金属矿床可视化与储量计算应用研究

数字矿山作为一种趋势已经在国内取得显著进展,建立矿床的三维模型不仅直观反映了矿体空间形态,也为矿床储量的计算提供了条件。运用DIMINE数字矿山软件,在建立某金属矿床的地质数据库和矿体三维实体模型的基础上,建立了矿体的块段模型,然后采用距离幂次反比法,推估出该矿山的金属元素品位,并计算出矿床资源储量。计算结果表明,借助DIMINE软件进行品位推估和储量计算不但过程简便快捷,而且结果可靠。     

采用核磁共振方法表征重质油结构

采用700 MHz高场核磁谱仪建立了由核磁共振波谱(NMR)获取重质油H、C原子分布与结构参数的分子结构表征方法。以减压馏分油(VGO)和减压渣油(VR)为研究对象,对13C NMR实验条件进行优化, 并考察了1H NMR 和13C NMR实验重复性和准确性。结果表明,较优的13C NMR实验条件是样品质量分数为100%、30°脉冲倾倒角下的延迟时间为50 s;1H NMR和13C NMR实验的6次重复实验的实验标准差分别为086%、136%,1H NMR和13C NMR实验测定重质油中H、C原子分布的准确性误差均在±10%以内。     

涟钢板坯连铸轻压下技术的研究与应用

涟钢1号连铸机采用动态轻压下技术生产时,轻压下效果不佳,中心疏松和中心偏析达均到2．0级。通过射钉试验发现,实际液芯长度比模型计算长度短约1．6～4．2m,故对铸机凝固末端预报进行了参数化修正,并在基础辊缝的基础上确定了正常与非正常浇铸条件下的轻压下参数,优化后的轻压下使铸坯中心疏松和中心偏析降到0．5级,铸坯横断面上不同位置的C、Mn含量也非常均匀,满足工艺要求。     

利用MathCAD进行耐火内衬的传热计算

介绍了利用MathCAD进行耐火内衬各个界面、外壁温度的计算,说明MathCAD是工程设计在选择耐火材料和耐火衬厚准确、快捷的工具。     

偶联剂含量对纳米SiO2/EP复合涂料防护性能的影响

为提高涂料的屏蔽性能,本研究采用乙烯基三(β-甲氧基乙氧基)硅烷偶联剂对纳米SiO2表面进行改性,并用显微镜分析了SiO2在母液中的分散,应用自由膜静态浸泡法研究了水在涂层中的传输行为。结果表明:母液中乙烯基三(β-甲氧基乙氧基)硅烷偶联剂含量为3.5%以上时,纳米SiO2在母液中可以有效分散;当母液中偶联剂的含量为3.5%～4%时,水在涂层中的传输速率最低,涂层的屏蔽性能最佳,其防护性能最好。     

油茶饼粕生物吸附剂对Ni2+的吸附性能

为充分利用油茶资源,采用醇提、超声辅助醇提、水提和超声辅助水提方法,提取油茶饼粕中的茶皂素,考察了提取剩余物作为油茶饼粕生物吸附剂的可行性和机理.研究表明,超声辅助醇提茶皂素提取率最高,达到19.63%,5种牛物吸附剂吸附Ni2+均可在25 min之内达到吸附平衡,各吸附剂对Ni2+的等温吸附线更符合Langmuir等...     

A new Pb(Lu1/2Nb1/2)O3–PbZrO3–PbTiO3 ternary solid solution with morphotropic region and high Curie temperature

A ceramic ternary system of (1?x?y)Pb(Lu_1/2Nb_1/2)O₃–xPbZrO₃–yPbTiO₃ (PLuN–PZ–PT) has been prepared by two-step synthetic process and characterized by X-ray powder diffraction and electric measurements. A morphotropic phase boundary (MPB) region has been delimited in the ternary system at room temperature. With the PLuN content increasing, the morphotropic phase boundary region becomes broad as well as the dielectric peak. The best comprehensive piezoelectric properties were achieved at MPB composition 0.42PLuN–0.1PZ–0.48PT, with the piezoelectric coefficients d₃₃, the Curie temperature T_c, the planar electromechanical coupling factor K_p, and the remnant polarizations P_r being 367 pC/N, 360 °С, 68% and 35 μС/cm², respectively. The results indicate that the PLuN–PZ–PT ternary ferroelectric material may be a promising candidate for high-power electromechanical transducers that can operate in a large temperature range.     

Adhesion and Physicochemical Properties of Soy Protein Modified by Sodium Bisulfite

Soy protein adhesives with a high solid content (28–39 %) were extracted from soy flour slurry modified with sodium bisulfite (NaHSO₃) at different concentrations. 11S‐dominated soy protein fractions (SP 5.4) and 7S‐dominated soy protein fractions (SP 4.5) were precipitated at pH 5.4 and pH 4.5, respectively. The objective of this work was to study the effects of NaHSO₃ on adhesion and physicochemical properties of soy protein. The adhesion performance of NaHSO₃‐modified SP 4.5 was better than SP 5.4; the wet strength of these two fractions was from 2.5 to 3.2 MPa compared with 1.6 MPa of control soy protein isolate. SDS‐PAGE results revealed the reducing effects of NaHSO₃ on soy protein. The isoelectric pH of soy protein decreased as NaHSO₃ increased due to the induced extra negative charges (RS‐SO₃^?) on the protein surface. The rheological properties of soy protein adhesives were improved significantly. Unmodified samples SP 5.4 and SP 4.5 had clay‐like properties and extremely high viscosity, respectively; with 2–8 g/L NaHSO₃ modification, both SP 5.4 and SP 4.5 had a viscous cohesive phase with good flowability. Overall, NaHSO₃‐modified soy protein adhesives in our study have many advantages over the traditional soy protein isolate adhesive such as better adhesion performance, higher solid content but with good flowability and longer shelf life.     

凉凉隔热胶在石油储运设备上的应用

介绍了一种改变传统的隔热降温材料－采用薄涂膜层的形式,达到良好效果的ＤＴ－２２凉凉隔胶及其成分、性能和施工工艺。该隔热胶具有较好的实用性和较强的推广价值。     

低频爆破震动对岩石介质破坏机理研究

基于小波包爆破地震能量分析法和损伤力学基本理论,对低频爆破震动对岩石的破坏作用进行了分析,提出了震动对岩石的拉压损伤作用理论,从能量角度解释了岩石破坏原因,克服以往岩石破坏判据单一的缺陷,得出低频爆破震动破坏岩石的普遍理论,为以后进一步研究提供了依据。