炸药的圆筒试验

圆筒试验是测试炸药性能的一种重要方法。本文详述了圆筒试验的装置、实验过程和实验数据的处理方法。并给出了梯恩梯等五种炸药的试验结果,并与文献值进行了比较。本实验用梯恩梯装药的结果进行了标定、验证,精度在0.5％以内,与文献值相差0.36％。     

炸药的圆筒试验

圆筒试验是测试炸药性能的一种重要方法。本文详述了圆筒试验的装置、实验过程和实验数据的处理方法。并给出了梯恩梯等五种炸药的试验结果,并与文献值进行了比较。本实验用梯恩梯装药的结果进行了标定、验证,精度在0.5%以内,与文献值相差0.36%。     

GMDH法在橡胶配方非线性建模中的应用

GMDH即自组织法，又称数据组合处理方法。将GMDH引入橡胶配方设计中，提出一种配方过程非线性建模方法，经试验检证，结果较好。     

正交设计法在醇烯催化聚合中的应用

一、前言正交设计法是利用正交表进行合理安排试验的一种数理统计方法,其特点是可在多因素作用情况下尽量减少试验次数并对数据进行科学处理而得到更为可靠的结果。本文仅就醇烯催化聚合工作中应用正交设计法的     

正交设计与塑料加工(I)

在生产实践及科学实验中,经常要进行许多试验,以获得各种变量对最终产品的影响,优选最佳工艺条件.因此,试验设计是一个致关重要的问题.它是研究如何合理地安排试验,以及对试验数据如何分析处理的一种方法.试验设计方法有多种,最常用的有简单比较法和正交设计.……     

长输管道竣工测量数据处理方法研究

为提高管道竣工测量数据处理效率,设计了一种长输管道竣工测量数据处理方法.采集了长输管道竣工测量数据,进行数据驱动预处理,设计了长输管道竣工测量数据集成监控处理平台,实现了管道竣工测量数据处理.实验结果表明,设计方法的处理时间短,处理效率高.     

《试验设计与数据处理》的实践教学改革

《试验设计与数据处理》是学习如何处理合理设计试验和正确处理数据的一门实用的课程。为了提高学生的实践能力,专门对《试验设计与数据处理》的实践教学方面进行了探索性的改革,主要包括构建互动式教学平台、研究型论文的学习、专业问题的探究、加强上机试验操作以及试卷的综合性题目等。通过实践教学改革,让学生更迅速掌握常用的试验设计和数据处理的方法去解决专业问题,了解和熟练运用先进的计算机软件更高效科学地进行试验设计和数据处理。     

IMX中添加剂组分对熔铸药柱密度影响的研究

为提高熔铸炸药药柱的密度 ,应用正交设计法对 IMX中的几种添加剂组分进行了优化试验 ,找出了影响熔铸药柱密度的主要因素和因素之间的交互作用 ,给出了该炸药的最佳组分配比 ,并用线性回归方法拟合数据与试验结果进行了对比。     

抽象网格工作流中数据集划分方法的研究

通过分析AGWL中已有的数据集划分方法,发现在涉及到数据子集相关性时,现有的研究方法仅是通过一种定性的复制数据块间部分子数据集的方法进行处理的,并没有基于数据子集相关性给出合适的划分方法.针对这一状况,提出了一种使用矩阵对数据集进行划分的方法.首先用矩阵的下标表示子数据集,矩阵值表征相对应的子数据集的相关性,然后通过对矩阵值与一个设定的阈值的比较,对矩阵进行归并处理,最终实现了一种基于数据子集相关性和灵活性的数据集划分方法.     

某测量系统直流变换器测试台的设计与实现

针对某测量系统直流变换器的性能参数要求,研究并设计相应的测试设备。介绍了手动和自动两种方法测试8台单机共56路信号的具体实现方案,给出了自动测试时数据的采集与处理算法。     

Studies on the biosynthesis of the oogoniols

In feeding experiments withAchlya heterosexualis, [3-³H] fucosterol was efficiently incorporated into oogoniols possessing an unsaturated side chain as well as those with a saturated side chain (clionasterol skeleton). [23,25-³H]-29-Hydroxyfucosterol was also efficiently incorporated into the oogoniols and its role as an intermediate in the biosynthesis was confirmed by a trapping experiment. This indicated the presence of a small pool of endogenous 29-hydroxyfucosterol in the mycelium. [23, 25-³H]-29-Oxofucosterol was also well incorporated into the oogoniols and it is probably an intermediate in the biosynthesis. It was found to be converted to 29-hydroxyfucosterol in a trapping experiment. Reduction of the C-24(28) double bond make take place after all the functional groups have been introduced, at C7, C-11 and C-15, in the tetracyclic structure.     

