PENGARUH KEMIRINGAN POROS BALING-BALING TERHADAP KECEPATAN PERAHU KETINTING

Ketinting boat in operation using propeller with engine located on deck. This position resulted in the propeller dipping by making a certain angle, in addition the depth of the propeller also overlapped the speed of the ship.This phenomenon is something very important to be examined with the aim of obtaining maximum speed in relation to the angle of tilt of the propeller and the amount of maximum thrust required.The method used is an experimental method in which the model of the ship and propeller are made according to the desired scale, and so conduct testing on the towing tank.The test result obtained is a slope that creates the optimal speed of the ketinting boat is at a slope of 18° with a speed of V = 5.05 knots and a maximum thrust of PT = 13.15 kW.

ADDITION OF HYDROFOIL TO SHIP RESISTANCE ANALYSIS ON HALASAN CLASS BASED ON VALIDATION TEST RESULT

JOURNAL ASRO ◽

10.37875/asro.v10i3.166 ◽

2019 ◽

Vol 10 (3) ◽

pp. 105

Author(s):

Sutrisno Sutrisno ◽

Wawan Kusdiana ◽

Ayip Rivai Prabowo ◽

Muhammad Askhuri

Keyword(s):

Surface Area ◽

Load Condition ◽

Maximum Speed ◽

Main Function ◽

Full Load ◽

Ship Resistance ◽

Validation Test ◽

Hit And Run ◽

Wet Surface ◽

KRI Halasan - 630 is one of the Fast Missile warships with a length of 60 Meters which apart of fast patrol boat class which belongs to TNI-AL. Accordance with the main function not only as a fast missile boat but also as a patrol ship killer, this ship was made to have a high ability in “hit and run”. Since the beginning of the manufacture and after being inaugurated as KRI in 2014 this ship is able to reach speed until 27 knot in full load. As time goes on the same conditions the speed that this ship can achieve is 25 knot at maximum speed. This can be caused by increase in value from the resistance of the ship. One way to reduce the value of the resistance of the ship is to minimize the Wet Surface Area(WSA) from the ship. By adding hydrofoil technology will produce lift force which could lift apart of the hull ship from the water so that Wet Surface Area from the ship will reduce. From the calculation, to lift on the hull of KRI Halasan Class 20 cm in full load condition at 25 knot knows that dimension for fore foil with tapered straight type are wingspan 4,6 m, wingroot 1,33 m, wingtip 0,5 m, and swept angle 11°. And dimension for aft foil with rectangular straight type are wingspan 5,3 m, wingroot and wingtip 1,365 m, and swept angle 0°. The ship resistance with hydrofoil is 265,5 KN, while in the same condition and speed from the ship without hydrofoil the value of ship resistance is 267 KN. By adding hydrofoil technology could reduce the ship resistance 1,5 KN. This values could make 19,29 KW or 25,86 Hp in power saving.Keywords : Hydrofoil technology, Ship Resistance, Halasan Class

Design of a superconducting linear synchronous motor with YBCO coil magnet

International Journal of Modern Physics B ◽

10.1142/s021797921542045x ◽

2015 ◽

Vol 29 (25n26) ◽

pp. 1542045 ◽

Cited By ~ 1

Author(s):

Jing Li ◽

Junjie Tang ◽

Ya Zhang

Keyword(s):

Experimental Method ◽

Normal Force ◽

Simulation Method ◽

Synchronous Motor ◽

Linear Motor ◽

Excitation System ◽

Superconducting Coil ◽

Superconducting Coils ◽

Superconducting Linear Motor ◽

The forces of the flat single-sided linear motor with four superconducting coils on the excitation system were presented by experimental method. The influences of the coil height and number of turns on the forces were investigated by the simulation method. Although the maximum thrust increased monotonically with the value of turns, the corresponding increment of the thrust decreased with the value of turns. The thrust reaches a certain saturation value with increasing the height of the superconducting coil. Continuing to increase the height of the coil could lead to an increase of the normal force. The superconducting linear motor is finally designed with the capability to generate thrust of 1 kN/m.

