急求英文高手翻譯一段摘要 有關(guān)夾具設(shè)計的
-
Abstract In this paper， the general situation of research on agile fixture design is summarized and the achievements and deficiencies in the field of case-based fixture design are pointed out. There are no correlative case bases and match... Abstract In this paper， the general situation of research on agile fixture design is summarized and the achievements and deficiencies in the field of case-based fixture design are pointed out. There are no correlative case bases and matching mechanisms during the period from establishing the fixture planning to designing the fixture in currently used case-based fixture design systems. Thus a great amount of experience of fixture design is wasted and cannot be re-used， which reduces design efficiency and violates the original intention of case-based reasoning methods. In order to realize agility of fixture design， including re-configurability， re-scalability and re-usability， in this paper， a re-configurable agile fixture element base and an element assembly relation base are established. Using these two bases， the fixture structure is function-based decomposed， which makes it easy for an agile fixture to be re-configured and modified. Furthermore， a whole case-based agile fixture design model is presented， in which three modules are introduced， including the evaluation of the similarity of fixture planning， conflict arbitration and the modification of an agile fixture case. The three modules can be used to solve a problem where experience and design results cannot be re-used in the process of fixture design. Against the agile fixture design model， the evaluation method is put forward to evaluate the similarity in various phases. However， a similar case in the base could not generally meet the actual requirement and resolve the conflict between the similar case and the actual condition. Thus three methods， including a local restriction-relaxed method， a function-based conflict arbitration method and a case-based conflict arbitration method， are presented to clear up the conflict and could be used to modify the case to obtain an approach to a design result. Finally， an agile fixture design example is presented. The result demonstrates that the case-based agile fixture design approach can improve re-usability and design efficiency. Keywords: Agile fixture design; Case-based reasoning; Modeling 展開
全部評論(1條)
-
- 月殤忒忒rei 2009-05-08 00:00:00
- 摘要 摘要研究概況的基礎(chǔ)上，總結(jié)了敏捷夾具設(shè)計的成就和不足的領(lǐng)域 指出了夾具的設(shè)計實例。沒有相關(guān)的案例基地和匹配機制建立的期間 夾具設(shè)計規(guī)劃固定在目前使用的案例夾具設(shè)計系統(tǒng)。如此大量的經(jīng)驗的夾具 設(shè)計是浪費了，不能被重用，從而降低了設(shè)計效率和違反本意基于實例推理的方法。 為了實現(xiàn)敏捷的夾具設(shè)計，并在此基礎(chǔ)上，可重新安裝敏捷 夾具元件基地和元素裝配關(guān)系建立基地。利用這兩根、帶卯的座、夾具結(jié)構(gòu) 分解，從而使它容易被靈活的夾具和修改。此外，整個案例敏捷夾具設(shè)計 模型，提出了三個模塊進行了較為詳細的介紹，包括評估的相似性夾具規(guī)劃、沖突仲裁 和修改一個靈活的夾具的案例。這三個模塊也可以被用來解決問題的經(jīng)驗和設(shè)計結(jié)果不能 在這個過程中，重復(fù)夾具設(shè)計。對夾具設(shè)計模式，靈活的評價方法，提出了評價相似 在各種不同的發(fā)展階段。然而，一個類似的案件中不可能滿足實際需要，一般解決沖突 類似的情況和實際情況。這樣的三種方法，包括當?shù)豶沖突法仲裁 方法及推理的方法，給出了沖突仲裁的沖突，并可用來修改這個案件能夠獲得 方法設(shè)計的結(jié)果。Z后，一個靈活的夾具設(shè)計的例子。實驗結(jié)果表明，該案例敏捷夾具 設(shè)計方法能夠提高設(shè)計效率。 關(guān)鍵詞:敏捷夾具設(shè)計;基于實例推理、建模
-
贊(2)
回復(fù)(0)
熱門問答
- 急求英文高手翻譯一段摘要 有關(guān)夾具設(shè)計的
