3D-printed strontium-doped BG-CaSiO3-HA composite scaffolds promote critical bone defect repair by improving mechanical strength and increasing osteogenic activity

The release of silicon and calcium elements contained in silicon-based materials promotes the formation of bone. For bioactive glass prepared by the sol-gel method, water-soluble binders are usually added when preparing 3D printed scaffolds. However, the obtained scaffolds are prone to collapse when exposed to water and have low strength. At the same time, the binder needs to be removed for clinical applications, so the 3D printed scaffolds need to be sintered. Under high temperature, bioactive glass scaffolds will be transformed into composite scaffolds composed of bioglass, CaSiO₃ and hydroxyapatite, while different sintering temperatures will form different crystal types of CaSiO₃. In this study, SrBG-βCS-HA and BG-βCS-HA were obtained at a heating rate of 5 °C/min to 1100 °C and at the same rate to room temperature. SrBG-αCS-HA and BG-αCS-HA were obtained at a heating rate of 2 °C/min to 1200 °C and at the same rate to room temperature. In vitro and in vivo experiments verified that the presence of strontium in the obtained scaffolds after sintering further enhanced the osteogenic properties of the scaffolds. SrBG-αCaSiO₃-HA and SrBG-βCaSiO₃-HA were found to have relatively better osteogenic properties. The results show that SrBG-CaSiO₃-HA 3D printing scaffolds have excellent clinical application potential.     

大豆酶解产物复合含氮糖浆用于啤酒发酵的研究

本文主要对大豆蛋白水解产物用于部分替代麦汁进行啤酒发酵的可行性进行了实验研究,并对发酵液的理化指标进行了检测分析.实验证明酵母在添加了大豆蛋白酶解液中的发酵液里可以正常发酵,所得啤酒各项指标均符合国家标准.     

真空转鼓过滤机的调速技术改造

针对从荷兰的DORR-OLIVER公司引进的预涂式真空转鼓过滤机的皮带调速齿轮电机的调速系统出现的问题,采用FRN2.2G11S-4CX富士变频器的变频调速系统,选择合适的Y100L/4驱动电机,设置变频工频切换电路,进行设备调速的技术改造.经过了5年多的实践,证明技改后的设备运转稳定正常,操作简单,控制高效,维护方便...     

探讨定性检验麦芽糊精残留高温淀粉酶活性的三种方法

介绍了定性检验麦芽糊精成品中残留高温淀粉酶活性的三种方法：糖组分测试法、DE值测试法和黏度测试法。实验结果表明：通过测定麦芽糊精溶液95℃保温24h的糖组分、测定麦芽糊精溶液95℃保温8h的DE值或测定麦芽糊精与淀粉混合糊液50℃保温24h的黏度,都可以有效定性麦芽糊精产品是否残留高温淀粉酶活性,这三种测试方法可供麦芽糊精生产企业和用户选择。     

Structural,optical and temperature dependent photoluminescence properties of Cr3+-activated LaGaO3 persistent phosphor for optical thermometry

Cr³⁺ doped LaGaO₃ phosphor was prepared by hydrothermal reaction method with post-annealing treatment. XRD pattern showed the pure orthorhombic phase of LaGaO₃ at an annealing temperature of 1000 °C. TEM image showed the particles in the range 40-120 nm. The bandgap energy and Urbach tail increased in the doped sample as compared to the undoped sample as estimated from UV–visible diffuse reflectance spectra. PL excitation spectra showed peaks in UV, blue and orange regions. The emission spectra showed broadband with peaks in the NIR region due to emission from ⁴T₂ and ²E states. The intermediate strength of the crystal field has been calculated from the estimated spectroscopic parameter. The average lifetime was found to be in the ms range. Afterglow decay was also recorded. From the low-temperature PL, the zero phonon line, stokes shift energy, vibrational energy and Huang-Rhys parameter were calculated. With rising the temperature, PL emission peak intensity and lifetime values decreased and FWHM increased because of increased numbers of electrons in ⁴T₂ state and increasing non-radiative transition. Temperature-dependent peak intensity ratios and lifetime values were utilized for temperature sensing applications in below room temperature and above room temperature. The results indicate the possibility of present phosphor to be used as optical nanothermometer.     

