1,720,955 research outputs found
KECEPATAN GELOMBANG GESER (VS) DAN KETEBALAN SEDIMEN (H) DI KABUPATEN KLATEN DARI DATA MIKROTREMOR
No full textResearch on Shear Wave Velocity (vs) and Sediment Thickness (h) in Klaten Regency, Central Java from field microtremor data aims to determine the thickness of sediment or soft sediment as one of the factors of high and low earthquake vulnerability. Microtremor data was collected using a three-component TDS 303 seismometer, covering 111 measuring points in the Klaten Regency area. In this study, the sediment thickness was calculated using the equation shear wave velocity (vs) divided by four times the dominant frequency (fg). The dominant frequency (fg) value is obtained from the HVSR curve while the shear wave velocity value (vs) used in this study is the inversion value of the HVSR curve which is modeled based on borlog data at the Wedi Church, equated for all measurement points. On the map of the shear wave velocity distribution at each microtremor measuring point has a vs value, this value is used to calculate the thickness of the sediment at each point. So that the distribution of the thickness value of the sediment at each point is obtained, then a thickness map is made covering the study area. The results showed that in general the research area has a Vs value in the results of the HVSR curve inversion ranging from 130 m/s to 570.83 m/s, Vs average 275.68 m/s. The areas with vs are relatively high in the southern part of Gantiwarno, Wedi, and Bayat subdistricts that are directly adjacent to the hills of Gunung Kidul. Areas with relatively low value vs are in the area of Prambanan Subdistrict, Northern Wedi Subdistrict, Trucuk Subdistrict, Jogonalan Subdistrict, South Klaten District, Central Klaten District, and Kalikotes Subdistrict. For sediment thickness (h) ranges from 5,105 m to 113,648 m. Areas with relatively high sediment thickness are located in parts of Wedi Subdistrict with a thickness of up to 110 m. Areas with medium thickness (around 60 to 90 m) are in the area of Gantiwarno sub-district, Prambanan district, and the southern part of the Jogonalan sub-district. In the area of Bayat District it has a low thickness (about 5 to 30 m) located in the proves and mountains of the Paseban area and the tomb of Sunan Pandanaran. This shows that areas with high sediment thickness, namely in Wedi District, will also have a high level of earthquake vulnerability.Penelitian Ketebalan Sedimen (h) di Kabupaten Klaten, Jawa Tengah dari data mikrotremor lapangan bertujuan untuk mengetahui ketebalan sedimen atau endapan lunak sebagai salah satu faktor tinggi rendahnya kerentanan gempa. Pengambilan data mikrotremor dilakukan dengan seismometer tiga komponen TDS 303 yang meliputi 111 titik ukur yang berada di wilayah Kabupaten Klaten.Pada penelitian ini Ketebalan Sedimen dihitung dengan persamaan kecepatan gelombang geser (vs) dibagi empat kali frekuensi dominan (fg). Nilai frekuensi dominan (fg) didapatkan dari kurva HVSR sedangkan nilai kecepatan gelombang geser (vs) yang digunakan pada penelitian ini adalah digunakan nilai inversi kurva HVSR yang dimodelkan berdasarkan data borlog di Gereja Wedi, disamakan untuk semua titik pengukuran. Pada peta distribusi kecepatan gelombang geser disetiap titik ukur mikrotremor mempunyai nilai vs, nilai ini digunakan untuk perhitungan ketebalan sedimen di masing-masing titik. Sehingga di dapatkan distribusi nilai ketebalan sedimen di setiap titik kemudian di buat peta ketebalan meliputi daerah penelitian.Hasil penelitian menunjukkan bahwa secara umum daerah penelitian mempunyai ketebalan sedimen (h) berkisar antara 5,105 m sampai dengan 113,648 m.. Daerah dengan ketebalan sedimen relatif tinggi berada di sebagian wilayah Kecamatan Wedi dengan ketebalan mencapai 110 m. Daerah dengan ketebalan sedang (sekitar 60 sampai dengan 90 m) berada di wilayah Kecamatan Gantiwarno, Kecamatan Prambanan, dan bagian selatan Kecamatan Jogonalan. Di wilayah Kecamatan Bayat memiliki ketebalan rendah (sekitar 5 sampai dengan 30 m) terletak di perbuktian dan pegunungan daerah Paseban dan makam Sunan Pandanaran. Hal ini menunjukkan daerah dengan ketebalan sedimen tinggi yaitu di Kecamatan Wedi akan memiliki tingkat kerentanan gempa yang tinggi juga
Evaluasi Keretanan Bangunan Berdasarkan Metode Floor Spectral Ratio Dengan Perekaman Mikrotremor
No full textAbstrak
Yogyakarta merupakan daerah yang terletak di dekat pertemuan lempeng Eurasia dan Indo-Australia, sehingga berpotensi tinggi terhadap aktivitas tektonik yang dapat memicu gelombang seismik di permukaan tanah. Gelombang ini dapat membahayakan kestabilan bangunan yang ada di atasnya. Penelitian ini bertujuan untuk mengidentifikasi tingkat kerentanan struktur bangunan terhadap gempa bumi melalui analisis data mikrotremor yang merekam getaran alami bangunan. Studi dilakukan pada gedung Fakultas Teknik Sipil dan Perencanaan Universitas Islam Indonesia, dengan 46 titik perekaman di dalam bangunan dan 2 titik referensi di tanah. Data mikrotremor diolah menggunakan perangkat lunak Geopsy untuk memperoleh nilai frekuensi dominan dan amplitudo. Metode Floor Spectral Ratio (FSR) digunakan untuk menganalisis bangunan, sedangkan metode Horizontal to Vertical Spectral Ratio (HVSR) untuk analisis tanah. Hasil penelitian menunjukkan bahwa beberapa bagian bangunan memiliki frekuensi natural yang mendekati frekuensi tanah, meningkatkan potensi resonansi. Nilai indeks resonansi tergolong sedang hingga tinggi, sementara indeks kerentanan secara umum menunjukkan bahwa gedung berada pada tingkat risiko kerusakan yang rendah terhadap getaran gempa.