A Compact Linear Ultrasonic Motor Composed by Double Flexural Vibrator

Micromachines ◽

10.3390/mi12080958 ◽

2021 ◽

Vol 12 (8) ◽

pp. 958

Author(s):

Jiayin Li ◽

Yin Wang ◽

Ziyan Chen ◽

Fang Cheng ◽

Qing Yu

Keyword(s):

Structural Parameters ◽

Ultrasonic Motor ◽

Local Deformation ◽

Frequency Difference ◽

Modal Testing ◽

Maximum Speed ◽

Element Analysis ◽

Linear Ultrasonic Motor ◽

Optimized Model ◽

A minimized linear ultrasonic motor was proposed, and two flexural bimorph vibrators were utilized to form its stator. The construction of the linear ultrasonic motor and its operation principle was introduced. Two working modes with the same local deformation distribution were chosen on the basis of Finite Element Analysis (FEA). To obtain its optimized structural parameters, sensitivities on frequency difference were calculated, and a way of decreasing the frequency difference of two working modes was introduced. A prototype of the optimized model was made. The modal testing of the stator and its performance evaluation was conducted. The modal testing results were in good agreement with that of the simulation. The maximum speed of the prototype is 245 mm/s, and its maximum thrust is 1.6 N.

Pengaruh Model Pembelajaran Berbasis Proyek dalam Tatanan Group Investigation Terhadap Berpikir Tingkat Tinggi Di USI Pematangsiantar

Jurnal Pendidikan Biologi ◽

10.24114/jpb.v7i1.8894 ◽

2017 ◽

Vol 7 (1) ◽

Author(s):

Fenny Mustika Piliang

Keyword(s):

Experimental Method ◽

Higher Order Thinking ◽

Learning Model ◽

Higher Order ◽

Project Based Learning ◽

Learning Ability ◽

Research Instrument ◽

Thinking Ability ◽

Quasi Experimental ◽

This study aims to determine the effect of Group Investigation with Project Based Learning model towards higher order thinking. The population of this research were the total, 60 under-graduated students of Simalungun University in fourth semester. They grouped as first experimental class treated by Group Investigation combine with PJBL, for next experimental class taught by Group Investigation and for control class taught by using conventional learning model. The research instrument uses a test result of learning ability of higher order thinking. This study include quasi experimental method. The data were analyzed by helping SPSS 21.0 program using F-test (ANACOVA α = 5% ). The results shown that: The higher order thinking ability of under-graduated students of Simalungun University treated by Group Investigation were significantly high (88,60 ± 3,73; x̄ ± SD) than group investigation class (81,00 ± 4,01 (x̄ ± SD) and conventional class 74,60 ± 3,58 (x̄ ± SD) with (Fhitung=67,742; P=0,000). Therefore, it can be concluded that Group Investigation combine with PJBL were affected the students’ higher order thinking abilities

Pemanfaatan Limbah Galvalum Sebagai Substitusi Aggregat Kasar Pada Jobmix Beton

Jurnal Manajemen Teknologi & Teknik Sipil ◽

10.30737/jurmateks.v3i2.1152 ◽

2020 ◽

Vol 3 (2) ◽

pp. 332

Author(s):

Muhammad Bahrudin ◽

Agata Iwan Candra ◽

Sigit Winarto

Keyword(s):

