圆筒织物的连续脱水开布

详细描述了Suvac Cut脱水开幅机。与离心脱水开幅机相比,叙述了这一连续工艺的优点。利用真空脱水技术,阔幅圆筒织物可在连续工艺中脱水和开幅,

电子布开纤效果的评价方法研究

讨论了电子布开纤效果的评价方法,将其归纳为布面测试法、截面测试法、透气性测试法、浸润性测试法4类。在现有评价方法的基础上,提出部分改良方法。基于图像分割的孔隙率自动测量法,将电子布正面图像通过二值化阈值处理得到黑白图像,通过计算孔隙像素点占总像素点的百分比,以孔隙率在开纤前后的变化评价开纤效果。结果表明,开纤布孔隙率的降幅达35%~58%。通过对布样截面中纱线屈曲波高的测量发现,经纬纱的屈曲波高在开纤后下降了5%~11%。通过对比树脂混合液在电子布上的接触角发现,接触角在开纤后下降了12%~27%。根据不同布种和需求,结合多种方法综合评价电子布的开纤效果,可以帮助电子布和覆铜板企业在5G时代满足对开纤布更高的要求。

开缝处理聚丙烯无纺布增强单板层积材的研究

为了提高单板层积材(LVL)的力学性能,扩大其应用领域,提高木材资源和无纺布的利用价值,采用剪切开缝处理的聚丙烯(PP)无纺布与单板复合制备层积材,通过正交试验的设计原理探究热压压力(1.0、1.2、1.4MPa)、温度(115、125、135℃)和时间(48、60、72s·mm^-1)对PP无纺布增强LVL的静曲强度(MOR)、弹性模量(MOE)和水平剪切强度(HSS)的影响,并通过傅里叶变换红外光谱仪(FTIR)、场发射扫描电子显微镜(FESEM)分析了增强型LVL的微观形态变化。结果表明:较佳的热压工艺参数组合为热压压力1.2MPa、热压温度125℃、热压时间60s·mm^-1,在此工艺参数条件下制得的开缝处理的PP无纺布LVL的MOR、MOE和HSS分别为49.77、7119.48和1.52MPa,与普通型LVL相比,分别增加了20.04%、24.15%和39.45%,与未开缝处理的PP无纺布LVL相比,分别增加了5.94%、7.80%和53.54%,剪切开缝的PP无纺布添加到单板中更有利于无纺布与单板的结合。

我国电子玻纤的生产发展及新产品开发方向

回顾我国电子玻纤的生产发展历程、历年市场发展规律与规模,并介绍了我国当前电子玻纤新产品开发方向:薄型系列电子布、低介电常数电子布、开纤电子布、混纺或混织电子布、新型后处理剂电子布。

Distribution, Development and Utilization of Bioactive Components Resources of Russian Melilotus officinalis

To confirm the content and distribution of bioactive components in roots, stems, leaves and grains of Russian Me/i/otus officina/is ＇Sligen 1 ＂, an experiment involving bioactive components detection and field planting was conducted. Kjeldahl method and high performance gas chromatography were used to detect the protein. The automatic amino acid analyzer was used to detect amino acid. Gas chromatography-mass spectrometry （GC-MS） and molecular distillation apparatus were used to confirm the fatty acid content. Gravimetric method was used to detect saponin and alkaloid contents. High performance liquid chromatography was used to detect the coumarin content. The polyphenol content was determined by forint reagent colorimetric method. Anthracene copper-sulfuric acid colorimetry was used to detect the polysaccharide, and aluminum nitrate-sodium nitrite-sodium hydroxide col- orimetric method was used to confirm flavone. The results showed that protein and amino acid were mainly distributed in leaves and seeds. The fatty acid was mainly distributed in seeds. The saponin was mainly distributed in roots and leave. The polyphenol was mainly distributed in roots, stems and leaves. The alkaloid was mainly distributed in stems, leaves and seeds. Seeds mainly contained coumarin. M. officinalis had little polysaccharide and flavone. The total production of bioactive in- gredients was 3 016.3 kg/hm2. The output of crude protein, amino acids and fatty acids was 1 400.6, 1 246.8, 112.2, respectively. The yields of effective components saponins, alkaloids, polyphenols and coumarin were 97.0, 77.9, 41.7, 40.1 kg/hm2, respectively. After separation, extraction and purification, those components can be used as the natural ingredients to develop medicine, food, chemical and other biotechnological products.

