大豆蛋白酶解产物降胆固醇活性的初步研究

研究了用AS1.398和Alcalase两种蛋白酶制备的水解度为10%～24%的大豆蛋白酶解产物的降胆固醇活性.结果表明:用Alcalase酶水解大豆蛋白,水解度为18%的产物降胆固醇活性最高,添加量为5 mg/mL时,对胆固醇胶束溶解度的抑制率为48.39%,动物实验表明该产品在灌喂剂量大于1 g/(kg·d)时,对喂饲高脂饲料小鼠的血清总胆固醇降低作用比较显著(P＜0.025),30 d后降低幅度可达30%以上.     

一起COMPASS产品故障的分析与处理

通过对一起COMPASS产品内部异常响声故障的现场分析、判断、处理过程的总结,指出了COMPASS产品内部存在的结构和装配工艺弱点,提请该产品的所有用户共同关注这类问题,一旦发现类似现象必须及时检查处理,以确保设备及电网的安全运行。     

IP电话在电力调度通信网中的应用

IP电话(Internet Telephone)是指在IP网上通过TCP／IP协议实时传送语音信息的应用。论文利用电力调度系统通信网与Internet的共性，提出可以在电力调度系统通信网上实时传送语音信息，这样做可以充分利用电力通信网的带宽，节省调度系统通信费用，而且仅需要简单的设备便可实现覆盖面广、接入方便的电力调度系统通信网IP电话。因此，电力调度系统通信网IP电话的应用前景十分广阔。     

鳍片式省煤器在HG-670-140-12型锅炉上的应用

介绍了在HG-670—140—12型锅炉上将原光管省煤器改造为鳍片式省煤器的有关选型、热力计算、结构设计、制造安装的过程，改造后的鳍片式省煤器能有效减轻磨损，节约管材36％，防止管排弯曲变形，有利于省煤器的安全稳定运行。     

Rheological behavior of continuous roll casting process of aluminum alloy

The rheological behavior of aluminum alloy and its influencing factors in physical simulation of continuous roll casting process were studied by using a Gleeble-1500 thermal-mechanical simulation tester with a set of special clamp system. The relationships between the flow stress and the strain rate in the deformation process of simulating roll casting experiment were obtained. The results show that four different characteristic stages exist in the temperature range of the whole rheological process. The first occurs when the temperature is higher than 600℃, which belongs to the creep deformation stage; the second occurs when the temperature lies in the range of 500 - 600℃, and it can be regarded as the high temperature and low stress level deformation stage; the third occurs when the temperature decreases to the range of 300 - 500℃, it is considered to be the middle stress level deformation stage; the last occurs when the temperature is less than 300℃ and the strain rate is less than 1.00 s^-1 , it belongs to middle stress level deformation stage. But when the strain rate is larger than 1.00 s^-1, it belongs to the high stress level deformation stage. And the relative constitutive models suitable for the four different stages of continuous roll casting process were established through multivariate linear regression analysis of the experimental data.     

Influences of a New Admixture MX on Concrete Durability

The performance of concrete with a new admixture MX was studied by using the freeze-thaw cycle, permeability aud chemical attack test. The experimental results show that MX improves the durability of concrete. Within the optimum proportion ranges from 0. 1% to 1% , the compressive strength of concrete after freezethaw is increased by 20%- 50% , and Young‘ s modulus can be increased by 3.76- 5.64 times. The strength aud weight loss of concrete with 0. 4% MX are respectively decreased by 28% and 60% after hydrochloric acid attack.The strength aud weight loss of concrete with 0. 4% MX are decreased by 5%- 20% after sulfuric acid aud sodium sulfate attack. The permeability of concrete with 1% MX at 28 days can be decreased by more than 30% . The investigation of the negative temperature property of MX aud analysis on concrete composition and microstructure by MIP reveal that the heat couduction is resisted aud the freezing procedure of solution in concrete pore is retarded due to the adding of MX. Moreover, the pore structure of concrete with MX is improved, thus improving the durability. Bated on this study, a resistance model of MX to block the heat aud mass transference was proposed, and the mechanism of durability improvement of concrete with MX was explained.     

