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71.
职业性铅接触对血压影响的研究 总被引:3,自引:0,他引:3
对118名铅接触工人及108名对照组工人的血压研究发现,在血铅为44.26μg/dL时,铅接触工人的收缩压显著高于对照组,分组研究发现,收缩压在级组剂量-反应关系趋势,在血铅30.20μg/dL,收缩压显著高于对照组,多元逐步回归分析发现,在控制一些其他影响血压的因素后,铅接触工人的血铅水平与收缩压和舒张压均有剂量-反应关系。 相似文献
72.
超临界萃取装置的研制及其应用 总被引:5,自引:0,他引:5
超临界流体萃取是近的上来兴起的一种新的分离技术,报道了将超临界萃取原理与回流技术相结合研制的二氧化碳回流中低压超临界流体萃取设备,解决了关键实验手段,通过应用证明设备可靠,费用低廉,有实用价值。 相似文献
73.
Yue Ming Zhou Jian Hua Ding Xie Zhang Huan Wen Chen 《中国化学快报》2007,18(1):115-117
Extractive electrospray ionization source(EESI)was adapted for ion-ion reaction,which was demonstrated by using a linear quadrupole ion trap mass spectrometer for the first ion-ion reaction of biopolymers in the atmospheric pressure ambient. 相似文献
74.
The silver iodate(VII), Ag5IO6, was obtained by reacting a stoichiometric mixture of Ag2O and KIO3, at elevated oxygen pressure, adding a small portion of distilled water. The synthesis was done at 673 K and 270 MPa of oxygen pressure. The crystal structure was solved by direct methods based on single crystal diffraction data ( , Z = 6, a = 5.9366(1), c = 32.1471(6) Å, 323 independent reflections, R1 = 2.31 %). According to conductivity measurements, Ag5IO6 is semiconducting with a specific resistance of 0.08 Ωcm at 300 K. The activation energy was determined as 7.4(1) meV in the temperature range of 220 – 300 K, and 4.3(1) meV in the temperature range of 90 – 180 K. The optical band gap for Ag5IO6 is 1.4 eV. Ag5IO6 is diamagnetic with a magnetic susceptibility of ?4.4×10?4 emu/mol. 相似文献
75.
Inversion of the temperature coefficient of internal pressure in liquid phase systems is considered. Both temperature and concentration inversions of the coefficient are shown to be possible. Details of the temperature inversion are discussed. This type of inversion is characteristic of only associated hydrogen-bonded liquids and is due to weaker association of molecules. 相似文献
76.
Yoshitsugu Kojima Takaaki Matsuoka Norio Sato Hideroh Takahashi 《Journal of polymer science. Part A, Polymer chemistry》1995,33(17):2935-2940
New conjugated oligomers were prepared by reacting phenylacetylene under high pressure of 0.11 to 0.92 GPa at 100–200°C for 0–5 h. The number-average molecular weight M?n, the weight-average molecular weight M?w, and the oligomer yield increased with pressure, tem-perature, and time. The average molecular weight of the oligomer showed the maximum value (M?n: 830, M?w: 2400) under 0.92 GPa, the maximum pressure, where phenylacetylene was oligomerized at a constant temperature. The structure of the oligomer was investigated from ESR, infrared, UV–VIS, field desorption mass (FDMS) spectra, and 13C NMR spec-trum. Analysis of the FDMS spectrum revealed that the molecular weight of the oligomer was multiple of the monomer. 13C NMR spectrum of the oligomer showed the absence of sp-carbon (? C?). We found that the oligomer had a cyclic structure. The cyclic oligomers of pentamer or more were new compounds. © 1995 John Wiley & Sons, Inc. 相似文献
77.
Using both spreading techniques — mixed spreading and separate spreading- and, simultaneously, film pressure and film potential measurements, the mixing behavior of the following five binary systems was investigated and compared: 1) system 1,2-dilauroyl-phosphatidylethanolamine/cholesterol; 2) system 1,2-dimyristoyl-phosphatidylethanolamine/cholesterol; 3) system 1,2-dipalmitoyl-phosphatidylethanolamine/cholesterol; 4) system Na-eicosyl sulphate/hexadecanol; 5) system phosphatidic acid/1,2-dimyristoyl-phosphatidylethanolamine.Analyzing the time and concentration dependence of the /a isotherms and v/a isotherms (s = film pressure, v
s potential,a=average area per molecule in mixed films in the monolayers) of the binary monolayers it can be concluded that the components of the binary systems 1–4 are complete miscible in the monolayers. On the other hand the components of the system 5 are probably partially miscible only. 相似文献
78.
An adsorption heat pump system using a new binary coupling adsorptive cycle is developed and tested. Experimental results show that the COP of the binary coupling cycle is higher than that of a pure zeolite-water system. The system operating pressure is found to be moderate (close to the ambient pressure) when a proper concentration of ammonia is used in the system. The moderate operating pressure of the new coupling cycle results in low leakage to the system, achieving long life and the light design of the system vessels. The use of the new binary adsorption cycle greatly improves the feasibility and reliability of the adsorption heat pumps, providing essential benefits for the industrialisation of adsorption heat pumps. 相似文献
79.
80.
Chemical Bonding and Pressure‐Induced Change of the Electron Configuration of Ytterbium in β‐YbAgGa2
Ulrich Schwarz Marcus Schmidt Roman Gumeniuk Walter Schnelle Michael Hanfland Konstantin Klementiev Yuri Grin 《无机化学与普通化学杂志》2004,630(1):122-126
Single‐phase polycrystalline samples of the intermetallic compound β‐YbAgGa2 were synthesized by inductive heating and subsequent annealing for eight weeks at 670 K. Magnetic properties were characterized by susceptibility measurements and indicated intermediate valence of ytterbium at ambient pressure. Angle‐dispersive X‐ray powder diffraction data of orthorhombic β‐YbAgGa2 indicate stability of the phase in the investigated pressure range from 0.1 MPa (ambient pressure) to 19 GPa. The pressure‐induced volume decrease is accompanied by an increase of the effective valence from 2.17 at ambient conditions to 2.71 at 16 GPa as evaluated by X‐ray absorption spectroscopy at the Yb LIII threshold. Analysis of the chemical bonding in β‐YbAgGa2 by integrating the electron density of the polyanion in basins as defined by the electron localization function results in an electron count Yb2.7+[(Ag0.2—)(Ga1(3b)1.0—)(Ga2(4b)1.5—)]. This finding is close to the expected values calculated by means of the Zintl rules and fits well the results of magnetic susceptibility measurements and XAS investigations. 相似文献