32,140 research outputs found
Free-convection condensation on single horizontal pin-fin tubes
No full textPhDNew experimental data are reported for free-convection condensation of ethylene
glycol and R-113 on three-dimensional pin-fin tubes. Effects of pin geometry and tube
thermal conductivity (for copper, brass and bronze giving a mean range of 400, 120 and
80 W/m K over the range of temperature of interest) were investigated. All tests were
performed at near atmospheric pressure with downward flowing vapour at low velocity.
Heat-transfer enhancement was found to be approximately twice the corresponding
active surface area of the tubes, i.e. the surface area of the parts of the tube and pin
surface not covered by condensate retained by surface tension. For ethylene glycol, the
best performing pin-fin tube gave a heat-transfer enhancement of 5.8, about 24 %
higher than the ‘equivalent’ two-dimensional integral-fin tube (i.e. with the same finroot
diameter, longitudinal fin spacing and thickness and fin height). For R-113, the
best enhancement was 5.9, about 10 % higher than the equivalent integral-fin tube.
For both fluids tested, vapour-side, heat-transfer enhancement was found to increase
with decreasing circumferential pin spacing and increasing pin height. Circumferential
pin thickness had little effect on heat-transfer enhancement. Effects of tube thermal
conductivity were found to be more significant for ethylene glycol than R-113.
Retention angle measurements were made under static conditions (without
condensation) and were found to be larger than for equivalent integral-fin tubes. An
expression for condensate retention angle on pin-fin tubes was proposed and found to
agree with the measured retention angles to ±15%.
A semi-empirical model for condensation heat transfer on horizontal pin-fin tubes has
been developed which accounts for the combined effect of gravity and surface tension.
The model predicts the majority of available data to ±20 %
The Effect of Ozone on the Removal Effectiveness of Photocatalysis on Indoor Gaseous Biogenic Volatile Organic Compounds
No full textBuckling folds of a single layer embedded in matrix–Folding behavior revealed by numerical analysis
No full textLow-shrinkage visible-light-curable urethane-modified epoxy acrylate/SiO2 composites as dental restorative materials
No full text
The Mechenical Mechenism of Single Layer Folds
No full text褶皺之力學成因相當複雜且多種，以致許多褶皺力學問題難以進行理論解推導。挫屈形成褶皺是非常重要且基礎的力學成因之ㄧ，也吸引許多學者嘗試尋求此類問題之理論解，以解釋部份褶皺成因與描述褶皺行為。本研究延續先前許多學者假設褶皺形式為正弦波型，並提出新的岩層褶皺之振幅與側向壓縮應變之間的合理關係，可以應用以推導各種介質與岩層之材料組成之褶皺理論解。本文應用所提出之推導方法，針對依地層深度分佈之六種可能材料組合情形，成功地推導出各種材料組合情形下單層岩層褶皺之理論解。彈性介質中彈性岩層褶皺之理論解與 Currie (1962) 之理論解相同，而黏性介質中黏性岩層褶皺理論解之顯著波長，與 Biot (1961) 之推導相同。本文推導所得之理論解，可定量描述岩層側向壓縮應變與褶皺波長間之關係。
Jeng et al. (2002) 以彈簧模擬彈性介質，成功地推導出可以描述衰減振幅褶皺波形之理論解。本研究藉用相同的方法，修正Jeng et al. (2002) 之彈簧模型，推導出新的彈性衰減振幅褶皺之理論解；再推廣運用此方法，以黏性消能盤桿件、麥斯威爾黏彈性桿件分別模擬黏性介質與黏彈性介質，成功地推導出以上六種可能材料組合情形之衰減振幅褶皺波形理論解。
野外常見之褶皺形式可大致分類成三種－雙頻波、單頻波（顯著波長）以及衰減振幅波形。由連續介質與桿件模擬介質所分別推導之理論解，將之結合適可描述此野外常見之三種波形。經由數值分析之驗證，可以定量或定性地驗證本研究所推導之褶皺波形理論解與行為。
由前人相關研究至本研究為止所獲得之研究成果，可作為描述野外觀察褶皺形式以及後續研究之基礎。This research proposes a new approach towards obtaining a rational explanation of the relationship between single layer folds and lateral compression. This approach can be used to as a theoretical explanation for the composition of geologic matrix and folds. This research uses the deductive approach on six kinds of composite media by depth to achieve a successful solution of the single layer fold theory. The theoretical solution applied for the elastic layer fold is similar to Currie’s 1962, while the solution used for finding a dominant wavelength in viscous media is analogous to Biot’s theory (1961). The theorem applied in this research can quantitatively describe the relationship between layer’s fold wavelength and lateral shortening strain.
Jeng et al. (2002) discretized the elastic matrix into a spring model, successfully formulating a theory to describe the decay amplitude waveform of folds. This research uses the same technique to adjust the spring model and proposes a new theory for the explanation of the decay amplitude waveform of folds. Thus, the same method is applied for the explanation of decay amplitude waveform fold for six kinds of composite media.
Using a combination of continuous matrix and discretization analysis, we can explain the folding patterns (e.g. double frequency folding, single frequency folding and folding decay) seen on the field. The above theorem has been thoroughly tested through evaluation by mathematical analysis, thus effectively giving a quantitative and qualitative description of frequently seen trends in geologic folding.
