Judul: Model matematis perubahan kualitas air sungai di daerah aliran sungai (DAS) Cisadane
Abstrak: Air merupakan salah satu kebutuhan pokok bagi manusia maupun makhluk hidup lainnya. Berbagai sumber air yang ada di muka bumi telah membentuk suatu sistem interaksi yang erat dengan makhluk hidup di dalamnya. Hubungan ketergantungan di dalam ekosistem bumi akhirnya menempatkan air sebagai bagian yang tak terpisahkan dari setiap komponen makhluk hidup. Salah satu sumber air yang memiliki peranan penting bagi masyarakat Wilayah Bogor dan Tangerang adalah Daerah Aliran Sungai (DAS) Cisadane. Namun, seiring dengan perjalanan waktu kualitas air DAS Cisadane telah mengalami penurunan. Oleh karena itu, dibutuhkan suatu model matematis perubahan kualitas air DAS Cisadane untuk memperkirakan nilai kualitas air DAS pada setiap ruas DAS dari segmen hulu sampai hilir. Metode penelitian yang digunakan dengan mengindentifikasi karakteristik parameter kualitas air yang terdiri dari BOD, COD, dan Fecal coli pada beberapa titik sebagai representatif segmen hulu, tengah, dan hilir dari tahun 2003-2006 dengan menggunakan perbandingan baku mutu air berdasarkan Peraturan Pemerintah Nomor 82 Tahun 2001 dan memperkirakan pola penyebaran BOD, COD, Fecal coli dari analisa kualitas air dengan menggunakan persamaan regresi.
Keyword: Pencemaran air, Analisa regresi

Judul: Model Matematis Perubahan Kualitas Air di Daerah Aliran Sungai (DAS) Citarum, Jawa Barat
Abstrak: Water is vital requirement in many metabolic process of organism. Water stock which is stabil can’t meet the requirements of organism which is keeps increasing. It becomes worst by decreasing of water’s quality caused by human’s bad activity such as release waste into river. There are many watercourse in Indonesia which has been polluted and don’t worth to be consumed for many requirements. One of them is Citarum river in West Java. Citarum river has 270 km long. Its upstream is in Wayang mountain, Bandung regency. Its watercourse passing through some regions in Purwakarta regency and downstreamed in Jakarta, Bekasi and Karawang. There are three weirs in DAS Citarum (Saguling, Cirata and Jatiluhur) which functioned to controll water for irrigation (>85%) and the rest for electrical generator, drinking water and industrial requirements. Because of the important functions of Citarum river and its three weirs, thus needed a mathematic model of water quality change to estimate the value of water quality from upstream to downstream. The objectives of this research are to knowing water quality of Citarum river in BOD, COD and TSS parameters which is taken from 10 observation points from upstream to downstream, to make a model of water quality changes, and to observate the effect of three weirs in DAS Citarum to water quality changes of Citarum river. This research held by collect secondary data of water quality in 2008 and some other supporting data which is proccessed by Microsoft Office Excel 2007 Software, compared with Goverment Regulation Number 82 Year 2001 and its graphics analyzed and then made its mathematic model. The result of this research is model of water quality changes of DAS Citarum in 2008, that is in wet month (March) for BOD parameter is y = 5E-14x3 - 9E-09x2 + 0,000x + 5,902 with R2 = 0,892, COD parameter is y = 2E-14x3 - 4E-09x2 + 0,000x + 2,433 with R2 = 0,854, and TSS parameter is y = 1E-13x3 - 3E-08x2 + 0,001x + 238,5 with R² = 0,884. Model of water quality changes of DAS Citarum in dry month (July) for BOD parameter is y = 1E-09x2 - 0,000x + 26,50 with R2 = 0,673, COD parameter is y = 7E-11x2 - 0,000x + 10,14 with R2 = 0,693 and TSS parameter is y = 3E-13x3 - 5E-08x2 + 0,002x + 190,4 with R2 = 0,963. Based on result of this research, known that BOD, COD and TSS values in each observation point from upstream to downstream has a fluctuative distribution. Distance of observation point from water spring doesn’t affect the water quality changes, depend on the existence of polluter source in thet area. Distribution pattern of water quality for those three parameters show that weir could controll water quality, that is pollutan which released from weir could be decreased because the pollutant sedimented in weir base.
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Judul: Studi Kasus Liver Neoplasia pada Anjing Shih Tzu
Abstrak: Liver neoplasia is the excessive and uncontrolled replication of hepatocytes that forms nodules visible in ultrasonography. The purpose of this study is to study and discuss the characteristic, diagnosis and treatment of liver neoplasm through the interpretation of ultrasonography and hematology in a Shih Tzu dog. Ultrasonography is conducted with a Chison Q8 ultrasound machine with a 5 to 7 MHz frequency convex probe on lateral recumbency. The blood cells, liver enzymes and nodules sizes were the main parameters in this study. The results in the period of three years from 2021 to 2023 were interpreted and supported with secondary data sources. The Shih Tzu dog is 14 years old in the year 2023 with a body weight of 5.21kg. No obvious clinical signs were observed during previous examinations. However, lethargy, vomiting and anorexia were recorded in its latest examination. Thrombocytosis, granulocytosis, high liver enzymes and hypoglycemia, which are some of the neoplastic clinical manifestations were also presented by this patient. Besides, liver neoplasm, spleen neoplasm and biliary sludge were the sonogram findings of this patient. The liver and spleen neoplasm was observed stable, while the biliary sludge volume fluctuated. The treatment strategy recorded is Ondansetron, Samylin®, Ornipural and Ursodeoxycholic acid.
Keyword: Blood biochemistry profile, Hematology, Liver Neoplasia, Shih Tzu, Ultrasonography