摘要：
The Swida wilsoniana, a remarkable woody oil tree species of immense ecological and economic significance, encounters limitations in its production within southern China due to the scarcity of available phosphorus (AP) in red soil. In this study, we employed methods encompassing microbial diversity and metagenomic analysis to explore the composition as well as functional disparities among rhizosphere microbial communities associated with S. wilsoniana exhibiting varying growth potentials in red soil. In this study, microbial diversity and metagenomic analysis methods were used to investigate the composition of and functional differences among the rhizosphere microbial communities of S. wilsoniana with different growth potential in red soil. The results showed that the AP content of the rhizosphere soil of dominant trees (DTs) was higher than that of recessive trees (RTs). Three dominant phyla were identified in the rhizosphere soil of S. wilsoniana, including Proteobacteria, Actinobacteria, and Acidobacteria. Fifteen microbial communities involved in 23 metabolic activities were significantly correlated with AP content (P <= 0.05). A total of 55 strains of phosphorus-solubilizing bacteria were isolated from the rhizosphere soil of S. wilsoniana. Among these, SwB16 exhibited the highest efficiency in solubilizing phosphorus, with a phosphorus solubilization capacity of up to 347.23 mg & sdot;L- 1. Pot experiments showed that SwB16 has the potential to promote plant growth and therefore could be used as a biofertilizer for S. wilsoniana.
摘要：
This paper proposes a pre-processing method for heart sound screening and extracts the high-order spectral feature of phonocardiogram. Moreover, a multi-convolutional neural network (mCNN) is constructed to achieve the classification of normal, aortic stenosis, mitral regurgitation, mitral stenosis, and mitral valve prolapse. First, the heart sound recordings are down-sampled, denoised by wavelet transform, and normalized. Second, a new heart sound screening algorithm is proposed. The waveform of the heart sound recording is segmented and saved as an image which is performed by the gray-scale processing to calculate the amplitude of the heart sound. The extremely noisy heart sound segments are screened out based on the amplitude information, and the remaining heart sound segments are spliced as pure heart sound recordings. After 50% superposition segmentation of the heart sound recordings, high-order spectral features are extracted and image data are stored. Finally, a 34-layer mCNN is specifically designed to boost the performance of heart sound classification through multi-layer dimensionality reduction. Experimental results show that the proposed method has superior performance compared with the existing one. For the two-category dataset, the accuracy with and without PCG screening is 97.99% and 99.42%, respectively. For the five-category dataset, the average accuracy is 99%.
摘要：
Graphene, as a highly promising electrode material, has garnered significant attentions due to its remarkable properties. Nevertheless, challenges persist in its commercial application in the field of energy storage and conversion, including easy stacking, inert surface and limited yield. Rational regulation of the morphology, structure and composition of graphene is demonstrated as an effective way to conquer these challenges. Herein, we adopt a facile spray pyrolysis method to achieve large-scale synthesis of 3D crumpled N, O co-doped graphene nanosheets (NO-GNs). By comprehensive characterization and analysis, it is witnessed that our prepared NO-GNs possess unique 3D crumpled morphology as well as abundant structure defects, and achieve successful co-doping of N and O atoms. These optimized morphology, structure and composition effectively increase the specific surface area and substantially enhance the hydrophilicity and reactive activity of NO-GNs, thus leading to markedly improved electrochemical performance towards supercapacitor and oxygen reduction reaction. Evidently, the preparation of NO-GNs not only offers a promising material for advanced energy storage and conversion systems, but also presents a novel but versatile strategy for manufacturing high-performance carbon-based electrodes.
关键词：
deep learning;object detection;waste-to-energy power plants;abnormal waste detection;YOLOv5;production safety
摘要：
Due to the danger of explosive, oversize and poison-induced abnormal waste and the complex conditions in waste-to-energy power plants (WtEPPs), the manual inspection and existing waste detection algorithms are incapable to meet the requirement of both high accuracy and efficiency. To address the issues, we propose the Waste-YOLO framework by introducing the coordinate attention, convolutional block attention module, content-aware reassembly of features, improved bidirectional feature pyramid network and SCYLLA- intersection over union loss function based on YOLOv5s for high accuracy real-time abnormal waste detection. Through video acquisition, frame-splitting, manual annotation and data augmentation, we develop an abnormal waste image dataset with the four most common types (i.e. gas cans, mattresses, wood and iron sheets) to evaluate the proposed Waste-YOLO. Extensive experimental results demonstrate the superiority of Waste-YOLO to several state-of-the-art algorithms in waste detection effectiveness and efficiency to ensure production safety in WtEPPs.
