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All Journal POSITRON GRADIEN INDONESIAN JOURNAL OF APPLIED PHYSICS Spektra: Jurnal Fisika dan Aplikasinya Jurnal Pengelolaan Laboratorium Pendidikan PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Newton-Maxwell Journal of Physics Indonesian Journal of Community Empowerment and Service

Lizalidiawati Lizalidiawati

Jurusan Fisika, FMIPA, Universitas Bengkulu Jl. WR. Supratman Kandang Limun, Bengkulu, 38371

Author-ID : 308452

Aerospace Engineering Humanities Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

Published : 11 Documents Claim Missing Document

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Karakterisasi Keramik Aluminium Borat Menggunakan Metode Analisis Struktur Fasa Dan Densitas Irkhos, Irkhos; Lizalidiawati, Lizalidiawati
GRADIEN : Jurnal Ilmiah MIPA Vol 4, No 1 (2008): (Januari 2008)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (229.681 KB)

Telah dilakukan karakterisasi keramik aluminium borat menggunakan metode analisis struktur fasa dan densitas. Hasil yang diperoleh untuk masing-masing metode menunjukkan bahwa keramik aluminium borat memiliki komposisi 78% mol Al2O3 : 22% mol B2O3 yang merupakan komposisi nonstoikometris.Â Â Â

Rancang-bangun alat penentuan kecepatan bunyi di udara berbasis instrumentasi Lubis, Ashar Muda; Lizalidiawati, Lizalidiawati
GRADIEN : Jurnal Ilmiah MIPA Vol 1, No 1 (2005): (Januari 2005)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (225.45 KB)

Tujuan dari penelitian ini adalah untuk menentukan kecepatan bunyi diudara. Dengan desain alat yangtelah dibuat didapatkan hubungan panjang gelombang bunyi linear terhadap perioda gelombang denganpersamaan : ? = 340,22T + 0,0004 dengan koefisien korelasi sebesar 0,99. Ini menunjukkan hubungan yang kuatantara kedua variable tersebut. Kecepatan bunyi diudara pda suhu ruang diperoleh sebesar 340,33 Â± 1,9185 m/suntuk 12 kali variasi frekuensi sumber bunyi yang diberikan (1- 12 kHz). Hasil ini menunjukkan ketelitian yangtinggi dengan tingkat error 0,56%.

Sebaran Arus Permukaan Laut Pada Periode Terjadinya Fenomena Penjalaran Gelombang Kelvin Di Perairan Bengkulu Lestari, Widya Novia; Lizalidiawati, Lizalidiawati; Suwarsono, Suwarsono; Ekawita, Riska
GRADIEN : Jurnal Ilmiah MIPA Vol 11, No 2 (2015): (Juli 2015)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (276.795 KB)

Penelitian Arus laut adalah pergerakan massa air laut yang menyebabkan perpindahan horizontal dan vertikal massa air laut secara terus menerus. Pergerakan arus permukaan laut disebabkan oleh angin sebagai gaya pembangkit utama arus permukaan. Angin di Indonesia didominasi oleh angin monsun yang membawa pengaruh besar terhadap pergerakan arus dan gelombang. Angin Monsun terdiri dari angin monsun barat laut (Desember-Februari) dan angin monsun tenggara (Juni-Agustus). Daerah penelitian ini berada di perairan Bengkulu yang bertujuan untuk mengetahui sebaran arus permukaan laut pada periode terjadinya penjalaran gelombang Kelvin (April-Mei) dan Oktober-November) dan mengetahui seberapa besar pengaruh kecepatan angin terhadap pembangkitan arus permukaan di perairan Bengkulu. Penelitian dilakukan dengan pengolahan data sekunder berupa arus permukaan, dan suhu permukaan laut yang mewakili musim dan data kecepatan angin diolah dengan bantuan program yang dijalankan dengan software Matlab. Data kecepatan angin berasal dari National Center For Environmental Prediction (NCEP-Reanalysis NOAA), data arus permukaan dan suhu permukaan laut berupa hasil luaran prediksi model global HYCOM-NCODA. Hasil pengolahan menunjukkan besarnya kecepatan angin pada musim peralihan I (Maret-Mei) dan 2 (Oktober) terlihat kuat dan arahnya tidak menentu. Analisis yang didapatkan kecepatan angin, sebaran arus permukaan dan suhu permukaan laut di perairan Bengkulu berpengaruh besar terhadap fenomena penjalaran gelombang Kelvin pada musim peralihan I dan II.

