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Modulation of the nonlinear optical response and transient dynamics of cdO/Ag/cdO sandwich-type films

OPTIcS AND LASER TEcHNOLOGY 2024年 168卷

作者： Liu, Kun Li, Zhongguo Li, Jie Zhou, Wenfa Wu, Xingzhi Fang, Yu Yang, Junyi Shao, Zhangyang Zhao, Run Song, Yinglin Soochow Univ Sch Phys Sci & Technol Suzhou 215006 Peoples R China Changshu Inst Technol Sch Elect & Informat Engn Changshu 215500 Peoples R China Suzhou Univ Sci & Technol Sch Phys Sci & Technol Jiangsu Key Lab Micro & Nano Heat Fluid Flow Techn Suzhou 215009 Peoples R China Harbin Inst Technol Dept Phys Harbin 150001 Peoples R China

Sandwich-type materials with tunable optical response and enhanced optical nonlinearity are of great importance for future nanophotonic devices. Herein, we investigate the third-order nonlinear optical response and transient dynamics of a series of cdO/Ag/cdO sandwich-type films with different Ag sputtering time. SEM images demonstrate that the Ag layer in cdO/Ag/cdO sandwich-type films change from a nanoisland to semicontinuous film with increase of Ag sputtering time. Z-scan measurements indicate that the cdO/Ag/cdO sandwich-type films exhibit huge nonlinear optical response on both femtosecond and picosecond time regime. The maximum nonlinear absorption coefficient (& beta;= 1.605 x 10-8m/W) and nonlinear refractive index (n2 = -6.70 x 10-15m2/W) of the cdO/Ag/cdO film with 4 min Ag sputtering time are obtained in picosecond Z-scan, which are about 17 and 10 times greater than that of the single-layer cdO, respectively. Transient absorption spectroscopy results confirm the effect of increased cdO/Ag/cdO interface binding on the thermal electron transfer mechanism. A model is proposed to describe the ultrafast dynamic processes in the cdO/Ag/cdO sandwich-type films. Our results indicate the cdO/Ag/cdO sandwich-type films with tailored nonlinear optical properties are highly promising for applications of optical switches devices.

关键词： c A-time c film Surface plasmon resonance Nonlinear absorption Nonlinear refraction

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Tobacco stem-derived porous carbon-supported Ru catalysts for efficient electrochemical hydrogen evolution

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MRS cOMMUNIcATIONS 2024年第6期14卷 1452-1459页

作者： Ding, Wei Shen, Kai Pan, Fanda Gao, Xuefeng Li, Mingxing Xia, chen Xia, Wenxin Guo, Dian Wang, Momo Zhou, Lihui Fan, Hu Dai, Sheng China Tobacco Zhejiang Ind Co Ltd Hangzhou Cigarette Factory Hangzhou 310011 Peoples R China China Tobacco Zhejiang Ind Co Ltd Technol Ctr Hangzhou 310011 Peoples R China East China Univ Sci & Technol Inst Fine Chem Sch Chem & Mol Engn Key Lab Adv Mat Shanghai 200237 Peoples R China East China Univ Sci & Technol Feringa Nobel Prize Scientist Joint Res Ctr Inst Fine Chem Sch Chem & Mol Engn Shanghai 200237 Peoples R China

Utilization of waste tobacco stems holds significant environmental and economic value. This study developed a hierarchical porous carbon matrix from waste tobacco stems via pyrolysis with Fecl3 activation. The resulting tobacco stem-derived porous carbon (TPc)-anchored Ru nanoparticles, demonstrating significant activity in the hydrogen evolution reaction (HER) in acid and alkaline electrolytes. The optimal catalyst, Ru/TPc-900, produced at 900 degrees c with 1.5-wt% Ru, achieved an overpotential of 24 mV (at 10 mA/cm(2)), and a Tafel slope of 48 mV/dec in 1.0-M KOH, outperforming conventional Ru/c catalysts.

