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GB/T 33794-2017 反应蓝K-RL(C.I.反应蓝105) Reactive blue K-RL(C.I.Reactive blue 105)
本标准规定了反应蓝K-RL(C.I．反应蓝105）产品的要求、采样、试验方法、检验规则以及标志、标签、包装、运输和贮存。<br />本标准适用于反应蓝K-RL的产品质量控制。...
2023-04-29 14:40:02浏览：29
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Enzyme-Mediated Hydrolysis of Poly(ethylene glycol)-Supported Carbonates
1Introduction
Enzymatic kinetic resolution of racemic alcohols or esters is known as a useful method for the preparation of optically active secondary alcohols. However, the work-up including the separation of the mixture of the remaining substrate and the resulting compound spend a lot of time and waste much amount of solvents. On the other hand, organic synthesis based on polymer supports has made rapid progress. Although the methodology is potentially useful for the easy separation of compounds obtained by the enzymatic reaction, there have been relatively few reports on enzymatic resolutions of using a polymer so far. We have noticed that using a watersoluble polymer could be suitable for enzymatic transformation. Here, we report the first example of an enzyme-mediated enantioselective hydrolysis of poly(ethylene glycol)(PEG)-supported substrates with a carbonate moiety to afford optically active compounds, and the method enables us to achieve the easy separation of the products[1]. See Scheme 1....2020-12-22 21:24:13浏览：46
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ACTIVE FRONT STEERING DURING BRAKING PROCESS
An active front steering (AFS) intervention control during braking for vehicle stability is presented. Based on the investigation of AFS mechanism, a simplified model of steering system is established and integrated with vehicle model. Then the AFS control on vehicle handling dynamics during braking is designed. Due to the difficulties associated with the sideslip angle measurement of vehicle, a state observer is designed to provide real time estimation. Thereafter, the controller with the feedback of both sideslip and yaw angle is implemented. To evaluate the system control, the proposed AFS controlled vehicle has been tested in the Hardware-in-the-loop-simulation (HILS) system and compared with that of conventional vehicle. Results show that AFS can improve vehicle lateral stability effectively without reducing the braking performance....
2020-11-10 09:33:08浏览：26
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合成气完全甲烷化催化剂技术研究
通过载体的制备、助剂及活性组分的加入,最终得到担载型NiO·La2 O3·MgO/Al2 O3甲烷化催化剂。在10 mL两段反应装置中进行了甲烷化催化剂1000 h稳定性评价试验,反应条件为：反应温度610益(一段)和313益(二段),反应压力3.0 MPa,平均空速6500 h-1,原料气H2/CO=3.03。试验结果表明催化剂活性基本没有下降, CO转化率平均为99.97%, CH4选择性平均为98.44%。...
2020-10-02 20:35:09浏览：38
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煤岩配煤技术研究进展
针对传统配煤方法繁琐、效率低等问题,从成焦机理方面论述了煤岩配煤的理论基础,阐述了具有代表性的几种煤岩配煤方法,分析了煤岩分析指标与焦炭光学组织之间的关系,并对煤岩配煤的前景进行展望.煤岩配煤理论主要包括煤的不均一性、煤中活性组分质量的差异性、惰性组分的不可或缺性.国外应用较好的煤岩配煤方法为夏皮洛法,适用性强,相关系数达0.93;国内的叶道敏煤岩配煤方法相关系数达到0.98.镜质组反射率与焦炭显微结构之间存在着定性关系,煤中镜质组与焦炭光学组织关系密切,直接影响焦炭光学组织的类型和各向同性与各向异性的比例,最终影响焦炭质量....
2020-09-18 16:34:07浏览：44
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ALSTOM气化炉的线性自抗扰控制
气化炉是整体煤气化联合循环发电技术(IGCC)中关键的部分,其运行性能直接影响到整个IGCC的发电效率.因此,必须对气化炉进行有效的控制.ALSTOM气化炉具有强的非线性及大惯性,常规的控制方法难以满足运行条件下的各项控制指标.通过分析ALSTOM气化炉基准控制问题,将一阶线性自抗扰控制应用于该系统中,设计了两种控制方案.通过测试表明在满足各种约束条件的前提下,其控制性能指标均达到了基准测试所提出的各项要求,且实时解耦能力明显,结构简单,优于传统控制器....
