23 research outputs found
Технология сухого производства фосфоритовой муки
Описана технологія виробництва сухого фосфоритового борошна, яка включає просівання, дрібне дроблення, термічну сушіння, кульове подрібнення в замкнутому циклі з контрольним сепарацією, пневмотранспорт фосфоритового борошна в силосу. Продуктив-ність технологічної лінії – 150 тис. т у рік. Крупность помолу становить 70% кл. 0,16 мм при вологості 1%.Описана технология сухого производства фосфоритовой муки, которая включает грохочение, мелкое дробление, термическую сушку, шаровое измельчение в замкнутом цикле с контрольным грохочением, пневмотранспорт фосфоритовой муки в силоса. Производительность технологической линии – 150 тыс. т в год. Крупность помола составляет 70% кл. 0,16 мм при влажности 1%
Micro-CT imaging as a method for comparing perfusion in graduated-height and single-height surgical staple lines
Matthew Eschbach,1 Gregory M Sindberg,2 Marisha L Godek,1 Matthew Nagelschmidt,1 Nicholas Paquette,3 Michael Wegener,1 James Alberino,1 Jane Mayotte,1 Amit Vasanji,4 Andrew M Miesse1 1Minimally Invasive Therapies Group, Medtronic, North Haven, CT, USA; 2Minimally Invasive Therapies Group, Medtronic, Plymouth, MN, USA; 3Minimally Invasive Therapies Group, Medtronic, Mansfield, MA, USA; 4Image IQ, Cleveland, OH, USA Background: Wound healing is a goal for advanced technology in the surgical space to benefit clinical outcomes. Surgical staplers are commonly used in a variety of open and minimally invasive abdominal and thoracic procedures. Assessment of wound healing traits, such as perfusion, has been challenging due to technical limitations. A novel technique that utilizes micro-computed tomography methodology to measure perfusion was designed to compare the micro-perfusion of staple lines between commercial stapler reloads that employ different staple height strategies. Materials and methods: Following an Institutional Animal Care and Use Committee-approved protocol, rats were euthanized and immediately heparinized prior to a subtotal gastrectomy with either graduated-height or single-height staples. Rats were then perfused with barium, following which stomachs were removed and immediately fixed in formalin to prevent degradation. Stomachs were then imaged using micro-computed tomography and subsequent analysis was utilized to quantify fluid volume and patent vasculature proximity to staples within the staple line region for each group. Results: Average perfusion volume was significantly higher with graduated-height staples (0.33% ± 0.18%) compared to single-height staples (0.16% ± 0.09%, P=0.011). Average vessel-to-staple line distance was not significant but trended lower with graduated-height staples (0.35±0.02 mm) compared to single-height staples (0.36±0.03 mm, P=0.18). Discussion: Graduated-height staples had significantly higher perfusion volume than single-height staples, which likely has a downstream benefit on wound healing and clinical outcomes. Conclusion: This study shows a higher perfusion volume around the staple lines using graduated-height staples as compared to single-height staples and this may contribute to better wound healing in patients. Keywords: micro-computed tomography, wound healing, Tri-Staple, image processing, laparoscopic surgery, microvasculatur
Extended version for publication in supplement modified stapler configuration for optimisation of colonic anastomosis
Extended version for publication in supplement modified stapler configuration for optimisation of colonic anastomosis
Scale Modeling of Oscillating Sheet Jets for the HYLIFE-II Inertial Confinement Fusion Reactor
Energy efficiency of platinum-free alkaline direct formate fuel cells
We report the energy performance of a new platinum-free alkaline direct formate fuel cell, equipped with a commercial anion exchange membrane, a nanostructured Pd/C anode and a Feâ\u80\u93Co/C cathode. The cell was investigated both at room temperature and at 60 °C for the determination of the following parameters: (i) maximum power density, (ii) delivered energy, (iii) faradic (fuel conversion) and energy efficiency. These parameters show a dramatic dependence on fuel composition. The highest energy efficiency is obtained using high energy density fuel (4 M KCOOH and 4 M KOH) and with a maximum operating temperature of 60 °C. This represents a key step in the progress of alkaline platinum-free DFFC technology, demonstrating their potential as power sources for portable electronic devices and remote power generation systems. For example, a fuel load of 750 ml in a DFFC device operating at 60 °C would be able to produce 90 W h of energy, that required to fully charge the battery of a laptop computer