Assessment of the influence of paper formation on the fluorescence contribution to brightness

Paper was produced under controlled conditions with a range of resultant formation and a constant level of fluorescent dye. Brightness and CIE-Whiteness and the fluorescent contribution to brightness or whiteness were measured by directional and diffuse illuminations. Brightness, whiteness, and fluorescence variability were evaluated as the illuminated sample aperture diameter was varied from a maximum of 12.7 mm to a minimum of 6.0 mm over a broad range of paper formation. an increase in the variance of CIE-Whiteness both including and excluding fluorescence is observed as formation degrades. the variance of the fluorescent contribution also increased, but not in a manner to suggest it is independent of the whiteness including or excluding fluorescence measurements. A higher level of instrument noise prevented a similar definitive concl usion for the fluorescent contribution to directional brightness, even though similar trends were observed. an increase in variance was observed for all whiteness and brightness measurements as viewing aperture size diminished. This suggests an opportunity to understand subjective appearance as a function of viewing aperture size. © 1995 John Wiley & Sons, Inc.     

An equivalent diffusion coefficient model of the oxidation of ceramic matrix composites

A multiscale analysis method was developed to simulate the reaction-diffusion process of SiC/SiC composite structures in a coupled thermo-chemo-mechanical environment. For the diffusion process, the airflow channel was characterized by an equivalent diffusion coefficient model, which was established in this study. The corresponding calculation was developed using a numerical analysis method to obtain the gas concentration distribution in the structure. For the reaction process, an oxidation kinetics model was adopted to calculate morphological evolution of the airflow channel. The equivalent diffusion coefficient was then updated, and the reaction–diffusion coupling calculation was performed through an iterative scheme. To validate the model, an oxidation tensile test was conducted at 1200 °C. Finally, an adjustment sheet model was calculated as an example to analyze its reaction-diffusion process, proving that this method can be applied to SiC/SiC components under complex aerodynamic and temperature loads.     

Effect of Silica Surface Dopants on the Formation of Alumina/Aluminum Composites by the Directed Metal Oxidation of an Aluminum Alloy

This study focused on clarifying the effect of SiO₂ surface dopants on the formation of Al₂O₃/aluminum composites, especially on oxidation phenomena during the incubation period. The present results showed that a surface dopant decreased the incubation period of an Al-Mg-Si alloy, as well as that of an Al-Mg alloy, and that addition of an external surface dopant decreased the incubation period more effectively than did an internal alloying of silicon. A two-step oxidation process was also conducted. In the first step of the process, an aluminum alloy was oxidized without a surface dopant and cooled to room temperature during the incubation stage. In the second step, the same specimen was surface-doped with SiO₂ powder and reoxidized. The incubation time for the specimen subjected to the two-step oxidation process was the same as that for the single-step specimen oxidized with a surface dopant. The substantial decrease in the incubation period, especially for the Al-Mg alloy, is ascribed to interaction between the SiO₂ surface dopant and the MgO layer. This interaction made the MgO layer thinner and increased the number of magnesium vacancies in the MgO layer, thus providing an appropriate microstructure in the MgO layer for bulk-growth initiation.     

Urinary malondialdehyde as an indicator of lipid peroxidation in the diet and in the tissues

Although malondialdehyde (MDA) is extensively metabolized to CO₂, small amounts are nevertheless excreted in an acid-hydrolyzable form in rat urine. In this study, urinary MDA was evaluated as an indicator of lipid peroxidation in the diet and in the tissues. MDA was released from its bound form(s) in urine by acid treatment and determined as the TBA-MA derivative by HPLC. MDA excretion by the rat was found to be responsive to oral administration of the Na enol salt and to peroxidation of dietary lipids. Urinary MDA also increased in response to the increased lipid peroxidation in vivo produced by vitamin E deficiency and by administration of iron nitrilotriacetate. Chronic feeding of a diet containing cod liver oil led to increases in MDA excretion which were not completely eliminated by fasting or feeding a peroxide-free diet, indicating that there was increased lipid peroxidation in vivo. MDA excretion was not responsive to Se deficiency or CCl₄ administration. DPPD, a biologically active antioxidant, but not BHA, a non-biologically active antioxidant, prevented the increase in MDA excretion in vitamin E deficient animals. The results indicate that MDA excretion can serve as an indicator of the extent of lipid peroxidation in the diet and, under conditions which preclude a dietary effect, as an index of lipid peroxidation in vivo. Part of this research was performed in fulfillment of the requirements for the MSc degree in nutrition.     

