检索结果-内蒙古大学图书馆

RSSI-Based Autonomous Tracking System for Radio-Tagged Flying Insects Using UAV With Rotational Antenna

IEEE Access 2025年 13卷 72040-72053页

作者： Pak, Jeonghyeon Kim, Bosung Son, Hyoung Il Chonnam National University Department of Convergence Biosystems Engineering Gwangju61186 Korea Republic of Chonnam National University Interdisciplinary Program in IT-Bio Convergence System Gwangju61186 Korea Republic of Chonnam National University Research Center for Biological Cybernetics Gwangju61186 Korea Republic of

The escalating effects of climate change have heightened the urgency of ecosystem conservation efforts worldwide. In this context, pollinators such as honeybees play a critical role in maintaining ecosystem health. However, they face appreciable threats, including the proliferation of invasive alien species (IAS) and colony collapse disorder. In this study, we propose a novel tracking system that uses unmanned aerial vehicles (UAVs) equipped with rotational directional antennas and radio telemetry systems. This approach, which represents an improvement over our previous works, aims to protect biodiversity and ecosystem resilience by mitigating the adverse impacts of IAS on pollinator populations. To implement the proposed tracking strategy, a motor-based directional antenna that can rotate 360° is attached to a UAV, and the received signal strength indicator (RSSI) value is used to localize the hornets to which sensors are attached. The proposed tracking system was verified in a simulated field environment that was constructed by considering the RSSI values obtained in a forest. In addition, the robustness and field applicability of the tracking system were improved by applying it to scenarios consisting of different paths that were constructed considering the dynamic nature of hornets. © 2013 IEEE.

关键词： Unmanned aerial vehicles (UAV)

来源：评论

学校读者我要写书评

暂无评论

Deciphering Self-Assembly Mechanisms of IRMOF-n-Inspired Three-Dimensional Cubic-Symmetry Nanoporous Crystals from Multiscale Simulations

引用

Chemistry of Materials 2025年第10期37卷 3799-3812页

作者： Ardila, Katherine Liu, Tsung-Wei Gómez-Gualdrón, Diego A. Pak, Alexander J. Department of Chemical and Biological Engineering Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States Materials Science Program Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States Quantitative Biosciences and Engineering Program Colorado School of Mines 1601 Illinois Street Golden 80401 CO United States

The formation mechanisms of metal−organic frameworks (MOFs) are not fully understood. Therefore, experimental realization of potential “breakthrough” MOFs is hindered by uncertainty in the synthesis conditions that would allow the constituent nodes and linkers to self-assemble into the targeted MOF structure. Here, a multiscale endeavor using density functional theory (DFT) calculations, followed by metadynamics with DFT-informed classical atomistic potentials, followed by standard molecular dynamics (MD) and Hamiltonian replica exchange (HREX) simulations with a metadynamics-informed, coarse-grained (CG) model, was used to study the self-assembly mechanism of cubic-symmetry porous crystals inspired by the IRMOF-n family of MOFs. Mechanistic differences were examined for different values of node-linker coordination strength─understood as the free energy penalty for breaking a coordination bond in a solvated environment. Our integrated analyses of HREX-derived free energy surfaces and standard MD trajectories indicate that at coordination strengths typical of the IRMOF-n family in dimethylformamide (DMF) (i.e., 52 kJ/mol), disassembled nodes and linkers are favored to overcome a small 1.3 kJ/mol free energy barrier to first form solid amorphous clusters, which then overcome a series of barriers (the largest of which is 3.7 kJ/mol) to heal and form ordered, more stable, cubic-symmetry crystals. This healing seems to occur through the splintering/reattaching of small clusters from/to large clusters. Our analyses also suggest that if coordination strength is moderately weakened (e.g., to 40 kJ/mol), crystals form without the preliminary formation of amorphous clusters. However, further coordination strength weakening (e.g., to 36 kJ/mol) makes the formation of sizable crystals unfavorable thermodynamically. On the other hand, strengthening the coordination would increase the free energy barrier to heal the amorphous clusters into crystals. Accordingly, if coordination b

关键词： Hamiltonians

来源：评论

学校读者我要写书评

暂无评论

Enhanced production of microbial levulinic acid through deletion of the levulinic acid transcriptional regulator (lvaR) in engineered Pseudomonas putida KT2440

