Judul: The Study of Lichens as Air Quality Bio-indicator in Two Different Locations
Abstrak: Lumut kerak merupakan organisme yang merespon baik adanya perubahan kualitas udara. Penelitian ini bertujuan mengkaji keanekaragaman dan respon lumut kerak di dua lokasi berbeda sebagai bioindikator kualitas udara. Penelitian ini menggunakan data primer dan data sekunder. Pengumpulan data primer dilakukan di Jalan Agatis, Kampus IPB Dramaga pada tanggal 20 Februari – 5 April 2020 dan 23 – 30 Juli 2020. Penelitian ini juga menggunakan hasil data dari penelitian sebelumnya di Jalan Rumah Sakit, Kota Bandung sebagai data pembanding. Data dianalisis menggunakan metode analisis deskriptif analitik. Nilai indeks keanekaragaman lumut kerak pada pohon mahoni di Jalan Agatis (1,83) lebih tinggi daripada di Jalan Rumah Sakit (1,25). Jumlah jenis lumut kerak yang ditemukan di Jalan Agatis sebanyak tujuh jenis dari lima famili, sedangkan di Jalan Rumah Sakit ditemukan lima jenis dari tiga famili. Jenis Dirinaria picta, Lepraria sp., Pyxine cocoes, dan Chrysothrix sp. dapat ditemukan di kedua lokasi. Lumut Kerak di kedua lokasi memiliki respon yang berbeda dalam hal warna, bentuk, keadaan, dan persentase tutupan lumut kerak., Lichen is an organism that responds well to air quality changes. The purpose of the research was to examine the diversity and response of lichens in two different locations as bio-indicator of air quality. This research was sourced on primary and secondary data. Primary data was conducted on Agatis Street, IPB University, on 20 February to 5 April 2020 and 23 to 30 July 2020. This research also used data results from previous research on Rumah Sakit Street, Bandung City as comparative data. The method used to analyze the data was descriptive-analytical. The value of lichens diversity index on mahogany trees on Agatis street (1,83) is higher than in Rumah Sakit street (1,25). The number of lichen's types found on Agatis street as many as seven types of five families, while on Rumah Sakit street found five types of three families. Dirinaria picta, Lepraria sp., Pyxine cocoes, and Chrysothrix sp. can be found in both locations. The lichens in both locations had different responses in terms of color, form, condition, and the percentage of lichens cover.
Keyword: air quality, diversity, substrate

Judul: Diversity of Lichens in Two Locations with Different Air Quality in South Jakarta
Abstrak: Lumut kerak merupakan salah satu bioindikator udara yang baik dan umum digunakan untuk memantau kualitas udara. Komposisi kimiawi dari lumut kerak dapat menggambarkan ketersediaan polutan di lingkungan. Tujuan Penelitian ini yaitu bertujuan mengkaji keanekaragaman jenis lumut kerak, komposisi jenis lumut kerak, serta respons lumut kerak pada dua lokasi dengan kualitas udara berbeda. Lokasi yang dipilih ditentukan dengan cara mengetahui karakteristik lingkungan meliputi suhu udara, kelembapan udara serta kualitas udara CO2 dan CO. Nilai keanekaragaman jenis lumut kerak di Tebet Eco Park (2,36) lebih tinggi daripada di TPS Rawajati Barat (1.71). Komposisi jenis lumut kerak yang ditemukan di Tebet Eco Park yaitu tiga belas jenis lumut kerak dari sembilan famili, sedangkan di TPS Rawajati Barat ditemukan enam jenis lumut kerak dari lima famili. Talus lumut kerak yang hidup di Tebet Eco Park menunjukkan respons talus berwarna lebih cerah, keadaan talus berkembang dengan baik dan tumbuh secara utuh satu kesatuan koloni serta luas tutupan talus yang lebih besar, sedangkan lumut kerak yang hidup di TPS Rawajati Barat menunjukkan respons talus berwarna lebih pudar dan kusam, keadaan talus berkembang tidak terlalu optimal, tumbuh secara terpecah-pecah tidak satu kesatuan koloni, serta luas tutupan talus yang lebih kecil., Lichens are one of the good bioindicators of air quality and commonly used for air quality monitoring. The chemical composition of lichens can depict the availability of pollutants in the environment. The aim of this study was to assess the diversity of lichen species, the composition of lichen species, and the responsse of lichens in two locations with different air quality. The selected locations were determined by considering environmental characteristics including air temperature, air humidity, and air quality in terms of CO2 and CO. The diversity index value of lichen species in Tebet Eco Park (2.36) was higher than that in TPS Rawajati Barat (1.71). The composition of lichen species found in Tebet Eco Park consisted of thirteen lichen species from nine families, while in TPS Rawajati Barat, six lichen species from five families were found. The lichen thallus living in Tebet Eco Park showed a brighter color responsse, well-developed thallus condition with intact colony units, and a larger thallus coverage area. On the other hand, the lichen thallus living in TPS Rawajati Barat exhibited a paler and duller color responsse, less optimal thallus development with fragmented and non-unified colony units, and a smaller thallus coverage area.
Keyword: ir quality, bioindicator,, lichen

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
Keyword: