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- The content of product can increased to 40% by direct extraction for 3 times with ethyl acetate and successive extraction for 4 times with aether from sample solution of Echinacea purpurea extract(pH3). pH3的原料液直接用乙酸乙酯萃取3次和乙醚萃取4次可以得到纯度40%25左右的产品,两步萃取收率都在90%25以上。
- Performances of direct extraction of gold from alkaline cyanide solution with guanidine hydrochloride were studied. 研究了盐酸胍直接从碱性氰化液中萃取金的性能。
- An improved direct extraction method for preparation of neodymium iso-octanate with NaOH instead of NH3. 用氢氧化钠溶液代替氨水直接萃取法制备异辛酸钕。
- A new method for direct extracting sodium phytate from corn-soaking, the by-product produced in the process of corn fermentation, was provided. 采用正交实验法探讨了利用玉米发酵过程中产生的副产物玉米浸渍水直接制取植酸钠的新工艺。
- A new technology of direct extraction by methanol was set up to prepare the crude polysaccharide from mycelia of Panaeolus cincutlus. 建立了环带斑褶菇菌丝体粗多糖的甲醇一步提取法。
- In this article,the preparation of resveratrol such as direct extraction from natural plants,chemical synthesis,and biotechnology were reviewed. 首先,综述了白藜芦醇从天然植物中直接提取、化学合成、利用生物技术制备的方法;
- Stress on summerize technology of direct extraction of cottonseed kernels and de gossypol with alcohol commercial hexane mixed solvent. 侧重介绍乙醇轻汽油混合溶剂一次浸出棉仁脱酚工艺。
- However, the space charge effect seriously limits the direct extraction a low-energy ion beam containing industrially-satisfied high current. 然而，由于空间电荷的累积效应，严重地限制了引出一具有高电流的低能量离子束。
- Because the wavelet transform is the kernel of image compression standard of the new generation, the method can be used for direct extraction and retrieval in compression domain. 同时，由于小波变换已经成为新一代图像压缩标准的核心，该方法可以直接在压缩域进行特徵提取和检索。
- Based on the application of CEMS to the coal-fired generating unit of Jiaozuo Power Plant,the working principle of a CEMS based on heating type direct extraction is presented. 以烟气连续排放监测系统在焦作电厂燃煤发电机组上的应用为例,介绍了一种加热式直接抽取法烟气连续监测系统的原理,分析了系统组成及功能、系统运行及系统的维护检修。
- She cast her eyes down to avoid direct eye contact. 她垂下双目以避免对视。
- I'll book you on a direct flight to London. 我将为你预订直飞伦敦的航班。
- He has chosen the most direct route. 他选取了最直的路线。
- The samples from different species of Meloidae, the eggs of Epicauta aptera Kaszab and the different parts of Mylabris phalerata Pallas were treated with acidolysis or direct extraction, and cantharidin contents were determined by gas chromatography. 分别采用酸水解法和直接浸提法处理不同种芫菁样品、短翅豆芫菁Epicauta aptera Kaszab的卵和大斑芫菁Mylabris phalerata Pallas的不同虫体部位,后用气相色谱仪测定斑蝥素含量。
- In the paper a method for direct extraction of boundary from point clouds of freeform surface is proposed by taking the point clouds of the glass cabin cover of a battle plane as an example. 该方法不仅具有较高的运算效率，达到了系统的实时性要求，而且能够比较精确地表达曲面的边界特征。
- The transformation of sodium tungstate solution,direct extraction of sodium tungstate under alkali conditions and separation of molybdenum from tungsten by solvent extraction are mainly introduced. 主要介绍了钨酸钠溶液的萃取转型、碱性条件下钨酸钠溶液直接萃取和萃取法分离钨、钼工艺研究进展。
- She's very direct, believes in speaking her mind. 她为人直率，喜欢有什么说什么。
- Can you direct me to the shoe department? 请告诉我卖鞋部在哪里。
- Be there a direct train for Beijing to Nanning? 从北京到南宁有直达车吗？
- See that direct heat does not play on it. 当心别让它直接受热。
