FTIR研究红外光曝露对于高血糖大鼠的影响

研究红外场曝露对于高血糖疾病模型大鼠的影响.主要利用红外场曝露高血糖大鼠30天,然后通过考查红外场曝露对于高血糖大鼠血液组织红外光谱特征的影响来研究红外线曝露对于大鼠血糖水平产生的影响,研究结果认为红外场曝露有助于高血糖大鼠血糖水平的恢复,并进一步通过红外光谱数据的二阶导数谱的分析探讨了红外场曝露对于大鼠血糖水平产生影响的机理.     

元素俘获测井在库车深层致密砂岩中的应用

库车前陆盆地深层砂岩气藏表现为低孔隙度特低渗透率特征,由于钻井取心少,评价复杂岩性储层存在困难。元素俘获测井(ECS)利用矿物成分获取地层岩性和骨架参数,能够指导评价复杂岩性地层。利用元素俘获测井获取的元素干重百分比,建立反演矿物模型求取矿物的含量。用ECS测井资料获得的矿物含量计算地层变骨架密度(地层骨架密度随深度变化而变化),再计算地层孔隙度,其孔隙度结果与岩心孔隙度基本吻合,验证了ECS测井技术求取地层孔隙度方法的可靠性。对库车前陆盆地深层7口井已知数据的验证,提高了地层孔隙度的解释精度。实践表明,ECS测井技术用于求取塔里木盆地库车深层致密砂岩地层中的储层参数,取得了很好的应用效果。     

Potential of fluorescence spectroscopy in detection of low-levels of gluten in flour: A preliminary study

Celiac disease is caused due to the ingestion of gluten containing food products. Eating gluten free diet is only way to avoid its occurrence. Gluten free products may get contaminated during the handling and processing operation which leads to the adverse impact on the gluten intolerant patients. Three different gluten free mixes were adulterated with two different types of wheat flours to get the gluten concentration in the range of 0–5 % by making 94 sample combinations. The obtained fluorescence spectra from these samples were transformed using multiplicative scatter correction (MSC) pre-processing to develop partial least square regression (PLSR) model for the prediction of low-levels of gluten. The obtained results showed a high value of 0.90 correlation coefficient (R²) with 0.46 % root mean square error of cross-validation (RMSECV). The calibration and prediction models also showed the same R² with root mean square error of calibration (RMSEC) and prediction (RMSEP) of 0.41 % and 0.46 % respectively. Hence fluorescence spectroscopy can be used to estimate the level of adulteration which is helpful for developing a sensor for determination of low-levels of gluten as a rapid and non-invasive method in food applications.     

Polyalkylthiophene thin films and their characterisation with transmission spectroscopy

Polyalkylthiophene thin films have been prepared to enable the characterisation of the films with transmission spectroscopy and profilometry for the first time. The optical properties of the films as a function of annealing temperature are discussed. The changes in absorption with time are related to thermochromism.     

Simulation Techniques for the Manufacturing Test of MCMs

Simulation techniques used in the Manufacturing Test SIMulator(MTSIM) are described. MTSIM is a Concurrent Engineering tool used tosimulate the manufacturing test andrepair aspects of boards and MCMs from design concept through manufacturing release. MTSIM helps designers select assemblyprocess, specify Design For Test (DFT) features, select board testcoverage, specify ASIC defect level goals, establish productfeasibility, and predict manufacturing quality and cost goals. A newyield model for boards and MCMs which accounts for theclustering of solder defects is introduced and used topredict the yield at each test step. In addition, MTSIMestimates the average number of defects per board detected at eachtest step, and estimates costs incurred in test execution, faultisolation and repair. MTSIM models were validated withhigh performance assemblies at Hewlett-Packard (HP).     

Efficiency and degradation of a copper indium diselenide photovoltaic module and yearly output at a sunny site in Jordan

The present work mainly deals with the testing and modeling of a commercially-available copper indium diselenide (CIS) ST40 module from the former Siemens Solar Industries (SSI). For this purpose, a large quantity of current/voltage characteristics were measured in the Paul Scherrer Institute (PSI)’s photovoltaic test-facility under different cell temperatures, solar irradiation and air mass, AM, conditions. They were used to develop a semi-empirical efficiency model to correlate all measured data sets. The goal was to make available a model, allowing quick and accurate calculation of the performance of the CIS module under all relevant operating conditions.

