scholarly journals Studi karakteristik gerusan lokal pada beberapa tipe pilar jembatan

2017 ◽  
Vol 12 (1) ◽  
pp. 89-104
Author(s):  
Sarwono Sarwono
Keyword(s):  
Research Method ◽  
Field Survey ◽  
Flow Direction ◽  
Discharge Rate ◽  
Physical Model Test ◽  
Sheet Pile ◽  
Flow Discharge ◽  
River Bed ◽  
Pile Type ◽  
Different Characteristics

The local scouringcharacteristicsuroundings several bridge pillars forms have a different characteristics, some forms of pillars of the bridge are considered optimum when equipped with the data: discharge, slope of riverbed, material, and on the same flow direction, that will produce the most shallow scouring. The objective of this study is to find the form of pillars that will generate the most superficial scouring. The study is conducted at the Laboratory of River in Surakarta. The used flume has length of 10.00 m, width 0.40 m and height of 0.40 m. The forms of pillar studied are two cylindrical pillars, sheet pile and full walls pillar. The slope of the riverbed (i) are varied, there are three: 0.006, 0.0125 and 0.020. The flow discharge rate there are five variations: 5,37 m3/s, 8,94 m3/s, 12,52 m3/s, 14,31 m3/s, 17,89 m3/s. Land was used at material for river bed, and, there are three kinds of value D50: 0.60 mm, 0.80 mm and 1.00 mm. The research method includes: a field survey, two dimension physical model test with 1:20 scale.The results showed for each pillar shapes have different characters. The deepest scouring suroundings the pillar beside the point, at the beginning of the first minute to the 20th minute in a sudden deep scour the riverbed and form of river bed suroundings are the pillars up and down irregularly. In the 20th minute until the end of the stream scouring decreased almost linearly lines are horizontzl. In general the pile type pillars was found to cause the minimum scouring than other pillar shapes.

GRANOLA BAR YANG DIFORTIFIKASI DENGAN PROTEIN DAGING KERANG SEBAGAI SNACK SEHAT BAGI ANAK BERKEBUTUHAN KHUSUS

EKOLOGIA ◽  
2020 ◽  
Vol 18 (2) ◽  
pp. 78-82
Author(s):  
Sata Yoshida Srie Rahayu ◽  
Tri Aminingsih ◽  
Yulianita .
Keyword(s):  
Special Needs ◽  
Analysis Of Variance ◽  
Research Method ◽  
Nutritional Value ◽  
Food Products ◽  
Children With Special Needs ◽  
Organoleptic Test ◽  
Anodonta Woodiana ◽  
Different Characteristics

Flour of Anodonta woodiana meat may be added in the manufacture of food products such as granola bar. The aim of addition is to increase the nutritional value on snacks needed by children with special needs through fortification. This research method was done by making products granola bar in three formulas: without the addition of shells flour, the addition of 2.8 gram, and 5.6 gram. Granola bar were made for consumption by children (7-9 years old) and teenager (10-18 years old). Tests performed included organoleptic test. The results of organoleptic test between three formulas of produced granola bar have different characteristics in flavor parameter. The results of the analysis of parameters of color, aroma, and flavor tested by analysis of variance software showed that the most preferred formula is the second formula with the addition 2.8 gram of mussel meat flour. This granola bar snack is a healthy snack that is safe for consumption by children with special needs, because it is made from ingredients that do not contain flavorings, dyes and artificial preservatives.

Pengaruh Curah Hujan dan Debit Air Terhadap Produktivitas Energi Listrik yang Dihasilkan Pada Pembangkit Listrik Tenaga Air (Studi Kasus: Sub Unit PLTA Kracak, Kabupaten Bogor Jawa Barat)

2020 ◽  
Vol 5 (1) ◽  
pp. 56-60
Author(s):  
Wildan Gunawan ◽  
Suyitno Muslim ◽  
Imam Arif Rahardjo
Keyword(s):  
River Discharge ◽  
Research Method ◽  
Rainfall Intensity ◽  
Discharge Rate ◽  
Electrical Power ◽  
Electric Energy ◽  
Energy Productivity ◽  
Rain Fall ◽  
Average Rain

