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Found 6319 publications
Investigation of the performance of direct forecasting strategy using machine learning in State-of-Charge prediction of Li-ion batteries exposed to dynamic loads
Publication Name: Journal of Energy Storage
Publication Date: 2021-04-01
Volume: 36
Issue: Unknown
Page Range: Unknown
Description:
On account of intense technological advances regarding Electric Vehicles, the state evaluation and prediction issues of Li-ion cells have become increasingly important for ensuring the competitiveness in terms of feasible performance and range. Albeit the wide investigation of various standard modelling and estimation techniques, only limited researches focus on their precision and applicability under heavy transient working conditions. This paper is concerned with Li-ion battery terminal voltage and State-of-Charge (SoC) prediction for two types of dynamic loads. Attention is focused on the investigation of the applicability of direct multi-step forecasting strategy in combination with Machine Learning. Beside that, a feature bank is composed of discharge profiles obtained at different C-rates. The set of discharge curves is proposed to complement the feature extraction, i.e. the additional historical data is considered for model building. Special care is devoted for the design of appropriate training data. Hence, a battery cell model is built for simulating intensive dynamic load scenarios in addition to the experimental setup. The cell model is validated by using measurement data. Results have demonstrated, that in case of WLTP-type discharge load of 0.3C-rate the forecasting performance is highly efficient on measurement data. Under dynamic loads of 1C-rate, or when small historical data is available, the application of feature bank improves the performance. We have obtained comprehensive results proving that the application of direct multi-step forecasting strategy using XGBoost represents a viable alternative to capture real-time the cell dynamics and predict the terminal voltage and SoC of Li-ion batteries exposed to dynamic loads.
Open Access: Yes
Biomolecule composition and draft genome of a novel, high-lipid producing Scenedesmaceae microalga
Publication Name: Algal Research
Publication Date: 2021-04-01
Volume: 54
Issue: Unknown
Page Range: Unknown
Description:
Lipid biosynthesis in microalgae can be stimulated by cultivation in low nitrogen medium. MACC-401 was isolated from the soil surface in Tres Marias (MG-Brazil). The strain shows the morphological characteristics of the Scenedesmaceae green algae. The daily biomass and lipid production of MACC-401 is remarkable, 0.36 g L−1 and 110 mg L−1, respectively. Exploration of the genetic background of this promising strain not only allows the utilization of this species for industrial-scale lipid production, but also provides genetic targets to select lipid-producing strains from microalgae collections. We conducted physiological experiments by cultivating MACC-401 in complete and N-limited media and performed genome sequencing as well as transcriptome analysis. The estimated nuclear genome size of MACC-401 is 99.503 Mbp and the chloroplast genome is 0.15 Mbp. The phylogenetic analysis confirmed that the MACC-401 belongs to the Scenedesmaceae family, and represents a genetically distinct accession in this family. A basic comparative transcriptome analysis resulted in the identification of N-starvation responsive genes, which could serve as markers to monitor the onset of lipid accumulation in algal cultures.
Open Access: Yes
Exopolysaccharides from lactic acid bacteria: Techno-functional application in the food industry
Publication Name: Trends in Food Science and Technology
Publication Date: 2021-04-01
Volume: 110
Issue: Unknown
Page Range: 375-384
Description:
Background: The growing consumer demand for foods that do not contain artificial additives and are “clean labeled” can be addressed in fermented products by using lactic acid bacteria (LAB) capable of synthesizing exopolysaccharides (EPS). There is great variability in LAB-based EPS in terms of quantity, monomer composition, molecular weight, charge, and structure, which results in an array of physicochemical and rheological properties that can be exploited for varied applications in the food industry. Scope and approach: EPS are an alternative class of bio-thickeners widely used in the food industry. This review provides a brief overview of EPS composition and production, and highlights EPS functionality, focusing on specific areas and ways of applying them in food products. Key findings and conclusions: Although EPS-producing LAB strains have been traditionally applied in the manufacture of cultured milks, their use in the production process of low-fat cheeses, different plant-based yogurt alternatives, diverse types of sourdough breads, and reduced-fat fermented meat products are some of the novel applications of these polymers. EPS interact with other food components to improve the rheological and sensory properties of foods and, thus, they can act both as texturizers and stabilizers, increasing the viscosity and mouthfeel of products. Despite the abundance of research findings, a better understanding of the structure–function relationship of EPS in food products still remains a challenge.