- Abstract In this paper， the general situation of research on agile fixture design is summarized and the achievements and deficiencies in the field of case-based fixture design are pointed out. There are no correlative case bases and match... Abstract In this paper， the general situation of research on agile fixture design is summarized and the achievements and deficiencies in the field of case-based fixture design are pointed out. There are no correlative case bases and matching mechanisms during the period from establishing the fixture planning to designing the fixture in currently used case-based fixture design systems. Thus a great amount of experience of fixture design is wasted and cannot be re-used， which reduces design efficiency and violates the original intention of case-based reasoning methods. In order to realize agility of fixture design， including re-configurability， re-scalability and re-usability， in this paper， a re-configurable agile fixture element base and an element assembly relation base are established. Using these two bases， the fixture structure is function-based decomposed， which makes it easy for an agile fixture to be re-configured and modified. Furthermore， a whole case-based agile fixture design model is presented， in which three modules are introduced， including the evaluation of the similarity of fixture planning， conflict arbitration and the modification of an agile fixture case. The three modules can be used to solve a problem where experience and design results cannot be re-used in the process of fixture design. Against the agile fixture design model， the evaluation method is put forward to evaluate the similarity in various phases. However， a similar case in the base could not generally meet the actual requirement and resolve the conflict between the similar case and the actual condition. Thus three methods， including a local restriction-relaxed method， a function-based conflict arbitration method and a case-based conflict arbitration method， are presented to clear up the conflict and could be used to modify the case to obtain an approach to a design result. Finally， an agile fixture design example is presented. The result demonstrates that the case-based agile fixture design approach can improve re-usability and design efficiency. Keywords: Agile fixture design; Case-based reasoning; Modeling 展開
2009-05-07 02:47:12
460
1
- 翻譯一段納米材料的摘要(1)
- Abstract Nanomaterials and nanotechnology have been hot issues during the recent decades. This thesis deals with the fabrication and engineering of novel nanomaterials with enhanced functionality， particularly nanocomposites and nanostruc... Abstract Nanomaterials and nanotechnology have been hot issues during the recent decades. This thesis deals with the fabrication and engineering of novel nanomaterials with enhanced functionality， particularly nanocomposites and nanostructured surfaces. The study includes two parts; in the first part， bulk transparent polymer-inorganic nanocomposites were produced by a novel synthesis method and its UV-absorption has been investigated. In the second part， nanostructured microporous surface layers， of copper， were fabricated by electrodeposition process and its effect on material’s performance for pool boiling has been investigated evaluated.In the first part of the thesis， bulk polymer-inorganic nanocomposites composed of poly(methylmethacrylate) (PMMA) and zinc compounds were prepared by an in situ sol-gel transition polymerization of zinc complex in PMMA matrix. The immiscibility of heterophases of solid organic and inorganic constituents was resolved by the in situ sol-gel transition polymerization of ZnO nanofillers within PMMA in the presence of dual functional agent， monoethanolamine， which provided strong secondary interfacial interactions for both complexing and crosslinking of constituents. Comprehensive characterization of the polymer-inorganic hybrid materials has been undertaken using a wide range of techniques; XRD， 1H NMR， FT-IR， TGA， DSC， UV-Vis， ED， SEM， TEM and HRTEM. The homogeneous PMMA-ZnO nanocomposites exhibited enhanced UV-sheltering effects in the entire UV range even at very low ZnO content of 0.02 wt%. 展開
