燃烧合成三元碳化合物Ti2AlC1-x

采用Ti，Al和C元素粉末为反应物原料，通过燃烧合成法首次成功地制备出了单相三元碳化合物Ti2AlC1-x。实验结果表明：若以“理想”晶体结构化学式Ti2AlC化学计量比为起始反应原料配比，燃烧产物主晶相为Ti2AlC2；以缺碳的非化学计量比(Ti2AlC1-x)为反应原料配比，即Ti：Al：C=3：1．5：1=2：1：0．7(摩尔比)，得到单相的燃烧产物Ti2AlC1-x。从热力学原理的角度探讨了不同原料摩尔配比对燃烧产物相组成的影响机理。     

用扩冲法修复凹形护环的新工艺

详细介绍了用扩冲法对液压胀形出现凹形的护环进行修复的方法。实践证明,扩冲法修复护环简单、经济、实用。     

护环液压胀形法的新发展及外补液胀形法的生产应用

本文论述了现有液压胀形法生产护环所存在的不足,介绍了新一代液压胀形工艺即外补液胀形的原理、优点,以及在我国首次生产应用中所显示出的明显的技术经济效益。     

WAVE FIELD EXTRAPOLATION IN VISCOELASTIC MEDIUM AND VARIABLE FOCUS METHOD TO SEPARATE SEISMIC COMPOUND WAVE

ＷＡＶＥＦＩＥＬＤＥＸＴＲＡＰＯＬＡＴＩＯＮＩＮＶＩＳＣＯＥＬＡＳＴＩＣＭＥＤＩＵＭＡＮＤＶＡＲＩＡＢＬＥＦＯＣＵＳＭＥＴＨＯＤＴＯＳＥＰＡＲＡＴＥＳＥＩＳＭＩＣＣＯＭＰＯＵＮＤＷＡＶＥ￥ＳｏｎｇＳｈｏｕｇｅｎ；ＹｕａｎＸｉｕｇｕｉ；ＨｅＪｉｓｈａｎ...     

化工过程熵增指数及其在磷复肥清洁生产评价中的应用

从热力学第二定律出发, 指出清洁生产的热力学本质是控制物质由有序结构向无序转化并从中获取最大效益, 其优劣可由过程熵增反映。 引用复杂体系非平衡定态过程最小熵产生原理,推导出依据与外界交换的物流和热流信息定量计算化工复杂系统过程熵增的方法, 并定义过程熵增指数ζ 。 评价了化工过程对环境热力学状态的综合影响。选择以硫和以氨为载能原料的磷复肥工艺为例进行了计算和对比,其过程熵增指数分别为6.753和4.571,反映出载能原料硫作为废物排放对环境热力学状态产生更大的影响。     

30%三唑锡悬浮剂的研制及作用机理分析

[目的]解决30%三唑锡悬浮剂分散稳定性的问题。[方法]为提高30%三唑锡悬浮剂分散稳定性,采用流点法对不同类型的分散剂进行初步筛选并测试表面张力,通过测试SC粒径、Zeta电势、悬浮率、流变性能确定分散剂配比与用量并对分散稳定机理进行分析。[结果]与单一分散剂制备SC相比,聚羧酸盐分散剂SD-816和聚氧乙烯醚磷酸酯分散剂SD-208复配体系制备的SC性能较优,其表观黏度、Zeta电势、粒径和悬浮率分别为386 mPa·s、-37.2 mV、2.58μm及98.4%。并且提出了聚羧酸盐分散剂和聚氧乙烯醚磷酸酯分散剂对农药三唑锡可能的分散机理。[结论]聚羧酸盐SD-816和聚氧乙烯醚磷酸酯SD-208的复配体系可同时提供静电排斥作用和空间位阻,明显改善SC体系的悬浮稳定性。     

SUL-151 Decreases Airway Neutrophilia as a Prophylactic and Therapeutic Treatment in Mice after Cigarette Smoke Exposure

Chronic obstructive pulmonary disease (COPD) caused by cigarette smoke (CS) is featured by oxidative stress and chronic inflammation. Due to the poor efficacy of standard glucocorticoid therapy, new treatments are required. Here, we investigated whether the novel compound SUL-151 with mitoprotective properties can be used as a prophylactic and therapeutic treatment in a murine CS-induced inflammation model. SUL-151 (4 mg/kg), budesonide (500 μg/kg), or vehicle were administered via oropharyngeal instillation in this prophylactic and therapeutic treatment setting. The number of immune cells was determined in the bronchoalveolar lavage fluid (BALF). Oxidative stress response, mitochondrial adenosine triphosphate (ATP) production, and mitophagy-related proteins were measured in lung homogenates. SUL-151 significantly decreased more than 70% and 50% of CS-induced neutrophils in BALF after prophylactic and therapeutic administration, while budesonide showed no significant reduction in neutrophils. Moreover, SUL-151 prevented the CS-induced decrease in ATP and mitochondrial mtDNA and an increase in putative protein kinase 1 expression in the lung homogenates. The concentration of SUL-151 was significantly correlated with malondialdehyde level and radical scavenging activity in the lungs. SUL-151 inhibited the increased pulmonary inflammation and mitochondrial dysfunction in this CS-induced inflammation model, which implied that SUL-151 might be a promising candidate for COPD treatment.     

强化三元混合熔盐的传热性能的实验研究

太阳能发电技术中传热性能的优劣影响着太阳能的利用程度。选用石墨作为强化相变材料传热性能的添加剂与三元混合熔盐（K₂CO₃-NaCl-Li₂CO₃）按照石墨质量分数为5%、10%、15%进行混合制备,使用TC3000通用型导热系数测试仪测定16种试样的导热系数。并测试经历300次循环储能、释能实验试样的导热系数循环稳定性。实验结果表明：添加石墨后的混合相变材料导热系数最高可提升至原混合材料的3.38倍,当石墨的质量分数为15%时,混合相变材料的导热系数最大。在经历300次储能、释能实验后,材料的导热系数基本保持稳定,变化浮动不高于15%。石墨作为强化材料的添加剂,可有效提升强化材料的传热性能,具有实际工程的应用价值。     

Influence of heat treatment on fracture and magnetic properties of radially oriented Sm2Co17 permanent magnets

The quenching, fracture and aging treatment of radially oriented Sm2Co17 ring magnets were investigated. The results indicate that the ring magnets have obvious anisotropy of thermal expansion, which easily leads to the splits of the magnets during quenching. The fracture is brittle cleavage fracture. The difference （Aa） of the expansion coefficient reaches the maximum value at 800-850 ℃. So, various quenching processes at different steps are adopted in order to reduce the splits. When the magnets are aged, 1：5 phase precipitates from the 2：17 matrix phase and forms a cellular microstructure with 2：17 phase. BHmax and JHc reach the maximum value 226 kJ/m^3 and 2 170 kA/m after being aged at 850 ℃ for 4 h and 8 h, respectively. The aging treatment at 850 ℃ has little influence on remanence（Br）, which can always keep a high value （≥1.0 T）. Through appropriate heat treatment, the ring magnets have uniform cellular microstructure and excellent magnetic properties： Br ≥ 1.0T, JHc ≥2 100 kA/m, BHmax ≥ 220 kJ/m^3.     

复合变质处理对铸造热锻模具钢力学性能的影响

研究了变质处理对铸造热锻模具钢力学性能的影响。结果表明：在相同热处理条件下，经RE和RE—Nb复合变质处理后，其冲击韧性与变质处理前相比分别提高了9．7和14．5J／cm^2，常温抗拉强度σb分别提高了82和234MPa，高温抗拉强度分别达到了976和994MPa，而硬度变化不大。