查询词典 reagents

The effects of equilibrium time,acidity of the solution,temperature,concentration of redox reagents on the adsorption of neptunium by silica gel were carried out.

进行了吸附平衡时间、酸度、温度、氧化还原剂浓度等条件对硝酸溶液中Np、Np和Np在硅胶上吸附的影响的实验，与吸附时同酸度条件下的洗脱实验，用浓度为3mol／L的硝酸作为解吸剂的解吸实验。

With technology's revolution by days, competition sharply growth in nowadays, we make endeavors on improving and renovating our technology in metal surface treatment and importing new product category. The same time ,to meet the environment and market growing demand, our room temperature nigrescence and degrease reagents meet ROHS standards, achieved SGS certification finally.

科技月新日异，市场竞争日益加剧，热士化工针对新技术的发展与一向为客户所重视的产品稳定性，不断致力于产品的技术革新及先进和高质之金属表面处理技术、产品的引进，同时为了响应环保及满足市场需求，热市化工产品钢铁常温发黑剂及脱水防锈油已经达到欧盟ROHS指令的要求，并通过了SGS公司的认证。

With technological innovation by days, competitiveness sharply growth in nowadays, we make endeavors on improving and renovating our technology in metal surface treatment and importing new product category. The same time ,to meet the environment and market growing demands, our room temperature nigrescence and degrease reagents meet ROHS standards requirements ,with SGS certification achieved finally.

科技月新日异，市场竞争日益加剧，热士化工针对新技术的发展与一向为客户所重视的产品稳定性，不断致力于产品的技术革新及先进和高质之金属表面处理技术、产品的引进，同时为了响应环保及满足市场需求，我们众多产品中的钢铁常温发黑剂及脱水防锈油产品已经达到欧盟ROHS指令的要求，并通过了SGS公司的认证。

The conclusions were as follows: theνO-H andνC=O IR absorption maxima shifted towards higher wave numbers after imprinting 17β-estradiol on TFMAA-co-TRIM copolymer with the red shift of theνO-H groups being apparent after precipitation polymerization for 16h while that forνC=O groups being observed after polymerization for 24h. A strong interaction between TFMAA and 17β-estradiol was confirmed by the high selectivity for 17β-estradiol, as indicted by the values of the separation factor of isomers of 17β-estradiol/17α-estradiol (2.28) and the imprinted factor (3.01). Particle diameter of TFMAA-co-TRIM polymer was between 300 nm and 1.5μm, which suited well for solid phase sorbent throughout at low column pressure. The recognition of imprinting TFMAA-co-TRIM polymer for sterol molecules was driven by enthalpy eluted with acetronitile, and low temperature was in favor of the separation of sterol structure analogues on imprinting column. TFMAA-co-TRIM polymer possessed of determinate anti-heat stability, with melting point beginning at 255.84℃, Tp=257.40℃, control TFMAA-co-TRIM polymer and imprinting TFMAA-co-TRIM polymer were respectively decompounded at 267.79℃and 343.11℃, and solid micro-extraction noddle prepared by the special polymerization also showed definite recognition for 17β-estradiol by GC/MS detecting at 270℃. By selection of various washing and elution solvents, elution reagents of close polymerization system were of more advantage in template molecules retention and recognition on molecularly imprinted solid phase extraction column. At a certain extent, progesterone, 17α-estradiol, 17β-estradiol and 4-androstene-3, 17-dione could be intercepted on the MISPE column. Especially, MISPE had high selectivity for progesterone, and imprinting TFMAA-co-TRIM polymer could achieve adsorption balance within 50 min by absorption kinetics test for 17β-estradiol. However, MISPE column showed better selectivity and enrichment property for 17β-estradiol than C18 and CSPE columns according to the data from HPLC and GC/MS analyses. Recovery of 17β-estradiol on MISPE column was up to 85.5% while when prime extracting solution of milk powder was sampled, the recovery of CSPE and C18 columns were 43.7% and 30.7%, respectively.

通过研究阐明：紫外聚合产物TFMAA-co-TRIM中的νO-H振动吸收峰在聚合16h后红移，νC=O振动吸收峰在聚合24h后红移；TFMAA-co-TRIM对雌二醇异构体的印迹因子达到了3.01，α为2.28，优于其它功能单体参与得到的聚合物识别特性；TFMAA-co-TRIM聚合物粒径介于300 nm至1.5μm之间，作为色谱固定相具有良好的通量和低的柱压；在乙腈流动相中，TFMAA-co-TRIM分子印迹固定相的分离过程主要被焓驱动，低温有利于分子印迹固定相分离甾醇结构类似物；TFMAA-co-TRIM分子印迹聚合物在255.84℃时开始熔融，Tp=257.40℃，聚合物CP的降解温度在267.79℃，MIP降解温度在343.11℃，制备的固相微萃取头初步经GC/MS 270℃的耐热性测定；不同的洗提溶剂筛选证明了选择接近聚合溶剂的洗脱体系更有利于MISPE发挥识别效应；分子印迹固相萃取柱对孕酮、17α-雌二醇、17β-雌二醇和雄烯二酮都具有不同程度的保留特性，可作为此类化合物的吸附材料，特别对孕酮强保留的富集特性，可作为孕酮的选择性识别吸附剂，其分子印迹聚合物对17β-雌二醇的吸附动力学测定显示在50 min内基本达到吸附平衡，具有作为传感器核心敏感材料的潜力；对比萃取奶粉中17β-雌二醇性能，MISPE柱比非分子印迹固相萃取柱和C18柱具有更高的保留，回收率依次为85.5%，43.7%和30.7%。

And our products to the nutritional health of the apple juice, carrot juice, milk, nucleolus as the main raw material, together with a number of other reagents, modulation into a delicious drink.

而我们的产品以营养健康的苹果汁，萝卜汁，牛奶，核仁为主要原料，再加上一些其他试剂，调制成可口的饮料。

Initiator is one of the most important reagents in the polymerization of olefin and it closely related to the polymerization rate.

引发剂是烯烃聚合的重要助剂，聚合反应速率与之密切相关；引发剂的不同直接影响聚合反应时间和聚合放热的均匀性。

New progress has been got in dephosphorizing of Fe concentrates owing to the development of RA-31 and DA-18 with success. mineral processing ; refractory iron ores ; oolite ; high-phosphorus iron ores ; iron increasing and phosphorus reducing ; flotation reagents

根据鄂西铁矿石的特点进行了选矿药剂及相应的浮选和絮凝选矿工艺的研究，研制成功了RD-31捕收剂和DA-18选择性絮凝剂，采用磁选-脱泥-反浮选工艺流程，对武钢矿业公司科技处提供的鄂西铁矿混合矿样(WE-1样)进行

A variety of functional groups may be tolerated in these organometallic reagents because of their moderate reactivity.

有机锌试剂是一类优良的有机金属试剂，具有较好的官能团相容性和反应选择性。

The process has been shown to be applicable to a variety of both aldehydes and organometallic reagents.

过程一直表现得既适用于各种有机醛试剂。

The application of organometallic reagents in fine organic synthesis.

主族元素的有机金属化合物其三类金属一碳键的性质。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。