喷雾干燥法制备氧化镁材料及其吸附性能

采用喷雾干燥结合热处理法制备花瓣状的MgO,通过对热处理温度的调整,实现MgO表面形貌的调控。研究了所制备MgO粉末作为吸附剂对刚果红的吸附性能,当热处理温度为400℃,得到花瓣状的MgO纳米结构,比表面积达到140.5 m²·g^-1,且对刚果红溶液的饱和吸附量约为1480 mg·g^-1。它们对刚果红的吸附能力比报道的其他花瓣状结构的金属氧化物要高。此外,对其吸附模型、吸附动力学以及吸附机制进行探究,表明吸附过程符合Langmuir吸附模型,所制备样品对刚果红溶液的吸附过程可以由准二级动力学来描述。所制备的花瓣状MgO其高效的吸附性能,使其成为非常有前景的吸附剂用于去除污水中的刚果红染料。     

一种复合果酒的研制

以红树莓、菠萝和甜瓜为原料,经酶解制汁、发酵及下胶澄清稳定处理,制得发酵复合果酒。经过单因素试验和正交试验,以酒精度为评价指标,确定最佳发酵工艺参数为红树莓汁∶菠萝汁∶甜瓜汁配比2∶1∶1、初始糖度24 °Bx、初始pH值4.0、酵母接种量0.4 g/L,酒精度为11%vol。以透光率为考察指标,确定最佳澄清工艺参数为：膨润土添加量0.4 g/L,澄清温度25 ℃,澄清时间12 d,透光率达到95.60%。酿制的果酒酒精度适宜,果酒呈暗红色,酒液清亮无浑浊,口感爽适纯净,香气协调优雅。     

挂式四氢双环戊二烯的合成方法及催化剂的研究进展

介绍了高密度燃料挂式四氢双环戊二烯(exo-THDCPD)的合成方法,包括两步法和一步法。两步法是以双环戊二烯(DCPD)为原料,先经加氢反应得到桥式四氢双环戊二烯(endo-THDCPD),然后endo-THDCPD进行异构化反应得到exoTHDCPD。一步法也是以DCPD为原料,但加氢和异构化反应同时进行。详细论述了两步法中endo-THDCPD异构化催化剂的类型及研究现状;简要介绍了DCPD一步法制备exo-THDCPD催化剂的研究进展;开发环境友好、高活性和高稳定性的一步法连续合成exo-THDCPD的催化剂是未来的发展趋势。     

基于高效液相色谱法的麻辣火锅底料辣度分级模型建立及其在熬煮过程中的变化

基于高效液相色谱法结合感官评价结果,采用SPSS中的Fisher判别分析方式,对火锅底料进行辣度分级,得到麻辣火锅底料的辣度分级模型;研究熬煮过程中辣椒素类物质（capsaicinoids,Cap-S）的含量变化,得到其影响辣度分级的规律。结果表明,仅用感官评价对火锅底料进行辣度分级受感官评价人员的影响较大,结论准确度不高;若以火锅底料中Cap-S含量为分级标准,其正判率界值为24%＞20%,可以很好地将辣度分为5 个等级,分级模型较为合理。火锅底料熬煮过程会影响Cap-S的迁移,Cap-S在油相和水相中处于动态平衡状态,同时调味料中的Cap-S逐渐迁移到汤底中,使得熬煮过程中辣度总是不断发生变化。高效液相色谱法结合感官评价结果对火锅底料进行辣度分级,可以很好地区分火锅底料的辣度,指导消费者购买合适的食品。     

基于OpenGL的海面场景模拟

研究海面场景的三维模拟技术。针对军事试验中对海面场景的需要,从分析海浪的物理模型出发,分析和研究基于海浪谱的海面建模方法,选取Pierson-Moskowitz海浪谱,利用具有平台独立性的OpenGL图形库对海面场景进行模拟,快速实时有效地的模拟了,不同风速下的海面场景。     

Enhanced antistatic and solvent resistant polycarbonate blends: Fabrication and characterization

