scholarly journals ANALISIS HAMBATAN GESEK KAPAL MODIFIKASI DARI KAPAL JARING INSANG MENJADI KAPAL PANCING TONDA DI PALABUHANRATU (Evaluation of Ship Resistance from the Modification of Gillnets Vessel Into Troll Lines Vessel in Palabuhanratu)

2020 ◽  
Vol 16 (1) ◽  
pp. 22-30
Author(s):  
Muhammad Nur Iqbal ◽  
Mohammad Imron ◽  
Fis Purwangka
Keyword(s):  
Engine Performance ◽  
Body Parts ◽  
Friction Resistance ◽  
Engine Thrust ◽  
Direct Sampling ◽  
Observation Method ◽  
Main Engine ◽  
Direct Observation Method ◽  
Resistance Value ◽  
Horse Power

Transformasi alat tangkap jaring insang ke pancing tonda adalah upaya untuk meningkatkan hasil tangkapan. Pergeseran alat tangkap ikan telah menyebabkan perubahan dalam metode penangkapan ikan, dan mempengaruhi pergerakan kapal. Saat ini nelayan memodifikasi bagian badan kapal, pemasangan mesin yang belum memasukkan standar perhitungan dalam pembangunannya. Penelitian ini bertujuan adalah untuk mengidentifikasi kemampuan mesin kapal saat beroperasi, dilihat dari hambatan gesek dan tenaga mesin kapal. Metode pengumpulan data yang digunakan dalam penelitian ini adalah accidental sampling. Data diambil menggunakan metode observasi langsung, pengukuran dimensi utama kapal, wawancara ke Nahkoda “KM Untukmu" dan studi pustaka. Data-data tersebut dianalisa dengan menggunakan metode Holtrop untuk mencari nilai hambatan gesekan kapal, metode Telfer untuk mengubah nilai resistensi menjadi nilai gaya propulsi dan metode Nomura dan Yamazaki untuk mencari nilai Brake Horse Power (BHP). Dimensi utama kapal yang diukur adalah tinggi (D), lebar (B), panjang garis air (lwl) dan draft (d). Hasil studi menyimpulkan bahwa, mesin utama “KM Untukmu” memenuhi persyaratan kecepatan yang dibutuhkan untuk melakukan operasi penangkapan ikan, yaitu 4-8 knot dan tinggi draft 1 meter dengan nilai hambatan gesek 257,96-920,64 Newton (N m/s) dan dengan nilai HP yang dibutuhkan berkisar 2,155-23,48 HP. Mesin utama “KM Untukmu" telah memenuhi kebutuhan yang diperlukan untuk melakukan operasi pancing tonda dan mampu bergerak hingga kecepatan 11,12-12,92 knot. Transforming gill nets into troll line rods is an attempt to increase the number of catches. The shift of fishing gear has caused changes in fishing methods, this has affected the ship movements. Now fishermen are modifying ship’s body parts, machinery installation, and its main engine even though they didn’t include shipping calculation standard in its construction. This study objectives are identifying ship's engine performance during fishing operation, which seen from friction resistance and ship’s engine thrust. Data collection method used is direct sampling. Data taken using direct observation method, i.e. of the ship’s main dimensions measurements, Chief of “KM Untukmu” interviews and literature studies. Data analyzed using Holtrop method in order to find ship friction resistance value, and Nomura and Yamazaki method to calculate Brake Horse Power (BHP) value. Ship main dimensions measured are depth (D), breadth (B), length of water line (lwl) and draft (d). Study shows that KM Untukmu’s main engine meets speed requirements needed to carry out fishing operations, namely 4-8 knots and one meters draft height with friction resistance value of 257.96 – 920.64 Newton (N m/s) with HP value needed around 2.15 – 23.48 HP. “KM Untukmu” main engine has fulfilled troll line operation requirements and is capable in moving up the speeds up to 11.12 – 12.92 knots.

Expérience de fréquentation des lieux publics par des personnes âgées ayant subi un TCC en présence d’un accompagnateur-citoyen: projet pilote

2016 ◽  
Vol 35 (2) ◽  
pp. 229-241 ◽  
Author(s):  
Marie-Josée Levert ◽  
Hélène Lefebvre ◽  
Isabelle Gélinas ◽  
Michelle McKerall ◽  
Odette Roy ◽  
...  
Keyword(s):  
Conceptual Framework ◽  
Elderly People ◽  
Additional Data ◽  
Pilot Project ◽  
Structured Interview ◽  
Public Places ◽  
Travel Planning ◽  
Observation Method ◽  
Direct Observation Method ◽  
Ongoing Project

ABSTRACTThis pilot project aims to test and see the relevance of the direct observation method to collect data on the barriers and facilitators to attending public places by seniors with TBI. The study is based on the conceptual framework VADA WHO which focuses on the development of friendly built and technological environments for seniors. Three elderly people participated in the study, recruited from an ongoing project, The Citizen Intervention in Community Living (APIC), in the presence of their personalized attendant. The study shows the feasibility of the method in terms of its acceptability and resources mobilized. It shows its relevance to access additional data that would have been difficult to obtain using others methods (e.g., semi-structured interview), such as the identification of the strategies used by the participants to address the obstacles encountered (avoidance, travel planning, use of physical and preventative support of the personalized attendant).

scholarly journals PENGARUH ELECTRONIC ROAD PRICING TERHADAP VOLUME LALU LINTAS PADA RUAS JALAN BLOK M – KOTA

2020 ◽  
Vol 3 (1) ◽  
pp. 39
Author(s):  
Randy Senapati ◽  
Najid Najid
Keyword(s):  
Analysis Of Variance ◽  
Direct Observation ◽  
Road Pricing ◽  
Observation Data ◽  
Traffic Situation ◽  
Questionnaire Data ◽  
Efficient Price ◽  
Light Vehicle ◽  
Observation Method ◽  
Direct Observation Method

Electronic road pricing is a prepaid road which is used to decrease the traffic volume with put on the on board unit device as the payment tool. The high number of vehicle volume at Jakarta become one of the main reason of electronic road pricing used at the traffic. On this research will be discussed about the condition of Blok M – Kota traffic situation, this road is a main access for people especially to work. to analyze the vehicle volume will be using direct observation method to get the volume, velocity and intensiveness of the traffic. Direct observation will be used to watch vehicle such as motorcycle, light vehicle and weight vehicle. With observation data we will get graphic about the connectivity between velocity and intensiveness that will be modified with questionnaire. Questionnaire data will be spreaded out to get the percentage of decreased volume and estimated price for electronic road pricing. the price and time will be processed with analysis of variance method (ANOVA) asissted with SPSS program. With this research, we expected to learn the electronic road pricing with most efficient price to decrease the vehicle volume at Blok M – Kota road. AbstrakElectronic Road Pricing adalah jalan berbayar yang digunakan untuk mengurangi volume lalu lintas dengan cara memasangkan alat On Board Unit sebagai alat pembayarannya. Tingginya volume kendaraan di Jakarta menjadi alasan utama Electronic Road Pricing digunakan pada lalu lintas. Pada penelitian ini, dibahas mengenai kondisi lalu lintas Blok M – Kota, ruas jalan ini merupakan akses pengguna jalan untuk menuju perkantoran dan tempat wisata. Untuk menganalisa volume kendaraan akan digunakan metode observasi langsung untuk mendapatkan volume, kecepatan dan kepadatan lalu lintas. Observasi langsung dilakukan dengan memperhatikan kendaraan bermotor roda dua, kendaraan ringan dan kendaraan berat. Dengan data observasi akan didapat grafik hubungan antara kecepatan dan kedapatan yang akan dimodifikasi dengan data kuesioner. Data kuesioner disebar untuk mendapatkan persentase penurunan volume dan perkiraan harga Electronic Road Pricing untuk mengurangi volume lalu lintas. Pilihan harga dan waktu akan diolah dengan metode analysis of variance (ANOVA) dengan dibantu program SPSS. Diharapkan pada analisis penelitian ini dapat mengetahui biaya Electronic Road Pricing yang paling efisien untuk mengurangi volume kendaraan pada ruas jalan Blok M – Kota.

scholarly journals Strategi dan Usaha Reservasi untuk Meningkatkan Tingkat Hunian di Grand Orchid Hotel Yogyakarta

Media Wisata ◽  
2021 ◽  
Vol 17 (1) ◽  
Author(s):  
Hery Krestanto
Keyword(s):  
Data Analysis ◽  
Direct Observation ◽  
Data Analysis Technique ◽  
Analysis Technique ◽  
Observation Method ◽  
Occupancy Rates ◽  
Direct Observation Method

This study aims to determine the strategy and reservation effort to increase occupancy rates at the Grand Orchid Hotel Yogyakarta. This research was conducted at the Grand Orchid Hotel in Yogyakarta.The type of data collected in this study is qualitative, namely the strategy and reservation effort to increase occupancy rates at the Grand Orchid Hotel Yogyakarta. The data analysis technique used is the direct observation method, direct interview. The results of the research obtained are that reservations have a very important role to increase occupancy rates and there are things that support to increase occupancy rates are complete room facilities, strategic hotel location, intensity of promotion, good employee service

scholarly journals Paremias in Modern Linguistics: Approaches to Study, Text-Forming and Linguocultural Potential

