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181.
The deactivation of a commercial Selective Catalytic Reduction (SCR) catalyst, of V2O5−WO3/TiO2 type, has been studied through comparisons with results from a full-scale biomass combustion plant to that with laboratory
experiments. In the latter, the catalyst was exposed to KCl and K2SO4 by both wet impregnation with diluted salt solutions and deposition of generated submicrometer aerosol particles by means
of an electrostatic field. The reactivity of fresh and deactivated samples was examined in the SCR reaction. Chemical and
physical characterizations were focusing on internal structures and chemical composition. Deposition of submicrometer sized
particles on the monolithic SCR catalyst was shown to induce deactivation with characteristics resembling those obtained in
a commercial biomass combustion plant. 相似文献
182.
在相同的乳胶基质中分别添加0%、2%、4%、6%和8%的KCl,再分别用膨胀珍珠岩和化学发泡剂敏化制备2组乳化炸药。测试各乳化炸药水中爆炸冲击波,得出它们未受压和受压后的爆炸冲击波压力峰值,利用波峰值计算乳化炸药的压力减敏度。依据压力减敏度数值,分析KCl含量对乳化炸药压力减敏作用的影响,并测试不同KCl含量下分散相的析晶点,分析不同KCl含量造成压力减敏变化的原因。结果表明:KCl含量在0%~2%之间时,乳化炸药的压力减敏度无明显变化,KCl含量在2%~8%之间时,KCl含量对乳化炸药的压力减敏度有较大影响,而且呈现出正线形相关性。 相似文献
183.
184.
This paper presents new experimental measurements of the thermal conductivity of aqueous solutions of NaCl and KCl at high pressures. The measurements were made with a parallel-plate apparatus. The temperatures covered the range from 293 to 473 K at pressures up to 100 MPa and concentrations from 0.025 to 0.25 mass fraction of NaCl and KCl. The measurements included 6 isobars at pressures from 0.1 to 100 MPa at intervals of 20 MPa, 10 isotherms at temperatures from 293 to 473 K at intervals of 20 K, and 6 isopleths at concentrations from 0.025 to 0.25 mass fraction of NaCl and KCl at intervals of 0.05. The precision of the measurements was ±1.6%. The thermal conductivity obtained for NaCl + H2O and KCl + H2O was compared with data of other authors, with satisfactory agreement. The viability of the technique was confirmed and the essential features of a high-precision instrument were established. 相似文献
185.
Friction force microscopy measurements on the vacuum‐cleaved (001) surfaces of KF, KCl and KBr have been carried out. All
surfaces exhibit atomically flat terraces with monatomic steps aligned preferentially along low‐index lattice directions.
Stick‐slip lateral forces with the lattice periodicity are observed on all surfaces. Tip‐sample contact creates higher friction
domains on the terraces of all three materials. The structure, topography and degree of friction force contrast of these domains
is material dependent. The dependence of friction upon load generally does not coincide with the behavior expected for an
elastic contact. We propose that the observed domains result from surface structural changes created by low load tip‐sample
contact on these relatively soft materials.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
186.
187.
188.
用He-Ne激光器、CCD和图像采集系统等仪器设备,搭建了数字激光全息干涉法测量液相质扩散系数的实验系统,并测试获得了浓度为0.33 mol/l KCl水溶液在298.15 K温度下的全息干涉图像,采用了图像增强、全息干涉条纹图再现及相位展开等数字图像处理过程的关键技术对全息干涉图进行处理,得到了相位展开后物光相位差,经换算后获得了该溶液的质扩散系数.为化工工程上研究替代制冷荆急需的质扩散系数测量提供了有效的方法. 相似文献
189.
An extended Kalman filter (EKF)‐based nonlinear quadratic dynamic matrix control (EQDMC) for an evaporative cooling draft‐tube baffled (DTB) KCl crystallizer is developed. The controller is used to maintain the productivity, crystal mean size and impurity of crystals. Since these controlled variables are not directly measurable, the EKF is used to estimate them. The nonlinear controller is a combination of an extended linear dynamic matrix control (EDMC) and the quadratic dynamic matrix control (QDMC). This combination provided good control of the system despite the process nonlinearity, constraints, and inadequate reliable online measurement of the controlled variables. The performance of the controller in the presence of plant/model mismatch, disturbance, wrong estimation and simultaneous step changes in the controller setpoints is discussed. 相似文献
190.
目的: 研究尼索地平对氯化钾(KCl)和去氧肾上腺素(phenylephrine, PHE)所致离体人子宫动脉收缩的影响。方法: 采用离体血管实验法,以KCl、PHE在含钙离子和不含钙离子的K-H液中预收缩离体人子宫动脉环,观察尼索地平对血管收缩的影响。 结果: 在含钙离子的K-H液中,尼索地平抑制KCl(50 mmol/L、80 mmol/L)所致血管收缩的IC50分别为(7.52±1.33)×10-9 mol/L和(2.75±0.53)×10-7 mol/L,尼索地平抑制PHE[(1×10-6)mol/L和(5×10-6)mol/L)]所致血管收缩的IC50分别为(6.17±1.21)×10-8 mol/L和(1.51±0.49)×10-6 mol/L。在无钙离子K-H液中,尼索地平无抑制离体血管收缩的作用。结论: 尼索地平对离体人子宫动脉的收缩有抑制作用。 相似文献