Study on the Earth Pressure during Sinking Stage of Super Large Caisson Foundation

End resistance is a dominant variable in the sinking process of super-sized caisson foundation, which is of great importance to the safe sinking of the caisson foundation. Based on soil excavation process of super large caisson foundation of the main tower of Changtai Yangtze River Bridge, the distribution characteristics and variation of earth pressure under the foot blade was analyzed using 3D finite element method at the first stage of soil excavation. Furthermore, the earth pressure was monitored in real time during soil excavation in order to analyze the influence of soil excavation process on the distribution of earth pressure. The analysis results of engineering practice showed that in the process of soil excavation from inner area to outer area, the end resistance of inner bulkhead and inner partition walls decreased, while the end resistance of outer bulkhead and outer partition walls gradually increased till the soil reached the failure state in the outer bulkhead area. The distribution characteristics and variation of the earth pressure can really reflect overall stress state of caisson foundation, which helps guide the safe sinking by soil excavation.

Implementation of simple additive weighting methods and non-linier trend methods in mapping of flood protected areas: A case study sub-DAS Bengkulu Hilir

This research aims to build a geographic information system that can map the level of flood-prone areas around Sub-DAS Bengkulu. To determine the flood prone areas are used four (4) parameters i.e. riverbank, high ground class, rainfall and settlement using Simple Additive Weighting method and using Trend Non Linier forecasting method. The resulting outer area of the flood map is calculated from The Simple Additive weightingmethod. For five (5) years, from 2014 – 2018 there are 267 data entering intermediate clustering , 477 of data entering low clustering and the latter there are 35 data that enters high clustering . In addition, there is also an external result of prediction Chart of the highest Trend Non Linier in 2021 of 2.3809, in 2022 for 3.14841, in 2023 for 4.04413, in 2024 for 5.06803, and in 2025 for 6.22014.

Forced Fold Amplitude and Sill Thickness Constrained by Wireline and 3-D Seismic Data Suggest an Elastic Magma-Induced Deformation in Tarim Basin, NW China

Disparities between fold amplitude (A) and intrusion thickness (Hsill) are critical in identifying elastic or inelastic deformation in a forced fold. However, accurate measurements of these two parameters are challenging because of the limit in separability and detectability of the seismic data. We combined wireline data and 3-D seismic data from the TZ-47 exploring area in the Tarim Basin, Northwest China, to accurately constrain the fold amplitude and total thickness of sills that induced roof uplift in the terrain. Results from the measurement show that the forced fold amplitude is 155.0 m. After decompaction, the original forced fold amplitude in the area penetrated by the well T47 ranged from 159.9 to 225.8 m, which overlaps the total thickness of the stack of sills recovered by seismic method (171.4 m) and well log method (181.0 m). Therefore, the fold amplitude at T47 area is likely to be elastic. In contrast, the outer area of the TZ-47 forced fold is characterized by shear-style deformation, indicating inelastic deformation at the marginal area. It is suggested that interbedded limestone layers would play an important role in strengthening the roof layers, preventing inelastic deformation during the emplacement of intrusive magma.

Persepsi Pengunjung Domestik Terhadap Wisata Entertainment di Daya Tarik Wisata Kawasan Luar Pura Uluwatu

The strategy forming tourist attraction to attract repeating guest is by developing entertainment tourism which offers sense of pleasure, satisfaction, and valuable experience. Uluwatu Kecak Fire Dance in Outer Area Uluwatu Temple was recognized as the most famous entertainment forms by domestic visitors. This aim of study is to identifying characteristics and measuring perception of domestic visitors to Uluwatu Kecak Fire Dance based on seven operational dimensions of entertainment tourism (Learning, Enjoyment, Escape, Refreshment, Novelty, Involvement, and Local Culture). The research used qualitative method with data collection techniques are questionnaire (number of samples were 65 respondents) and literature study. The data analysis technique used descriptive statistical analysis with continuum lines. The results showed that the perception of 65 domestic visitors for entertainment tourism in Uluwatu Temple were strongly agreed on Learning (277.5) and Enjoyment (285). While perception that were agreed are Escape (227), Refreshment (248.5), Novelty (259.25), Involvement (266), and Local Culture (272.33). In determining the dominant indicators of each dimension of entertainment tourism, the author uses the highest frequency capacity value. The three dimensions with highest average value are Enjoyment (285), Learning (277.5), and Local Culture (272.33). The administrator Outer Area Uluwatu Temple emphasize strategies that can maintain the three dimensions of entertainment tourism that have a dominant value, which is the Enjoyment dimension, Learning dimension, and the Local Culture dimension. Keyword: Visitor Perception, Socio-demographic Characteristics, Entertainment Tourism, Domestic Visitors

Molecular dynamics simulations of the alloying process of Cu/Au nanoparticles with different sizes

The coalescence of particles extensively exists in the industrial production and nature, which is of great research significance. This paper examined the alloying process of Cu/Au nanoparticles with different sizes by molecular dynamics (MDs) simulations. The coalescence process presents three stages which can be divided by the contact and fusion. The alloying processes of Cu/Au nanoparticles with different sizes had contacted with each other before the heating at 300 K. The Au atoms diffused through the outer area of the sintering neck before the nanoparticles were fused into one particle. The coalescence had become severe after the systems reached the melting temperature. The different systems showed different sintering rate.