引用

Bioprocess and Biosystems engineering 2025年 1-14页

作者： Kim, Hyun Jin Kim, Byung Chan Lim, Gaeun Han, Yebin Jeong, Yunhee Kim, Hee Taek Jeon, Woo-Young Ahn, Jungoh Bhatia, Shashi Kant Yang, Yung-Hun Advanced Materials Program Department of Biological Engineering College of Engineering Konkuk University Seoul 05029 South Korea Department of Food Science and Technology Chungnam National University Daejeon South Korea Biotechnology Process Engineering Center Korea Research Institute Bioscience Biotechnology (KRIBB) Chungbuk South Korea Institute for Ubiquitous Information Technology and Application Konkuk University Seoul South Korea

Levulinic acid (LA) is a platform compound regarded as a promising organic intermediate for the synthesis of various chemicals such as fuel additives, plasticizers, solvents, and pharmaceuticals. Traditionally, LA is produced via acid-catalyzed dehydration and hydrolysis of lignocellulosic biomass, but this process involves challenges such as high temperatures and pressures, the use of strong acids, byproducts formation, and limitations in recovery and purification. To provide an alternative for chemical synthesis, we previously designed an integrated process to produce LA from glucose using genetically engineered Pseudomonas putida KT2440. However, as the consumption of the produced LA could not be completely prevented, its overall yield was limited. Therefore, in this study we constructed P. putida strains with additional knock-out of the lva operon genes (lvaAB, lvaE, and lvaR) in a pcaIJ knock-out strain, and introduced the aroG, asbF, and adc genes to design an LA production pathway. The pcaIJ, lvaR double knock-out strain P. putida HP205 produced 20.42 mM of LA from glycerol, and culture condition including temperature, glucose concentration, and nitrogen source were optimized. Under optimal conditions, P. putida HP205 produced 73.9 mM (8.58 g/L) LA in fed-batch fermentation. When crude glycerol was used as the substrate, both LA production and cell growth were enhanced. This study presents the impact of the LA transcriptional regulator and demonstrates a strategy for enhanced LA production in P. putida. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： adc aroG asbF Levulinic acid lva operon lvaR

来源：评论

学校读者我要写书评

暂无评论

Impact of discharge gas on a novel continuous flow in-liquid plasma discharge process for cobalt remediation and recovery from wastewater

引用

Journal of Environmental Management 2025年 384卷 125570页

作者： Mohotti, Dinithi Hossain, Md Mokter Mukhtar, Ahmad Wu, Sarah Environmental Science Program University of Idaho MoscowID83844 United States Department of Chemical and Biological Engineering University of Idaho MoscowID83844 United States

Cobalt contamination in wastewater poses significant health and environmental risks, necessitating efficient removal and recovery strategies. This study examines the role of various discharge gases-air, argon, hydrogen, and helium-in optimizing cobalt removal/recovery and energy efficiency using a novel continuous flow in-liquid plasma discharge (CFILPD) process. The effect of gas flow rate and applied power were assessed with air and argon to determine optimal conditions for maximizing cobalt removal. In air discharge, increased gas flow rate reduced cobalt removal due to the formation of acidic reactive species, whereas argon flow rate had no significant impact. Under the optimal operating condition at 200 W and 0.2 L/min gas flow, cobalt removal after 30-min treatment followed the trend: hydrogen (92 %) > helium (90 %) > argon (89 %) > air (74 %). Introduction of discharge gases enhanced energy efficiency of the CFILPD process by 34.5 % compared to gas-free operation. Helium gas yielded the highest energy efficiency (0.393 g/kWh) during the first 20 min, with similar result observed for argon, and both showed fastest kinetics in cobalt removal. The process yielded cobalt oxide particles as the sole byproduct, offering economic value for industrial applications. Morphological analysis revealed that particles recovered with argon exhibited smoother surfaces, while those obtained using air, helium, and hydrogen displayed porous structures. These findings underscore the potential of the CFILPD process as an effective and energy-efficient method for cobalt removal and recovery from wastewater, with argon emerging as the most cost-effective option. © 2025 Elsevier Ltd

