packing ratio 中文意思是什麼
packing ratio
解釋
包裝比-
In this paper, we study an on - line version of the two - dimensional bin packing problem that is the problem of packing a list of rectangular items into a minimum number of unit - square bins in an on - line manner. an on - line algorithm called rtdh ( refined two dimensional harmonic ) is proposed and analyzed. we show that rtdh can achieve an asymptotic worst - case ratio of less than 2. 7687, which beats the best - known bound 2. 85958
目前，對該問題的研究有各種演算法，主要有harmonic和round演算法，本文針對harmonic和round演算法存在的問題，提出一種演算法rtdh （ refinedtwodimensionalharmonic ） ，做了相應的分析，並且給出了該演算法的最壞性能比是2 . 7687的證明，這個結果刷新了目前最好的結果2 . 85958 。 -
The results indicated that the dimension, shape and purity of base material could meet the functional demand of solid lubricant ; the thermal decomposition temperature of ptfe resin exceeds 400 c, but organic and inorganic packing filler added in ptfe made the water absorption rate of composite material increased, melting temperature and decomposition temperature decreased, in the meanwhile oxidative decomposition reaction was accompanied ; polar groups such as c = o, c - o - c and so on in the carbon fiber surface is advantageous to increase compatibility with other components and interlayer shearing strength ; uniform design experimental method could help to find the relationship between formula and frictional property by relatively small tests. the developing trend of each formula ' s friction coefficient could be showed by fitting curve ; the friction coefficient with no copper powder or graphite in formula was relatively big. this fact showed that copper powder and graphite should be used cooperatively ; it was found that when the ratio of copper powder to graphite by weight is 15 : 60, 30 : 30 - 40 and 60 : 15 - 30 respectively, the friction coefficient was relatively small. the degree of crystallinity of pure ptfe reached maximum by air cooling and the abrasion loss also reached maximum among three ones ; at the same time, the abrasion loss of solid lubricant sample was also the biggest among three ones ; when solid lubricant matched with 45 # steel axle or gcrl5 steel axle, lubricant transfer film could be formed on metal surface, thus direct contact between the surface of metal friction pair rings was reduced. their working life was elongated extremely ; there was mainly much graphite, a little ptff, moo3, feso4, cus and so on in lubricant transfer film
試驗結果表明：所選原料的尺寸、形狀及純度可滿足固體潤滑劑的性能要求；聚四氟乙烯樹脂熱分解溫度超過400 ，但在ptfe中加入無機填料會使復合材料吸水率提高，熔融溫度及分解溫度降低，且伴有氧化分解反應；碳纖維表面含有c = o及c - o - c等極性基團，有利於提高其與其它組分的相容性，提高層間剪切強度；均勻設計試驗方法能夠用較少的試驗次數找出配方與摩擦性能間的關系，擬合曲線基本能表示各配方的摩擦系數發展趨勢；配方中不加銅粉或不加石墨，其摩擦系數均較高，說明銅粉和石墨應該配合使用；當銅粉15份、石墨60份時，銅粉30份、石墨30 - 40份時，銅粉60 、石墨15 - 30份時，摩擦系數均具有較低值；純聚四氟乙烯樹脂在空氣冷卻時結晶度最大，磨損量也是三者中最大的；同時，固體潤滑劑試樣在空氣冷卻時的磨損量也是三者中最大的：不論是固體潤滑劑與45 #鋼軸配副或是固體潤滑劑鑲嵌入銅套后與gcr15鋼軸配副，在金屬表面均可形成潤滑轉移膜，從而減少金屬摩擦副表面間的直接接觸，大大延長其使用壽命;轉移膜中主要含有較多的石墨、少量聚四氟乙烯、 moo 。 -
An example demonstrates the feasibility of this method. we also study the design of mean selection based on the minimum loss using taguchi. g method, present the concepts of the ratio of quality loss and effective off - center. at last we explore the design of mean selection based on the maximum profit in the process of bin packing and improve the old model
應用田口的質量損失理論，我們研究了基於損失最小的過程均值設計問題，提出了質量損失率及過程有效偏移的概念；然後以裝罐過程為例，探討了基於利潤最大化的過程均值設計，並改進了原有的裝罐模型。 -