2006-10-18 01:02:42
395
4
- 我有一段英文，看不明白，求翻譯
- Thetubewillbesupportedbypillarswhichconstrainthetubeintheverticaldirectionbutallowlongitudinalslipforthermalexpansionaswellasdampenedlateralsliptoreducetheriskposedbyeart... The tube will be supported by pillars which constrain the tube in the vertical direction but allow longitudinal slip for thermal expansion as well as dampened lateral slip to reduce the risk posed by earthquakes. In addition， the pillar to tube connection nominal position will be adjustable vertically and laterally to ensure proper alignment despite possible ground settling. These minimally constrained pillars to tube joints will also allow a smoother ride. Specially designed slip joints at each stations will be able take any tube length variance due to thermal expansion. This is an ideal location for the thermal expansion joints as the speed is much lower nearby the stations. It thus allows the tube to be smooth and welded along the high speed gliding middle section. The spacing of the Hyperloop pillars retaining the tube is critical to achieve the design objective of the tube structure. The average spacing is 100 ft (30 m)， which means there will be near 25，000 pillars supporting both tubes and solar panels. The pillars will be 20 ft (6 m) tall whenever possible but may vary in height in hilly areas or where obstacles are in the way. Also， in some key areas， the spacing will have to vary in order to pass over roads or other obstacles. Small spacing between each support reduces the deflection of the tube keeping the capsule steadier and the journey more enjoyable. In addition， reduced spacing has increased resistance to seismic loading as well as the lateral acceleration of the capsule. 有些橋墩與管道之間的細節(jié)問題希望能仔細處理清楚，十分感謝??！ 追加15分！ 能手動翻譯一下嗎？！ 展開
2013-12-03 16:23:25
293
2
- 急求幫我翻譯一段電力專業(yè)英語文章啊??！
- What's therole of the Supercapacitor? The supercapacitor resembles a regular capacitorwith the exception that it offers very high capacitance in a small package.Energy storage is by means of static charge rather than of an electro-che... What's therole of the Supercapacitor? The supercapacitor resembles a regular capacitorwith the exception that it offers very high capacitance in a small package.Energy storage is by means of static charge rather than of an electro-chemicalprocess that is inherent to the battery. Applying a voltage differential on thepositive and negative plates charges the supercapacitor. This concept issimilar to an electrical charge that builds up when walking on a carpet. Thesupercapacitor concept has been around for a number of years. Newer designsallow higher capacities in a smaller size. Whereas a regular capacitor consists ofconductive foils and a dry separator， the supercapacitor crosses into batterytechnology by using special electrodes and some electrolyte. There are threetypes of electrode materials suitable for the supercapacitor. They are: highsurface area activated carbons， metal oxide and conducting polymers. The highsurface electrode material， also called Double Layer Capacitor (DLC)， is leastcostly to manufacture and is the most common. It stores the energy in thedouble layer formed near the carbon electrode surface. 展開
2013-06-11 09:00:02
513
3
- 急求翻譯 請幫忙翻譯一下這篇英文資料，急用！?。?！
