ALC废渣的活化及其在加热过程中的物理化学变化

用ＴＧ－ＤＴＡ、ＩＲ,ＸＲＤ和ＮＭＲ等方法对ＡＬＣ（压蒸轻质硅酸盐板材）废渣中添加氢氧化钙后的ＡＬＣ－ＣＨ混合系统,在室温到１０００℃范围内加热过程中的物理化学变化进行测定分析。结果表明,该系统在加热过程中β－ＣＳ于６００－７００℃之间开始形成,８５０－１０００℃之间大量形成,说明可以通过添加Ｃａ（ＯＨ）２后再直接加热处理的方法使ＡＬＣ渣活化。在加热过程ＡＬＣ中的硅酸盐阴离子首先经历Ｓｉ－Ｏ键的断     

Polarographic study of the system containing cadmium(II) and cobalt(II) and TTHA reagent

Polarographic study of the substitution reaction between cadmium(II) complex with Triethylenetetramine-N, N, N′, N″, N?, N?-hexaacetic acid (TTHA = H₆L) and cobalt(II) ion is described. According to the amperometric titration curves and polarograms, the existence of mixed binuclear complex and a new wave (Wave P appears above pH 4.5, ?0.8～?0.9 V. vs sce) involved in the reactions between two different metal ion (Cd(II) and Co(II) and TTHA was presented. The mixed complex [CdLCo]^2? then decomposed forming slowly the complex CdHL^3? and Co²⁺, as expressed by the reactions

and binuclear complexes were formed according to the reactions.

The logarithmic formation constant, K^Cd_CdLCo was calculated to be 8.10 using (1) and the known values of log K^H_CoHL = 8.12, log α_Cd(OAc) = 0.46 and log K′_CdLCo = 4.32 at pH 4.80.

The calculated value verified the proposal of mixed binuclear complex formation is low compared to log K^Cd_CdLNi = 9.2. The mixed complexes of TTHA reagents are stable species compared with binuclear type of EDTA complexes which exist only as reaction intermediates.The electrode reaction of wave P is proposed.

The species: CoL^4? obtained has a strong adsorption on the dropping mercury electrode.     

复配抑菌剂对单增李斯特菌的抑制作用及其保鲜效果

研究溶菌酶、甘氨酸和乙酸钠对单增李斯特菌的抑制效果,通过单因素抑菌率的结果,运用响应面法优化三种抑菌剂复配后对单增李斯特菌的抑制效果,并且将得到的最优浓度复配抑菌剂用来保鲜感染了单增李斯特菌的三文鱼,以细菌总数、单增李斯特菌数、pH、TBA值和TVB-N值为指标,研究复配抑菌剂的保鲜效果。结果表明:溶菌酶0.6 g/L、甘氨酸浓度为6.4 g/L、乙酸钠浓度为4.9 g/L为复合保鲜剂的最佳配比,此条件下对单增李斯特菌的抑菌率为80%±0.23%。冷藏条件下,经复配抑菌剂处理后的三文鱼品质优于未经处理的空白组,第7 d时,实验组细菌总数、单增李斯特菌数、pH、TBA值和TVB-N值分别为5.56 lg CFU/g、4.65 lg CFU/g、6.78、1.048 mg MDA/kg、18.03 mg N/100 g,相比空白组,能延长2 d的货架期。      

Study of wind-toughness of metal arc welding with reference to multi-pass weld metal quality

The maximum cause to make mechanical toughness of a weld metal reduce in process management is known to be a mixture of nitrogen including in the atmosphere by breaking the shield condition. Mixture of the atmosphere is prevented by blowing the shielding gas such as carbon dioxide, argon, and this mixture to the arc and the molten pool in gas metal arc welding, but it is easily affected by wind. Therefore, it has been recommended conventionally that wind velocity should be controlled to less than 2.0 m/s. But it is thought that this recommendation value is unsuitable to produce multi-pass weld metal with high mechanical and porosity toughness properties because this was provided from examination results by only consideration of porosity toughness of single-pass weld metal but non-consideration mechanical toughness. In this paper, the shielding condition is evaluated not only chemical analysis and mechanical properties of multi-pass weld metal in some velocity wind environment but also visualizing varied shielding gas behaviour by the Schlieren method. As a result, it is necessary to control the wind velocity to less than 0.5 m/s to produce multi-pass weld metal with good properties. And the calculated velocity of shielding gas should be controlled to more than twice the wind velocity.     

Elasto‐plastische Schubverformungen und Schubversagen kurzer Stahlstützen

Elasto‐plastic shear deformation and fracture behaviors of short steel stanchions. Short steel stanchions with various width‐to‐thickness ratios of flange and web under axial compression are clarified experimentally as well as analytically. There exists a critical value of shear span ratio _Gr(H/h) between shear and bending yield of wide flange steel stanchions. Shear yielding of short steel columns shows no Lüders's lines but very many small protuberance particles up to parallelogram deformed web surfaces. There exists a fundamental large difference between shear and bending yield behaviors of wide flange steel stanchions. Finally the critical shear span ratio of wide flange steel profile will be derived analytically and through experiment proved.     

Destruction of gaseous pollutants by surface-induced plasmachemical process (SPCS)

The surface discharge-induced plasma chemical process (SPCP) has great advantages in the destruction of various gaseous pollutants (NO _x, SO_x, CO, Freons, etc.), air toxicants (Hg vapor, hazardous solvent vapors, etc.), and odors because of its unique features: a very strong decomposition capability for stable contaminant gases, its compact size, and its low cost. A ceramic-made reactor is used for generation of high-frequency surface discharge to produce a planar plasma region over its surface. The gas containing pollutants is contacted in this region and exposed to copious radicals (OH, O, O₃ , N, NH₂, NH, H, etc.) to be decomposed of or oxidized. This process has a very wide application range: from diesel engines, industrial furnaces, incinerators, and food processors to larger industrial boilers. The first application of SPCP was extremely small ozonizers with very high performance, but a number of new application fields are being developed     

DC conduction and electrical breakdown of MgO/LDPE nanocomposite

To understand basic electric properties of nano-sized magnesium oxide (MgO) / low-density polyethylene (LDPE) nanocomposite under DC voltage application, the volume resistivity, the space charge distribution and the breakdown strength were investigated. By the addition of nano-sized MgO filler, both the DC breakdown strength and the volume resistivity of LDPE increased. At the average DC electric field of about 85 kV/mm and more, a positive packet space charge was observed in LDPE without MgO nano-filler, whereas a little homogeneous space charge was observed in MgO/LDPE nanocomposite material at the front of electrode. From these results, it is confirmed that the addition of MgO nano-filler leads to the improvement of DC electrical insulating properties of LDPE.     

Structural Degradation of Tobermorite during Vibratory Milling

Mechanochemistry of hydrothermally prepared Al-free and Al-substituted 1.1 nm tobermorite was studied using ²⁹Si NMR, XRD, and TGA-DTA. Tobermorite has a double-chain structure and Al/Si substitution occurs preferentially at bridging tetrahedra. By using the vibration mill, both tobermorites were observed to decompose as a function of milling time to form amorphous C-S-H-like phases. The decomposition rate was higher for the Al-substituted tobermorite. The decomposition process occurs mainly at the bridge portion of the silicate double chain. In the Al-substituted tobermorite, the breakage seems to occur preferentially at the points where Al has replaced Si. On heating the amorphous C-S-H-like phase, wollastonite is formed. However, no decrease was observed at the wollastonite formation temperature.