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Articles 57571 - 57600 of 302428

Full-Text Articles in Physical Sciences and Mathematics

Chemical Nature Of Phosphorus In Cropping Soils From Western Australia Characterised By 31p Nuclear Magnetic Resonance Spectroscopy, Gustavo Boitt, Craig Scanlan, Zed Rengel Jun 2021

Chemical Nature Of Phosphorus In Cropping Soils From Western Australia Characterised By 31p Nuclear Magnetic Resonance Spectroscopy, Gustavo Boitt, Craig Scanlan, Zed Rengel

The State of Soil Science in WA

Speciation of soil phosphorus (P) is paramount to understanding the biogeochemical cycle in agroecosystems and key for an efficient P management. Most studies using solution-state 31P nuclear magnetic resonance (NMR) spectroscopy for P speciation were done in soils from eastern Australia. Currently, in-depth knowledge of the P dynamics is limited for the western-Australian region. Only one study has been published using solution-state 31P NMR to characterise P compounds in topsoils (0–2.5 cm) from Western Australia under karri (Eucalyptus diversicolor F. Muell.) forests. Therefore, the objective of this research is to improve our knowledge and provide new information on the …

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Crop Response To Amelioration Of Agricultural Soils Are Mediated By Constraint Combinations And Soil Type, Stephen Davies, Wayne Parker, Giacomo Betti, David Hall, Tom Edwards, Chad Reynolds, Glenn Macdonald Jun 2021

Crop Response To Amelioration Of Agricultural Soils Are Mediated By Constraint Combinations And Soil Type, Stephen Davies, Wayne Parker, Giacomo Betti, David Hall, Tom Edwards, Chad Reynolds, Glenn Macdonald

The State of Soil Science in WA

Over the past decade alternative strategic deep tillage approaches have been developed to complement more established soil amelioration methods. Strategic tillage takes the form of a one-off or occasional intervention, implemented to overcome a number of soil and biotic constraints.

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Designing Soil Covers For Ecological Restoration Of Mine Waste, Lucy Commander, Luis Merino-Martin, Peter Golos, Carole Elliott, Jason Stevens, Ben Miller Jun 2021

Designing Soil Covers For Ecological Restoration Of Mine Waste, Lucy Commander, Luis Merino-Martin, Peter Golos, Carole Elliott, Jason Stevens, Ben Miller

The State of Soil Science in WA

Iron-ore mining is a major industry in Western Australia. The process of iron-ore extraction results in waste rock which may be backfilled into the pit void or discarded to form ‘waste rock dumps’ and fines, a by-product of crushing iron-ore. Resource companies have a legal and social responsibility to restore waste-rock dumps using local species. However, waste material may not be ideal for plant growth. Hence, as well as gaining an understanding of soil chemical and physical properties of waste materials, it is important to understand the plants interactions with the soil, especially in the early stages of restoration, such …

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Efficacy Of A Phosphate Bio-Mineral Fertilizer Varied With P Concentration And P Solubility, Salmabi Assainar, Lynette Abbott, Paul Storer, Kadambot Siddique, Zakaria Solaiman Jun 2021

Efficacy Of A Phosphate Bio-Mineral Fertilizer Varied With P Concentration And P Solubility, Salmabi Assainar, Lynette Abbott, Paul Storer, Kadambot Siddique, Zakaria Solaiman

The State of Soil Science in WA

Bio-mineral fertilizers are gaining increasing attention in cropping systems. Phosphorus (P) use efficiency for wheat (Triticum aestivum L.) from bio-mineral fertilizers is not well studied. We investigated the efficiency of a bio-mineral fertilizer (rock mineral fertilizer inoculated with a multispecies microbial inoculant and augmented with different phosphorus sources of varying concentration) under both glasshouse and field conditions.

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Humic Acid Coated Phosphatic Fertilizers Enhance Growth, Yield And Phosphorus Uptake Of Maize Crop In Alkaline Soil, Muhammed Shafi, Muhammed Sharif, Dost Muhammed, Ahmed Khan, Farmanullah Khan, Mehran Ali, Zakaria Solaiman Jun 2021

Humic Acid Coated Phosphatic Fertilizers Enhance Growth, Yield And Phosphorus Uptake Of Maize Crop In Alkaline Soil, Muhammed Shafi, Muhammed Sharif, Dost Muhammed, Ahmed Khan, Farmanullah Khan, Mehran Ali, Zakaria Solaiman

The State of Soil Science in WA

Phosphorus availability to crop is one of the major causes of poor crop production worldwide. Effect of inorganic phosphorus (P) fertiliser sources, i.e., nitro phosphate (NP), di-ammonium phosphate (DAP) and single superphosphate (SSP) coated with different humic acid levels on crop production and P utilization efficiency (PUE) of maize was studied.

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Engineering In Situ Soil And Plant Microbiomes To Improve Agricultural Productivity, Falko Mathes, Fiona Mcdonald, Peter Keating Jun 2021

Engineering In Situ Soil And Plant Microbiomes To Improve Agricultural Productivity, Falko Mathes, Fiona Mcdonald, Peter Keating

The State of Soil Science in WA

The world’s population is predicted to reach 9 billion people by 2050 thus increasing crop production on current agricultural land to meet the rising demand for food is paramount. Farmers routinely manage both plant and soil nutrition to increase crop yields. However, active management of in situ soil and plant microbiomes to improve productivity is uncommon. Here, we present a patented technology aiming to reliably engineer soil and plant microbiomes to increase crop production. Bioprime is a ferment of molasses that can be applied as seed coating, or as foliar and soil spray.

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Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton Jun 2021

Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton

The State of Soil Science in WA

No abstract provided.

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Yield Response To Deep Ripping Of Canola, Wheat And Barley On Soils With Multiple Constraints, Shahab Pathan, David Hall, Tony Murfit Jun 2021

Yield Response To Deep Ripping Of Canola, Wheat And Barley On Soils With Multiple Constraints, Shahab Pathan, David Hall, Tony Murfit

The State of Soil Science in WA

Yellow Tenosols (yellow deep sand) in the Western Australian grainbelt often have multiple constraints to crop production, which include non-wetting, subsoil compaction and acidity. As a result of these multiple limitations these soils have been considered poor cropping soils with estimated costs in lost production exceeding $200/ha. A systems approach to managing these soils has been developed to improve crop production, which includes a winter fallow, limesand application and deep tillage in late winter and seeding canola in the following autumn.

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Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton Jun 2021

Impact Of Lime And Gypsum On Wheat Yield, Soil And Solution Properties In The Short And Long Term, Geoff Anderson, Shahab Pathan, David Hall, Rajesh Sharma, James Easton

The State of Soil Science in WA

Subsoil aluminium (Al) toxicity or soils with AlCaCl2 content > 2.5 mg Al kg-1 in the soil layers below 10 cm is a significant problem in south Western Australia. Both lime and gypsum can be used to treat subsoils Al toxicity because these products decrease the toxic effect of soil Al leading to an increase in crop grain yields. In this presentation, results are reported from three field lime by gypsum rate experiments located in the east of Merredin.

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Influence Of Lime And Crop Rotation On Soil Nitrogen, Dry Matter Production And Microbial Biomass; A Field Trial, Merredin, Wa, Manjula Premaratne, Daniel V. Murphy, Craig Scanlan, Frances C. Hoyle Jun 2021

Influence Of Lime And Crop Rotation On Soil Nitrogen, Dry Matter Production And Microbial Biomass; A Field Trial, Merredin, Wa, Manjula Premaratne, Daniel V. Murphy, Craig Scanlan, Frances C. Hoyle

The State of Soil Science in WA

Nitrogen (N) fertilisers are applied to the soil to meet crop N demands. A large proportion of Western Australian (WA) cropping soils are acidic, decreasing access to plant available nutrients. Application of lime is generally the most effective means of ameliorating increasing soil acidity. Meanwhile, legumes are grown rotationally with cereals to increase plant-available soil N levels. We used a field experiment at Merredin, WA (Latitude -31.483347; Longitude 118.219093) to measure the influence of historic lime application and crop rotation on soil N availability and microbial biomass carbon (MBC).

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Microalgae And Phototrophic Purple Bacteria For Nutrient Recovery From Agri-Industrial Effluents; Influences On Plant Growth, Rhizosphere Bacteria, And Putative C & N Cycling Genes, Somayeh Zarezadeh, Bede S. Mickan, Sasah Jenkins, Tim Hulsen, Hossein Raihi, Navid R. Moheiman Jun 2021

Microalgae And Phototrophic Purple Bacteria For Nutrient Recovery From Agri-Industrial Effluents; Influences On Plant Growth, Rhizosphere Bacteria, And Putative C & N Cycling Genes, Somayeh Zarezadeh, Bede S. Mickan, Sasah Jenkins, Tim Hulsen, Hossein Raihi, Navid R. Moheiman

The State of Soil Science in WA

Microalgae (MA) and purple phototrophic bacteria (PPB) have the ability to remove and recover nutrients from digestate (anaerobic digestion effluent) and pre-settled pig manure that can be utilized as a bio-fertilizer. The objective of this study was to compare the effect of biologically recovered nutrients from MA and PPB in relation to plant growth and soil biological processes involved in nitrogen & carbon cycling.

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Investigation Of The Common Mycorrhizal Network Concept: Plant Growth Responses In Simulated Intercropping Of A Legume And Grass Under Water Stress, Bede S. Mickan, Miranda Hart, Zakaira Solaiman, Kadambot H.M. Siddique, Sasha Jenkins, Lynette K. Adams Jun 2021

Investigation Of The Common Mycorrhizal Network Concept: Plant Growth Responses In Simulated Intercropping Of A Legume And Grass Under Water Stress, Bede S. Mickan, Miranda Hart, Zakaira Solaiman, Kadambot H.M. Siddique, Sasha Jenkins, Lynette K. Adams

The State of Soil Science in WA

It is widely claimed that the common mycorrhizal network (CMN) plays a significant role in facilitated transfer of nutrients between plants. This experiment investigated the role of a common mycorrhizal network between a C3 legume and a C4 grass under nutrient and water-limited conditions.

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A Fast And Inexpensive Molecular Biological Assay To Assess Soil Health, Fiona Mcdonald, Falko Mathes, Peter Keating Jun 2021

A Fast And Inexpensive Molecular Biological Assay To Assess Soil Health, Fiona Mcdonald, Falko Mathes, Peter Keating

The State of Soil Science in WA

Soil health and biology is capturing public imagination due to its significance in organic and regenerative agriculture and its role in mitigating climate change (a location for potential carbon sequestration). Programs centred on soil health are supported by farmers and funding bodies such as the Soil Biology Initiative (Grains Research and Development Corporation), the National Landcare Program, and the Cooperative Research Centre for High Performance Soils. Additionally, global businesses are diverting resources into understanding soil and crop microbiomes to develop novel technologies that increase soil health and crop productivity to commercialise a variety of products including soil amendments (e.g. sea …

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Inheriting And Advancing The Essence Of Nomadic Culture, And Searching For A New Course Of Harmonious Development On The Grassland, Zhongling Liu, Cunzhu Liang, Lixing Wang, Dunyuan Hao, Huaming Liu Jun 2021

Inheriting And Advancing The Essence Of Nomadic Culture, And Searching For A New Course Of Harmonious Development On The Grassland, Zhongling Liu, Cunzhu Liang, Lixing Wang, Dunyuan Hao, Huaming Liu

IGC Proceedings (1993-2023)

No abstract provided.

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Traditional Ranching Heritage And Cultural Continuity In The Southwestern United States, Carol Raish, Alice M. Mcsweeney Jun 2021

Traditional Ranching Heritage And Cultural Continuity In The Southwestern United States, Carol Raish, Alice M. Mcsweeney

IGC Proceedings (1993-2023)

No abstract provided.

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People, Culture And Nature In The Rural‐Urban Fringe: Impressions From A Study Of Rural Gentrification In The English Midlands, Martin Phillips Jun 2021

People, Culture And Nature In The Rural‐Urban Fringe: Impressions From A Study Of Rural Gentrification In The English Midlands, Martin Phillips

IGC Proceedings (1993-2023)

No abstract provided.

