Banach空间中的X_d框架与Reisz基

本文引入并研究了Banach空间中的X_d框架,X_d Bessel列,紧X_d框架,独立X_d框架和X_d Riesz基等概念,给出了X_d框架和独立X_d框架的算子等价刻画,Banach空间X中存在X_d框架或X_d Riesz基的充要条件以及X_d框架的对偶框架存在的充要条件,讨论了Banach空间的基和X_d框架,X_d Riesz基之间的关系．     

Particle-In-Cell Simulations from a X Band Coaxial Relativistic Backward Wave Oscillator

A high-power x-band coaxial relativistic backward wave oscillator has been conceptually designed and analyzed. The TM_on dispersion relations in the coaxial corrugated cylindrical waveguide used in the device was calculated. MAGIC,an electronmagnetic particle-in-cell code, is being used to investigated the nonlinear beam-wave interaction and other design optimization issues. Preliminary simulation results shows that the coaxial BWO can generate 2. 2 GW peak power microwave at 10. 15GHz in the TM₀₂ mode driven by a 600-KV 20-KA electron beam, the peak power efficiency is about 18%.     

直接法测定吴茱萸碱磷脂复合物的复合率

建立紫外分光光度法测定吴茱萸碱磷脂复合物复合率.以无水乙醇为空白,225nm为检测波长,测定吴茱萸碱磷脂复合物的复合率.结果表明,吴茱萸碱在1.05-4.20μg·mL-1范围内呈良好的线性关系;其回归方程为A=0.1776C+0.006(r=0.9997);平均回收率为98.04％、RSD为2.95％(n=9).本方法操作简便、准确、重现性好,可为完善该制剂的质量标准提供依据.     

紫外分光光度法测定溴新斯的明-β-环糊精包合物

采用紫外分光光度法测定溴新斯的明环糊精包合物中溴新斯的明含量,测定波长为260nm.溴新斯的明浓度在50-450μg·mL-1范围内与吸光度呈良好的线性关系,回归方程为:A=0.0016C-0.0064,r=0.9999(n=3);平均回收率为100.0％(n=9),RSD为0.31％;日内RSD分别为1.06％、0.71％、0.86％(n=5);日间RSD分别为0.91％、0.61％、0.58％ (n=3);测得3批样品的含量分别为4.83％、4.79％、4.71％.方法操作简便、迅速,具有良好的精密度,适用于溴新斯的明环糊精包合物中溴新斯的明含量的测定.     

紫外分光光度法测定葛根素-二甲基-β-环糊精的包合率

制备葛根素-二甲基-β-环糊精包合物并建立其包合率测定方法.采用紫外分光光度法测定葛根素-二甲基-β-环糊精包合物中葛根素的含量,由此计算包合率.结果表明葛根素在250nm处有最大吸收,浓度在15-65μg ·mL-1时与吸光度呈良好的线性关系,回归方程为:A=0.0129C+0.0313,r=0.9998(n=6);平均回收率为99.23％,RSD为0.68％;测得葛根素-二甲基-β-环糊精的包合率为96.58％,RSD为1.2％.该包合物制备和含量测定方法操作简便易行,准确可靠,得到葛根素-二甲基-β-环糊精包合物的包合率很高.     

Self-assembled metal-organic frameworks nanocrystals synthesis and application for plumbagin drug delivery in acute lung injury therapy

Metal-organic frameworks(MOFs) have recently allured a variety of concern in the fields of nanotechnology. However, exploring their biomedical applications is still a relatively new field. In this work, zeolite imidazole skeleton-8(ZIF-8) was reported for the first time as a drug carrier for the treatment of lung injury. Uniform ZIF-8 nanoparticles encapsulating plumbagin(PLB) are achieved by a facile physical adsorption process. Scanning electron microscopy(SEM), powder X-ray diffraction(PXRD) ...     

