98047 research outputs found
Sort by
Optimizing a sustainable production-inventory model by integrating low-carbon material selection and progressive carbon tax policies
No full textAmid the escalating challenges of climate change, governments and enterprises worldwide are intensifying efforts to achieve net-zero emissions. Among various carbon reduction strategies, progressive carbon tax policies have emerged as a key mechanism for driving sustainable industrial transformation. However, how these policies influence production and inventory decisions within supply chains remains an important research question. Therefore, this study develops a sustainable multi-stage supply chain production-inventory model that explicitly incorporates progressive carbon tax policies, low-carbon raw material selection, and carbon reduction technology investment. The proposed model considers a supply chain structure consisting of a single manufacturer and a retailer, capturing the dynamic interactions between production, inventory management, and carbon emission costs. Through mathematical modeling and numerical simulations, we analyze the effects of progressive carbon tax schemes on optimal decision-making and system performance. Further, sensitivity analysis is conducted to evaluate the impact of key parameters, such as tax rates, emission reduction investments, and material selection, on supply chain efficiency and total costs. By integrating progressive carbon tax policies into supply chain management, our research fills a critical gap in the literature and provides practical insights for both policymakers and enterprises with high carbon emissions. We expect the findings can help businesses develop cost-effective sustainability strategies while assisting governments in designing policies that balance economic growth with environmental responsibility.補正完畢國際新北市，台灣TW
The impact of perceived corporate social responsibility on employees' turnover intention in professional team sports: A conditional mediation model
No full text補正完畢GB
Deux généalogies politiques Shang : systèmes sacrificiels et tensions mémorielles
No full textThis work analyzes the historical evolution of the zhouji 周祭, the series of cyclical sacrifices dedicated to non-royal and royal ancestors, first implemented during the reign of the king Zu Jia 祖甲. This cycle allows for anthropological observations about the structure and historical evolution of the Shang royal lineages. The cycle can be considered as a ritual aiming to establish a consensus between them since all the types of royal succession were acknowledged. It was also a memorial ritual since it began with Shang Jia 上甲, representing the clanic identity of the Shang as a whole. We also analyze a type of cyclical sacrifices (beng 祊) implemented from the reign of Wen Ding 文丁 on, a memorial ritual with a much more limited scope, linked to an attempt to establish a strict line of royal succession between father and son. Contrasting those two cycles allows for a much better understanding of the anthropological and political stakes of the last stage of Shang society, and particularly the tensions between linages’ memories. We will, in the conclusion, attempt to show that those tensions were due in part to one of the characteristics of monarchy as such.補正完畢NL
WS2 Moiré Superlattices Supporting Au Nanoclusters and Isolated Ru to Boost Hydrogen Production
No full textMaximizing the catalytic activity of single-atom and nanocluster catalysts through the modulation of the interaction between these components and the corresponding supports is crucial but challenging. Herein, guided by theoretical calculations, a nanoporous bilayer WS2 Moiré superlattices (MSLs) supported Au nanoclusters (NCs) adjacent to Ru single atoms (SAs) (Ru1/Aun-2LWS2) is developed for alkaline hydrogen evolution reaction (HER) for the first time. Theoretical analysis suggests that the induced robust electronic metal–support interaction effect in Ru1/Aun-2LWS2 is prone to promote the charge redistribution among Ru SAs, Au NCs, and WS2 MSLs support, which is beneficial to reduce the energy barrier for water adsorption and thus promoting the subsequent H2 formation. As feedback, the well-designed Ru1/Aun-2LWS2 electrocatalyst exhibits outstanding HER performance with high activity (η10 = 19 mV), low Tafel slope (35 mV dec−1), and excellent long-term stability. Further, in situ, experimental studies reveal that the reconstruction of Ru SAs/NCs with S vacancies in Ru1/Aun-2LWS2 structure acts as the main catalytically active center, while high-valence Au NCs are responsible for activating and stabilizing Ru sites to prevent the dissolution and deactivation of active sites. This work offers guidelines for the rational design of high-performance atomic-scale electrocatalysts.補正完畢DE