Struktur Bawah Permukaan pada Lokasi Rencana Pembangunan Rumah Sakit Muhammadiyah Kota Bengkulu dengan Metode seismik MASW Secara 2 Dimensi Lubis, Ashar Muda; Satriani, Bella; Lizalidiawati, Lizalidiawati; Samdara, Rida
POSITRON Vol 10, No 1 (2020): Vol. 10 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

A study on the subsurface structure has been conducted using the multichannel analysis of surface wave (MASW) method near Tugu Hiu, Bengkulu City, the location where Muhammadiyah hospital will be built. We aimed to determine the subsurface structure in 2-Dimension (2D) to classify soil type on the location. The data were measured with seismograph PASI 16S24-P using 24 geophones for a track of 72 m of total length and 1.5 m of intervals. The seismic data were processed by using seismic ParkSeis software. The results show that shear wave velocity (Vs) is 800-1200 m/s at a depth of 1-5 m, indicating this layer is filled by rock type (unsaturated). At a depth of 6-8 m below surface, Vs value decreases to 400-500 m/s which may indicate that the soft rock type fills the layer. The results of this study provide a high level of confidence, about 80-100%, in the Vs value. Thus, we suggest for the foundation of hospital construction, the pillars for construction must be for more than 10 m in depth with a solid concrete foundation. This to ensure the foundation can withstand the building in case of shake during an earthquake.

Interpretasi Tingkat Kekerasan Batuan Bawah Permukaan di Daerah Rawan Gempa Bumi Kota Bengkulu Arif Ismul Hadi; Refrizon Refrizon; Halauddin Halauddin; Liza Lidiawati; Paisal Edo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): IJAP Volume 11 ISSUE 01 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.46525

Bengkulu City is located in the subduction zone of the Indo-Australian and Eurasian plates, so it is prone to earthquake. To anticipate the impact of earthquake, disaster mitigation can be carried out, one of which is a study of the level of rock hardness in the area. This study aims to determine the level of rock hardness based on seismic wave velocity in several rock formations and to determine which rock formations have the potential to cause vulnerability to earthquakes. Field data acquisition uses the seismic refraction method with time-term inversion technique. The data obtained in the field are processed to obtain a 2-D cross-section of the subsurface seismic wave velocity values. The study results show that the level of rock hardness depends on the type of rock formation. The Andesite Rock Formation Unit (Tpan) has the highest level of hardness, while the transitional area between the Alluvium Rock Formation Unit (Qa) and the Swamp Sedimentary Rock Formation Unit (Qs) has the lowest level of hardness.

IDENTIFIKASI WILAYAH UPWELLING BERDASARKAN VORTISITAS DAN DIVERGENSI DI PERAIRAN SELATAN JAWA HINGGA NUSA TENGGARA BARAT Lizalidiawati Lizalidiawati
Spektra: Jurnal Fisika dan Aplikasinya Vol 1 No 1 (2016): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 1 Nomor 1, Agustus 2016
Publisher : Program Studi Fisika Universitas Negeri Jakarta

Abstrak Salah satu perairan di Indonesia yang telah teridentifikasi sebagai lokasi upwelling adalah perairan selatan Jawa hingga Nusa Tenggara Barat. Identifikasi daerah upwelling berdasarkan hasil model HAMSOM Baroklinik 3D menunjukkan bahwa upwelling paling kuat terjadi di perairan selatan Jawa Timur pada saat musim timur. Hasil model menunjukkan bahwa Arlindo yang melalui Selat Lombok berperan terhadap penguatan arus ke arah barat (arus zonal) di lepas pantai selatan Jawa Timur. Penguatan arus ke arah barat di lepas pantai menyebabkan kecepatan geser (shear velocity) ke arah pantai selatan Jawa Timur. Kecepatan geser ke arah pantai menimbulkan vortisitas negatif dan terjadinya zona divergensi sehingga mengakibatkan kekosongan massa air di permukaan yang dapat meningkatkan intensitas upwelling di pantai selatan Jawa Timur. Transpor Arlindo maksimum terjadi pada bulan Agustus sebesar 1,30 Sv. Analisis statistik menunjukkan bahwa transpor Arlindo memiliki korelasi yang kuat terhadap arus zonal di perairan selatan Jawa Timur dengan koefisien korelasi sebesar 0,78. Vortisitas maksimum terdapat pada bulan Agustus sebesar -8,82 x 10-6 s-1 dan divergensi horizontal sebesar +3,60 x 10-6 s-1. Kata-kata kunci: Arlindo, arus zonal, kecepatan geser, vortisitas, divergensi. Abstract One of the Indonesia waters that have been identified as the location of upwelling are southern waters of Java to West Nusa Tenggara. Identification of upwelling area based on the simulation results of the HAMburg Shelf Ocean Model (HAMSOM) 3D Baroclinic showed that a stronger intensity in the southern waters of East Java in the shoutheast monsoon. The results showed that the ITF through the Lombok Strait contributes to the strengthening of the westward flow (zonal flow) off the south coast of East Java. The Strengthening of westward flows off the coast caused a shear velocity towards the southern coast of East Java. Shear velocity towards onshore caused negative vorticity and occurred the horizontally divergence zone which resulted vacancy of water masses in the surface so as to increase the intensity of upwelling. The maximum ITF was occurred in August with value 1.30 Sv and which caused westward flows to be stronger. The statistical analysis showed that the ITF transport has a strong correlation with the zonal currents in the southern waters of East Java with a correlation coefficient 0.78. The maximum vorticity was found in August with value -8.82 x 10-6 s-1 and the maximum horizontally divergence +3.60 x 10-6 s-1. Keywords: ITF, zonal flow, shear velocity, vorticity, divergence.