摘要：
Ammonia (NH3) volatilization from agricultural lands is a main source of atmospheric reduced nitrogen species (NHx). Accurately quantifying its contribution to regional atmospheric NHx deposition is critical for controlling regional air nitrogen pollution. The stable nitrogen isotope composition (expressed by delta N-15) is a promising indicator to trace atmospheric NHx sources, presupposing a reliable nitrogen isotopic signature of NH3 emission sources. To obtain more specific seasonal delta N-15 values of soil NH3 volatilization for reliable regional seasonal NH3 source partitioning, we utilized an active dynamic sampling technique to measure the delta N-15-NH3 values volatilized from maize cropping land in northeast China. These values varied from -38.0 to -0.2 parts per thousand, with a significantly lower rate-weighted value observed in the early period (May-June, -30.5 +/- 6.7 parts per thousand) as compared with the late period (July-October, -8.5 +/- 4.3 parts per thousand). Seasonal delta N-15-NH3 variations were related to the main NH3 production pathway, degree of soil ammonium consumption, and soil environment. Bayesian isotope mixing model analysis revealed that without considering the seasonal delta N-15 variation in soil-volatilized NH3 could result in an overestimate by up to absolute 38% for agricultural volatile NH3 to regional atmospheric bulk ammonium deposition during July-October, further demonstrating that it is essential to distinguish seasonal delta N-15 profile of agricultural volatile NH3 in regional source apportionment.
摘要：
Direct synthesis of butadiene (BD) from aqueous ethanol is a promising route, but the development of novel supports and the yield of BD still confronts significant challenges. Herein, we report the green and rapid synthesis method of hierarchical nano-sized pure Si-Beta zeolite, which drastically reduces the crystallization time and avoids the use of HF as well as the generation of large amounts of wastewater compared to the conventional pure Si-Beta zeolite synthesis. Meanwhile, the synthesized hierarchical nano-sized pure Si-Beta zeolite supported with Zn and Y achieved more than 60 % for BD selectivity and ethanol conversion of 98 % at 350 degrees C and 0.57 h-1. The hierarchical nano-sized structure of ZnY/Si-Beta effectively promoted synergistic effect of Zn and Y species and modified the acid-base properties to maximize the production of BD from aqueous ethanol. More importantly, the catalytic performance was superior to that of the reported commercial pure Si-Beta catalytic system.
期刊：
Process Safety and Environmental Protection,2024年182:405-415 ISSN：0957-5820
通讯作者：
Xu, T
作者机构：
[Tang, Xiting; Zeng, Zhen] Cent South Univ Forestry & Technol, Sch Life Sci & technol, Changsha 410004, Peoples R China.;[Xu, T; Zhou, Yihui; Xu, Tao] Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.;[Wu, Qingyu; Liu, Kang; Hu, Simeng] Cent South Univ Forestry & Technol, Coll Environm Sci & Engn, Changsha 410004, Peoples R China.;[Xu, Tao; Yu, Gang] Hunan Univ, Coll Chem & Chem Engn, Changsha 410082, Peoples R China.;[Zhou, Yihui; He, Miao] Aerosp Kaitian Environm Technol Co Ltd, Changsha 410100, Peoples R China.
通讯机构：
[Xu, T ] C;Cent South Univ Forestry & Technol, Coll Sci, Changsha 410004, Peoples R China.
