Mathematics is still viewed as a culture-free subject. This forms a negative perception for students on mathematics. Most students assume that mathematics and culture are not related. This may occur because mathematics taught in school is not contextual and far from the reality of everyday life. Historically, mathematics has become a part of everyday life. As a maritime nation, Indonesia has a diverse culture. But many teachers are not yet aware of the integration of the culture into mathematics learning. Barongko cake is one of the Buginese cultural heritages. Buginese people have unconsciously been practicing mathematics in making these cakes. Therefore, this research aims to explore activities in making Barongko cakes in the Buginese community that involves mathematical concepts. This research is a qualitative descriptive with an ethnographic approach. The data collection methods are carried out through observation, documentation, interview with an expert in making Barongko cake. This research found that Barongko making process involves mathematics in the concept of division, congruence, and similarity, as well as a triangular prism, and half sphere. This cake has the potential to be used as a source of contextual mathematics learning in schools.

The phenomenon of code switching nowadays is very often encountered in both direct and indirect communication or on social media. This research aims to describe the forms and the factors of using code switching that using in on  Instagram. After doing the analysis researcher consider there are three kinds of form code switching that found on instagram account using by instagram users they are: tag-switching, intersentential code switching, and intrasetential code switching. Then after doing the analysis based on of the types, researcher founds the reasons of using code switching there are four points: changing topic, lack of vocabulary, bilingual/multilingual, Prestige and trend. This research using sociolinguistic study because it’s related to the topic in this research. Then the researcher used qualitative research methods in doing the analysis. This research are expected to be useful in the process of learning language, especially studies of sociolinguistic and the using of language.

Abstract:Soil quality plays pivotal role in increasing productivity and brackish water ponds successfulness, including ponds of Java Island, Indonesia. However, the availability of data on concentration categories for soil quality variables for ponds soils in Java Island, which is volcanic-dominated soils and the largest area for ponds in Indonesia, is still scarce. This study was aimed to categories soil quality variable concentrations as an initial point in interpreting pond soils quality of Java Island. Soil samples were collected from two different soil depths of 923 sampling points representing 13 regencies/cities of West Java, Central Java, and East Java Provinces. Twenty soil quality variables were measured based on in-situ and ex-situ measurements. The t-Student and U-Mann Whitney tests were applied to analyses the differences in soils quality at each soil depth which were firstly analyzed using z-score to eliminate outlier data. The data were firstly rearranged from the smallest to the largest data prior to measuring data deciles; the deciles, as considered as the basic measurement, were used for categorizing each soil quality variable. The results of this study indicated that the pH and nutrients are higher at pond top soils, 0-0.2 m compared to that observed on the depth of 0.2-0.5 m. Concentration of soil quality variables such as S KCl , S P , S POS , TPA, TAA, TSA, and pyrite relatively similar between the two depths. Data of each soil quality variable were categorized into very low, low, moderate, high, and very high to facilitate a comparison to other data of ponds soil qualities. The results of this study are not recommended for assessing the relationship between ponds soil quality and ponds productivity; yet are usefull in measuring which variable of ponds soil quality is categorized as very low, low, moderate, high or very high; and also useful in making decision on pond soils quality management in Java Island.

Penelitian ini bertujuan untuk menghasilkan produk panduan praktikum kimia dasar terintegrasi etnokimia. Penelitian pengembangan dilakukan dalam tiga tahap, yaitu: 1) menganalisis materi (define), 2) mendesain prototype panduan (design), 3) validasi dan uji coba produk (develop). Validasi dilakukan oleh ahli materi dan ahli media. Uji coba dilakukan terhadap 17 mahasiswa untuk mengetahui respon dan keterampilan kerja ilmiah mahasiswa menggunakan panduan praktikum. Berdasarkan analisis data dapat diambil kesimpulan bahwa produk panduan praktikum dinyatakan valid oleh ahli materi (rerata 75%) dan ahli media (rerata 86,25%). Panduan dinyatakan layak digunakan, karena menunjukkan respon positif dan capaian keterampilan kinerja ilmiah mahasiwa yang sangat baik. Kata kunci: pengembangan, panduan, praktikum, kimia dasar, etnokimia.