2020 ◽  
Vol 11 (2) ◽  
pp. 265-284
Author(s):  
Mikhail A. Bredis ◽  
Marianna S. Dimoglo ◽  
Olga V. Lomakina
Keyword(s):  
Modern Society ◽  
Cultural Analysis ◽  
Main Method ◽  
Cultural Methods ◽  
Social Communications ◽  
Approaches To Study ◽  
Human Thinking ◽  
Observation Method ◽  
Cultural Linguistics ◽  
Direct Observation Method

The article deals with the consideration of the paremic text in the modern linguistic paradigm: approaches to the researches are presented, the text-forming and linguocultural potential of individual units is shown. The direct observation method was used as the main method in this work, followed by the use of descriptive-analytical, comparative, contextual and linguistic and cultural methods. The Study is based on examples from lexicographic sources and illustrations from the Internet. The article provides an overview of the main aspects of the paremiological studies. Paremias are considered as a folklore genre, the thematic and ideographic principle of classifying paremias is presented, the aspects of cultural linguistics (linguoculturological) and translation studies are substantiated, and peculiarities of historical and etymological discursive (functional) analysis are shown. Comparative linguistic and cultural analysis is recognized by the authors of the paper as an integrative aspect of the paremiological material description. The article analyzes the text-forming and linguoculturological potential of the paremiology in different languages. As an example of the realization of the text-forming potential of paremias, the functioning of the proverb Не рой другому яму - сам в нее попадешь (упадешь) (He who digs a pit for others may fall himself therein) is studied as the verbal part of the Russian and Lithuanian demotivators. The paper provides a linguistic and cultural analysis of paremias with a toponymical component in different languages. Despite the abundance of various toponyms, which are characteristic for different countries, in these proverbs are dominated the international component, which is associated with the universal laws of human thinking, which makes it possible to find their semantic equivalents in various languages. The relevance of this study lies in the fact that paremias are considered in various aspects from the standpoint of modern humanistic education. With the development of social communications in modern society, an intercultural connection is being strengthened, requiring linguocultural commentary.

Entropy, Energy and Exergy for Measuring PW4000 Turbofan Sustainability

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Hakan Aygun ◽  
Onder Turan
Keyword(s):  
Thrust Force ◽  
Engine Performance ◽  
Sustainable Growth ◽  
Performance Parameters ◽  
Turbofan Engine ◽  
Effect Factor ◽  
Energy And Exergy ◽  
And Performance ◽  
Engine Components ◽  
Main Engine

Abstract This study focuses on for a PW4000 high-bypass turbofan engine using energy, exergo-sustainable and performance viewpoint. For this aim, irreversibility and performance analyses are firstly performed for five main engine components at ≈260 kN maximum take-off thrust force. Besides, overall efficiency of the turbofan is determined to be 33 %, while propulsive and thermal efficiency of the turbofan are 72 % and 46 % respectively at 0.8 M and 288.15 K flight conditions. Secondly, calculation component-based exergetic assessment is carried out using exergetic indicators. According to the calculation, the exergetic efficiency of the engine is 32 %, while its waste exergy ratio is 0.678. Furthermore, exergetic sustainability measure is obtained as 0.473, while enviromental effect factor is 2.112. These indicators are also anticipated to help comprehend the connection between engine performance parameters and worldwide dimensions such as environmental effect and sustainable growth.

An Evaluation of Relationship with Polished Stone Value and Skid Resistance Value Based on a Laboratory Investigation

2019 ◽  
Vol 801 ◽  
pp. 410-415
Author(s):  
Preda Pichayapan ◽  
Phittayoot Chaleonpan ◽  
Peerapong Jitsangiam ◽  
Pongsakorn Wongchana
Keyword(s):  
Asphalt Concrete ◽  
Skid Resistance ◽  
Test Results ◽  
Friction Resistance ◽  
Road Pavement ◽  
Main Component ◽  
Relationship Of ◽  
Resistance Value ◽  
Friction Capacity ◽  
Sandy Mudstone

Aggregates which are the main component of asphalt concrete play a major role in loading transfer and skid resistant performance of asphalt concrete. Therefore, reduction in friction resistance of aggregate would lead to a decrease in overall skid resistance of asphalt concrete which is a commonly used road pavement surface material. This research aims to evaluate relationship of aggregate friction capacity through the polished stone value and asphalt concrete skid resistance. In this study, a series of polished stone value tests on the study aggregate of limestone and sandy mudstone and British pendulum tests for skid resistance value of polished hot mix asphalt (HMA) slab. An accelerated polishing machine was used to create reduction of skid resistance of HMA slabs. Test results showed that reduction of polished stone value (PSV) of limestone 47.6% leads to a decrease of skid resistance value (SRV) approximately 43.8% of HMA slabs. Furthermore, 14.5% reduction of PSV of sandy mudstone causes a decrease of 20.3% SRV of HMA slabs. Finally, a relationship linear regression between PSV of aggregates and SRV of HMA slab was established.

