低温溶液育晶微机多路控制系统

文章详细叙述了整个系统的硬件结构和功能,给出了全部软件流程图,并扼要介绍其设计思想,最后给出运行测量结果。

Ⅳ效蒸发过程中并入Ⅰ效逆循环OSLO育晶器生产粗粒盐有关技术问题初探

本文介绍了Ⅳ效真空蒸发过程中并入道循环ＯＳＬＯ育晶器生产粗粒盐工艺，设备及有关技术要求，通过生产试验和技术改造，确定了各项工艺参数指标，为逆循环ＯＳＬＯ带育晶器工业化生产粗粒盐设计提供了可靠的依据。

味精的起晶新方法

味精的起晶新方法赵茜，于淑娟，高大维（华南理工大学轻化工研究所，广州，５１０６４１）在工业生产中，使溶液产生晶核，就叫起晶，也称成核，起晶的方法有下列三种［１］，即自然起晶法、刺激起晶法以及晶种起晶法。现在味精生产中晶种的制备是单独做大结晶［２］，经...

Grain refinement of pure aluminum by direct current pulsed magnetic field and inoculation

The combined effects of direct current pulsed magnetic field （DC-PMF） and inoculation on pure aluminum were investigated, the grain refinement behavior of DC-PMF and inoculation was discussed. The experimental results indicate that the solidification micro structure of pure aluminum can be greatly refined under DC-PMF. Refinement of pure aluminum is attributed to electromagnetic undercooling and forced convection caused by DC-PMF. With single DC-PMF, the grain size in the equiaxed zone is uneven. However, under DC-PMF, by adding 0.05% （mass fraction） Al5Ti-B, the grain size of the sample is smaller, and the size distribution is more uniform than that of single DC-PMF. Furthermore, under the combination of DC-PMF and inoculation, with the increase of output current, the grain size is further reduced. When the output current increases to 100 A, the average grain size can decrease to 113 μn.

Breeding of a New Fine Quality Fragrant Hybrid Rice Combination Taoxiangyoulijing

Taoxiangyoulijing is a new fine quality fragrant hybrid combination bred by matching the fine quality indica sterile line Taoxiang A with the fine quality restorer line R Lijing by Hunan Taohuayuan Agricultural Science and Technology Co.Ltd,Changsha Zhulixiang Agricultural Science and Technology Co.Ltd and Hunan Zhihe Seed Technology Co.,Ltd.The combination is featured with wide adaptability,high yield,strong resistance to rice blast,and GB class 2 high quality.In October 2019,Taoxiangyoulijing was approved by the National Crop Variety Certification Committee and it reached the second class standard of quality score according to the Standard for Fine Quality Rice,Ministry of Agriculture,China.

Effects of melt treatment temperature and isothermal holding parameter on water-quenched microstructures of A356 aluminum alloy semisolid slurry

The semisolid slurry of the A356 aluminum alloy was prepared by self-inoculation method(SIM),the effects of melt treatment temperatures and isothermal holding parameters on water-quenched microstructures of A356 aluminum alloy semisolid slurry were investigated,and the solidification behavior of the remaining liquid phase(secondary solidification)was analyzed.The results indicate that the melt treatment temperature has significant effects on the final semisolid microstructures.The semisolid slurry which is suitable for the rheological forming can be produced when the melt treatment temperature is between 680 and 690°C.During the isothermal holding process,the growth rate of the primary particles conforms to the dynamic equation of Dt 3-Do3=Kt,and the coarsening rate of the primary particles is the fastest when the isothermal holding temperature is 600°C.Additionally,the isothermal holding time also has obvious effect on the secondary solidification microstructures.The secondary particles are the smallest and roundest when the isothermal holding time is 3 min.The amount of the secondary particles gradually increases with the increase of isothermal holding temperature,and the eutectic reaction therefore is confined into small intergranular areas,contributing to the compactness of the final solidified eutectic structures.

Assessment of solidification characteristics of carbon-inoculated Mg-3%Al melt by thermal analysis

The Mg-3%Al melt was inoculated by carbon with different holding time.The effect of holding time on grain refining efficiency was evaluated.The solidification characteristics of the carbon-inoculated Mg-3%Al melt with different holding time were assessed by computer-aided cooling curve analysis.The results showed that Mg-3%Al alloy could be effectively refined by carbon inoculation.Slight fading phenomenon occurred with increasing the holding time to 60 min.Carbon inoculation could significantly influence the shape of cooling curves of Mg-3%Al melt.The nucleation starting and minimum temperatures increased.The recalescence undercooling and duration decreased to almost zero after carbon inoculation.The grain refining efficiency of carbon inoculation could be assessed by the shape of the cooling curve and solidification characteristic parameters including nucleation starting and minimum temperatures,recalescence undercooling and duration.

Crystal structure of a plant leucine rich repeat protein with two island domains

Leucine rich repeat(LRR)domain,characterized by a repetitive sequence pattern rich in leucine residues,is a universal protein-protein interaction motif present in all life forms.LRR repeats interrupted by sequences of 30 70 residues(termed island domain,ID)have been found in some plant LRR receptor-like kinases(RLKs)and animal Toll-like receptors(TLR7-9).Recent studies provide insight into how a single ID is structurally integrated into an LRR protein.However,structural information on an LRR protein with two IDs is lacking.The receptor-like protein kinase 2(RPK2)is an LRR-RLK and has important roles in controlling plant growth and development by perception and transduction of hormone signal.Here we present the crystal structure of the extracellular LRR domain of RPK2(RPK2-LRR)containing two IDs from Arabidopsis.The structure reveals that both of the IDs are helical and located at the central region of the single RPK2-LRR solenoid.One of them binds to the inner surface of the solenoid,whereas the other one mainly interacts with the lateral side.Unexpectedly,a long loop immediately following the N-terminal capping domain of RPK2-LRR is presented toward and sandwiched between the two IDs,further stabilizing their embedding to the LRR solenoid.A potential ligand binding site formed by the two IDs and the solenoid is located at the C-terminal side of RPK2-LRR.The structural information of RPK2-LRR broadens our understanding toward the large family of LRR proteins and provides insight into RPK2-mediated signaling.

Growth and morphological characterization of zinc nanoplates

Zinc nanoplates were grown using thermal evaporation without catalyst or template involved.Tunneling electron microscopy and selected area electron diffraction analyses showed that the plates were single crystals with either {0001} or {11 20} as basal surfaces.The morphological characteristics were explained in terms of the intrinsic growth anisotropy of zinc,the surface energy of the nano-crystals,the size of the critical nucleus and the migration of the adatoms.Our results suggested a promising low-cost route for synthesis of pure zinc nanoplates which could be used as precursor for further preparing core-shell nanoplate structures.