We should formulate energy - saving economic policies for the development of liquor industrial techniques as follows : to attach importance to energy - saving, environmental protection, the utilization of circular economy, bioengineering, solid distillation, storage, blending and flavoring, and the production and the determination of low - alcohol liquor ; to make limitation and elimination in lavish packing, the development of small - scale liquor enterprises, and the production and the sales of unpackaged liquor etc. ; and to strengthen governmental support and social concern on the development of liquor - making industry, to establish a unified, open, orderly and competitive liquor market, to perfect taxation policies and strengthen the taxation management, and to establish technical innovation system and increase production concentration ratio etc
在白酒產業技術發展方向制訂節能技術經濟政策，開發提高節能、環保、循環經濟應用、生物工程、固態蒸餾、貯存、勻兌調味、低度酒的生產和分析檢測等技術；限制和淘汰過度包裝、規模以下白酒企業的發展、散裝白酒的生產和銷售等；加強政府對白酒產業的發展支持和社會的關注，建立全國統一、開放、競爭、有序的白酒市場，完善稅收政策、加強稅收征管，建立技術創新體系，增強白酒行業的創新能力，提高生產的集中度等。 -
By using ec membrane material as column packing, double - distilled water as mobile phase, the retention times ( tr " ) are measured with suitable inorganic and organic compound as solutes. 3. complying with the retention times, the partition coefficient of the solute ( ka " ) and the ratio of the surface excess concentration of solute ( ) with the concentration of the parent fraction ( cab ) are calculated
利用物理改性的方法研製了乙基纖維素（ ethylcellulose ，簡稱ec ）膜材料，並將其作為高效液相色譜柱的固體填料，以高效液相色譜模擬反滲透實驗平衡條件，以水為流動相，選擇合適的無機物和有機物作為溶質，測定乙基纖維素對它們的相對保留時間及平衡分配常數k _ a 。 -
In chapter 3 we construct two approximation algorithms which applying bin packing algorithms for scheduling problems, one is ff ( first fit ) algorithm used in parallel machine scheduling problem pm / / dj = d / n which has a lower bound of asymptotic worst - case performance ratio, another problem is scheduling independent parallel tasks in parallel identical machine systems to minimize the makespan, we use strip packing method for it and give an approximation algorithm with asymptotic performance ratio no more than 1. 6
第一個演算法利用裝箱問題中的ff （ firstfit ）演算法求解極大化按期完工工件數的平行機排序問題pm d _ j = d n - u _ j ，該近似演算法具有漸近性能比下界。第二個近似演算法利用二維裝箱中strippacking問題的演算法求解以極小化makespan為目標的帶并行工件的平行機排序問題，該演算法的漸近性能比具有下界1 . 5和上界1 . 6 。 -
The influence of packing height, ratio of water to entrainer and acetic acid initial concentration to separation effect of azeotropic distillation was studied in detail. simulation calculations of general distillation and azeotropic distillation were carried out. the influence of reflux ratio, theoretical plate, feed position, feed temperature and feed concentration to distillation process were discussed
（ 3 ）與普通精餾比較，分離要求相同時，共沸精餾時所需要的理論板數要低於普通精餾所需要的理論板數，迴流比減小，可降低設備投資70萬元，塔釜加熱量減少36 % 。 -
Investigations have been made on the influence of the heating power, working pressure, stack packing ratio, and the opening of the orifice valve and the double - inlet valve on the performance of the system
以氦氣為工質，獲得了119 . 7k的脈管無負荷製冷溫度，在國內首次用熱聲機械進入低溫溫區。 -
One method about irregular shapes is approximately rectangle solution method based on regular shapes packing, the other method is to deal with the irregular shapes directly. this paper presents a new approximation optimal about the packing space based on the combination of the two methods. using this algorithm, we can improve the packing efficiency and the using ratio of material
本文針對生產實際中的下料方案問題，在原有矩形近似演算法和不規則件直接處理演算法的基礎上，探索了一種基於兩種方法相結合處理二維不規則件的近似優化方法，以提高排樣的效率和材料的利用率。
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