关键词：
Sinusoidal alternating current coagulation;Heavy metal ions;Process evaluation;Adsorption behavior;Removal mechanism
摘要：
A novel photovoltaic energy-sinusoidal alternating current coagulation (PE-SACC) system was proposed for the removal of heavy metal ions (HMs) in electroplating wastewater. A response surface methodology was used to study the combined effect of two factors on removal efficiency (Re) and energy consumption (EEC), and the optimal process parameters were obtained. The morphology, surface element content, crystal structure, and chemical composition of the flocs generated during the electrocoagulation (EC) process were characterized using SEM, EDS, XRD, FTIR, and XPS techniques. The intra-particle diffusion model was used to describe the adsorption behavior of HMs (Cu2+, Zn2+ and Ni2+) by flocs. Finally, the removal mechanism of HMs by SACC technology and its application in actual wastewater treatment were discussed in detail. The results revealed that when c(0)(Ni2+) = c(0)(Zn2+) = c(0)(Cu2+) = 50 mg.dm(-3), c (Cl ) over bar = 100 mg.dm(-3), pH(0) = 10, j = 1.3 A.m(-2), t = 85 min, the Re(Cu2+), Re(Zn2+) and Re(Ni2+) were 99.3%, 99.1%, and 98.4%, respectively, and the EEC was 0.105 kWh.m(-3). Compared with the traditional direct current coagulation (DCC), EEC, electrode consumption, and sludge production in SACC mode were reduced by 37.1%, 62.2%, and 66.6%, respectively. The PE-SACC system achieved ultra-low cost treatment of heavy metal electroplating wastewater. The adsorption process included surface adsorption, pore adsorption, and adsorption equilibrium. The mechanisms for the removal of HMs included cathode reduction, alkaline precipitation, and adsorption. In the actual wastewater treatment process, the removal efficiency of HMs could still be maintained above 99%, and the effluent met the national discharge standard (GB 31574-2015). This study presented an economically and environmentally sustainable approach for the evolution and industrial utilization of novel electrocoagulation technologies.
摘要：
The cutting vibration generated by cutting forces is critical to the accuracy and efficiency of face-hobbed hypoid gears. However, few relevant works are currently on cutting dynamics modeling for the face-hobbing process due to its complex spatial relationships. This study developed an efficient cutting dynamics model considering comprehensive characteristics of the non-generated face-hobbed hypoid gear machining process. A concise and efficient analytical solution to cutting dynamics modeling for face-hobbing of hypoid gears is obtained by using a vectorization method to characterize chip regenerating mechanisms. The machine tool vibration caused by cutting forces is predicted and validated according to an industrial case study. The proposed cutting dynamic model is 36.11% more efficient than the semi-analytical dynamic model derived from other cutting force prediction methods, and its accuracy is also improved with an error of less than 15%. Furthermore, the proposed vectorization solution to face-hobbing cutting dynamics modeling will be a practicable and effective method for analyzing the chatter in the machining of complex surfaces.
作者机构：
[Wen, Zhixin; Wen, ZX; Song, Gang; Yang, Qisen; Cheng, Jilong; Yang, QS; Qu, Yanhua; Feijo, Anderson; Lv, Yonglei; Xia, Lin; Cui, Yaqian; Ge, Deyan] Chinese Acad Sci, Inst Zool, Key Lab Zool Systemat & Evolut, Beijing 100101, Peoples R China.;[Xie, Wendong; Lv, Yonglei; Cui, Yaqian] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Pubu, Dunzhu; Dan, Zeng; Hu, Jingjing; Lv, Yonglei; Wu, Erning] Forestry Inventory & Planning Inst Tibet Autonomou, Lhasa 850000, Peoples R China.;[Feijo, Anderson] Field Museum Nat Hist, Negaunee Integrat Res Ctr, Chicago, IL 60605 USA.;[Guo, Keji] Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Peoples R China.
通讯机构：
[Wen, ZX ; Wang, B ; Yang, QS] C;Chinese Acad Sci, Inst Zool, Key Lab Zool Systemat & Evolut, Beijing 100101, Peoples R China.;China West Normal Univ, Key Lab Southwest China Wildlife Resources Conserv, Minist Educ, Nanchong 637002, Peoples R China.
摘要：
Conservation planning in areas prone to human-wildlife interactions requires strong integration between biodiversity protection and other human society needs. Livestock depredation by felids is one of the most reported human-wildlife conflicts in Tibet, reinforced by expanding rangeland and rebounding of wildlife populations. Tibet harbors the richest felid diversity in China; nevertheless, only two protected areas were designated targeting this emblematic group. Here, we combined species distribution modeling and systematic conservation planning approaches to identify priority areas for felid conservation in Tibet. Specifically, we assessed conservation priorities based on three complementary biodiversity indexes (taxonomic, functional, and phylogenetic) integrated with livestock density, land use, and human disturbances. Based on the most comprehensive dataset of felid species, we found that large parts of Tibet remain poorly studied and most of the felid populations inhabit unprotected Tibetan lands. In addition, we detected that livestock density is positively related to large-sized felid distributions, reflecting the long-term conflict in this region. Our prioritization analyses identified large priority areas for felid conservation in Tibet. Worrisomely, approximately 76% of them lie outside of existing and planned protected areas, with four noteworthy gaps. The largest extension of these key regions for felid conservation is located in southeastern Tibet close to the border with India, Bhutan, and Nepal, revealing the need for transnational conservation efforts across the Pan -Himalaya region. Our study represents the first attempt of systematic conservation planning for Tibetan felids taking into account the balance between multiple conservation values and competing land use for societal development.
