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The experimental results show that microwave sintering promotes the densification of green compacts with higher heating rate and reduced sintering cycle. The sintered relative density of 99.8% can be achieved during microwave processing under appropriate conditions. In addition, microwave sintering improves the uniformity and homogenization of W grain size, and yet leads to growth of W grain. Fe sintering aid degrades the microstructure uniformity and further coarsens W grains. The present investigation demonstrates the feasibility of applying microwave sintering technique to consolidate W-Cu composites and its promising outlook in reducing production cycle and cost.

结果表明:微波烧结升温速度快,周期短,能促进W-Cu材料的致密化;在适当条件下,微波烧结能获得相对密度达99.8%的W-Cu样品;微波烧结能改善W-Cu样品中两相分布的均匀性和W晶粒尺寸的一致性,但引起W晶粒的快速长大;Fe烧结助剂导致W-Cu材料显微组织均匀性变差,并引起晶粒进一步粗化;微波烧结技术能够应用于W-Cu材料的制备,在缩短生产周期、降低生产成本方面具有潜在优势。

The structure and configuration did not devastated while the hematite hollow particles were deoxidizing to iron hollow particles at 500℃ in hydrogen.

壳层厚度太厚、过快和过慢的升温速率都不利于得到空心结构;500℃氢气气氛还原不改变空心粒子的形貌;空心粒子的粒径取决于聚合物模板粒子的大小,壳层厚度取决于包裹层厚度;空心铁粒子的饱和磁化强度高达到95.26 emu/g,具有较好的抗氧化能力,其磁能积可增大到1.46×103 J/m3,有利于以磁损耗为主要吸波机制的铁磁性空心粒子在吸波材料领域的应用。

The retorting process of coals using hot char as solid heat carrier lines up every single process which is needed for the production of CMS.

以灵武煤半焦GLW-72为原料,粉碎至粒度<160目,混入40wt%的亚硫酸盐纸浆废液成型,将成型物在N〓气保护下,以10℃/min的升温速率加热到900℃碳化45min,冷却到室温所得碳化产品用于变压吸附空分,可获得含N〓96.3vol%的富N〓气体;将上述产品进一步作碳沉积处理,可获得空分性能达98.4vol%的炭分子筛,该结果与在同一空分装置上测得的国外炭分子筛的空分性能(98.23vol%)相当。

Through the comparative analysis of the earth pressure calculated by the different calculation methods, it is known that when the earth pressure behind the abutment of the integral abutment bridge under the action of rising temperatures is calculated, it is not proper to use the m method to calculate the resistance coefficients of the abutment back wall and column earth while the resistance coefficient of the abutment back wall earth can be calculated by the Broms method. It is proper that the resistance coefficients of the earth of the abutment and pier piles should be considered by the p-y curve.

通过对不同方法计算的台后土压力的对比分析,得知:在计算升温引起的整体式桥台桥梁台后土压力时,桥台背墙及台柱土的水平抗力系数计算采用m法是不适合的;桥台背墙后填土的水平抗力系数可采用Broms法计算;土对台桩及墩桩侧的水平抗力系数按p-y曲线来考虑是适合的。

The process includes the following steps: dissolving bromine in halogenated hydrocarbon, dropping the bromine solution into reactant system comprising pentabromo toluene, halogenated hydrocarbon, free radical initiator and hydrogen peroxide at 50-65 deg.c, and heating to 60-78 deg.c for reflux reaction until the reactant system becomes transparent; filtering the resultant to obtain solid product, washing with carbon tetrachloride and water separately and vacuum drying to obtain pentabromo benzyl bromide.

具体步骤为:将五溴甲苯、卤代烃、自由基引发剂和过氧化氢组成的反应体系加入到三颈瓶中,将0.07~0.1mol的溴溶于50ml卤代烃配成溶液,在50-65℃温度下滴加到反应体系中,滴加时间为50-70分钟,然后升温至60-78℃温度下回流反应,至反应体系逐渐变透明,且不再产生气泡时,将所得产物过滤,得到固体产物,分别用CCl 4 和水洗涤,真空干燥,即得到五溴苄基溴;其中,五溴甲苯与溴的摩尔比为1∶0.7-1∶1.0,溴与过氧化氢的摩尔比为1∶1.0-1∶1.4,自由基引发剂加入量为五溴甲苯重量的1-10%,卤代烃的加入量为反应体系体积的40%-100%,所用溶剂可以直接进行下一批反应,不需要更换溶剂或蒸馏提纯。

Its high-capacity and strong-acid-resistance were proved. In the acid condition, the adsorption efficiency to acide green 6B and direct fast yellow RL reached above 90%. Through the adsorption rate curve on adsorption behavior of the three dyes, they were all according with pseudo-secondary adsorption rate curve. The rate constant of adsorption increased with increasing temperature. Through the adsorption isotherm of the three dyes, acide green 6B and direct fast yellow RL were according with Langmuir equation, while disperse blue 56 was according with Freundlich equation. The adsorption behavior was an endothermic process. Entropy was increasing during the adsorption. So raising temperature was in favor of adsorption.

