浅析超细高活性锌粉的制备和用途

通过对超细高活性锌粉的用途和制备方法的论述 。

高活性微硅粉对水稻产量的影响

以宁粳50号为研究对象,设计了0、90kg/hm^(2)、180kg/hm^(2)和270kg/hm^(2)4种不同施硅肥用量处理,研究硅肥对水稻生长发育、光合特性及产量的影响。结果表明:施用180kg/hm^(2)高活性微硅粉可显著提高水稻的光合特性及产量,与CK相比,净光合速率、气孔导度、胞间CO_(2)浓度、蒸腾速率分别增加43.73%、7.8%、10.1%、38.94%。在施用180kg/hm^(2)的高活性微硅粉处理下,水稻的产量增加,品质得到改善,效果最佳。因此,合理适量施用硅肥可有效提高水稻的光合特性,促进水稻增产,具有较高的推广应用价值。

改性粉煤灰脱硫剂增湿脱硫工艺

研究利用开发的改性粉煤灰脱硫剂,通过模拟试验装置,采用干喷增湿的方法进行正交试验,根据正交试验得出影响脱硫效率的因素及作用大小,并进行了单因素分析和讨论。

不同水泥取代率下喷射混凝土的抗压性能研究

本文以广西平昭高速狮子山隧道为依托工程,创新研发纳米晶胶聚合物-高活性岩粉用于隧道喷射混凝土中,探究新型喷射混凝土的工作性能及抗压力学性能,并通过离散元数值模拟进行细观分析。研究提出,在30%水泥用量取代率下,纳米晶胶聚合物-高活性岩粉能够较好地提升喷射混凝土的早期强度,而在25%水泥用量取代率下的纳米晶胶聚合物-高活性岩粉对于喷射混凝土的后期强度能够发挥较好保障作用,纳米晶胶聚合物-高活性岩粉的联合作用能够在喷射混凝土中发挥较好的抗压性能及碳减排优势。

Preparation and characterization of amorphous boron powder with high activity

The amorphous boron powders with high activity were prepared by the high-energy ball milling-combustion synthesis method. The effects of the milling rate and milling time on the crystallinity, microscopic morphology and reactivity of amorphous boron powder were studied. The results show that the crystallinity of amorphous nano-boron powder is only 22.5%, and its purity reaches 92.86%. The high-energy ball milling can significantly refine boron powder particle sizes, whose average particle sizes are smaller than 50 nm, and specific surface areas are of up to 70.03 m2/g. When the transmission electron beam irradiates the samples, they rapidly melt. It can be seen that the monomer amorphous boron size is less than 30 nm from the specimen melting traces, which indicates that the samples have high reactivity.

钨和钨合金真空固态压力扩散连接

以高纯铁粉为中间层,采用真空扩散连接实现纯W与W-60Fe合金材料的高强度连接,研究了连接工艺对元素扩散、连接性能和中间层组织、断口组织的影响。结果表明:连接界面发生梯度扩散并产生冶金结合,随扩散温度升高,W、Fe扩散距离呈抛物线性正增长;随扩散时间延长、施加压力增大,扩散距离都显著增大;且在W/Fe界面和(W-60Fe)/Fe界面,W在Fe中的扩散距离要大于Fe在W中的扩散距离。在温度850℃、压力50 MPa、保温时间2 h条件下,中间层组织最为致密,界面连接强度最高为182 MPa。在此工艺水平下,继续升高连接温度、延长保温时间和增大保压压力,都会使连接界面晶粒粗化,从而使界面连接强度出现降低。连接界面强度超过母材钨的强度,连接样品拉伸断裂主要发生在W的部分。

The difference of soluble sugar contents and starch synthetic key enzyme activities between high and low starch cultivar of cassava

