Materials Literature
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본 연구를 통해서 초점면 배열 이차원 마이크로볼로미터를 위한 픽셀 단위의 신호취득 회로를 연구하였다. 높은 응답도와 긴 적분시간을 갖는 픽셀 단위의 구조를 위해 이 단계 바이어스 전류 억제 방식을 갖는 전류 미러 입력회로를 제안하였다. 제안하는 회로는 0.35-㎛ 2-poly 4-metal CMOS 공정을 이용하여 설계했고, 마이크로볼로미터의 배열 크기는 320 × 240이며 픽셀 크기는 50 ㎛ × 50 ㎛이다. 제안하는 이 단계 바이어스 전류 억제 방식은 넓은 보정 범위에서 충분히 작은 보정 오차를 보이며, 설계 파라미터를 조정하여 보정 범위와 보정 오차를 간단…
With the constant increase of oil prices and with the dwindling of fossil resources, "green" alternatives must be found. Thus, first research was conducted on the possibility to develop synthetic phenolic adhesives for wood-based panels where a part of phenol was substituted by wheat proteins. Similarly, tannins which…
La tesis doctoral se centra en la preparacion de recubrimientos protectores de UV mediante la incorporacion de moleculas altamente absorbentes de UV y altamente fotoestables en matrices sol-gel para validar su uso en diferentes tipos de materiales, en especial en aquellos con aplicaciones en el mundo de la optica y en…
利用飞秒时间分辨泵浦-探测磁光克尔光谱对掺杂不同浓度稀土元素Tb的Heusler合金Co2FeAl（0.5）Si（0.5）（CFAS）磁性薄膜的磁各向异性和超快退磁动力学进行了研究。发现较低浓度Tb掺杂的样品出现磁化进动振荡,而较高浓度Tb的样品无磁化进动振荡,最高浓度的样品只有一个零点峰,表明不同Tb浓度的样品具有不同的磁各向异性。同时,从无进动磁化动力学曲线上观察到样品的退磁过程都是两步退磁,第一步快的退磁化过程源于过渡金属（Co Fe）的3d磁矩的超快退磁化,而第二步较慢的退磁化反映的是Tb元素的4f磁矩通过3d-5d6s-4f耦合的退磁化过程。结果表明可以通过控制掺杂Tb浓度来达到调控CFAS的磁各向异性目的。这种Tb掺杂…
Abstract : In this ONR funded project investigators at the University of Delaware's Department of Electrical and Computer Engineering and Center for Composite Materials developed a new additive manufacturing process for realizing composite materials with prescribed RF properties over a broad frequency range.
초음파를 이용한 조직 자극 기법은 지속적으로 연구, 개발되고 있으며, 최근 미용 및 비만 치료에 대한 관심이 높아짐에 따라 초음파 지방 제거술에 대한 다양한 연구가 진행되고 있다. 본 연구에서는 초음파 지방 제거술을 위한 초음파 변환기를 설계하고, 조사조건에 따른 집속영역의 형태와 열 변성 영역을 시뮬레이션 하였다. 이를 통하여 제원을 검증하였으며, 제작된 변환기의 초음파 방사 특성 및 가열 특성을 측정하여 유효성을 평가하였다. 또한 복합 구조의 매질을 대상으로 초음파 가열 특성을 예측하였으며 제작된 변환기의 집속점 형태 및 가열 특성이 지방층을 충분히 유화시킬 수…
Objective : This research has been conducted to comparative analysis of anti-inflammatory effects to suggest a usefulness of ethanol extracts fromGentianae sino-ornata(GSO) as a functional material for inflammatory activities.Methods : Cell viability was measured by neutral red (NR) assay, and nitric oxide (NO) produc…
Rhodocodon species are endemic to Madagascar and their circumscription has been a topic of debate. Speta [1] treated Rhodocodon as synonymous with Rhadamanthus and Manning [2] included the species in Drimia . Knirsch et al. [3] have recently presented evidence for a separate genus, Rhodocodon . Three novel homoisoflav…
This paper describes an approach, based on composite materials, technological properties and processing technologies, Composite Materials are systems of at least two component materials, with physical properties that are not attainable by individual components acting alone in different industry. The materials used in…
Around 30-40% of the heat supplied in an internal combustion engine is rejected through the exhaust gases. So, the engine overall efficiency can be improved if this waste heat was converted to usable energy. Thermoelectric generators are solid states devices which can be used to convert thermal energy to electrical en…
