高瓦斯矿井底抽巷区域消突技术实践研究

为解决河南大峪沟煤业集团有限责任公司华泰煤矿工作面上隅角瓦斯浓度超限的问题,在12采区12030和12070工作面下部开展底板抽放巷、底板抽放巷穿层钻孔、并对底板抽放巷穿层钻孔进行水力冲孔卸压增透等措施。通过分析底抽巷区域消突工程可以从物理力学性质上增大二1煤层的孔隙率、透水性和润湿性。较大程度的提高了瓦斯抽采率,较好的解决了工作面和上隅角瓦斯浓度过大,为多构造突出矿井的安全高效生产提供了实践经验和理论参考。     

基于GSM的家用煤气泄漏智能预警装置设计

本文设计了一种家用煤气泄漏智能预警装置,该装置由CO检测部分、信号处理部分、语音报警部分、GSM通信部分及自动排气部分组成,能够有效地检测空气中CO浓度。当浓度超过设定安全允许浓度则启动语音报警及动排气部分,并同时通过GSM通信模块通知用户和物业,让住户及时采取有效控制措施,以预防煤气泄漏造成的灾害。     

Online Texts and Conventional Texts: Estimating,Comparing, and Reducing the Greenhouse Gas Footprint of two Tools of the Trade

Many universities are endeavoring to understand and reduce their greenhouse gas (GHG) emissions—or carbon footprints. Hard‐copy textbooks are (perhaps surprisingly) a large component of this footprint. Because they are “virtual,” electronic texts (e‐texts) are often considered environmentally superior to conventional hard‐copy texts. However, such claims lack thorough empirical validation. An effective tool for evaluating environmental impacts of products and services is lifecycle assessment (LCA). This article enumerates the steps in the lifecycles of conventional (hard copy) texts and e‐texts and it reports the potential GHG footprints of these activities. However, the actual footprint of most products and services depends on how individuals actually use them. Therefore, our second objective is to report survey results regarding actual student behaviors. Combining LCA and survey data, we estimate the GHG emissions of representative e‐texts and conventional texts; and we compare the two. This allows us to provide insight into the question, which alternative is best? Just as importantly, our analysis also identifies three levers that administrators, faculty and students can use to reduce text‐related GHG emissions.     

气相色谱法测定三聚甲醛混合浆液中各组分含量

本文介绍了用Agilent7890A气相色谱仪(TCD检测器)测定三聚甲醛溶液中HCHO、CH3OH、H2O、MEAL、HCOOCH3、DOX、C6H 6、TOX等各组分的分析方法,该方法准确度高、精密度好、分析速度快、操作简单。     

A New Methodology for the Characterisation of Natural Dyes on Museum Objects Using Gas Chromatography–Mass Spectrometry

The derivatising agent m-(trifluoromethyl)phenyltrimethylammonium hydroxide (TMTFTH) has been employed for more than a decade at the Canadian Conservation Institute (CCI) to extract natural dyes from historical textiles and other dyed substrates. The alkaline reagent breaks the bonds between the colourants and the mordant ions or functional groups of the substrate, releasing the dye compounds into the extraction solution, and derivatises polar functionalities to produce compounds that are amenable to subsequent analysis by gas chromatography–mass spectrometry (GC–MS). This approach allows for the identification of the colourants, and is also useful in determining the presence of degradation products from the dyes and substrates, non-dye marker compounds, auxiliary compounds added to the dye bath, and substances present on the object through anthropogenic use, conservation treatments, or possible pesticide contamination. This paper discusses compounds formed through the reactions of TMTFTH with flavonoid dyes (dyer’s buckthorn, old fustic, weld, red sandalwood, and brazilwood), quinone dyes (madder, Relbunium, Galium, cochineal, lac, and walnut), indigoid dyes (indigo, Tyrian purple, and indigo carmine), turmeric, marigold, lupin and several lichen species. Results from a selection of historical dyed textiles and other decorative objects analysed at the CCI are provided to illustrate applications of the methodology.     

冠心苏合丸中挥发性成分分析

报道了采用同时蒸馏-萃取法提取冠心苏合丸中的挥发性组分,测得冠心苏合丸中的挥发性组分含量为14%.利用GC-MS方法对所获得的挥发性组分进行分析,通过G1701BA化学工作站检索NIST98谱图库,并结合标准谱图库和有关文献,从其挥发性组分中确定出14种化学成分,占冠心苏合丸中挥发性组分总检出量的97.27%.用峰面积归一化法通过化学工作站数据处理系统,得出各化学成分在挥发性组分中的相对百分含量.主要挥发性组分是冰片、异冰片和苯甲酸苄酯.并采用气相色谱法对冠心苏合丸中冰片的含量进行了测定.结果,冰片浓度在1.0～5.0 mg/mL范围内与冰片对内标物的色谱峰面积比值成良好的线性关系,冰片的平均回收率为101.2%.     

毛细管气相色谱测定蜡制品中香茅油含量

以已酸乙酯作内标,正已烷为溶剂,用毛细管气相色谱法测定了蜡制品中香茅油的含量。该方法操作简便,样品只须用正已烷溶解即可测定,其检出限为0.10g·kg-1,相对标准偏差为0.01%-4.25%,回收率为91.2%-98.1%。     

伯塞活脱气体的焦耳--汤姆逊效应

本文以伯塞活脱气体为例，定量分析了焦耳——汤姆逊效应致冷（致热）的原因，导出了伯氏气体焦耳——汤姆逊效应的转换温度与压强的关系。     

Solid-phase microextraction for flavor analysis in Harari Khat (Catha edulis) stimulant

INTRODUCTIONKhat,achemicalextractedfromaplantCathaEdulis,belongingtothefamilyCelastraceae,isusedasanaturalstimulantinEastAfricaandbor-deringArabicstates.OthernamesbywhichKhatisknowninclude:Catha,qat,kat,chat,kuses-salahin,mirra,tohai,tschat,quat,africanteaandafricansalad.TheplantofCathaedulisisanevergreenfloweringtreeorlargeshrubfoundinEthiopiaandspreadwidelyinKenya,Nyasalnd(nowMalawi),Uganda,Tanganyika,Tanzania,Somalia,Djibouti,andYemen.Itattainsaheightrangingfrom3to4m(Lewis,1931…     

基于目标培养的瓦斯地质方向课程体系建设

瓦斯地质方向课程体系建设是河南理工大学培养本科层次瓦斯地质方向人才、为煤矿瓦斯治理、煤层气规模性开发提供智力支撑的保证。根据课程体系构成和特点,制定并认真执行了达成培养目标的保证措施,从加强地质基础课程、专业核心课程模块建设、增强实践教学环节、强化教师工程背景等方面开展课程体系建设。其中,针对专业培养实验实习模块建设,通过加强专业课程实验实习针对性、遴选指导教师、优化实习实验过程等环节来确保实验实习效果。经过三年多的课程体系建设,较好地实现了瓦斯地质方向的预期培养目标。