- Wells-BrookfieldCone/PlateRapidDeterminationOfAbsoluteViscosityIntroductionTheWells-BrookfieldCone/PlateViscometergivesresearchersasophisticatedinstrumentforroutinelydete... Wells-Brookfield Cone/Plate Rapid Determination Of Absolute Viscosity Introduction The Wells-Brookfield Cone/Plate Viscometer gives researchers a sophisticated instrument for routinely determining absolute viscosity of fluids in small sample volumes. Its cone and plate geometry provides the precision necessary for development of complete rheological data. Principle of Operation The Wells-Brookfield Cone/Plate Viscometer is a precise torque meter which is driven at discrete rotational speeds. The torque measuring system， which consists of a calibrated beryllium-copper spring connecting the drive mechanism to a rotating cone， senses the resistance to rotation caused by the presence of sample fluid between the cone and a stationary flat plate. The resistance to the rotation of the cone produces a torque that is proportional to the shear stress in the fluid. The amount of torque is indicated either on a dial or digital display， depending on model. This reading is easily converted to absolute centipoise units (mPa.s) from pre-calculated range charts. Alternatively， viscosity can be calculated from the known geometric constants of the cone， the rate of rotation， and the stress related torque. See Range Tables The correct relative position of cone and plate is obtained by following a simple mechanical procedure without the need for external gauges or supplementary instrumentation. The stationary plate forms the bottom of a sample cup which can be removed， filled with .5 ml to 2.0 ml of sample fluid (depending on cone in use)， and remounted without disturbing the calibration. The sample cup is jacketed and has tube fittings for connection to a constant temperature circulating bath. The system is accurate to within ?.0% of the working range. Reproducibility is to within ?.2%. Working temperature range is from 0oC to 100oC. 展開
2018-11-17 09:10:28
461
0
- 求翻譯英文文獻
- 2.2. Material Characterizations. A field emission scanning electron microscope (SEM， JEOL 6701F) was used to investigate the morphologies， particle sizes of the samples. Transmission electron microscopy and elemental compositions of the ... 2.2. Material Characterizations. A field emission scanning electron microscope (SEM， JEOL 6701F) was used to investigate the morphologies， particle sizes of the samples. Transmission electron microscopy and elemental compositions of the samples were determined by JEM-2100F (JEOL) coupled with an energy-dispersive X-ray spectroscopy (EDX， Phoenix) system. Wide-angle and low-angle X-ray powder diffraction (XRD) of the as-obtained samples were recorded on a Rigaku D/max-2500 with Cu Kα radiation (λ = 1.540 56 ?) operated at 40 kV and 200 mA. Raman measurements were performed using a DXR from Thermo Scientific with a laser wavelength of 532 nm. To calculate the pore size distribution and pore volumes， the nitrogen absorption and desorption isotherms were measured at 77.3 K with an Autosorb-1 specific surface area analyzer from Quantachrome. The content of N in N-doped porous carbon was determined by NHC elemental analysis using Flash EA 1112. Thermogravimetric (TG) analysis of S/C composite was performed on TG/DTA 6300 in an N2 flow to obtain the S content in the composite. A four-contact method was applied to measure the powder electronic conductivity of porous carbons. The powder sample was pressed to disk at 4 MPa with two stainless-steel plungers， whose resistance was measured by a Keithley 2400 digital multimeter in fourwire mode. The conductivity of the sample was calculated according to the resistance and the size of the disk. Information of the surface elements was obtained by X-ray photoelectron spectroscopy (XPS) performed on the Thermo Scientific ESCALab 250Xi using 200 W monochromatic Al Kα radiation. The 500 μm X-ray spot was used for XPS analysis. The base pressure in the analysis chamber was about 3 × 10?10 mbar. All reported data of XPS binding energy are calibrated based on the hydrocarbon C 1s line at 284.8 eV from adventitious carbon. Spectra were fitted with Lorentzian?Gaussian functions and smart background using Thermo Avantage software. 展開