Kata kunci: Mikrotremor, FSR, HVSR, Frekuensi, Indeks Resonansi, Indeks Kerentanan
Abstract
Yogyakarta is located near the convergence of the Eurasian and Indo-Australian plates, making it highly vulnerable to tectonic activity that can generate seismic waves on the ground surface. These waves pose a threat to the stability of buildings. This study aims to assess the vulnerability level of building structures to earthquakes by analyzing microtremor data that records the building\u27s natural vibrations. The research was conducted on the Faculty of Civil Engineering and Planning building at Universitas Islam Indonesia, using 46 recording points inside the building and 2 reference points on the ground. Microtremor data were processed using Geopsy software to obtain dominant frequency and amplitude values. The Floor Spectral Ratio (FSR) method was used for building analysis, while the Horizontal to Vertical Spectral Ratio (HVSR) method was applied for ground analysis. The results show that several parts of the building have natural frequencies close to the ground frequency, increasing the potential for resonance. The resonance index values range from moderate to high, while the overall vulnerability index indicates a low risk of structural damage due to seismic vibrations.
Keywords: Microtremor, FSR, HVSR, Frequency, Resonance Index, Vulnerability IndexYogyakarta adalah daerah yang terletak berdekatan dengan lempeng Eurasia dan Hindia australia, hal ini menjadi salah satu ancaman jika sewaktu - waktu terjadi pergeseran lempeng tektonik sehingga menyebabkan terjadi perambatan gelombang seismik pada permukaan tanah. Perambatan gelombang pada permukaan tanah dapat menjadi ancaman terjadinya kerusakan pada bangunan. Oleh karena itu, dilakukah penelitian untuk mengetahui tingkat kerentanan bangunan berdasarkan perekaman data mikrotremor yang berasal dari getaran alami bangunan. Penelitian dilakukan pada gedung FTSP Universitas Islam Indonesia. Titik perekaman tersebar sebanyak 46 titik didalam gedung dan 2 titik perwakilan ditanah. Pengolahan data mikrotremor menggunakan sofware geopsy untuk mendapatkan nilai frekuensi bangunan, frekuensi tanah dan amplitudo. Metode Floor Spectral Ratio (FSR) merupakan metode yang digunakan untuk menganalisis data mikrotremor pada bangunan, sedangkan metode Horizontal to Vertical Spectral Ratio (HVSR) merupakan metode yang digunakan untuk menganalisis data mikrotremor pada tanah. Hasil penelitian menunjukkan bahwa beberapa bagian bangunan memiliki kerentanan yang signifikan terhadap gempa bumi. Frekuensi natural bangunan dibeberapa lantai mendekati frekuensi natural tanah, yang artinya meningkatkan risiko resonansi dan potensi kerusakan struktur. Nilai indeks resonansi pada beberapa titik pengukuran berada dalam klasifikasi sedang hingga tinggi, hal ini menunjukkan bahwa bagian - bagian tersebut lebih rentan mengalami kerusakan saat terjadi gempa bumi. Sedangkan nilai indeks kerentanan mengindikasikan bahwa gedung memiliki risiko kecil terhadap kerusakan akibat getaran gempa bumi
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
RASIO KEKAKUAN LENTUR (FLEXURAL STIFFNESS RATIO) ELEMEN BETON AKIBAT GEMPA BERDASARKAN ANALISIS DINAMIK STRUKTUR SINGLE DEGREE OF FREEDOM (SDOF)
No full textModeling the effective stiffness of reinforced concrete elements for structural analysis is an important problem and needs to be solved. The effective stiffness is then expressed in terms of the average flexural stiffness ratio Ck. whose value has been determined by Codes. Previous studies have shown that the stiffness ratio is assumed/stated to be strength-dependent. Based on this statement, research on the flexural stiffness ratio Ck of reinforced concrete elements through dynamic analysis of the SDOF structure was carried out. The SDOF structural model used has a vibration period T = 0.48 sec. The dynamic load used is 50 earthquake records consisting of 3-groups of frequency content (low, moderate, high). The dynamic analysis that was carried out has accommodated the inelastic responses whose behavior follows Modified Takeda hysteretic loops. The study results showed that the maximum response of the structure generally occurred in the strong middle part of the earthquake recording or the period of the effective duration of D595. The main finding in this study is that the strength dependent of flexural stiffness is proven. The relationship between the average flexural stiffness ratio Ck and peak ground acceleration of PGA can be mathematically expressed in the equation Ck = -0.981.PGA + 0.822. The relationship is negative, meaning that the higher the PGA value, the smaller the Ck value with a correlation coefficient of R = 0.635 (moderate correlation). The Ck value negatively correlates with the drift ratio and damage index, DI
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
