1. 报告题目：How to write and publish a paper

报告时间：2023年6月7日（星期三）下午15:00-17:00

报告地点：best365官网app下载154全景教室

2. 报告题目：Microstructure and Dissolution Behavior of Granulated Urea Fertilizers

报告时间：2023年6月9日（星期五）上午9:30-11:30

报告地点：best365官网app下载154全景教室

内容简介：Nitrogen-based fertilizer products, such as urea, are highly soluble in water and exhibit high internal porosity. Uncontrolled dissolution leads to soil and water contamination from nutrient leaching. In the U.S., more than 50% of nitrogen nutrients transported from the Mississippi basin into the Gulf of Mexico are due to intensive use of fertilizers in field crops. The surplus of organic matter content in surface and groundwater systems causes eutrophication and death of aquatic ecosystems. Relevant literature has established relationships between internal density and formulation properties to the disintegration and dissolution kinetics of pharmaceutical granules. However, few studies investigated the role of internal structure in the functional performance of agrochemicals. This work investigated the influence of formulation and process design on the internal structure and nutrient release of urea granules to mitigate nutrient losses due to fertilizer leaching. Compacts at 50 and 100 MPa were produced using a die-punch set of a mechanical testing machine from a mixture of urea and a binder (xanthan/konjac gum) in powder form at a fixed binder-solid ratio. The compacts were then milled to produce core granules and the dissolution was compared with control groups (without binder). These core granules were then drum granulated to produce bilayer granules. The granules were analyzed for their internal porosity distributions using an x-ray microcomputed tomography and dissolution behavior. Control core and binder-core granules from compacts at 100 MPa delayed nutrient release to a time factor of three compared with less densified granules and market urea. The fractional dissolution rate of control core and binder-added core granules exhibited non-monotonic behavior. Nonetheless, bilayer granules and market urea had monotonic and faster fractional dissolution rates. A higher granule density and the properties of the binder helped maintain the composite’s integrity while enabling binder migration and gelation at the solid-liquid interface. This study unveiled the need for particle design to optimize the dissolution kinetics and develop smart fertilizers for field crops.

3. 报告题目：Introduction of Purdue ABE and CAU-Purdue Agricultural Engineering 2+2 program

报告时间：2023年6月10日（星期六）上午9:30-11:30

报告地点：三教118

联系人：刘嫣红 13521779392

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报告人简介：

Kingsly Ambrose：Professor of Agricultural and Biological Engineering at Purdue University, vice editor of Applied Engineering in Agriculture, Transactions of the ASABE. Prof. Ambrose earned his B.E. and M.E. degrees in Agricultural Engineering from Tamil Nadu Agricultural University, India. He earned his Ph.D. in Agricultural and Biological Engineering from Purdue University, USA. His research interests are in particle and powder characterization, particle modeling, particle design, and safety during powder handling. He has authored/co-authored 108 peer-reviewed journal articles and 5 book chapters. Prof. Ambrose has contributed in 124 conference presentations. His current research sponsors/collaborators include USDA, US Department of Labor, US DOE, The Andersons, CNH Industrial, National Grain and Feed Association, and Anton Paar.