受老空水威胁工作面巷道防治水实践

针对高庄煤矿3_上1104回风巷为沿空掘巷,巷道掘进期间受3_上1102老空水威胁,掘进开采存在严重的水患安全问题,采用超前打设疏水孔的方案来治理老空水威胁,对巷道采用调向增大护巷煤柱厚度等措施实现巷道安全快速掘进,探放水期间无淹巷情况发生,探放水后巷道顶板和上帮无淋水现象发生。     

着-聚赖氨酸/淀粉抑菌膜的制备及性能检测

对以淀粉为成膜基质,海藻酸钠和甘油为增塑剂,ε-聚赖氨酸为抑菌剂的淀粉基抑菌膜进行研究,并对其抑菌性和膜性能进行检测。结果表明,ε-聚赖氨酸对大肠杆菌、枯草芽孢杆菌和酵母菌的最低抑菌浓度分别为1、2、2μg/mL,而将ε-聚赖氨酸添加到淀粉膜后,最低抑菌浓度都提高到64 mg/g,对淀粉膜和抑菌膜的力学性能、红外光谱检测、透气性和透油性及膜液的流变性、接触角等比较,差异较小。     

Standing Surface Acoustic Wave (SSAW)‐Based Fluorescence‐Activated Cell Sorter

Microfluidic fluorescence‐activated cell sorters (μFACS) have attracted considerable interest because of their ability to identify and separate cells in inexpensive and biosafe ways. Here a high‐performance μFACS is presented by integrating a standing surface acoustic wave (SSAW)‐based, 3D cell‐focusing unit, an in‐plane fluorescent detection unit, and an SSAW‐based cell‐deflection unit on a single chip. Without using sheath flow or precise flow rate control, the SSAW‐based cell‐focusing technique can focus cells into a single file at a designated position. The tight focusing of cells enables an in‐plane‐integrated optical detection system to accurately distinguish individual cells of interest. In the acoustic‐based cell‐deflection unit, a focused interdigital transducer design is utilized to deflect cells from the focused stream within a minimized area, resulting in a high‐throughput sorting ability. Each unit is experimentally characterized, respectively, and the integrated SSAW‐based FACS is used to sort mammalian cells (HeLa) at different throughputs. A sorting purity of greater than 90% is achieved at a throughput of 2500 events s^?1. The SSAW‐based FACS is efficient, fast, biosafe, biocompatible and has a small footprint, making it a competitive alternative to more expensive, bulkier traditional FACS.     

Biomimetic Engineering of a Scavenger‐Free Nitric Oxide‐Generating/Delivering System to Enhance Radiation Therapy

Nitric oxide (NO) is a potent tumor‐cell radiosensitizer but it can be readily scavenged by hemoglobin (Hb) in vivo. A biomimetic incubator that can generate and deliver NO in a scavenger (Hb)‐free environment to enhance its radiosensitizing effect to maximize its efficacy in radiotherapy is proposed. This NO incubator comprises a poly(lactic‐co‐glycolic acid) (PLGA) hollow microsphere (HM) that contains an NO donor (NONOate) and a surfactant molecule (sodium caprate, SC) in its aqueous core. In acidic tumorous environments, the PLGA shell of the HM allows the penetration of protons from the outside, activating the hydrolytic cleavage of NONOate, spontaneously generating NO bubbles, which are immediately trapped/stabilized by SC. The SC‐stabilized NO bubbles in the HM are then squeezed through the spaces of its PLGA matrices by the elevated internal pressure. Upon leaving the HM, the entrapped NO molecules may passively diffuse through their SC‐stabilized/protected layer gradually to the tumor site, having a long‐lasting radiosensitizing effect and inhibiting tumor growth. The entire process of NO generation and delivery is conducted in a scavenger (Hb)‐free environment, mimicking the development of young ovoviviparous fish inside their mothers' bodies in the absence of predators before birth.     

挤出机(四)

9 挤出机的三个技术参数“挤出压力、产量、功率” 挤出压力、产量、功率三个指标是挤出机互为因果关系的重要技术参数,在挤出机设计和使用中三者关系始终保持着一种平衡状态.     

基于高校特点的体育馆建筑设计研究——以南阳师范学院体育馆为例

高校体育馆在教学、管理及使用功能等方面不同于社会体育馆.通过对南阳师范学院体育馆建筑设计分析,从环境关联性、多功能综合性、文化延续性三个方面,探讨了高校体育馆的建筑设计特点及发展趋势.     

履带车辆识别地面不平状态的一种方法

履带车辆对不同地表感受到的粗糙程度可以用支重轮位置偏离静平衡位置的程度以及车辆悬挂部件、行走装置的参数来表示，因而可估计在附近一段区域内各种工况下对换挡的要求。在车辆行驶方向上分析履带车辆在不同地面情况下支重轮偏离静平衡位置的各种情况，结合车辆的支重轮个数及履带与地面接触面积，给出表示地面不平状况的计算式。该地面不平状况可用来作为履带车辆自动变速智能换挡的一个输入参数。