Effect of the extrusion process on the functional characteristics and protein quality of quinua (Chenopodium quinoa, Willd)

In order to have available a human food of high nutritive value, and conscious of the protein quality of the quinua, as well as its carbohydrate, vitamin and mineral content, its behavior during the extrusion process was tested in the present study. To eliminate saponins, a simple method was developed which consisted of washing the seeds through an aluminum container, using a wooden stirrer. Seven treatments were studied: washed quinua, washed and cooked quinua, washed and expanded quinua No. 1 and No. 2, and washed and texturized quinua No. 1 and No. 2; casein was used as control. Biological evaluation trials were carried out in Holtzman rats, following the PER method. To detect the possible effects of the processed quinua on the experimental animals, hematological as well as histopathological studies of the vital organs were performed. A maximum PER of 2.43 was obtained for the texturized quinua, 2.16 for the expanded quinua, 2.6 for the cooked quinua, while the casein control yielded a PER of 3.00. The physico-chemical characteristics of the quinua flour were determined, as well as those of the expanded and texturized products. The product obtained was subjected to an organoleptic trial and it can be stated that the results obtained were satisfactory. The product can be consumed directly without major modifications and has an acceptable flavor. The nutritive value of quinua was not impaired; it compared favorably with the best diets recommended for the population, especially of those with a lower income. The results obtained in the present study suggest the possibility of increasing the nutritional value of the product, as well as its acceptability.     

Thalidomide derivatives for the treatment of neuroinflammation

The precise mechanism‐of‐action of thalidomide remains uncertain and might differ between diseases and under different clinical condition. With implications in the treatment of a variety of inflammatory and autoimmune diseases, as well as for use as an anticancer agent, alone or in combination with established therapeutics, it is clear that thalidomide and its derivatives deserve further scrutiny. In particular, thalidomide was shown to be effective in a mouse model of multiple sclerosis (MS), an autoimmune inflammatory disorder, called experimental autoimmune encephalomyelitis (EAE). Herein, we describe the synthesis and preliminary biological evaluation of new macromolecular prodrugs of thalidomide bearing an aminoalkyl group on the phthalimide ring. The effectiveness of these compounds to limit EAE was investigated, and it was shown that, at 100 mg kg^?1 thalidomide‐equivalent dose, they abrogated the clinical and pathological features of EAE.     

螺栓联结结构的有限元优化分析

应用ANSYS参数化功能,以螺纹牙根第一主应力S1为目标函数,以螺距t和牙根半径r为设计变量,对某螺栓联结结构进行有限元优化计算,得到了最优螺栓结构,并进行了应力敏感区的讨论。     

Fluidized state gelation of ceramic microspheres: Feasibility study of a continuous process and analysis of the chemical dehydration phenomena

A continuous gelation process for producing aluminum and zirconium hydroxide microparticles was conceived and tested in a lab‐scale apparatus. Fluidized state was devised as an appropriate hydrodynamic configuration to maintain the reacting sol microdrops suspended: stable non‐coalescing spherical gel particles in a size range quite below 100 μm were produced via gelation. The microspheres produced by a subsequent calcination step showed a diameter ranging between 2 μm and 20 μm. This powder, without further size classification, was an optimal product to manufacture test specimens by sintering. Measurements on the mechanical properties, such as toughness, flexural strength and hardness, classified the test bars as a very promising ceramic material. In order to enlighten the chemical drying phenomenon and devise the main governing mechanisms acting in the gelation reaction, an extremely simplified experimental system was set. A single drop of sol was deposited into a given amount of the dehydrating liquid medium and observed by an optical microscope; image analysis permitted us to identify the gel formation, the size reduction kinetics, as well as secondary phenomena.     

Blending PP with PA6 industrial wastes: Effect of the composition and the compatibilization

Blending polypropylene to recycled PA6 industrial wastes at different compositions, with and without compatibilizer PPgMA was produced in a corotating twin screw extruder where, polypropylene acts as the polymer matrix and polyamide as the dispersed phase. Several techniques were used to investigate the morphology, thermal, viscoelastic and tensile properties of these blend. Binary PP/PA6 blends showed the presence of PA6 particles dispersed in the PP continuous phase and exhibited a coarse morphology. Increasing PA6 contents in the blend increased their crystallinity and their size and improved the tensile properties at weak deformation. In addition to compatibilizer PPgMA, the morphology shows lower diameters and a decrease in size of the dispersed PA6 particles. The interfacial adhesion was also improved, as a result of the creation of an interphase that was formed by the interaction between the formed PPgPA6 copolymer in situ and both phases. This interphase induced an improvement in tensile properties. The PPgPA6 copolymer generated by the interphase was identified with DMA analysis thanks to an additional transition in loss modulus curves. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008