2014-12-28 15:14:51
571
1
- 幫忙翻譯一段關(guān)于方酸染料合成的的英文文獻 急急急
- Synthesisofsquarainedyeswasreportedatleastin1966。Theyarederivedfromsquaricacidwhichundergoesanelectrophilicaromaticsubstitutionreactionwithananilineoranotherelectronrich... Synthesis of squaraine dyes was reported at least in 1966 。They are derived from squaric acid which undergoes an electrophilic aromatic substitution reaction with an aniline or another electron rich derivative to form a highly conjugated product with extensive charge distribution. For instance， squaraine dyes are also formed via reaction of squaric acid or its derivatives with so-called "methylene bases" like 2-methyl-indolenines， 2-metyl-benzthiazoles or 2-methyl-benzo-selenazoles. Indolenine-based squaraines combine good photostability including high quantum yields when bound to proteins and reactive versions of these dyes are commonly used as fluorescent probes and labels for biomedical applications . 展開
2011-05-20 09:09:32
331
2
- 摘要，關(guān)鍵字翻譯
- 摘要：從天然食用紫卷心菜中以水作溶劑提取紫紅色素，分別用微波和超聲波作輔助并對提取溫度、時間及次數(shù)等工藝條件進了研究。實驗結(jié)果表明，微波輔助之以水作溶劑提取天然食用紫卷心... 摘要：從天然食用紫卷心菜中以水作溶劑提取紫紅色素，分別用微波和超聲波作輔助并對提取溫度、時間及次數(shù)等工藝條件進了研究。實驗結(jié)果表明，微波輔助之以水作溶劑提取天然食用紫卷心菜中紫紅色素效果Z好，Z佳提取條件為：微波火力為80，輻射時間180秒。 關(guān)鍵字：紫卷心菜；紅色素；提??；微波；超聲波。 展開
2009-05-15 15:29:46
409
2
- 急求英譯漢高手（詞霸翻譯不加分）翻譯好了 追加50
- http://hi.baidu.com/lyl464797826/blog/item/0c12e646eca6ee3287947334.html
2010-06-19 21:53:22
518
1
- 想請有理工科背景的英文強人幫忙翻譯一段英文信件！
- The support module's APD bias has come factory set for an APD multiplication gain between 10 and 20. The APD bias monitor via the BNC connector is provided as a way to check the bias and adjust it as desired. You do not need to have... The support module's APD bias has come factory set for an APD multiplication gain between 10 and 20. The APD bias monitor via the BNC connector is provided as a way to check the bias and adjust it as desired. You do not need to have the APD bias monitored while the module is in operation， but it is good idea to double check its value at least intermittently. A simple voltmeter can be used to check the bias， and any BNC type connection and cabling should work fine. The specifications sheet has a chart showing the APD's DC current and gain versus it bias， as well as a table listing the bias at M=10 and M=20. While a current-limiter in the support module protects from damaging the APD， you must keep the APD bias below breakdown to prevent a noisy output. The SMA outputs are designed for 50-Ohm coax cabling. Since your receiver has 300 MHz output filters most cabling should work fine. Higher frequency RF or microwave rated cabling is not required. Closely matching cable length for the two outputs is required when you are terminating the two outputs differentially， otherwise when using single ended outputs ensure that both outputs are terminated similarly. In terms of the support module's ground， it should be provided through the power supply's IEC connector to a safety earth. For signal integrity the receiver's outputs should be grounded through the SMA coax cabling to whatever instrument you are using read the output， i.e. oscilloscope or counter. The ground plug is an optional ground connected directly to the outputs' SMA coax ground， but it is not required for operation. I am also attaching an electronic copy of the specifications and operations sheets if more copies of it are needed. 展開
