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 surabaya,
Jawa timur
INDONESIA
Matematika dan Sains
Published by Universitas Negeri Surabaya
ISSN : -     EISSN : -     DOI : -
Core Subject : Education,
Mathematics
Arjuna Subject : -
Articles 67 Documents
 1   2   3   4   5 
KARAKTERISASI ADSORBEN ZEOLIT YANG DIAKTIVASI Novi Indriyana Lestari, ; Siti Tjahjani,
Matematika dan Sains Vol 16, No 2 (2009)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Reseach was carried out to find the characteristic of zeolite adsorben before and after activated by HCl followed by calcination. Decreasing of metal ion concentration was analyzed using AAS, functional group characterization by IR spectroscopy. Results of research showed that the natural zeolite which activated by HCl 0.2 M indicated the decreasing of Na+ concentration from 3.6875 mg/L to 2.4781 mg/L and for Ca2+ from 1.9214 mg/L to 1.8571 mg/L. The IR spectrum of natural zeolite showed the presence of O-T-O (T = Si atau Al) (1021,2 cm-1 ) and OH (3408.6 cm-1). While the IR spectrum of zeolite H indicated the existence of O-T-O (T = Si atau Al) (1039,4 cm-1), OH of water (3402.3 cm 1) and Si-OH-Al (3543 cm-1 ). The acid-calcinated zeolite showed absorption band at 1035,2 cm-1 (O-T-O, T = Si or Al) and 3399,7 cm-1 (OH of water). After interacted with indigo carmine, the acid-calcinated zeolite showed absorption at 1036.2 cm-1 (O-T-O, T = Si or Al); 3392.2 cm-1 (OH of water), and 1151.7 cm-1 (S=O of sulfate).+ concentration from 3.6875 mg/L to 2.4781 mg/L and for Ca2+ from 1.9214 mg/L to 1.8571 mg/L. The IR spectrum of natural zeolite showed the presence of O-T-O (T = Si atau Al) (1021,2 cm-1 ) and OH (3408.6 cm-1). While the IR spectrum of zeolite H indicated the existence of O-T-O (T = Si atau Al) (1039,4 cm-1), OH of water (3402.3 cm 1) and Si-OH-Al (3543 cm-1 ). The acid-calcinated zeolite showed absorption band at 1035,2 cm-1 (O-T-O, T = Si or Al) and 3399,7 cm-1 (OH of water). After interacted with indigo carmine, the acid-calcinated zeolite showed absorption at 1036.2 cm-1 (O-T-O, T = Si or Al); 3392.2 cm-1 (OH of water), and 1151.7 cm-1 (S=O of sulfate).
KAJIAN PENGGUNAAN REGRESI KOMPONEN UTAMA A&rsquo
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Regression model should be followed many assumes, one of them is collinearity. Variance Inflation factor (VIF) is used to indentify multicollinear case and for handling is needed special analysis, one of them is stepwise regression model and Principal component regression. In this paper shows that the value of R2 from stepwise regression is 91,63% and with principal component regression is 89.8%. So, stepwise regression model better than principal component regression model for handling multicollinear.2 from stepwise regression is 91,63% and with principal component regression is 89.8%. So, stepwise regression model better than principal component regression model for handling multicollinear.
STUDI FOTOLUMINESENSI PADA LAPISAN TIPIS Dwikoranto, ; Munasir,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

