Judul: The Effect of Rainfall and Forest and Land Fires in East Tanjung Jabung Regency, Jambi Province
Abstrak: Kabupaten Tanjung Jabung Timur merupakan salah satu kabupaten paling timur dari Provinsi Jambi dengan luasan lahan gambut terluas di Provinsi Jambi. Penelitian bertujuan untuk mengetahui pengaruh curah hujan dan kaitannya dengan hotspot sebagai indikator terjadinya kebakaran hutan dan lahan gambut di Kabupaten Tanjung Jabung Timur, Provinsi Jambi. Data yang digunakan dalam penelitian ini bersumber dari NASA FIRMS untuk hotspot dan NASA POWER untuk curah hujan yang dianalisis secara deskriptif dan korelasi. Hasil penelitian menunjukkan jumlah hotspot tahunan dari tahun 2018 – 2022 sebanyak 1696 titik dengan 1075 titik berada pada lahan gambut dan 621 lainnya pada lahan mineral. Peningkatan terjadi di tahun 2019 sebanyak 1636 titik disebabkan kejadian kebakaran yang menjangkau 5151,02 ha. Hasil analisis korelasi menunjukkan curah hujan dengan hotspot tidak memiliki korelasi yang signifikan dengan koefisien korelasi negatif kuat sehingga peningkatan hotspot diikuti dengan penuruan curah hujan, dan sebaliknya., East Tanjung Jabung Regency is one of the easternmost districts of Jambi Province and has the largest peatland area in Jambi Province. The research aims to determine the effect of rainfall and its relation to hotspots as an indicator of forest and peatland fires in East Tanjung Jabung Regency, Jambi Province. The data used in this study were sourced from NASA FIRMS for hotspots and NASA POWER for rainfall, which were analyzed descriptively and correlationally. The results of the study show that the number of annual hotspots from 2018 to 2022 is 1696, with 1075 points on peatlands and 621 others on mineral lands. The increase occurred in 2019 by 1636 points due to fire incidents that covered 5,151.02 ha. The results of the correlation analysis show that rainfall with hotspots does not have a significant correlation with a strong negative correlation coefficient, so an increase in hotspots is followed by a decrease in rainfall, and vice versa.
Keyword: Curah Hujan, hotspot, Kabupaten Tanjung Jabung Timur, Kebakaran Hutan dan Lahan

Judul: Analysis of Humidity, Air Temperature and Rainfall on Peat Fire Case in Jambi
Abstrak: Kabupaten Tanjung Jabung Timur Jambi memiliki permasalahan serius pada kebakaran lahan gambut. Pengaruh kelembapan, suhu udara dan curah hujan seringkali dikaitkan dengan pengaruh iklim yang memberikan kondisi ideal untuk terjadinya kebakaran. Informasi hotspot yang didapatkan dari penginderaan jauh melalui satelit Terra dan Aqua MODIS dapat digunakan untuk mengetahui jumlah hotspot dan peluang terjadinya kebakaran. Tujuan penelitian ini adalah untuk menganalisis hubungan antara kelembapan, suhu udara dan curah hujan terhadap kejadian kebakaran hutan dan gambut di Kabupaten Tanjung Jabung Timur Jambi pada tahun 2017-2019. Hasil penelitian menunjukkan bahwa analisis korelasi kelembapan, suhu udara, curah hujan terhadap hotspot di Kabupaten Tanjung Jabung Timur dalam kurun waktu 2017-2019 memperlihatkan bahwa ketiganya memberikan sumbangan pengaruh terhadap jumlah hotspot. Kelembapan merupakan variabel dengan nilai korelasi tertinggi, sebesar -0,569. Penurunan kelembapan udara yang diikuti oleh penurunan curah hujan disertai terjadinya peningkatan suhu udara mulai bulan Juni sampai bulan September 2019 menyebabkan terjadinya peningkatan hotspot tertinggi pada bulan September 2019 yang menyebabkan terjadi peningkatan kejadian kebakaran di Tanjung Jabung Timur, Jambi., Tanjung Jabung Timur Jambi has a serious problem with peatlands fires. The effects of humidity, air temperature and rainfall are often associated with climatic influences that provide ideal conditions for fire to occur. Hotspot information obtained from remote sensing through the Terra and Aqua MODIS satellites can be used to determine the number of hotspot and the chance of fire occurrences. The research objective was to analyze the relationship between air humidity, air temperature and rainfall to the forest fires in Tanjung Jabung Timur Regency, Jambi during 2017-2019. The results showed that analysis of correlation between air humidity, air temperature, and rainfall on hotspot occurrences at Tanjung Jabung Timur shows that all three variables contributed to the number of hotspot. Humidity was the variable with highest correlation of -0,569. The decrease of humidity that followed by a decrease in rainfall and an increase in air temperature from June to September 2019 led to the highest hotspot in September 2019, which resulted to an increase of forest fire occurrences in Tanjung Jabung Timur, Jambi.
Keyword: Fire, Humidity, Peatlands, Rainfall, Temperature

Judul: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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