Najib Najib
Balai Pelatihan dan Pengembangan Badan Kependudukan dan Keluarga Berencana Nasional Provinsi Jawa Tengah

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STUDY OF THE PIEZOMETRIC SURFACE AND HYDROCOMPACTION AT CONFINED AQUIFER CAUSED THE LAND SUBSIDENCE IN SEMARANG Fahrudin, Fahrudin; Najib, Najib
TEKNIK Volume 32, Nomor 1, Tahun 2011
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Semarang city has experienced of the land subsidence that be caused by intake groundwater in confined aquiferabundant. The land subsidence happened during range of time 20 years, it’s critical boundary so that result theenvironmental damage. Hence needed a study of cause of the land subsidence. This study aim to know theposition of piezometric surface and also explain the mechanism hydrogeology when happened the landsubsidence. The study of spreading aquifer has been done by the analysis of secondary data which is in the formof drilling log data, piezometric surface and soil mechanics test obtained from PLG (Environmental Center ofGeology) Bandung. Later then, between the land subsidence and piezometric surface be overlay becamezonation. From the data made a analysis of cause of the land subsidence. This aquifer has the land subsidence.The land subsidence explainable with the experienced phenomenon fact for example degradation of piezometricsurface at confined aquifer and process of hydrocompaction. That process influenced by two factors that areassess the pore number (e) and specific gravity (Gs). The degradation of piezometric surface formed the trapezeof water table until 20 m from sea level with the mean 0.7 - 1.1 m/year. Hydrocompaction cause the degradationof number of mean pore 0.145 - 0.5 and specific gravity 0.009 - 0.073 . The degradation of piezometric surfaceand process the hydrocompaction cause the fast of land subsidence around 0.5 - 1.75 cm/year.
STUDI KERUSAKAN LINGKUNGAN AKIBAT PENAMBANGAN BGGC WILAYAH SUNGAI DI KABUPATEN PEKALONGAN Najib, Najib
TEKNIK Volume 32, Nomor 2, Tahun 2011
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Pekalongan Residence has a relatively many sand and gravel deposits particularly in river area. Nowadays,many locations have been exploited by local residences or investors from other regions. Sand and gravel miningis being done since 1980s, that’s why it can created devastated land in that surrounding area of mining. As theresult of that condition, it is called for the research to determine how devastated land condition during or aftermining. Factors used in this research to determine devastating land are mining technique, rate of mining, depthof slope mining, width of mining hole, relief of digging base, characteristics of material slope, tilt of diggingslope, reserving of top soil and overburden, erosion stage, vegetation cover, reclamation. Devastated landbased on mining has vary in low and high scale. In the gullies river,most of them in low devastated landcondition. Meanwhile, devastated land in border of river vary in low up to high. Several places which are havehigh devastated land are Sastrodirjan (Wonopringgo District), Dororejo(Doro District) and Krompeng (TalunDistrict). In deposit bar, has low up to high devastated land. High devastated land are Pododadi (Karanganyardistrict), Sastrodirjan (Wonopringgo district) and Kaligawe (Karangdadap district).
PENYUSUNAN DOKUMEN POTENSI BAHAN TAMBANG DI LUAR WILAYAH SUNGAI KABUPATEN PEKALONGAN Najib, Najib
TEKNIK Volume 31, Nomor 2, Tahun 2010
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Besides in River area, Pekalongan Regency estimated has mineral potential in some areas outside of that area.Yet local government doesn’t have data about the potency of that mineral. In consequence, it is needed toconducts mapping of mineral potency outside of river circumstance that the result will be used by localgovernment either guide taking policy in exploitation or regulation to that activity. This research used somesteps i.e. measurement and mapping phase, analysis and data processing (hypothetic reserve calculation andlaboratory mineral tests such as AAS, petrography and shear strength) and data compilation. The potency ofminerals and rocks is disseminated in 14 districts in Pekalongan Regency. Types of those mine materials areAndesite, Diorite, Limestone, Tras, Clay, Ochre, Gold and iron sand. Mining systems possibly conducted are PitType System, Eunuch Hill System and Cave System.
KAJIAN KELAYAKAN KEGIATAN PERTAMBANGAN BAHAN GALIAN GOLONGAN C DI KECAMATAN CEPOGO KABUPATEN BOYOLALI Najib, Najib; Junaedi, Junaedi
TEKNIK Volume 30, Nomor 2, Tahun 2009
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Sand and Gravel mining activity in Cepogo District come out pro and contra in that society. This researchaims to figure out the impact of mining from physical aspect. Parameters used in this research such ascondition and mining activity, hydrology, erosion, land exchanged, infrastructure condition, mass wasting,land use and reclamation effort. From those parameters are counted mining properness in those locations.According with data analysis, mining activity in eight villages in Cepogo District has improper mining(e.g. Gedangan, Sumbung, Paras, Mliwis, Sukabumi, Cepogo and Cabean Kunthi) and in one location isvery improper mining (Wonodoyo). This condition due to mining didn’t follow good mining practice(GMP).
PENYUSUNAN RENCANA INDUK PENANGANAN KAWASAN RAWAN BENCANA DI KABUPATEN SINTANG, KALIMANTAN BARAT Najib, Najib; Krisna Hidayat, Wahju
TEKNIK Volume 30, Nomor 2, Tahun 2009
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Sintang Residence is a region which has susceptible region of natural disaster mainly landslide and flood.As the result of that vulnerability, it is needed to do the research to determine zonation of susceptibility ofdisaster. Zonation of landslide is based on four parameters such as slope, annual rainfall, geology factorsand land use. Zonation of flood is based on monthly/daily rainfall, land use, topographic condition andflood terrains. Based on secondary data and primary data, Sintang residence can be divided into threesusceptibility landslide zones, i.e. intermediate, low and very low susceptible landslide zones. Susceptibleflood zones are divided into three zones i.e. high, intermediate and low susceptible flood zone. Landslidesin that area are happened due to some factors; among other things are the rocks weathered, high slopedirection and no retaining wall. Flood is happened mostly due to the position of residences which straightforward or less height toward river water level and that location near with the rivers. Flood occupied theresidences mostly pass terrain edge river or pass by Sub River or rubbish ditch that ended in the mainriver. The purposes of mitigation those disasters based on the land use
PERHITUNGAN POTENSI BAHAN TAMBANG SIRTU DI WILAYAH SUNGAI DI KABUPATEN PEKALONGAN Najib, Najib
TEKNIK Volume 30, Nomor 3, Tahun 2009
Publisher : Fakultas Teknik, Universitas Diponegoro

