Research on Design and Performance of Self-Compacting Cement Emulsified Bitumen Mixture (CEBM)

To meet the needs of the road industry for maintenance operations, a new cement emulsified bitumen mixture (CEBM) with early-strength, self-compacting, and room-temperature construction characteristics was designed. The strength formation mechanism of CEBM was revealed with a scanning electron microscope (SEM) and the surface free energy (SFE) theory. The mechanical properties and road performance of the CEBM were investigated extensively. The results show that before the demulsification of emulsified bitumen, the SFE of the bitumen–aggregate–water three-phase system was reduced due to the replacement of the bitumen–aggregate interface with water. The adhesion work between the emulsified bitumen and the aggregate is negative, which means the adhesion between the emulsified bitumen and the aggregate will not occur spontaneously due to the existence of water. The liquid emulsified bitumen improves the workability of the mixture and ensures that the mixture can be evenly mixed and self-compacted. After demulsification, the work of adhesion between the residual bitumen and the aggregate is positive, which means residual bitumen and aggregate can bond spontaneously. In addition, the hydration products of cement and aggregate form a skeleton, and the emulsified bitumen film wraps and bonds the cement and aggregate together, creating strength. The emulsified bitumen, cement content, and curing conditions have significant effects on the stability of CEBM. The recommended dosage of emulsified bitumen and cement is 8% and 8–10%, respectively. This material integrates the hardening effect of cement and the viscoelastic performance of bitumen and has good workability, mechanical properties, and road performance. Therefore, the CEBM is technically feasible for application to bitumen pavement.     

实验室信息管理系统的技术与应用进展

实验室信息管理系统(LIMS)自问世以来,在世界范围内取得了令人惊叹的技术进展和应用成就。该文从现代化实验室实施LIMS的意义,LIMS主要的技术发展阶段,目前国内LIMS的应用情况,分析测试性实验室在实施LIMS后预期达到的目标,以及当前LIMS项目实施中存在的问题和应用前景等方面进行综述。     

正常中国汉人红细胞中儿茶酚氧位甲基转移酶的活性测定

目的测定正常中国人群红细胞儿茶酚氧位甲基转移酶(COMT)活性浓度值,为研究COMT活性变化在疾病诊断中的应用提供依据。方法采用高效液相色谱法测定279名正常健康人(其中男性134例,女性145例)红细胞中COMT的活性浓度,用SPSS统计软件对性别间测定结果进行检验比较。结果男性和女性红细胞中COMT活性浓度分别为:(16.5±7.4)、(15.5±5.3)nmol.mL RBC-1.h-1。活性频率分布男性在6.0~37.4nmol.mL RBC-1.h-1,女性为5.4~37.2 nmol.mL RBC-1.h-1,男女之间COMT活性浓度的差异无统计学意义(P>0.05)。结论本法灵敏,简便,准确,重复性好,且测定结果与国外一些报道一致,适用于临床应用测定研究。本结果可作为中国健康人红细胞COMT活性正常值及今后研究的重要参考数据。     

开塞露灌肠治疗产后尿潴留的临床观察

目的:探讨开塞露灌肠对产后尿潴留的临床应用价值。方法:对60例产后尿潴留患者,随机抽取32例为治疗组,28例为对照组。治疗组用开塞露保留灌肠治疗尿潴留;对照组单纯采用新斯的明肌肉注射。结果:治疗有效率治疗组为100%,对照组为64.3%,P<0.01。结论:开塞露灌肠效果明显高于单纯注射新斯的明,两组有显著差异。     

固相法合成心肌兴奋肽及其类似物

用Boc-和Tos-基团分别保护氨基和侧链胍基,以1%交联度聚苯乙烯二苯甲氨基树脂为载体,用DCC固相法合成肽,HF断裂肽树脂键和去除侧链保护基团,粗产物经高效液相层析纯化,合成了心肌兴奋肽Phe-Met-Arg-Phe-NH_2及其类似物Phe-Pro-Arg-Phe-NH_2,并观察了此二种肽对大鼠血压和心率的影响。     

焦谷氨酸油醇酯促进药物经皮吸收活性的研究及其合成

用谷氨酸和油醇合成焦谷氨酸油醇酯。在该化合物作用下替硝唑、咖啡因和 醋酸可的松经皮渗透分别增大了41．8、9．1和2．9倍。     

大鼠肠道菌群对长梗冬青苷体外代谢的影响

摘 要 目的：探究体外孵育的大鼠肠道菌群对长梗冬青苷的代谢转化规律。方法: 将长梗冬青苷与大鼠肠道菌群在厌氧条件下共孵育,分别于0,4,8,12,24,48 h时取样,经乙酸乙酯萃取后采用HPLC法进行定性和定量分析。结果: 在与大鼠肠道菌群共孵育48 h后,90.8%的长梗冬青苷被代谢转化为M₂,M₂与铁冬青酸对照品通过HPLC分析时色谱行为一致,故确定M₂为铁冬青酸。结论:长梗冬青苷可以被体外孵育的大鼠肠道菌群代谢转化为铁冬青酸。     

Increasing nodal vulnerability and nodal efficiency implied recovery time prolonging in patients with supplementary motor area syndrome

Supplementary motor area (SMA) syndrome is a surgery‐related complication that commonly occurs after removing SMA glioma, and needs weeks to recover. However, susceptible factors of patients suffering from SMA syndrome remain unknown. Graphic theory was applied to reveal topological properties of sensorimotor network (SMN) by processing resting‐state functional magnetic resonance images in 66 patients with SMA gliomas. Patients were classified into SMA and non‐SMA groups based on whether they suffered from SMA syndrome. We collected recovery time and used causal mediation analysis to find association between topological properties and recovery time. Compared with the non‐SMA group, higher vulnerability (left: p = .0018; right: p = .0033) and lower fault tolerance (left: p = .0022; right: p = .0248) of the whole SMN were found in the SMA group. Moreover, higher nodal properties of lesional‐hemispheric cingulate cortex (nodal efficiency: left, p = .0389; right, p = .0169; nodal vulnerability: left, p = .0185; right, p = .0085) and upper limb region of primary motor cortex (PMC; nodal efficiency: left, p = .0132; right, p = .0001; nodal vulnerability: left, p = .0091; right, p = .0209) were found in the SMA group. Nodal efficiency and nodal vulnerability of cingulate cortex and upper limb region of PMC were important predictors for SMA syndrome occurring and recovery time prolonging. Neurosurgeons should carefully deal with upper limb region of PMC and cingulate cortex, and protect them if these two region were unnecessary to damage during SMA glioma resection.     

A Comprehensive Study on the Rejuvenation Efficiency of Compound Rejuvenators for the Characterization of the Bituminous Binder,Mortar, and Mixture

This study aims to comprehensively investigate the rejuvenation efficiency of various self-developed compound rejuvenators on the physical, mechanical, and aging properties of aged bitumen, asphalt mortar, and mixture. The results revealed that the restoration capacity of vacuum distilled-oil rejuvenators on high-and-low temperature performance-grade of aged bitumen is more significant. In contrast, an aromatic-oil based rejuvenator is good at enhancing low-temperature grade and aging resistance. Moreover, the temperature and time of the curing conditions for mixing recycling of asphalt mixture were optimized as 150 °C and 120 min. Furthermore, the sufficient anti-rutting, structural stability, and moisture resistance of recycled asphalt mixture affirmed the rejuvenation efficiency of compound rejuvenators.