1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
SISTEM MONITORING MATERIAL CLOGGING PADA REAKTOR LOW LINIER DENSITY POLYETHYLENE DENGAN RADIASI GAMMA
Full text linkMATERIAL CLOGGING MONITORING SYSTEM IN LOW LINIER DENSITY POLYETHYLENE REACTOR USING GAMMA RADIATION. The clogging monitor system of LLDPE (Low linier density polyehilene) has been constructed using absorption gamma radiation methode. The gamma source 137Cs puts in the centre of the proces LLDPE Reactor and the detectors system (12 detectors) install serounding outside of the LLDPE Reactor process. The detectors system are connected to data acqusition and a computer system, is used to produce two dimentional topography profile. The advantage of this system is both non contact and on line clogging mesurement of reactor process. So it can predict clogging material in advance SISTEM MONITORING MATERIAL CLOGGING PADA REAKTOR LOW LINIER DENSITY POLYETHYLENE DENGAN RADIASI GAMMA. Telah dikonstruksi sistem monitor clogging reaktor proses pada pembuatan biji plastik jenis LLDPE (low linier density polyethilene) menggunakan metoda absorpsi radiasi gamma. Dengan menempatkan sumber radiasi gamma tepat ditengah bejana (reaktor) proses, sedangkan pancaran radiasi gamma yang keluar dari sumber gamma jenis 137Cs itu, dideteksi oleh detektor yang berada disekeliling luar bejana proses, yang berjumlah 12 unit detektor, hasil dari pengolahan signal dari ke duabelas detektor oleh komputer memberikan informasi dinamis keadaan material proses didalam bejana (reaktor) proses, Sedangkan profil tampilan monitor hasil pengukuran berbentuk topografi dua dimensi. Keunggulan sistem ini bila dibandingkan sistem yang lain yaitu dapat digunakan secara on line untuk memonitor fluktuasi meterial didalam bejana proses tanpa kontak langsung dengan material proses dan sekaligus dapat digunakan untuk memprediksi kemungkinan terjadinya clogging pada saat proses berlangsun
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
RANCANG BANGUN MODUL PENCACAH 16 BIT 3 INPUT DENGAN KOMUNIKASI TCP/IP UNTUK PORTAL MONITOR RADIASI PMR15
Full text linkABSTRAK RANCANG BANGUN MODUL PENCACAH 16 BIT 3 INPUT DENGAN KOMUNIKASI tcp/ip UNTUK PORTAL MONITOR RADIASI PMR15. Sejak tahun 2014 PRFN-BATAN telah mengembangkan portal monitor radiasi. Pada tahun 2015 dilakukan rancang bangun sistem portal monitor non spektroskopi yang memerlukan modul pencacah dengan lebar data 16 bit, sehingga cukup untuk mencacah paparan radiasi besar terdeteksi oleh detektor gamma. Desain modul pencacah pada PMR15 membutuhkan 3 input pencacah, tujuannya untuk melakukan pencacahan pada 3 (tiga) level energi, yaitu energi rendah, sedang dan tinggi. Kombinasi ini nantinya akan digunakan pada algoritma untuk menentukan tingkat alaram palsu. Modul pencacah menggunakan 3 (tiga) mikrokontroller terprogram saling terhubung melalui jalur I2C (master-slave). Agar dapat mengirimkan data dengan jarak lebih dari 100 meter digunakan komunikasi TCP/IP. Dari hasil uji fungsi diperoleh bahwa data dari modul pencacah dapat dipantau melalui browser atau perangkat lunak lainnya melalui komunikasi TCP/IP dan dapat merespon jumlah cacahan sesuai dengan data input dengan rata-rata nilai error/faktor koreksi antara ± 0,08 % s.d ± 1,02 %.Kata kunci: Modul Pencacah 16 bit , TCP/IP, Portal Monitor Radiasi ABSTRACTA DESIGN AND CONTRUCTION OF 3 INPUT 16 BIT COUNTER MODULE WITH TCP / IP COMUNICATION FOR RADIATION PORTAL MONITOR PMR15. Since 2014 PRFN-BATAN has developed a radiation portal monitor. By 2015 the design of the system is done for non spectroscopy portal monitors that require counter module with a data width of 16 bits, which are sufficient for counting large radiation exposure that was detected by a gamma detector. The design of counter module in PMR15 takes 3 counter inputs, in order to carry out the counting at three (3) energy level, that is low, medium and high energy. This combination will be used in an algorithm to determine the rate of false alarms. Counter module uses three (3) programmable microcontrollers connected to each other through the I2C (master-slave). To be able to transmit data over a distance of 100 meters TCP / IP communication is used. From the function test results show that the data of the module counter can be monitored through a browser or other software via TCP / IP communication and be able to respond to the number of counts in accordance with the input data with the average value of the error / correction factor between + - 0.08% to + - 1.02%.Keywords: 16 BIT Counting Modul, TCP/IP, Radiation Portal Monito
PERANCANGAN MODUL SISTEM DETEKSI DAN TRANSMITTER SIGNAL PADA PERANGKAT ANALISA UNSUR DENGAN TEKNIK XRF UNTUK INDUSTRI
