Estimation of shallow soil structure by microtremor miniature array observation method

2019 ◽  
Author(s):  
He Ma ◽  
Takahisa Enomoto ◽  
Tetsushi Inubushi ◽  
Shigeki Senna
Keyword(s):  
Soil Structure ◽  
Shallow Soil ◽  
Observation Method

Soil Structure and Its Relationship to Shallow Soil Subsidence in Coastal Wetlands

2019 ◽  
Vol 42 (8) ◽  
pp. 2114-2123 ◽  
Author(s):  
Yanmei Xiong ◽  
Anne Ola ◽  
Sang Minh Phan ◽  
Jingtao Wu ◽  
Catherine E. Lovelock
Keyword(s):  
Coastal Wetlands ◽  
Soil Structure ◽  
Soil Subsidence ◽  
Shallow Soil

Observed changes in shallow soil temperatures in Northeast China, 1960-2007

2016 ◽  
Vol 67 (1) ◽  
pp. 31-42 ◽  
Author(s):  
Y Liu ◽  
L Wang ◽  
B Liu ◽  
M Henderson
Keyword(s):  
Northeast China ◽  
Shallow Soil ◽  
Soil Temperatures

An Experimental Investigation on Thermal Conductivity and Viscosity of Graphene doped CNTs /TiO2 Nanofluid

2020 ◽  
Vol 17 (3) ◽  
Author(s):  
A.M. Zetty Akhtar ◽  
M.M. Rahman ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Thermal Conductivity ◽  
Zeta Potential ◽  
Base Fluid ◽  
Minimum Quantity Lubrication ◽  
Cutting Fluid ◽  
Cutting Zone ◽  
Observation Method ◽  
The Stability ◽  
The Relationship ◽  
Zeta Potential Analysis

This paper presents the findings of the stability, thermal conductivity and viscosity of CNTs (doped with 10 wt% graphene)- TiO2 hybrid nanofluids under various concentrations. While the usage of cutting fluid in machining operation is necessary for removing the heat generated at the cutting zone, the excessive use of it could lead to environmental and health issue to the operators. Therefore, the minimum quantity lubrication (MQL) to replace the conventional flooding was introduced. The MQL method minimises the usage of cutting fluid as a step to achieve a cleaner environment and sustainable machining. However, the low thermal conductivity of the base fluid in the MQL system caused the insufficient removal of heat generated in the cutting zone. Addition of nanoparticles to the base fluid was then introduced to enhance the performance of cutting fluids. The ethylene glycol used as the base fluid, titanium dioxide (TiO2) and carbon nanotubes (CNTs) nanoparticle mixed to produce nanofluids with concentrations of 0.02 to 0.1 wt.% with an interval of 0.02 wt%. The mixing ratio of TiO2: CNTs was 90:10 and ratio of SDBS (surfactant): CNTs was 10:1. The stability of nanofluid checked using observation method and zeta potential analysis. The thermal conductivity and viscosity of suspension were measured at a temperature range between 30˚C to 70˚C (with increment of 10˚C) to determine the relationship between concentration and temperature on nanofluid’s thermal physical properties. Based on the results obtained, zeta potential value for nanofluid range from -50 to -70 mV indicates a good stability of the suspension. Thermal conductivity of nanofluid increases as an increase of temperature and enhancement ratio is within the range of 1.51 to 4.53 compared to the base fluid. Meanwhile, the viscosity of nanofluid shows decrements with an increase of the temperature remarks significant advantage in pumping power. The developed nanofluid in this study found to be stable with enhanced thermal conductivity and decrease in viscosity, which at once make it possible to be use as nanolubricant in machining operation.

PEMBELAJARAN MENULIS TEKS EKSPOSISI BERBASIS E-LEARNING DALAM MENINGKATKAN PRESTASI BELAJAR

2020 ◽  
Vol 9 (1) ◽  
pp. 57-67
Author(s):  
I Kadek Darmadi Adiyasa ◽  
I Made Sutama ◽  
Ida Bagus Putrayasa
Keyword(s):  
Student Achievement ◽  
Test Method ◽  
Student Responses ◽  
Average Value ◽  
Basic Competency ◽  
Improve Student Achievement ◽  
Student Achievements ◽  
E Learning ◽  
Observation Method ◽  
Questionnaire Method