作者机构：
[Yan, Hongyu; Xie, Suchao; Jing, Kunkun; Wang, Hao] Cent South Univ, Key Lab Traff Safety Track, Minist Educ, Changsha, Peoples R China.;[Yan, Hongyu; Xie, Suchao; Jing, Kunkun; Wang, Hao] Cent South Univ, Sch Traff & Transportat Engn, Changsha, Peoples R China.;[Zhou, Hui] Cent South Univ Forestry & Technol, Sch Logist & Transportat, Changsha, Peoples R China.;[Xie, SC; Xie, Suchao] Cent South Univ, Key Lab Traff Safety Track, Minist Educ, Changsha 410075, Peoples R China.
通讯机构：
[Xie, SC ] C;Cent South Univ, Key Lab Traff Safety Track, Minist Educ, Changsha 410075, Peoples R China.
关键词：
dual-scale RVE model;homogenization analysis;visualization and adjustment of elastic modulus
摘要：
Utilizing computer tomography (CT) to obtain detailed parameter models, we established a dual‐scale model comprising experimentally validated microscopic (RVE) and macroscopic RVE. We assessed the impact of yarn fiber volume fraction and weaving distance on the elastic properties of the yarn and provided a formula that combines these two factors to adjust the in‐plane orthogonal Young's modulus. Abstract Three‐dimensional (3D) orthogonal woven composites can overcome the drawback of weak interlaminar strengths in traditional laminated composites and exhibit excellent resistance to out‐of‐plane impact, however, the significant difference in properties in the in‐plane orthogonal direction will limit the potential range of application thereof. Predicting elastic properties and exploring methods of adjustment are therefore of paramount importance. Using computed tomography (CT) scanning to obtain detailed parameter models, a corresponding dual‐scale model of microscopic representative volume element (RVE) and mesoscopic RVE was established, and the accuracy of the model was experimentally validated, which can predict the elastic properties of materials. In addition, the influences of the yarn fiber volume fraction and weaving distance on elastic properties were evaluated using the elastic modulus visualization method, and a formula integrating these two factors is provided for adjustment of the in‐plane orthogonal Young's modulus. Highlights Experimentally validated microscale and mesoscale RVE models were established. The influences of factors on elastic properties were visualized. The relationship between Young's modulus and influencing factors was derived. A reliable strategy for adjusting the in‐plane Young's modulus was proposed.
摘要：
Tarsiger indicus (Vieillot, 1817), the White-browed Bush Robin, is a small passerine bird widely distributed in Asian countries. Here, we successfully sequenced its mitogenome using the Illumina Novaseq 6000 platform (Illumina, San Diego, CA, USA) for PE 2 × 150 bp sequencing. Combined with other published mitogenomes, we conducted the first comprehensive comparative mitogenome analysis of Muscicapidae birds and reconstructed the phylogenetic relationships between Muscicapidae and related groups. The T. indicus mitogenome was 16,723 bp in size, and it possessed the typical avian mitogenome structure and organization. Most PCGs of T. indicus were initiated strictly with the typical start codon ATG, while COX1 and ND2 were started with GTG. RSCU statistics showed that CUA, CGA, and GCC were relatively high frequency in the T. indicus mitogenome. T. cyanurus and T. indicus shared very similar mitogenomic features. All 13 PCGs of Muscicapidae mitogenomes had experienced purifying selection. Specifically, ATP8 had the highest rate of evolution (0.13296), whereas COX1 had the lowest (0.01373). The monophylies of Muscicapidae, Turdidae, and Paradoxornithidae were strongly supported. The clade of ((Muscicapidae + Turdidae) + Sturnidae) in Passeriformes was supported by both Bayesian Inference and Maximum likelihood analyses. The latest taxonomic status of many passerine birds with complex taxonomic histories were also supported. For example, Monticola gularis, T. indicus, and T. cyanurus were allocated to Turdidae in other literature; our phylogenetic topologies clearly supported their membership in Muscicapidae; Paradoxornis heudei, Suthora webbiana, S. nipalensis, and S. fulvifrons were formerly classified into Muscicapidae; we supported their membership in Paradoxornithidae; Culicicapa ceylonensis was originally classified as a member of Muscicapidae; our results are consistent with a position in Stenostiridae. Our study enriches the genetic data of T. indicus and provides new insights into the molecular phylogeny and evolution of passerine birds.
