| 2 | 熔融Al−Cr−V−B合金中CrB_(2)和VB_(2)形成的热力学和动力学分析显示文摘熔体中的铬(Cr)、钒(V)等过渡金属杂质会降低冶炼级铝(Al)的电导率。这些杂质可与含硼(B)物质发生原位反应形成硼化物,因此可以通过硼处理除去熔体中的杂质。然而,对于冶炼级铝熔体的除铬尚不清楚。文献中关于在其他过渡金属(V,Ti,Zr,Fe)存在的条件下,往熔融铝中加入Al−B母合金时硼化铬(CrB_(2))的形成存在分歧。本研究在1023 K下往铝合金熔体中加入Al−B(AlB_(12))母合金,探讨Al−0.50%Cr−0.50%V(质量分数)合金除铬的机理。结果表明,在1023 K下,无法通过形成稳定的硼化物从熔融的Al−0.50%Cr−0.50%V合金中除铬。在熔融铝的硼处理过程中,熔体中过量的B优先形成硼化铝(AlB_(2)),而不是CrB_(2)。从熔融Al−0.50%Cr−0.50%V合金中除钒的动力学研究表明,初期反应阶段由[B]/[V]的液相传质控制,传质系数(km)为9.6×10^(-4) m/s;后期反应阶段受[B]/[V]通过硼化物(VB2)环的扩散控制。因此,建议研究从熔融铝中除铬的替代方法。 | A.KHALIQ H.T.ALI M.YUSUF | 2021 | Transactions of Nonferrous Metals Society of China2021，31，10： | 1 |
| 3 | Effect of Plant Growth-Promoting Rhizobacteria on Growth,Nodulation and Nutrient Accumulation of Lentil Under Controlled Conditions显示文摘Application of plant growth-promoting rhizobacteria (PGPR) has been shown to increase legume growth and development under field and controlled environmental conditions. The present study was conducted to isolate plant growth-promoting rhizobacteria (PGPR) from the root nodules of lentil (Lens culinaris Medik.) grown in arid/semi-arid region of Punjab, Pakistan and examined their plant growth-promoting abilities. Five bacterial isolates were isolated, screened in vitro for plant growth-promoting (PGP) characteristics and their effects on the growth of lentil were assessed under in vitro, hydroponic and greenhouse (pot experiment) conditions. All the isolates were Gram negative, rod-shaped and circular in form and exhibited the plant growth-promoting attributes of phosphate solubilization and auxin (indole acetic acid, IAA) production. The IAA production capacity ranged in 0.5-11.0 μg mL-1 and P solubilization ranged in 3-16 mg L-1 . When tested for their effects on plant growth, the isolated strains had a stimulatory effect on growth, nodulation and nitrogen (N) and phosphorus (P) uptake in plants on nutrient-deficient soil. In the greenhouse pot experiment, application of PGPR significantly increased shoot length, fresh weight and dry weight by 65%, 43% and 63% and the increases in root length, fresh weight and dry weight were 74%, 54% and 92%, respectively, as compared with the uninoculated control. The relative increases in growth characteristics under in vitro and hydroponic conditions were even higher. PGPR also increased the number of pods per plant, 1 000-grain weight, dry matter yield and grain yield by 50%, 13%, 28% and 29%, respectively, over the control. The number of nodules and nodule dry mass increased by 170% and 136%, respectively. After inoculation with effective bacterial strains, the shoot, root and seed N and P contents increased, thereby increasing both N and P uptake in plants. The root elongation showed a positive correlation (R2 = 0.67) with the IAA production and seed yield exhibited a positive correlation (R2 = 0.82) with root nodulation. These indicated that the isolated PGPR rhizobial strains can be best utilized as potential agents or biofertilizers for stimulating the growth and nutrient accumulation of lentil. | M.ZAFAR M.K.ABBASI M.A.KHAN A.KHALIQ T.SULTAN M.ASLAM | 2012 | Pedosphere2012，22，6： | 1 |
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