The classroom action research conducted at class X IPB1 in SMA Negeri 1 Susut aimed to (1) To describe the steps in implementing e-Learning based learning in writing the exposition text of class X IPB1 at SMA Negeri 1 Susut. (2) Describe student achievements after implementing e-Learning in exposition text of class X IPB1 in SMA Negeri 1 Susut, and (3) Describe student responses after applying e-learning in writing text exposition of class X IPB1 in SMA Negeri 1 Susut. This research was conducted in two cycles in which consisted of five stages, namely: planning, implementing, observing, evaluating, and reflecting. Data were collected by observation method, interview method, test method, questionnaire method and analyzed descriptively quantitative and qualitative. The results showed the average value of the first cycle was 72.6 or an increase of 17.05% from the previous value (pre-cycle) 37. The value of the second cycle was 81.1 or an increase of 43.4%. The acquisition of the average response of students in the first cycle of 33.7% in the very positive category and increased in the second cycle of student responses to 33.96 in the very positive category. The conclusions in this study were (1) learning steps based on e-Learning based on basic competency standards and according to procedures that have been designed. (2) e-Learning can improve student achievement in writing exposition texts. (3) students' responses to e-Learning are very positive. The suggestion of this research is that teachers should use e-learning to improve student achievement.

Kesalahan Penggunaan Bahasa Perancis dalam Tulisan Mahasiswa Program Studi Sastra Perancis Unpad

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 368
Author(s):  
Gilang Januarsyah
Keyword(s):  
General Public ◽  
Qualitative Approach ◽  
French Language ◽  
Analysis Method ◽  
Writing Skill ◽  
Language Writing ◽  
The Difference ◽  
Observation Method ◽  
Bahasa Indonesia

ABSTRAKUntuk menghasilkan sebuah karangan berbahasa Perancis yang dapat dipahamioleh khalayak umum, mahasiswa harus menguasai kemampuan berbahasa Perancis ragamtulis yang baik dan benar sesuai dengan kaidah yang berlaku. Penelitian ini bertujuanuntuk menjelaskan kesalahan sintaksis yang dilakukan oleh mahasiswa Program StudiSastra Perancis Universitas Padjadjaran. Data yang digunakan dalam penelitian ini diambildari sepuluh karangan mahasiwa yang duduk di semester lima dan tujuh dan dianalisisdengan menggunakan metode simak dan metode analisis padan referensial translasionaldengan pendekatan kualitatif. Hasil dari penelitian ini menunjukkan bahwa kesalahantertinggi yang dilakukan mahasiswa adalah kesalahan dalam penggunaan passé composédan imparfait sebesar 50%, kemudian diikuti oleh kesalahan dalam penggunaan pronomrelatif simple et composé ‘pronomina penghubung bebas dan turunan’ sebesar 30%, danterakhir kesalahan dalam penggunaan pronom COD et COI ‘pronomina COD dan COI’ sebesar20%. Faktor yang menyebabkan terjadinya kesalahan tersebut adalah faktor linguistikyang disebabkan oleh perbedaan kaidah tatabahasa bahasa Indonesia dan Perancis.Selain itu terdapat pula faktor sosiolinguistik yang disebabkan oleh jarangnya mahasiswamembiasakan diri mereka untuk mengaplikasikan bahasa Perancis di luar kelas.Kata kunci: kesalahan, sintaksis, bahasa Perancis, tulis, pengajaranABST RACTTo produce a French-language essay that can be understood by the general public,the students should master the ability of French language in good and true writing skill inaccordance with the applicable rules. The aim of this research is to explain the syntactic errorsmade by students of French literature’s program at University Padjadjaran. The sources ofdata are taken from the ten student essays who sit in the fifth and seventh semesters, and themethods used in this research are Observation Method ‘Metode Simak’ and the analyticalreference translational analysis method with a qualitative approach. The results of thisresearch indicate that the highest errors that students make are the use of passé composéand imparfait as much as fifty percent, followed by errors in the use of pronom relatifsimple et composé ‘the free and derivative pronouns’ thirty percent, and the last error is inthe use of pronom CO D et CO I ‘‘The COD and COI pronouns’ twenty percent. The factors thatcause those errors are a linguistic caused by the difference rules of Indonesian and Frenchgrammar. In addition there are also sociolinguistic factors caused by the rarity of studentsfamiliarize themselves to apply the French language outside the classroom.Keywords: Error, syntax, French language, writing, teaching

SOIL STRUCTURE AND WATER-STABLE AGGREGATES

2013 ◽  
Vol 12 (4) ◽  
pp. 741-746 ◽  
Author(s):  
Florian Statescu ◽  
Dorin Cotiusca Zauca ◽  
Lucian Vasile Pavel
Keyword(s):  
Soil Structure ◽  
Water Stable Aggregates
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