For the undegraded state of the module, the efficiency model allowed us to deduce the efficiency at Standard Test Conditions, STC, and its temperature coefficient at STC, which were 11.58% and minus 0.050%/°C, respectively. The output of the undegraded module under STC was found to be 42.4 W, i.e., 6% higher than specified by the manufacturer (40 W). Furthermore, the efficiency does not decrease with increasing air mass. At a cell temperature of 25 °C and a relative air mass of 1.5, the module has a maximum in efficiency of 12.0% at an irradiance of about 650 W/m². This indicates that the series-resistance losses become significant at higher irradiances. Hence, improving the transparent conducting oxide (TCO) electrode on the front side of the cells might lead to a higher output at high irradiances.

Identical testing and modeling were repeated after having exposed the module to real weather conditions for one year. We found that the STC efficiency was reduced by 9.0%, from 11.58 down to 10.54%. The temperature coefficient of the efficiency had changed from minus 0.050 %/°C to minus 0.039%/°C. These results indicate possible chemical changes in the semiconductor film. The output of the module at STC was reduced by 9.0% from 42.4 W down to 38.6 W.

Using meteorological data from a sunny site in the South of Jordan (Al Qauwairah) and the efficiency model presented here allows us to predict the yearly electricity yield of the CIS module in that area. Prior to degradation, the yield was found to be 362 kWh/m² for the Sun-tracked module; and 265 kWh/m² for the fix-installed module (South-oriented, at an inclination angle of 30°). After degradation the corresponding yields were found to be 334 and 241 kWh/m²; meaning losses of 8.4% and 9.5%, respectively. (Note: all units of energy, kWh, are referred to the active cell area.) Having available efficiency models for other module types, similar predictions of the yield can be made, facilitating the comparisons of the yearly yields of different module types at the same site. This in turn allows selecting the best module type for a particular site.     

论煮茧实务中的几个问题

本文针支目前我国煮茧实务中存在的主要问题，参考日本对煮熟度与绪丝量、丝量的关系，影响清洁成绩的大环类，裂丝的发生数与茧吐水量、膨化率的关系的研究结果，提出了解决问题的有效方法。     

Chemical composition of melia volkensii gurke: An unrealised browse potential for semi-arid agroforestry systems

Results of chemical analyses of some nutritional characteristics of Melia volkensii browse, important for large wild and domestic herbivores in East Africa, are presented. Seeds, fruit pulp, leaves and twigs had high levels of crude protein, crude fat, minerals and fibre. Newly coppiced shoots (leaves and twigs), old shoots, fruit pulp and seed contained 230, 190, 130 and 320 g kg^-1 dry weight crude protein, respectively. The essential amino acid profile compared well with the FAO scoring pattern. Tyrosine was the first limiting amino acid in the coppice leaves and twigs, lysine in the cotyledons, and threonine and lysine in the endosperm. The concentrations of crude fat in the seed, fruit pulp, coppice shoots and old shoots were 480, 100, 80 and 50 g kg^-1, respectively. The fatty acids in the cotyledon and endosperm were mainly palmitic (110 and 109 g kg^-1, respectively), oleic (327 and 252 g kg^-1, respectively) and linoleic (487 and 573 g kg^-1, respectively). The levels of P, Na, K, Ca, Mg and the Ca/P ratio per kg dry weight were on average higher than the optimum recommended for ruminants. These results demonstrate that M volkensii browse, especially coppice leaves and twigs, have a high index for nutrient content, and the planting of this species should be promoted in the semi-arid areas to supplement senescent grasses and cereal crop residues.     

Sol-gel processed silica/titania/ÿ-Glycidoxypropyltrimethoxysilane composite materials for photonic applications

Silica/titania/?-Glycidoxypropyltrimethoxysilane composite materials processed by the sol-gel technique were studied for photonic applications. Waveguide thin films with thickness more than 1.7 μm were prepared by the sol-gel spin coating technique and low temperature heat treatment from this high titanium content composite materials. The films were analyzed by atomic force microscopy (AFM), ellipsometry, differential thermal analysis (DTA), thermal gravimetric analysis (TGA), UV-visible spectroscopy (UV-VIS), and Fourier transform infrared (FT-IR) spectroscopy. It was observed that the film becomes thinner as the titanium contents increase. A change of the refractive index through the range 1.52–1.61 at the optical wavelength of 633 nm was achieved by varying the molar ratio between silica and titanium. A dense, low absorption, and high transparency in the visible range waveguide films could be obtained at a low temperature. It was also noted that organic compounds in the film would decompose in the temperature range from 200°C to 480°C. Accordingly, purely inorganic silica-titania films with a thickness of about 0.7 μm could also be obtained by a single-coating process, when the film was baked at a temperature of 500°C or higher. The waveguides properties and photonic applications of the composite material solgel films were also investigated.