Open Access: Yes
Complex oncologic therapy for loco-regionally advanced breast cancer associated with long-lasting SARS-CoV-2 PCR-positivity
Publication Name: Orvosi Hetilap
Publication Date: 2021-04-01
Volume: 162
Issue: 16
Page Range: 611-614
Description:
Mortality of COVID-19 is increased when certain co-morbidities, among others advanced malignancies are present. Deleterious effect of cytotoxic therapy, related to its immunosuppressive effect, may also be hypothesised. However, postponing or cancelling oncologic treatment, especially in younger patients with advanced and more aggressive tumors may worsen the prognosis. The case of a 39-year-old female patient is presented, who was diagnosed with loco-regionally advanced breast cancer during the pandemic. Primary systemic chemotherapy was started. The patient presented with acute respiratory tract symptoms during the fifth cycle and subsequently SARS-CoV-2 infection was diagnosed. Chemotherapy was cancelled. Symptoms resolved in three days after diagnosis. SARS-CoV-2 PCR remained positive up to day 43. Antihormonal therapy was introduced on day 19 and she underwent mastectomy with axillary lymph node dissection on day 51. Chemotherapy was reset postoperatively on day 82 with prophylactic G-CSF protection. No adverse event was observed throughout the treatment. Cytotoxic chemotherapy and surgery can be successfully delivered in breast cancer patients with prolonged asymptomatic SARS-CoV-2 PCR positivity, even without negative swab result. Individual optimisation of the therapy may require deviations from standard protocols. Closer multidisciplinary cooperation may contribute to the minimisation of both oncologic and infectious risks.
Open Access: Yes
Effect of the energy, carbohydrate, protein, and amino acid profile on the quality of ovum and embryo in cattle
Publication Name: Magyar Allatorvosok Lapja
Publication Date: 2021-03-01
Volume: 143
Issue: 3
Page Range: 145-159
Description:
In the present review, the authors summarize the potential effects of energy, carbohydrate, protein, and amino acid supplementation on the reproductive performance of dairy and beef cattle, focusing on the development and quality of the ovum and the preimplantation embryo. Excess dry matter and energy intake can have a positive or negative effect on the development of the preovulatory follicle and embryo, depending on the body condition, the physiological status and the actual milk production of the cows. In this review, the importance of hormones (e.g. insulin, insulin-like growth factor and leptin) were taken into consideration regarding their role in the reproductive performance of the dairy and beef cattle. Feeding high levels of non-fibre car-bohydrates (NFC) can lead to hyperinsulinaemia and deteriorating results in embryo production. It is well-known that the type and composition of carbohydrates in the diet alter several physiological processes, but there is no exact information about the effects of carbohydrate-composition on the follicular development and embryo quality. High protein intake, particularly the rumen degradable protein (RDP), increases plasma urea concentration. High urea levels can lead to poor reproductive performance in cattle. Urea has a direct negative effect on the final stages of follicular development and indirectly alters embryonic development by decreasing pH in the uterine fluid. The levels of certain amino acids in the lumen of the pregnant uterus are significantly higher than before pregnancy. Methionine, lysine and histidine have the greatest rise at the presence of the preimplantation embryo. Feeding rumen-protected forms of these amino acids can positively alter embryo production, but further investigation is needed in this field. The authors deem that more research is needed to lay effective feeding strategies for the success of embryo production.
Open Access: Yes
DOI: DOI not available
Integrating the Internet of Things in the halal food supply chain: A systematic literature review and research agenda
Publication Name: Internet of Things Netherlands
Publication Date: 2021-03-01
Volume: 13
Issue: Unknown
Page Range: Unknown
Description:
To address consumers’ concerns regarding food integrity, halal food businesses need to rethink their conventional supply chains and leverage new technologies. The emergence and proliferation of the Internet of Things (IoT) - the use of interconnected devices, sensors, and technologies to orchestrate, monitor, and optimize supply chain processes - holds innovative potentials for the halal food supply chain (HFSC). Despite the growing popularity in supply chain management and logistics, the potentials and challenges of IoT in the HFSC remain – unexplored and further research is required. Therefore, the goal of this paper is to address this knowledge gap and review IoT research within the context of HFSCs. To begin, over seventy-three (73) papers were analyzed using both bibliometric techniques and in-depth content analysis. The results reveal that IoT offers five major benefits for the HFSC; namely, traceability of products, enhancement of supply chain efficiencies, facilitation of livestock management, authentication of foods’ halal status, and monitoring of halal certifications. Several challenges were identified, including the technical limitations of IoT devices, technological immaturity, lack of user acceptance, and cost and regulatory barriers. The study's findings provide deeper insight into the current state of IoT research in the halal food literature, its development, challenges and future research avenues for scholars, policy makers and the HFSC community.
