A prerequisite in refining volcanic hazard at explosive volcanoes is a better quantification of the timescales syn-eruptive processes, such as magma degassing and crystallization prior to eruption. To this aim, new data on matrices (microlites, residual glasses, bubbles) pumice, scoria, dense clasts erupted during AD 1530 andesitic eruption La Soufrière Guadeloupe are combined with published fr...

Introduction: Light flashes due to thermal heating and vaporization are produced during hypervelocity impact events. The shape of such a flash's light curve may be used to determine certain initial conditions of the impact. The measured flash peak intensity depends on the impact velocity and angle and varies with target and projectile type, as shown in previous studies [1,2]. Here, we examine t...

This study aims to the interaction between catfish populations and type of growing media on growth yield spinach (Amaranthus sp.) Cultivated by aquaponics system. research was conducted using an experimental method (experiment), from July August 2020 in area PUSKOPAD complex, Tanjungsari District, Sumedang Regency. at altitude 850 m above sea level. The design used Split Plot Design with basic ...

In February and March 2022, a large amount of pumice stone appeared along the shoreline Thailand. Pumice is type extrusive volcanic rock, since there are no volcanoes in Gulf Thailand, an interesting question was where stones originated from. Another whether could be vehicle for microplastics (MPs) which then journey across ocean until reaching coast A preliminary study begun, randomly collecte...

In this research, syntactic foams including Al-7075 matrix and 2-4 mm low-cost pumice particles were manufactured via a novel casting method called as sandwich infiltration. According to physical evaluations, thanks extremely porous structure of pumice, density values the fabricated varied between 1.42 1.61 g/cm3. Porosity 40.62% 47.39%. Microstructural observations showed that there was perfec...

Abstract Biofilters are effectively used for drinking water treatment. However, the long ripening time of virgin media manganese (Mn) removal is a major concern. In this study, influence flow regime on pumice medium was investigated. For purpose, pilot-scale experiments were performed to compare start-up flow-through and recirculating filter columns using inherent inoculation with same groundwa...

Discharge of nitrogen (N) with wastewater causes eutrophication in surface water. On the other hand, nutrient-rich can be valuable for agriculture. Tailoring N removal or conservation is important to meet requirements different water end uses. Improved vertical flow constructed wetlands hydroponic materials (CWH) as substrata were developed at lab scale a greenhouse and studied optimize CWH. Th...

Abstract Fire is considered one of the main risks leading to building collapse. Lightweight concrete comprises a variety components, each which has distinct behavior under effect temperature change. A total 16 mixtures were investigated in this article. reference mix comprising simply ordinary Portland cement and ten mixes having varying percentages fine coarse lightweight aggregates (pumice), ...