Full text linkABSTRAKPERANCANGAN MODUL SISTEM DETEKSI DAN TRANSMITTER SIGNAL PADA PERANGKAT ANALISA UNSUR DENGAN TEKNIK XRF UNTUK INDUSTRI. Pengukuran gramatur kertas (basis weight), kelembaban (moisture), dan kadar abu (ash content) secara on-line diperlukan untuk menjamin kualitas produksi di industri kertas. Analisa unsur dengan teknik XRF (X-Ray Fluorescence) dapat diaplikasikan untuk melakukan pengukuran unsur terutama yang mempengaruhi kadar abu dan aditif seperti clay, TiO2 dan CaCO3. Pengukuran secara on-line dengan pemroses mikrokontroller dapat menghemat waktu dan mengoptimalkan pemakaian aditif. Data hasil pembacaan sensor dari detektor oleh mikrokontroller dan modul transmitter signal di proses menjadi keluaran dengan standar arus 4 – 20 mA. Sinyal dikonversi menjadi nilai digital, dan dilakukan perhitungan di modul mikokontroller. Data selanjutnya dikirim ke komputer Data Logger menggunakan standar arus. Hasil rancangan detektor gross counting telah diuji dengan nilai penyimpangan terbesar 0,79 %. Digunakan detektor gross counting Scionix dengan sumber radioaktif 137Cs. Kata kunci: sistem deteksi, transmitter signal, XRF_industri ABSTRACTDESIGN OF DETECTION SYSTEM AND TRANSMITTER SIGNAL ON ANALYSIS OF ELEMENTS BY XRF TECHNIQUE FOR INDUSTRIAL. Measurement of paper gramatur (weight basis), moisture, and ash content on-line is necessary to ensure the quality of production in the paper industry. Element analysis with XRF techniques (X-Ray Fluorescence) can be applied to measurement of elements affecting the concentration of ash and additives such as clay, TiO2 and CaCO3. On-line measurements with a microcontroller processor can save time and optimize the use of additives. The data from the sensor of the detector by the microcontroller and signal transmitter module are processed into the current standard 4-20 mA. The signal is converted into a digital value, and a calculation is done in the microcontroller module. The data are then sent to a computer using a standard Data Logger. The gross counting detector design has been obtained and tested with the result that the greatest deviation value of 0.70%. Scionix gross counting detector is used with a radioactive source 137Cs. Key words: detection system, transmitter signal, XRF industr
PEREKAYASAAN SISTEM PENCITRAAN MATERIAL DI DALAM REAKTOR PETROKIMIA DENGAN TEKNIK SERAPAN SINAR GAMMA
Full text linkFormation material contained in petrochemical reactor composed of ethylene gas, hydrogen gas and diluent, gas once it is processed at a pressure of 32 bar and a temperature of between 60 º C to 100 º C will produce hydrocarbons. The hydrocarbons die in the form of slurry with a density of between 600 gr/dm3 to 1200 gr/dm3, In the uncontrolled process the hydrocarbons will clot and causing reactor operation stopped because clogged by the clot material. In order the material not to clot, it required imaging detection system that describes the condition of the material in the reactor. Nuclear aplication method to describe the condition of the material in the reactor is simply by gluing several gamma detector outside the walls of the reactor and placing a 137Cs gamma sources amid type reactor process. It has been designed a prototype imaging system with the material in the petrochemical reactor gamma ray absorption technique composed of 137Cs gamma radiation source which is placed in the middle of the reactor, while the gamma radiation that comes out of the gamma source detected by a detector located outside the vessel surrounding the process. There are 12 gamma detectors and the gamma radiation intensity received is proportional to the fluctuation of the material contained within the reactor process. The results of measurements of the twelve detectors are processed by computer to be its dynamic state information material in the reactor process, while the profile monitor display measurement results in the form of two-dimensional topography. PEREKAYASAAN SISTEM PENCITRAAN MATERIAL DI DALAM REAKTOR PETROKIMIA DENGAN TEKNIK SERAPAN SINAR GAMMA, Formasi material yang terdapat di dalam reaktor petrokimia terdiri dari gas ethylene, gas hidrogen dan gas diluent, setelah diproses pada tekanan 32 bar dan temperatur antara 60ºC sampai 100ºC membentuk senyawa hidrokarbon. Senyawa hidrokarbon yang terbentuk berupa slurry dengan densitas antara 600 gr/dm3 sampai 1200 gr/dm3, bila hasil prosesnya tidak terkendali maka senyawa hidrokarbon yang terbentuk akan menggumpal, serta menyebabkan operasi reaktor terhenti karena tersumbat oleh material yang menggumpal. Agar material tidak sampai menggumpal diperlukan sistem deteksi pencitraan yang menggambarkan kondisi material di dalam reaktor. Metoda teknik nuklir dapat menggambarkan kondisi material di dalam reaktor hanya dengan menempelkan beberapa detektor gamma di luar dinding reaktor serta menempatkan sebuah sumber gamma di tengah reaktor. Telah dirancang prototip sistem pencitraan material di dalam reaktor petrokimia dengan teknik serapan sinar gamma yang tersusun dari sumber radiasi gamma 137Cs yang ditempatkan di tengah reaktor. Pancaran radiasi gamma dari sumber gamma dideteksi oleh detektor yang berada disekeliling luar bejana proses, yang berjumlah 12 unit detektor gamma. Intensitas radiasi gamma yang diterima akan sebanding dengan fluktuasi material yang terdapat di dalam reaktor. Hasil pengukuran dari ke duabelas detektor, oleh komputer akan diolah untuk memberikan informasi dinamis keadaan material di dalam reaktor dengan profil tampilan monitor hasil pengukuran berbentuk topografi dua dimensi
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