Judul: Diversity of lichens’ three city parks at south jakarta as bioindicators of air pollution
Abstrak: Lumut kerak merupakan organisme yang dapat mengabsorpsi polutan udara namun tidak mampu mengembalikannya kembali ke lingkungan sekitarnya, sehingga polutan udara terakumulasi dan merubah fisiologisnya. Kondisi tersebut menjadikan lumut kerak dapat dijadikan sebagai bioindikator pencemaran udara. Tujuan penelitian ini yaitu untuk mengukur keanekaragaman lumut kerak dan melihat hubungannya dengan karakteristik lingkungan (suhu, kelembapan, SO2, NO2 dan TSP) di tiga taman kota di Jakarta Selatan. Penelitian dilaksanakan pada bulan Maret hingga April 2014. Taman Kota Martha Tiahahu mewakili peruntukan pusat kegiatan sosial ekonomi. Taman Kota Ayodya mewakili peruntukan rekreasi, dan Taman Kota Gandaria Tengah mewakili peruntukan pemukiman. Hasil penelitian menunjukkan bahwa nilai indeks keanekaragaman lumut kerak ketiga taman kota berturut-turut semakin rendah yaitu Martha Tiahahu (1.23), Gandaria Tengah (1.17) dan Ayodya (0.57). Dominasi pohon dengan keliling batang yang besar di Martha Tiahahu diduga menjadi faktor utama tingginya nilai indeks keanekaragaman di taman tersebut. Dari lima karakteristik lingkungan, hanya kelembapan yang memiliki hubungan linier (berbanding lurus) terhadap keanekaragaman lumut kerak., Lichen is an organism that afford to absorb air pollutants but can’t return it back into the surrounding environment, so the air pollutants accumulate and affect physiology. Those conditions make lichens can be used as bioindicators of air pollution. This study’s purpose is to measure the diversity of lichens and see its relationship with environmental characteristics (temperature, humidity, SO2, NO2 and TSP) in three city parks at South Jakarta. The study was conducted in March to April 2014. Martha Tiahahu City Park represents the center of socio-economic activity. Ayodya City Park represents recreation and Gandaria Tengah City Park represents residential designation. The result showed that the value of lichens’ diversity index from the highest value is Martha Tiahahu (1.23), Gandaria Tengah (1.17) and Ayodya (0.57). The large trees dominance at Martha Tiahahu is the major factor of the high value in city park’s diversity index. Moisture is the only one of environment’s character that has a linear relationship (proportional) to the lichens’ diversity.
Keyword: keanekaragaman, kualitas udara, lumut kerak

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: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
Keyword: