摘要：石油化工企业对设备的运行可靠性要求很高,这样的连续化生产企业在设备管理上基本都要把设备运行的可靠性放在首位。采用现代设备管理理论的科学管理决策方法,根据石油化工企业的实际情况,对石油化工设备管理进行全面系统的研究,提出了基于可靠性的石油化工公司设备维修的有效措施。

摘要：目的探讨不同血压分层对糖尿病人群肾功能的影响。方法采用前瞻性队列研究设计,以2006年7月-2007年10月参加健康查体的101510名开滦集团职工中9489例糖尿病患者作为观察队列,随访(8.6±4.0)年。依据基线血压水平将研究人群分为正常血压(收缩压<120 mmHg、舒张压<80 mmHg)、血压升高(收缩压120~130 mmHg、舒张压<80 mmHg)、高血压1级[收缩压130~140 mmHg和(或)舒张压80~90 mmHg]、高血压2级[收缩压≥140 mmHg和(或)舒张压≥90 mmHg]4组。比较各组人群的慢性肾脏病(CKD)的发病密度。采用多变量Cox比例风险回归模型分析不同血压对糖尿病人群肾功能的影响,采用多变量时间依赖性Cox比例风险模型分析结果的稳定性,并排除随访期间发生心血管事件(CVD)、基线服用降压药和基线服用降糖药后进行敏感性分析。结果(1)在基线水平,高血压1级组患者年龄、体重指数(BMI)高于正常血压组患者,差异有统计学意义(P<0.05)。(2)至随访结束时,发生CKD 2294例,其中估算肾小球滤过率(eGFR)下降1117例,尿蛋白1575例,高血压1级组CKD的发病密度为39.4/千人年,eGFR下降发病密度为16.3/千人年,尿蛋白发病密度为25.5/千人年,与正常血压组比较差异均有统计学意义(log-rank检验,P<0.01)。(3)多因素Cox比例风险回归模型分析显示,与正常血压比较,高血压1级可使糖尿病人群发生CKD的风险增加29%(HR=1.29,95%CI 1.09~1.52)、eGFR下降的风险增加40%(HR=1.40,95%CI 1.08~1.80)。结论高血压1级(≥130/80 mmHg)即可增加糖尿病人群发生CKD和eGFR下降的风险,且eGFR下降的风险更大。

摘要：单钢板混凝土剪力墙结构是钢-混凝土组合剪力墙结构形式中的一种,可通过钢结构与钢筋混凝土结构的协同工作,充分发挥各自的优势。在钢筋混凝土剪力墙结构中配置端部型钢和钢板,会造成钢结构与混凝土结构相互交叉影响,改变钢筋混凝土剪力墙的施工工艺,因此要提前策划、采取应对措施,在满足结构设计和规范要求的前提下,做到钢结构快速精准安装,为后续插入钢筋绑扎工程创造条件,合理预留与钢筋工程的连接条件。钢筋骨架设置于钢结构外侧,要解决钢筋垂直于钢结构受到阻挡时采取的穿越/连接节点作法,以及整体钢筋施工工艺的梳理,使钢筋绑扎工程能够既符合要求,又能快速、有序安装,提高功效、保证质量。

摘要：利用包钢高炉重矿渣碎石粗集料和石灰岩细集料,设计制备了C-C-2级配水泥稳定基层混合料,进行了其强度及抗冻性能研究。结果表明,水泥(PO32.5)剂量为3%时,C-C-2重矿渣水泥稳定混合料的7 d无侧限抗压强度可以达到5.0 MPa以上。随着水泥剂量的增加,混合料的7 d无侧限抗压强度增大。水泥剂量为4%时,C-C-2重矿渣水泥稳定混合料的最大干密度最大,同时,对于提高重矿渣水泥稳定混合料的180 d抗压强度和抗冻性能效果显著。

摘要：预制梁钢筋骨架技术可提高地下工程的施工效率和质量,但是也面临着技术标准不统一、设计与制造的一体化、运输和安装、质量控制和监测、经济可行性等多种问题和挑战。在此背景下,本研究以南京市建宁西路过江隧道江南工作井环梁施工项目为依托,介绍了基坑预制环梁钢筋骨架技术,并针对工作井第2~8道环梁开展了相关研究,取得了一系列研究成果,包括超长预制环梁钢筋骨架吊装施工、吊装方案的计算和选择以及拼接标准的制订等,为地下工程预制梁钢筋骨架技术的发展提供了参考。

摘要：通过设计太阳能专用球阀新型结构,改进表面强化工艺,增加超洁净控制的软硬件投入,对洁净球阀进行了强度试验工况、密封试验工况以及温度场仿真分析。并对洁净球阀的加工过程提出质量控制要求。

