• Foramen Magnum Meningiomas and Its Approaches 

  Dharmajaya, Ridha (2018)

  Introduction: Foramen magnum meningiomas arise from arachnoid at the craniospinal junction. The foramen magnum contains several critical neuroanatomical and vascular structures of which the surgeon must be aware.Classic ...

• Transphenoidal Approach in Sellar Region Tumor 

  Dharmajaya, Ridha (2018)

  IntroductionsEndoscopes have two advantages relative to operating microscopes: they provide a wide panoramic view of the surgical field through a narrow corridor as well as images of the surrounding anatomy, including ...

• Preparation and Characterization of Zinc Oxide Doped with Ferrite and Chromium 

  Ginting, M; Taslima, S.; Sebayang, Kerista; Aryanto, D; Sudiro, T; Sebayang, p (2017)

  In this paper, the effect of doping concentrations of Fe and Cr on ZnO powder was studied by using X-ray diffraction (XRD). The ZnO was doped using solid state reaction method with High Speedshaker Mill (HSM) and ...

• Preparation and Characterization of Fe-Mn-doped Barium Hexaferrite Permanent Magnet 

  Kurniawan, C; Nainggolan, M M; Sebayang, Kerista; Ginting, M; Sebayang, P (2016)

  Barium Hexaferrite-based permanent magnets (BaFe12O19) was known for its high magnetic anisotropy and suitability in broad applications. Some dopants and atomic substitutions have been utilized to improve its properties ...

• Characteristics of B2O3 and Fe Added Into BaFe12O19 Permanent Magnets Prepared At Different Milling Time and Sintering Temperature 

  Sebayang, Perdamean; Sari, Ayu Yuswita; Ginting, Delovita; Allan, Yola; Nasruddin M N; Sebayang, Kerista (2016)

  The objective of present work is to investigate the characteristic of BaFe12O19, B2O3-BaFe12O19 and Fe- BaFe12O19 magnets fabricated at different milling time and sintering temperature. The characteristic of perrmanen ...

• Preparation of Refractory Cordierite Using Amorphous Rice Husk Silica for Thermal Insulation Purposes 

  Sembiring, Simon; Simanjuntak, Wasinton; Situmeang, Rudy; Riyanto, Agus; Sebayang, Kerista (2016)

  This study aims to investigate the effect of sintering temperatures on the phase formation and physical characteristics of refractory cordierite prepared from rice husk silica, Al2O3, and MgO powders.The samples were ...

• Synthesis of Nanorod Ba(Nd)0.015Fe12O19 Using Starch as Template 

  Sebayang, Kerista; Nasruddin MN; Syahwin; Zarlis, Muhammad; Sunendar, Bambang (2017)

  A synthesis of barium hexaferrite doped Nd atom based sol-gel method using chitosan solution as a dispersant and a starch solution as a natural template was performed. As Precursors used Ba(NO3)2, Fe(NO3)3.9H2O and NdCl3.6H2O ...

• Piezoreflectance Study of Nb-doped MoS2 Single Crystals 

  Sebayang, Kerista; Sigiro, Mula (2017)

  We have measured the temperature dependence of the spectral features in the vicinity of direct band-edge excitonic transition of the Nb-doped MoS2 single crystals from 25 to 300 K using piezoreflectance (PzR). The energies ...

• Preparation and Characterization of Microwave-absorption of Sarulla North Sumatra Zeolite and Ferric Oxide-filled Polyurethane Nanocomposites 

  Gultom, Golfrid; Wirjosentono, Basuki; Sebayang, Kerista; Ginting, Masno (2015)

  Microwave-absorptive polymeric composite materials are becoming important to protect interference of any communication systems due to the increase in the use of microwave-inducing devices. In this work, the microwave-absorptive ...

• Cr-Al Coatings on Low Carbon Steel Prepared by a Mechanical Alloying Technique 

  Hia, A I J; Sudiro, T; Aryanto, D; Sebayang, Kerista (2016)

  Four different compositions of Cr and Al coatings as Cr100, Cr87.5Al12.5, Cr50Al50, and Al100 have been prepared on the surface of low carbon steel by a mechanical alloying technique. The composition of each powder was ...