2009-11-18 12:57:13
604
1
- 高分求高手翻譯，不要機械翻譯
- Bimetallic dendrimer-encapsulated nanoparticles(DENs)are important materials，because they have demonstrated improvement in performance compared to the monometallic DENs in many systems when they are used as catalysts.This tutorial review fo... Bimetallic dendrimer-encapsulated nanoparticles(DENs)are important materials，because they have demonstrated improvement in performance compared to the monometallic DENs in many systems when they are used as catalysts.This tutorial review focuses on the recent research advances in bimetallic DENs with respect to their synthesis，characterization，and applications as catalysts.Bimetallic DENs can be made mainly via three routes:co-complexation，sequential loading，and partial displacement.The research in bimetallic DENs has been significantly promoted by the advancement of characterization instruments.The performances of bimetallic DENs as homogeneous and heterogeneous catalysts in organic synthesis have been compared with both monometallic DENs and their physical mixtures.It is concluded that the synergistic electronic effect in bimetallic nanoparticles enhances their catalytic activities. 能翻譯多少都可以的 展開
2009-03-24 13:04:22
368
2
- 急求翻譯畢業(yè)論文
- 我是婦科專業(yè)博士，我們學(xué)校要求畢業(yè)論文寫成雙語，即要求把中文的翻譯成英文，現(xiàn)急求專業(yè)翻譯人士，請大家提供這方面信息，非常感謝... 我是婦科專業(yè)博士，我們學(xué)校要求畢業(yè)論文寫成雙語，即要求把中文的翻譯成英文，現(xiàn)急求專業(yè)翻譯人士，請大家提供這方面信息，非常感謝 展開
2018-11-26 09:40:00
306
0
- 【生物專業(yè)英語】摘要翻譯
- Abstract:Heavymetals，suchascadmium，copper，lead，chromiumandmercury，areimportantenvironmentalpollutants，particularlyinareaswithhighanthropogenicpressure.Theirpresenceinthea... Abstract: Heavy metals， such as cadmium， copper， lead， chromium and mercury， are important environmental pollutants， particularly in areas with high anthropogenic pressure. Their presence in the atmosphere， soil and water， even in traces can cause serious problems to all organisms， and heavy metal bioaccumulation in the food chain especially can be highly dangerous to human health. Heavy metals enter the human body mainly through two routes namely: inhalation and ingestion， ingestion being the main route of exposure to these elements in human population. Heavy metals intake by human populations through food chain has been reported in many countries. Soil threshold for heavy metal toxicity is an important factor affecting soil environmental capacity of heavy metal and determines heavy metal cumulative loading limits. For soil-plant system， heavy metal toxicity threshold is the highest permissible content in the soil (total or bioavailable concentration) that does not pose any phytotoxic effects or heavy metals in the edible parts of the crops does not exceed food hygiene standards. Factors affecting the thresholds of dietary toxicity of heavy metal in soil-crop system include: soil type which includes soil pH， organic matter content， clay mineral and other soil chemical and biochemical properties; and crop species or cultivars regulated by genetic basis for heavy metal transport and accumulation in plants. In addition， the interactions of soil-plant root-microbes play important roles in regulating heavy metal movement from soil to the edible parts of crops. Agronomic practices such as fertilizer and water managements as well as crop rotation system can affect bioavailability and crop accumulation of heavy metals， thus influencing the thresholds for assessing dietary toxicity of heavy metals in the food chain. This paper reviews the phytotoxic effects and bioaccumulation of heavy metals in vegetables and food crops and assesses soil heavy metal thresholds for potential dietary toxicity. 用翻譯軟件的免回，哥也有，真誠求助高手！ 展開
2010-12-13 19:23:10
631
1
- 幫忙翻譯論文摘要
- 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究... 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究得了飛速發(fā)展。本次的實驗是在前人設(shè)計的帶螺旋折流片（下簡稱螺旋片）換熱器的基礎(chǔ)上再在內(nèi)圓管多加上擾流柱，分析不同操作參數(shù)和結(jié)構(gòu)參數(shù)條件下流體傳熱情況，由此得出影響換熱器傳熱性能的條件，為進一步研究靜態(tài)混合器傳熱情況和其在實際工程及設(shè)計中的應(yīng)用奠定基礎(chǔ)。 本文對換熱器進行了研究，測得殼程空氣進出口溫度，利用溫差傳熱，以努塞爾準數(shù)作為衡量換熱器傳熱性能的標準，分別考察了雷諾數(shù)對努塞爾準數(shù)的影響，并與空管進行了比較。換熱器器中由于擾流柱的作用，使進入管中的流體在流經(jīng)擾流柱時產(chǎn)生旋渦，有效地消除了徑向主流道的速度梯度和溫度梯度。因傳熱邊界層大大減薄，使得邊界層內(nèi)流體不斷得到更新，熱阻下降，傳熱過程得到強化。 通過實驗可以得出一些結(jié)論: 由于有螺旋片同擾流柱的存在使得擾動螺旋型換熱器的傳熱效果明顯要優(yōu)于圓滑管型換熱器同螺旋型換熱器;螺旋片使流體具有向外甩開的離心力，流體在流過擾流柱時因被分流、切割、再生，不僅加速了流速并且在柱后形成渦流，加速壁面流體的更新，減薄粘性邊界層底層的厚度，從而提高了傳熱性能; 同一模型在不同Re下，隨著Re的增加，Nu也隨著增加，在不計阻力時，模型的傳熱效果隨著Re的增加而提高 不要在線翻譯的。希望幫一忙！ 如果好再加100分，我現(xiàn)在非常急，馬上就要交了。 展開
2018-11-16 22:06:50
432
0
- 幫忙翻譯論文摘要
- 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究... 換熱器是化工、煉油、動力、食品、輕工等許多工業(yè)部門廣泛應(yīng)用的一種通用設(shè)備。其性能的好壞直接影響過程工業(yè)熱經(jīng)濟性的高低。近年來，由于能源危機，強化傳熱技術(shù)和新型換熱器的研究得了飛速發(fā)展。本次的實驗是在前人設(shè)計的帶螺旋折流片（下簡稱螺旋片）換熱器的基礎(chǔ)上再在內(nèi)圓管多加上擾流柱，分析不同操作參數(shù)和結(jié)構(gòu)參數(shù)條件下流體傳熱情況，由此得出影響換熱器傳熱性能的條件，為進一步研究靜態(tài)混合器傳熱情況和其在實際工程及設(shè)計中的應(yīng)用奠定基礎(chǔ)。 本文對換熱器進行了研究，測得殼程空氣進出口溫度，利用溫差傳熱，以努塞爾準數(shù)作為衡量換熱器傳熱性能的標準，分別考察了雷諾數(shù)對努塞爾準數(shù)的影響，并與空管進行了比較。換熱器器中由于擾流柱的作用，使進入管中的流體在流經(jīng)擾流柱時產(chǎn)生旋渦，有效地消除了徑向主流道的速度梯度和溫度梯度。因傳熱邊界層大大減薄，使得邊界層內(nèi)流體不斷得到更新，熱阻下降，傳熱過程得到強化。 通過實驗可以得出一些結(jié)論: 由于有螺旋片同擾流柱的存在使得擾動螺旋型換熱器的傳熱效果明顯要優(yōu)于圓滑管型換熱器同螺旋型換熱器;螺旋片使流體具有向外甩開的離心力，流體在流過擾流柱時因被分流、切割、再生，不僅加速了流速并且在柱后形成渦流，加速壁面流體的更新，減薄粘性邊界層底層的厚度，從而提高了傳熱性能; 同一模型在不同Re下，隨著Re的增加，Nu也隨著增加，在不計阻力時，模型的傳熱效果隨著Re的增加而提高 不要翻譯軟件翻譯的。如果好再加分 展開
2018-11-25 12:54:46
431
0
- 翻譯納米材料摘要（2）
- Moreover， the particle size of incorporated ZnO calculated from the effective mass model was close to the results obtained from HRTEM. The synthesis method developed in course of this work can be used for the fabrication of different polym... Moreover， the particle size of incorporated ZnO calculated from the effective mass model was close to the results obtained from HRTEM. The synthesis method developed in course of this work can be used for the fabrication of different polymer-inorganic transparent nanocomposites with other functionalities. In the second part of the thesis， we studied a method for the fabrication of micro-porous surface layer – made of copper nanoparticles – on the surface of copper plates (suitable for heat exchangers). The micro-porous surfaces were formed from dendritic network of copper nanoparticles obtained by electrodeposition from solution using dynamic bubble formation and removal as template. The surface layer engineered and its structures were optimized in order to enhance the boiling heat transfer coefficient. To further optimize the dendritic structure， additional annealing step was introduce and its effect on the surface layer structure and properties were investigated. The properties of the deposited surface structures were investigated and its effect on the enhancement of the heart transfer coefficient has been studied. The fabricated enhanced surface has shown an excellent performance in nucleate boiling. Pool boiling tests were performed on refrigerant fluids (R134a) to evaluate the boiling performance of the electrodeposited nanostructured micro-porous structures. At heat flux of 1 W/cm2， the heat transfer coefficient is enhanced over 15 times compared to a plain reference surface. A model has been presented to explain the enhancement based on the structure characteristics. 展開