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Abstract

Pekalongan Residence has a relatively many sand and gravel deposits particularly in river area. Nowadays,many locations have been exploited by local residences or investors from other regions. Even though theexploitation has running, up to now the local government doesn’t know yet how many reserve indicationmaterial deposits in that area. As the result of that condition, it is called for the research to determine thepotential of mining resources in river area. The factors estimate the mining potential based on geologicconditions such as elevation and deposit types. This research use grid and trapezium method. Based onlaboratories tests showed that the dominant materials in that area is up to sand size(around 87 – 98%). Thepotential of deposits is divided into three i.e. river part, levee part and land part. The total of potential in eachdistrict are Kesesi (515.625 m3), Kajen (78.295m3), Karanganyar (1.938.751m3), Wonopringgo( 1.334.375 m3),Doro( 1.984.375 m3), Talun( 1.355.625 m3), Karangdadap( 140.150 m3) and Kedungwuni( 130.000 m3).
INFLUENCE OF GEOLOGICAL CONDITION TOWARDS SLOPE STABILITY ON LANDSLIDE: CASE STUDY IN TENGKLIK VILLAGE, TAWANGMANGU DISTRICT, KARANGANYAR REGENCY, CENTRAL JAVA PROVINCE, INDONESIA Najib, Najib; Karnawati, Dwikorita; Sudarno, Ignatius
Journal of Applied Geology Vol 2, No 3 (2010)
Publisher : Geological Engineering Department Universitas Gadjah Mada

