低品位细脉型黑白钨矿合理选矿工艺研究

依据矿石的工艺矿物学研究,对低品位细脉型黑、白钨矿石提出了粗粒重选—细粒浮选的工艺,在原矿含WO30.23%、Mo0.018%的情况下,获得了重选钨精矿含钨WO363.54%、钨回收率70.11%,细泥浮选钨精矿含钨WO335.22%、钨回收率10.48%,综合钨精矿含钨WO357.53%、钨回收率80.59%,钼粗精矿含钼2.31%、钼回收率50.54%的结果,钨和钼得到了有效回收。     

Stochastic structural model of rock and soil aggregates by continuum-based discrete element method

Ancient slope[1], debris-flow deposit[2] and rock-filling dam[3] are usually made of rock and soil aggregates (RSA). The RSA is a typical inhomogeneous and discontinuous medium, and its main characteristics include: (i) loose piling up by blocks or particles, (ii) mixing of different blocks with a range of shapes and sizes, (iii) stochastic distribu- tion of blocks in space, (4) fillings often in between blocks. The mechanical properties of these rock and soil aggregates are commonly obtaine…     

废卉混凝土再利用的研究进展

从节省能源和环境保护角度评述了利用废弃混凝土生产再生骨料混凝土的研究进展,并介绍了其在水泥和免烧等生产中再利用的最新研究动态。     

铸钢粗晶的成因及消除方法的研究

通过对ZG32Cr06铸钢粗晶成因的分析及消除粗晶的工艺性能试验，探讨了粗晶导致铸件断裂的机理。试验证明，由于浇铸温度过高，水爆清砂时开箱过早而产生的粗晶可以用热处理方法消除，同时提出了铸件在浇铸时防止粗晶的措施。     

高铬砖显微结构分析

利用扫描电镜及能谱仪对国产和进口Cr2O3-90砖的显微结构进行了观测与分析,结果表明两种砖虽组成接近,但结构和工艺存在明显差异,进口砖采用烧结氧化铬为骨料,且基质结构十分均匀致密;国产砖则采用电熔氧化铬为骨料,基质与骨料之间虽烧结紧密,但结构的均匀性和致密性均略逊于进口砖,再加上基质中较高的Al2O3含量以及骨料颗粒中多而长的裂隙,这些都将对国产砖的使用性能与寿命产生一定的不利影响。     

再生混凝土的环境评价

对再生混凝土的资源消耗、能量消耗和二氧化碳的排放量进行了量化分析，结果表明，利用再生粗骨料配制混凝土比完全使用天然集料配制的混凝土可节约62％的石灰石资源；利用废弃混凝土作制造水泥的原料与再生粗集料，可节省配制混凝土的62％石灰石资源，还可节省制造水泥的优质石灰石60％、粘土40％和铁粉35％的资源，同时，可减少20％C02的排放量。研究还表明，配制再生混凝土的能耗与配制普通混凝土的能耗相当。     

低能耗夯实粗粒土建筑特性的试验研究

夯土建筑古朴、自然、节能、生态且与环境协调。为我国传统民居建筑采用的主要形式之一，针对国内夯土建筑在设计、选材、施工方面仍为空白，本文通过大量试验，对夯土建筑所用的材料—粗粒土的性质进行了初探，可作为传统民居建筑设计的技术指标参考，并经今后深入研究逐步成为科学定量化的标准依据。     

The Permeability and Strength of Green High Performance Concrete

1　IntroductionHavinghighconstructioncapability ,highdurabilityandhighstrength ,greenhighperformanceconcrete (GH PC)isanewkindofconcrete ,whichisbenefitialtohu manbeingandcansaveenevgy .GHPCemphasizestheconcretedurabilityandstrength ,makingabestuseofgreenbuildingmaterialsduringpreparation .“Green”hasmeaningsinfollowingthreeaspects[1] :(1)savingenergyandloweringpollution ;makinguseofindustrialwasteres idueandotherresources ;(2 )predigestingmachiningtoreducetheenergyconsumptionusingindustri…     

Pid Performance Tuning Methods For A Robotic Manipulator Based On Iss

This paper proposes performance tuning methods for a PID controller for a robotic manipulator. The design procedures of an inverse optimal PID control method employed to assure extended disturbance input‐to‐state stability (ISS) are suggested. The performance tuning methods for an inverse optimal PID control are derived from the performance limitation and the bounds of the state vector. Also, the effects of proportional and integral gains are considered in evaluating the performance tuning. Finally, we show the validity of the performance tuning methods through the experiment on a robotic manipulator.     

Static Coarse Grain Task Scheduling with Cache Optimization Using OpenMP

Effective use of cache memory is getting more important with increasing gap between the processor speed and memory access speed. Also, use of multigrain parallelism is getting more important to improve effective performance beyond the limitation of loop iteration level parallelism. Considering these factors, this paper proposes a coarse grain task static scheduling scheme considering cache optimization. The proposed scheme schedules coarse grain tasks to threads so that shared data among coarse grain tasks can be passed via cache after task and data decomposition considering cache size at compile time. It is implemented on OSCAR Fortran multigrain parallelizing compiler and evaluated on Sun Ultra80 four-processor SMP workstation using Swim and Tomcatv from the SPEC fp 95. As the results, the proposed scheme gives us 4.56 times speedup for Swim and 2.37 times on 4 processors for Tomcatv respectively against the Sun Forte HPC Ver. 6 update 1 loop parallelizing compiler.