2006-10-18 01:46:56
415
4
- 英語高手幫忙翻譯段英文 謝謝??！
- In this paper， the degradation of an azo dye Orange G (OG) on nitrogen-doped TiO2 photocatalysts has been investigated under visible light and sunlight irradiation. Under visible light irradiation， the doped TiO2 nanocatalysts demonstrated ... In this paper， the degradation of an azo dye Orange G (OG) on nitrogen-doped TiO2 photocatalysts has been investigated under visible light and sunlight irradiation. Under visible light irradiation， the doped TiO2 nanocatalysts demonstrated higher activity than the commercial Dugussa P25 TiO2， allowing more ef?cient utilization of solar light， while under sunlight， P25 showed higher photocatalytic activity. According to the X-ray diffraction (XRD)， X-ray photoelectron spectroscopy (XPS) and UV–vis spectra analyses， it was found that both the nanosized anatase structure and the appearance of new absorption band in the visible region caused by nitrogen doping were responsible for the signi?cant enhancement of OG degradation under visible light. In addition， the photosensitized oxidation mechanism originated from OG itself was also considered contributing to the higher visible-light-induced degradation ef?ciency. The effect of the initial pH of the solution and the dosage of hydrogen peroxide under different light sources was also investigated. Under visible light and sunlight， the optimal solution pH was both 2.0， while the optimal dosage of H2O2 was 5.0 and 15.0 mmol/l， respectively. Azodyes， which are characterized by the presence of one or more azo bonds ( N N )， are among the most notorious widespread environmental pollutants associated with textile，cosmetic， food colorants， printing， and pharmaceutical indus-tries. Because of their non-degradability， toxicity， potential mutagenicity and carcinogenicity， wastewaters originating from these dyes production or application industries pose a major threat to the surrounding ecosystems and human beings’ health.[1–3].Environmental concerns and the need of meeting the strin-gent international standards for rejecting wastewaters has made the development of novel and cost-effective processes for the puri?cation of azo dyes ef?uents an issue of major technological importance. 展開
2011-05-06 19:00:45
584
2
- 英文高手幫忙翻譯一下 壓力容器方面
- 公司接到一個壓力容器圖紙是英文版的想知道其中的一些意思，原文如下：一TECHNICALDATA:1.MAXIMUMALLOWABLEPRESSURE7.0BAR2.WORKINGPRESSURE5.5+/-1.0BAR3.TESTPRESSURE10.0BAR4.MAXI... 公司接到一個壓力容器圖紙 是英文版的 想知道其中的一些意思，原文如下： 一 TECHNICAL DATA: 1.MAXIMUM ALLOWABLE PRESSURE 7.0BAR 2.WORKING PRESSURE 5.5+/-1.0BAR 3.TEST PRESSURE 10.0BAR 4.MAXIMUM ALLOWABLE TEMPERATURE 70℃ 5.MINIMUM ALLOWABLE TEMPERATURE 0℃ 6.FLUID PREFILL（ISO VG46-HLP） 7.CORROSION ALLOWABLE 2mm 8.VOLUME 38.00L 二 TECHNICAL ACCEPTANCE: 1.CHINA DECLARATION OF CONFORMITY 2.CONFORITY ASSESSMENT PROCEDURE REPORTS 3.BILL OF MATERIALS 4.INSPECTION DOCUMENTS AND CERTIFICATES FOR USED MATERIALS 5.WELDING MAP 6.LIST OF WELDERS AND THEIR QUALIFICATION CERTIFICATES 7.NDE EXAMINATION REPORTS 8.VT AND MEASUREMENT REPORTS 9.PAINT: EXTERNAL:BLUE RAL 5015 SEMI-GLOSS FINISH INTERNAL:USE SUNCORITE 528 BY HENKEL METAL CHEMICALS TO TREAT INTERNAL SURFACE OF TANK 10.PAINT REPORT 11.TECHNICAL DOCUMENTATION AND OPERAING MANUAL 三 NOTES: 1.ALL DIMENSIONS ARE IN MILLIMETER UNLESS OTHERWISE NOTED. 2.GASKET CONTACK SURFACE OF ALL FLANGES SHALL BE FINISHED WITH 125-250 AARH. 3.INTERNAL WELD SURFACE OF INSTRUMENT NOZZLE TO BE FULLY FLUSHED. 4.PAINT INSIADE AND OUT PER OILGEAR STANDAR SOP-U-002. 5.TATAL WEIGHT OF UNIT ASSEMBLY IS 32，900LB[14，900kg]. 6.DIMENSIONS IN MM. 展開
2010-07-15 11:42:12
1129
6
4月突出貢獻榜
推薦主頁
最新話題
滬公網(wǎng)安備 31011502008050號
參與評論
登錄后參與評論