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Abstract

A rain-induced landslide has occured in Guyon Village, Tengklik Tawangmangu District Karanganyar Regency, Central Java Province, Indonesia on February 2009. The movement was initiated by crack occurrence, 30 cm in depth and 2 meter in length. Such crack continuously developed in depth, extention and numbers, until then it resulted in land subsidence up to 260 cm in depth. Accordingly, ten houses were damaged and ten of families must be evacuated. This subsidence is very potential to further grow and create more consequences for human life and houses / land damage. Therefore, this research is carried out to understand the influence of geological factors and rainfall to the landslide phenomena. This research conducted engineering geology investigation such as mapping, drilling, insitu test, XRD test, soil mechanic test and slope stability analysis by limit equilibrium method i.e. Seep/W and Slope/W. By those research activities, the cause and mechanism of landslide can be understood. Rainfall characteristics which triggered such landslide can also be identified. Based on those investigations, it is found that the landslide occurred in slow rate sliding (creep) due to the control of slope stratigraphy conditions and gentle slope inclination, which is induced by rainfall. Stratigraphy condition that plays important role in landslide mechanism are the permeable layers consisted of sandy silt (shear strength 12 kPa) and silty sandstone (shear strength 18 kPa) overlaid above impermeable andesite breccia (shear strength 104 kPa). Undulating slope may induce landslide in creep rotational type. Based on slope stability simulation, it is known that rainfall triggered landslide is rainfall 20 mm/ day average precipitation in 55 days and rainfall 20 mm/ day average precipitation in 49 days followed by one day with 178 mm/ day average precipitation. Keywords: Landslides, slope stability
Pengetahuan Klien dan Kualitas Pelayanan sebagai Dasar Pemilihan Alat Kontrasepsi Hormonal Najib, Najib
Jurnal Kesehatan Masyarakat Nasional Vol. 6 No. 3 Desember 2011
Publisher : Faculty of Public Health Universitas Indonesia

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Abstract

Tingkat pemakaian kontrasepsi hormonal oleh akseptor Keluarga Berencana di kelurahan Muktiharjo Kidul kota Semarang yang tinggi diduga merupakan dampak tidak diberikannya informasi yang luas tentang kelebihan dan kekurangan alat kontrasepsi dan pelayanan kontrasepsi yangberkualitas. Penelitian ini bertujuan untuk mengetahui hubungan pengetahuan dan kualitas pelayanan dengan pemilihan alat kontrasepsi hormonal pada pasangan usia subur di kelurahan Muktiharjo Kidul. Jenis penelitian adalah explanatory study dengan pendekatan cross sectional yang dianalisis secara deskriptif. Penarikan sampel dilakukan secara acak dari populasi pasangan usia subur yang menggunakan alat kontrasepsi di kelurahan Muktiharjo Kidul kota Semarang. Hasil penelitian menunjukkan bahwa prevalensi pasangan usia subur yang menggunakan kontrasepsi hormonal dipengaruhi oleh pengetahuan yang baik dan pelayanan yang berkualitas.Statistik menunjukkan bahwa ada hubungan antara pengetahuan dan kualitas pelayanan dengan pemilihan alat kontrasepsi.Kata kunci: Pengetahuan, kualitas pelayanan, kontrasepsiAbstractThe high level of hormonal contraceptive using by Family Planning acceptor in Muktiharjo, Kidul, Semarang, suspectedly caused by lackness of information given about advantages and disadvantages of contraceptives and high quality of service. This research conducted to identify relationship of knowledge and service quality in selecting hormonal contraceptives on reproductive age couple in Muktiharjo, Kidul. The type of the research is explanatory study uses cross sectional approach and descriptive analysis. Sample are collected randomly from reproductive age couple which use hormonal contraceptives in Muktiharjo, Kidul, Semarang. This study result that productive age couple using hormonal contraceptives prevalence affected by good knowledge and high quality service. Statistics show thatthere is a relationship between knowledge and service quality in the matter of selecting contraceptives.Key words: Knowledge, service quality, contraception
Penentuan Zona Gerakan Tanah dan Analisis Kemantapan Lereng di Kecamatan Klego, Kabupaten Boyolali, Jawa Tengah Marani, Monalisa Isma Rikma; Najib, Najib; Ali, Rinal Khaidar
Jurnal Geosains dan Teknologi Vol 1, No 3 (2018): November 2018
Publisher : Universitas Diponegoro