It had been grown a thin layer of gallium nitride (GaN) above the substrate sapphire (0001) using unbalanced method DC magnetron sputtering.@Deposition temperature were varied between 630-740 oC.@Study of optical properties of the layers GaN thin measurements was done using fotoluminesensi (PL) at room temperature.@The results of PL measurements showed that the intensity of PL spectrum of the higher by raising the temperature of deposition, which means quality optical properties of GaN thin layers the better. GaN thin layers grown has the optical band gap of ~ 3.4 eV and luminesensi dominant place in the blue region (~2.7eV).@Layer thin GaN has a FWHM ~ 0.421eV for the temperature deposition temperature of 740 oC deposition.oC.@Study of optical properties of the layers GaN thin measurements was done using fotoluminesensi (PL) at room temperature.@The results of PL measurements showed that the intensity of PL spectrum of the higher by raising the temperature of deposition, which means quality optical properties of GaN thin layers the better. GaN thin layers grown has the optical band gap of ~ 3.4 eV and luminesensi dominant place in the blue region (~2.7eV).@Layer thin GaN has a FWHM ~ 0.421eV for the temperature deposition temperature of 740 oC deposition.
SIMULASI PENDULUM TERBALIK (INVERTED PENDULUM) PADA SEBUAH KERETA MENGGUNAKAN BAHASA PEMROGRAMAN MATLAB 7.5 Aditya Prapanca, ; Noor Anita Candra Dewi,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Hanger or pendulum form a thing which to adhere at pivot cart and can to be move with one level freedom (in the same direction or the contrary direction with hand of clock). In principle the inverted pendulum system form which which the characteristic system not stable or non-linear and physical system to do from pendulum, horse-drawn cart or cart and motor DC. The direction from research to conduct is strive for in order that pole inverted pendulum mentioned in order that constant in proportion at inverted position. Because of that, for control the non-linear system to be needed a certain model mathematical which the decrease from relationship fisis system with the conduct vicinity equation movement Lagrange and too conduct linearisasi to be able linear system. The results of this research the obtain that with using method above obvious not yet can result optimal. That is more great alteration mass pendulum, cart and pendulum movement to right with the angle of pendulum speed which stable decrease at inverted position. Whereas at the moment is more great alteration length pendulum, cart and pendulum movement to right with the angle of pendulum speed which stable enough at inverted position.
UPAYA MENINGKATKAN Produktivitas Miselium Lukas S. Budipramana1, ; Gatot Suparno1, ; Isnawati1, ; Igm Sanjaya2,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The aim of the research is to know the natural material which can we use to grow the mycelium and fruit body of tiram putih mushroom (Pleurotus ostreatus). There are three kinds of media in this research, namely the straw, the sawmill powder, and the stem of an ear of corn. The mycelium of tiram putih mushroom could grow in the three kinds of media but the growth acceleration was different. The mycelium of tiram putih mushroom had the best growth acceleration in the sawmill powder media, number two in stem of an ear of corn media and then the straw media. The fruit body production in the straw media was better than that in the sawmill powder media.
PREPARASI PEMBUATAN COCOFOAM DARI SERABUT KELAPA I D. K. Anom, ; Bambang Setiaji, ; Wega Trisunaryanti, ; Triyono,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A preliminary study had been conducted on the making of cocofoam from coco fiber using diluted latex-water mixture. Coco fiber was cleaned and washed, and then dried up in the sun. Then, coco fiber was mixed with diluted latex-water mixture in several weight variations (w/w) 5:3, 5:4, 5:5, 5:6, 5:7 and 5:8. The mixture of coco fiber with the diluted latex-water was molded, and the result was called cocofoam. Cocofoam was vulcanized by using steam with duration variation 30, 60 and 90 minutes. After vulcanization cocofoam was dried up in room temperature for 36 hours. Then, the elasticity test was carried out by giving loads on its surface with weight variation 5, 10, 15, 20, 25, 30, 35, 40, 45 and 50 kg. The result showed that the best quality cocofoam was produced from coco fiber blended with diluted latex-water mixture 5:6. In direct observation, this result didn’t show latex clod on cocofoam product, and the elasticity value was quite good. The C-56 cocofoam vulcanization steamed for 90 minutes showed increasing thickness about 22%, elasticity test showed the decreasing thickness for 2,04% in average, and the C-56 cocofoam density is 0,7905 g/cm3.3.
KARAKTERISASI KONDISI OPTIMUM Aline Puspita Kusumadjaja, ; Juli Astri,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A study to investigate the optimum condition of bromelein enzyme has been carried out. The condition investigated were pH and temperature, based on measurement of enzyme activity which is defined as mmol tyrosin that are released in reaction between bromelein enzyme and casein as substrat per minute. In this research, the bromelein enzyme was isolated from nanas with Cayenne variety, and was partially purified by precipitation method using ammonium sulfat. The work result showed that the optimum condition of bromelein enzyme are in pH 7 with activity 1,368 U/mL, at 55oC with activity 1,282 U/mL.mmol tyrosin that are released in reaction between bromelein enzyme and casein as substrat per minute. In this research, the bromelein enzyme was isolated from nanas with Cayenne variety, and was partially purified by precipitation method using ammonium sulfat. The work result showed that the optimum condition of bromelein enzyme are in pH 7 with activity 1,368 U/mL, at 55oC with activity 1,282 U/mL.