关键词： catalytic c Porosity Ru

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Neighborhood persistency of the linear optimization relaxation of integer linear optimization

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MATHEMATIcAL PROGRAMMING 2024年 1-19页

作者： Kimura, Kei Nakayama, Kotaro Kyushu Univ Fac Informat Sci & Elect Engn Fukuoka Japan Oplan Inc Tokyo Japan

For an integer linear optimization (ILO) problem, persistency of its linear optimization (LO) relaxation is a property that for every optimal solution of the relaxation that assigns integer values to some variables, there exists an optimal solution of the ILO problem in which these variables retain the same values. Although persistency has been used to develop heuristic, approximation, and fixed-parameter algorithms for special cases of ILO, its applicability remains unknown in the literature. In this paper, we reveal a maximal subclass of ILO such that its LO relaxation has persistency. Specifically, we show that the LO relaxation of ILO on unit-two-variable-per-inequality (UTVPI) systems has persistency and is (in a certain sense) maximal among such ILO. Our result generalizes the persistency results by Nemhauser and Trotter, Hochbaum et al., and Fiorini et al. Even more, we propose a stronger property called neighborhood persistency and show that the LO relaxation of ILO on UTVPI systems in general has this property. Using this stronger result, we obtain a fixed-parameter algorithm (where the parameter is the optimal value) and another proof of 2-approximability for ILO on UTVPI systems where objective functions and variables are non-negative.

关键词： Integer linear optimization Linear optimization Unit-two-variable-per-inequality system Persistency 90 c 10

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“c语言程序设计”课程思政教学设计研究与实践

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北京政法职业学院学报 2021年第3期 101-108页

作者：辛向丽北京政法职业学院信息媒体学院

高职教育不仅突出学生应用性和实践性的培养,同时注重学生职业能力和职业精神的培养。本文在研究计算机语言类课程教学现状的基础上,深入挖掘专业课程思政元素,进行课程思政整体教学设计和单元教学设计,主要选取工程项目的典型任务,确... 详细信息

高职教育不仅突出学生应用性和实践性的培养,同时注重学生职业能力和职业精神的培养。本文在研究计算机语言类课程教学现状的基础上,深入挖掘专业课程思政元素,进行课程思政整体教学设计和单元教学设计,主要选取工程项目的典型任务,确定任务的三级目标,知识目标、能力目标和思政目标。以知识目标和能力目标作为技术技能切入点,润物细无声地融合课程思政目标,并通过多种方式进行呈现,具体实在,实用见效,在学生中起到了良好的教学效果。

关键词：课程思政 c 语言教学设计三级目标

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Molecular dynamics approach for the calculation of the surface loss probabilities of neutral species in argon-methane plasma

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PLASMA PROcESSES AND POLYMERS 2024年第2期21卷 2300120-2300120页

作者： Otakandza-Kandjani, Glenn-christopher Brault, Pascal Mikikian, Maxime Michau, Armelle Hassouni, Khaled Univ Orleans GREMI CNRS UMR7344 Orleans France Univ Sorbonne Paris Nord LSPM CNRS UPR3407 Villetaneuse France Univ Orleans GREMI CNRS UMR 7344 F-45067 Orleans 2 France

Molecular dynamics simulations are carried out for calculating the surface loss probabilities of neutral species from an argon-methane plasma. These probabilities are the sum of the sticking and surface recombination probabilities. This study considers both the formation of reactive and nonreactive volatile species for evaluating recombination probabilities. Results show that stable species are reflected when hydrocarbon film starts growing on the surface. cH3 is mainly lost by surface recombination leading to the formation of volatile products while very little contributes to film growth. c2H has surface loss probability in agreement with the literature. While c2H loss is usually attributed to sticking on the surface, our results show that its main loss process is due to surface recombination.

