scholarly journals Age and Depositional Environment of Walat Formation Based on Palynological Analysis in Sukabumi Regency, West Java, Indonesia

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Rizki Satria Rachman ◽  
Winantris ◽  
Budi Muljana
Keyword(s):  
Data Analysis ◽  
Chemical Treatment ◽  
Depositional Environment ◽  
Treatment Method ◽  
Late Eocene ◽  
West Java ◽  
Palynological Analysis ◽  
First Occurrence ◽  
Pollen And Spores

AbstractWalat Formation is equivalent to Bayah Formation. This formation is the beginning of Bogor basin deposition. In this case, age and environment of this formation have been analyzed by previous researchers, but the results of age and environment interpretations have different ranges, especially from its palynological aspect which until now Walat Formation is rarely analyzed using this aspect. This research was conducted to identify the age and depositional environment of Walat Formation in Sukabumi region by using pollen and spores to confirm different interpretations of previous studies. Measure section was carried out in sampling and chemical treatment method was carried out to see palynomorph content in the rock. Furthermore, data analysis was carried out with range of interval zones and pollen grouping based on their environment.The results show that Walat Formation has Late Eocene age based on the interval zone between first occurrence of Verrucatosporites usmensis and Meyeripollis naharkotensis, and the last occurence of Proxapertites operculatus, Proxapertites cursus, and Cicatricosisporites eocenicus. Walat Formation has fluvial depositional environment characterized by the dominance of Proxapertites operculatus and Proxapertites cursus. The results of this study confirm that the Walat Formation has an Eocene age and a fluvial depositional environment from a palinological aspect.

scholarly journals Proxapertites from Walat Formation, Sukabumi, West Java, Indonesia

2021 ◽  
Vol 6 (1) ◽  
pp. 1-8
Author(s):  
Rizki Satria Rachman ◽  
Winantris ◽  
Budi Muljana
Keyword(s):  
Late Eocene ◽  
West Java ◽  
Oblate Spheroidal ◽  
Pollen And Spores ◽  
Ancient Rock

Proxapertites have become one of the most significant indicators of ancient rock in Indonesia. Walat Formation is one of the oldest rocks exposed in Sukabumi, West Java, Indonesia. These Proxapertites have not been described in detail about their characteristics in previous studies, especially on Walat Formation. Therefore, knowing the characteristics of Proxapertites becomes interesting, especially in Walat Formation, which can be a reference for the characteristics of the late Eocene Proxapertites (37.8 - 33.9 million) in Indonesia. Acetolysis method was carried out for the preparation of pollen and spores; description and determination were carried out to see the characteristics of Proxapertites that present in Walat Formation. Result, there are three types of Proxapertites. Proxapertites operculatus have sizes 23 – 86 µ with average 40.5 (P) and 51.1 (E) µ, index PE 0,43 - 1, Peroblate – Subspheroidal – Oblate Spheroidal, Fine-Reticulate ornamentation, and Asymmetric Monosulcate aperture. Proxapertites cursus have sizes 23 – 86 µ with average 39.8 (P) and 49.8 (E) µ, index PE 0.51 - 1, Oblate – Subspheroidal – Oblate Spheroidal, Reticulate ornamentation, and Asymmetric Monosulcate aperture. Whereas Proxapertites psilatus have sizes 29 – 75 µ with average 42.3 (P) and 52.5 (E) µ, index PE 0.58 - 1, Oblate – Subspheroidal – Oblate Spheroidal, Psilate ornamentation, and Asymmetric Monosulcate aperture. These three Proxapertites can be distinguished by their type of ornamentation. Meanwhile, other aspects have similar characteristics and are affected by the appearance of individual pollen on the slide during preparation.

scholarly journals Sedimentology and depositional environment of the Late Eocene marine siliciclastic to evaporite transition in the Sivas Basin (Turkey)

2021 ◽  
pp. 105151
Author(s):  
Alexandre Pichat ◽  
Guilhem Hoareau ◽  
Michel Lopez ◽  
Jean-Paul Callot ◽  
Jean-Claude Ringenbach
Keyword(s):  
Depositional Environment ◽  
Late Eocene ◽  
Sivas Basin

