搜索到63621篇“ SIMPLE“的相关文章
An Affordable and Easily Accessible Approach for Acrylonitrile Monomer Purification through a Simple Column Technique
2024年
This manuscript presents a dataset detailing a method for purifying monomers. Purification plays a crucial role in every chemical process, as it leads to an improvement in product quality through the removal of impurities. The primary method for monomer purification, like acrylonitrile (AN), is the distillation technique. However, this technique is unsafe and hard to set up or handle. A straightforward, risk-free, low-cost method like the column technique resolves these issues. A simple column technique demonstrated the successful execution of purifying AN. Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) analyses confirmed that AN was successfully purified, with purity reaching 99.8%. FTIR spectra revealed changes in the position and intensity of the stretching vibration peaks after purification. Also, the functional groups of the inhibitor monomethyl ether of hydroquinone (MeHQ) were undetected after purification. Furthermore, after purification, NMR spectra revealed the absence of aromatic protons and carbons associated with MeHQ. In conclusion, the column technique is a successful and inexpensive way to purify AN monomers. This makes it useful for a wide range of applications, especially in polymerization reactions where MeHQ needs to be removed to prevent self-polymerization during the initiation process.
Rawdah WhbaMohd Sukor Su’aitAzizan Ahmad
关键词:ACRYLONITRILEPURIFICATION
Development of a Simple Extraction Method for Tetracycline Analogues from Bovine Milk
2024年
Tetracycline and analogues are among the most used antibiotics in the dairy industry. Besides the therapeutic uses, tetracyclines are often incorporated into livestock feed as growth promoters. A considerable amount of antibiotics is released unaltered through milk from dairy animals. The presence of antibiotic residues in milk and their subsequent consumption can lead to potential health impacts, including cancer, hypersensitivity reactions, and the development of antibiotic resistance. Thus, it is important to monitor residual levels of tetracyclines in milk. The purpose of this study is to develop a quick and simple method for simultaneously extracting five tetracycline analogues from bovine milk. Specifically, five tetracycline analogues: Chlortetracycline (CTC), demeclocycline (DEM), doxycycline (DC), minocycline (MC), and tetracycline (TC) were simultaneously extracted from milk using trifluoroacetic acid. Subsequently, the extracted analogues were separated by reverse-phase high-performance liquid chromatography (RP-HPLC) and detected at 355 nm using UV/Vis. Calibration curves for all five tetracycline analogues show excellent linearity (r2 value > 0.99). Percent recovery for MC, TC, DEM, CTC, and DC were: 31.88%, 96.91%, 151.29, 99.20%, and 85.58% respectively. The developed extraction method has good precision (RSD < 9.9% for 4 of the 5 analogues). The developed method with minimal sample preparation and pretreatment has the potential to serve as an initial screening test.
Oscar CordovaThien LeChristopher LambertDevin BrodieStephany RamirezFrancis SandovalKarno Ng
关键词:ANTIBIOTICSTETRACYCLINESMILK
Short and Simple
2024年
How stories from ordinary people hold extraordinary social value.During a two-week trip to my native Xinjiang Uygur Autonomous Region in northwest China,I contemplated the following question:Born and raised in the region until the age of 18,how can I tell the stories that unfold here to people on the outside?The stories of ordinary locals are very simple,to the point that many people feel they hold no real“news value.”But for those who have lived through Xinjiang’s difficult times,the present is hard-won.
FRIEDA LI
关键词:OUTSIDENORTHWEST
沙发(3265 SIMPLE)
1.本外观设计产品的名称:沙发(3265 SIMPLE)。;2.本外观设计产品的用途:本外观设计产品用于家具。;3.本外观设计产品的设计要点:在于形状。;4.最能表明设计要点的图片或照片:主视图。
帕斯夸莱·纳图兹
废旧纺织品脱色简易方法被引量:1
2024年
针对废旧纺织品回收后的脱色处理进行研究。由于废旧纺织品组分复杂多样,染色所用染料也各有不同。研究废旧纺织品中占比较大的涤、纤维素类纤维织物的脱色工艺,采用比较简易的脱色工艺处理,脱色率基本达到80%左右,可以结合后续面料回收利用的途径进行适宜的脱色处理。
盛春英惠杰王旭洲王旭洲田峰孙沙沙孙沙沙郭春辉
关键词:废旧纺织品脱色
单纯性骨囊肿的研究进展
2024年
单纯性骨囊肿(SBC)又称为单房性骨囊肿或孤立性骨囊肿,是一种良性骨肿瘤病变。疼痛虽是SBC的第一症状,但大多数患者无症状。其病因及发病机制尚不明确,静脉阻塞假说是界内较为公认的假说。X线检查是SBC的首选检查方法。SBC治疗方式多样,常见并发症包括囊肿复发、再骨折、感染、肢体畸形等,其最佳治疗方式尚存争议,但大多数治疗方式均有效,患者预后良好。该文就SBC的流行病学、病因及发病机制、临床表现、影像学表现、治疗方法、并发症、预后做一综述,以期为临床提供参考。
于浩许波许波朱振宇(综述)李刚(审校)
关键词:单纯性骨囊肿发病机制手术治疗
A Simple Mechanism for Generating a Geomagnetic Field
2024年
On the basis of the ideal gas model, the polarization of charges in the mantle was obtained, a physical and mathematical model was constructed, and estimated calculations of the dipole mode of the Earth’s magnetic field were performed, taking into account the speed of its angular rotation, the parameters of density and temperature, the chemical composition, the ionization potential, the dielectric constant and the percentage of the main chemical compounds of the mantle substance.
Oleg Vladimirovich Styazhkin
Simple collective model for nuclear chiral mode
2024年
A simple semi-analytical collective model that takes into account the limitations of the variation interval of the collective variable is suggested to describe the chiral dynamics in triaxial odd−odd nuclei with a fixed particle−hole configuration.The collective Hamiltonian is constructed with the potential energy obtained using the postulated ansatz for the wave function symmetric with respect to chiral transformation.By diagonalizing the collective Hamiltonian the wave functions of the lowest states are obtained and the evolution of the energy splitting of the chiral doublets in transition from chiral vibration to chiral rotation regime is demonstrated.
R.V.JolosE.A.KolganovaD.R.Khamitova
关键词:COLLECTIVEMODELNUCLEARCHIRAL
唯物辩证法的普遍智慧与简约话语被引量:1
2024年
唯物辩证法科学揭示了大千世界存在发展的共同法则,贡献了具有普遍意义的哲理智慧与简约话语。唯物辩证法体现为自然辩证法、历史辩证法和思行辩证法,其时代精神精华成为现代人们求实进取的智慧话语。习近平新时代中国特色社会主义思想实现了唯物辩证法中国化时代化的新发展与新飞跃,是凸显时代强音的科学世界观和方法论。融通文明、引领创造的唯物辩证法既是人类文明的希望话语,也是中国与世界迎接未来挑战的普遍智慧。
严小成
关键词:唯物辩证法
实变函数中简单函数的研究
2024年
实变函数较之数学分析更加抽象复杂,是近代数学的重要基础。简单函数是实变函数中非常基础且具体的重要函数类。围绕简单函数与可测函数间的联系,及其在Lebesgue积分中的运用等问题开展研究,探讨简单函数在实变函数教学中的广泛应用,以期实现降低学习的难度提升实变函数的教学效果目的。
李晓萌秦喜梅苏先锋
关键词:实变函数LEBESGUE测度LEBESGUE积分

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