检索结果-南通市图书馆

study of interfacial transition zones between magnesium phosphate cement and Portland cement concrete pavement

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2024年第3期11卷 523-537页

作者： Fei liu Baofeng Pan Changjun Zhou ge li Xiaocun Wang Jiaquan li Faculty of Infrastructure Engineering Dalian University of TechnologyDalian 116024China Tongren City Transportation Bureau Tongren 554300China Beijing Civil Aviation Design and Research Institute of China Design group Beijing 101318China

The Portland cement concrete pavement(PCCP)often suffers from different environmental distresses and vehicle load failure,resulting in slab corner fractures,potholes,and other *** repair has become one of the effective ways to open traffic *** this study,a novel type of rapid repair material,basalt fiber reinforced polymer modified magnesium phosphate cement(BFPmPC),is used to rapidly repair ***,the mechanical properties and characteristics of the repair interfaces which are named interfacial transition zones(ITZs)formed by BFPmPC and cement concrete are focused on as a decisive factor for the performance of the rapid *** changing trend of the elastic moduli was studied by nanoindentation experiments in the ITZs with the deconvolution analysis that the elastic moduli of certain kinds of substances can be *** experimental results show that the elastic modulus of ITZ-1 with a width of about20μm can be regarded as 0.098 times of the aggregate,and 0.51 times of the ordinary Portland cement(OPC)*** BFPmPC-OPC mortar ITZ has roughly the same mechanical properties as the ITZ between aggregate and BFPmPC.A multi-scale representative two-dimensional model was established by random aggregate and a two-dimensional extended finite element method(XFEm)to study the mechanical properties of the repair *** simulation results show that the ITZ formed by the interface of BFPmPC and OPC mortar and basalt aggregate is the most vulnerable to failure,which is consistent with the nano-indentation experimental results.

关键词： Portland cement concrete pavement Interfacial transition zone magnesium phosphate cement Repair interface Nanoindentation mechanical properties and characteristics

Potassium alleviated high nitrogen-induced apple growth inhibition by regulating photosynthetic nitrogen allocation and enhancing nitrogen utilization capacity

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2024年第1期10卷 1-14页

作者： Xinxiang Xu guangyuan liu Jingquan liu mengxue lyu Fen Wang Yue Xing Hao meng min li Yu Jiang ge Tian Zhanling Zhu Yuanmao Jiang shunfeng ge state Key laboratory of Crop Biology College of Horticulture Science and EngineeringShandong Agricultural UniversityTai'anShandong 271018China Key laboratory of Biochemistry and molecular Biology in Universities of shandong College of Biological and Agricultural EngineeringWeifang UniversityWeifangShandong 261061China

There is a close relationship between potassium(K)and nitrogen(N).However,the roles of K under high N conditions remain *** a hydroponics approach,we monitored the morphological,physiological,and molecular changes in m9T337 apple(malus domestica)rootstocks under different nitrate(10 and 30 mmol·l^(-1)NO_(3)^(-))and K supply(0.5,6,10,and 20 mmol·l_(-1)K^(+))*** revealed that high nitrate inhibited the root growth of m9T337 rootstocks,downregulated the expressions of K transporter genes(mdPT5,mdHKT1,and mdATK1),and reduced the net NO3-and K+influx at the surface of roots,thereby resulting in an N/K imbalance in *** investigation showed that 10 mmol·l^(-1)K increased the activity of N metabolic enzymes(NR,gs,NiR,and gOgAT),upregulated the expressions of genes related to nitrate uptake and transport(mdNRT1.1,mdNRT1.2,mdNRT1.5,and mdNRT2.4),promoted15N transport from the roots to the shoots,optimized leaf N distribution,and improved photosynthetic N utilization efficiency under high nitrate *** results suggest that the negative effects of high nitrate may be related to the N/K imbalance and that reducing N/K in plants by increasing K supply level can effectively alleviate the inhibition of N assimilation by high nitrate stress.