Comparative Analysis of Laser and Plasma Surfacing by Nickel-Based Superalloy of Heat Resistant Steel

In this article, the results of surfacing technology development, and structural, and mechanical properties examinations of 16Mo3 steel pipes with an outside coating of Inconel 625 deposited by automated plasma powder transferred arc (PPTA) and automated high power direct diode laser (HPDDL) surfacing were presented. Based on the results of non-destructive, metallographical macro- and microscopic, chemical composition, and thickness and hardness examinations optimal technology for use in high temperature energy or chemical industry applications was selected. The examinations conducted for each of the aforementioned technologies revealed the proper structure and high quality of coating. Dendritic structure with primary crystals growing in the direction of heat dissipation was revealed. No defects such as cracks, lack of fusion or porosity were found. Iron content in the most outer area of the layer made by PPTA with a heat input of 277–514 J/mm, thickness from 1.2 to 1.7 mm, between 4% and 5.5% was observed. Iron content in the most outer area of the layer made by HPDDL surfacing with output power of 1000–1600 W and scanning speed 3.3–4.7mm/s, from 0.6 to 1.3 mm in thickness, between 5.1% and 7.5% was observed. In coated pipes made by either technology high quality of surfaced layers, conforming to requirements posed on protective layers manufactured for prolonged exploitation in temperatures up to 625 °C, were observed. High temperature resistance examinations are the focus of further, yet unpublished, research. The obtained results point to slight differences in the parameters and properties of nickel-based superalloy layers surfaced on 16Mo3 pipes based on the technologies used. However, the process parameters optimization in the case of PPTA was simpler compared to HPDDL surfacing.

Pengaruh Liang Boleophthalmus pectinirostris (Linnaeus, 1758) (Actinopterygii:Gobiidae) terhadap Biomassa Mikrofitobenthos di Ekosistem Mangrove Pandansari Brebes Jawa Tengah

Mudskippers (Boleophthalmus pectinirostris) in temperate climates make burrows and shallow ponds surrounded by mud walls as a provider of microhabitats for microphytobenthos. In the mangrove ecosystem of Pandansari Brebes there are also Boleophthalmus pectinirostris which make burrows. The purpose of this study is to determine the effect of the Boleophthalmus pectinirostris burrow as a microhabitat for microphytobenthos in the mangrove ecosystem of Pandansari, Kaliwlingi village, Brebes. This research was conducted in mangrove and mudflat beach areas with three transects and three replications each. Samples were taken were burrow structures, temperature, and microphytobenthos biomass in the inner and outer area of the burrow. The results showed a total area of burrows in mudflat beach areas 71.93 ± 24.9cm2/m2 was greater than in mangrove areas 50.51 ± 46.9cm2/m2 because the beach has more mud than in mangrove. Microphytobenthos biomass was fewer in mudflat beach areas than mangrove areas because the density of Boleophthalmus pectinirostris was more on the mudflat. There was no difference in microphytobenthos biomass inside the burrow (mangrove: 1623 ± 1108µg/mm2; mudflat beach: 94.5 ± 67.5µg/mm2) from outside the burrow (mangrove: 2484 ± 3161µg/mm2; mudflat beach: 145 ± 151µg/mm2). This shows that the Boleophthalmus pectinirostris burrow in Pandansari Brebes does not provide microhabitats for microphytobenthos. This is because in the tropics the temperature is almost the same every year so that microphytobenthos can always live every year. Ikan gelodok (Boleophthalmus pectinirostris) di daerah beriklim temperate membuat liang dan juga kolam dangkal yang di kelilingi oleh dinding lumpur sebagai penyedia mikrohabitat bagi mikrofitobenthos. Di ekosistem mangrove Pandansari Brebes juga terdapat B. pectinirostris yang membuat liang. Tujuan penelitian ini mengetahui pengaruh liang ikan gelodok jenis B. pectinirostris sebagai mikrohabitat bagi mikrofitobenthos di ekosistem mangrove daerah Pandansari desa Kaliwlingi Brebes. Penelitian ini dilakukan di daerah mangrove dan daerah pantai berlumpur dengan masing tiga transek dan tiga ulangan. Sampel yang diambil berupa struktur liang, suhu dan biomassa mikrofitobenthos di area dalam dan luar liang. Hasil menunjukan luas liang total lebih besar di daerah pantai 71,93±24,9 cm2/m2 karena pantai memiliki lumpur yang banyak daripada di daerah mangrove 50,51±46,9cm2/m2. Biomassa mikrofitobenthos lebih sedikit di daerah pantai daripada daerah mangrove karena kepadatan B. pectinirostris lebih banyak di pantai. Tidak ada perbedaan biomassa mikrofitobenthos secara signifikan di dalam liang (mangrove: 1623±1108µg/mm2; pantai: 94,5±67,5µg/mm2) dengan di luar liang (mangrove: 2484±3161µg/mm2; pantai:145±151µg/mm2) hal ini menunjukan liang B. pectinirostris di Pandansari Brebes tidak menyediakan mikrohabitat bagi mikrofitobenthos. Hal ini disebabkan di daerah tropis suhu tiap tahun yang hampir sama sehingga mikrofitobenthos dapat selalu hidup tiap tahun

Molecular dynamics simulation of sintering of Cu and Au nanoparticles

Particle coalescence has wide applications in nature and industry. In this study, molecular dynamics (MDs) simulations were employed to examine the sintering of Cu and Au nanoparticles, as well as two other systems, namely, Cu nanoparticles and Au nanoparticles. The results suggested that, the Au atoms diffused through the outer area of the sintering neck before the nanoparticles were fused into one sphere. The possible reason was that the Au atoms resembled fluid, which could be ascribed to the local thermal energy at the contact area. Typically, the change in energy per atom from 300 K to the contact temperature denoted that less energy was required for the atoms in the pure Cu system to contact with each other than those in the other two systems.