关键词： Wastewater reclamation

来源：评论

学校读者我要写书评

暂无评论

Porous Poly(vinylidene fluoride-co-hexafluoropropylene)/copper oxide nanocomposite membranes for piezoelectric strain sensing

引用

Discover Applied Sciences 2025年第5期7卷 1-17页

作者： Al-Ejji, Maryam Promi, Tamanna Sangor, Farah Al-Awa, Zinab Bonthula, Sumalatha Radhika, V. Ponnamma, Deepalekshmi Center for Advanced Materials Qatar University P O Box 2713 Doha Qatar Department of Biological and Environmental Sciences Qatar University P O Box 2713 Doha Qatar Department of Chemical Engineering University of Calicut Kerala Thenhipallam India Materials Science and Technology Program Department of Mathematics Statistics and Physics College of Arts and Sciences Qatar University Doha2713 Qatar

The emerging field of porous piezoelectric strain sensors attracted a wide range of applications in healthcare monitoring, wearable electronics, and other dynamic applications due to their durability, high sensitivity, and real-time monitoring. This study presents the development of porous poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP)/copper oxide (CuO) nanocomposite membranes for piezoelectric strain sensing. The morphology and the dispersion of CuO nanoparticles and nanofibers in PVDF piezoelectric films with different nano-CuO contents are studied by X-ray diffraction, Fourier transform infrared spectrum, scanning electron microscopy and dielectric studies. The PVDF-HFP acts as a scaffold, allowing ions to flow within the porous percolated channels, resulting in a highly robust membrane with desired dielectric properties. The DMA studies enhanced the strain sensing performance of the 3.5 and 7 wt.% CuO nanofibers loaded with PVDF-HFP membranes compared with the 3.5 and 7 wt.% CuO nanoparticles and pristine membranes. The dielectric properties of the composites also showed high storage values for the CuO/PVDF-HFP samples compared to the pristine polymer. Moreover, the surface water contact angles of the membranes have slightly increased after loading the nanomaterial into the PVDF-HFP matrix, which strongly influenced the surface energies, indicating hydrophobicity. The current study, thus, demonstrates the piezoelectric strain sensing devices made from PVDF-HFP/CuO nanofibers for humid atmospheres. © The Author(s) 2025.

关键词： Fourier transform infrared spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Post-fire phenology of the tree fern Cyathea mexiae at the edge of a semideciduous Forest in Brazil

引用

Science of Nature 2025年第3期112卷 1-13页

作者： Lauro, Ana Taliê Dutra Lima, Lucas Vieira Menini Neto, Luiz de Paiva Farias, Rafael Institute of Biological Sciences Department of Botany Federal University of Juiz de Fora Leopoldo Krieger Herbarium Minas Gerais Juiz de Fora City Brazil Postgraduate Program in Forest Engineering Regional University of Blumenau São Paulo Street Santa Catarina Blumenau City Brazil Posgraduate Program in Biodiversity and Evolution Federal University of Bahia Bahia Salvador Brazil Dr. Roberto Miguel Klein Herbarium Regional University of Blumenau Blumenau Blumenau Brazil Posgraduate Program in Biodiversity and Nature Conservation Federal University of Juiz de Fora Juiz de Fora Brazil

Phenology investigates the periodicity of biological events related to plant growth. There is limited phenological information on ferns, particularly under disturbance conditions such as forest edges and fire. This study aimed to identify phenological patterns and responses to environmental factors and post-accidental fire events, including leaf production and mortality, and the number of leaves of Cyathea mexiae Copel. at the edge of a semi-deciduous seasonal remnant of the Atlantic Forest in Brazil. Twenty-four plants were monitored for 22 months, with 10 of them affected by fire. We quantified and compared leaf number, production, and mortality, and evaluated their relationships with environmental factors (rainfall, temperature, and humidity), considering two groups: burned and unburned. Trunk height was measured and related to phenological events. Only one plant died post fire. Burned and unburned groups showed no significant differences in trunk height, leaf number, production, or mortality. Both groups exhibited discontinuous and irregular leaf production and mortality patterns. Both groups produced leaves immediately post fire, though with differences in peak timing. Burned plants displayed a rapid peak in leaf production (September), earlier than the peak in unburned plants (November). Only leaf mortality in unburned plants was positively correlated with rainfall and humidity. This study demonstrated a rapid recovery in leaf numbers following accidental fire for C. mexiae. The study revealed non-seasonal trends in the leaf production patterns of C. mexiae, with fire potentially inducing leaf mortality, reducing the sensitivity of this phenophase to environmental factors, and altering the timing of peak leaf production between the groups. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2025.