关键词： c H film hydrocarbon plasma molecular dynamics sticking probability surface loss probability surface recombination probability

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Preparation of Titanium carbide by carburisation of Titanium Dioxide

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PROcESSES 2024年第1期12卷 102页

作者： Lv, Tingting Tian, Fang Hu, Tu Kunming Univ Sci & Technol Fac Met & Energy Engn Kunming 650093 Peoples R China Kunming Univ Sci & Technol Yunnan Prov Key Lab Intensificat Met Kunming 650093 Peoples R China Kunming Univ Sci & Technol State Key Lab Complex Nonferrous Met Resources Cle Kunming 650093 Peoples R China Shandong Res & Design Inst Ind Ceram Co Ltd Zibo 255000 Peoples R China

Titanium carbide has attracted widespread attention due to its excellent properties. This study investigates the process of carbon thermally reducing TiO2 to prepare Tic through a combination of thermodynamic analysis and experiments. The effects of temperature, TiO2/c molar ratio, and time on the phase transformation and morphology evolution of the products are investigated. The synthesis of titanium carbide involves the main reduction path of TiO2-Magn & eacute;li-Ti3O5-Ti2O3-TicxO1-x. With the increase in reaction temperature and Tic content, the microstructure transitions from a smooth disc-like structure to a loose and porous layered structure, while the particle size decreases significantly. The carburisation rate of the reduced product is more affected by temperature, according to chemical analysis. The carburisation rate increased from 18.37% to 36.09% for 2 h-10 h of holding time at 1400 degrees c, and from 51.43% to 77.57% for 2 h-10 h of holding time at 1500 degrees c. The quantification of the carburisation rate provides a valuable reference for the preparation of titanium carbide by TiO2.

关键词： carbothermic reduction TiO2 c Tic carburisation rate

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changes in inflammatory biomarkers related to c-reactive protein and albumin in patients with terminal cancer receiving palliative care: a longitudinal study.

Brazilian Journal of Oncology

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Brazilian Journal of Oncology 2022年第CONTINUOUS PUBLICATION期18卷

作者： Emanuelly Varea Maria Wiegert Larissa calixto Lima Gabriella da costa cunha Tais Saint Martin Fonseca Geisiane Alves da Silva Livia costa de Oliveira National Cancer Institute Palliative Care Unit - Rio de Janeiro - Rio de Janeiro - Brazil

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Life cycle inventory and assessment of canadian faba bean and dry bean production

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SUSTAINABLE PRODUcTION AND cONSUMPTION 2024年 46卷 442-459页

作者： Bamber, Nicole Arulnathan, Vivek Puddu, Lana Smart, Alyssa Ferdous, Jannatul Pelletier, Nathan Univ British Columbia Food Syst PRISM Lab Okanagan Campus226-3247 Univ Way Kelowna BC V1V1V7 Canada

Pulses are nutritionally beneficial and cost-effective food/feed products, and are also nitrogen-fixing crops that can improve the environmental sustainability of annual cropping systems when included in crop rotations - particularly with respect to GHG emissions. canada is a major producer and exporter of pulses, therefore the goals of this study were to (a) develop regionalized life cycle inventories (LcIs) for canadian faba and dry beans suitable for incorporation into public LcI databases and (b) conduct ISO 14044-compliant LcAs of canadian faba, navy, pinto, and kidney beans at provincial, ecozone, and national scales. LcI data were collected via survey from similar to 200 canadian faba and dry bean farmers. At the national scale of aggregation, faba beans had considerably lower impacts across all impact categories considered than the three dry bean types. This is due to their lower input requirements (particularly fertilizer), and higher nitrogen fixation capabilities. Among the three dry bean types considered, pinto beans had the lowest environmental impacts across most impact categories. Fertilizer production and field-level emissions from fertilizer use were the major contributors to the overall environmental impacts of the production of all bean types. In addition to differences between bean types, there were also differences within bean types, between regions of production and levels of regional aggregation. The results of the uncertainty analysis revealed that variability was lowest when aggregated at the ecozone level, based on soil and climate factors, and highest when aggregated to the national average. Taken together, these results demonstrate the utility of spatially-resolved LcI and LcA modelling that distinguishes between different types of pulse crops in order to accurately estimate impacts, and to support decision-making in pursuit of more sustainable food systems. Future research needs include more primary data on field-level biological nitroge

