竖井工作面注浆止浆垫设计与施工

立井井筒施工突遇含水层时常采取施工止浆垫进行工作面注浆堵水。止浆垫的施工质量直接影响注浆堵水效果,是工作面打钻注浆的基础工程。以某矿大断面竖井工作面预注浆施工为实例,探讨了竖井工作面注浆止浆垫设计与施工要点。实践证明止浆垫的成功施工为后期承受工作面最大注浆压力并防止浆液向工作面跑浆、漏浆起到了非常好的控制作用,可在同类竖井工作面预注浆防水的工程中加以借鉴。     

土压平衡盾构机的同步注浆

主要介绍了土压平衡盾构机的工作原理、特点及应用,土压平衡盾构机同步注浆的作用,同步注浆的浆液材料及性能,同步注浆系统的工作原理、工作方式及维护。只有重视同步注浆的各个环节,才能提高盾构施工的安全性和施工效率。     

壁后注浆在东坪金矿三期主竖井的实践

针对东坪金矿三期主竖井渗漏水严重的实情，详述了壁后注浆方案及施工过程，并对注浆施工中若干问题的解决、注浆效果以及壁后注浆的体会作了介绍。为类似工程的处理提供了经验。     

预注浆技术在矿山井巷工程施工中的应用

矿山井巷是建立于地表层以下的施工场所,预注浆技术是矿山井巷工程的关键环节,研究预注浆技术在矿山井巷中的应用以及施工工艺流程,注意预注浆过程的事项,确保该技术有效运用于矿山井巷中,对现有的预注浆技术进行创新,推动矿产行业的发展。     

煤矿井下注浆堵漏防水技术研究

针对煤矿井下防水墙堵漏方式存在的施工量大、堵水效果差,给井下综采安全带来严重隐患的难题,提出了一种新的煤矿井下注浆堵漏防水技术,对该注浆堵漏的原理、注浆堵漏钻孔施工方案、注浆施工工艺等进行了分析,根据实际应用表明新的注浆堵漏工艺不仅能够将注浆堵漏效率提升64%以上,而且能够有效提升井下防水效果,对提升井下防水经济性和安全性具有十分重要的意义。     

超前预注浆堵水在斜井施工中的应用

结合工程实例,介绍了超前预注浆堵水在胶带斜井施工中的应用。结果表明:超前预注浆技术的应用可以明显减小斜井井筒涌水量,并能巩固井筒软弱围岩,确保施工顺利进行和施工安全。     

地面预注浆技术在潘一矿第二副井施工中的应用

淮南矿业集团公司潘一矿为大型生产老矿井,为了提高年产量,经专家研究实行可行性方案,建设第二副井工作的难度主要是新建第二副井位置距离主井、风井和副井三井较近.新建第二副井前期施工采取冻结和地面预注浆,施工前期因注浆压力过大造成主井井壁破坏,从而对改扩建矿井工广地面预注浆方案和注浆参数进行重新修改.最终第二副井地面预注浆顺利完工.     

黄石鸡冠嘴金矿混合井注浆

通过对鸡冠嘴金矿混合井“空洞”破碎段的勘察,预注浆设计,施工及井筒掘后地质编录等,总结了井筒预注浆设计与施工经验。     

壁后注浆技术在老厂铅矿深部资源主探矿竖井工程堵水施工中的应用

针对云南澜沧铅矿有限公司老厂深部资源主探矿竖井井深720~770 m段涌水量已超过6 m3/h,通过进一步分析地质勘探资料,认为随着井筒继续下掘,井筒涌水量有进一步增加的可能。从确保施工安全与施工质量方面考虑,进行注浆堵水已刻不容缓。本文分析、研究了井筒涌水的原因,提出壁后注浆堵水处理措施。认为通过壁后注浆堵水,一方面可以胶结、充填井筒内壁裂隙,有效地将井筒涌水进行封堵;另一方面,随着注浆帷幕的形成,能够有效加固井壁,提高井筒安全性。通过合理的注浆施工,能够达到有效堵水的作用,并在实际施工中得到验证。     

矿井工程施工技术中的帷幕注浆应用难点与对策分析

近年来,国内水平井施工技术水平得到了显著提升,并且日益成熟,在矿山开发工程中应用较为广泛。但是在矿山帷幕注浆等工程中应用处于起步上升期,由于帷幕注浆工程施工中存在诸多技术性要求,因此要做好相应设计和应对措施。本文以某矿井帷幕注浆工程为例,通过对水平井施工技术应用难点、帷幕注浆工程技术要求等进行深入分析,为后期类似工程的顺利进行奠定一定理论基础。     

有害作业岗位分级及放射防护效果评价

通过对稀土高科的有害作业岗位,即接触有毒物质、粉尘、噪声、高温、电磁辐射以及放射性等方面,依据国家标准及有关部颁标准进行分级和评价,以便卫生部门按不同级别有目的地进行职业危害分级管理,劳动卫生监督监测和工人健康监护,防止各种职业病的发生.     