摘要：
Climate change has intensified the effects of habitat fragmentation in many ecosystems, particularly exacerbated in riparian habitats. Therefore, there is an urgent need to identify keystone connectivity spots to ensure long-term conservation and sustainable management of riparian systems as they play a crucial role for landscape connectivity. This paper aims to identify critical areas for connectivity under two contrasting climate change scenarios (RCP 4.5 and RCP 8.5 models) for the years 2030, 2050 and 2100 and to group these critical areas by similar connectivity in keystone spots for sustainable management. A set of analyses comprising climate analysis, drainage network analysis, configuration of potential riparian habitats, riparian habitat connectivity, data clustering, and statistical analysis within a Spanish river basin (NW Spain) were applied. The node and link connectivity would be reduced under the two climate change scenarios (≈2.5 % and 4.4 % reduction, respectively), intensifying riparian habitat fragmentation. Furthermore, 51 different clusters (critical areas) were obtained and classified in five classes (keystone spots) with similar connectivity across the different scenarios of climate change. Each keystone spot obtained by hierarchical classification was associated with one or more climate scenarios. One of these keystone spots was especially susceptible to the worst climate change scenario. Key riparian connectivity spots will be crucial for the management and restoration of highly threatened riparian systems and to ensure long-term biodiversity conservation.
摘要：
Quercus glauca is a valuable natural resource with both economic and ecological values. It is one of the dominant forest tree species widely distributed in Southern China. As a perennial broadleaf plant, Q. glauca inevitably encounters numerous stresses from environment. Glutaredoxins (GRXs) are a kind of small oxidoreductases that play an important role in response to oxidative stress. CC-type GRXs also known as ROXYs are specific to land plants. In this study, we isolated a CC-type GRX gene, QgROXY1, from Q. glauca. Expression of QgROXY1 is induced by a variety of environmental stimuli. QgROXY1 protein localizes to both cytoplasm and nucleus; whereas the nucleus localized QgROXY1 could physically interact with the basic region/leucine zipper motif (bZIP) transcription factor AtTGA2 from Arabidopsis thaliana. Transgenic A. thaliana ectopically expressing QgROXY1 is hypersensitive to exogenously applied salicylic acid. Induction of plant defense gene is significantly impaired in QgROXY1 transgenic plants that results in enhanced susceptibility to infection of Botrytis cinerea pathogen, indicating the evolutionary conserved function among ROXY homologs in weedy and woody plants. This is the first described function for the ROXYs in tree plants. Through this case study, we demonstrated the feasibility and efficacy of molecular technology applied to characterization of gene function in tree species.
期刊：
Journal of Cleaner Production,2024年434:140188 ISSN：0959-6526
通讯作者：
Zhang, DZ
作者机构：
[Ji, Bin; Zhou, Saiqi; Zhang, Dezhi; Zhou, Shaoyu; Zhang, DZ; Zhou, Likun] Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China.;[Li, Shuangyan] Cent South Univ Forestry & Technol, Coll Logist & Transportat, Changsha 410004, Hunan, Peoples R China.;[Zhou, Likun] Shanghai Wanxin Informat Technol Co Ltd, Shanghai 200441, Peoples R China.
通讯机构：
[Zhang, DZ ] C;Cent South Univ, Sch Traff & Transportat Engn, Changsha 410075, Hunan, Peoples R China.
