鲍店煤矿第四系下组底部含水层可疏性研究

本文根据鲍店井田西部第四系中组隔水层分布、下组隔水层分布、下组含水层富水性及下组含水层水位动态等方面分析了第四系下组底部含水层疏干可能性,并对留设防砂安全煤岩柱开采条件下的矿井涌水量进行了预计。

煤层底板厚层砂岩含水层可疏性综合评价

为了指导煤层底板砂岩水害的防治工作,需要对含水层的可疏性进行合理评价。结合典型矿井的水文地质条件和水害案例,对水文地质钻孔抽水试验资料进行分析,初步评价了底板砂岩含水层具有可疏性。采用大流量大降深放水试验,对观测孔水位单位时间内的变化曲线斜率进行研究,底板砂岩含水层疏降快,恢复慢,增加放水量可有效加快含水层水位的疏降,多孔大流量疏放水可以最大程度上激发地下水流场的变化,在一定范围内对底板砂岩含水层进行疏水降压,可以持续降低地下水水位;单孔放水和多孔放水过程中水位恢复时间分别占放水时间的77.92%和86.21%,而水位仅分别恢复了最大降深的39.11%和46.56%,说明了含水层水位易疏降,难恢复。根据对放水孔的水量和水压变化情况分析,长时间疏水降压会使水量逐渐减小,并产生大幅降深,证明底板砂岩含水层补给条件一般。结合井田地层和构造条件,提出底板砂岩含水层位于相对较为封闭的隔水空间有利于疏水降压。结果表明:利用抽水试验和放水试验资料,从含水层水位单位时间变化速率、抽水和恢复水位曲线、放水孔水压变化和含水层边界条件等方面,可以对底板厚层砂岩含水层可疏性进行综合评价。

元宝山露天矿基岩含水层可疏性和疏干方法研究

以大量的水文地质资料和抽水试验以及相邻矿井放水试验实测数据为基础，对国内外罕见的大水矿床—元宝山露天煤矿基岩含水层的可疏性进行了详细的分析、论证，同时对巷道疏干方法进行了研究。放水试验结果初步证明了元宝山露天矿基岩含水层采用巷道疏干是可行的。

基于放水试验的烧变岩含水层可疏性分析

以榆神矿区某矿火烧区放水试验为例,根据放水量、井上下水位变化幅度及水质变化情况等资料,结合烧变岩岩性、抽水试验、补径排条件等,综合分析了烧变岩含水层的可疏性。实践表明,放水试验可弥补地面抽水试验的局限性,对于查明煤矿区水文地质条件有着非常重要的意义,其结果可为矿井防治水提供合理的依据。

机器人辅助经皮椎体成形术对治疗胸腰椎压缩性骨折的临床疗效分析

目的分析机器人辅助经皮椎体成形术(PVP)对治疗骨质疏松性椎体压缩性骨折(OVCF)的临床疗效与安全性。方法2023年9月至2024年1月新疆医科大学第六附属医院脊柱外科行机器人辅助PVP的患者41例;其中男4例,女37例;BMI(23.8±4.0)kg/m^(2);年龄(70.5±9.3)岁;病椎包括T10椎体3例、T11椎体5例、T12椎体6例、L1椎体13例、L2椎体7例、L3椎体3例、L4椎体4例。观察其骨水泥灌注量、透视次数、骨水泥渗漏率、手术时间、术后住院时间及其他并发症发生情况;同时对比机器人辅助组术前、术后椎体中线高度、Cobb角、ODI评分及疼痛视觉模拟评分(VAS)。结果机器人辅助PVP骨水泥渗漏率为7.3%(3/41),手术(穿刺及骨水泥推注)(31.9±4.7)min,透视(12.1±1.3)次,术后住院(3.2±0.8)d;41例患者均未发生术后感染及并发症。术后1 d VAS(2.0±0.8)分,Cobb角(8.9°±5.2°),均低于术前[(5.0±0.9)分、(12.6°±6.2°)]。术后1 d椎体中线高度(19.8±5.2)mm高于术前(16.6±5.3)mm,差异均有统计学意义(均P<0.05)。结论机器人辅助PVP治疗胸腰椎压缩性骨折是一种可行、有效、安全的方法,可获得满意的临床疗效。