DESAIN SISTEM KALIBRATOR DAN DETEKTOR PERGERAKAN TANAH DI LAHAN MIRING Riska Ekawita; Elfi Yuliza; Lizalidiawati Lizalidiawati
PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) Vol 6 (2017): PROSIDING SEMINAR NASIONAL FISIKA (E-JOURNAL) SNF2017
Publisher : Program Studi Pendidikan Fisika dan Program Studi Fisika Universitas Negeri Jakarta, LPPM Universitas Negeri Jakarta, HFI Jakarta, HFI

Abstrak Pengamatan pergerakan tanah menggunakan sistem sensor merupakan upaya efektif yang dapat dilakukan dalam mengurangi resiko bencana longsor. Pada penelitian ini dikembangkan sistem detektor pergerakan tanah menggunakan sensor accelerometer. Untuk mengurangi kesalahan pembacan sensor, dilakukan perancangan sistem kalibrator. Secara umum, sistem kalibrator terdiri dari motor dan driver motor yang bergerak secara diskrit. Detektor kemiringan menggunakan sensor accelerometer 3 axis dan mikrokontroler. Karakteristik kalibrator yang dikembangkan mampu menguji sensor dalam dalam dua axis, sehingga untuk sensor 3 axis dapat dilakukan secara manual. Berdasarkan hasil uji kalibrasi dan uji performa sensor pada model fisis skala laboratorium, sistem sensor telah menunjukan hasil yang baik dan sesuai digunakan untuk sistem pengamatan pergerakan tanah. Sensor accelerometer memiliki resolusi hingga 0,386 o/step sehingga setiap perubahan kecil yang terjadi dapat terdeteksi dengan baik pada sensor Kata-kata kunci: accelerometer; kalibrasi; kemiringan; mikrokontroler. Abstract Observation of soil movement using sensor system is an effective effort that can be done in reducing the risk of landslide disaster. In this research, it has been developed soil movement detector system using accelerometer sensor. The calibrator system is designed to reduce the error sensor. Generally, calibrator system consists of motor and driver motor that move discretely. The inclined plane detector used 3 axis accelerometer and microcontroller. The developed calibrator characteristics are capable of testing the sensors within two axis, so for 3 axis sensors can be done manually. Based on the results of calibration and sensor performance test on the laboratory scale physical model, the sensor system has shown good result and suitable to be used for observation system of the soil movement on inclined plane. The accelerometer sensor has a resolution of up to 0.386 o/step so that any minor changes that occur can be detected properly on the sensor. Keywords: accelerometer; calibration; inclined plane; microcontroller.

Kajian Kualitas Air dan Indeks Pencemaran Di Perairan Kampung Sejahtera Pulau Baai Kota Bengkulu Yulisah Dwi Putri; Elfi Yuliza; Lizalidiawati Lizalidiawati
Newton-Maxwell Journal of Physics Vol. 2 No. 2: Oktober 2021
Publisher : UNIB Press

Water quality is one of the important factors supporting the growth of mangrove ecosystems. The activites of Kampung Sejahtera’s people were allegedly polluted the waters and disturbing the mangrove ecosystem. This study aimed to identify the status of water quality and pollution index in the waters of Kampung Sejahtera, Bengkulu City. The method used is a direct measurement at the research location which was carried out at 9 location points, 5 points representing the waters near the settlements of the prosperous village residents, and 4 location points representing the waters near the mangrove ecosystem. Then the results are compared with the Decree of the State Minister of the Environment No. 51 of 2004 concerning seawater quality standards for marine biota and to determine the status of water quality by using the pollution index method based on the Decree of the State Minister of the Environment No. 115 of 2003. The results of this study indicate that the temperature parameter, salinity, and pH met the quality standard while the TSS and DO parameters did not fulfill the quality standard. Based on the results of the calculation of the pollution index that the waters of Kampung Sejahtera are in the category of good condition to lightly pollute.