摘要：为建立一种快速检测赤狐皮毛的方法,试验根据赤狐皮毛线粒体COX3基因保守区设计了特异性引物和Taq Man探针,通过优化反应条件建立了一种检测赤狐皮毛的Taq Man探针荧光PCR检测方法。结果表明,该方法对赤狐皮毛具有特异性,不与兔皮毛、山羊皮毛、绵羊皮毛、貂皮毛和貉子皮毛发生交叉反应。该方法对质粒标准对照(PUC-VV-)的最适线性检测范围为4.8×10^(1)~4.8×10^(8) copies/μL,标准曲线方程为Y=-3.4752X+40.118,相关系数(r^(2))为0.9897,检测下限为48 copies/μL。对3个不同浓度的pCR-GPTV-ITR进行组内试验和组间试验,每个浓度的重复试验Ct值的变异系数均小于1.5%,具有良好的重现性。采用该方法检测2份赤狐皮毛为阳性,其他10份动物皮毛样品为阴性。本方法的建立为赤狐皮毛检测提供了一种快速准确的技术手段。

摘要：This paper proposes a design of passive cooling system for CPR1000 spent fuel pool(SFP). Our design can effectively manage the SFP temperature not to exceed80 C. Then the transient analysis of the CPR1000 SFP with designed passive cooling system is carried out in station blackout(SBO) accident by the best-estimate thermal-hydraulic system code RELAP5. The simulation results show that to maintain the temperature of CPR1000 SFP under 80 C, the numbers of the SFP and air cooling heat exchangers tubes are 6627 and 19 086, *** height difference between the bottom of the air cooling heat exchanger and the top of the SFP heat exchanger is3.8 m. The number of SFP heat exchanger tubes decreases as the height difference increases, while the number of the air cooling heat exchanger tubes increases. The transient analysis results show that after the SBO accident, a stable natural cooling circulation is established. The surface temperature of CPR1000 SFP increases continually until 80 C, which indicates that the design of the passive air cooling system for CPR1000 SFP is capable of removing the decay heat to maintain the temperature of the SFP around 80 C after losing the heat sink.

摘要：Inspired by the idea that bionic non-smooth surfaces(BNSS) can reduce fluid adhesion and resistance, and the effect of bionic V-riblet non-smooth structure arranged in tire tread pattern grooves surface on anti-hydroplaning performance was investigated by using computational fluid dynamics(CFD). The physical model of the object(model of V-riblet surface distribution, hydroplaning model) and SST k-ω turbulence model were established for numerical analysis of tire hydroplaning. With the help of a orthogonal table L16(45), the parameters of V-riblet structure design compared to the smooth structure were analyzed, and obtained the priority level of the experimental factors as well as the best combination within the scope of the experiment. The simulation results show that V-riblet structure can reduce water flow resistance by disturbing the eddy movement in boundary layers. Then, the preferred type of V-riblet non-smooth structure was arranged on the bottom of tire grooves for hydroplaning performance analysis. The results show that bionic V-riblet non-smooth structure can effectively increase hydroplaning velocity and improve tire anti-hydroplaning performance. Bionic design of tire tread pattern grooves is a good way to promote anti-hydroplaning performance without increasing additional groove space, so that tire grip performance and roll noise are avoided due to grooves space enlargement.

摘要：A catalyst of ferroelectric-BaTiO_(3)@photoelectric-TiO_(2) nanohybrids(BaTiO_(3)@TiO_(2))with enhanced photocatalytic activity was synthesized via a hydrolysis precipitation combined with a hydrothermal *** to pure TiO_(2),pure BaTiO_(3) and BaTiO_(3)/TiO_(2) physical mixture,the heterostructured BaTiO_(3)@TiO_(2) exhibits significantly improved photocatalytic activity and cycling stability in decomposing Rhodamine B(RhB)and the degradation efficiency is 1.7 times higher than pure TiO_(2) and 7.2 times higher than pure BaTiO_(3).These results are mainly attributed to the synergy effect of photoelectric TiO_(2),ferroelectric-BaTiO_(3) and the rationally designed interfacial *** mesoporous microstructure of TiO_(2) is of a high specific area and enables excellent photocatalytic *** ferroelectric polarization induced built-in electric field in BaTiO_(3) nanoparticles,and the intimate interfacial interactions at the interface of BaTiO_(3) and TiO_(2) are effective in driving the separation and transport of photogenerated charge *** strategy will stimulate the design of heterostructured photocatalysts with outstanding photocatalytic performance via interface engineering.