关键词： Apple rootstock K level High nitrate stress N metabolism ^(15)N

Knockout of a rice K5.2 gene increases Ca accumulation in the grain

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2024年第2期66卷 252-264页

作者： Peitong Wang Naoki Yamaji Namiki mitani-Ueno Jun ge Jian Feng ma National Key laboratory of Crop genetics&germplasm Enhancement and Utilization College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095China Institute of Plant science and Resources Okayama UniversityKurashiki 710-0046Japan

Rice is a staple food for half of the world’s population,but it is a poor dietary source of calcium(Ca)due to the low *** is an important issue to boost Ca concentration in this grain to improve Ca deficiency risk,but the mechanisms underlying Ca accumulation are poorly ***,we obtained a rice(Oryza sativa)mutant with high shoot Ca *** mutant exhibited 26%-53% higher Ca in shoots than did wild-type rice(WT)at different Ca *** concentration in the xylem sap was 36% higher in the mutant than in the *** was no difference in agronomic traits between the WT and mutant,but the mutant showed 25% higher Ca in the polished grain compared with the ***-based cloning combined with a complementation test revealed that the mutant phenotype was caused by an 18-bp deletion of a gene,OsK5.2,belonging to the shaker-like K+channel ***5.2 was highly expressed in the mature region of the roots and its expression in the roots was not affected by Ca levels,but upregulated by low *** showed that OsK5.2 was mainly expressed in the pericycle of the *** together,our results revealed a novel role for OsK5.2 in Ca translocation in rice,and will be a good target for Ca biofortification in rice.

关键词： accumulation biofortification calcium OsK5.2 pericycle rice translocation

magnesium oxide(mgO)nanoadsorbents in wastewater treatment:A comprehensive review

在线全文

学校读者我要写书评

暂无评论

Journal of magnesium and Alloys 2024年第5期12卷 1709-1773页

作者： H.C.s.Perera V.gurunanthanan Anoop singh m.m.m.g.P.g.mantilaka g.Das sandeep Arya Department of Physics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postgraduate Institute of science University of PeradeniyaPeradeniyaSri Lanka Department of Humanities and sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India Centre for global Health Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Department of Physics University of JammuJammu and Kashmir180006India

Wastewater contamination by heavy metals and synthetic dyes presents a significant environmental challenge,necessitating effective and sustainable separation *** review article provides a detailed examination of magnesium oxide(mgO)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with a specific focus on heavy metal and dye *** review comprehensively explores various aspects of mgO nanoparticles,including their structural characteristics and synthesis *** article delves into the morphology and crystallographic arrangement of mgO nanoparticles,offering insights into their structural *** the complexity of adsorption processes,the review identifies and analyzes parameters influencing the adsorption efficiency of mgO nanoparticles,such as temperature,pH,contact time,initial concentration,and co-existing *** interplay between these parameters and the adsorption capability of mgO nanoparticles emphasizes the importance of optimizing operational ***,the review assesses various synthesis methods for mgO nanoparticles,including sol-gel,hydrothermal,precipitation,green synthesis,solvothermal,and template-assisted *** discusses the advantages,limitations,and resulting nanoparticle characteristics of each method,enabling readers to grasp the implications of synthesis processes on adsorption *** comprehensive review consolidates current insights into the effectiveness of mgO nanoparticles as a potent nanoadsorbent for removing heavy metals and dyes from wastewater covering a wide spectrum of aspects related to mgO ***,there is a need to investigate the use of mgO in the treatment of actual wastewater or river water,in order to leverage its cost-effectiveness and high efficiency for practical water treatment applications in real-time.

关键词： mgO nanoparticles Nanoadsorbent Wastewater treatment Heavy metals Dye separation Adsorption synthesis methods

Paradigm for Determining the Optimal Ultradeep and superthick saline Aquifer for High-TDs mine Water geological storage

在线全文

学校读者我要写书评

暂无评论

Acta geologica sinica(English Edition) 2024年第3期98卷 771-785页

作者： lI Xin CHEN ge XU Zhimin lIU Qi CHEN Tianci sUN Yajun school of Resources and geosciences China University of Mining and TechnologyXuzhouJiangsu 221116China National Professional Central laboratory of Basic Research on mine Water Disaster Prevention and Control Technology XuzhouJiangsu 221116China

