Materials Literature
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Background Biomaterials for corneal tissue engineering must demonstrate several critical features for potential utility in vivo, including transparency, mechanical integrity, biocompatibility and slow biodegradation. Silk film biomaterial had been characterized to meet these functional requirements. Objective This stu…
Jump frequencies of 111In/Cd tracer atoms were measured for a series of layered phases LanCoIn3n+2 using the technique of perturbed angular correlation of gamma rays (PAC). The frequencies were determined by analysis of nuclear quadrupole relaxation produced by fluctuating electric field gradients. Samples were synthe…
The method of perturbed angular correlation (PAC) was used to determine lattice locations of 111In impurity probe atoms present in extreme dilution in the intermetallic compound FeGa3. In slightly Ga-poor samples, probes were found to strongly prefer one of two inequivalent Ga-sites. In slightly Ga-rich samples at roo…
Les textiles sont des materiaux multi-echelles, comme tout materiau, mais dont les elements aux differentes echelles sont visibles a l'œil nu. De plus, ces elements sont elances : au moins une de leur dimension est negligeable devant les autres. L'entite elementaire est la fibre. Plusieurs fibres sont assemblees pour…
Based on the locality principle of insulating superlattices, we apply the method of Wu {\it et al} [Phys. Rev. Letter {\bf 101}, 087610 (2008)] to the piezoelectric strains of individual layers under fixed displacement field. For a superlattice of arbitrary stacking sequence an accurate model is acquired for predictin…
Sanitary landfill was considered to be a predominant disposal of sewage sludge, due to its mass consummation and feasibility as well as low cost. Commonly, sewage sludge was landfilled directly or solidified before landfill. However, it was very important that how to recycle the landfilled sludge to save more spaces f…
IN THIS NOTE WE PRESENT A NOVEL STABILITY ANALYSIS METHOD FOR DC TO DC SERIES RESONANT CONVERTERS WHICH RELIES ON THE PHASE PLANE TECHNIQUE. THIS METHOD GIVES MORE INSIGHT INTO THE RATIONALE BEHIND THE STABILITY CONDITIONS BECAUSE THESE ARE OBTAINED FROM GEOMETRICAL CONSIDERATIONS INSTEAD OF EIGENVALUES OF LINEAR DISC…
EN ESTE ARTICULO SE PRESENTA UN METODO DE DE-EMBEDDING PARA DETERMINAR LOS PARAMETROS DE TRASMISION S12 Y S21 DE CUALQUIER CUADRIPOLO: ACTIVO O PASIVO. EL NUEVO METODO ES IMPLEMENTADO UTILIZANDO DOS LINEAS (COPLANARES, MICROCINTA, ETC.)NO REFLECTORAS ( METODO L-L) Y UNA LINEA NO REFLECTORA Y UNA CARGA (MODELO L-M). SE…
The problem of bending of a thick orthotropic plate is considered as a three-dimensional problem of the theory ofelasticity. On the basic of the method of expansion of thesolution into the series, a three-dimensional problem isreduced to two independent two –dimensional problems.The theory of thick orthotropic plates…
It is known that the asymptotic decay $(r \to \infty)$ of the electron density $n(r)$ outside a molecule is informative about its first ionization potential I_0$. Contrary to conventional wisdom, we demonstrate that this asymptotic decay may not be the same in every direction. When the highest occupied Kohn-Sham molec…
采用层层自组装法合成了一种新型的磺丁醚-β-环糊精/Fe3O4杂化的磁性纳米复合体（SBE-β-CD/Fe3O4 MNP）.β-环糊精与1,4-丁磺酸内酯发生亲核取代反应得到磺丁醚-β-环糊精,柠檬酸进一步修饰磺丁醚-β-环糊精使其具有羧基基团,与阿拉伯胶修饰后的含有氨基的磁性纳米粒子进行脱水缩合制得SBE-β-CD/Fe3O4 MNP.运用X射线衍射（XRD）、透射电镜（TEM）、动态光散射（DLS）、红外光谱法（FTIR）和热重分析（TGA）方法进行表征,证实了Fe3O4 MNP上接枝了SBE-β-CD.根据热重分析曲线（TGA）可估算出磁性纳米粒子表面SBE-β-CD的量及每个Fe3O4磁性纳米粒子结合SBE-β-CD分子的…
The problems of surfacing by welding of deep drawing tools are analyzed in the paper. The concept of a station of surfacing by welding with robot and image analysis system is presented. An example of developed system for plasma surfacing by welding of tools, including the forced positions is shown. Automatyzacja regen…
Bu çalışmada, kuru kömür zenginleştirme yöntemlerinden biri olan tabla türü havalı ayırıcı tasarımı ve bu tasarımın Türkiye’nin farklı bölgelerinden elde edilecek kömür numunelerine uygulanabilirliği araştırılmıştır. Bu amaçla, laboratuar ölçekli tabla türü havalı ayırıcı deney düzeneği tasarlanmış ve Yeniköy linyit y…
The thermal desorption behaviors of low-ring polycyclic aromatic hydrocarbons (PAHs), naphthalene (Nap) and acenaphthene (Acp), adsorbed by activated carbon (AC) were studied by the SETSYS Evolution 16 TGA in nitrogen atmosphere. The single and multiple scan methods were combined to obtain the thermal desorption react…
In this thesis I will give a formal definition of side effects. I will do so by modifying a system for modelling program instructions and program states, Quantified Dynamic Logic, to a system called DLAf (for Dynamic Logic with Assignments as Formulas), which in contrast to QDL allows assignments in formulas and makes…
W artykule przedstawiono opracowaną metodę wraz z wynikami badań napawania mikroplazmowego kompozytowych warstw Ni-WC na półki łopatek sprężarki ze stopu tytanu. Analizowano strukturę napoin, ze szczególnym uwzględnieniem rozkładu pierwiastków dla okolicy linii wtopienia warstwy kompozytowej w podłoże oraz granicy mię…
W artykule przedstawiono badania zautomatyzowanego procesu napawania produkcyjnego i naprawczego krawędzi przedmiotów metodami TIG i PTA z materiałem dodatkowym w postaci zimnego drutu. Określono wpływ sposobu podawania drutu położenia jego końcówki względem jeziorka ciekłego metalu na stabilność procesu oraz kształt…
The present study deals with the reduction of barium sulfate (Barite) to barium sulfide by use of carbon as the reduction agent. Pellets of barite ore containing about 95% BaSO4 has been reduced under different conditions of temperature, time, ore grain size and the type and grain size of the carbon materials. Graphit…
Badania uszkodzeń uchwytów klapy dużej biernej silnika wykazały, że naprawa tych elementów wymaga opracowania warunków technologicznych napawania automatycznego plazmowego PTA oraz napawania laserowego HPDL materiałami dodatkowymi zapewnia- jącymi zwiększoną odporność na zużycie ścierne metal-metal, w stosunku do mate…
*Corresponding author: Mr. Ali Asghar Fathivand, Radiation Applications Research School, Nuclear Science and Technology Research Institute, P.O.BOX 11365-3486, Tehran, Iran. Fax: +98 21 88221219 E-mail: afathivand@aeoi.org.ir Background: In addition to gas pollutants, many chemicals and air pollutants are in the form…