The Plutonium Facility, designated PF-4, is located in Technical Area 55 at the Los Alamos National Laboratory (LANL). The facility is a one-story rectangular structure above a complete basement; the building was constructed of cast-in-place reinforced concrete, with small interior frames of structural steel. The plan…
以5-氨基-3-硝基-1, 2, 4-三唑(ANTA)和1-氨基-3, 5-二硝基-1, 2, 4-三唑(ADNT)为原料, 设计、合成了一种新型C—N互联三唑化合物1-氨基-3-硝基-5-(5-氨基-3-硝基-1, 2, 4-三唑-1-基)-1, 2, 4-三唑(DANBT), 采用IR、NMR、MS对其结构进行了表征, 用差示扫描量热法研究了DANBT的热性能, 确定了其熔点为221.8 ℃, 分解峰温为291.8 ℃, 热稳定性优于ADNT和ANTA。采用Kamlet-Jacobs方程预测DANBT的爆速与爆压分别为8.69 km·s-1, 33.91 GPa。
采用喷雾干燥法制得超细CL-20/TNT共晶炸药。采用扫描电镜(SEM)对其大小和形貌进行表征, 利用X射线衍射法(XRD)和差示扫描量热法(DSC)对其是否形成共晶进行判定, 并对其进行撞击安全性能测试与分析。结果表明, 所制得的样品不是CL-20与TNT简单的混合, 而是形成了超细CL-20/TNT共晶炸药, 粒径小于1 μm并团聚成1~10 μm的微球; 超细CL-20/TNT共晶炸药的熔点为132.32 ℃, 热分解过程分两个阶段, 第一阶段和第二阶段的分解放热峰温分别为218.98 ℃和253.15 ℃, 特性落高为49.3 cm, 比原料CL-20高36.2 cm。
采用粘度测试技术研究了聚叠氮缩水甘油醚(GAP)/六硝基六氮杂异伍兹烷(CL-20)基混合炸药药浆的流变特性、挤注工艺温度和固化过程中温度与粘度的关系。用X射线衍射仪测试工艺温度对其混合炸药中CL-20的晶型的影响。结果表明, 混合炸药药浆为假塑性流体, 80 ℃为最佳挤注工艺温度, 固化后混合炸药中的CL-20仍为e晶型。根据药浆的化学反应流变特性, 在恒温条件下采用双阿伦尼乌斯方程建立的粘度模型为ηt=447.5329exp(25.20883/T)exp[0.02922exp(7.18748/T)t]。在20, 40, 60, 80 ℃时, 该模型的理论预测粘度与实验结果吻和良好。
Covalent coupling on metallic surfaces in UHV (Ultra High Vacuum) conditions is a new method for preparing molecular structures otherwise impossible to achieve in solution (graphene nanoribbons, 2D polymers for instance). The major challenge is now to extend these reactions from metallic to insulating surfaces, for fu…
Développement de la polarisation dynamique nucléaire à haut champ magnétique pour la caractérisation des matériaux nanostructurés La spectroscopie de RMN des solides est une méthode de choix pour la caractérisation de la structure et de la dynamique à l'échelle atomique des matériaux ordonnés et désordonnés. Cependant…
A generalized criterion for classifying binary halides AX in terms of the type of chemical bond is developed. According to this criterion, a group of predominantly ionic structures is singled out among the compounds under study. The adequacy of this approach is verified using structure maps. The numerical expression o…
The molar heat capacities of dysprosium orthovanadate DyVO 4 in the range 366–1034 K have been determined by differential scanning calorimetry (DSC). Thermodynamic functions (enthalpy, entropy, and reduced Gibbs energy) of DyVO 4 have been calculated from smoothed heat capacities.
Eight new spirostanol saponins and ten new furostanol saponins, together with twenty-one known compounds including six spirostanols [1], four caffeic acid derivatives, two amides, seven flavonoids, one ligand, and benzaldehyde [2] were isolated from Solanum macaonense . All structures of compounds were determined from…
为了深入理解含Re镍基单晶高温合金高温低应力蠕变初期的蠕变行为和强化机制, 本文利用电子显微学和能谱学等方法, 从介观至原子尺度研究了DD6单晶高温合金在1100℃/140 MPa蠕变15 min后的界面位错组态、界面位错核心结构以及界面位错附近的合金元素分布情况. 结果表明蠕变初期合金中的位错密度较低, 只在局部形成位错网络, 因此蠕变初期 g 此蠕变界面形成的V形和台阶状凸起结构数量明显低于稳态蠕变初期(12 h)时的, 而且台阶状凸起结构(对应a/2<101>60°混合型位错)明显多于V形凸起结构(对应a/2<110>刃型位错, 由位错反应形成). 蠕变初期形成的特殊形状的台阶状凸起结构是由于界面位错沿 g / g ′界面运…