Model Matematis Tentang Aliran Fluida Dan Pengangkutan Energi Dalam Sistem Hidrotermal Dominasi-Uap

Model matematis tentang aliran fluida dan pengangkutan energi diturunkan untuk menggambarkan sistem hidrotermal dominasi-uap. Penggambaran ini dimulai dad persamaan kekekalan massa, momentum, dan energi dalam media berpori. Persamaan ini digabungkan dengan asumsi dan penyederhanaan yang sesuai untuk menghasilkan dua persamaan diferensial parsial taklinear dalam tekanan dan entalpi. Kata kunci: model matematis, aliran fluida, pengangkutan energi, sistem geotermal dominasi ua

Penggunaan Microsoft Excel dalam Analisis Data Eksperimen pada Pembelajaran Fisika

Microsoft Excel is one of the application programs calledspreadsheets, which enable users to supply data and instructionsin the form of commands and formulas to make the desired computationsA spreadsheet is nbt a computer langage used to writea program, it is an application program with which a user canorganize procedures for making calculations in a tabular formMicrosoft Excel is a powerhl program that can be used toanalyze data of an experiment in physics This applicationprogram is quite easy lu use and it is supported by adequate internalutilities for making calculations and graphs.Many kinds of data from experiments in physics can be analyzedwith the help of the application program Microsoft Excel.Various calculations can be done rapidly and easily by putting touse the internal hnctions in this application program An analysisfitting a curve to batches of experimental data can also bedone by using the graph utilit

DOSE ANALYZE OF BORON NEUTRON CAPTURE THERAPY (BNCT) AT SKIN CANCER MELANOMA USING MCNPX WITH NEUTRON SOURCE FROM THERMAL COLUMN OF KARTINI REACTOR

This research aims to determine the amount of radiation dose rate that can be accepted and the irradiation time that is required from Boron Neutron Capture Therapy (BNCT) cancer therapy to treat melanoma skin cancer. This research used the simulation program, MCNPX by defining the geometric dimensions of the tissue component, and describing the radiation source that were used. The outputs obtained from the MCNPX simulation were the neutron flux and the neutron scattering dose that came out from the collimator. The value of neutron flux was used to calculate the dose which comes from the interaction between the neutron and the material in the cancer tissue. Based on the results of the research, the dose rate to treat cancer tissue for boron is 10 μg/g of tumor, which translates to about 0.019241 Gy/second and  requires 25.98 minutes of irradiation time, 15 μg/g of tumor translates to 0.021854 Gy/second and requires 2.,87 minutes, 20 μg/g of tumor translates to 0.022902 Gy/second and requires 21,83 minutes, 25 μg/g of tumor translates to 0.0271275 Gy/second and requires 18.43 minutes, 30 μg/g of tumor translates to 0.0297658 Gy/second and requires 16.79 minutes, and 35 μg/g of tumor translates to 0.0343472 Gy/second and requires 14.55 minutes . The irradiation time needed for cancer tissue is shorter when boron concentration greater at the cancerous tissue

Developing the student worksheet with problem-solving approach to improve critical thinking skills and the concept understanding of physics

The study aimed to investigate the quality of the developed student worksheet with a problem-solving approach in line to the determined criteria and the improvement of students’ critical thinking skills and the conceptual understanding of physics by implementing the student’s worksheet. This study was a research and development study by applying the development model by Borg & Gall. The try out subjects of validation product were students of grades X and XI of MAN (Islamic High School) Yogyakarta III. The data collection techniques used validation sheets, observation sheets, evaluation sheets of student’s worksheet, and tests. The product of this research was student’s worksheet with a problem-solving approach on the topic of optical instruments for grade X of senior high school. The evaluation of student’s worksheet by experts, teachers, peer reviewers, and students are at the best categories for learning, construct, and technical aspects. The gained standard score of students’ conceptual understanding and students’ critical thinking skills for grade X who learned through student’s worksheet with a problem-solving approach, called treatment class, were higher than students who learned without student’s worksheet with a problem-solving approach, called control class

THE DOSE ANALYSIS OF BORON NEUTRON CAPTURE THERAPY (BNCT) TO THE BRAIN CANCER (GLIOBLASTOMA MULTIFORM) USING MCNPX-CODE WITH NEUTRON SOURCE FROM COLLIMATED THERMAL COLUMN KARTINI RESEARCH NUCLEAR

This research was aimed at discovering the optimum concentration of Boron-10 in concentrations range 20 µgram/gram until 35 µgram/gram with Boron Neutron Capture Therapy (BNCT) methods and the shortest time irradiation for cancer therapy. The research about dose analysis of Boron Neutron Capture Therapy (BNCT) to the brain cancer (Glioblastoma Multiform) using MCNPX-Code with a neutron source from Collimated Thermal Column Kartini Research Nuclear has been conducted. This research was a simulation-based experiment using MCNPX, and the data was arranged on a graph using OriginPro 8. The modelling was performed with the brain that contains cancer tissue as a target and the reactor as a radiation source. The variations of Boron concentrations in this research was on 20, 25, 30 and 35 μg/gram tumours. The outputs of MCNP were neutron scattering dose, gamma ray dose and neutron flux from the reactor. Neutron flux was used to calculate the doses of alpha, proton and gamma rays produced by the interaction of tissue material and thermal neutrons. Based on the calculations, the optimum concentration of Boron-10 in tumour tissue was for a 30 µg/gram tumour with the radiation dose in skin at less than 3 Gy. The irradiation times required were 2.79 hours for concentration 20 μg/gram ; 2.78 hours for concentration 25 μg/gram ; 2.77 hours for concentration 30 μg/gram ; 2.8 hours for concentration 35 μg/gram

Developing the student worksheet with problem-solving approach to improve critical thinking skills and the concept understanding of physics

The study aimed to investigate the quality of the developed student worksheet with a problem-solving approach in line to the determined criteria and the improvement of students’ critical thinking skills and the conceptual understanding of physics by implementing the student’s worksheet. This study was a research and development study by applying the development model by Borg & Gall. The try out subjects of validation product were students of grades X and XI of MAN (Islamic High School) Yogyakarta III. The data collection techniques used validation sheets, observation sheets, evaluation sheets of student’s worksheet, and tests. The product of this research was student’s worksheet with a problem-solving approach on the topic of optical instruments for grade X of senior high school. The evaluation of student’s worksheet by experts, teachers, peer reviewers, and students are at the best categories for learning, construct, and technical aspects. The gained standard score of students’ conceptual understanding and students’ critical thinking skills for grade X who learned through student’s worksheet with a problem-solving approach, called treatment class, were higher than students who learned without student’s worksheet with a problem-solving approach, called control class