Detection of trace triclocarban in water sample using solid-phase extraction-liquid chromatography with stochastic resonance algorithm

Based on the theory of stochastic resonance, a new algorithm was presented to enhance the signal-to-noise ratio (SNR) of weak HPLC/UV signals of triclocarban in water samples with a new method for optimizing the system parameters. The method was applied to experimental weak signals of HPLC/ UV, which was embedded in the noise background, and the SNR was enhanced greatly. The algorithm was employed to detect triclocarban residue in water with solid-phase extraction--high-performance liquid chromatography. The limit of detection and the limit of quantification were improved from 10 ng L(-1) and 50 ng L(-1) to 1 ng L(-1) and 5 ng L(9-1), respectively. The results showed an excellent quantitative relationship between concentrations and chromatographic responses.     

Light absorption distribution of prostate tissue irradiated by diffusing light source

Determination of light absorption distribution in the prostate tissue irradiated by diffusing light source is important for the treatment planning.In this paper,a three-dimensional(3D)optical model of human prostate is developed,and the light absorption distribution in the prostate tissue is estimated by Monte Carlo simulation method.Light distribution patterns including 3D distributions in the tissue model irradiated by two diffusing light sources are obtained and compared.Also,the impacts of length and energy of cylinder diffusing light source on the irradiance volume are demonstrated.Those results will be significant for the nondestructive qualitative assessments of photodosimetry in biomedical phototherapy.     

Using pectin to separate talc and molybdenite through the surface modification with Cu2+:Applications and mechanism

Organic depressants have low selectivity in separating molybdenite and talc because their metal sites lack activity for organics chemisorption. In this study, surface modification by copper sulfate was used to induce the differential adsorption of pectin onto molybdenite and talc surfaces for enhanced flotation separation. Contact-angle experiments, scanning electron microscopy, adsorption measurements, timeof-flight secondary-ion mass spectrometry, and X-ray photoelectron spectroscopy analyses ...     

Model-Free Adaptive Frequency Calibration for Voltage-Controlled Oscillators

The operating frequency accuracy of the local oscillators is critical for the overall system performance in the communication systems. However,the high-precision oscillators could be too expensive for civil applications. In this paper, we propose a model-free adaptive frequency calibration framework for a voltage-controlled crystal oscillator(VCO)equipped with a time to digital converter(TDC),which can significantly improve the frequency accuracy of the VCO thus calibrated. The idea is to utiliz...     

Event-Driven Non-Intrusive Load Monitoring Algorithm Based on Targeted Mining Multidimensional Load Characteristics

Nowadays, the advancement of nonintrusive load monitoring(NILM) has been hastened by the ever-increasing requirements for the reasonable use of electricity by users and demand side management. Although existing researches have tried their best to extract a wide variety of load features based on transient or steady state of electrical appliances, it is still very difficult for their algorithm to model the load decomposition problem of different electrical appliance types in a targeted manner to j...     

具有泵送控释特性的肠靶向海藻酸钙基Janus胶囊（英文）OA

本研究成功开发了一种具有泵送控释特性的新型肠靶向θ型胶囊,用于疏水性药物的可控释放。该胶囊由海藻酸钙-壳聚糖/鱼精蛋白/二氧化硅（ACPSi）复合壳和呈θ形状的两个腔室组成（θ-ACPSi）,两个腔室分别封装有药物和助推剂。肠溶性羟丙甲纤维素酞酸醋（HPMCP）微球嵌入到药室的外壳中。θ-ACPSi的外壳在胃部环境中为所封装的药物提供了更好的保护,而在肠道中表现出出色的肠靶向药物释放特性。以吲哚美辛为模型药物、聚丙烯酸（PAA）为助推剂,药室壳层“微通道”的打开和助推室中PAA的溶胀均有助于提高高浓度吲哚美辛的释放速率,保证了吲哚美辛在小肠部位具有恒定的释放速率。在胃中（pH=2.5）,只有不到1%的吲哚美辛被释放。然而,当θ-ACPSi胶囊进入小肠（pH=6.8）时,药室外壳中的HPMCP微球因溶解而打开“微通道”,而PAA溶胀以提供泵送动力。结果,超过60%的吲哚美辛在小肠中以恒定速度释放。所制备的θ-ACPSi胶囊为开发响应型泵送控释系统和肠靶向药物递送系统提供了一种潜在的新型模式。     

Experimental modal analysis on damage of skeleton in brake of airplane

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Electrochemically Grown Ultrathin Platinum Nanosheet Electrodes with Ultralow Loadings for Energy-Saving and Industrial-Level Hydrogen Evolution

Nanostructured catalyst-integrated electrodes with remarkably reduced catalyst loadings, high catalyst utilization and facile fabrication are urgently needed to enable cost-effective,green hydrogen production via proton exchange membrane electrolyzer cells(PEMECs). Herein, benefitting from a thin seeding layer, bottom-up grown ultrathin Pt nanosheets(Pt-NSs) were first deposited on thin Ti substrates for PEMECs via a fast, template-and surfactant-free electrochemical growth process at room tempe...     

Ultrafast Synthesis of Metal-Layered Hydroxides in a Dozen Seconds for High-Performance Aqueous Zn(Micro-) Battery

Efficient synthesis of transition metal hydroxides on conductive substrate is essential for enhancing their merits in industrialization of energy storage field. However, most of the synthetic routes at present mainly rely on traditional bottom-up method, which involves tedious steps, time-consuming treatments, or additional alkaline media, and is unfavorable for high-efficiency production. Herein, we present a facile, ultrafast and general avenue to synthesize transition metal hydroxides on carb...     

Electrochemical Carbon Dioxide Reduction to Ethylene: From Mechanistic Understanding to Catalyst Surface Engineering

Electrochemical carbon dioxide reduction reaction(CO₂RR) provides a promising way to convert CO₂ to chemicals. The multicarbon(C₂₊) products, especially ethylene, are of great interest due to their versatile industrial applications. However, selectively reducing CO₂ to ethylene is still challenging as the additional energy required for the C–C coupling step results in large overpotential and many competing products. Nonetheless, mechanistic understandi...