Moisture Content ◽

Experimental Method ◽

Construction Materials ◽

Degree Of Saturation ◽

Absorption Test ◽

Test Results ◽

Percentage Absorption ◽

Test Result ◽

Pore Number

Concrete is one of the construction materials that is widely used. Currently, variations in concrete are being studied. Galvalum waste has high tensile properties but is mild. Its lightweight properties are expected to reduce the weight of the concrete itself. The purpose of this study is to find out the value of strong press, absorption, weight type (E), degree of saturation (Sr), moisture content (Wc), and porosity of the addition of galvalume waste. The method used is a experimental method. Variations in galvalum waste substitution used are 50% and 100% of the aggregate weight is roughT the sample used in the form of a cylinder size of 15cm x 30 cm with the initial quality of fc' 18.67 Mpa. The results of the strong press test showed that the galvalum waste subtitution has not been able to exceed the initial quality of the plan. The highest test result was obtained at a percentage of 50% with a strong press score of FC' 17.94 Mpa. In the percentage, absorption test results are 0.010%, the weight of the type is 2325 kg / m3, the pore number is 0.00232%, the water content is 0.108%, and porosity is 0.00108%.Beton merupakan salah satu bahan konstruksi yang banyak dipergunakan. Saat ini, pengguanaan variasi pada beton sedang banyak diteliti. Limbah galvalum memiliki sifat tarik yang tinggi namun ringan. Sifatnya yang ringan diharapkan mampu mengurangi berat beton itu sendiri. Tujuan dari penelitian ini adalah untuk mengetahui nilai kuat tekan, absorpsi, berat jenis (Ɣ), angka pori (e),derajat kejenuhan (Sr), kadar air (Wc), dan porositas dari penambahan limbah galvalum. Metode yang digunakan merupakan metode eksperimen. Variasi pensubtitusi limbah galvalum yang digunakan yaitu 50% dan 100% dari berat agregat kasar. sampel yang digunakan berbentuk silinder ukuran 15cm x 30 cm dengan mutu awal fc’ 18.67 Mpa. Hasil uji kuat tekan menunjukkan bahwa subtitusi limbah galvalum belum mampu melebihi mutu awal rencana. Hasil uji tertinggi didapat pada prosentase 50% dengan nilai kuat tekan fc’ 17,94 Mpa. Pada prosentase tersebut, didapat hasil uji absropsi yaitu 0,010%, berat jenis yaitu 2325 kg/m3, angka pori yaitu 0,00232%, kadar air yaitu 0,108% serta porositas yaitu 0,00108%.

Estimation of Optimal Speed Limits for Urban Roads Using Traffic Information Big Data

Applied Sciences ◽

10.3390/app11125710 ◽

2021 ◽

Vol 11 (12) ◽

pp. 5710

Author(s):

Hyungkyu Kim ◽

Doyoung Jung

Keyword(s):

Traffic Safety ◽

Safety Information ◽

Traffic Information ◽

Maximum Speed ◽

Speed Limit ◽

Speed Limits ◽

The Road ◽

Optimal Speed ◽

Road Users ◽

Adjustment Factors

The use of an inconsistent speed limit determination method can cause low speed limit compliance. Therefore, we developed an objective methodology based on engineering judgment considering the traffic accident rate in road sections, the degree of roadside development, and the geometric characteristics of road sections in urban roads. The scope of this study is one-way roads with two or more lanes in cities, and appropriate sections were selected among all roads in Seoul. These roads have speed limits of the statutory maximum speed of 80 km/h or lower and are characterized by various speeds according to the function of the road, the roadside development, and traffic conditions. The optimal speed limits of urban roads were estimated by applying the characteristics of variables as adjustment factors based on the statutory maximum speed limit. As a result of investigating and testing various influence variables, the function of roads, the existence of median, the level of curbside parking, the number of roadside access points, and the number of traffic breaks were selected as optional variables that influence the operating speed. The speed limit of one-way roads with two or more lanes in Seoul was approximately 10 km/h lower than the current speed limit. The existing speed limits of the roads were applied uniformly considering only the functional road class. However, considering the road environment, the speed limit should be applied differently for each road. In the future, if the collection scope and real-time collection of road environment information can be determined, the GIS visualization of traffic safety information will be possible for all road sections and the safety of road users can be ensured.

Non-Resonance Type Linear Ultrasonic Motor Using Multilayer Piezoelectric Actuators with Parallel Beams

International Journal of Automation Technology ◽

10.20965/ijat.2016.p0557 ◽

2016 ◽

Vol 10 (4) ◽

pp. 557-563 ◽

Cited By ~ 2

Author(s):

Manabu Aoyagi ◽

◽

Ryuichi Nakayasu ◽

Hidekazu Kajiwara ◽

Keyword(s):

Phase Difference ◽

Piezoelectric Actuators ◽

Ultrasonic Motor ◽

Maximum Speed ◽

Operating Voltage ◽

Orthogonal Direction ◽

Linear Ultrasonic Motor ◽

Wide Range ◽

Static Operation ◽

A linear ultrasonic motor (LUSM) with two parallel beams and two multilayer piezoelectric actuators (MPAs) has been developed. The MPAs are aligned across the beams, and the force and displacement generated by the MPAs result in the deformation of the beams in the orthogonal direction. The LUSM has two types of operation modes: dynamic and static. In dynamic operation, the MPAs are driven by alternating voltages with a phase difference, and elliptical displacement motions are generated on the surfaces of the beams. Objects touching the surfaces of the beams can be moved in the same direction by friction. In addition, micro positioning is available over a wide range by combining dynamic and static operations. The characteristics of the LUSM include a maximum speed of 41 mm/s and a maximum thrust of 3.4 N at an operating voltage of 20 Vp-p. A movement range of approximately 8 μm has been confirmed during static operation.

