scholarly journals Daya Dukung Tanah Pasir Dengan Perkuatan Geotekstil Tipe UW 150 Terhadap Variasi Lebar Fondasi dan Perkuatan

2021 ◽  
pp. 99-106
Author(s):  
Martini Martini ◽  
V.I. Cristina
Keyword(s):  
Hydraulic Jack ◽  
Intersection Method

Tanah pasir adalah tanah yang memiliki daya dukung yang rendah serta lebih dipengaruhi oleh kepadatan tanah. Oleh sebab itu perlu dilakukan perbaikan tanah pasir untuk dapat meningkatkan daya dukung tanah pasir. Salah satu metode perbaikan tanah secara mekanis yaitu dengan menyisipkan lembar perkuatan (geotekstil) pada tanah pasir tersebut. Tujuan dari penelitian ini adalah mengkaji hubungan lebar fondasi (B) dan lebar perkuatan (Br) dalam meningkatkan daya dukung tanah berpasir serta mengetahui daya dukung tanah pasir pada kondisi tanpa dan dengan perkuatan. Penelitian ini bertujuan untuk mengetahui pemodelan pada tanah pasir dalam bak uji yang terbuat dari plat baja berukuran 80 cm x 80 cm dengan model pondasi dangkal berukuran 8 cm x 8 cm, 10 cm x 10 cm dan 12 cm x 12 cm. Pembebanan diberikan dengan menggunakan alat hydraulic jack. Tanah dibentuk dengan kerapatan relatif 50% dan lebar perkuatan (Br) yang disisipkan berukuran 4B, 5B dan 6B dengan kedalaman (u) 0,5B, spasi(z) 0,25B dan jumlah perkuatan(N) 3 lembar, dimana B adalah lebar pondasi. Selanjutnya, ditentukan daya dukung batas dan rasio daya dukungnya (BCR). Hasil penelitian memperlihatkan bahwa pemberian lembar geotekstil dapat meningkatkan daya dukung pada tanah pasir terhadap kondisi tanpa perkuatan. Daya dukung semakin meningkat bila lebar pondasi (B) semakin besar serta lebar perkuatan (Br) atau geotekstil semakin besar. Daya dukung terbesar berdasarkan teori Tangent Intersection Method diperoleh pada lebar pondasi (B) 12 cm x 12 cm dan lebar perkuatan (Br) 6B sebesar 153 kN/m2 dengan rasio daya dukung sebesar 2,06. Untuk teori vesic daya dukung terbesar diperoleh pada lebar pondasi (B) 12 cm x 12 cm 274 kN/ m2 untuk lebar perkuatan 6B dengan rasio daya dukung (BCR) sebesar 3,32.

Intra-scan intersection method for the determination of pointing biases of an airborne altimeter

2016 ◽  
Vol 37 (3) ◽  
pp. 648-668 ◽  
Author(s):  
Robert Harpold ◽  
James Yungel ◽  
Matthew Linkswiler ◽  
Michael Studinger
Keyword(s):  
Intersection Method

scholarly journals Message Integration Authentication in the Internet-of-Things via Lattice-Based Batch Signatures

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 4056 ◽  
Author(s):  
Xiuhua Lu ◽  
Wei Yin ◽  
Qiaoyan Wen ◽  
Kaitai Liang ◽  
Liqun Chen ◽  
...  
Keyword(s):  
Internet Of Things ◽  
Processing Speed ◽  
Quantum Computer ◽  
The Internet ◽  
Small Integer ◽  
Computer Attacks ◽  
Intersection Method ◽  
Small Integer Solution Problem ◽  
The Internet Of Things ◽  
Batch Signature