PENGARUH ION Cr (VI) TERHADAP FOTODEGRADASI One Hartawati, ; Rusmini,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Study about effect of Cr (IV) ion concentration to methylene blue photodegradation catalyzed by TiO2 had been done. Photodegradation process was conducted at closed reactor radiated by UV lamp with type B 40 Watt using bath system. The suspency consisting of methylene blue solution, TiO2 powder, and K2Cr2O7 solution were radiated by UV lamp a long with stirring for certain time. Undegradated methylene blue concentration was measured using UV-Vis spectrophotometer, while effect of Cr (VI) ion was determined with comparing differentiated between initial and residual methylene blue concentration. The result of research showed that increasing of ratio of Cr (IV) ion concentration was decreased the degradation of methylene blue concentration. The higher methylene blue photodegradaton (59,660%) was obtained at methylene blue concentration of 10 mg/L, 50 mg of TiO­2 in 50 mL solution, neutral pH, and radiation for 1 hour.2 had been done. Photodegradation process was conducted at closed reactor radiated by UV lamp with type B 40 Watt using bath system. The suspency consisting of methylene blue solution, TiO2 powder, and K2Cr2O7 solution were radiated by UV lamp a long with stirring for certain time. Undegradated methylene blue concentration was measured using UV-Vis spectrophotometer, while effect of Cr (VI) ion was determined with comparing differentiated between initial and residual methylene blue concentration. The result of research showed that increasing of ratio of Cr (IV) ion concentration was decreased the degradation of methylene blue concentration. The higher methylene blue photodegradaton (59,660%) was obtained at methylene blue concentration of 10 mg/L, 50 mg of TiO­2 in 50 mL solution, neutral pH, and radiation for 1 hour.
STUDI PENGARUH TEKANAN OPERASI DAN KOMPOSISI BAHAN PENYUSUN TERHADAP PERMEABILITAS MEMBRAN ULTRAFILTRASI UNTUK Nita Kusumawati,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Detergent is a kind of liquid waste who can give a dangerous effect to environment. The increasing of detergent uses can make eutrofication effect that can block the sunsine dan decrease O2 in the water. A conventional Detergent waste treatment that have been doing all this time, such as aeration, adsorption with active carbon or bentonite and coagulation with salt of carbonate and sulfate give unstatisfied result cause of small reduction power and high operational cost. Because of that, membrane technology hoped can be alternative technology which is easier and cheaper for detergent separation. In this experiment, the ultrafiltration membrane is made of chitosan that was dissolved in formic acid with variation composition of chitosan 1-3 gram in 100 mL of solvent which after that the membrane was applicated to "dead-end" machine to testing membrane permeability in operational pressure 1-3 atm.. The result of experiments showed that increasing of operational pressure make the membrane permeability ascent. But, in the other side, increasing of chitosan composition make this ultrafiltration membrane permeability descent. The optimum conditions was obtained when membrane with chitosan composition 3 gram was applicated in operational pressure 3 atm, which is the value of fluks (permeability) reach out for 30,80 L/m2 day.2 in the water. A conventional Detergent waste treatment that have been doing all this time, such as aeration, adsorption with active carbon or bentonite and coagulation with salt of carbonate and sulfate give unstatisfied result cause of small reduction power and high operational cost. Because of that, membrane technology hoped can be alternative technology which is easier and cheaper for detergent separation. In this experiment, the ultrafiltration membrane is made of chitosan that was dissolved in formic acid with variation composition of chitosan 1-3 gram in 100 mL of solvent which after that the membrane was applicated to "dead-end" machine to testing membrane permeability in operational pressure 1-3 atm.. The result of experiments showed that increasing of operational pressure make the membrane permeability ascent. But, in the other side, increasing of chitosan composition make this ultrafiltration membrane permeability descent. The optimum conditions was obtained when membrane with chitosan composition 3 gram was applicated in operational pressure 3 atm, which is the value of fluks (permeability) reach out for 30,80 L/m2 day.
PRODUKSI ETANOL MENGGUNAKAN Saccharomyces cerevisiae Ari Sudono, ; Surya Rosa Putra,
Matematika dan Sains Vol 17, No 1 (2010)
Publisher : Matematika dan Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The aims of this research were to study the effect of S. cereviseae amobilized at agarose on subtrat consumtion pattern and ethanol production during fermentation process using optimum of agarose concentration, pH, and glucose concentration. The concentration of ethanol and glucose were determined by gas chromatography and Somogyi-Nelson method, respectively. The results of this research showed that the optimum of agarose concentration, pH, glucose concentration, and fermentation time were 3%; 4,5; 10 %; and 31 hours, respectively. During 31 hours, amobilized cell produced ethanol 5,20% (percent yield of 80,3%) and the remaining glucose of 0,03%, while the free cell produced ethanol 3,61% (percent yield of 56%) with the remaining glucose of 1,2%. Thus the amobilized cell could produce ethanol 30% larger than the free cell. The amobilized cell used continuously in four times fermentation only caused degradation of ethanol concentration of 5,1%. The amobilized cell saved for 10 days without medium and nutrition still could produced ethanol of 4,87% and only 7,6 % lower than amobilized cell used directly.

Page 3 of 7 | Total Record : 67

 1   2   3   4   5 

Filter by Year

2009 2011


Reset
Filter By Issues
All Issue Vol 18, No 2 (2011) Vol 18, No 1 (2011) Vol 17, No 2 (2010) Vol 17, No 1 (2010) Vol 16, No 2 (2009) Vol 16, No 1 (2009)