Harmful Algal Blooms (HABs) dapat memberikan dampak negatif secara ekologis, ekonomis dan kesehatan.  Kejadian dapat bervariasi menurut faktor lingkungan lokal pemicu serta kemampuan adaptasi spesies.  Penelitian ini bertujuan untuk mengetahui keterkaitan antara karakteristik kualitas lingkungan dengan keberadaan fitoplankton berpotensi HABs pada tambak ekstensif di Kecamatan Losari Kabupaten Cirebon, Jawa Barat.  Sebanyak masing-masing 45 contoh air dan tanah diambil pada total luas petakan tambak ±2300 ha dengan metode transek yang dimodifikasi. Peubah kualitas air yang diukur meliputi; Total Amonia Nitrogen (TAN), Nitrit (NO2-N), Nitrat (NO3-N), Fosfat (PO4-P), Bahan Organik Total (BOT) dan Plankton.  Sedangkan peubah kualitas tanah tambak meliputi pH, total nitrogen (NTOT), fosfat (PO4-P) dan BOT. Analisis keterkaitan kualitas lingkungan dengan keberadaan fitoplankton berpotensi HABs dilakukan dengan BIO-ENV analysis, Cluster analysis, dan analisis spasial dengan software PRIMER 5.0 dan ArcGIS 10.0.  Dari  23 spesies yang diidentifikasi terdapat 5 spesies (21%) yang potensial sebagai HABs meliputi Prorocentrum sp, Ceratium sp, Gymnodinium sp, Thalassiosira sp dan Nitzchia sp.   Prorocentrum sp ditemukan pada 21 stasiun  dari total 45 stasiun dengan kepadatan tertinggi (508 ind/L). Hasil analisis selanjutnya menunjukkan bahwa distribusi spasial spesies berkaitan erat dengan distribusi nilai TAN dan BOT air serta nilai N-Total tanah. Jika tidak ada upaya pengelolaan dan mitigasi sehubungan keberadaan HABs tersebut maka dikhawatirkan dapat mempengaruhi produktivitas dan keberlanjutan kegiatan budidaya di lokasi penelitian.Harmful Algal Blooms (HABs) can cause serious negative ecological, economical and human health impacts. The occurrence of HABs may vary according to local environmental factors and the adaptability level of the causative species. This study aims to determine the relationship between environmental quality and the presence of causative phytoplankton species of HABs at extensive brackishwater aquaculture ponds located in Losari District, Cirebon Regency, and West Java Province. The sampling method followed a modified transect method by which a total of 45 each water and soil samples were taken from pond units, covering the total area of about 2300 ha. Water quality parameters comprised total ammonia nitrogen (TAN), nitrite, nitrate, phosphate and total organic matter (TOM). Whilst the pond soil quality variables included pH, total nitrogen (NTOT), phosphate and TOM. Spatial relationship between environmental quality and the presence of potentially causative phytoplankton species of HABs conducted through BIO-ENV analysis, cluster analysis and spatial analysis with the help of software PRIMER 5.0 and ArcGIS 10. Of the total 23 identified phytoplankton species, 5 species (21%) were classified as potentially causative sepecies of HABs including Prorocentrum sp, Ceratium sp, Gymnodinium sp, Thalassiosira sp and Nitzchia sp.  Prorocentrum sp was discovered in 21 stations of a total of 45 stations and accounted for the highest density (508 ind. / L). The results further indicated that the spatial distribution of the causative species is closely related to the distribution of values of TAN and TOM (water) and NTOT (soil).  Unless effective management and mitigation efforts are undertaken, the presence of the potentially causative species could affect the sustainability of aquaculture activities at the study sites.