基于放水试验的宝塔山砂岩含水层水文地质条件探查

为了进一步探查宁东煤田宝塔山砂岩含水层的水文地质条件,为下组煤底板砂岩水害防控提供基础资料,采用井下放水试验计算了含水层的水文地质参数,论证了含水层的可疏性。根据宝塔山砂岩含水层单孔放水试验放水孔和1个观测孔、2个观测孔资料,利用解析法计算宝塔山砂岩含水层渗透系数平均值分别为0.301、0.219 m/d,影响半径平均值分别为691、914 m,采用图解法得到的影响半径平均值为697 m,根据3次降深放水计算的钻孔单位涌水量为0.071~0.088 L/(s·m)。通过放水试验得到的水文地质参数比抽水试验得到的参数大,宝塔山砂岩含水层水文地质特征表现为渗透性和富水性弱,且富水性不均一,水压和水温高。基于放水试验成果,结合研究区边界条件分析可知,宝塔山砂岩含水层具有较好的可疏性。

Fabrication and anti-corrosion performance of superhydrophobic silane film on sintered NdFeB

An eco-friendly superhydrophobic protective film(DTMS/TEOS silane film)was fabricated on sintered NdFeB substrate through the utilization of electrochemically assisted deposition technology.The structure,properties,and film-forming mechanism of dodecyltrime-thoxysilane(DTMS)/tetraethoxysilane(TEOS)silane films were comprehensively analyzed using Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),X-ray photoelectron spectroscopy(XPS),potentiodynamic polarization curves and electrochemical impedance spectroscopy(EIS).Based on the test results,it can be determined that this film has a superhydrophobic property with a hydrophobicity angle of 152°.This special property can be attributed to the long alkyl chains in the DTMS molecule,the rough morphology,and the low surface energy of the DTMS/TEOS silane film.The surface of sintered NdFeB is coated with a layered three-dimensional network silane film that forms through the condensation of silanol substances.This film provides excellent corrosion resistance to the sintered NdFeB substrate,reducing its corrosion current density to 2.02×10~(-6)A/cm~2.Moreover,the impact of film on the magnetic characteristics of sintered NdFeB was assessed and found to be minimal.

Microstructural, wettability, and corrosion behaviour of TiO_(2) thin film sputtered on aluminium

The study investigated the application of radiofrequency(RF)-sputtered TiO2 coatings at various temperatures to enhance the hydrophobicity and corrosion resistance of Al6061 alloy.The research aimed to establish a correlation between the coating process and the resulting surface properties.Surface roughness and wettability were quantified with a surface profilometer and goniometer.Additionally,chemical boiling and salt spray corrosion tests were conducted to evaluate any topographical changes during these procedures.The analysis further involved the use of field-emission scanning electron microscopy(FESEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD)techniques to characterize the deposited coatings.The findings indicated that the TiO2 coating applied at 500℃exhibited the highest water contact angle and superior corrosion resistance compared to other temperatures.Surface characterization confirmed that this specific TiO_(2) coating at 500℃ effectively delays corrosion due to its hydrophobic behavior,making it durable for industrial applications.

Experimental measurements of short-term adsorption of Acidithiobacillus ferrooxidans onto chalcopyrite

The influencing factors in adsorption such as adsorption time, pulp concentration, bacterial concentration, pH as well as ionic strength were investigated to explore the relationship among them and bacterial adsorption. The adsorption was a rapid process for bacterial adhesion to chalcopyrite. The extent of adsorption increased with increasing initial bacterial concentration and pulp concentration. The optimal pH for Acidithiobacillusferrooxidans adsorption onto chalcopyrite surfaces was in the range of pH 1-3. The increase of ionic strength led to decrease in bacterial adsorption, which can be well explained by electric double layer theory. The adsorption behavior appeared to be controlled by both hydrophobic and electrostatic interactions at the interface of bacteria and mineral,

基于K-L算法的投影图正则非负矩阵分解

通过对投影非负矩阵分解(PNMF)增加数据点及其邻近点的约束,提出一种基于图正则化的投影非负矩阵分解(PGNMF)方法。PGNMF保留了数据在低维特征空间中局部几何结构的同时又对系数矩阵进行稀疏约束,既减少了存储空间,也提高了算法效率。理论分析和数据实验都验证了该算法的有效性。

Preparation, friction and wear properties of hydrophobic lanthanum borate nanorods in rapeseed oil

Oleic acid (denoted as OA) surface-caped lanthanum borate nanorods, abbreviated as OA/LaBO3·H2O, were prepared via hydrothermal method. The microstructures of the as-prepared OA/LaBO3·H2O nanorods were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The friction and wear properties of OA/LaBO3·H2O nanorods in rapeseed oil were evaluated with a four-ball tribo-tester. The results show that the as-prepared OA/LaBO3·H2O nanorods are hydrophobic and display nanorods morphology with uniform diameter of about 50 nm and length of up to 500 nm. In the meantime, OA/LaBO3·H2O nanorods can obviously improve the anti-wear and friction-reducing capacities of rapeseed oil, and the optimal anti-wear and friction-reducing properties of rapeseed oil were obtained at an OA/LaBO3·H2O content of 1% (mass fraction).

