potassium level is higher than natrium level. It means that potassium more important than natrium in the oral mucus ferning test.   Keywords : potassium, natrium, ferning score, oral mucus
The Potential Test of Fungal Antagonist Trichoderma viride to inhibit the Growth of Pathogenic Fungi Fusarium moniliforme and Alternaria solani In-Vitro Purwantisari, Susiana; Evendi, Agus
JURNAL SAINS DAN MATEMATIKA Volume 23 Issue 3 Year 2015
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (481.695 KB)

Abstract

Fusarium moniliforme and Alternaria solani are two types of mold which often cause the diseases of cultivated plants. Fusarium moniliforme causes the ear rot disease on corn and the wilt disease of Solanaceae family. Whereas the pathogenic fungus Alternaria solani causes an early bright disease on the onion and potato. This aim of this study was to determine the ability of fungal antagonist Trichoderma viride in inhibiting the growth of Fusarium moniliforme and Alternaria solani in vitro. The growth inhibition ability test were conducted on dual cultures by growing the fungal antagonists with pathogenic fungi in Petri dish containing potato dextrose agar media face-to-face in a distance of 3 cm. Percentages of the growth inhibiting were observed every day in 7 days incubation. The results showed that the fungal antagonist T. viride exhibited the highest inhibition on F. moniliforme in 3 days incubation period which was 63.07 %. Yet the highest inhibition against A. solani was in 2 days incubation period which was 57.35 %. T. viride growth continued to increase since the first day until the seventh day incubation period but contrarily the growth of both pathogenic fungi underwent inhibition. This suggested that T. viride was potential as a biological control agent of F. moniliforme and A. solani growth and have a potency as an active bio fungicide ingredient. Keywords: Dual culture; percentage inhibiting; Trichoderma viride; Alternaria solani; Fusarium moniliforme
SISTEM MONITORING KEAMANAN KANDANG SAPI BERBASIS BORLAND DELPHI 7.0 Annisa, Nur; Danusaputro, Hernowo
JURNAL SAINS DAN MATEMATIKA Volume 18 Issue 4 Year 2010
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3470.786 KB)

Abstract

ABSTRACT--A software for the cow shed security system has been made with Borland Delphi 7.0.This program can observe a cow shed security optimally.The cow shed security monitoring system is done byusing LDR (Light Dependent Resistor) censor. Borland Delphi 7.0 program will display the cow shed securitymonitoring result from a data which sent by a censor. Beside that, this software programming uses BorlandDelphi 7.0 which connecting to Microsoft Access 2007 as a data saving. From this software making which hasbeen done, we had the result that this system can monitoring the cow of shed by LDR (Light Dependent Resistor)censor. Testing result shows that if someone try to enter the cow shed area, automatically LDR (Light DependentResistor) censor will detects and showed software on PC or laptop. Beside that, we will hear the sound of alarmas early warning system.KeyWords: Cow shed, Borland Delphi7.0, database.
Pengaruh Perubahan Tegangan Tabung (kVp) Terhadap CT Number dan Uniformitasnya pada Pesawat CT Scan S., Anugrah Ariyani; Setiabudi, Wahyu; Anam, Choirul
JURNAL SAINS DAN MATEMATIKA Volume 20 Issue 3 Year 2012
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2813.475 KB)

Abstract

An examination of consistency of CT numbers and its uniformity due to variation of the tube voltage has been done. The examination was conducted using water and polyethyelene phantoms as a test object. The method of scanning, which are  axial  scanning  and helical scanning. The scanning was taken 5 (five) slices with slice thickness of 5 mm. Variations in  tube voltage used were 80 kV, 120 kV and 140 kV.  The tube current 160 mA and time scanning 2 seconds. It was obtained that the increase in voltage from 80 kV to 140 kV led to increase the value of CT number both for water and polyethylene phantoms. The uniformity of CT number for all ROI varies, but still within the range of tolerance limits. The CT number for the water phantom does not exceed 0 ± 5 HU and for polyethylene phantom does not exceed -300 to -100 HU..   Keywords: CT Scan, CT number, uniformity, tube voltage (kV)

Page 10 of 17 | Total Record : 169

 8   9   10   11   12 

Filter by Year

2006 2015


Reset
Filter By Issues
All Issue Volume 23 Issue 4 Year 2015 Volume 23 Issue 3 Year 2015 Volume 23 Issue 2 Year 2015 Volume 23 Issue 1 Year 2015 Volume 22 Issue 4 Year 2014 Volume 22 Issue 3 Year 2014 Volume 22 Issue 2 Year 2014 Volume 22 Issue 1 Year 2014 Volume 21 Issue 4 Year 2013 Volume 21 Issue 3 Year 2013 Volume 21 Issue 2 Year 2013 Volume 21 Issue 1 Year 2013 Volume 20 Issue 4 Year 2012 Volume 20 Issue 3 Year 2012 Volume 20 Issue 2 Year 2012 Volume 20 Issue 1 Year 2012 Volume 19 Issue 4 Year 2011 Volume 19 Issue 3 Year 2011 Volume 19 Issue 2 Year 2011 Volume 19 Issue 1 Year 2011 Volume 18 Issue 4 Year 2010 Volume 18 Issue 3 Year 2010 Volume 18 Issue 2 Year 2010 Volume 18 Issue 1 Year 2010 Volume 17 Issue 3 Year 2009 Volume 17 Issue 2 Year 2009 Volume 17 Issue 1 Year 2009 Volume 15 Issue 2 Year 2007 Volume 15 Issue 1 Year 2007 Volume 14 issue 4 Year 2006 More Issue