结果表明,甲醛环氧氯丙烷交联壳聚糖对染料具有较强的吸附性能和耐酸性能,在酸性条件下,对酸性绿6B和直接耐晒黄RL的吸附效率达90%以上;拟合甲醛环氧氯丙烷交联壳聚糖对三种染料的吸附速率曲线,发现该吸附行为符合拟二级吸附速率曲线,其吸附速率常数随温度的升高而增大;通过测定不同温度下甲醛环氧氯丙烷交联壳聚糖吸附三种染料的吸附等温线表明,甲醛环氧氯丙烷交联壳聚糖对酸性绿6B和直接耐晒黄RL的吸附符合Langmuir方程,而对分散蓝56的吸附符合Freundlich方程,甲醛环氧氯丙烷交联壳聚糖对染料的吸附是一个吸热过程,吸附后体系熵增加,升温有利于吸附。

In this paper, The influence of heat set and dyeing on the structure of PTT fiber was investigated by FT-IR, DSC, critical dissolution time. The influence of heat set on the dyeability of PTT fiber was discussed, too. Meanwhile, many experiments on the dyeing performance of PET fiber were carried out. The effect of different dyeing temperature on the uptake and visual color depth value and dyeing characteristics of different dyes with temperature increasing were discussed, and the influence of temperature on the dyeing depth were also evaluated when dyeing for PTT and PET fiber in the same dye bath condition. Especially the kinetics and thermodynamics of dyeing with disperse dyes were mainly studied.

目前,我国对PTT染色性能方面研究报道还少,本文用傅立叶红外光谱、差热分析、临界溶解时间等分析方法研究了热定型和染色对PTT纤维结构的影响,探讨了热定型对PTT纤维可染性的影响,同时进行了多项PTT纤维的基本染色性能试验,探讨了不同染色温度对上染百分率及表观色深值的影响、不同染料的升温上染特性、不同染料的移染性能和染深性能以及PTT和PET纤维同浴染色时染色温度对它们的染色深度的影响。

But along with the social economy development, the vegetables consumption quantity is daily increased, the great scale of the greenhouse vegetables production is higher and higher day after day and a special reason is benefit actuation. It emerges one batch of vegetables types relatively sole specialized production base one after another, which causes the original cropping system to disintegrate objectively, the farmer who is engaged to run some specific vegetables production is increased day by day, the vegetables type are restricted frequently by the high production and economic efficiency fruit vegetables, the tendency of specialized production is suddenly revealed day after day, finally is causes the soil environment to worsen, the vegetables plant disease to be serious, the output to reduce, the quality and the series barrier of continuous copings to occur and the facility vegetables production further development to be cut down.

但随着社会经济的发展,蔬菜消费量的日益增加,温室蔬菜规模化生产日渐升温,加上效益驱动等原因,相继涌现出一批蔬菜种类相对单一的专业生产基地,客观上导致原有耕作制度瓦解,从事某一特定蔬菜生产的农民日益增多,蔬菜种类常常局限于生产经济效益高的果菜类,专业化生产趋势日渐突显,结果导致土壤环境恶化、蔬菜病虫害严重、产量降低、品质下降等一系列连作障碍的发生,严重威胁着设施蔬菜生产的进一步发展。

Fitting curves are in good agreement with the experimental results,the calculated kinetic parameters are in good agreement with those reported in term of modeling of the pyrolysis of the three components assuming hemicellulose,cellulose and lignin pyrolyzing independently and para...

采用非线性最小平方算法,按三组分独立平行一级反应热解动力学模型,模拟计算的曲线与实验结果吻合较好,求解的动力学参数与文献报道值吻合较好,且随着升温速率的加快,纤维素和木质素热解的活化能有增加的趋势,而半纤维素活化能有下降的趋势。

This computer control system can control the accuracy of the warming pan sterilization, thermal insulation, packing, cooling, and can show that the sterilization process and detailed record of temperature, T-t curve, according to different product design store more than 100 Sterilization process, in accordance with user requirements and design of the hot pan detection distribution of food sterilization process of analysis, providing a favourable scientific basis.

此电脑控制系统,能准确无误的控制杀菌锅的升温、保温、保压、冷却,并能显示出整个杀菌的过程和详细记录温度、T-t曲线图,能够根据不同产品设计贮存100多个杀菌工艺,并可根据用户要求设计检测锅内的热分布,对食品杀菌过程的分析,提供有利的科学依据。

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Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气,收缩臀部肌肉;拱起身体,尽量抬起头来,右腿伸直朝向天花板(膝微屈,以避免肌肉紧张)。

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