关键词： Edge forest Environmental triggers Leaf production post-fire Plant-climate interactions Tropical phenology

来源：评论

学校读者我要写书评

暂无评论

Surface-Aligned Cholesteric Liquid Crystalline Elastomers with Tunable Mechanical Properties via Thiol-Ene Chemistry

引用

Macromolecules 2025年

作者： Phillips, Alexis T. Chen, Judy C. Kennedy, David T. White, Timothy J. Department of Chemical and Biological Engineering University of Colorado Boulder 80309 CO United States Material Science and Engineering Program University of Colorado Boulder 80309 CO United States

Cholesteric liquid crystals (CLCs) exhibit Bragg reflection due to their spontaneous self-assembly into a one-dimensional photonic structure. Retaining this cholesteric order in a polymer network requires functionalizing liquid crystals with reactive end groups. However, conventional chemistries for synthesizing cholesteric liquid crystalline polymers often result in poor surface alignment and reduced optical quality. In this work, we investigate a thiol-ene step-growth polymerization approach to fabricate cholesteric liquid crystalline elastomers (CLCEs) with tunable mechanical properties and improved optical quality. By varying the cross-link density, we systematically study the effects on haze, cross-linking degree, and mechanical response. Compared to existing cholesteric liquid crystalline polymers, the thiol-ene-based CLCEs exhibit enhanced surface alignment, reduced haze, and greater mechanical tunability. These materials are further benchmarked against CLCEs synthesized via thiol-acrylate chain transfer polymerization, highlighting the advantages of the thiol-ene reaction for achieving precisely controlled properties in cholesteric polymer networks. © 2025 American Chemical Society.

关键词： Cholesteric liquid crystals

来源：评论

学校读者我要写书评

暂无评论

Nonuniform organic carbon stock loss in soils across disturbed blue carbon ecosystems

引用

Nature Communications 2025年第1期16卷 1-15页

作者： Fu, Chuancheng Klein, Shannon G. Breavington, Jessica Lim, Kah Kheng Steckbauer, Alexandra Duarte, Carlos M. Marine Science Program Biological and Environmental Science and Engineering Division (BESE) King Abdullah University of Science and Technology (KAUST) Thuwal Saudi Arabia

Conserving blue carbon ecosystems (BCEs) has gained international attention in climate change mitigation, reflected in United Nations policies and voluntary carbon-offset projects. These efforts assume significant and uniform losses of soil organic carbon (C_org) throughout the top meter following disturbances, yet this assumption lacks robust empirical support. Here, we synthesized 239 paired observations of intact and disturbed BCEs globally. Soil C_org stock losses in the top meters vary widely: from −68.4% (agricultural conversion, ±13.4%, 95% confidence interval) to +0.8% (harvesting, ±46.2%) in mangroves, −25.9% (climate/hydrological change, ± 30.7%) to +48.6% (grazing, ±78.7%) in saltmarshes, and −34.2% (vegetation cover damage, ±22.4%) to −27.4% (dredging, ±33.6%) in seagrasses. Extensive disturbances deplete C_org down to 50–200 cm, while limited disturbances impact only the top 10–30 cm or resulted in negligible losses. This refinement contributes to improved global inventories of greenhouse gas emissions from BCEs, supporting abatement policy settings for nationally determined contributions commitments. © The Author(s) 2025.