Selective recognition in molecularly imprinted polymer and its chromatographic characterization for cinchonine

A molecularly imprinting polymer (MIP) was synthesized via bulk polymerization under different conditions using anti-ague drug cinchonine (CN) as template. Infrared spectra (IR) results show that the template CN and functional monomer α-methyl acrylic acid (MAA) formed complexes before polymerization and the structure of complexes was simulated by Hyperchem. The results indicate that there are hydrogen bond or ionic bond between functional monomer and template molecule in acetonitrile solution. The MIP made in cold-initiated photo-polymerization has higher separation performance than that in the therm-initiated polymerization. The separation of the isomers CN and cinchonidine (CD) can be successfully obtained when its separate factor α reaches 1.82. Scatchard analysis suggests that the MIP recognizing CN with two classes of binding sites. The partition coefficient K _{d, 1} and apparent maximum number n _{max, 1} of binding sites with high affinity are 131.43 μmol/L and 58.90 μmol/g, respectively, while K _{d, 2} and n _{max, 2} of binding sites with low affinity are 2.32 mmol/L and 169.08 mmol/g, respectively. Foundation item: Project(2004035085) supported by the Postdoctoral Science Foundation of China; project(04JJ3080) supported by the Natural Science Foundation of Hunan Province     

Performance of Pile-Supported Bridge Approach Slabs

A large number of pile-supported bridge approach slabs in southeastern Louisiana were examined to identify the factors that affect their long-term performance. Design drawings and subsoil conditions at these sites as well as their traffic and maintenance records were compiled, and seven representative test sites were selected for thorough field investigation that included inspection of the approach slabs, bridge decks, bridge abutments, and roadway pavement. Field evaluation included walking profiler, falling-weight deflectometer (FWD), laser profiler, geodetic survey, soil borings, cone penetrometer, and nondestructive testing. Measurements made with the walking profiler agreed well with the geodetic survey. The FWD and nondestructive testing were effectively used to detect voids under the approach slab. Results of the study indicated that the current empirical methodology used by the Louisiana Department of Transportation and Development for design of pile-supported approach slabs yields inconsistent field performance. It was concluded that this inconsistent performance is primarily due to the differences in roadway embankment design and construction and in subsoil conditions, which in turn affect the negative skin friction (downdrag) loads imparted on the piles. Impact of other variables such as ramp type, speed limit, traffic volume, and so on was found to be insignificant. Results of the field study were used to develop a new rating system for approach slabs (IRIS) based on International Roughness Index (IRI) measurements obtained with the laser profiler.     

桃花嘴铜金铁矿床成矿作用与矿床成因的探讨

根据资料及主要以作者多年来矿山地质工作经验对桃花嘴铜金铁矿床的地层、构造、岩浆岩、围岩蚀变、及成岩成矿物质的来源、矿液的迁移与沉淀富集规律进行研究分析,并对其成矿作用方式、矿床成因进行探讨。     

Cold Modelling of Slag Splashing in LD Furnace by Oxygen Lance with Twisted Nozzle Tip

The effects of a conventional lance tip with 4 normal nozzles and a lance tip with 4 twisted nozzles on slag splashing were investigated. A cold model for LD converters, Jiuquan Iron & Steel Co., was established and the amount of slag splashed onto the model walls was measured in the cold modelling experiments. The results from the experiments show that at low top gas flow rate the amount of slag splashing for the tip with twisted nozzles is less than that for the conventional tip, whereas at high top gas flow rate the amount of slag splashing for the nozzle twisted lance is greater than that for the conventional lance. For the nozzle twisted lance tip, slag splashing rates increase with increase in slag amount, lance height and top gas flow rate and the maximum amount of slag splashing for the tip with twisted nozzles can be obtained under the process parameters of 47.6 Nm³/h gas flow rate, 12% slag amount and 247 mm lance height. More slag droplets can be directed onto the cone with a nozzle twisted lance tip than with a normal lance tip at high top gas flow rate.