2020-07-12 21:36:56浏览：44
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Effects of pyrolysis temperature and fillers on joining of ceramics via silicone resin
The joining of graphite, ceramic SiC and Cf/SiC composites via preceramic silicone resin(SR) at high temperature (800-1400℃) was studied. The curing and pyrolysis process of SR, pyrolysis temperature, inert and active fillers were especially discussed. The results show that the curing process of SR was accomplished by consuming Si-OH. The temperature of 1200℃ is the appropriate treating temperature for graphite and SiC ceramic, and the temperature of 1400℃ is suitable for Cf/SiC composites. Inert filler SiC powder(5%, mass fraction) has much positive influence on the shear strength of the joints. Active filler nano Ai, Si powder can greatly improve the properties of the joints treated at high temperature. The improvement is over 700%....
2020-07-08 21:52:19浏览：55
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Oxidation kinetics regularity in spontaneous combustion of gas coal
In order to investigate the oxidation kinetics of gas coal at low temperatures, we derived a rate equation of oxygen consumption during low-temperature oxidation of gas coal and deduced an E-c equation, expressing the relation between active energy E and oxygen concentration c. The reaction order n and active energy E were calculated with this equation based on experiments of static oxygen consumption tests. In addition, we proved the rationality of the E-c equation using a kinetic compensation effect and obtained the isokinetic temperature Tc. The results show that: 1) the gas coal oxidizes easily with increasing temperature and the oxidation tends to be spontaneous at higher temperatures; 2) the oxygen concentration c affects oxygen consumption very much at lower temperatures but has only a small effect at higher temperatures; 3) the isokinetic temperature Tc was 127 ℃ which has been experimentally validated as the key turning point during low-temperature spontaneous combustion of gas coal....
2020-06-12 16:16:32浏览：1426
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海洋生物活性物质研究简述
海洋生物已成为天然药物的重要来源之一,从各类海洋生物中可提取分离到具有各种药用活性的化合物,具有开发成新药的潜力。该文对海洋生物活性物质主要种类、研究方法和具体应用进行了简要阐述,同时对海洋生物活性物质的研究方向及前景进行了展望。...
2020-06-12 15:43:46浏览：1432
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丹皮乙醇提取物的抗糖尿病活性研究
对牡丹皮乙醇提取物及各萃取相进行了糖尿病小鼠实验,检测其对血糖及SOD、MDA的影响。结果表明,水相的降糖效果最好,乙酸乙酯相的抗氧化能力最强。综合降糖与抗氧化能力,乙酸乙酯相的抗糖尿病活性最强。...
2020-06-12 15:10:59浏览：1410
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可见光多天线空分键控技术研究
空分键控是一种新型的空间复用技术，每个时刻只有一个发送天线工作，携带信息的是天线的位置而非发送符号本身，因此该种方法频带利用率较低。为了提高频带利用率，基于广义空间调制的概念，提出了光多天线空分键控调制方法，这种调制方式中每个时刻有多个天线同时工作。首先建立了可见光通信中的多天线空分键控系统模型，并对其误码率性能进行了分析。由于通常天线组合数要多于实际需要的，为了减小由空间相关性带来的误码率性能上的下降，提出了一种基于最小欧氏距离最大化准则的天线选择算法以获得误码率性能的增益。最后通过蒙特卡罗仿真比较了有无天线选择的误码率性能，结果验证了该天线选择方法的有效性。...
2020-03-23 19:07:57浏览：1409
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丹皮乙醇提取物的抗糖尿病活性研究
对牡丹皮乙醇提取物及各萃取相进行了糖尿病小鼠实验,检测其对血糖及SOD、MDA的影响。结果表明,水相的降糖效果最好,乙酸乙酯相的抗氧化能力最强。综合降糖与抗氧化能力,乙酸乙酯相的抗糖尿病活性最强。...
2020-03-23 18:21:19浏览：1409
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