To identify the signal of the weak reflected wave is a key problem to detect the thickness of the coal seam by using elastic wave .

弱反射波信号识别是声波法 煤层厚度探测中的一个关键问题。

Cost-conscious customers are not exactly good for business but weak coal prices should help margins .

具有成本意识的煤炭用户不一定非常擅长经商，但 疲弱 的 煤炭价格应有助于其利润率。

Weak supervision of work safety is an important cause to the severe situation of Chinese coal mine safety it must be solved by taking some countermeasures .

摘要对安全生产监督 脆弱是造成我国 企业安全生产状况十分严峻的重要原因，必须采取相应的措施予以解决。

Approaching bolt supporting technology in big section weak friable coal roof roadway

大断面 松软破碎 煤顶巷道锚杆支护技术探讨

For weak rock with plenty of fissures such as sandstone and coal the dynamic modulus is larger than the average modulus .

含有大量裂隙的砂岩、 煤等 软弱岩石，动态模量大于平均模量；

One method utilizing comparative analysis method to restrain the strong interference and extract weak signals in transient electromagnetic field data is introduced . The application of this method in exploration of coal gob area received good effect which has wide application prospect .

介绍了用比较法进行瞬变电磁资料抑制强干扰、提取 弱信号的一种方法，该方法多次用于 煤层采空区勘探工作中，实践证明具有良好的效果，具有非常广泛的应用前景。

However the separation of coarse slime in this size range is the weak point of coal preparation technology .

而对该粒度范围内粗煤泥的分选，是现有 选煤工艺的 薄弱环节。

Firstly this paper makes an in-depth analysis for the current status of and the problems existing in coal industry in Ningxia ( ciN ) and deems ciN has a weak market competitiveness in coal industry .

本文首先对宁夏 煤炭工业的发展现状和存在的问题进行了深入的剖析，认为目前宁夏煤炭工业的市场竞争力 偏弱。

Relationship Between Argillization of Weak Intercalations in Weathered Coal Measures Strata and Shaft Rupture

煤系风化 软弱夹层泥化与井筒破裂关系探讨

However it can be inferred that the weak reducing atmosphere can accelerate the melting of the refractory minerals . ( 4 ) The fusion temperature of coal ash can be decreased by adding Mg2 + in the carrier of dolomite .

但可以推断的是， 弱还原性气氛能够加速耐熔矿物的熔解。（4）白云石中的Mg2+不仅可以降低 煤灰的熔融温度，而且相对于Ca2+其腐蚀性要小。

The result shows that although the weak layers such as coal seams No. 7 and 10 are plastic ones they differs in assemblages of roof and floor and in structural deformation .

结果表明： 7 煤层等 软弱层属于塑性层，而各煤层及顶底板岩层组合及构造变形又有较大区别。

Research of Weak Signal Extraction and Transmission Technology Based on Low Voltage Power Line in Underground Coal Mine

基于低压电力线 煤矿 井下信号提取和传输关键技术研究

The sandwich sandstone with weak interlayer such as thin coal bed together with bedding plane and joint crack can form unstable blocks which threat the engineering safety .

研究部位岩体为层状砂岩，含有 软弱夹层，其显著特点是该砂岩的岩组中含有薄 煤层，与层理、节理裂隙等的组合易形成不稳定块体，对工程安全造成危害。

During hydrothermal transformation the heated natural water or deep fluid from basement encountered the coal layer within tectonic weak zone . SO2-4 was reduced by coal organic matter and pyrite and calcite formed . Hydrothermal process may be significant to mineralization .

热液改造阶段，循环加热的天水或来自基底的流体经过处于构造 软弱带中的 煤层，SO2-4被还原，生成热液黄铁矿，同时沉淀出方解石，对于锗起到叠加富集的作用。

It is meaningful to study deeply the structure of inertinite especially fusinite and semifusinite in weak reductive coal in West China .

对 弱还原性 煤中广泛分布的惰质组组分及其分子结构特征需进行深入研究。

The Weak Point of the Village Coal Mine Surveys and It 's Strengthening Measure

乡镇 煤矿测绘 薄弱环节及强化措施

The opening stability in soft weak coal layer is important to the safe production in a mine .

软弱 煤层巷道的稳定性对煤矿正常安全生产起着重要作用。

Study on Briquette of Weak Caking Coal Fine

弱粘结性 粉 煤成型的研究

Practice of Gasification of Datong Weak Coking Coal in Ф 3.3m Two-stage Gasifier

大同 弱粘 煤用于Φ3.3m水煤气型两段炉制气的生产实践

In view of the weak caking property and high softening point of Datong coal and of the high fusinite content of each coal in the experimental charge a way of using more Datong coal in the coking charge is suggested .

根据大同 煤粘结性 弱和软化点高的特点，以及试验配煤中各种煤的丝炭质含量高的特点，提出了在炼焦配煤中多用大同煤的途径。

The processing results of the actual detecting signals indicate that the ability to identify the weak reflected wave is considerably improved and the accuracy to detect the thickness of the coal seam is increased .

结果表明：小波多尺度分析大大改善了 煤层顶板 弱反射波的识别能力，提高了 煤厚探测的精度。

The time to produce damage deformation in surrounding rock and possible loosening area are obtained by analyzing in situ measurement of displacement in soft weak coal layer .

本文通过对 软弱 煤层巷道进行位移实测及数据分析，得到了西部 某矿软弱 煤层巷道围岩变形达破坏所需的时间和可能的变形松动区域。

Problems and measures in producing gas from Datong weak coking coal with a two-stage gasifier was discussed .

介绍了采用水煤气型两段炉以大同 弱粘 煤为原料生产城市煤气过程中遇到的问题及其解决方法。

Roadway supporting of the tilted strata with weak intercalation is one of the problems in coal mines . With the increasing of mining depth this kind of roadway supporting is becoming more and more difficult .

含 软弱夹层的倾斜岩层软岩巷道支护是目前 煤矿开采面临的难题之一，随着矿井开采深度的不断增加，这类巷道的支护变得更加困难。

Therefore it is necessary to design the coal pillar dimensions according to the weak plane shear strength of the coal pillar .

因此，需要根据 煤柱 弱面的剪切强度来设计条带开采煤柱的尺寸。

Wavelet multi-resolution analysis of weak reflected wave from the interfaces of coal seam and strata

煤岩界面 弱反射波小波多分辨分析

Study on Non Linear Creep Property of Weak Layer in Slope of Open Pit Coal Mine

露天 煤矿边坡中 软弱夹层的蠕动变形特性分析

Meanwhile as their weak safety foundation and accident-prone small and medium-sized ( SM ) coal mines have became the focus of safety regulation .

同时，中小 煤矿的安全生产基础 薄弱、事故发生率高，是政府管制的重点。

According to the characteristics of our coal resources especially the badly shortage of coking coal this paper analyzes the important significance of the extension to using weak glued coal together with coal to make coke and introduces a few methods in brief .

根据我国煤炭资源特点，特别是炼焦煤的严重短缺，扩大利用 弱粘 煤配煤炼焦有其重要意义，并简单介绍几种方法。