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Abstract

Bencana gerakan tanah merupakan salah satu jenis bencana yang sering terjadi, baik secara alamiah maupun buatan, yang dampaknya menimbulkan korban jiwa dan kerusakan infrastruktur (Noor, 2011). Kecamatan Klego, Kabupaten Boyolali merupakan wilayah yang perkembangan sarana infrastrukturnya cukup tinggi, tetapi juga berpotensi mengalami gerakan tanah. Penelitian ini bertujuan untuk mengetahui kondisi geologi, tingkat kerentanan gerakan tanah dan kestabilan lereng di Kecamatan Klego. Geologi Kecamatan Klego terdiri dari batulanau, breksi laharik, breksi piroklastik dan endapan alluvium, struktur geologi terdiri dari sesar geser sinistral dengan kedudukan strike dan dip N 325o E/52o, bersifat minor. Faktor penyebab terjadinya gerakan tanah di Kecamatan Klego adalah kondisi kemiringan lereng yang curam, litologi/ material penyusun lereng yang telah lapuk, dan faktor pemicu berupa infiltrasi air berlebihan ke dalam lereng ketika intensitas hujan tinggi. Kecamatan Klego termasuk daerah dengan tingkat kerawanan zona Tipe B, yang terbagi menjadi 3 tingkat, yaitu kawasan dengan tingkat kerawanan tinggi (kemiringan lereng 25% - 40%), tingkat kerawanan sedang (kemiringan lereng 8% - 16%), dan tingkat kerawanan rendah (kemiringan lereng 21% - 31%). Nilai Faktor Keamanan (FK) setelah menggunakan beban tambahan pada 5 titik adalah 1,28-1,22 (Lokasi 1), 1,54-1,49 (Lokasi 2), 0,62-0,61 (Lokasi 3), 5,68-5,71 (Lokasi 4), dan 0,66-0,68 (Lokasi 5). Berdasarkan hasil tersebut, kondisi lereng di Kecamatan Klego terdiri dari lereng relatif stabil dan labil. Nilai FK yang aman ketika diberikan beban tambahan adalah 1,5. Tidak disarankan memberikan beban yang berlebih di atas lereng dengan FK 1,5. Perlu dilakukan upaya penanggulangan dan pengendalian bahaya gerakan tanah di Kecamatan Klego seperti mengubah geometri lereng, membuat dinding penahan dari batuan dan parit permukaan pada lereng yang tidak stabil, serta perlindungan sistem hidrologi kawasan.
Re-Evaluasi Perencanaan Pengembangan Kota Baru Berdasarkan Informasi Geologi Teknik Di Walini Kecamatan Cikalong Wetan, Kabupaten Bandung Barat, Provinsi Jawa Barat Khasanah, Wahdatul; Najib, Najib; Buana, Taufiq Wira
Teknik PWK (Perencanaan Wilayah Kota) Vol 8, No 1 (2019): Februari 2019
Publisher : Jurusan Perencanaan Wilayah dan Kota

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Abstract

Development plans for new cities will be held in the Walini area, Cikalong Wetan District, West Bandung Regency. The purpose of this study is to provide geological information, engineering geology and re-evaluate the development location a new city based on a map of engineering geological capabilities. The research methode used is collected the physical properties in field includes soil / engineering properties, geomorphological conditions, geological structure and depth of groundwater level, then collected maps of geological disaster and landuse maps, the preparation of engineening capability map is carried out by weighting and overlaying maps in ArcGIS. Based on geomorphological conditions, the study location is consists of volcanic landforms (30 - 90) and steep structural hills (170 - 270). The engineering geological unit of the study location is divided into intercession of sandstone-claystone, breccia, gravel sandstone and clay silt units. The depth of the groundwater level ranges from 5 m - 20m. Geological disaster maps are used to support the preparation of a engineering geological capability map which include a vulnerability map of soil movements, earthquake vulnerability maps, volcanic hazard zones and flood vulnerability maps. The zone of technical geology capability at the study location consists of very low, low, medium and high engineering geological capabilities zones.