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Research On Component-Based Modeling Of Simulation Entity For Logistics And Equipment Support, Cao Qi, Qun Xiang, Wenzheng Wang Jun 2021

Research On Component-Based Modeling Of Simulation Entity For Logistics And Equipment Support, Cao Qi, Qun Xiang, Wenzheng Wang

Journal of System Simulation

Abstract: There has been a lack of efficient and advanced simulation training means and systems for logistics and equipment support. Aiming at the characteristics of non-antagonism, uncertainty, timeliness, parallelism and discontinuity in the simulation of support operation, the abstraction of three entities, three interaction relations and three organization relations is put forward. By using component-based modeling, the entity for logistics and equipment support is further decomposed into several attribute components and behavior components for modeling, which effectively solves the problem of entity modeling in simulation training of support operation. In this way, the conceptual modeling tool, simulation model …

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Kapitza-Dirac Blockade: A Universal Tool For The Deterministic Preparation Of Non-Gaussian Oscillator States, Wayne Cheng-Wei Huang, Herman Batelaan, Markus Arndt Jun 2021

Kapitza-Dirac Blockade: A Universal Tool For The Deterministic Preparation Of Non-Gaussian Oscillator States, Wayne Cheng-Wei Huang, Herman Batelaan, Markus Arndt

Department of Physics and Astronomy: Faculty Publications

Harmonic oscillators count among the most fundamental quantum systems with important applications in molecular physics, nanoparticle trapping, and quantum information processing. Their equidistant energy level spacing is often a desired feature, but at the same time a challenge if the goal is to deterministically populate specific eigenstates. Here, we show how interference in the transition amplitudes in a bichromatic laser field can suppress the sequential climbing of harmonic oscillator states (Kapitza-Dirac blockade) and achieve selective excitation of energy eigenstates, cat states, and other non-Gaussian states. This technique can transform the harmonic oscillator into a coherent two-level system or be used …

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Research On The Overall Design And Key Technology Of “Human In The Loop” Synthetic Training Simulation, Zhiming Dong, Guangchao Zhu, Xiangzhong Xu, Yaxin Tan, Fan Rui Jun 2021

Research On The Overall Design And Key Technology Of “Human In The Loop” Synthetic Training Simulation, Zhiming Dong, Guangchao Zhu, Xiangzhong Xu, Yaxin Tan, Fan Rui

Journal of System Simulation

Abstract: Aiming at the difficulties of "human-in-the-loop" synthetic training simulation such as large scale, many entities, decentralized deployment and many heterogeneous systems. After study the construction of US Army synthetic training environment, a sustainable evolution cloud service architecture of distributed synthetic training simulation based on TISA middleware is designed, and a composable multi-level synthetic training simulation application model is put forward. It solves the technical problems of distributed training simulation, which are real-time interconnection and interoperability, consistency of battlefield environment, model composition and reuse, simulation as a service, etc. It provides technical supports for large-scale "human-in-the-loop" tactical confrontation exercises and …

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Creating Synthetic Satellite Cloud Data Based On Gan Method, Wencong Cheng, Xiaokang Shi, Zhigang Wang Jun 2021

Creating Synthetic Satellite Cloud Data Based On Gan Method, Wencong Cheng, Xiaokang Shi, Zhigang Wang

Journal of System Simulation

Abstract: To create the synthetic satellite cloud data in the domain of Meteorology, a method based on Generative Adversarial Networks (GAN) is proposed. Depending on ability of the nonlinear mapping and the information extraction of raster data with the deep learning network, a deep generative adversarial network model is proposed to extract the corresponding information between the numerical weather prediction(NWP) products and the satellite cloud data, and then the appropriate elements of the NWP product are chosen as the input to synthesize the corresponding satellite cloud data. The experiments are conducted on the re-analysis products of the European Centre …

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Trajectory Tracking Control Of Robotic Manipulators Based On Smooth Second-Order Sliding Mode, Ruimin Zhang, Qiaoyu Chen Jun 2021

Trajectory Tracking Control Of Robotic Manipulators Based On Smooth Second-Order Sliding Mode, Ruimin Zhang, Qiaoyu Chen

Journal of System Simulation

Abstract: The robotic manipulators have characteristics of strong nonlinearity, strong coupling, multiple input and output, uncertainties, and so on. It is necessary to proposed a multivariable smooth second-order sliding mode trajectory tracking control method. The method can eliminate the chattering in the conventional sliding mode control and increase convergence speed. The property of finite time convergency is proved by the Lyapunov stability theory. Furthermore, the method is applied for the tracking control of two-joint robotic manipulators with model uncertainty and external disturbances. The simulation results show that the proposed method is effective and has high control precision and strong robustness.

