美国公共图书馆项目成效测量工具研究

文章首先从整体上介绍了美国公共图书馆项目成效测量工具产生的背景、特点和作用,再详细研究项目的操作,包括其测量的步骤、使用的工具、资源和获得各方的评价等方面,突出项目对我国公共图书馆评估的借鉴意义,为改善并提高国内公共图书馆的服务质量提出几点可行性建议。

Application of the equivalent offset migration method in acoustic log reflection imaging

Borehole acoustic reflection logging can provide high resolution images of nearborehole geological structure. However, the conventional seismic migration and imaging methods are not effective because the reflected waves are interfered with the dominant borehole-guided modes and there are only eight receiving channels per shot available for stacking. In this paper, we apply an equivalent offset migration method based on wave scattering theory to process the acoustic reflection imaging log data from both numerical modeling and recorded field data. The result shows that, compared with the routine post-stack depth migration method, the equivalent offset migration method results in higher stack fold and is more effective for near-borehole structural imaging with low SNR acoustic reflection log data.

Unmanned Aerial Vehicles in Environmental Monitoring——An Efficient Way for Remote Sensing

Airborne photographs can be expediently used in environmental monitoring; e.g., in the surveillance of the state of natural reserve areas, such as wetlands; or in the measurement and mapping of pollutants, such as oil spills on a lake or sea. A new and cost-effective platform of airborne remote sensing is the UAV （unmanned aerial vehicle） or drone. In this experimental work, aerial photos were made in Bakony Mountains using three UAVs equipped with small HD （high definition） cameras; resolution： 1,280 ~ 720 pixels. Within the framework of this work, a small lake was photographed, where the beginning of eutrophication was detected. This hardly can be observed from ground, however, it is visible on the aerial photos. The airborne surveillance of areas of ragweed （Ambrosia sp.） populations was also investigated. It was found that both UAVs are feasible for these tasks, and the application of these platforms for environmental monitoring is advantageous, especially in case of natural reserve areas since those are very silent and--contrary to big aircrafts and helicopters---do not disturb the ecology even in natural reserve areas and the people living there. Moreover, those could be operated in a very flexible and economic way, and the aerial photos taken are highly informative.

Quantification of eight components in Paeonia lactiflora and Glycyrrhiza decoction using UHPLC-MS/MS

Hao Jiang;Yushu Guo;Chao Shi;Department of Pharmacy,Medical Supplies Center of PLA General Hospital;This study aimed to utilize ultra-high-performance liquid chromatography-tandem mass spectrometry(UHPLC-MS/MS)to analyze and quantify eight therapeutic components in Paeonia lactiflora and Glycyrrhiza decoction.The goal was to establish an accurate,efficient,and applicable method for determining the composition of this formula,providing a reference for its clinical application.Methanol was employed to extract the therapeutic components from Paeonia lactiflora and Glycyrrhiza decoction,forming the test sample solution.UHPLC-MS/MS technology was applied to separate and analyze the test samples.The results indicated that upon analysis,the eight reference standards exhibited excellent linear relationships,and the test samples remained stable within 24 h.The content of paeoniflorin,paeonolide,glycyrrhizic acid A,quercetin,chebulic acid,liquiritin,naringenin,and glycyrrhetic acid was determined to be 3.530±0.124,0.139±0.006,0.245±0.008,0.779±0.026,0.433±0.021,0.388±0.018,0.617±0.013,and 0.081±0.005 mg/m L,respectively.This study established that UHPLC-MS/MS analysis demonstrated high efficiency and broad applicability,reflecting the chemical composition characteristics of Paeonia lactiflora and Glycyrrhiza decoction.This research provided a quantitative analysis method for the eight therapeutic components in Paeonia lactiflora and Glycyrrhiza decoction,applicable to its clinical use and quality control.

Simultaneous determination of seven bioactive constituents in Liuwei Wuling tablet by HPLC coupled with DAD

We employed high performance liquid chromatography （HPLC） method coupled with diode array detector （DAD） for the determination of seven major bioactive compounds （forsythoside A, specnuezhenide, phillyrin, schisandrin, schisantherin A, deoxyschizandrin and schisandrin B） in Liuwei Wuling tablet （LWWLT）. The HPLC baseline separation was carried out on an Inertsil ODS-3 column （250 mm×4.6 mm, 5 μm） at 25 ℃ with a gradient elution system composed of 0.1% phosphoric acid solution and acetonitrile. The detection wavelength was set at 230 nm. Calibration curves for seven compounds showed good linear regressions, with correlation coefficients exceeding 0,999 within the tested concentration range. The limits of detection and quantification of each compound were in the range of 0.03-0.28 μg/mL and 0.11-0.87μg/mL, respectively. The relative standard deviation values of precision, stability and repeatability were less than 2.34%. The average recovery of all seven constituents ranged from 96.71% to 103.9%. The validated quantification method was successfully applied for the analysis of 10 batches of commercial LWWLT from Shandong Shibo Jindu Pharmaceutical Co., Ltd. These results would make foundations for quality control and the further pharmacology study of LWWLT.