关键词：

来源：评论

学校读者我要写书评

暂无评论

engineering a Whitlockite-Containing Macroporous Composite Cryogel with Silica Hybrid for Enhanced Vascularized Bone Regeneration

引用

ACS Applied Materials and Interfaces 2025年第21期17卷 30436-30453页

作者： Kuttappan, Shruthy Amirthalingam, Sivashanmugam Hennebert, Perrine M’Pemba Lee, Yoonho Ryu, Kyung Min Rajendran, Arun Kumar Kim, Jung Hun So, Kyoung-Ha Hwang, Nathaniel S. Jeon, Noo Li Institute of Advanced Machinery and Design Seoul National University Seoul 08826 South Korea Institute of Engineering Research Seoul National University Seoul 08826 South Korea School of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University Seoul 08826 South Korea Interdisciplinary Program in Bioengineering Seoul National University Seoul 08826 South Korea Bio-MAX/N-Bio Institute Institute of Bio-Engineering Seoul National University Seoul 08826 South Korea School of Mechanical Engineering Seoul National University Seoul 08826 South Korea Qureator Inc. San Diego 92121 CA United States

Recognizing the complexity of the bone regeneration cascade and understanding the adverse effects of using growth factors, it is crucial to develop a growth factor-free scaffold with multiple functions to modulate various aspects of the regenerative process. This study explores a novel macroporous multifunctional bone graft for bone regeneration, aiming to overcome complications associated with current treatment modalities. The study reveals enhanced bone regeneration and vascularization by integrating silica hybrid and nano-whitlockite (nWH) into cryogel-based composite scaffolds. The physicochemical properties, in vitro angiogenic and osteogenic potential, three-dimensional (3D) vasculogenesis, osteoclastogenesis, and proinflammatory responses of the composite cryogels were systematically examined. Results showed augmented effects for nWH-containing silica hybrid cryogels, particularly notable in the 1:0.5 WH2.5 group. Cryogels promoted angio- and vasculogenesis, and osteogenic differentiation while reducing osteoclast formation and proinflammatory responses in vitro. Optimal composition analysis consistently favored the 1:0.5 WH2.5 group. Implantation in a critical-sized cranial defect model in mice demonstrated enhanced vascularization and new bone formation. Thus, this study demonstrates the synergistic effect of silica hybrid and nWH in critical-sized bone defects. © 2025 American Chemical Society.

关键词： bone regeneration cryogel silica hybrid vascularization whitlockite

来源：评论

学校读者我要写书评

暂无评论

The sustainability of partial and total replacement of Ordinary Portland Cement: A deep dive into different concrete mixtures through life cycle assessment

引用

Journal of Building engineering 2025年 108卷

作者： Sbahieh, Sami McKay, Gordon Nurdiawati, Anissa Al-Ghamdi, Sami G. Division of Sustainable Development College of Science and Engineering Hamad Bin Khalifa University DohaP.O. Box 34110 Qatar Environmental Science and Engineering Program Biological and Environmental Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955 Saudi Arabia Thuwal 23955 Saudi Arabia

The construction sector significantly impacts environmental sustainability, with cement production being a major source of carbon emissions. Ordinary Portland Cement (OPC) manufacturing is highly energy-intensive due to limestone calcination and fossil fuel consumption. To mitigate these environmental effects, this study evaluates the sustainability of literature based alternative concrete mixtures through a Life Cycle Assessment (LCA), considering both partial and total cement replacement strategies. The study examines OPC blended with Supplementary Cementitious Materials (SCMs) such as fly ash (FA), silica fume (SF), metakaolin (MK), and ground granulated blast furnace slag (GGBS), as well as geopolymer concrete as a complete substitute for OPC. Findings indicate that SCMs significantly reduce the environmental footprint of OPC concrete, with GGBS-blended OPC achieving the highest CO2 reduction (28.7 %), followed by SF (28.3 %), FA (17.25 %), and MK (15.1 %). Geopolymer concrete demonstrated an even greater CO2 reduction, with FA-based and GGBS-based geopolymers reducing emissions by 67 % and 54 %, respectively. However, geopolymers showed higher environmental impacts in categories such as fossil depletion, human toxicity, and ozone depletion, mainly due to the production of sodium silicate and sodium hydroxide. Notably, MK-based geopolymer concrete exhibited the highest overall environmental burden, performing worse than OPC concrete in all impact categories. The results highlight that the optimal choice of concrete depends on specific environmental goals. SCM-blended OPC presents a feasible and effective solution for lowering CO2 emissions, while geopolymer concrete offers a more sustainable alternative if challenges related to chemical activators are addressed. This study underscores the importance of optimizing raw material sourcing, production processes, and transportation logistics to enhance the sustainability of concrete in real-world applications. © 2025

关键词： Geopolymer concrete

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：