隧道渗漏水的治理

杭州某隧道工程的渗漏水情况严重,在治理过程中采取了许多方法,并取得了一定的效果,总结出一些较为合理、实用的方法。

Designing an optimal stope layout for underground mining based on a heuristic algorithm

An optimal layout or three-dimensional spatial distribution of stopes guarantees the maximum profitability over life span of an underground mining operation.Thus,stope optimization is one of the key areas in underground mine planning practice.However,the computational complexity in developing an optimal stope layout has been a reason for limited availability of the algorithms offering solution to this problem.This article shares a new and efficient heuristic algorithm that considers a three-dimensional ore body model as an input,maximizes the economic value,and satisfies the physical mining and geotechnical constraints for generating an optimal stope layout.An implementation at a copper deposit demonstrates the applicability and robustness of the algorithm.A parallel processing based modification improving the performance of the original algorithm in terms of enormous computational time saving is also presented.

Numerical simulation of overburden and surface movements for Wongawilli strip pillar mining

The Wongawilli strip pillar mining technique,which combines the strip pillar mining layout and Wongawilli mining technology,is a new high efficient mining technology for mining under surface structures. The Wongawilli strip pillar mining technique was studied in this paper using theoretical analysis and numerical simulation. As an example,the geological and mining conditions of a coal mine were used to design the Wongawilli strip pillar plans,including the support parameters of the entries and the mining technology. In order to control the surrounding rocks and manage the roof effectively during coal mining,the stress fields,displacement fields and plastic zones were studied by numerical simulation. The stress fields,displacement fields,and plastic zones generated by Wongawilli strip pillar mining were obtained. And the surface movement and deformation were also determined after mining was completed and its effects on surface structures were analyzed and evaluated. The results demonstrate that it is feasible to mine under surface structures with the Wongawilli strip pillar mining technique. This mining method can protect the surface structures from damages.

Transcatheter aortic valve implantation： a revolution in the therapy of elderly and high-risk patients with severe aortic stenosis

Transcatheter aortic valve implantation （TAV1） represents a real revolution in the field of interventional cardiology for the treatment of elderly or high-risk surgical patients with severe symptomatic aortic valve stenosis. Today, TAVI seems to play a key and a reliable role in the treatment of intermediate and maybe low-risk patients with severe aortic stenosis. TAVI has also evolved from a complex and hazardous procedure into an effective and safe therapy by the development of new generation devices. This article aims to review the background and future of TAVI, elinieal trials and registries with old and new generation TAVI devices and to focus on some open issues related to post-procedural outcomes.

Species and distribution of mountain bamboos in Shennongjia, Central China

Inventory recorded 4 genera and 11 species of mountain bamboos in Shennongjia, Central China. Of these, 4 species (Phyllostachys nigra var. henonis, Ph. heteroclada, Ph. nidularia and Ph. bambusoides) belong to the monopodial bamboo, 4 species (Indocalamus latifolius, I. longiauritus, I. wilsoni and I. tessellatus) to the amphipodial bamboo, and 3 spe-cies (Fargesia spathacea, F. murielae and Yushania confusa) to the sympodial bamboo. Monopodial bamboos grow on the gentle slopes below 1800 m asl, occurring from the subtropical belt to the temperate belt in the vertical climatic spectrum of the mountain; Sympodial bamboos occur in higher elevations, ranging from the warm temperate (1200 m), across the medi-ate temperate and cold temperate, to the mountaintops of the frigid temperate belt (3100 m). Amphipodial bamboos occur in all climate types except the frigid temperate belt. Three dominant species, F. spathacea, F. murielae and Y. confusa, currently cover 12 %, 9 % and 3 % of the mountain ranges in Shennongjia, respectively.

Research on inversion high mining pressure distribution and technology of preventing dynamic disasters by MS monitoring in longwall face

Under two rock strata combination conditions, over 10,000 microseismic events were received with microseismic location monitoring technology which possessed by the author＇s studying team, used in fully mechanized coal face of Huafeng Mine of Xinwen Coal Mining Group Co., Shandong Province. On the basis of the achievement of the location results, the conclusions were drawn as follows： On the basis of the achievement of 3D strata fracturing situation and the section plane of microseimic events in different areas, the relationship between spatial structure of overlying strata and mining pressure field was found, and we might describe distribution range of dynamic pressure of advance pressure and lateral stress around long face, and range of structure ad-tivation. Quantitative guidance to prevent dynamic disasters was provided. The practice in coal mine got a effective results. According to the FLAG3D soft numerical simulation of diameter drilling hole （the diameter is 300 mm） to relieve pressure in specified geological condition in Huafeng Mine, the right distance of two dirlls is 2.5 m and the right depth is 12 m. The research pro-vided basic guiding and practical experiences for the underground microseismic monitoring and disaster prevention in side slopes or tunnels engineering.