Open Access: Yes
A coupled impact of different management and soil moisture on yield of winter wheat (Triticum aestivum L.) in dry conditions at locality Mezoföld, Hungary
Publication Name: Journal of Hydrology and Hydromechanics
Publication Date: 2021-03-01
Volume: 69
Issue: 1
Page Range: 76-86
Description:
Variable rate technology (VRT) in nutrient management has been developed in order to apply crop inputs according to the required amount of fertilizers. Meteorological conditions rarely differ within one field; however, differences in soil conditions responding to precipitation or evaporation results within field variations. These variations in soil properties such as moisture content, evapotranspiration ability, etc. requires site-specific treatments for the produced crops. There is an ongoing debate among experts on how to define management zones as well as how to define the required amount of fertilizers for phosphorus and nitrogen replenishment for winter wheat (Triticum aestivum L.) production. For management zone delineation, vegetation based or soil based data collection is applied, where various sensor technology or remote sensing is in help for the farmers. The objective of the study reported in this paper was to investigate the effect of soil moisture data derived from Sentinel-2 satellite images moisture index and variable rate phosphorus and nitrogen fertilizer by means of variable rate application (VRA) in winter wheat in Mezoföld, Hungary. Satellite based moisture index variance at the time of sowing has been derived, calculated and later used for data comparison. Data for selected points showed strong correlation (R2 = 0.8056; n = 6) between moisture index and yield, however generally for the whole field correlation does not appear. Vegetation monitoring has been carried out by means of NDVI data calculation. On the field level, as indicated earlier neither moisture index values at sowing nor vegetation index data was sufficient to determine yield. Winter wheat production based on VRA treatment resulted significant increase in harvested crop: 5.07 t/h in 2013 compared to 8.9 t/ha in 2018. Uniformly managed (control) areas provided similar yield as VRA treated areas (8.82 and 8.9 t/ha, respectively); however, the input fertilizer was reduced by 108 kg/ha N and increased by 37 kg/ha P.
Open Access: Yes
5G Networks in the Value Chain
Publication Name: Wireless Personal Communications
Publication Date: 2021-03-01
Volume: 117
Issue: 2
Page Range: 1577-1599
Description:
As Information and Communication Technologies are evolving rapidly and at an exponential pace‚ businesses are forced to cope with the latest trends in innovation and to respond to emerging needs and opportunities. The constant digitization and process automation (digitalization) of supply chains call for the consideration of innovative services to sustain value chain efficiency and effectiveness. Given the approaching technological developments‚ the new network upgrades embodied in 5G networks raises several high expectations along the value chain. This paper recognizes the critical role of 5G telecommunications to support several value chain activities and create value propositions that would not be possible with existing network generations. To this end‚ Porter’s value chain model is applied and comprehensively discussed to highlight the potential areas that could be facilitated by 5G telecommunications.
Open Access: Yes
Mapping quality linkages based on tacit knowledge
Publication Name: International Journal of Production Economics
Publication Date: 2021-03-01
Volume: 233
Issue: Unknown
Page Range: Unknown
Description:
A structured conceptualization method, concept mapping, is applied to visualize the conceptual domain of explicit and tacit quality linkages in a complex, causally ambiguous production system of a premium automotive OEM. Experts, intimately familiar with all facets of the conceptual domain, defined sources of quality problems and rated their impact on product quality. These inputs, formative measures for a latent construct, were used to create concept maps and clusters for the sources of quality problems. Differences and disagreements between subgroups were highlighted by pattern matching. The concept map and the preferred cluster solution, based on user-defined measures, served as inputs in the development of a causal loop diagram and an action plan for better resource allocation to specific improvement activities. The approach, using formative rather than the more commonly used reflective indicators, uses key informants and explanation building processes of high internal validity. In the spirit of the “proximal similarity model,” the presented methodology is also highly transferable to similar settings of other automotive OEMs and beyond.
Open Access: Yes