This study presents the development of advanced antistatic and solvent resistant polycarbonate blends by incorporating antistatic agents (AAs) into bisphenol A-type polycarbonate (PBPA) and polycarbonate-polysiloxane copolymer (P-Si). A straightforward one-step melt blending was employed to fabricate PBPA/P-Si/AA blends. Comprehensive characterization methods, including Fourier-transform infrared spectroscopy (FT-IR), optical microscope, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and both tensile and impact tests were deployed to study the structure, morphology, thermal, and mechanical behaviors of the synthesized blends. The results demonstrated effective mixing of PBPA and P-Si. The T_g of PBPA/P-Si/AA blends is decreased relative to PBPA, because the chain flexibility of the blends will be increased after adding AA, which is reflected in the impact strength and elongation at break of PBPA/P-Si/AA blends. On the other hand, the thermal stability of PBPA/P-Si/AA is reduced relative to PBPA. The most significant result is that the resistance of the blends to ethyl acetate is enhanced. This is because the addition of P-Si to the matrix introduces a high bonding energy Si O bond, which makes PHBPA/P-Si less prone to detachment and cracking and swelling when exposed to ethyl acetate. While improving the solvent resistance, the blends also have excellent antistatic property, only the concentration of AA is increased to 6 wt.%, and the surface resistance of PBPA/P-Si/AA is reduced from 10⁶ GΩ to only 1 GΩ. This dramatic decrease is a result of the widespread distribution of the positive charge of the ammonium ion throughout the material, promoting the formation of a continuous conductive network within the matrix and thereby enhancing conductivity. In conclusion, this study offers valuable insights into improving the solvent resistance and antistatic characteristics of polycarbonate blends.     

Nested planar array: configuration design,optimal array and DOA estimation

Nested array enables to enhance localisation resolution and achieve under-determined direction of arrival (DOA) estimation. In this paper, we improve the traditional nested planar array to achieve more degrees of freedom (DOFs) and better angle estimation performance. The closed-form expressions for sensor positions of the improved array are given and the optimal array configuration for largest available DOFs is derived. Meanwhile, a computationally efficient DOA estimation algorithm is proposed. Specifically, we utilise two dimensional Discrete Fourier Transform (2D DFT) method to obtain the coarse DOA estimates; Subsequently, we achieve the fine DOA estimates by 2D spatial smoothing multiple signals classification (SS-MUSIC) algorithm. The proposed algorithm enjoys the same estimation accuracy as SS-MUSIC algorithm but with lower complexity because the coarse DOA estimates enable to shrink the range of spectral search. In addition, estimation of the number of signals is not required by 2D DFT method. Extensive simulation results testify the effectiveness of the proposed algorithm.     

冷却塔竹栅填料的特性分析

冷却塔竹产是一种新兴的冷却塔填料,微水发电厂＃２塔在改造中全部更换为该填料。文章主要通过分析该填料的热力特性和阻力特性,结合该填料的特点,评估其使用价值,认为该填料有广泛的应用前景。     

应用反应离子刻蚀技术的静电纺纳米纤维阵列制备

为开发一种简便、高效制备功能纳米纤维阵列的方法,结合静电纺丝和反应离子刻蚀技术制备了有序纳米纤维阵列。研究了纤维膜厚度、掩膜尺寸对形成纤维阵列微结构的影响,初步考察了纤维阵列作为细胞培养基底的生物相容性。研究结果表明：以铜网为掩膜,用氧等离子体刻蚀聚苯乙烯纳米纤维膜,制备了有序的纳米纤维阵列;纤维阵列的结构和尺寸可调,当刻蚀经30min和120min静电纺丝制备的纤维膜时,分别形成了二维有序网格阵列和三维鸟巢结构;在形成的三维纤维结构上培养成纤维细胞（NIH3T3）发现,细胞在三维纤维基底上容易贴壁、生长,纤维阵列具有高的生物相容性。     

益生菌对微生态系统的改善作用及其应用研究进展

人体微生态系统与宿主相互作用、相互影响,在维护机体健康方面发挥着重要作用。当饮食、环境或其他不利因素迫使微生态系统失去平衡时,机体抗感染能力降低,相关疾病也随之而来。益生菌即"有益的微生物",以乳杆菌和双歧杆菌为主,益生菌可以对微生态系统进行正向调节,在维护肠道健康、阴道生殖健康和口腔健康方面具有积极的作用。随着消费者对益生菌认知度的不断提高,益生菌相关的产品广泛流行,益生菌作为活菌型产品的稳定性备受关注。本文综述了益生菌在调节微生态系统、维护机体健康方面的具体作用机制和效果,概括了其在应用过程中面临的问题和相应的解决方案,加深对益生菌益生功能理解的同时,为益生菌的产业应用提供新的思路。