关键词： APOS at point of substitution BNF biological nitrogen fixation c carbon cML center of Environmental Science, Leiden University cO 2 carbon dioxide DQI data quality indicator EPD Environmental Product Declaration GHG greenhouse gas IcMB Introductory carbon Balance Model IPcc International Panel on climate change ISO International Organisation for Standardisation LcA life cycle assessment LcI life cycle inventory LcIA life cycle impact assessment N nitrogen N 2 O nitrous oxide NH 3 ammonia NO 3 nitrate NOx nitrogen oxides OMAFRA Ontario Ministry of Agriculture, Food and Rural Affairs P phosphate SLc Soil Landscapes of canada SOc soil organic carbon

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Tunable auxeticity in hydrogenated carbon nanotube origami metamaterial

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MRS BULLETIN 2024年第1期49卷 38-48页

作者： cai, Jun Shahryari, Benyamin Akbarzadeh, Abdolhamid McGill Univ Dept Bioresource Engn Montreal PQ Canada McGill Univ Dept Mech Engn Montreal PQ Canada

Inspired by the origami architecture and the progress in the functionalization of carbon-based nanomaterials, we design a carbon nanotube origami (cNT-O) metamaterial with the assistance of hydrogenation and by utilizing molecular dynamics simulation. The mechanical properties, including stiffness, ultimate strength, failure strain, and Poisson's ratio, are systematically studied. Our findings show that the mechanical properties of cNT-O can be tuned and programmed by altering the underlying topological parameters and adopting surface functionalization. We resort to computational simulation, theoretical analysis, and experimentation to demonstrate that an extremely broad range of strain-dependent and scale-independent negative Poisson's ratio can be achieved for nanoarchitected metamaterials, mainly driven by the kinematics of the folding/unfolding in origamis. The proposed origami strategy imparts a platform for designing the next generation of low-dimensional nanomaterials (e.g., graphene and cNT) with highly tunable auxeticity.

关键词： Hydrogenation Nanostructure Nanoscale Simulation c

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Butanol production from alkaline pretreated bamboo using co-culture of wood-rotting fungus Phlebia sp. MG-60-P2 and bacterium clostridium saccharoperbutylacetonicum

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BIOMASS cONVERSION AND BIOREFINERY 2024年第17期14卷 20551-20558页

作者： chu Luong Tri Le Duy Khuong Kamei, Ichiro Ha Long Univ Fac Environm 258 Bach Dang St Uong Bi Quang Ninh Prov Vietnam Univ Miyazaki Fac Agr 1-1 Gakuen Kibanadai Miyazaki 8892192 Japan

Biofuel production is currently focused on the utilization of polysaccharides in lignocellulosic biomass. In this research, butanol was produced from sodium hydroxide-pretreated bamboo by a co-culture with the wood-rotting fungus Phlebia sp. MG-60-P2 and bacterium c. saccharoperbutylacetonicum. The bacterial monoculture could not utilize the pretreated bamboo, but the co-culture with P2 was successful. co-culturing produced 0.5 g/L butanol, 1.3 g/L butyric acid, and 0.3 g/L ethanol from 20.0 g/L bamboo pretreated with 5.0% NaOH. The co-culture not only gave the biofuel products but also enhanced the total saccharification rate of polysaccharides in the pretreated bamboo. A combination of 1.0% NaOH pretreatment with the co-culture succeeded in the highest theoretical conversion (46.1%) of carbon (in moles) from the polysaccharides to the fermentation products. This is the first report on the synergistic effects of white-rot fungus Phlebia sp. MG-60-P2 and anaerobic bacterium c. saccharoperbutylacetonicum in a co-culture to metabolize cellulose and hemicellulose in sodium hydroxide-pretreated lignocellulose to produce butanol.

关键词： Acetone-butanol-ethanol fermentation Phlebia sp MG-60-P2 c saccharoperbutylacetonicum co-culture

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