saline aquifers are the most popular waste and CO_(2)injection and storage reservoirs *** project proposes that several optimal injection positions should be investigated as hydraulic pressure-focused positions,in order to relieve the high demands of pump *** comprehensive indices(F_(i))representing the injectivity of different burial depths were obtained by using information entropy,based on the mercury injection experimental data of 13 rock *** results demonstrated that the burial depths of No.4,No.1 and No.2 in the liujiagou Formation were the most suitable positions for hydraulic focused injection,which means the upper 30 m thickness could be regarded as the hydraulic focused range in the saline aquifer with an average thickness of 400 *** addition,some laboratory experiments and in situ tests were carried out for the purpose of certifying and analyzing results,including sEm,XRD,brittleness index and *** results suggested that the rock samples at the No.4,No.1 and No.2 burial depth ranges have loose microstructure,weak cementation,as well as dual pores and *** lithology is mainly quartz and feldspar,but the clay mineral content is high(10%-25%),which is positive for *** lithology is suitable for hydraulic fracturing to form extended cracks and micro-fissures during high-TDs(total dissolved solids)mine water injection,because of the high brittleness ***,a theoretical and technical framework for high-TDs mine water injection was established,based on operating pilot *** theoretical defects and drawbacks learned from the field practices were summarized and solutions *** research in this study could provide guidance and a paradigm for the inexpensive treatment of high-TDs mine water by injection and storage.

关键词： ultradeep liujiagou Formation high-TDs mine water optimal hydraulic injection positions information entropy reservoir spatial characteristics

laboratory and field evaluation of a low-cost optical particle sizer

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental sciences 2024年第8期142卷 215-225页

作者： mingzhen Tang Yicheng shen Yanzhen ge Jian gao Chong Wang liqing Wu shuchun si state Key laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China Jinan grid-Based supervision Center of Ecological and Environmental Protection Jinan 250100China Tai’an Ecological Environment Protection Control Center Tai’an 271000China school of Physics Shandong UniversityJinan 250013China

low-cost sensors are widely used to collect high-spatial-resolution particulate matter data that traditional reference monitoring devices *** addition to the mass concentration,the number concentration and size distribution are also fundamental in determining the origin and hazard level of particulate ***,low-cost optical sensors have been improved to establish optical particle sizers(OPss).In this study,a low-cost OPs,the Nova sDs029,is introduced,and it is evaluated in comparison to two reference instruments—the gRImm 11-D and the TsI *** first tested the sizing accuracy using polystyrene latex ***,we assessed the mass and number size distribution accuracy in three application scenarios:indoor smoking,ambient air quality,and mobile *** evaluations suggest that the low-cost sDs029 rivals research-grade optical sizers in many *** example,(1)the particle diameters obtained with the sDs029 are close to the reference instruments(usuallym range;(2)the number of particles and mass concentration are highly correlated(r≥0.99)with the values obtained with the reference instruments;and(3)the sDs029 slightly underestimates the number concentration,but the derived Pm_(2.5)values are closer to monitoring station than the reference *** successful application of the sDs029 in multiple scenarios suggests that a plausible particle size distribution can be obtained in an easy and cost-efficient *** believe that low-cost OPss will increasingly be used to map the sources and risk levels of particles at the city scale.

关键词： Optical particle sizer Particle size distribution low-cost sensor Evaluation Field application

Detoxification strategy of microcystis aeruginosa to the toxicity of Cd(Ⅱ):role of EPs in alleviating toxicity

在线全文

学校读者我要写书评

暂无评论

Journal of Oceanology and limnology 2024年第3期42卷 802-815页

作者： Xingye HAN Fangyuan lIU Yibo ZHANg Kai CHENg Heyun WANg Hongmei ge Innovation Demonstration Base of Ecological Environment geotechnical and Ecological Restoration of Rivers and lakes School of Civil EngineeringArchitecture and EnvironmentHubei University of TechnologyWuhan 430068China school of Environmental science and Engineering Huazhong University of Science and TechnologyWuhan 430074China National Engineering Research Center of Advanced Technology and Equipment for Water Environment Pollution monitoring Wuhan 430068China

Although many studies have found that cadmium(Cd)can be toxic to microalgae,only a few reports focused on the role of extracellular polymeric substances(EPs)in Cd(Ⅱ)*** biochemical and physiological endpoints of microcystis aeruginosa,including the composition and functional groups of soluble EPs(sl-EPs),loosely bound EPs(lB-EPs),and tightly bound EPs(TB-EPs),were detected to elucidate the toxicity and detoxification mechanisms of Cd(Ⅱ)for *** and physiological assays on *** showed that the 0.25-mg/l Cd(Ⅱ)resulted in a larger inhibition on growth and F_(v)/F_(m).Nevertheless,Cd(Ⅱ)significantly induced much higher contents of superoxide dismutase(sOD),intracellular microcystin lR(mC-lR),extracellular mC-lR,and *** electron microscopy with energy dispersive X-ray spectroscopy confirmed that Cd(Ⅱ)was absorbed into the EPs *** transform infrared spectrum analysis revealed that the functional groups bound with Cd(Ⅱ)of algae biomass,sl-EPs,lB-EPs,and TB-EPs were somewhat *** C=O/C=N groups ofδ-lactam or protein were their prominent functional groups,suggesting that amide or proteins in the EPs played a key role in the adsorption in Cd(Ⅱ).The concentration of 0.25 mg/l of Cd(Ⅱ)may change the chemical structure of EPs by altering the production of protein-like substances containing *** study indicated that *** could detoxify Cd(Ⅱ)stress via induction of antioxidant capacity(higher sOD activity and mC synthesis),EPs production,and modification in chemical structure of EPs.

