预分解窑煅烧高抗硫酸盐硅酸盐水泥熟料的 生产体会

为了满足高抗硫酸盐硅酸盐水泥的市场需求,通过筛选优质的原燃材料和精心设计配料方案,得以在1 000 t/d生产线上批量生产。其生产控制的关键主要掌握其熟料的技术特点,并在实际生产中进行工艺参数的调整,且需加强回转窑的煅烧控制。对生产出的高抗硫酸盐硅酸盐水泥熟料性能分析,已证明了采用预分解窑煅烧优质的高抗硫酸盐硅酸盐水泥熟料是完全可行的。     

Assessing the Antimicrobial Activity of Polyisoprene Based Surfaces

There has been an intense research effort in the last decades in the field of biofouling prevention as it concerns many aspects of everyday life and causes problems to devices, the environment, and human health. Many different antifouling and antimicrobial materials have been developed to struggle against bacteria and other micro- and macro-organism attachment to different surfaces. However the “miracle solution” has still to be found. The research presented here concerns the synthesis of bio-based polymeric materials and the biological tests that showed their antifouling and, at the same time, antibacterial activity. The raw material used for the coating synthesis was natural rubber. The polyisoprene chains were fragmented to obtain oligomers, which had reactive chemical groups at their chain ends, therefore they could be modified to insert polymerizable and biocidal groups. Films were obtained by radical photopolymerization of the natural rubber derived oligomers and their structure was altered, in order to understand the mechanism of attachment inhibition and to increase the efficiency of the anti-biofouling action. The adhesion of three species of pathogenic bacteria and six strains of marine bacteria was studied. The coatings were able to inhibit bacterial attachment by contact, as it was verified that no detectable leaching of toxic molecules occurred.     

Development of Carbon Nanotube Modified Cement Paste with Microencapsulated Phase-Change Material for Structural–Functional Integrated Application

Microencapsulated phase-change materials (MPCM) can be used to develop a structural–functional integrated cement paste having high heat storage efficiency and suitable mechanical strength. However, the incorporation of MPCM has been found to degrade the mechanical properties of cement based composites. Therefore, in this research, the effect of carbon nanotubes (CNTs) on the properties of MPCM cement paste was evaluated. Test results showed that the incorporation of CNTs in MPCM cement paste accelerated the cement hydration reaction. SEM micrograph showed that CNTs were tightly attached to the cement hydration products. At the age of 28 days, the percentage increase in flexural and compressive strength with different dosage of CNTs was found to be up to 41% and 5% respectively. The optimum dosage of CNTs incorporated in MPCM cement paste was found to be 0.5 wt %. From the thermal performance test, it was found that the cement paste panels incorporated with different percentages of MPCM reduced the temperature measured at the center of the room by up to 4.6 °C. Inverse relationship was found between maximum temperature measured at the center of the room and the dosage of MPCM.     

Peptide Bioconjugates of Electron‐Poor Metallocenes: Synthesis,Characterization, and Anti‐Proliferative Activity

We report the synthesis of metallocene compounds Cp₂M with two different electron‐withdrawing substituents on both cyclopentadienyl rings (hexafluoroacetone (HFA) and chlorobenzoyl ( 1 – 5 ); HFA and COOH ( 6 and 7 ), M=Fe or Ru). The COOH‐containing derivatives were used to synthesize peptide bioconjugates with enkephalin ( 8 and 9 ) and neurotensin ( 10 and 11 ) as well as fluorescein‐labeled neurotensin ( 12 ). All the molecules were fully characterized, including X‐ray structures for 6 and 7 . The physicochemical properties (lipophilicity and electrochemistry) and cytotoxicity on MCF‐7, HT‐29, and PT‐45 cancer cells were evaluated for selected compounds. Electrochemical investigation by cyclic voltammetry revealed that all bis‐substituted metallocenes are up to 300 mV harder to oxidize compared to the monosubstituted 2‐ferrocenylhexafluoropropan‐2‐ol (FcHFA: Δ${E{{{\rm f}\hfill \atop 0\hfill}}}$ =214 mV; disubstituted derivatives: up to Δ${E{{{\rm f}\hfill \atop 0\hfill}}}$ =512 mV; both vs. FcH^0/+). For the bis‐substituted compounds, log P determinations by RP‐HPLC showed increased lipophilicity in comparison to the monosubstituted FcHFA and RcHFA. Cellular uptake was investigated by fluorescence microcopy, and this revealed endosomal entrapment for 12 .     