• Microwave Absorption Properties of Polyurethane Foam Nano Composite Filled Aceh Natural Bentonite for Microwave-Absorptive Materials 

  Sebayang, Kerista; Gultom, Golfrid (2017)

  Microwave-absorptive polymeric nanocomposite materials are becoming important to protect devices from radar detection in military application. The lightweight and elastic materials beside excellent microwave absorption ...

• Effect of Sintering Temperature on the Microstructure, Electrical and Magnetic Properties of Zn0.98 Mn0.02o Material 

  Sebayang, Kerista; Aryanto, D; Simbolon, S; Kurniawan, C; Hulu, S F.; Sudiro, T; Ginting, M; Sebayang, P (2018)

  Zn0.98Mn0.02O material was synthesized from ZnO and MnO2 powders using solid state reaction method. The microstructure, electrical and magnetic properties of Zn0.98Mn0.02O were studied as a function of sintering temperature. ...

• Effects of Sintering Holding Time on the Structural, Electrical and Magnetic Properties of Zn0.95Ni0.05O 

  Ginting, M; Aryanto, D; Kurniawan, C; Sari, A Y; Subhan, A; Sudiro, T; Sebayang, P; Tarigan, E R; Nasruddin M N; Sebayang, Kerista (2017)

  Zn0.95Ni0.05O has been synthesized by mixing 5% mol of NiO into ZnO using solid state reaction and high-speed shaker mill method. The samples were sintered at 900 C with holding time for 2, 4 and 8 hours. Crystal ...

• Effects of Natural Zeolite and Ferric Oxide to Electromagnetic and Reflection Loss Properties of Polyurethane Nanocomposite 

  Gultom, G; Wirjosentono, B; Ginting, M; Sebayang, Kerista (2017)

  Microwave-absorptive polymeric composite materials are becoming important to protect interference of any communication systems due to increasing use of microwave-inducing devices. In this work, the microwave-absorptive ...

• Effect of Pyrolysis Temperatures on Composition and Electrical Conductivity of Carbosil Prepared from Rice Husk 

  Simanjuntak, Wasinton; Sembiring, Simon; Sebayang, Kerista (2012)

  The objective of this study was to evaluate the effect of pyrolysis temperatures on composition and electrical conductivity of carbosil produced from rice husk, by conducting pyrolysis experiments at three different ...

• Effect of Platinum loading on Graphene Nano Sheets at Cathode 

  Siburian, Rikson; Sebayang, Kerista; Supeno, Minto; Marpaung, Harlem (2017)

  The effect of Pt loading on graphene nanosheets (GNS) at electrode catalyst fuel cell was carried out. The purpose of this research is to know the effect of Pt loading on GNS and support material for catalytic activity of ...

• Effect of N-Doped Graphene for Properties of Pt/N-Doped Graphene Catalyst 

  Siburian, Rikson; Sebayang, Kerista; Supeno, Minto; Marpaung, Harlem (2017)

  Nitrogen doping into graphene was carried out by heating Graphene Nano Sheets (GNS) in ammonia to produce N-doped graphene (N G). The N G was used as a support material for Pt catalyst as well as a catalyst itself for ...

• Development of Ferrite-Based Permanent Magnet for Water Meter Linflow in Bandung 

  Sebayang, Kerista; Syukur, Mohammad; Nasruddin M. N. (2013)

  A simple application of permanent magnet is flow measurement or tbe water meter manufactured by PT. Multi Lnstrumentasi located at UjlUlg Berwlg, Bandung. Collaborative efforts in permanent magnet technology transfer, ...

• Cr-DOPED ZnO Prepared by Solid State Reaction Method 

  Sebayang, Kerista; Taslima, Saufa; Ginting, Masno; Sebayang, Perdamean; Bukit, Nurdin (2017)

  In this paper, the effect of doped concentrations of Cr at ZnO powder has been studied using structur, magnetic and electrical properties has been investigated by X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer ...

• The Antiapoptotic Effect of Curcumin in the Fibroblast of the Cochlea in an Ototoxic Rat Model 

  Haryuna, Tengku Siti Hajar; Purba, Agustinus Hamonangan Winston; Farhat, Farhat; Alviandi, Widayat (2018)

  Introduction: This study aimed to show the potency of curcumin as an antiapoptotic agent that decreases the apoptotic index in the cochlea lateral wall in ototoxic rat models. Materials and Methods: A total of 24 Rattus ...

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