This research is aimed to understand the effects of  rain fall and discharge rate towards hydro electric power plant productivity (case study at Kracak Sub Unit HPP, Bogor Regency Jawa Barat). Multiple regression tecnique analysis is used as research method with quantitative approach for describing the effects of rain fall and discharge rate towards hydro electric energy productivity. Based on Sub Unit PLTA Kracak during a highest down pour in June 2018 has gained electrical power about 173,583 kWh for 15,84 mm rain fall and the lowest rain fall in July 2018 is 0,86 mm only obtain 49,772 kWh electrical power with the average rain fall record in three stations is 8,9592 mm. Mean while, for the highest river discharge rate happened in February is 10,08 m3/detik which produce 198,296 kWh electrical power and the lowest in June that only gained 3,53 m3/detik which produce 49,772 kWh electrical power with the average of river discharge rate in 2018 is only 7,9858 m3/detik. The average of electrical power it self is only 156,0105 kWh for 8,9592 mm of rainfall and 7,9858 m3/detik river discharge rate record in 2018. The conclusion oh this research is the discharge rate in headwaters area is affected by rainfall intensity, but not necessarily affected to hydro electric energy productivity.   ABSTRAK Tujuan dari penelitian ini adalah untuk mengetahui pengaruh curah hujan dan debit air terhadap produktivitas energi listrik yang dihasilkan pada pembangkit listrik tenaga air (Studi Kasus: Sub Unit PLTA Kracak, Kabupaten Bogor Jawa Barat). Metode yang digunakan dalam penelitian ini adalah metode deskriptif dengan pendekatan kuantitatif teknik analisis data regresi berganda untuk mendiskripsikan data penelitian curah hujan dan debit air terhadap produktivitas energi listrik yang dihasilkan. Berdasarkan data hasil penelitian yang diperoleh di Sub Unit PLTA Kracak data curah hujan tertinggi pada tahun 2018 di Bulan Juni sebesar 15,84 mm dapat menghasilkan energi listrik sebesar 173,593 kWh dan terendah di Bulan Juli sebesar 0,86 mm dapat menghasilkan energi listrik sebesar  49,772 kWh dengan rata-rata pertahun 2018 yaitu sebesar 8,9592 mm di tiga stasiun. Sedangkan data debit air pada tahun 2018 tertinggi di Bulan Februari sebesar 10,08 m3/detik dapat menghasilkan energi listrik sebesar 198,296 kWh dan terendah di Bulan Juli sebesar 3,53 m3/detik dapat menghasilkan energi listrik sebesar 49,772 dengan rata-rata pertahun 2018 debit air sebesar 7,9858 m3/detik. Dengan rata-rata curah hujan 8,9592 mm dan debit air 7,9858 m3/detik dapat menghasilkan energi listrik rata-rata pertahun 2018 sebesar 156,0105 kWh selama tahun 2018. Dapat disimpulkan curah hujan tidak berpengaruh langsung terhadap produktivitas energi listrik yang dihasilkan sedangkan debit air berpengaruh terhadap produktivitas energi listrik.

scholarly journals EVALUASI REPRODUKSI INDUK KELINCI NEW ZEALAND PADA BERBAGAI PARITAS (Studi Kasus di UD. Alastika Jaya Desa Tulungrejo Kecamatan Gandusari Kabupaten Blitar)

2021 ◽  
Vol 13 (1) ◽  
pp. 23-28
Author(s):  
Iva Mardiani Fatimah ◽  
Nita Opi Ari kustanti ◽  
Edya Moelia Moeis
Keyword(s):  
Data Analysis ◽  
New Zealand ◽  
Litter Size ◽  
Research Method ◽  
Field Survey ◽  
Secondary Data ◽  
Average Value ◽  
Days Open ◽  
Size At Birth

The aim of this study is to find out reproctive performance of New Zealand doe in UD. Alastika Jaya. This study use 35 of 51 doe population as the sample and field survey to take primary and secondary data from observation and interview as the research method.  The result of observation and data analysis of study indicate that average value of service per conception (S/C), long of days open, gap of bred after whelped, interval of birth, litter size at birth, and litter size at weaning in a row is 2,17+0,57, 33,33+16,56 days, 32,6+22,14 days, 65,67+16,54 days, 6,65+2,54 kits, dan 4,24+2,05 kits

scholarly journals SANKSI KERJA SOSIAL, SEBUAH ALTERNATIF PENALISASI TERHADAP PELANGGARAN LALU LINTAS DI KOTA PAREPARE

2019 ◽  
Vol 2 (2) ◽  
pp. 102-128
Author(s):  
Firmansyah
Keyword(s):  
Social Work ◽  
Research Method ◽  
Field Survey ◽  
Legal Issues ◽  
Library Research ◽  
Litigation Process ◽  
Traffic Violations ◽  
The Creation ◽  
The Right ◽  
The Impact

