Category: Scientific papers

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

Fabrication and optical studies of transparent Tm, Ho:YAG ceramics Agata Sidorowicz, Magdalena Nakielska, Anna Wajler, Helena Węglarz, Katarzyna Jach, Andrzej Olszyna Abstract The aim of this work has been to obtain transparent Tm, Ho:YAG ceramics (thulium doping range: 2–6 at.%, holmium doping range: 0.1–1.0 at.%) by reaction sintering using commercial powders. It has been proved that the… Continue reading Fabrication and optical studies of transparent Tm, Ho:YAG ceramics

Spray Freeze Granulation of Submicron Alumina and its Sintering Behavior via Spark Plasma Sintering

Spray Freeze Granulation of Submicron Alumina and its Sintering Behavior via Spark Plasma Sintering Wei Liu, Zhipeng Xie Abstract: Spray freeze granulation is an improved method based on spray granulation, solving many limitations of spray granulation. In this work, spray freeze granulation of submicron alumina is performed to explore the possibility of industrial-scale production of… Continue reading Spray Freeze Granulation of Submicron Alumina and its Sintering Behavior via Spark Plasma Sintering

Injectability of calcium phosphate pastes: Effects of particle size and state of aggregation of β-tricalcium phosphate powders

Injectability of calcium phosphate pastes: Effects of particle size and state of aggregation of β-tricalcium phosphate powders Torres PM, Gouveia S, Olhero S, Kaushal A, Ferreira JM Abstract The present study discloses a systematic study about the influence of some relevant experimental variables on injectability of calcium phosphate cements. Non-reactive and reactive pastes were prepared,… Continue reading Injectability of calcium phosphate pastes: Effects of particle size and state of aggregation of β-tricalcium phosphate powders

Effects of cryogenic freezing by liquid nitrogen on the quality and microstructure of silver pomfret (pampus argenteus)

Effects of cryogenic freezing by liquid nitrogen on the quality and microstructure of silver pomfret (pampus argenteus) Lu, J., Yu, H.-X., Yang, S.-B., Jiang, Q.-Q., Liu, W.-J., Dong, K.-C., Hu, Y.-Q. 中文摘要:       银鲳鱼经液氮喷淋方法（中心温度达-40 ℃，需20 min）冻结后于-18 ℃进行冻结贮藏试验。作为对照，对大小相近的同批原料进行平板冻结（中心温度达-20 ℃，需6 h）及冰柜冻结(中心温度达-18 ℃，需20 h)处理，冻藏条件与液氮速冻样品相同。结果表明，液氮速冻、平板速冻、冰柜冻结的样品的pH值在第105天降至最低（6.42、6.35、6.11），冻藏150天后盐溶蛋白质浓度分别为6.71、3.24、1.38 mg/g，Ca2+-ATPase活性分别为1.73×10-3、0.76×10-3、0.56×10-3 μmol/(min?mg)。冻结温度愈低，K值、TVBN值增加愈小。TPA图谱分析显示，硬度、弹性和回复性均随着冻藏时间的延长呈显著降低趋势(P＜0.05)；较低的冻结温度可使各指标数值变化趋缓。微观结构观察发现，贮藏150天的液氮组样品肌纤维间隙最小、细胞完整致密，与新鲜样品最为接近；液氮深冷速冻对银鲳冻藏品质维持效果最佳。 英文摘要: Abstract:       Silver pomfret (Pampus argenteus) was pretreated with liquid nitrogen (LN2) by… Continue reading Effects of cryogenic freezing by liquid nitrogen on the quality and microstructure of silver pomfret (pampus argenteus)

Pharmaceutical spray freeze drying

Pharmaceutical spray freeze drying Stefan Wanning, Richard Süverkrüp, Alf Lamprecht Abstract Pharmaceutical spray-freeze drying (SFD) includes a heterogeneous set of technologies with primary applications in apparent solubility enhancement, pulmonary drug delivery, intradermal ballistic administration and delivery of vaccines to the nasal mucosa. The methods comprise of three steps: droplet generation, freezing and sublimation drying, which… Continue reading Pharmaceutical spray freeze drying

Preparation of transparent neodymium-doped yttrium aluminate garnet (Nd:YAG) ceramics with the use of freeze granulation

Preparation of transparent neodymium-doped yttrium aluminate garnet (Nd:YAG) ceramics with the use of freeze granulation Anna Wajler, Helena Węglarz, Agata Sidorowicz, Łukasz Zych, Magdalena Nakielska, Katarzyna Jach, Henryk Tomaszewski Abstract This paper presents the results of the application of freeze granulation to the production of transparent neodymium-doped yttrium–aluminum garnet ceramics. Aqueous suspensions of aluminium oxide, yttrium oxide and neodymium oxide powders… Continue reading Preparation of transparent neodymium-doped yttrium aluminate garnet (Nd:YAG) ceramics with the use of freeze granulation