A Distributed Decision Mechanism for Controller Load Balancing Based on Switch Migration in SDN

Software Defined Networking(SDN) provides flexible network management by decoupling control plane from data plane. And multiple controllers are deployed to improve the scalability and reliability of the control plane, which could divide the network into several subdomains with separate controllers. However, such deployment introduces a new problem of controller load imbalance due to the dynamic traffic and the static configuration between switches and controllers. To address this issue, this paper proposes a Distribution Decision Mechanism(DDM) based on switch migration in the multiple subdomains SDN network. Firstly, through collecting network information, it constructs distributed migration decision fields based on the controller load condition. Then we choose the migrating switches according to the selection probability, and the target controllers are determined by integrating three network costs, including data collection, switch migration and controller state synchronization. Finally, we set the migrating countdown to achieve the ordered switch migration. Through verifying several evaluation indexes, results show that the proposed mechanism can achieve controller load balancing with better performance.

Molecular cloning and expression analysis of FTZ-F1 in the GIFT tilapia,Oreochromis niloticus

The FTZ-F1 genes encode orphan receptors of the nuclear receptor superfamily and in mammals have been found to play important roles in the proper development of the adrenal-gonadal axis and sex-determination.We isolated the homologue of FTZ-F1 in genetically improved farmed tilapia(gfFTZ-F1).The full-length cDNA was isolated from the ovary,which included an open reading frame encoding a predicted protein of 486 amino acids.Sequence,tissue distribution and phylogenic analysis of the FTZ-F1 showed that the gfFTZ-F1 belonged to SF-1/Ad4BP group and that gfFTZ-F1 transcripts were only expressed in the gonads and kidney but not in other tissues.Likewise our data suggests that the gfFTZ-F1 gene may share similar functions with other fish and mammalian counterparts,though further study is needed to make any definitive conclusions.

不同地层注浆加固方案与施工技术研究

通过分析致密干燥细砂、人工素填土、动水条件下全风化花岗岩等不同地层的物理力学特性及工程加固目的,提出注浆加固方案和施工技术并组织实施,达到了预期效果。总结得到:致密细砂地层通过新型钢花管注浆工艺结合水玻璃氯化钙复合注浆液,可得到较好的扩散半径和加固强度;人工素填土地层建筑物的不均匀沉降,可通过周边花管帷幕注浆结合基底开孔式布袋注浆桩,达到可靠的加固效果;动水条件下,全风化花岗岩地层采用袖阀管单管交替注入水泥水玻璃双液浆,可达到理想的加固效果。

蒸压加气块墙体免开槽布管施工技术研究应用

为能有效解决传统砌筑结构中,后期在水电管线开槽部位容易出现开裂、空鼓等质量问题,提出了蒸压加气块墙体免开槽布管施工技术。施工技术综合采用了BIM建模施工技术、加气块钻孔技术及管线布管施工技术,通过与业主和设计单位协商进行变更设计,以优化施工流程,解决传统砌筑开槽损伤墙体质量的问题,减少砌筑过程建筑粉尘、建筑垃圾的产生量,提高施工效率,提升整体的砌筑质量,同时也降低了项目施工成本。

Patterns governing distribution of surrounding-rock stress and strata behaviors of fully-mechanized caving faces

By employing numerical modeling, similar material simulation and comprehen-sive field observation, investigations were made and patterns were obtained governing surrounding-rock stress distribution and strata behaviors. It shows that patterns governing displacement of FMC roadway surrounding rocks and those governing deformation of supports are basically the same along the strike, but the displacements vary greatly. The front stresses affect greater areas than the lateral stresses and their limit widths of equilib-rium zones and K are almost similar. The stress transmits very deep. Our findings offer scientific basis on which to determine parameters for coal pillar retaining and for roadway out-laying, thus increasing the recovery ratio and improving the maintenance of roadway.

里兹并合原则的表述

本文指出了某些教材中对里兹并合原则的一种错误表述.

芯片封装技术发展对PCB基板的新需求

本文介绍了芯片封装技术的近年发展和它对PCB基板材料的多项需求以及日本、台湾等国家和地区厂商们的应对情况。

Suitable layout of gate roads related to slice mining in an ultra-thick unstable coal seam

We determi：ned a suitable gate road layout in slice mining in an ultra-thick unstable coal seam, using theoretical anallysis and numerical calculations. Based on plasticity theory in terms of limiting equilibrium, the width of chain pillar in the upper slice was calculated to be 18 m. The stress distribution in the chain pillar after the upper slice was mined out was described with numerical simulation. The extent of the effect of stress on the upper chain pillar on the lower solid coal was obtained on the basis of an elastic solution of a distributed force loaded on a half-plane. Three layout designs for lower gate roads were pro- posed and a stability factor was introduced to analyze the stability of the lower pillar with numerical calculation. Gate road translation was determined as the most suitable layout method, which maximizes the extraction rate on the basis of the pillar stability.