临时煤仓施工防突水技术研究

鄂尔多斯母杜柴登矿临时煤仓施工期间存在2-2中煤顶板含水层突水危险,为保证临时煤仓及其附属巷道的安全施工,计算了煤仓顶板安全隔水层厚度,研究了2-2中煤顶板砂岩含水层的可疏性,研究结果表明,煤仓及其巷道顶板安全隔水层厚度和松动圈的厚度为11.62m,顶板含水层的可疏性不佳。最终决定采用降低煤仓顶板,使煤仓顶部隔水层厚度达到安全厚度。

强富水性砂岩含水层下煤仓施工防突水研究

为保证纳林河二号矿井一号煤仓及上仓斜巷的安全施工,计算了煤仓顶板安全隔水层厚度,并对煤仓上部2-1煤顶板和煤仓仓体周围地层含水层富水性进行了分析,研究结果表明,煤仓及其巷道顶板安全隔水层厚度和松动圈的厚度为14.18m,由于顶板含水层的可疏性不佳,决定采用降低煤仓顶板,使煤仓顶部隔水层厚度达到安全厚度,确保了一号煤仓及上仓斜巷的安全施工。

Comparison of Phycobiliproteins from Gracilaria lemaneiformis (Rhodophyceae) and Its Pigment Mutants in Spectral and Molecular Respects

Comparative studies of absorption spectra of phycobiliproteins of Gracilaria lemaneiformis Greville and its pigmental mutants were conducted in this study. The results showed that the absorption spectra of phycoerythrins ( PE) from different material changed significantly, while those of phycocyanins (PC) and allophycocyanins (APC) were basically similar. In order to disclose the essence of die difference, partial sequences of die subunit genes of PE of Qingdao strain of G. lemaneiformis (qd) and its pigmental mutants were determined. The amino acid sequences were deduced and used to explain spectral shifts of PE from the pigmental mutants. The amino acid sequences of PE resembled each other, and several residues changed among qd and its pigmental mutants. Residue substitutions were found in a region consisting of amino acids which determined are secondary structure and subunits interactions, thus might influence the confirmation and interaction of subunits, and further caused spectral deviation.

The Sequestered Actin Was Bound to Non-actin Protein(s) in the ATP-depleted Rabbit Proximal Tubules

Objective: To demonstrate whether the actin breakdown fromactin-cytoskele-ton in microvilli was bound to any non-actin protein ( s ) in 'ATP-depleted rabbitproximal tubules (PT). Methods: By using DTSSP to crosslink actin and non-actin protein (s) ininsoluble fraction of ATP-depleted PT, the crosslinked protein complexes were analysed bytwo-dimensional electrophoresis and western blotting. Results: Analysis of the crosslinked actincomplexes revealed one complex that contained actin and non-actin protein. Villin was not detected.Conclusion: The results strongly suggested that some of the sequestered actin was directly bound tonon-actin protein (s) other than was co-precipitated with villin or the nuclei as hydrophobic actinhomopolymers.

聚焦解决模式用于老年骨质疏松性骨折患者护理效果分析

目的探讨聚焦解决模式用于老年骨质疏松性骨折患者护理中的效果。方法选取医院2018年至2019年医院收治的老年骨质疏性骨折患者84例,以整群随机化法分为对照组和研究组,各42例。对照组患者予常规护理,研究组患者予聚焦解决模式护理。结果研究组患者生活质量评分及骨折愈合优良率显著高于对照组(P<0.05)。结论聚焦解决模式用于护理老年骨质疏松性骨折,能促进骨折恢复,提高患者的生活质量。

Study on the Edge Effect of Orthopteran Community in Ningxia Helan Mountain

[Objective] The study aimed to discuss the influences of edge effect on orthopteran community in east slope of Helan Mountain.[Method] Samples are collected by using sample zone method.The different species of orthopterans in different habitats are recorded.[Result] The percentage of Oedipodidae,Catantopidae and Pamphgidae in total are 42.65%,29.15% and 12.76% respectively.From scattered grassland interior to edge and then to desert grassland,abundance increase in turn,but diversity in the edge is the highe...

元宝山露天矿基岩含水层疏干方法研究

以大量的水文地质资料和抽水试验资料以及相邻矿井放水试验实测数据，对元宝山露天煤矿基岩含水层的可疏性及可利用巷道疏干的方法，进行了分析、论证与研究。通过放水试验，初步证明元宝山露天矿基岩含水层采用巷道疏干的方法是可行的。