中国钼业难忘的2004

重点论述了近5年特别是2004年我国钼产量与钼外贸发展情况，包括钼精矿产量变化、钼及其制品进出口态势和钼品出口创汇在全国有色金属和铁合金出口创汇所处的位置。     

金堆城百花岭选矿厂钼浮选金属走向查定及分析

考查了金堆城百花岭选矿厂钼、硫、铜、铅在选钼流程中的走向与分布，提出了进一步优化工艺的措施和降低钼精矿铜、铅等杂质的方法。     

钼在α铁基体中的平衡固溶度公式

根据相关热力学数据推导出μ相（Fe7Mo6）和λ相（Fe2Mo）在α铁中的固溶度积公式，同时考虑Fe7Mo6 和Fe2Mo的形成自由能随温度的变化关系式，推导出在不同温度范围钼在α铁基体中的平衡固溶度公式分别为：log（[Mo]α） =3.003-1961/T（899～1199 ℃）; log（[Mo]α）=2.752-1562/T（311.6～899 ℃）.这些公式在相关的理论研究和生产实际应用中具有重要的作用.     

砼薄壁筒体在现浇钢筋混凝土空心板中的应用与施工

阐述了BDF薄壁管在现浇钢筋混凝土空心极中的应用,介绍了其工艺原理、技术特点、计算原理、优越性等几个方面的内容,并对其施工技术进行了论述。     

钢筋混凝土双向叠合板抗剪强度的极限分析

通过对８块无结合筋双向叠合板的试验研究，本文采用组合周界错动机构，锥面母线为直线与曲线的连线，按塑性极限分析的方法推导了抗剪强度计算公式。该公式与试验结果符合性良好。     

金堆城钼细泥过滤脱水应用研究

对在“57钼精矿”生产过程中产生的用常规过滤无法进行脱水的钼细泥，用TT系列陶瓷过滤机进行脱水研究。完全解决了钼细泥的脱水问题。保证了“57钼精矿”生产工艺的畅通。     

2003年钼市场回顾与2004年展望

回顾了2003年世界钼市场的供需状况和价格走势，并对2004年钼市场前景进行了展望。     

2004年钼业年评

评述了2004年世界钼的供给、消费和价格，特别是叙述了钼的新产品、新技术，如矿冶、黑色合金、有色合金、超级合金、钼粉、催化剂、润滑剂、缓蚀剂、阻燃抑烟剂和抗菌剂等的研究与开发进展。     

适时调整矿山生产计划以适应钼价格波动

不同的经济技术条件确定不同的开采境界。钼价格的波动对钼矿山的生产影响非常大。作为企业就要以市场为先导，根据变动的钼价格确定短期开采境界，及时对矿山生产做出调整，以使企业的经济效益最佳。     

Wheel Load Distribution in Simply Supported Concrete Slab Bridges

This paper presents the results of a parametric study related to the wheel load distribution in one-span, simply supported, multilane, reinforced concrete slab bridges. The finite-element method was used to investigate the effect of span length, slab width with and without shoulders, and wheel load conditions on typical bridges. A total of 112 highway bridge case studies were analyzed. It was assumed that the bridges were stand-alone structures carrying one-way traffic. The finite-element analysis (FEA) results of one-, two-, three-, and four-lane bridges are presented in combination with four typical span lengths. Bridges were loaded with highway design truck HS20 placed at critical locations in the longitudinal direction of each lane. Two possible transverse truck positions were considered: (1) Centered loading condition where design trucks are assumed to be traveling in the center of each lane; and (2) edge loading condition where the design trucks are placed close to one edge of the slab with the absolute minimum spacing between adjacent trucks. FEA results for bridges subjected to edge loading showed that the AASHTO standard specifications procedure overestimates the bending moment by 30% for one lane and a span length less than 7.5 m (25 ft) but agrees with FEA bending moments for longer spans. The AASHTO bending moment gave results similar to those of the FEA when considering two or more lanes and a span length less than 10.5 m (35 ft). However, as the span length increases, AASHTO underestimates the FEA bending moment by 15 to 30%. It was shown that the presence of shoulders on both sides of the bridge increases the load-carrying capacity of the bridge due to the increase in slab width. An extreme loading scenario was created by introducing a disabled truck near the edge in addition to design trucks in other lanes placed as close as possible to the disabled truck. For this extreme loading condition, AASHTO procedure gave similar results to the FEA longitudinal bending moments for spans up to 7.5 m (25 ft) and underestimated the FEA (20 to 40%) for spans between 9 and 16.5 m (30 and 55 ft), regardless of the number of lanes. The new AASHTO load and resistance factor design (LRFD) bridge design specifications overestimate the bending moments for normal traffic on bridges. However, LRFD procedure gives results similar to those of the FEA edge+truck loading condition. Furthermore, the FEA results showed that edge beams must be considered in multilane slab bridges with a span length ranging between 6 and 16.5 m (20 and 55 ft). This paper will assist bridge engineers in performing realistic designs of simply supported, multilane, reinforced concrete slab bridges as well as evaluating the load-carrying capacity of existing highway bridges.