Metabolic engineering of the borneol and camphor degradation pathways in Pseudomonas to produce optically pure bicyclic monoterpenes
No full textBorneol, a medicinally important bicyclic monoterpene, facilitates drug transport across mucous membranes and the blood-brain barrier. Derivatives of borneol and camphor also have numerous biomedical applications. Borneol is currently industrially synthesized via the conversion of turpentine and α-pinene. However, the major product is racemic isoborneol rather than racemic borneol. Both borneol and isoborneol are degraded by the soil bacterium Pseudomonas via a well-established degradation pathway. Two indigenous Pseudomonas strains were used to convert racemic isoborneol to other optically pure bicyclic monoterpenes here. Our results showed that deletion of the camE2,5 gene alone from the strain TCU-HL1 genome led to the complete loss of borneol and camphor degradation ability. Knockout of both camE2,5 and bdh1 (TCU-HL1Δbdh1ΔcamE2,5) restored the degradation capability as the role of Bdh1 was replaced by that of Bdh2. This mutant converted racemic isoborneol into an optically pure bicyclic monoterpene, 2,5-diketocamphane, with a 45 % recovery yield. RT-qPCR results suggested that camE2,5 expression plays a pivotal role in regulating the borneol/camphor degradation cluster. While (+)-borneol, (–)-borneol and (+)-camphor can be obtained from plants for mass production purposes, (–)-camphor cannot be obtained in the same manner. P. monteilii TCU-CK1 converted racemic isoborneol into (–)-camphor and 3,6-diketocamphane, with 15 % and 10 % recovery yields, respectively. In conclusion, we report the role of camE2,5 in regulating the borneol/camphor degradation operon and biotransformation methods to produce several optically pure bicyclic monoterpenes.補正完畢NL
河川整治與六堆地方社會：隘寮溪整治與砂石產業之歷史考察
No full text本文藉由環境史與長時段的觀點，探究屏東平原的六堆聚落在長年遭受隘寮溪的氾濫時，地方社會肆應的歷史過程與影響。首先，透過對清代屏東平原與隘寮溪流域，以及涵蓋在內的六堆地區之水患紀錄進行歷史考察，得知清代屏東平原的先民長年遭受水患所苦的原因，除肇因於氣候、地理與水文等自然因素，可能還有隨著漢人經濟開發過程中所導致的人為因素。待廿世紀初期國家力量介入後，乃於1920至1930年代展開下淡水溪流域與隘寮溪的整治工程。工程除改變隘寮溪的流向，使居民免於遭受水患侵襲，同時也增加了許多河川浮覆地。不僅如此，整治工程也對屏東平原的自然地景、地方環境、民眾生活與社會經濟，產生深遠的影響。其次，下淡水溪整治工程築堤截流產生的大量浮覆地，舊河道與河床周邊大多為長年所沖積的卵石、礫石及碎石，要開墾成田園或是蔗作原料區，必須要先清除這些舊有溪石，才能進一步整地成為農業用地。因此，自1920年代下淡水溪整治前後，當地的砂石就因應大量公共工程的興建而開始被注意，之後隨著隘寮溪整治工程的開始，「砂石」才開始受到重視而興盛。換言之，看似為自然資源的砂石，某種程度來說其實是因河川整治才大興的一種「人為的」自然資源。而當這些砂石資源出現後，同時也改變了地方的社會經濟、人群階層，甚至對當地宗教文化等社會層面產生重大的影響。補正完畢TW
The evolutionary course of mathematics literary writings: A case study
No full textAttention to the disconnection between culture and mathematics has been addressed then and now (Wilder (in: Graves et al., Proceedings of the international congress of mathematicians, American Mathematical Society, 1950; Liu in Taiwan Journal of Mathematics Education, 8:79–88, 2021b). Recently, studies, workshops, and contests about an approach to relating culture and mathematics, such as incorporating mathematics history or mathematics writings in class, have emerged. However, although the effectiveness of such an approach was proved, employing it as instruction was still significantly ignored, not to mention the approach to creating mathematics literary writings—the goal that the Mathematics-Literature Contest aimed to achieve. Additionally, no empirical studies have systematically assessed the contest, especially from the cultural perspective. Through teachers’ and students’ perceptions, this qualitative case study aims to examine the impact of mathematics literary writings on the development of mathematics teaching/learning and the mathematics culture represented in the contest. Ten teachers and 20 students were interviewed. Data were analyzed by following Yin’s five phases (2016). The study visualizes an evolutionary model of the contest, signifying the development of mathematics culture simultaneously. Results demonstrated that the contest caused teachers and students, who constituted the internal force, to consolidate the mathematics culture, which was enriched by the external force—to reinterpret the connection between mathematics as well as culture and the reform of general education. The developed mathematics culture included elements other than mathematics, such as the Chinese writings and their interactions with mathematics and life experiences. The findings hold implications for mathematics and general education: An interdisciplinary curriculum design can help cultivate teachers’ and students’ intellectual acumen; higher education communities worldwide must follow the trend.補正完畢DE
Orbital Occupancy Modulation to Optimize Intermediate Absorption for Efficient Electrocatalysts in Water Electrolysis and Zinc-Ethanol-Air Battery
