Soil Liquefaction Remediation of the Port of San Diego's B Street Pier Facility Using Deep Soil Mixing

The Port of San Diego's B Street Pier facility (Pier) is the busiest cruise terminal in the City of San Diego with over a hundred ship calls annually (pre-COVID). The Pier is an approximately 9.4-acre bulkhead faced mole extending about 1,000 ft into San Diego Bay and approximately 400 ft wide. On the three offshore sides of the bulkheaded mole are marginal pile supported wharfs constructed in 1923. The upland side of the mole is a concrete gravity seawall constructed in 1900. The mole soils consist of hydraulically placed dredge spoils and are susceptible to liquefaction.The existing Pier containment walls are deemed inadequate for seismic loading, mainly due to the presence of liquefiable materials both in front of and behind the existing containment wall. A solution consisting of an improved Deep Soil Mixing (DSM) zone coupled with the installation of a new steel sheet bulkhead was selected to retrofit and upgrade the Pier to current seismic standards. A key aspect of the design was to minimize loading induced from the wharf onto the existing curtain wall during an earthquake. The DSM zone is intended to serve a triple purpose, that is to improve shear strength of the soils behind the curtain wall, to mitigate the impact of liquefaction, and to provide sufficient bearing for potential future lightly loaded structures which may be constructed on the Pier. To obtain a cost-effective design and limit the DSM zone extents, the design also needed to limit the seismic load contributions to the DSM from the marginal wharves during seismic conditions. A development plan consisting of a multi-phased construction plan was determined to meet the Port's capital improvement needs and budget. Phase I development will install the DSM zone and steel sheet pile bulkhead along the south and west face of the mole. Future work will include wharf pile and deck replacement along with completing curtain wall replacement along the north face of the mole. This paper presents the geotechnical design challenges and considerations associated with the design of the DSM and sheet pile system comprising Phase I of the development plan. Key aspects of the geotechnical design included the selection of appropriate liquefaction resistance of the DSM improved zone, designing for the lateral spread of the slope in front of the curtain wall, assessment of stability and deformation of the proposed sheet pile, and the determination of the seismic earth pressures. © ASCE.

Chunk Learning Media for Cognitive Load Optimization on Science Learning

The sudden shift in the education world due to the pandemic of Covid-19 bring both challenge and opportunity at the same time. Since decades ago, the understanding of the importance to manage cognitive load for effective learning had been applied in multiple methods. Having said that, only a few addresses the opportunity to combine it with the latest trend attractive for today's young learners to minimize more extraneous cognitive load. This research discusses the matter by proposing the adoption of the combination of chunk learning, animation, and super short video in social media platforms to convey learning materials on nervous system science, which has been stamped as a hard subject for high school students. The adaptation of super short video animation on nervous system science successfully helps students cope with the daunting pile of materials align with the cognitive load theory. © 2022 IEEE.

Automatic Charging System for Disinfection Robots Based on Structure-Aware Semantic Mapping

Disinfection robots, which replace human efforts to disinfect the environment, are becoming popular due to the ongoing impact of COVID-19. To address the existing problems of imperfect and costly automatic charging systems for disinfection robots, this paper designs an automatic charging system for disinfection robots based on structure-Aware semantic mapping, which optimizes the automatic charging scheme for robots and integrates LIDAR and infrared modules to achieve the goal. Firstly, the data is associated with the charging pile's priori information through structure perception, and the identified semantic information is mapped into the local map of the robot SLAM. Then the infrared module is used to adjust the position of the charging port to align with the charging pile, and TOF laser distance measuring function is also added to avoid damage to the charging pile from the disinfection robot. In 50 times of simulation experiments, our proposed automatic charging system achieves an accurate alignment rate of 96%. © 2022 IEEE.

Determination of the Distribution Center Location of the Batam City Garbage Bank using Gravity method

Cleanliness is the most important thing. Especially in the conditions of the COVID-19 pandemic that hit almost all parts of Indonesia. But in reality, the problem of garbage accumulation is always present from year to year, and until now it has not been resolved. Batam City Government also has concern for waste banks so that the government has facilitated waste banks so that inorganic waste can be reused and no buildup causes unwanted impacts from piles of garbage. Currently, the points of accumulation of inorganic waste are not balanced, there are locations where there are too many landfills and some are mediocre due to ineffective location placement. So it is necessary to determine the best location in determining the distribution location of the waste bank. To overcome this, the researchers tried to find a way to find the right location using the gravity method seen from the coordinates via Google Maps in an area based on the address of the waste bank and the number of piles of garbage. The results of the study stated that the center of the waste bank should be in the area around the coordinates of 1°02'70.4"N 103°96'15.0"E, Sekupang District. © 2021 IEEE.

Fisherman Community Development Model with Disaster Mitigation Perspective in Meranti Islands Regency

Meranti Islands Regency has coastal natural resources. On the other hand, this area also has the potential for natural disasters (coastal) and non-natural disasters that threaten the sustainability of resources and community welfare, so disaster mitigation efforts are needed. This study aims to formulate a model for developing Fisherman communities with a disaster mitigation perspective. This study uses MPE analysis and prospective analysis. The strategic basis for developing fisherman communities is increasing food security through the developing coastal based green industries, capacity building for local competitiveness and conservation of endemic species, and allocating budget proportionally to create local-based economic infrastructure and facilities development. The potential natural disasters that are more dominant in Meranti Islands Regency are abrasion, landslides, high waves and tidal flooding. A non-natural disaster is Covid-19 pandemic. Mitigation must be done is planting mangroves, building sheet piles, social engineering policies must be done by planting mangroves, building sheet piles, social engineering policies, and planting mangroves, building sheet piles, social engineering policies, and alternative livelihoods. The model for developing Fisherman communities with a disaster mitigation perspective in Meranti Islands Regency is optimizing coastal areas’ productivity and livelihood support systems.