-
国产EAA要突破吗？谁在争吃螃蟹
国产EAA要突破吗？谁在争吃螃蟹
聚烯烃人
聚烯烃人
微信号
longpu2017
功能介绍
为聚烯烃创造着，快乐着，骄傲着！
收录于话题
2021中国...2021-07-19 23:01:43浏览：127
查看 -
A bird in trap--the analysis of Tess
This essay will analyze the heroine of...
2020-12-06 21:11:24浏览：68
查看 -
An Analysis of Symbolism in A Passage to India
E. M. Forster is a very famous traditional novelist, who is good at using symbolism to interpret the themes in his novels. At the beginning of this essay, the author briefly introduces Forster's life story, and then analyzes the use of symbols in his masterpiece A Passage to India....
2020-11-22 17:58:37浏览：58
查看 -
The Analysis of Catherine in A Farewell to Arms
Catherine Barkley,as the heroine in the novel A Farewell to Arms,has a rather complicated personality.The thesis,to begin with,analyzes her character in two sides with examples.One the one hand,she is obedient,maternal,mature and optimistic,yet on the other hand,she depends on love too much and is not confident enough.The thesis then analyzes Catherine's attitudes towards love,war and death.Though her attitudes and experience,author express the cruelness of war and his hatred towards war....
2020-11-22 17:58:37浏览：65
查看 -
ANALYTIC SENSITIVITY ANALYSIS FOR SHAPE OPTIMIZATION
Analytic sensitivity analysis technology for the boundary element method (BEM) is presented, combined with a shape optimization system for structural analysis. A shape optimization was done for an elastomer under planar stress, based on this new algorithm. A multi-object problem was studied as an illustrative example for the progranmer, using weighted summing method. The result is feasible....
2020-11-22 17:58:37浏览：45
查看 -
Stylistics Analysis of A Rose for Emily
A Rose for Emily is a short story by American writer William Faulkner first published in April 30,1930.The story takes place in Faulkner's fictional city,Jefferson,Mississippi.This article is going to analyze A Rose for Emily from the perspective of stylistics....
2020-11-22 17:58:37浏览：57
查看 -
Curriculum Analysis
The English as a Second Language （ESL） Curriculum for grades K - 12 is a scope that builds and develops linguistic proficiency for students between the ages of six and 21 years. The ESL professionals defines ESL students as those students who are non - native English speakers and who may or may not have English proficiency....
2020-11-22 17:58:37浏览：60
查看 -
Comparative Process for the Preparation of 9-Oxime Erythromycin A
The comparative process for preparing 9-oxime erythromycin A (EMAO) is investigated. EMAO was synthesized and compared by the reaction of erythromycin and hydroxylamine hydrochloride with various bases such as sodium acetate, triethylamine, etc. A new synthetic method is established. The oximation is performed under dynamic buffer system; less degradation impurities are formed. The yield of EMAO reaches more than 95%, HPLC analysis shows that the purity of EMAO is more than 90%, and the E/Z isomeric ratio preponderates over 7∶1....
2020-11-11 22:33:38浏览：65
查看 -
-
电力节能技术在电力技术中的应用
企业需要加强对电力计量的管理，有两层含义，其一就是避免因为计量问题而给企业经营带来的隐患，对运行的重要电能计量装置施行质量跟踪、状态监测、抽样检定、动态管理，定期进行对在用计量装置测试数据分析，避免计量装置失准运行，提高在用电能计量装置准确性；其二就是根据电能计量的结果制定相关长效机制，减少不必要的电能损耗或者使用，降低企业产品的成本。...
2020-10-26 22:14:25浏览：28
查看 -
Simulating confined swirling gas-solid two phase jet
A k-ε-kp multi-fluid model was used to simulate confined swirling gas-solid two phase jet comprised of particle-laden flow from a center tube and a swirling air stream entering the test section from the coaxial annular. After considering the drag force between the two phases and gravity, a series of numerical simulations of the two-phase flow of 30μm, 45μm, 60μm diameter particles were performed on a x×r＝50×50 mesh grid respectively. The results showed that the k-ε-kp multi-fluid model can be applied to predict moderate swirling multi-phase flow. When the particle diameter is large, the collision of the particles with the wall will influence the prediction accuracy. The bigger the diameter of the particles, the stronger the collision with the wall, and the more obvious the difference between measured and calculated results....
2020-09-15 12:28:59浏览：67
查看 -
阿哌沙班的合成
对硝基苯胺经酰胺化、环化、双氯取代、消除反应得关键中间体3-(吗啉-4-基)-1-(4-硝基苯基)-5,6-二氢-1H-吡啶-2-酮(5);同时,对甲氧基苯胺经重氮化后,与2-氯乙酰乙酸乙酯通过Japp-Klingemann反应,得到中间体2-氯-2-[2-(4-甲氧基苯基)腙]乙酸乙酯(6).中间体5与6进行[1+3]偶极环加成反应、脱吗啉、还原、酰胺化、环化、氨解反应得到Xa因子直接抑制剂阿哌沙班.反应总收率为25％(以对硝基苯胺计),纯度为99％.优化后的工艺与文献报道的工艺相比,反应条件温和,操作步骤简便,更适宜工业生产....
2020-07-07 22:08:29浏览：44
查看 -
Changes of Tumor Necrosis Factor, Surfactant Protein A, and Phospholipids in Bronchoalveolar Lavage
To evaluate the alterations of biomarkers in the development and progression of coal workers'pneumoconiosis (CWP). Methods The type and number of cells, and the levels of tumor necrosis factor-alpha (TNF-α),pulmonary surfactant protein, phospholipids and fibronectin in bronchoalveolar lavage fluid were assayed in 14 health active coal miners, 21 coal miners without CWP and 13 miners with CWP of 0/1 to 1/1. Results Compared to active coal miners without CWP (8.23 μg/mL), TNF-α concentration was gradually decreased when dust exposure was stopped (5.90 μg/mL).Elevated surfactant protein A (SP-A) level and phosphatidylglycerol (PG) to phosphatidylinositol (PI) ratio were found in miners actively exposed to coal dust (6528 ng/mL for SP-A and 10. for PG/PI), and both parameters decreased when CWP progressed from CWP (0/1) (3419 μg/mL for SP-A and 5.9 for PG/PI) to CWP (1/1) (1654 μg/mL for SP-A and 5.5 for PG/PI).Conclusion Biomarkers in bronchoalveolar lavage fluid can be used to screen coal miners at high risk of developing coal workers' pneumoconiosis....
2020-06-12 16:18:31浏览：1422
查看
