Judul: Faktor-Faktor Sosial Ekonomi yang Mempengaruhi Fertilitas Perempuan dengan Lama Perkawinan di Bawah 10 Tahun di Provinsi Jawa Barat
Abstrak: The high rate of population growth is the main problem faced by the development of developing countries, including Indonesia. Population explosion occurred mainly due to a decreased level of mortality (death) while the population fertility rates can not be well controlled. The purpose of this study was to determine the socio economics factors that affect fertility (births) in the Province of West Java. Information factors can be used as one tool in population control considerations. This study used the data of National Socio economic Survey of West Java Province in 2011. Response variable in this study is the number of biological children born alive, whisch is continuous, so that the proper analysis is a regression tree with CART algorithm. Regression tree in urban produce 6 end nodes with the most effective explanatory variable is the contraception status, husband’s education, expenditure per capita per month, and the use of toilet. Regression tree in rural produce 5 end nodes with the most effective explanatory variable is the status of the use of family planning, expenditure per capita per month, and the use of toilet.
Keyword: regression tree, fertility, CART

Judul: Penentuan beberapa faktor demografis dan sosial ekonomi sebagai indikator bagi tingkat fertilitas melalui analisis regresi
Abstrak: Tujuan penelitian ini untuk menentukan faktor-faktor yang mempengaruhi fertilitas dan dapat digunakan sebagai indikator bagi fertilitas pada tingkatan propinsi. Penelitian ini menggunakan model regresi linear berganda melalui prosedur kuadrat terkecil dalam pendugaan parameternya. Data yang digunakan adalah data Survei Prevalensi Kontrasepsi Indonesia (SPI, 1987) dan merupakan data agregate. Pelaksanaannya oleh Biro Pusat Statistik bekerja sama dengan Badan Koordinasi Keluarga Berencana Nasional dan Institute for Resource Development dari Westing- house. SPI'87 dilakukan pada bulan September sampai Desember 1987 di 20 dari 27 propinsi di se- luruh Indonesia. Peubah yang digunakan adalah tingkat fertilitas (Y), pendidikan ibu (X), mortali- tas anak (X), jumlah akseptor (X), frekuensi menikah lebih dari satu kali (X), usia pertama menikah (X), ibu bekerja (X) dan pendidikan suami (X). Ragam sisaan model homogen dapat dilihat dari plot antara sisaan dengan propinsi dan plot sisaan dengan dugaan. Kenormalan sisaan dapat dilihat dari plot kwantil-kwantil. Model yang didapat mencakup 6 peubah. Dari model yang didapat memberikan nilai koefi- sien determinasi sebesar 70.9%. Dari hasil analisis regresi di dapatkan bahwa hanya faktor mortalitas anak dan jumlah akseptor yang berpengaruh terhadap tingkat fertilitas. Ukuran yang dipakai adalah dalam bentuk rata-rata, proporsi dan median. Unit satuannya adalah propinsi dalam SP1'87.
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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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