Depositional environment and characteristics of Late Eocene carbonaceous swampy tidal flat facies in the Fayoum Basin, Egypt

2018 ◽  
Vol 200 ◽  
pp. 45-58 ◽  
Author(s):  
Thomas Gentzis ◽  
Humberto Carvajal-Ortiz ◽  
Selim S. Selim ◽  
Sameh S. Tahoun ◽  
Moataz El-Shafeiy ◽  
...  
Keyword(s):  
Tidal Flat ◽  
Depositional Environment ◽  
Late Eocene

scholarly journals Determination of Rock Type Using Hydraulic Flow Unit Concept to Predict Permeability with Artificial Neural Network

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Ghanima Yasmaniar ◽  
Ratnayu Sitaresmi ◽  
Suryo Prakoso
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Data Analysis ◽  
Rock Type ◽  
Flow Unit ◽  
West Java ◽  
North West ◽  
Hydraulic Flow ◽  
Core Data ◽  
The North

<em>Permeability is one of the important of reservoir characteristics, but is difficult to predict it. The accurate permeability values can be obtained from core data analysis, but it is not possible to do at all of the well intervals in the field. This study used 191 sandstone core samples from the Upper Cibulakan Formation in the North West Java Basin. The concept of HFU (Hydraulic Flow Unit) developed by Kozeny-Carman is used to generate the relationship between porosity and permeability for each rock type. Afterward, to estimate the permeability value at uncored intervals, the statistical methods of artificial neural network based on log data are used on G-19 Well, G Field which is located in the North West Java Basin. Based on core data analysis from this research, the reservoir consists of eight HFU with different equations to estimate permeability for each HFU. From this reserarch, the results of permeability calculations at uncored intervals are not much different from the core data at the same depth. Therefore the approach of permeability prediction can be used to determine the value of permeability without performing core data analysis so that it can save the company expenses.</em>

scholarly journals PENGARUH KOMPETENSI TERHADAP KINERJA PEGAWAI PADA BIRO PEMERINTAHAN DAN KERJASAMA SEKRETARIAT DAERAH PROVINSI JAWA BARAT

2019 ◽  
Vol 1 (1) ◽  
pp. 87-101
Author(s):  
Akhmad Fauzi
Keyword(s):  
Data Analysis ◽  
Path Analysis ◽  
Hypothesis Testing ◽  
Employee Performance ◽  
Optimal Performance ◽  
West Java ◽  
Effect Analysis ◽  
The Government

This research is motivated by the existence of a phenomenon that occurs in the Bureau of Government and Cooperation of the Regional Secretariat of West Java Province, which is an indication of the lack of optimal performance of employees. This is suspected to be a result of the lack of optimal employee competency. The method used in this study is Explanatory survey. This method does not only explain or describe empirical facts found in the field, but will also explain the effect analysis, both partially and simultaneously in this case the influence of Employee Competence on employee performance. The number of samples studied were 42 respondents. Data analysis and hypothesis testing in this study were carried out using path analysis testing. The results of this study indicate that simultaneously employee competency has a positive and significant effect on the performance of employees in the Government Bureau and Cooperation of the Regional Secretariat of West Java Province with a contribution of 60.4%, while the remaining 39.4% is influenced by other variables not examined

Detailed Lithofacies and Architectural Facies Analyses on Mixed Carbonate-Siliciclastic Clastic Shoreline Depositional Environment of the Cibulakan Formation in Cipamingkis River, Jonggol, Bogor, West Java

2021 ◽  
Author(s):  
E. Edwin
Keyword(s):  
Spatial Variation ◽  
Depositional Environment ◽  
Field Observations ◽  
West Java ◽  
Thin Sections ◽  
Fragment Type ◽  
Interesting Study ◽  
Facies Modelling ◽  
Depositional Setting ◽  
Mixed Carbonate