Sampling procedure in a willow plantation for estimation of moisture content

Heating value and fuel quality of wood is closely connected to moisture content. In this work the variation of moisture content (MC) of short rotation coppice (SRC) willow shoots is described for five clones during one harvesting season. Subsequently an appropriate sampling procedure minimising labour costs and sampling uncertainty is proposed, where the MC of a single stem section with the length of 10–50 cm corresponds to the mean shoot moisture content (MSMC) with a bias of maximum 11 g kg⁻¹. This bias can be reduced by selecting the stem section according to the particular clone. The average difference in MSMC between the largest and smallest shoot in a stump was 31 g kg⁻¹. This variation is only marginally smaller than the variation found in MC between stumps. The MC of individual stem sections may vary as much as 190 g kg⁻¹ in one shoot. Variation in whole shoot moisture content was primarily influenced by the shoot diameter, but in addition significant effects of clone and shoot age were found.     

Rippling Colloidal Polyelectrolyte Complex for Customized Fingerprints with High Tactile Perception

Fingerprints possess wide applications in personal identification, tactile perception, access control, and anti-counterfeiting. However, latent fingerprints are usually left on touched surfaces, leading to the leakage of personal information. Furthermore, tactile perception greatly decreases when fingerprints are covered by gloves. Customized fingerprints are developed to solve these issues, but it is a challenge to develop fingerprints with various customized patterns using traditional techniques due to their requiring special templates, materials, or instruments. Inspired by ripples on the lake, blowing air is used to generate surface waves on a colloidal polyelectrolyte complex, leading to vertical stratification and the accumulation of particles near the top of the film layer. As water rapidly evaporates, the viscosity of these particles significantly increases and the wave is solidified, forming fingerprint patterns. These customized fingerprints integrate functions of grasping objects, personal identification without leaving latent fingerprints and tactile perception enhancement, which can be applied in information security, anti-counterfeiting, tactile sensors, and biological engineering.     

铋系纳米材料在润滑中的应用

绿色金属铋系纳米材料在满足润滑剂环保要求同时也显示了良好的摩擦学性能。综述了近年来纳米材料的制备方法以及铋系纳米材料在润滑油脂中的作用机制和应用进展,并指出了铋系纳米材料作为润滑油脂添加剂在摩擦学中的研究发展趋势。铋系纳米材料在润滑油脂中的作用机制为:铋系纳米有机物易于吸附在摩擦金属表面上,生成了一层有机复合膜;由于铋金属纳米粒子带有电荷而向表面移动,并沉积于摩擦表面形成非晶体或无定形膜,从而起到减摩抗磨作用。铋纳米粒子在润滑油中的分散性和稳定性问题是影响其在润滑中推广应用的主要因素,通过改进纳米粒子的制备工艺及研制和合成新的分散剂和稳定剂,可解决润滑油中纳米粒子在苛刻条件下的稳定性。     

一种安装橡胶护舷的装置

为了适应水运事业的发展,满足营运需要,采取更换橡胶护舷实现码头的改造是一项有效的措施。但是型号不同的橡胶护舷,其安装用的螺栓规格、数量与间距也不同,在施工中用什么方式安装新配置的橡胶护舷至关重要。本文介绍了一种以"定位板"结构安装的鼓型橡胶护舷,此装置的特点是在施工中对在营码头不会造成伤害,又可以节省施工时间,已在深圳市中石化大鹏湾油库码头西泊位更换橡胶护舷的施工中应用,效果很好,是一个成功范例,具有推广价值。     

影响GB／T20885中DE值测定准确性的因素探讨

在不同因素影响下采用同样的方法（GB／T20885中直接滴定法）对糖浆的DE值进行检测。结果显示：不同生产厂的试剂、电炉以及使用不同数量的玻璃珠、不同的滴定速度等都会对DE值检测的准确性造成不同程度的影响。