Search results for "akut"
showing 6 items of 36 documents
Efficiency of temporal sensor data compression methods to reduce LoRa-based sensor node energy consumption
2022
Purpose Minimizing the energy consumption in a wireless sensor node is important for lengthening the lifetime of a battery. Radio transmission is the most energy-consuming task in a wireless sensor node, and by compressing the sensor data in the online mode, it is possible to reduce the number of transmission periods. This study aims to demonstrate that temporal compression methods present an effective method for lengthening the lifetime of a battery-powered wireless sensor node. Design/methodology/approach In this study, the energy consumption of LoRa-based sensor node was evaluated and measured. The experiments were conducted with different LoRaWAN data rate parameters, with and without …
Dry chlorination of spent nickel metal hydride battery waste for water leaching of battery metals and rare earth elements
2022
An efficient leaching process was developed for nickel, cobalt, and the rare earth elements (REEs) from spent nickel metal hydride (NiMH) battery waste. The process involves dry chlorination with ammonium chloride in low temperature to produce water-soluble chlorinated compounds, followed by simple water leaching. The factors affecting the conversion and solubilization were studied, including the amount of ammonium chloride, residence time and temperature in dry chlorination, and solid to liquid ratio, time and temperature in water leaching. As a result, the dry chlorination process was found to produce ammonium and chloride containing products, depending on the temperature of the process: …
Considering lithium-ion battery 3D-printing via thermoplastic material extrusion and polymer powder bed fusion
2021
In this paper, the ability to 3D print lithium-ion batteries through thermoplastic material extrusion and polymer powder bed fusion is considered. Focused on the formulation of positive electrodes composed of polypropylene, LiFePO4 as active material, and conductive additives, advantages and drawbacks of both additive manufacturing technologies, are thoroughly discussed from the electrochemical, electrical, morphological and mechanical perspectives. Based on these preliminary results, strategies to further optimize the electrochemical performances are proposed. Through a comprehensive modeling study, the enhanced electrochemical suitability at high current densities of various complex three…
User session level diverse reranking of search results
2018
Most Web search diversity approaches can be categorized as Document Level Diversification (DocLD), Topic Level Diversification (TopicLD) or Term Level Diversification (TermLD). DocLD selects the relevant documents with minimal content overlap to each other. It does not take the coverage of query subtopics into account. TopicLD solves this by modeling query subtopics explicitly. However, the automatic mining of query subtopics is difficult. TermLD tries to cover as many query topic terms as possible, which reduces the task of finding a query's subtopics into finding a set of representative topic terms. In this paper, we propose a novel User Session Level Diversification (UserLD) approach bas…
Effect of Reaction Conditions on the Coprecipitation of Ni(OH)2 for Lithium-Ion Batteries
2023
Electrochemical performance of cathode active materials (CAMs) is dependent on the properties of coprecipitated precursors (pCAMs). This is a sensitive process affected by several reaction parameters such as temperature, pH, concentration of reactants, agitation rate, and residence time. In this paper, the effect of parameters influencing the particle size growth and the physical properties, such as particle morphology and tapped density, was studied in the coprecipitation of Ni(OH)2. Formation of a homogeneous population with narrow particle size distribution was observed, followed by a more heterogeneous population of dense particles. Ammonia concentration and residence time had significa…
Krievu klasiķu darbu ietekme uz Japānas moderno un mūsdienu literatūru
2022
Bakalaura darbs sastāv no 3 daļām un 6 nodaļām. Pirmajā daļā tiek apskatīta krievu klasiskās literatūras ienākšana un izplatīšanās Japānā laika posmā no 19. gadsimta otrās puses līdz 20. gadsimta otrajai pusei, kā arī tās ietekme uz Japānas literāro ainu. Otrajā daļā tiek apskatīts periods, kad krievu literatūra tika pētīta visaktīvāk un visstiprāk ietekmēja slavenākos japāņu rakstniekus. Šīs daļas nodaļās tiek pētīta ietekme uz konkrētiem 19. gadsimta otrās puses – 20. gadsimta pirmās puses japāņu rakstnieku darbiem. Trešajā daļā tiek apskatītas mūsdienu, t.i. laika posma no 20. gadsimta vidum, literatūrā atspoguļotās ietekmes izpausmes. Šīs daļas nodaļā tiek veikta Nakamuras Fuminori romā…