Gaoya dianqi为提高35CrMo基活塞杆关键部位的耐磨性，防止电镀工艺带来的镀层剥落失效问题。采用激光熔覆技术在35CrMo钢基材上制备不同工艺参数的20%WC/Ni基复合涂层，利用SEM、EDS、维氏硬度计和HRS-2M往复式摩擦磨损测试仪，研究了熔覆层的宏观形貌、微观形貌、显微硬度和耐磨性，最后采用激光熔覆最优工艺参数制备活塞杆并开展10 000次机械寿命试验。激光能量密度为63.3 J/mm2能够提高熔覆层组织均匀性、降低晶粒尺寸和提高熔覆层硬度；熔覆层组织越均匀、晶粒越细小有利于硬度、摩擦磨损等性能的提高 ...
张晓敏 +8 more
doaj
[Niemann-Pick disease with two missense mutations in SMPD1 gene: a case report and literature review]. [PDF]
Zhonghua Xue Ye Xue Za ZhiWei Y, Guo H, Xu JN, Chen YY, Shi HX.
europepmc +1 more source
Gongye shui chuli通过放电等离子烧结（SPS）技术制备了不同铋掺杂比例的钛基电极（Bi-Ti），用于强化氟苯尼考（FLO）的电化学降解。Bi掺入显著提高了电极的表面粗糙度，并有效提升了电极的催化活性和电子传输性能。在电解质为30 mmol/L Na2SO4，pH=7，电流密度为0.02 A/cm2，FLO质量浓度为10 mg/L的条件下，Bi掺杂质量分数为3%的Bi-Ti电极在120 min内对FLO的降解率为81.87%，反应速率常数为0.013 9 min-1，为纯Ti电极的3倍。·OH被鉴定为主要活性物种 ...
王志君, 汪剑锋, 刘仲雯, 朱勇
doaj
[Applications and challenges of ultra-high molecular weight polyethylene fibers in minimally invasive medical devices]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiShi S +9 more
europepmc +1 more source
Gongye shui chuli为有效治理城市景观水体中的蓝藻水华问题，并克服传统控藻技术易受环境因素干扰、菌体易流失等缺陷，以高效溶藻细菌CH14为对象，采用海藻酸钠（SA）与高岭土为复合载体对其进行包埋固定，系统开展了微球制备工艺优化及控藻效能研究。通过单因素实验确定最佳制备条件为SA质量浓度25 g/L、高岭土质量分数0.5%、CaCl2质量浓度30 g/L、菌液包埋剂量150 mL和交联时间30 min，此条件下微球7 d后的溶藻率达83.24%。微球在溶藻后表面粗糙度显著增加、孔洞变大 ...
蔡震 +4 more
doaj
[Optimized extraction of active components of <i>Paeonia lactiflora</i> and their antioxidant, anti-inflammatory and pigmentation-reducing effects for skin whitening]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoXu Q +6 more
europepmc +1 more source
[Effect of porous surface structure on fatigue strength of 3D printed zirconia]. [PDF]
Beijing Da Xue Xue Bao Yi Xue BanZhao J +6 more
europepmc +1 more source
基于近壁RANS模型的光滑壁突变为粗糙壁条件下平板湍流流动预测
针对湍流边界层在光滑壁面突变为粗糙壁面条件下的典型流动问题,本文开展了数值模拟研究。研究对象为充分发展的平板湍流边界层,其光滑段基于动量厚度的雷诺数为Re_theta=5950。研究重点在于评估雷诺平均纳维斯托克斯（RANS）模型在预测由粗糙度突变引发的内部边界层（IBL）演化过程中的适用性。计算采用双层k-epsilon湍流模型,并通过引入水动力粗糙度长度y0,模拟粗糙壁面对平均流场与湍流结构的影响。结果显示,在粗糙段起始处下游形成明显的速度发展区,其中速度剖面表现出下层受粗糙度控制 ...
楚明翰
core
[Aggressive NK-cell leukemia with CD5(+)CD10(-) monoclonal B cell lymphocytosis and hemophagocytic lymphohistiocytosis: a case report and literature review]. [PDF]
Zhonghua Xue Ye Xue Za ZhiLiu M +5 more
europepmc +1 more source
[Construction of predictive models for type 2 diabetic retinopathy based on the principle of differentiation of syndrome elements]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoQiao S, You J, Wang C, Xiong H, Li S.
europepmc +1 more source