茅山断裂延伸带的初探

据区测队资料和卫星照片解释,江苏省南部溧水、高淳、金坛等县境内近南北走向的茅山山脉的东西两侧,皆有一条北北东向的大断层,茅山山脉是一个断裂带。1983年石油部门根据上党镇附近钻探资料,提出茅山断裂带可能向北延至镇江附近。笔者在镇江一带矿井地质调查时也证实这一推断,从     

哈尔滨松花江公路大桥建筑造型设计邀请赛

<正> 哈尔滨松花江公路大桥是目前国内最大的公路桥之一.它位于哈尔滨市松花江南岸河图街口,横跨松花江.主桥九孔全长748米,桥宽24米.主桥由黑龙江省公路勘察设计院设计.南岸引轿由哈尔滨市城建局设计技术研究所设计,采取双环剪刀形.总投资为一亿六千余万元.准备五年建成,现在正在进     

化学共沉淀-共还原法制备Fe70Ni27Co3触媒粉末及金刚石合成实验研究

本文介绍了利用化学共沉淀-共还原法制备Fe70Ni27Co3触媒粉末,研究了pH值、金属离子浓度、加料速度、添加剂用量对沉淀物产生和粒度的影响,确定出工艺条件为:pH值为3左右,沉淀物煅烧为450℃×3h,氢气还原工艺为650℃×3h;得到了D50约为9μm,氧含量为0.418%,铁、镍、钴的质量比为68.9∶26.5∶3.57的触媒粉末;进行了金刚石合成实验并与使用气雾化触媒粉末合成效果进行了对比。     

全氯型Pt-Re/γ-Al_2O_3重整催化剂氯含量的控制

本文探讨了全氯型Pt-Re/γ-Al_2O_3催化剂在工业装置运转、再生和氯化更新等过程中氯含量的控制问题.     

智能家居的“春天”来了

论述了智能家居的概念,着重阐述了智能家居及其核心技术的国内外发展历程,理清了智能家居的发展脉络。随后从技术、生产厂家、市场规模、消费者意识等方面论证了智能家居的“春天”已经来临。最后,对智能家居的未来发展进行了展望。     

Influence of process parameters on thermal-rate treatment of ZA42 alloy

Sand casting process and directional solidification technique combining thermal-rate treatment(TRT) were used. The influence of process parameters on TRT was investigated according to the values of impact toughness. At the same time, the mechanism of TRT was discussed. The results showed that TRT can improve the impact toughness of this alloy, while the hardness is basically constant. The time of heat preservation should not be more than 5min. Different forms of cooling intensification additive have different effects among which the zinc ingot solidified in graphite mold is the best one that can improve impact toughness of samples by more than 80%. With increasing the cooling temperature, the value of α(Al) crystal lattice constant increases. The element Sb has negative effect on TRT.     

Structures of bulk amorphous Zr41Til4Nil0Cul2.5Be22.5 alloy in amorphous, crystalline, supercooled liquid and liquid states

The amorphous and crystal structures of Zr41Til4Nil0Cul2.5 Be22.5 alloy have been analyzed with X-ray dif[ractometer. The structures of bulk amorphous Zr41Til4 Nil0Cul2.5B22.5 alloy in solid, supercooled liquid and liquid states are almost of the same structure. The RDFs (Radius Distribution Function), the first coordination number, the first coordination radius, the correlation radius and atom number of the cluster were calculated for bulk amorphous Zr41Til4Nil0Cul2.5B22.5 alloy in different states. The first coordination sphere radii and the first coordination numbers are 0.312nm, 11.2 in solid state, 0.301 nm, 10.932 in supercooled liquid region and 0.305nm, 11.296 in liquid state.The crystal structure of Zr41Til4Nil0Cu12.5B22.5 alloy is consisted of several intermetallic compounds which are CuZr2,Be2Zr, etc. The reason of formation glass for this alloy is that there is a larger resistance for atoms to rearrange and form intermetallic comnounds in a long range order.     

关于低碳沸腾钢锰制度与快速上注的探讨

本文粗浅地探讨了锰在低碳沸腾钢凝固过程中对 CO 气体析出与钢锭结构形成的影响及其机理。Mn 是弱脱氧剂,不控制钢液中〔O〕含量,但在凝固过程中起着脱氧作用,对 CO 气体析出、钢锭结构形成有着极为重要的影响。研究沸腾钢凝固现象应该以 Fe-C-Mn-O 四元系为依据,建立 C-Mn-O 平衡关系,充分注意 Mn 的影响与作用。Mn 对铜锭外侧坚壳带的形成及其厚度有着决定性的影响。降低〔Mn〕含量,则可增加 C-O 反应的〔O〕量,使由〔C〕控制的沸腾带深度 h_C增加,由〔Mn〕控制的脱氧带深度 h_(Mn)降低,铜液在模内沸腾作用强烈。结果是钢锭上半部管状气泡不发生带高度 h_0增加,坚壳带厚度 D_S 增厚,可以得到健全的沸腾钢锭,并为实行快速上注创造条件。对超低碳沸腾钢(C≤0.07%)采用高〔C〕低〔Mn〕化方法生产,可有效地防止针状气泡的发生,改善表面质量。     

Microstructural Characterization of Novel Ni-Containing Nd-Fe-B Strips by Strip Casting

The characteristics of novel Nd-Fe （Ni, Co, Al ）-B microstructure prepared by strip casting technique were studied. The novel microstructure was observed using scanning electron microscope （SEM） and transmission electron microscope （TEM）. Along the direction of heat flow, there are two kinds of different microstructures. Close to the wheel side, there is a thick layer containing many polygonal Nd2Fe14B grains. Near the free surface side, however, there are relative uniform platelike Nd2Fe14B grains whose growth direction is not completely the direction of the heat flow during solidification. The formation of the novel microstructure is presumed to be the contribution of the special temperature field and Ni component.