No full textSpin engineering is a promising way to modulate the interaction between the metal d-orbital and the intermediates and thus enhance the catalytic kinetics. Herein, an innovative strategy is reported to modulate the spin state of Co by regulating its coordinating environment. o-c-CoSe2-Ni is prepared as pre-catalyst, then in situ electrochemical impedance spectroscopy (EIS) and in situ Raman spectroscopy are employed to prove phase transition, and CoOOH/Co3O4 is formed on the surface as active sites. In hybrid water electrolysis, the voltage has a negative shift, and in zinc–ethanol–air battery, the charging voltage is lowered and the cycling stability is greatly increased. Coordinated atom substitution and crystalline symmetry change are combined to regulate the absorption ability of reaction intermediates with balanced optimal adsorption. Coordinated atom substitution weakens the adsorption while the crystalline symmetry change strengthens the adsorption. Importantly, the tetrahedral sites are introduced by Ni doping which enables the co-existence of four-coordinated sites and six-coordination sites in o-c-CoSe2-Ni. The dz2 + dx2-y2 orbital occupancy decreases after the atomic substitution, while increases after replacing the CoSe6-Oh field with CoSe6-Oh/CoSe4-Td. This work explores a new direction for the preparation of efficient catalysts for water electrolysis and innovative zinc–ethanol–air battery.補正完畢US
Nephroprotective effects of coriander (Coriandrum sativum) leaves aqueous extracts in aristolochic acid-intoxicated zebrafish embryos.
No full textCoriander is a notable medicinal plant known for its diverse properties, including anti-inflammatory, antioxidant, anticancer, analgesic, and anti-diabetic effects. Despite its recognized health benefits, research on its nephroprotective properties is limited. This study aimed to investigate the potential nephroprotective properties of an aqueous extract derived from coriander leaves using an aristolochic acid-intoxicated zebrafish model. To assess kidney abnormalities induced by aristolochic acid (AA), we utilized the transgenic line Tg(wt1b:egfp), which expresses green fluorescent protein (GFP) in the kidney. Our previous report indicated that AA exposure leads to acute renal failure in zebrafish characterized by kidney malformation and impaired renal function. However, pretreatment of coriander extract (CE) can mitigate kidney malformations induced by AA. In addition, CE pretreatment reduces the accumulation of red blood cells in the glomerular region. To verify the nephroprotective effects of CE, we analyzed renal function by measuring the glomerular filtration rate in zebrafish embryos. Results indicate that CE partially mitigates renal function impairment caused by AA exposure, suggesting its potential to attenuate AA-induced renal failure. Mechanistically, pretreatment with CE reduces the expression of proinflammatory and proapoptotic genes induced by AA. This suggests that CE likely alleviates acute renal failure by reducing inflammation and apoptosis. As a result, we regard zebrafish as a valuable model for screening natural compounds that have the potential to alleviate AA-induced nephrotoxicity.補正完畢US
Cobalt@Ruthenium Core@Shell nanoparticles embedded within nitrogen-doped carbon nanosheets as reversible oxygen electrocatalysts
No full textRational design and engineering of cost-effective, high-performance reversible oxygen electrocatalysts for both the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is imperative in advancing the progress of rechargeable metal-air batteries (r-MABs). Herein, nanocomposites based on Co@Ru core@shell nanoparticles embedded within N-doped carbon nanosheets (Co@Ru/CS) are prepared via facile galvanic exchange reactions of RuCl3 with Co/NC and used as an effective oxygen electrocatalyst for rechargeable zinc-air battery (r-ZAB). Electrochemical studies demonstrate a remarkable bifunctional catalytic performance of Co@Ru/CS towards both ORR and OER, featuring a low potential gap (ΔE) of only 0.69 V between the OER potential (E10,OER) at 10 mA cm−2 and half-wave potential (E1/2,ORR) of ORR, which is much lower than that of commercial Pt/C + RuO2 catalysts (0.76 V). Combined studies of experimental characterizations and density functional theory calculations show that the ORR activity arises primarily from the N-doped carbon and CoNx moieties in the composites, whereas RuO2/CoOOH produced at high electrode potentials is responsible for the OER activity. Co@Ru/CS based r-ZAB exhibits an open circuit voltage of 1.447 V, specific capacity of 781 mAh gZn−1, and maximum power density of 115 mW cm−2 at 0.83 V, a performance better than that with commercial Pt/C + RuO2 (1.412 V, 760.56 mAh gZn−1, and 91 mW cm−2). Results from this research underline the substantial impact of structural engineering on optimizing the electrocatalytic activity of nanocomposites for r-MABs.補正完畢NL