Social work sanctions is an alternative in handling traffic violations without going through a litigation process, this research aims; First, to find out the right strategies related to social work sanctions. Second, to find out the factors that influence the implementation of social work sanctions and finally to find out the impact of the application of social work sanctions. The research method used is a socio-normative research method. Data collection techniques for library research and interviews. The results of this study indicate that the strategies is used in implementing social work sanctions are; Field survey, socialization Collaborate with the police to conduct sweeping on the object of research, carry out social / social work sanctions and install stickers to control and there needs to be a conscious area or traffic order. namely the existence of the concept of ultimum Remedium. It’s mean that criminal is the last step and the Discretion is a power or authority that is carried out based on the law for consideration and belief and emphasizes moral considerations rather than legal considerations. The inhibiting factors are; Written rules or regulations / substances that do not yet exist, lack of socialization and legal culture or attitudes of both the community and the police are still low regarding legal issues. Finally, the impact of the implementation is the creation of rules or laws that specifically regulate the issue of social work sanctions. The next thing is the creation of the Community Police Concept

Numerical Investigation on Behaviors of Stiffened Large Suction Cap for Offshore Suction Cofferdam

2020 ◽  
Author(s):  
Jeongsoo Kim ◽  
Yeon-Ju Jeong ◽  
Min-Su Park ◽  
Sunghoon Song
Keyword(s):  
Finite Element ◽  
Structural Design ◽  
Nonlinear Finite Element ◽  
Finite Element Models ◽  
Suction Pressure ◽  
Sheet Pile ◽  
Large Size ◽  
Critical Issues ◽  
Stress And Deformation ◽  
Pile Type

Abstract This study introduces a large offshore cofferdam installed by suction, unlike conventional ones such as a sheet-pile type, and proposes an effective suction cap for the cofferdam. In structural design view of the cofferdam, there are several critical issues due to its large size. This study conducted structural analyses of stiffened caps for large offshore suction cofferdam using fully nonlinear finite element models, and analyzed changes in behaviors of the cap due to stiffener arrangements to provide design insights. For finite element models, the diameter and the thickness of the suction cap (circular plate only) are 20m and 0.07m, respectively. Suction pressure on the cap was assumed to be 100kPa, all parts of the cofferdam except the cap are considered as boundary conditions. By investigating conventional suction anchors, several stiffener arrangement patterns on the cap of suction cofferdam were derived, and each arrangement was estimated by comparing stress and deformation of the cap. Also, reaction distributions on the edge of the cap were investigated to analyze effects of the stiffener arrangement on the interface behaviors between cap and cofferdam.

Modeling of major cliff destabilizations and subsequent lahars in the Prêcheur catchment, Martinique.

2020 ◽  
Author(s):  
Marc Peruzzetto ◽  
Clara Levy ◽  
Yannick Thiery ◽  
Gilles Grandjean ◽  
Anne Mangeney ◽  
...  
Keyword(s):  
3D Models ◽  
Numerical Code ◽  
Water Model ◽  
Shallow Water Model ◽  
Flow Discharge ◽  
Reservoir Volume ◽  
River Bed ◽  
Major Period ◽  
Topographic Surveys ◽  
Traveled Distances

<p>The Prêcheur river is located to the West of Montagne Pelée, in the Northern part of Martinique island. For several decades it has produced numerous lahars that directly threaten the Prêcheur village, at the mouth of the river. In recent years, the most important lahars have been correlated to massive collapses of the Samperre cliff, 9 km upstream from the sea, that create a reservoir of loose material at the bottom of the cliff. In 2010, a lahar started from this reservoir, destroyed a bridge and inundated part of the Prêcheur village. A new major period of collapses of the Samperre cliff started on 2 January 2018, involving more than 4 × 10<sup>6</sup> m<sup>3</sup> of material. In the following days, intense rainfalls triggered several lahars that reached the Prêcheur village but remained confined in the river bed. Since then, lahars and collapses have continued to occur, even though their frequency has decreased with time and their intensity is smaller compared to the onset of the crisis. One single lahar overflowed the river bed on 22 February 2018 without significant impact on infrastructures.</p><p>In this study, we test different possible scenarios to model the first and most important phase of the collapse of the Samperre cliff, that occurred in early January 2018, with the shallow-water model SHALTOP. We constrain the collapse geometry with photogrammetric 3D models and LIDAR topographic surveys, acquired in 2010 and in late January 2018. We also consider an intermediate volume to take into account a possible retreat of the cliff face between 2010 and 2018. The modeled traveled distances are compared to field observations. Finally, we use geomorphological and geological observations to identify potentially unstable structures within the cliff, and model the associated collapses.</p><p>These simulations provide insights on the possible geometry (extent and depth) of the debris reservoir at the bottom of the cliff, after a major collapse episode. This is of prior importance in order to estimate the location and volume of future lahars. In order to investigate their dynamics, we model the major 2010 lahar, for which the initial debris reservoir volume is known (about 2 Mm<sup>3</sup>). We first simulate the progressive remobilization of the reservoir by water with the r.avaflow numerical code. In a second test, we impose instead a constant flow discharge upstream until the same volume has been released. We test different parameters to identify which ones have the most significant influence on the lahar travel time, from its initiation until it reaches the Prêcheur village.</p>