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Simulation On The Development Of Residential Distributed Photovoltaic Power Generation Under The Declining Trend Of Feed-In-Tariff, Libo Zhang, Lulu Ge, Changqi Chen, Mingduan Tang Jun 2021

Simulation On The Development Of Residential Distributed Photovoltaic Power Generation Under The Declining Trend Of Feed-In-Tariff, Libo Zhang, Lulu Ge, Changqi Chen, Mingduan Tang

Journal of System Simulation

Abstract: Residential Distributed Photovoltaic Generation (R-DPVG) has become the important developing force of PV generation in China. As the declining of Feed-in-Tariff (FIT), system dynamics method is used to construct a causal loop model for R-DPVG’s development, and relevant factors and their feedback mechanism are qualitatively analyzed. Then a stock-flow model is build, and the ROI, installed capacity, and policy subsidy costs of R-DPVG are simulated under some combined scenarios based on declining FIT. The simulation proves R-DPVG’s FIT will be reduced to 0.05 ~ 0.1 yuan/(kW?h) in the next three years till cancelled. FIT cutting amplitude, capacity and targets …

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Development Paths Of New Energy Vehicles Incorporating Co2 Emissions Trading Scheme, Wenxiang Li, Li Ye, Jieshuang Dong, Yiming Li Jun 2021

Development Paths Of New Energy Vehicles Incorporating Co2 Emissions Trading Scheme, Wenxiang Li, Li Ye, Jieshuang Dong, Yiming Li

Journal of System Simulation

Abstract: New energy vehicles in China have entered the “post-subsidy era”, and it is urgent to explore and establish a long-term mechanism for market-oriented development. The CO2 emission trading scheme for road transport (ETS-RT) is introduced to replace financial subsidies, forming a market-oriented incentive and punishment mechanism. Therefore, a market mechanism is established where internal combustion engine vehicles feed new energy vehicles. A causal loop diagram of system dynamics was used to analyze the key policy parameters of the ETS-RT that affect the development of new energy vehicles. Then a multi-agents-based model of ETS-RT is established to simulate the …

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Research On Chemical Simulation Environment Modeling Based On Complex Terrain, Shunhua Liu, Fang Min Jun 2021

Research On Chemical Simulation Environment Modeling Based On Complex Terrain, Shunhua Liu, Fang Min

Journal of System Simulation

Abstract: Environment simulation is an important part of the construction of simulation training system. Without considering terrain factors in current chemical simulation environment, there are many problems in directing and controlling, simulation interacting, estimating and evaluating of simulation training. Based on the classical Gaussian diffusion model, the new model is suitable for the complex terrain chemical simulation environment through terrain elevation correction, diffusion parameter correction and mass conservation correction. The simulated chemical hazard area is in line with the atmospheric diffusion law of complex terrain. The model presents a realistic environment and fast computing ability, which solves the problem of …

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Research Of Super-Resolution Processing Of Invoice Image Based On Generative Adversarial Network, Xinli Li, Changming Zou, Guotian Yang, Liu He Jun 2021

Research Of Super-Resolution Processing Of Invoice Image Based On Generative Adversarial Network, Xinli Li, Changming Zou, Guotian Yang, Liu He

Journal of System Simulation

Abstract: Automatic identification of invoices can effectively improve financial efficiency. But low-resolution invoice image reduces the accuracy of automatic identification, an ESRGAN (Encoder Super-resolution Generative Adversarial Network) network for super-resolution processing of invoice images is proposed. The ESRGAN network is based on a conditional generative adversarial network. An auxiliary encoder is designed to guide the network to generate a more realistic super-resolution image. Based on the actual invoice image, the ESRGAN network and the conventional image processing, SRCNN (Super-resolution Convolutional Neural Networks) network and SRGAN (Super-resolution Generative Adversarial Network) network. The model is evaluated through two evaluation indicators of peak …