Pemetaan Sebaran Indeks Pencemaran Air di Perairan Muara Sungai Jenggalu Kota Bengkulu Vedina Delima Purba; Liza Lidiawati; Nanang Sugianto
Newton-Maxwell Journal of Physics Vol. 2 No. 2: Oktober 2021
Publisher : UNIB Press

Muara Sungai Jenggalu merupakan salah satu muara sungai di Kota Bengkulu yang mengalami pencemaran. Penelitian ini mengidentifikasi kadar kualitas air dan indeks pencemaran di Muara Sungai Jenggalu berdasarkan parameter fisika dan kimia. Data penelitian diperoleh berdasarkan pengukuran secara langsung, analisis laboratorium dan perhitungan indeks pencemaran. Pengukuran dilakukan pada 9 titik yang tersebar di Muara Sungai Jenggalu. Data hasil penelitian ini dibandingkan dengan baku mutu PP 82 tahun 2001 tentang pengelolaan kualitas air dan pengendalian pencemaran. Kemudian perhitungan nilai indeks pencemaran untuk mengetahui indikasi pencemaran pada Muara Sungai Jenggalu berdasarkan Kepmen LH Nomor 115 Tahun 2003. Hasil pengukuran kadar salinitas tertinggi sebesar 26,8‰ dan terendah 12,8‰, kadar DO tertinggi sebesar 6,3 mg/l dan terendah sebesar 5 mg/l, kekeruhan tertinggi 5,4 NTU dan terendah sebesar 0,9 NTU, Kadar TDS tertinggi sebesar 872 mg/l dan terendah sebesar 743 mg/l, kadar pH tertinggi sebesar 7,5 dan terendah 7,2 dan suhu tertinggi sebesar 30,7°C dan terendah sebesar 29,1°C. Selain itu nilai kecepatan arus tertinggi sebesar 0.25 m/s dititik 2 dan terendah sebesar 0,1 m/s dititik 7dan titik 8 dan debit air sebesar 139,8 m³/s. Hasil dari penelitian ini menunjukkan nilai indeks pencemaran di Muara Sungai Jenggalu sebesar 1,28 dengan kondisi tercemar ringan.

Rancang Bangun Data Logger Suhu dan Kecepatan Arus Laut Untuk Praktikum Oseanografi S Suwardi; Liza Lidiawati; Erik Ayatullah
Jurnal Pengelolaan Laboratorium Pendidikan Vol. 4, No. 2, Juli 2022
Publisher : UPT Laboratorium Terpadu, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jplp.4.2.57-65

The equipment of experiment and research of oceanography at the Physics Laboratory of the Faculty of Mathematics and Natural Sciences, Bengkulu University are still very limited of type. One of the oceanography equipment is a current meter to measure the temperature and speed of ocean currents. This equipment has limited data recording which is still manual so that it is prone to human error in its measurement. In an effort to overcome the limitations of the current meter above, in this study a temperature and ocean current velocity data logger was developed. This study aims to develop a data logger and test its effectiveness which was carried out in July – November 2021 with four stages. The first stage is design, including hardware design and software design. The second stage is the manufacturing stage, namely the manufacture of data logger hardware following the system block diagram and software development using Arduino software following the system flow diagram. The third stage is the testing stage, which includes the process of testing system performance, calibration and field testing. The fourth stage is evaluation, namely evaluation of system performance, accuracy of measurement results, and refinement of data loggers. Comparative test of the results of temperature measurements using a data logger and current meter experienced a difference between 0.1 - 0.8 oC. While the current velocity measurement using a data logger and current meter shows a difference between 0.3 – 1 m/s. The data logger has been successfully developed and works well, but its accuracy still needs to be improved by replacing the water velocity sensor with a higher sensitivity.

Co-Authors Arif Ismul Hadi Ashar Muda Lubis Elfi Yuliza Elfi Yuliza Erik Ayatullah Halauddin Halauddin Irkhos Irkhos Irkhos Lestari, Widya Novia Nanang Sugianto Paisal Edo Refrizon Refrizon Rida Samdara Riska Ekawita S Suwardi Satriani, Bella Suwarsono Suwarsono Vedina Delima Purba Yulisah Dwi Putri

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