A Study of External Fuel Vaporization

1981 ◽  
Author(s):  
E. J. Szetela ◽  
L. Chiappetta ◽  
C. E. Baker
Keyword(s):  
Thermal Stability ◽  
Gas Turbine ◽  
Conceptual Design ◽  
Energy Efficient ◽  
Weight Ratio ◽  
Engine Performance ◽  
Aircraft Engine ◽  
Performance Control ◽  
Engine Thrust ◽  
Fuel Vaporization

A conceptual design study was conducted to devise and evaluate techniques for the external vaporization of fuel for use in an aircraft gas turbine with characteristics similar to the Energy Efficient Engine (E3). A second purpose of the study was to select the most favorable fuel vaporization concept. In the study, three candidate concepts were analyzed from the standpoint of fuel thermal stability, integration of the vaporizer system into the aircraft engine, engine and vaporizer dynamic response, startup and altitude restart, engine performance, control requirements, safety, and maintenance. The results of the study indicate that an external vaporization system can be devised for an E3 -type engine with hardware of reasonable size. The hardware can be packaged without increasing the total engine volume and the system is not unduly complex. The selected concept offers potential gains in engine performance in terms of reduced specific fuel consumption and improved engine thrust/weight ratio. The thrust/weight improvement can be traded against vaporization system weight. However, the vaporizer is subject to fouling with deposits formed at the walls exposed to heated fuel.

scholarly journals Thrust Vector Control of an Upper-Stage Rocket with Multiple Propellant Slosh Modes

2012 ◽  
Vol 2012 ◽  
pp. 1-18 ◽  
Author(s):  
Jaime Rubio Hervas ◽  
Mahmut Reyhanoglu
Keyword(s):  
Vector Control ◽  
Center Of Mass ◽  
Nonlinear Feedback ◽  
Thrust Vector Control ◽  
Engine Thrust ◽  
Mass Spring Model ◽  
Upper Stage ◽  
Thrust Vector ◽  
Mass Spring ◽  
Main Engine

The thrust vector control problem for an upper-stage rocket with propellant slosh dynamics is considered. The control inputs are defined by the gimbal deflection angle of a main engine and a pitching moment about the center of mass of the spacecraft. The rocket acceleration due to the main engine thrust is assumed to be large enough so that surface tension forces do not significantly affect the propellant motion during main engine burns. A multi-mass-spring model of the sloshing fuel is introduced to represent the prominent sloshing modes. A nonlinear feedback controller is designed to control the translational velocity vector and the attitude of the spacecraft, while suppressing the sloshing modes. The effectiveness of the controller is illustrated through a simulation example.

scholarly journals Distribution characteristics of insect diversity in long-term fixed monitoring plots in Northeast China

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0250689
Author(s):  
Jinwen Liu ◽  
Xiujuan Yan ◽  
Xinyuan Song ◽  
Jiamei Zhang ◽  
Donghui Wu ◽  
...  
Keyword(s):  
Northeast China ◽  
Black Soil ◽  
Insect Community ◽  
Insect Communities ◽  
Ecological Processes ◽  
Structure Changes ◽  
Biodiversity Maintenance ◽  
Observation Method ◽  
Direct Observation Method

The spatial patterns of field arthropod communities are an essential part of ecology and can provide fundamental data regarding field ecological processes and reveal the mechanism of ecosystem biodiversity maintenance. This study investigated the spatial distribution pattern of field insect communities to detect the spatial relationships between insect communities in farmland. The study site was located at the Dehui Agro-ecological Experimental Station of Black Soil, Jilin, China. Insect communities and environmental factors were sampled at 121 uniformly distributed points in a 400 × 400 m plot in August, September, and October 2015. The analysis revealed that insect communities from June to October demonstrated significant spatial correlation, and 6085 samples of 47 species and 47 families in 11 orders were collected from the insect community in the farmland. The farmland insect community structure changes and dynamic changes of nutritional function groups occur with time. According to the 400 x 400 m plot, the diversity of farmland insect communities and functional groups is maintained at a relatively high and stable level. In this study, a total of 6085 samples of corn farmland insects were obtained using the fluke method and direct observation method, including 11 orders, 26 families and 47 species, 4 absolute dominant populations, 6 main dominant populations, and 37 other populations. These studies can provide help for pest control in the spring corn area of Northeast China.

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