逆变桥不对称保护电路的研究

介绍了一种新的逆变电源逆变桥的不对称保护电路。该电路利用了电路拓扑的分析方法，对逆变桥的工作状态实行瞬时式采样监控。它能准确无误地检测出逆变桥的运行状态是否正常，并使处于“三桥臂”运行的逆变电源得到迅速而有效的保护。克服了现行逆变电源采用的“斜通保护”方法所存在的采样的间接性和保护的不完全性。     

轴类工件平键槽划线工具

本文介绍的轴类工件平键槽划线工具简化了轴类工件平键槽的划线工序，避免了工件在加工机床与钳工划线平台间的搬运，方便了键槽加工时的找正工作，提高了工效     

电火花线切割工作液对硬质合金模具的腐蚀研究

借助扫描电子显微镜(SEM)、X射线能谱仪(EDX)等设备,研究电火花线切割工作液中添加剂对硬质合金的腐蚀作用,并选择出可抑制钴浸出的添加剂。结果表明,工作液中三乙醇胺添加剂对硬质合金中钴浸出有促进作用,而油酸三乙醇胺、硼砂、苯并三氮唑则有明显的抑制作用。     

Storage of features, conjunctions, and objects in visual working memory.

Working memory can be divided into separate subsystems for verbal and visual information. Although the verbal system has been well characterized, the storage capacity of visual working memory has not yet been established for simple features or for conjunctions of features. The authors demonstrate that it is possible to retain information about only 3–4 colors or orientations in visual working memory at one time. Observers are also able to retain both the color and the orientation of 3–4 objects, indicating that visual working memory stores integrated objects rather than individual features. Indeed, objects defined by a conjunction of four features can be retained in working memory just as well as single-feature objects, allowing many individual features to be retained when distributed across a small number of objects. Thus, the capacity of visual working memory must be understood in terms of integrated objects rather than individual features. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

液压比例流量控制技术在步进式加热炉上的应用

通过对步进式加热炉的工艺特点和液压比例流量控制技术的工作原理进行分析,莱钢轧钢厂在步进式加热炉上成功地应用了液压比例液量控制技术,保障了重载下活动梁的平稳运行,并解决了系统运行中易出现的故障问题。     

Do the contents of visual working memory automatically influence attentional selection during visual search?

In many theories of cognition, researchers propose that working memory and perception operate interactively. For example, in previous studies researchers have suggested that sensory inputs matching the contents of working memory will have an automatic advantage in the competition for processing resources. The authors tested this hypothesis by requiring observers to perform a visual search task while concurrently maintaining object representations in visual working memory. The hypothesis that working memory activation produces a simple but uncontrollable bias signal leads to the prediction that items matching the contents of working memory will automatically capture attention. However, no evidence for automatic attentional capture was obtained; instead, the participants avoided attending to these items. Thus, the contents of working memory can be used in a flexible manner for facilitation or inhibition of processing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The capacity of visual working memory for features and conjunctions

Short-term memory storage can be divided into separate subsystems for verbal information and visual information, and recent studies have begun to delineate the neural substrates of these working-memory systems. Although the verbal storage system has been well characterized, the storage capacity of visual working memory has not yet been established for simple, suprathreshold features or for conjunctions of features. Here we demonstrate that it is possible to retain information about only four colours or orientations in visual working memory at one time. However, it is also possible to retain both the colour and the orientation of four objects, indicating that visual working memory stores integrated objects rather than individual features. Indeed, objects defined by a conjunction of four features can be retained in working memory just as well as single-feature objects, allowing sixteen individual features to be retained when distributed across four objects. Thus, the capacity of visual working memory must be understood in terms of integrated objects rather than individual features, which places significant constraints on cognitive and neurobiological models of the temporary storage of visual information.     

1580加热炉液压系统优化设计

分析了步进梁式加热炉液压系统的工作原理及其存在的缺陷,对原液压系统进行了优化设计,优化后的液压系统不但能满足系统的工况要求,还大幅提高了系统的可靠性和稳定性。     

配制标准系列的一种简易方法

本文介绍一种简单的配制标准系列方法。采用一个小锥形瓶固定其体积，便一定浓度的工作溶液添加数次便可获得一系列标准系列。亦可采用稀释方式，通过计算其相应浓度绘制工作曲线。