Efektifitas E-Learning Dengan Aplikasi Moodle pada Mata Kuliah Penelitian Pengembangan Program Studi Teknologi Pendidikan

Jurnal Ilmiah Universitas Batanghari Jambi ◽

10.33087/jiubj.v19i1.567 ◽

2019 ◽

Vol 19 (1) ◽

pp. 114 ◽

Cited By ~ 1

Author(s):

Siti Muyaroah

Keyword(s):

Experimental Method ◽

Learning Outcomes ◽

Treatment Effect ◽

Quantitative Research ◽

Specific Treatment ◽

Student Learning Outcomes ◽

The Other ◽

Study Program ◽

E Learning ◽

This research aims to determine the effectiveness of e-learning with Moodle at educational study program, baturaja university. This research is quantitative research with experimental method. Can be interpreted as the research methods used to find a specific treatment effect against the other in a state of control. This ressearch result in the effectiveness of e-learning for student learning outcomes on science subjects. Effectiveness is the success of an establishment of a system designed to engage students actively and independently in learning. T-test result there are effectiveness of e-learning.

IMPROVING GRAMMAR SKILL USING EGRA TECHNIQUE FOR THE STUDENTS’ EIGHTH GRADE AT SMPN 5 CIMAHI

PROJECT (Professional Journal of English Education) ◽

10.22460/project.v2i3.p325-331 ◽

2019 ◽

Vol 2 (3) ◽

pp. 325

Author(s):

Mayang Kusumastuti ◽

Mega Pratiwi ◽

Hendra Husnussalam

Keyword(s):

Experimental Method ◽

Team Work ◽

Eighth Grade ◽

Average Score ◽

Test Design ◽

Teaching English ◽

English Grammar ◽

Post Test ◽

Grammar is one part to improve four skills that we also known. To enhance grammar skill we have to prefer the accurately method as a way in studying grammar. The researcher was chosen Exposure, Generalization, Reinforcement, and Application (EGRA) technique as a method to teaching English grammar to students’ eigtht grade at SMPN 5 Cimahi. It was arranged with using pre-experimental method, peculiarly one-group pre-test post-test design. The technique showed that can develop grammar skill students’. The average score of the test result is 40,83 for the pre-test and 71,70 for the post-test. From the result, it can determine that EGRA technique can improve grammar skill students’. Besides that, EGRA technique can build a good team work in the classroom.

STUDENTS’ READING ACHIEVEMENT TROUGHTHINK-ALOUD-STRATEGY

ANGLO-SAXON Jurnal Ilmiah Program Studi Pendidikan Bahasa Inggris ◽

10.33373/anglo.v7i1.1089 ◽

2016 ◽

Vol 6 (2) ◽

pp. 66

Author(s):

Albert Efendy Pohan

Keyword(s):

Reading Achievement ◽

Experimental Method ◽

Reading Ability ◽

Control Group ◽

Think Aloud ◽

Group Test ◽

Post Test ◽

The research is done in order to measure the effect of think aloud strategy toward the students’ reading achievement of eight grade students of SMPN 9 Batam. As we know, that reading ability is very needed, in order to get information as much as possible. Readers in general and also students still think aloud strategy is boring activity, especially in english. The causes are because, they feel hard to understand and get the main point from the reading passage. The method in this thesis is experimental method. The writer does some experimental to prove the influence of think aloud strategy to increase the students ability in reading. As the population, the writer takes eight grade students of SMPN 9 Batam. And as the sample, the writter takes 80 students, which is devided into two groups, 40 students as a control group and 40 students as an experiment group. There are two kinds of test, they are pre-test and post-test. After analizing the data, the writer got that there is a significant differences between the two group test result, it is proved that think aloud strategy is effective to students’ reading achievement.Keywords:Think Aloud Strategy, Reading Achievement