The internet-of-things (also known as IoT) connects a large number of information-sensing devices to the Internet to collect all kinds of information needed in real time. The reliability of the source of a large number of accessed information tests the processing speed of signatures. Batch signature allows a signer to sign a group of messages at one time, and signatures’ verification can be completed individually and independently. Therefore, batch signature is suitable for data integration authentication in IoT. An outstanding advantage of batch signature is that a signer is able to sign as many messages as possible at one time without worrying about the size of signed messages. To reduce complexity yielded by multiple message signing, a binary tree is usually leveraged in the construction of batch signature. However, this structure requires a batch residue, making the size of a batch signature (for a group of messages) even longer than the sum of single signatures. In this paper, we make use of the intersection method from lattice to propose a novel generic method for batch signature. We further combine our method with hash-and-sign paradigm and Fiat–Shamir transformation to propose new batch signature schemes. In our constructions, a batch signature does not need a batch residue, so that the size of the signature is relatively smaller. Our schemes are securely proved to be existential unforgeability against adaptive chosen message attacks under the small integer solution problem, which shows great potential resisting quantum computer attacks.

Non-cooperative maritime target position and velocity measuring method based on monocular trajectory intersection for video satellite

2017 ◽  
Vol 233 (1) ◽  
pp. 44-56 ◽  
Author(s):  
Shengyi Chen ◽  
Haibo Liu ◽  
Xiaochun Liu ◽  
Qifeng Yu
Keyword(s):  
Target Position ◽  
Measuring Method ◽  
Observation Time ◽  
Measuring Error ◽  
Target Movement ◽  
Practical Applications ◽  
High Measurement ◽  
Velocity Measuring ◽  
Elevation Model ◽  
Intersection Method

This paper presents a passive measuring method based on monocular trajectory intersection, aimed at realizing the position and velocity measurement of a non-cooperative maritime target for video satellite. Due to the fact that the target’s moving range is relatively small in comparison to that of the satellite during the observation time, a large measuring error results when directly using the monocular trajectory intersection method for 3D motion measurement. Therefore, the dynamic sea surface elevation model is employed to increase the maritime target movement constraints, which simplifies the 3D spatial motion of the target to 2D surface motion. By combining the surface constraint and monocular trajectory intersection method, measurement robustness for a non-cooperative maritime target can be greatly improved. Furthermore, a line-surface intersection method is proposed to obtain the initial solution for motion parameters, which increases the nonlinear optimization efficiency. Simulation experiments are conducted to analyze the effect of different error factors on position and velocity accuracy. The results indicate that the proposed method achieves high measurement accuracy and is feasible in practical applications for video satellite.

scholarly journals USED TIRE AS BASE ISOLATOR TIRE FOR EARTHQUAKE RESISTANT HOUSES

2011 ◽  
Vol 7 (1) ◽  
pp. 37
Author(s):  
Inggemar Särfors
Keyword(s):  
Base Isolation ◽  
Load Ratio ◽  
Earthquake Resistance ◽  
Horizontal Load ◽  
Hydraulic Jack ◽  
Earthquake Energy ◽  
Base Isolator ◽  
Earthquake Resistant ◽  
Earthquake Load ◽  
Better Than

The investigation of foundation on tires for absorbing the earthquake energy on houses structure is described here. The foundations are cut cone in shape. There are two tests have been conducted to investigate the shaking energy absorption. First, the foundation is placed on the sand filled tire. The second one, the double tires support round foundation. For comparison purpose, the foundation on sand test without tire is also conducted. The laboratory tests are performed using double hydraulic jack to generate the applied loads. The first jack is used to give the vertical load on the top of foundation to simulate the house load. The other jack is used to produce the load in the horizontal direction to replicate the earthquake load. The results of the tests are plotted in the terms of horizontal load and displacement corves. The double tires foundation shows the higher horizontal displacement-load ratio compared to the others. It indicates that the double tire based foundation absorbing the earthquake energy better than the others. It is concluded that the tired based foundation can be installed to support in the earthquake resistant houses. Keywords: foundation, earthquake resistance, base isolation

Automatic ray–surface intersection method

1982 ◽  
Vol 21 (12) ◽  
pp. 2184 ◽  
Author(s):  
B. J. Howell ◽  
M. E. Wilson
Keyword(s):  
Surface Intersection ◽  
Intersection Method
Sign in / Sign up

Export Citation Format

Share Document