关键词：
Electric vehicle;Energy consumption saving;Vehicle routing and scheduling;Mixed integer linear programming;Variable neighborhood search
摘要：
As an emerging and sustainable technology, electric vehicles (EVs) are becoming increasingly popular in the transportation system. However, they still have limitations in terms of energy capacity and high consumption. By implementing flexible scheduling for EV routings, it is hoped that improved efficiency and saved energy consumption can be achieved. This paper focuses on studying a time-dependent electric vehicle routing and scheduling problem with time windows (TDEVRSPTW). The goal is to minimize the total cost of energy consumption, travel distance, and the number of EVs, while considering vehicle travel process scheduling that allows stops at any nodes and along any arcs during periods of time-dependent congestion. For the first time, a mixed integer linear programming model is formulated for the problem, allowing for optimal solutions to small-scale problems using CPLEX. Meanwhile, a variable neighborhood search with partial model (VNS-PM) method is developed to handle the large-scale problem with 200 customers and obtain effective solutions. The numerical experiments demonstrate significant savings in energy consumption by the vehicle travel process scheduling. The proposed method further validates its strong performance by finding 11 new best solutions out of the 56 related EVRPTW benchmark instances. In addition, a case study is conducted to verify the application and energy consumption savings of the proposed problem, which also derives some additional recommendations by sensitivity analysis.
摘要：
Previous studies on production scheduling predominantly focus on developing optimal production plans in the context of deterministic customer requirements, achieving certain optimization goals related to the manufacturer. However, little research has been conducted on scheduling customized spare parts manufacturing on the supply side and equipment operation strategy on the demand side simultaneously. In real-world engineering projects, an efficient collaborative scheduling solution not only helps the manufacturer develop optimal production plans for critical spare parts, but also guides equipment users to achieve maximum output. Therefore, this paper studies a collaborative scheduling problem that both considers energy-saving spare parts manufacturing in a flexible job shop and equipment operation strategy of distributed users. To solve this problem effectively, a self-adaptive two-stage memetic algorithm (STMA) is proposed to minizine total energy consumption of the manufacturer and maximize total operation utility of equipment simultaneously. In detail, four heuristic rules are designed to generate a high-quality initial population. In the first stage, the crossover and mutation are utilized for global exploration, and a self-adaptive local search operator is presented to enhance the local development ability of the STMA. In the second stage, several energy-saving and utility-improving strategies are proposed to further optimize the Pareto front solutions generated in the previous period. Extensive experiments are conducted, and the numerical results indicate that STMA is the most promising compared to other well-known algorithms.
期刊：
FRONTIERS IN EARTH SCIENCE,2024年12:1308426 ISSN：2296-6463
通讯作者：
Chen, GD
作者机构：
[Chen, Guodong; Chen, Guanghuan; Chen, GD; Liu, Zhankun] Shandong Inst Geol Sci, MNR Key Lab Gold Mineralizat Proc & Resources Util, Shandong Key Lab Mineralizat Geol Proc & Resources, Jinan, Peoples R China.;[Chen, Yudong; Hao, Zihe; Zhong, Huiting; Chen, Guodong; Jiang, Liqun; Chen, Guanghuan; Chen, GD; Liu, Zhankun] Cent South Univ, Sch Geosci & Info Phys, Key Lab Metallogen Predict Nonferrous Met & Geol E, Minist Educ, Changsha, Peoples R China.;[Chen, Yudong; Hao, Zihe; Zhong, Huiting; Chen, Guodong; Jiang, Liqun; Chen, Guanghuan; Chen, GD; Liu, Zhankun] Hunan Key Lab Non Ferrous Resources & Geol Hazard, Changsha, Peoples R China.;[Xie, Shaofeng] Cent South Univ Forestry & Technol, Coll Forestry, Changsha, Peoples R China.;[Yang, Xin; Li, Xiao] Zhaojin Min Ind Co Ltd, Yantai, Peoples R China.
通讯机构：
[Chen, GD ] S;Shandong Inst Geol Sci, MNR Key Lab Gold Mineralizat Proc & Resources Util, Shandong Key Lab Mineralizat Geol Proc & Resources, Jinan, Peoples R China.;Cent South Univ, Sch Geosci & Info Phys, Key Lab Metallogen Predict Nonferrous Met & Geol E, Minist Educ, Changsha, Peoples R China.;Hunan Key Lab Non Ferrous Resources & Geol Hazard, Changsha, Peoples R China.