We are convinced that the structural geology of most outdoor geologic folding trends can be explained by past studies and this research.摘要 I
Abstract II
符號表 III
目錄 IV
表目錄 VI
圖目錄 VII
第一章 導論 1
1.1 研究背景 1
1.2 研究的內容與方法 3
1.3 本文內容 3
第二章 文獻研究 9
2.1 黏性材料模式相關文獻 9
2.2 彈性材料模式相關文獻 12
2.3 黏彈性材料模式相關文獻 14
2.4 前人文獻之討論 18
第三章 褶皺理論解推導 – 振幅無衰減情形 27
3.1 岩層側向壓縮與振幅成長行為探討 28
3.2 E-E模型之褶皺理論解推導 29
3.3 V-V模型之褶皺理論解推導 32
3.4 EV-EV模型之褶皺理論解推導 34
3.5 E-EV模型之褶皺理論解推導 39
3.6 EV-V模型之褶皺理論解推導 42
3.7 E-V模型之褶皺理論解推導 44
3.8 對應原理應用之探討 46
3.9 介質對影響褶皺行為之探討 46
第四章 褶皺理論解推導 – 振幅衰減情形 51
4.1 E-E模型之衰減振幅褶皺波形理論解推導 51
4.2 V-V模型之衰減振幅褶皺波形理論解推導 54
4.3 EV-EV模型之衰減振幅褶皺波形理論解推導 58
4.4 E-EV模型之衰減振幅褶皺波形理論解推導 60
4.5 EV-V模型之衰減振幅褶皺波形理論解推導 62
4.6 E-V模型之衰減振幅褶皺波形理論解推導 64
第五章 分析褶皺力學行為 69
5.1 合理材料參數之擇定 69
5.2 分析E-E模型之褶皺力學行為 71
5.3 分析V-V模型之褶皺力學行為 74
5.4 分析EV-EV模型之褶皺力學行為 76
5.5 分析E-EV模型之褶皺力學行為 85
5.6 分析EV-V模型之褶皺力學行為 88
5.7 分析E-V模型之褶皺力學行為 92
5.8 行為分析歸納 94
第六章 褶皺行為之數值分析 109
6.1 E-E模型之褶皺行為數值分析 111
6.2 V-V模型之褶皺行為數值分析 112
6.3 EV-EV模型之褶皺行為數值分析 115
6.4 E-EV模型之褶皺行為數值分析 117
6.5 EV-V模型之褶皺行為數值分析 118
6.6 E-V模型之褶皺行為數值分析 118
6.7 岩層挫屈後之褶皺行為 119
第七章 結論與未來研究方向 159
7.1 結論 159
7.2 未來研究方向 160
參考文獻 163
附 錄 169
附錄A Airy`s 應力函數於黏性材料應用之推導 169
附錄B 半無限域黏性介質受正弦波分佈變位下之反力 175
附錄C 使用者定義材料UMAT撰寫－麥斯威爾模型黏彈性材料 179
附錄D 使用者定義材料UMAT撰寫－牛頓黏性材料 187
附錄E 推導 Biot (1961) 提出褶皺振幅與時間關係式 191
附錄F 無限介質中桿件挫屈行為推導 19
sj-docx-1-tab-10.1177_1759720X241237872 – Supplemental material for Automated osteoporosis classification and T-score prediction using hip radiographs via deep learning algorithm
No full textSupplemental material, sj-docx-1-tab-10.1177_1759720X241237872 for Automated osteoporosis classification and T-score prediction using hip radiographs via deep learning algorithm by Yu-Pin Chen, Wing P. Chan, Han-Wei Zhang, Zhi-Ren Tsai, Hsiao-Ching Peng, Shu-Wei Huang, Yeu-Chai Jang and Yi-Jie Kuo in Therapeutic Advances in Musculoskeletal Disease</p
sj-docx-2-tab-10.1177_1759720X241237872 – Supplemental material for Automated osteoporosis classification and T-score prediction using hip radiographs via deep learning algorithm
No full textSupplemental material, sj-docx-2-tab-10.1177_1759720X241237872 for Automated osteoporosis classification and T-score prediction using hip radiographs via deep learning algorithm by Yu-Pin Chen, Wing P. Chan, Han-Wei Zhang, Zhi-Ren Tsai, Hsiao-Ching Peng, Shu-Wei Huang, Yeu-Chai Jang and Yi-Jie Kuo in Therapeutic Advances in Musculoskeletal Disease</p
Scanning tunneling microscopy and spectroscopy of tip-induced direct writing of nanometallization in ultra-high vacuum
Full text linkThis thesis discusses scanning tunneling microscopy (STM) nanometallization on Si(100):H of HfB2 and MgB2. We first give an introduction to graphene nanoribbons (GNRs) along with STM and the techniques therein. We found that with STM, self-standing nanoscale features including dots, wires, and 3D structures can be made. The steps required in STM nanometallization are reduced compared with traditional lithographic techniques that involve photoresist, etching, and metal deposition.
STM nanometallization affords simple, clean, and fast metal deposition. Ti evaporation is also discussed to prevent physisorption of precursor molecules that promote unwanted and unintended effects. In addition, nanocontacts between a carbon nanotube and HfB2 and MgB2 are presented. STS results confirm that the bandgap energy of the carbon nanotube is unperturbed by nanomanipulation and nanocontacts with metallic HfB2. Finally, ongoing work is discussed and future work is proposed in the last part of this thesis.Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2022-05-01The student, Pin-Chiao Huang, accepted the attached license on 2020-05-12 at 13:44.The student, Pin-Chiao Huang, submitted this Thesis for approval on 2020-05-12 at 14:05.This Thesis was approved for publication on 2020-05-13 at 15:34.DSpace SAF Submission Ingestion Package generated from Vireo submission #15356 on 2020-08-25 at 17:31:14Made available in DSpace on 2020-08-26T23:58:48Z (GMT). No. of bitstreams: 3
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Previous issue date: 2020-05-13Embargo set by: Seth Robbins for item 115803
Lift date: 2022-08-26T23:58:55Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemAuthor requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Onl
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