从学科融合的角度构建结构化的教学内容*——以“自然资源的开发利用”为例

教学内容的结构化是促进学生从化学学科知识向化学学科核心素养转化的关键措施。自然资源的开发利用以地球的圈层结构为纽带,让学生在问题驱动下,通过阅读、分析教材等活动,逐次学习关于岩石圈、水圈中蕴藏的部分资源开发利用的问题,最后以地球为原点,畅想未来资源的探寻之路。使地理学科知识自然地融合在化学教学中,拓宽学生视野,实现学科间的融合。     

Study on the difference in adsorption thermodynamics for water on swelling and non-swelling clays with implications for prevention and treatment of pneumoconiosis

Excessive inhalation of mineral dust can cause irreversible damage such as diffuse fibrosis of lung tissue. Water-based dust reduction technology can effectively control the dust concentration. The study of the interaction of water-clay mineral dust is helpful to the prevention and treatment of pneumoconiosis by water-based dust removal technology. To better understand the underlying adsorption mechanisms of water molecules on clay mineral dust, the detailed adsorption thermodynamics analysis is necessary. In this paper, we research the thermodynamics of adsorption of water molecules on swelling clay of montmorillonite and non-swelling clay of illite. First, the adsorption isotherms of water molecules on montmorillonite and illite at 293–313 K were measured by gravimetric method. Then, the key thermodynamic variables, including entropy change (ΔS), surface potential (Ω), isosteric heat of adsorption (Q_st) and variation of Gibbs free energy (ΔG), were analyzed. Results illustrate that the adsorption amount for water molecules on illite is one order of magnitude smaller than that on montmorillonite, suggesting that swelling clay plays a dominant role in water molecules adsorption process. For water molecules adsorption on montmorillonite, the contribution of secondary adsorption to total adsorption (a₂/a) is always less than 30%. For water molecules adsorption on illite, the contribution of primary adsorption to total adsorption (a₁/a) is greater than a₂/a at the low pressure region, while a₂/a can exceed 60% at the high pressure region. The difference in the uptakes of water molecules adsorption on non-swelling and swelling clays is mainly resulted from the difference in primary adsorption on two clays. The Henry’s constant (K_AA) for montmorillonite is in the range of 21.37–75.08 mmol/g/kPa, which is evidently larger than the K_AA values of 0.34–0.98 mmol/g/kPa for illite. Compared with non-swelling clay, the adsorption spontaneity degree for water molecules on swelling clay is higher, and the interaction of swelling clay-water molecules is stronger. Meanwhile, the movement of adsorbed water molecules in swelling clay is more confined than that in non-swelling clay. These findings can offer meaningful guidelines for the prevention and treatment of pneumoconiosis.     

转矩转速测量装置示值引用误差测量不确定度评定

指出了JJG924-1996《转矩转速测量装置》中对转矩转速示值测量不确定度评定时存在的4 个问题. 同时给出了对转矩转速示值引用误差进行测量不确定度评定的一种新方法，给出了一个 实例来说明该方法的具体应用.     

一种新型光谱表面等离子体共振二维探测方法在DNA微阵列中的应用

在此前曾提出过一种新型二维折射率探测方法——并行扫描光谱表面等离子体共振(surface plasmon resonance, SPR)成像方法。在这种方法中,使用线形光照明,CCD得到的图像包含SPR光谱信息和一维空间信息,进而通过计算可得到折射率的一维分布信息。通过一维扫描,就能够得到整个被扫描区域内的折射率二维分布信息。该方法具有高灵敏、高通量的优点,适合微阵列(microarray)的检测, 并完善了这种方法的数据处理过程,使用空气折射率作为参考,消除了无法精确控制入射角的难题。使用该方法对手工点制的军团菌mip DNA探针微阵列进行了检测,证明了这种方法高灵敏无标记地探测微阵列的可行性。我们得到的军团菌mip DNA探针制备浓度与其等效折射率的关系,这对基于SPR的微阵列技术的发展有着重要的参考意义。