The difference of soluble sugar contents and starch synthetic key enzyme activities between high starch cultivar and low starch cultivar were studied in this experiment, of which FuXuan01, GR891, SC124, and SC201 were used as materials. The results showed that the contents of reducing sugar in root tube of low starch cultivars were higher than those of high starch cultivars in all growth periods, the contents of sucrose in root tube of high starch cultivar were higher than those of low starch cultivars in the early growth period, but, lower in the late growth period, and there were almost no difference in the contents of soluble sugar in root tube between high starch cultivar and low starch cultivar in the early growth period, but notable difference in the late growth period and the soluble sugar contents of low starch cultivars were higher than those of high starch cultivars. It also-showed that the activities of ADPGPpase, SSS, and SBE （starch branching enzyme） of high starch cultivars were higher than those of low starch cultivars. It was evident that there were close correlations between the content of sucrose, reducing sugar and soluble sugar in root tube, and the activities of ADPGPpase, SSS, SBE, and the starch accumulation in the root tubers of cassava. It was quite evident in this experiment that the soluble sugar and starch synthetic key enzyme were main factors controlling starch accumulation in root tubers. These results provided important indication for physiological controlling in high starch cultivation and gene engineering breeding of high starch cultivar of cassava.

Reduction of Patulin Content in Apple Juice Using Activated Carbone

The mycotoxin, patulin （4-hydroxy-4H-furo [3, 2c] pyran-2 [6H]-one）, is produced by a number of fungi common to fruit and vegetable-based products, most notably apples. Patulin contamination within apple products poses a serious health risk to consumers. Studies done on laboratory animals have demonstrated that patulin has a broad spectrum of toxicity, including mutagen city and carcinogenicity. The aim of the experiment was studying influence of selectively acting activated carbon powder--Ercarbon SH （Erbsloh, Germany） which is special produced for lowering HMF （hydroxy methyl furfural）, on reduction of patulin content in clear apple juice. Industrial apple row material with some damaged parts was pressed, juice was pasteurized at 95 ℃ during 2 min. After cooling on 55 ℃, enzymatic treated and clarified juice were filtered by 0.45 [am pore sizes membrane filter, Apple clear juice sample was divided for five parts. The samples of apple juice were diluted to 11.5° Brix and contacted with concentrations of 2, 2.5, 3 and 3.5 g/L activated carbon powder for 30 min. After filtration in the experimental samples, putulin was quantitatively determined by HPLC （high performance liquid chromatography with UV） detector at 276 nm. The research revealed that the best results were achieved by treatment with activated carbon in its powder form at concentration of 2.5 g/L with 30 min contact time.

An investigation on micro pore structures and the vapor pressure mechanism of explosive spalling of RPC exposed to high temperature

Reactive powder concrete （RPC） is vulnerable to explosive spalling when exposed to high temperature. The characteristics of micro pore structure and vapor pressure of RPC are closely related to the thermal spalling. Applying mercury intrusion po- rosimetry （MIP） and scanning electron microscopy （SEM） techniques, the authors probed the characteristics of micro pore structures of plain RPC200 when heated from 20-350~C. The pore characteristics such as specific pore volume, threshold pore size and most probable pore size varying with temperatures were investigated. A vapor pressure kit was developed to measure the vapor pressure and its variation inside RPC200 at various temperatures. A thin-wall spherical pore model was proposed to ana- lyze the thermo-mechanical mechanism of spalling, by which the stresses varying with the vapor pressure q（T） and the character- istic size of wall （K） at any point of interest were determined. It is shown that the pore characteristics including specific pore volume, average pore size, threshold pore size and most probable pore size rise significantly with the increasing temperature. 200~C appears to be the threshold temperature above which the threshold pore size and the most probable pore size climb up dramatically. The increase in the specific pore volume results from the growth both in quantity and in volume of the transition pores and the capillary pores. The appearance of the explosive spalling in RPC200 is mainly attributed to being unable to form pathways in favor of releasing water steam in RPC and to thin-wall sphere domain where the vapor pressure governs the the rapid accumulation of high vapor pressures as well. The spalling is bounded through the pore model.