Characterization and Micromilling of Flow Induced Aligned Carbon Nanotube Nanocomposites

2013 ◽  
Vol 1 (1) ◽  
Author(s):  
Mehdi Mahmoodi ◽  
M. G. Mostofa ◽  
Martin Jun ◽  
Simon S. Park
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Cutting Forces ◽  
End Milling ◽  
Flow Direction ◽  
High Strength ◽  
Force Model ◽  
Micro End Milling ◽  
Different Characteristics ◽  
Milling Forces

Carbon nanotube (CNT) based polymeric composites exhibit high strength and thermal conductivity and can be electrically conductive at a low percolation threshold. CNT nanocomposites with polystyrene (PS) thermoplastic matrix were injection-molded and high shear stress in the flow direction enabled partial alignment of the CNTs. The samples with different CNT concentrations were prepared to study the effect of CNT concentration on the cutting behavior of the samples. Characterizations of CNT polymer composites were studied to relate different characteristics of materials such as thermal conductivity and mechanical properties to micromachining. Micro-end milling was performed to understand the material removal behavior of CNT nanocomposites. It was found that CNT alignment and concentrations influenced the cutting forces. The mechanistic micromilling force model was used to predict the cutting forces. The force model has been verified with the experimental milling forces. The machinability of the CNT nanocomposites was better than that of pure polymer due to the improved thermal conductivity and mechanical characteristics.

The Damage Inspection and Safety Assessment on Steel-Sheet Pile Wharf Structural System

2006 ◽  
Vol 324-325 ◽  
pp. 1221-1224 ◽  
Author(s):  
H.H. Lee ◽  
P.Y. Chang
Keyword(s):  
Safety Assessment ◽  
Steel Sheet ◽  
Structural System ◽  
Sheet Pile ◽  
Two Stage ◽  
Second Stage ◽  
Inspection Strategy ◽  
Pile Type ◽  
The Cost

This study proposes a procedure of damage inspection for the infrastructure in the harbor. Because most infrastructures in the harbor are submerged under the water the damage inspection is very difficult to process. Normally, divers with special scheme of damage inspection are required and the cost is very expensive. Therefore, a two-stage inspection strategy is proposed. After the first stage of inspection the more detailed second stage inspection will be requested dependent on the examination results. In the second stage of inspection particularly, it is focused on the wharf structures of steel-sheet pile type, where the related items are identified corresponding to the characteristics of the structural system.

scholarly journals Perubahan Penggunaan Lahan Dan Dampaknya Terhadap Erosi Di Daerah Aliran Sungai Wae Lela Kota Ambon

Agrologia ◽  
2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Rambli Buton ◽  
Ruddy Soplanit ◽  
Agusthinus Jacob
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Research Method ◽  
Field Survey ◽  
Land Use Changes ◽  
Research Area ◽  
Land Conservation ◽  
Synthetic Approach ◽  
Multiple Cropping ◽  
Observation Distance

High population of inhabitans in watershed area is an important factor which increase watershed’s damage so that, proper land conservation should be done. Research in the watershed Wae Lela has been done to analyze the dominant factors causing soil erosion due to changes in land use, and determine the amount of erosion after land use change in the watershed. The research method was field survey with a synthetic approach pattern by using free surveys observation distance. This observation distance used according to the pattern of land use changes on certain land units, with the type of profile observations/boring. The study found that land use in the watershed Wae Lela has undergone considerable changes in the last 25 years between 1988-2013. Natural forest generally has been transformed to be used for landfarming. Fram planted with multiple cropping of cloves, nutmeg, coconut, tubers, vegetable was become less effective to prevent erosion. This change leads to increased erosion which mainly occurred in mixed farm area up to  6415.06 t/ha/year; covered an area of  220.6 ha or 26.2% of the research area.

Sign in / Sign up

Export Citation Format

Share Document