Heavy Metal Induced Antibiotic Resistance in Bacterium LSJC7

Co-contamination of antibiotics and heavy metals prevails in the environment, and may play an important role in disseminating bacterial antibiotic resistance, but the selective effects of heavy metals on bacterial antibiotic resistance is largely unclear. To investigate this, the effects of heavy metals on antibiotic resistance were studied in a genome-sequenced bacterium, LSJC7. The results showed that the presence of arsenate, copper, and zinc were implicated in fortifying the resistance of LSJC7 towards tetracycline. The concentrations of heavy metals required to induce antibiotic resistance, i.e., the minimum heavy metal concentrations (MHCs), were far below (up to 64-fold) the minimum inhibition concentrations (MIC) of LSJC7. This finding indicates that the relatively low heavy metal levels in polluted environments and in treated humans and animals might be sufficient to induce bacterial antibiotic resistance. In addition, heavy metal induced antibiotic resistance was also observed for a combination of arsenate and chloramphenicol in LSJC7, and copper/zinc and tetracycline in antibiotic susceptible strain Escherichia coli DH5α. Overall, this study implies that heavy metal induced antibiotic resistance might be ubiquitous among various microbial species and suggests that it might play a role in the emergence and spread of antibiotic resistance in metal and antibiotic co-contaminated environments.     

基于TOPSIS原理的注汽管线保温材料优选

注汽管线保温材料的性能影响管线保温情况,进而影响稠油油田生产能耗。通过实地调研与理论研究相结合的方法,基于TOPSIS原理建立一种优选保温材料的评价体系,通过TOPSIS原理与熵权法、层次分析法结合,优选注汽管线保温材料。     

基于碳纳米传感器的复合材料内部缺陷测量及误差估计

结合三维编织复合材料制造工艺,提出了利用碳纳米线传感器对三维编织复合材料试件缺陷检测的应用方法。论述了碳纳米线传感器嵌入三维编织复合材料预制件的方式,分析了碳纳米线传感器的力学特性。分析了编织角对嵌入碳纳米线传感器的影响。系统使用传统的应变放大器测量电阻变化。最后,应用响应面法对实验结果进行统计分析。实验表明,本实验的研究方法成功地实现了三维编织复合材料内部缺陷位置和大小的估计。     

Co-La-Ni/Al_2O_3催化甘油水蒸气重整制氢

以浸渍法制备的Co-La-Ni/Al2O3为催化剂,在固定床反应器中对生物质甘油水蒸气重整制氢反应进行了研究;考察了反应温度、重时空速及进料中水与甘油中碳的摩尔比(水碳比)对反应的影响,同时考察了催化剂的稳定性并对积碳进行分析。实验结果表明,氢产率、潜在氢产率和气相碳转化率随重时空速的增加而逐渐下降,随温度的升高而增大;水碳比的增加在一定程度上有助于促进氢产率、潜在氢产率和气相碳转化率的提高;随反应时间的延长,催化剂的活性因积碳的产生略有降低,反应20 h后趋于稳定。在温度为700℃、水碳比为3、重时空速为2.5 h-1的条件下,氢产率和潜在氢产率分别达到118.15 g/kg和136.41 g/kg,气相碳转化率达到96.36%。对于甘油水蒸气重整制氢反应,Co-La-Ni/Al2O3催化剂具有较好的催化作用及稳定性。     

BCL-100催化剂制备的PE100管材性能

在Innovene S工艺上采用BCL-100催化剂制备了用于生产PE100管材的树脂(BCL树脂),利用GPC-IR,13C NMR,DSC,XRD等方法研究了树脂的相对分子质量及其分布、共聚单体含量及分布、结晶性能、力学性能、流变性能以及制备的PE100管材的性能,并与进口参比催化剂进行了对比。实验结果表明,BCL-100催化剂可生成更多的超高相对分子质量树脂,己烯共聚率高于参比催化剂,且己烯较多地插入到大分子链段中。BCL树脂的结晶度低,球晶平均尺寸22.0 nm,拉伸弯曲模量、断裂伸长率、热稳定性、弯曲模量、简支梁抗冲强度均较高,适合开发大口径低熔垂管材和大容积容器等高等级双峰制品的专用料。利用BCL树脂生产的PE100管材的性能大幅超过PE100级管材的标准。     

GC-MS法测定汽油中的金属抗爆剂

采用GC-MS联用技术建立了一种汽油中金属抗爆剂的定性和定量分析方法,测定了汽油中四乙基铅、二茂铁、环戊二烯三羰基锰(CMT)和甲基环戊二烯三羰基锰(MMT)4种金属抗爆剂的含量。根据4种金属抗爆剂的标准质谱谱图和对汽油组分的GC-MS分析,选择了合适的特征定量离子进行选择离子扫描,可有效降低汽油中其他组分对测定结果的干扰。以氘代三联苯为内标物,采用内标法进行定量。实验结果表明,该方法对质量浓度在0.50~50.00 mg/L内的四乙基铅、二茂铁、CMT和MMT均具有良好的线性响应,线性相关系数均达到0.999,且具有很好的准确度和重复性,加标回收率在94.00%~110.00%之间,相对标准偏差均小于3.1%,可满足汽油中金属抗爆剂的测试要求。