Study on the block material made by hydrated silicate powder with nm - order size 應(yīng)用水化硅酸鹽納米粉體制備塊體材料
It is the ideal equipment of controlling the middle and small solid block material 是中、小固體塊狀物料控制的理想設(shè)備。
Specification of non - synchronized opening and closing multi - jaw double ropes grab for handling scrap iron or block material 異步啟閉式多顎板廢鋼塊料雙索抓斗技術(shù)條件
Carbonaceous materials for the production of aluminium - cathode block materials - determination of the expansion due to sodium penetration with application of pressure 鋁生產(chǎn)用含碳材料.陰極塊材料.壓力作用下由于鈉滲透引起的膨脹的測定
Carbonaceous materials for the production of aluminium - cathode block materials - determination of the expansion due to sodium penetration without application of pressure 鋁生產(chǎn)用碳質(zhì)材料.陰極塊材料.無壓力作用下由于鈉滲透引起的膨脹的測定
The influence of metallic mesh packing block on radar wave shielding is only dependent on packing block material ’ s surface electric resistance , independent on other factors of material . the less surface electric resistance is , the better metallic mesh ’ s shielding effect is 而且金屬網(wǎng)柵襯層對雷達(dá)波屏蔽作用的影響只與襯層材料的面電阻有關(guān),與材料其它因素?zé)o關(guān),面電阻越小,網(wǎng)柵的屏蔽效果越好。
The special structure of zippered plastic pipe zippered seep holes made a greater seepage quantity on the condition of bare pipe ( no anti - blocking material adopted at the mouth of seep holes ) . so several kinds of anti - seepage material were adopted in the experiment of this part in order to find the proper anti - seepage material ( nonwoven fabrics glued by neoprene ) and working head ( 3m ' s working herd on initial irrigation ) 由于拉鏈?zhǔn)剿芰瞎艿莫?dú)特構(gòu)造(拉鏈?zhǔn)綕B水孔口) ,裸管(滲水孔口不采用任何防堵材料)情況下滲流量很大,所以本部分試驗(yàn)采用了幾種防滲材料試驗(yàn),最后通過比較分析,找到了合適的防滲材料(氯汀膠粘無紡布)和工作水頭(初始灌水時(shí)3m工作水頭) 。
Odium silicate is used as adhesive in metal casting , fireproof material , paper board , electric welding material , crt screen ; as water purifying agent , scale remover ; as washing aid . buffer in detergent ; as sealant in oil drilling ; as ore flotation agent , slurry thinner and leakage - blocking material in mining ; as bleacher aid , mordant , sizing material , impregnating agent in textile dye & printing ; as anti - corrosion agent and insecticide in wood processing ; as basic ingredient for coatings 硅酸鈉被大量地用于制造工業(yè)作為填充劑,在金屬澆鑄中作為砂型粘結(jié)劑,版紙工業(yè)中被用作膠合劑,在耐火材料行業(yè)中用作粘結(jié)劑,在電焊條行業(yè)也用作粘結(jié)劑,在電子工業(yè)中可用作顯像管成屏的粘結(jié)劑,在水處理中用作處理劑,防結(jié)垢劑等。在合成洗滌劑行業(yè)中用作助劑,在清洗劑行業(yè)中用作清洗及防腐緩沖劑,在石油開采中用作防止井噴材料,在礦山開發(fā)中用作堵漏材料、礦石浮選劑和泥漿稀釋劑等。
In this thesis , first , reasons and factors for the stability of loose rock dams were summarized according to the field surveys and certain expert ' s experiences . then , researches on block stability problems were reviewed , and according to the relationship between grain size and incipient velocity , it is found that the block weight is in direct proportion to 6 - 9 power of incipient velocity , and 50 % increase of the velocity will result in about 40 times change of the block weight . after that , experiments were conducted in a flume , focusing on the relationship between incipient velocity and some main factors including block weight , water depth over the dam , cross - section size , block material and river bed material 本文首先根據(jù)散拋石壩損毀情況的現(xiàn)場調(diào)查資料,結(jié)合有關(guān)專家多年的整治經(jīng)驗(yàn),總結(jié)出壩體的損毀原因及影響因素;對現(xiàn)有塊體穩(wěn)定性的研究成果進(jìn)行回顧和總結(jié),并針對散拋石壩的直接損毀現(xiàn)象,結(jié)合山區(qū)河流的水流、地形特點(diǎn),利用塊體粒徑與起動流速的關(guān)系,提出塊體穩(wěn)定重量與起動流速高次方成正比的概念,流速50的增長可能導(dǎo)致塊體穩(wěn)定重量接近40倍的變化;通過二維變坡水槽試驗(yàn),研究了壩體穩(wěn)定的主要影響因素,包括塊體重量、壩頂水深、斷面尺寸、塊體材料(塊石和卵石兩種) 、護(hù)底等,結(jié)果表明對于山區(qū)河流,試圖僅僅通過增加壩體單個(gè)塊體重量或斷面尺寸來提高壩體穩(wěn)定性效果甚微;最后,根據(jù)西部地區(qū)的自然、經(jīng)濟(jì)、交通等條件,提出可以采用柔性混凝土鉸鏈體等一類整體性較好的護(hù)面層作為散拋石壩的防沖毀措施,以期取得良好的工程效果。