查询词典 chemical method

Then chemical oxygen demand and total phosphorus were determinated by nano-semiconductor oxide photocatalytic method.

其次，将纳米半导体光催化氧化体系用于化学需氧量和总磷的测定，进行了有关理论探讨和实际应用的研究，取得了满意的结果。

In the program, on theoretically we have studied the effects of configuration, the arranged periodic length and the refractive index ratio on PBG using finite difference time dormain method; on experimental, we have synthesized monodispersed silaca microspheres with size of 150-320 nm by colloidal chemical methods. And 3D perfect photonic crystals were prepared using the evaporating of acetone self-assembling the monodispersed SiO2 microspheres on quartzes by and horizontal and vertical deposition methods.

在本项目的研究中，理论上我们应用有限时阈差分法研究了光子晶体光子带隙形成与空间构型、排列的周期长度及折射率比之间的关系；实验上，我们应用胶体化学方法制备了150-320 nm的SiO2胶体微球，以丙酮为挥发溶剂，通过水平重力沉积法和垂直自然吸附法制备了各种粒度、排列完美的面心立方光子晶体。

With regard to the question how to cut the helical camber of screw-pump and spiral rod drilling tool in the field of petroleum machine and chemical machine, this paper firstly puts forward the cutting method how to apply the milling with non-instantaneous-pole envelope principle with plate milling cutter in our country.

本论文针对石油、化工机械领域螺杆泵、螺杆钻具转子的螺旋曲面切削加工问题，在国内首次提出了应用盘铣刀的无瞬心包络铣削加工方法。

And some new attempt for the prebiotic syntheses of amino acids and nucleotides has been taken, thus a new method for the study of the chemical origin and evolution of some biologically fundamental molecules was brought forward.

总之，通过本文的研究，初步揭示了低能离子与溶液体系作用的特点，对氨基酸、核苷酸等重要生命小分子的前生物合成做了新的尝试，继而为研究生命分子的化学起源与进化提供了全新的方法。

Because China has not complete special package management law and regulation,this paper studies the law and regulations related to commodity package articles such as environmental protection law,temporary package resources recovery management method,clean production law,health food law,drug management law,solid waste pollution environment protection law,import and export commodity examination law,dangerous chemical commodity package and container fixed point production management law,rail commodity transpor...

鉴于我国目前尚无完整专门的包装管理法规，就现行我国与商品包装有关的环境保护法，包装资源回收利用暂行管理办法，清洁生产促进法，食品卫生法，药品管理法，固体废物污染环境防治法，进出口商品检验法，危险化学品包装物，容器定点生产管理办法，铁路货物运输规程等法规，研究指出了其与商品包装密切相关的条款。

This model not only provides a new method to calculate~(31)P chemical shifts of phosphines,but also establishes the rela...

所建模型不仅在一定程度上阐明了膦类化合物31P NMR谱化学位移与其分子结构信息之间的关系，同时也提供了一种从理论上计算膦类化合物31P NMR谱化学位移的新方法，并对深入了解膦类化合物结构与性能的关系及解析、预测其31P NMR谱提供了一定的理论依据。

The content of assemble alkaloids of huperzine in 10 different geographical populations of Huperzia serrata and Phlegmariurus cryptomerianus from Zhejiang and Fujian Province was determined,and their phenetic differentiation in chemical composition was studied using the method of dedentred correspondence analysis based on their UV spectra.

对来自浙江、福建境内石杉科植物蛇足石杉、柳叶马尾杉10个不同地理居群的石杉总碱含量进行了测定，并基于紫外光谱，对它们的表型分化进行了除趋势对应分析。

Determination of Tyrosine in Urine Spectrophotometric Method;2. For chemical pre-extraction, MSTFA/TMSL derivatization reaction, GC/MS analysis, it is confirmed that two main metabolites (19-no-randrosterone and 19-noretiocholanolone) were found in nandrolone urine.

本文对合成的19-去甲雄烷醇酮的四个差向异构体混合物进行气相色谱分离，对诺龙和炔诺酮用药后，留取的人尿样通过化学预处理，MSTFA/TMSI衍生化反应，GC/MS分析，确证了尿样中诺龙的两个主要代谢产物为19-去甲雄酮和19-去甲原胆烷醇酮，炔诺酮的两个主要代谢物是四氢炔诺酮的两个形式，可能是3α-OH-5α-THINE和3α-OH-5β-THINE，在炔诺酮代谢前期，还发现有诺龙的上述两个代谢物存在。

The basic knowledge of development trend and the environmental factors, quarantine, prevention and cure period, the relationship between plant communities, and summary of forest prevention and control, quarantine prevention, physical and chemical control and biological control method.is as follows.

基本摸清了该虫发展趋势与环境因子、检疫、防治时期、植物生态群落之间的关系，并总结出营林防治、物理防治、检疫防治、生物防治、化学防治等防治方法。

The invention relates to a rare-earth metal oxide supported transition metal or transition metal alloy catalyst and the method of on the catalyst, using alcohol or alcohol water solution catalytic chemical deposition to prepare nano carbon fiber and 3D order nano carbon stacking structure.

本发明涉及一种稀土金属氧化物担载过渡金属或过渡金属合金催化剂及利用在该催化剂上，乙醇或乙醇水溶液催化化学沉积制备纳米碳纤维和三维有序纳米碳纤维堆积结构的方法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。