ABSTRAKDi Indonesia, silvofishery diharapkan dapat menjadi salah satu alternatif terbaik untuk mencapai pengelolaan ekosistem mangrove dan tambak ekstensif secara optimal dan berkelanjutan. Penelitian ini bertujuan untuk mengevaluasi status kelayakan rekayasa tambak silvofishery di Desa Jayamukti Kecamatan Blanakan Kabupaten Subang Provinsi Jawa Barat. Evaluasi dilakukan dengan menerapkan metode survai tingkat detail yang berbasis sistem informasi geografis (SIG) dan memanfaatkan citra satelit worldview-2. Survai lapang meliputi pengambilan contoh tanah, pengukuran elevasi lahan tambak, pengukuran pasang surut, dan pengukuran kualitas air secara insitu. Hasil kajian ini menunjukkan bahwa kondisi rekayasa tambak eksisting dapat berpengaruh langsung maupun tidak langsung pada produktivitas dan keberlanjutan tambak silvofishery di lokasi studi. Ketidaksesuaian lebar dan kedalaman saluran dengan kondisi tunggang pasut lokal (< 1 m) menyebabkan tidak efektifnya fungsi saluran dalam menyediakan kuantitas dan kualitas air yang optimal untuk kegiatan budidaya. Selanjutnya penelitian ini juga menemukan ketinggian pematang primer dan sekunder eksisting umumnya lebih rendah dibandingkan ketinggian pematang ideal dengan selisih rata-rata masing-masing -0,68 m hingga -0,56 m. Nilai salinitas air dengan kisaran 7-65 ppt juga merupakan faktor pembatas utama produktivitas lahan. Nilai salinitas air tambak yang tinggi berkaitan erat dengan variasi spasial elevasi dasar tambak dan penurunan efektivitas fungsi saluran tambak akibat sedimentasi. Jika faktor pembatas lingkungan dan ketidaksesuaian rekayasa tambak tersebut tidak ditangani dengan baik tentunya akan mengancam keberlanjutan kegiatan budidaya berbasis silvofishery di lokasi penelitian.KATA KUNCI: silvofishery, rekayasa tambak, kualitas lingkungan, SIG, Kabupaten Subang ABSTRACT:The

The need for clean water is very important for humans because it is one of the benchmarks of successful development in an area. Where every area, especially Uma Sima Urban Village, Sumbawa Sub-district will experience an increase in population every year so that the need for clean water will increase. The purpose of this study is to determine the need for clean water and the distribution system of clean water pipelines in Uma Sima Urban Village for the next 20 years until 2037 by using the method of analyzing clean water needs with projected population numbers using the exponential regression formula and network simulations pipeline distribution with Epanet 2.0 software. Based on the results of the analysis carried out, it can be obtained the need for clean water at peak hours of 16.99 liters / second with a max day factor of 1.15 and 18,446 liters / second with a max of 1.25 days factor. Whereas for the distribution network simulation it was found that the distribution network is still effective for carrying water for the next 20 years, namely in 2037.

This article aims to find indicators of argumentation contained in the Mata Najwa talk show using pragmadialectical studies. The data used in this study was from a debate speech at the Mata Najwa event on the topic "Beres-Beres Kursi Menkes." The method used was descriptive qualitative. The data collection technique used the listening and note-taking technique. A pragmadialectical analysis study was employed in this study, and it is based on four metatheoretical principles (functionalization, socialization, externalization, and dialectification). The method of testing the validity of the data used data source triangulation techniques and theoretical triangulation. The results show that the argumentation indicators found in the Mata Najwa talk show the speakers" expressions. The argumentation indicator was the distribution of speech acts that occur at each stage of the argument. The argumentation stages are the confrontation stage, the opening stage, the argument stage, and the closing stage. At each location, it was found that the speech acts used by the debate participants were assertive, directive, commissive, and declarative speech acts.