Cibulakan Formation as one of the prolific hydrocarbon-bearing intervals has become an interesting study object for many researchers. The continuous outcrop of the Cibulakan Formation in the Cipamingkis River comprises claystone, sandstone, and subordinate limestone of grainstone, packstone, and wackestone facies. The outcrop should be able to give a clearer vertical and spatial variation of sandstone and limestone geometry compared to the conventional core alone. Field observations followed by measuring the section is conducted to distinguish lithofacies and to create a stratigraphic profile from the chosen interval. Samples and thin sections from sandstone and limestone lithofacies are observed further to determine fragment type variation, matrix, cement, texture, and porosity types qualitatively. Fourteen (14) lithofacies have been recognized from the observation, i.e., Slumped Sandstone (A1), Claystone (A2), Slightly-bioturbated Sandstone (B1), Cross-laminated Sandstone (B2), Parallel-laminated Siltstone (B3), Calcareous Claystone (B4), Moderately-bioturbated Sandstone (C1), Hummocky Cross-stratified Sandstone (C2), Skeletal – Coral clast Wackestone (C3), Skeletal-clast Packstone (C4), Coralline Foraminiferal Boundstone (C5), Low-angle Planar Cross-bedded Sandstone (D1), Intensely-bioturbated Sandstone (D2), and Trough Cross-bedded Sandstone (D3). There are four architectural facies in the research interval and each of them is composed of different and specific lithofacies. An ideal parasequence is composed of all Architectural Facies namely : (A) Offshore-Transition (B) Lower Shoreface (C) Upper Shoreface with the whole thickness range between 15 to 25 m and the parasequence shows thickening upward succession. The detailed information about the lithofacies and architectural facies hopefully will provide a better understanding of the facies modelling of the mixed carbonate-siliciclastic depositional setting, new insights for parasequence recognition in clastic shoreline depositional environment and become a reference for other areas lacking in core data and/or outcrop analogue.

scholarly journals Perencanaan Bumi Perkemahan Alun-Alun Suryakencana Taman Nasional Gunung Gede Pangrango, Jawa Barat

2018 ◽  
pp. 28
Author(s):  
Imam Muttaqin ◽  
Cokorda Gede Alit Semarajaya ◽  
Lury Sevita Yusiana
Keyword(s):  
Data Analysis ◽  
Field Study ◽  
National Park ◽  
Research Method ◽  
Secondary Data ◽  
Secondary Data Analysis ◽  
Inventory Analysis ◽  
West Java ◽  
Thinking Process

Camping ground planning of Alun-alun Suryakencana in Mt. Gede Pangrango National Park, West Java. A good campsite requires a plan. Planning is done zoning area that can be used as a camping area without disturbing the existing ecosystem and equipped facilities so that users can feel comfortable while in the area of the campground. Alun-alun Suryakencana at an altitude of 2750 m asl is part of the Mount Gede Pangrango National Park of West Java. This research was conducted in October 2016-August 2017, this research method refers to Rachman's (1984) complete thinking process in Norma (2013) which applies secondary data analysis at field study stage which consists of inventory, analysis, synthesis, concept, and planning. The final result of this planning is a Campsite Plan that is implemented in Alun-alun Suryakencana.

EFFECT OF SURFACE PASSIVATION ON CAPACITANCE–VOLTAGE CHARACTERISTICS OF Sn/p-Si SCHOTTKY CONTACTS

2011 ◽  
Vol 25 (04) ◽  
pp. 531-542
Author(s):  
CABİR TEMİRCİ ◽  
BAHRI BATI
Keyword(s):  
Chemical Treatment ◽  
Room Temperature ◽  
Surface Passivation ◽  
Anodic Oxide ◽  
Treatment Method ◽  
Schottky Contacts ◽  
Metal Insulator ◽  
Current Voltage ◽  
Capacitance Voltage ◽  
Effect Of Surface

We have fabricated the Sn/p-Si Schottky barrier diodes with the interfacial layer metal–insulator–semiconductor (D-MIS) and the surface passivation metal–semiconductor MS (D-MS) by the anodization or chemical treatment method. The current–voltage (I–V) and capacitance–voltage (C–V) characteristics of the devices were measured at room temperature. We obtained that the excess capacitance (C0) value of the MIS Sn/p-Si diode with the anodic oxide layer of 16.88 pF and 0.12 pF for the MS Sn/p-Si ideal diode with the surface passivation by the anodization or chemical treatment method from reverse bias C–V characteristics. Thus, we have succeeded to diminish the excess capacitance value to the limit of 0.12 pF for the MS Sn/p-Si diode by using the anodization or chemical treatment method.

Sign in / Sign up

Export Citation Format

Share Document