Water flux,DSC, and cytotoxicity characterization of membranes of cellulose acetate produced from sugar cane bagasse,using PEG 600

Summary In this article, cellulose acetate produced through the homogeneous acetylation of sugar cane bagasse cellulose was used to produce membranes, using poly(ethyleneglycol) 600 (PEG 600) as an admixture. The membranes were characterized using water flux measurements (Payne’s cup), differential scanning calorimetry (DSC) and neutral red uptake (cytotoxicity). The results showed that PEG 600 acts as a crystallinity inductor and/or pore former in the cellulose acetate matrix. The induction of crystallinity is important for this system since it had not been reported on the literature yet. The results also demonstrated that the studied membranes present a nontoxic behavior.     

浅谈工程教育在化工原理实验教学中的体现

工程教育在化工原理实验中的重点应放在提高学生处理工程问题的能力上.这一能力主要表现在工程实验的组织能力、单元装置的操作能力和具备化工过程的整体性观念等方面.     

真空脱气对粉末冶金Ti2AlNb合金力学性能的影响

采用无坩埚感应熔炼超声气体雾化法制备了成分为Ti-22Al-24Nb-0. 5Mo(原子分数,x/%)的预合金粉末,并对预合金粉末的化学成分、表面状态及流动性等进行了表征。通过包套热等静压工艺制备了粉末冶金Ti2AlNb合金,研究了真空脱气对粉末冶金Ti2AlNb合金力学性能的影响。结果表明,超声气体雾化法制备的Ti2AlNb合金粉末化学成分批次稳定性好;从粉末填充的工艺性能方面考虑,热等静压成形应选取粒度小于250μm以下的全粒度分布预合金粉末;真空脱气处理可减少粉末冶金Ti2AlNb合金的孔隙缺陷,提升合金拉伸性能的稳定性和高温持久寿命。     

真空脱气对粉末冶金Ti2AlNb合金力学性能的影响

采用无坩埚感应熔炼超声气体雾化法制备了成分为Ti-22Al-24Nb-0.5Mo(原子分数,x/%)的预合金粉末,并对预合金粉末的化学成分、表面状态及流动性等进行了表征。通过包套热等静压工艺制备了粉末冶金Ti2AlNb合金,研究了真空脱气对粉末冶金Ti2AlNb合金力学性能的影响。结果表明,超声气体雾化法制备的Ti2AlNb合金粉末化学成分批次稳定性好;从粉末填充的工艺性能方面考虑,热等静压成形应选取粒度小于250 μm以下的全粒度分布预合金粉末;真空脱气处理可减少粉末冶金Ti2AlNb合金的孔隙缺陷,提升合金拉伸性能的稳定性和高温持久寿命。     

浓缩鲜荔枝果汁乳酸菌饮料的研制

介绍了用鲜牛奶为原料经乳酸菌发酵后,加入浓缩鲜荔枝果汁配制而成的荔枝乳酸饮料的研制工艺。它具有较高营养价值和特殊的典型性风味,比牛奶更易为人体吸收,并具有良好的保健作用,很受消费者青睐。     

涡流室陶瓷镶块稳态温度场的三维有限元分析

本文采用ADINAT程序,对S195型柴油机涡流室陶瓷镶块和金属镶块的温度场进行了计算,并对计算结果进行了比较分析。     

Effect of thermal induced porosity on high-cycle fatigue and very high-cycle fatigue behaviors of hot-isostatic-pressed Ti-6Al-4V powder components

The present work reports the effect of thermal induced porosity(TIP)on the high-cycle fatigue(HCF)and very high-cycle fatigue(VHCF)behaviors of hot-isostatic-pr...     

EPDM recycling assisted by γ-processing

The integration of waste ethylene–propylene–diene terpolymer (EPDM), containing carbon black into pristine EPDM can be achieved by γ-irradiation as a versatile procedure to process ethylene–propylene elastomers. The presence of acrylic acid in the material formulation allows the formation of intermolecular bridges by threefold increase in gel content. The possibility of achieving greater stability by the addition of acrylic acid in EPDM systems was analyzed. The start materials were EPDM containing 30 and 50 phr of EPDM powder loaded with 40 phr of carbon black aged by pre-exposure to electron beam irradiation. The advanced γ-irradiation exceeding 100 kGy represented the optimal radiation processing condition. Two procedures of chemiluminescence under isothermal and non-isothermal regimes for the evaluation of radiation stability were applied on γ-irradiated samples. The thermal strength of irradiated samples was characterized based on the radiolysis mechanism of EPDM. The variation in the activation energy required for the thermal oxidation of these samples and the modification in gel contents due to the gelation action of acrylic acid were presented for the validation of proposed recycling radiochemical technique. Charlesby–Pinner representation provided different values for the ratios between radiochemical yields of cross-linking and scission, proving that the presence of acrylic acid promoted the conversion of EPDM wastes into valuable materials.     

CTHRSSVVC Peptide as a Possible Early Molecular Imaging Target for Atherosclerosis

The purpose of our work was to select phages displaying peptides capable of binding to vascular markers present in human atheroma, and validate their capacity to target the vascular markers in vitro and in low-density lipoprotein receptor knockout (LDLr^−/−) mouse model of atherosclerosis. By peptide fingerprinting on human atherosclerotic tissues, we selected and isolated four different peptides sequences, which bind to atherosclerotic lesions and share significant similarity to known human proteins with prominent roles in atherosclerosis. The CTHRSSVVC-phage peptide displayed the strongest reactivity with human carotid atherosclerotic lesions (p < 0.05), when compared to tissues from normal carotid arteries. This peptide sequence shares similarity to a sequence present in the fifth scavenger receptor cysteine-rich (SRCR) domain of CD163, which appeared to bind to CD163, and subsequently, was internalized by macrophages. Moreover, the CTHRSSVVC-phage targets atherosclerotic lesions of a low-density lipoprotein receptor knockout (LDLr^−/−) mouse model of atherosclerosis in vivo to High-Fat diet group versus Control group. Tetraazacyclododecane-1,4,7,10-tetraacetic acid-CTHRSSVVC peptide (DOTA-CTHRSSVVC) was synthesized and labeled with ¹¹¹InCl₃ in >95% yield as determined by high performance liquid chromatography (HPLC), to validate the binding of the peptide in atherosclerotic plaque specimens. The results supported our hypothesis that CTHRSSVVC peptide has a remarkable sequence for the development of theranostics approaches in the treatment of atherosclerosis and other diseases.