关键词： microcystis aeruginosa cadmium extracellular polymeric substances(EPs) microcystin detoxification

Audio-Text multimodal speech Recognition via Dual-Tower Architecture for mandarin Air Traffic Control Communications

在线全文

学校读者我要写书评

暂无评论

Computers, materials & Continua 2024年第3期78卷 3215-3245页

作者： shuting ge Jin Ren Yihua shi Yujun Zhang shunzhi Yang Jinfeng Yang school of Computer science and software Engineering University of Science and Technology LiaoningAnshan114051China Institute of Applied Artificial Intelligence of the guangdong-Hong Kong-macao greater Bay Area Shenzhen Polytechnic UniversityShenzhen518055China shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen518055China Industrial Training Centre Shenzhen Polytechnic UniversityShenzhen518055China

In air traffic control communications (ATCC), misunderstandings between pilots and controllers could result in fatal aviation accidents. Fortunately, advanced automatic speech recognition technology has emerged as a promising means of preventing miscommunications and enhancing aviation safety. However, most existing speech recognition methods merely incorporate external language models on the decoder side, leading to insufficient semantic alignment between speech and text modalities during the encoding phase. Furthermore, it is challenging to model acoustic context dependencies over long distances due to the longer speech sequences than text, especially for the extended ATCC data. To address these issues, we propose a speech-text multimodal dual-tower architecture for speech recognition. It employs cross-modal interactions to achieve close semantic alignment during the encoding stage and strengthen its capabilities in modeling auditory long-distance context dependencies. In addition, a two-stage training strategy is elaborately devised to derive semantics-aware acoustic representations effectively. The first stage focuses on pre-training the speech-text multimodal encoding module to enhance inter-modal semantic alignment and aural long-distance context dependencies. The second stage fine-tunes the entire network to bridge the input modality variation gap between the training and inference phases and boost generalization performance. Extensive experiments demonstrate the effectiveness of the proposed speech-text multimodal speech recognition method on the ATCC and AIsHEll-1 datasets. It reduces the character error rate to 6.54% and 8.73%, respectively, and exhibits substantial performance gains of 28.76% and 23.82% compared with the best baseline model. The case studies indicate that the obtained semantics-aware acoustic representations aid in accurately recognizing terms with similar pronunciations but distinctive semantics. The research provides a novel modeling pa

关键词： speech-text multimodal automatic speech recognition semantic alignment air traffic control communications dual-tower architecture

Analysis of blocking slurry diffusion parameters for a new self-starting drainage anchor cable

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Earth science 2024年

作者： WANg Xu ge Qi lü Chengcheng sHU Junwei sUN Hongyue sino-Italy Ningbo Ecological Park Holding group Co.，ltd Ocean College， Zhejiang University College of Civil Engineering and Architecture， Zhejiang University school of Civil Engineering， Nanjing Forestry University

A new self-starting drainage anchor that combines prestressed anchor cables with self-starting drainage is proposed. The novelty of the self-starting drainage method is the realization of the drainage and anchoring in the one inclined borehole. Reduction in the number of boreholes can greatly decrease the construction cost and duration of the project. The adverse effect of drilling construction disturbance on the slope is reduced. To tackle the possible blockage of the drainage cavity due to slurry leakage during the solidification process after finishing grouting in the blocking section. To this end， a theoretical equation for the slurry diffusion radius under slurry self-weight pressure boundary conditions is deduced. The result is verified for precision through comparison with numerical simulation. The findings reveal that the permeability coefficient of rock and soil mass makes the most significant impact on the slurry diffusion radius， succeeded by the length of the grouting blocking section， slurry initial setting time， and drilling inclination in descending order of influence. With the 5% mass ratio of a "711" type slurry quick-setting agent， the maximum slurry diffusion radius can be reduced from 0.925m to 0.449m， a reduction of 0.476m， which is comparatively more recommended.

关键词：