关键词：
3D modeling;Ore-forming simulation;3D prospectivity modeling;Gold exploration;Jiaojia gold belt
摘要：
Gold mineralization in the Jiaojia gold belt was formed in a structurally-dominant hydrothermal mineral system showing a close spatial association with the Jiaojia detachment fault. This study delves into the Jiaojia gold belt from the perspective of coupled spatial association and ore-forming processes by employing spatial analysis of three-dimensional (3D) models, 3D ore-forming numerical modeling, and 3D prospectivity modeling using machine learning techniques (random forest (RF) and multilayer perceptron (MLP)). The overarching goal is to gain insight into the structural-hydrothermal gold system and pinpoint potential areas of deep-seated gold deposits for future exploration endeavors. The spatial analysis of ore-controlling faults uncovers a close correlation between gold enrichment and specific fault geometrical attributes, including a dip angle ranging from 20 degrees to 40 degrees, minimal variations in dip angle (less than 5 degrees), and convex topographical features. These attributes likely stem from the influence of fault morphology on the flow and pooling of fluids. In conjunction with this, 3D ore-forming numerical modeling of structural deformation and fluid flow reveals that gold mineralization is intertwined with moderate volumetric strain and shear strain of rock and fluid divergence. This interaction seems particularly pronounced in areas characterized by channel-like or gentle features. Consequently, it is plausible that gold distribution in the Jiaojia region is the outcome of a comprehensive coupling process involving strain localization, rock deformation, fluid flow, heat transfer and/or interaction. The deep gold prospectivity models of RF and MLP for the Jiaojia district jointly using the predictive variables of fault geometry features and ore-forming simulation data (volume strain, shear strain, temperature variation, and fluid flux) exhibit higher AUC (area under the curve) values compared to models employing individual predictor variable datasets. This improvement underscores their enhanced predictive capability. The prospectivity results thus were used for identifying gold potential within the Jiaojia region, where five promising gold targets at depth were ultimately determined.
摘要：
The constrained-domination principle (CDP) is one of the most popular constraint-handling techniques (CHTs), since it is simple, nonparametric, and easily embedded in unconstrained multiobjective evolutionary algorithms (MOEAs). However, the CDP overly emphasizes the importance of feasibility, which may lead to the search getting stuck in some locally feasible regions or locally optimal, especially when encountering problems with discontinuous and/or narrow feasible regions. This article seeks to capitalize on the strengths of the CDP while overcoming its weaknesses. Accordingly, we propose a novel constrained MOEA (called MOEA/D-LCDP), in which the CDP is applied in a local manner. Unlike most CHTs that emphasize feasibility, which use the feasibility rule in the whole search space, the proposed localized CDP only adopts the CDP within the niche. That is, to maintain the diversity of the population, only solutions within the niche are compared based on the localized CDP. The niche radius is determined a priori by the acute angle between the current subproblem and its nearest subproblem. Additionally, a population-based status detection strategy is developed to allocate computing resources more rationally, and a diversity-enhanced CDP is designed to enhance the exploitation of the search. Comprehensive experiments conducted on four benchmark test suites with a total of 34 problems and three real-world applications demonstrate that MOEA/D-LCDP is very competitive with representative algorithms.
摘要：
Extensive research has been conducted on Camellia oleifera Abel., a cultivar predominantly distributed in China, to investigate its phytochemical composition, owning to its potential as an edible oil crop. Pentacyclic triterpene saponins, as essential active constituents, play a significant role in contributing to the pharmacological effects of this cultivar. The saponins derived from C. oleifera (CoS) offer a diverse array of bioactivity benefits, including antineoplastic/bactericidal/inflammatory properties, cardiovascular protection, neuroprotection, as well as hypoglycemic and hypolipidemic effects. This review presents a comprehensive analysis of the isolation and pharmacological properties of CoS. Specially, we attempt to reveal the antitumor structure-activity relationship (SAR) of CoS-derived triterpenoids. The active substitution sites of CoS, namely, C-3, C-15, C-16, C-21, C-22, C-23, and C-28 pentacyclic triterpenoids, make it a unique and highly valuable substance with significant medicinal and culinary applications. As such, CoS can play a critical role in transforming people's lives, providing unique medicinal benefits, and contributing to the advancement of both medicine and cuisine.
摘要：
Knots in wood have a substantial impact on both the physical and mechanical properties of derived products. It is necessary to study their effect on the mechanical properties of wood and understand the mechanisms behind the effect. The modulus of elasticity (MOE) and modulus of rupture (MOR) of specimens without knots and with knots are measured using the three-point bending test. The size and position of knots are recorded. The specimens with knots are analyzed according to failure not at knots and failure at knots. For specimens with failure at knots, they are further divided into two sub-groups, i.e., failure around knots (FK-A) or failure in knots (FK-I).