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Research On Digital Protection System Of Intangible Cultural Heritage Based On Mobile Augmented Reality Technology, Shouming Hou, Ge Qian, Yanyan Liu Jun 2021

Research On Digital Protection System Of Intangible Cultural Heritage Based On Mobile Augmented Reality Technology, Shouming Hou, Ge Qian, Yanyan Liu

Journal of System Simulation

Abstract: Aiming at the problem of the single form and poor interaction of intangible cultural heritage protection, a non-heritage digital online display system is designed and implemented based on mobile augmented reality technology. Taking clay sculpture non-heritage protection as an example, the main functional modules of the system cloud and mobile terminal are designed. Based on a combination of 3D scanning and iterative mesh simplification, a fast modeling method is proposed. ORB-FV and optical flow tracking algorithm are used for online recognition and tracking registration of images. The system is developed based on Unity3D. The test results show that, …

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Fault Diagnosis Of Mechanical Equipment Based On Ga-Svr With Missing Data In Small Samples, Jingjing Wei, Qinming Liu, Chunming Ye, Guanlin Li Jun 2021

Fault Diagnosis Of Mechanical Equipment Based On Ga-Svr With Missing Data In Small Samples, Jingjing Wei, Qinming Liu, Chunming Ye, Guanlin Li

Journal of System Simulation

Abstract: In view of the equipment fault diagnosis with small and missing sample data, a method of missing data filling based on support vector regression optimized by genetic algorithm is proposed to improve the accuracy of equipment fault diagnosis. The support vector regression optimized by genetic algorithm was trained by other data values of missing data, and univariate prediction results were obtained. The training set was reconstructed through correlation analysis, so as to obtain the multivariate prediction results. Dynamic weights were established to combine univariate prediction results and multivariate prediction results to fill in the missing data. The …

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Active Learning Intelligent Soft Sensor Based On Probability Selection, Xuezhi Dai, Weili Xiong Jun 2021

Active Learning Intelligent Soft Sensor Based On Probability Selection, Xuezhi Dai, Weili Xiong

Journal of System Simulation

Abstract: Aiming at lack of tag samples and high cost of sampling tags in complex industrial processes, an active learning algorithm based on probability selection is proposed. Firstly, unlabeled samples are performed subspace integration by using the principal component analysis. Then, the information of unlabeled samples is evaluated by the uncertainty, which is calculated based on the out put of all sub learners. And the most valuable samples are selected to mark manually. Finally, the function of unlabeled samples and labeled samples are analyzed, and the termination conditions are designed by introducing the performance index of training set. Through simulations …

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Technical Characteristics Of Digital Twins And Application Prospects In The Field Of Flight Testing, Liu Yu, Xie Qiang Jun 2021

Technical Characteristics Of Digital Twins And Application Prospects In The Field Of Flight Testing, Liu Yu, Xie Qiang

Journal of System Simulation

Abstract: For the application of digital twins in flight tests, the connotation and technical characteristics of digital twins were studied and analyzed. Six flight test digital twins typical application scenarios, such as the requirements development and overall planning of flight test, the flight test mission designing, the integrated testing and modification of flight test, the flight test organization and implementation, the fast maintenance and support and the training of flight test engineers have been designed by mapping the behavior and performance of flight test objects. The synchronize updates, parallel validation and spiral evolution were achieved between the digital models …

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Research On The Offset Of Elliptical Quiet Zone In Catr Of Multiple Feed, Liu Yong, Liwei Guo, Wangyang Song, Jiang Xing, Simin Li, Peng Lin Jun 2021

Research On The Offset Of Elliptical Quiet Zone In Catr Of Multiple Feed, Liu Yong, Liwei Guo, Wangyang Song, Jiang Xing, Simin Li, Peng Lin

Journal of System Simulation

Abstract: Electromagnetic target simulator based on CATR of the quiet zone movement,which adopt the multi-feed source CATR RF signal feeding by reflecting to get the quiet zone movement of simulated far field. It can be used in simulation of seekers in a multi-target mobile environment. The phase of the feeds of the 1×4 horn array is changed to realize the movement of the quiet zone in the CATR. The phase consistency of the millimeter wave quiet zone of the target simulation system determines the target simulation accuracy. The amplitude and phase characteristics of the array feeding with different beam …

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