Treatment of slices from carrot (<Emphasis Type="Italic">Daucus carota</Emphasis>) using high intensity white pulsed light

Experiments with washing of carrot slices using distilled water and 0.9% (w/w) NaCl in combination with varying number and pulses of high intensity white were carried out. Slices of carrot 3.5 cm in diameter and 2 mm thick were inoculated using diluted dispersions of yeasts (Saccharomyces cerevisiae) for varying time (0–240 min) and then the slices were treated with high intensity pulsed white light (one pulse = 0.7 J/cm²) using from none to 24 pulses. The major part of the yeast cells were killed using two pulses of light. The studies included washing of inoculated slices up to five times using salt 0.9% (w/w) NaCl and distilled water and inoculation at 22 °C for between 5 and 120 min. It was concluded that treatment of carrot slices with high intensity white light may reduce the load of yeast cells with up to 6 log cycles. Inoculation time at 22 °C had no effect on the maximum load of yeast cells.     

基于MCS-51单片机的洗衣机控制系统设计

根据洗衣机的控制要求,从功能要求、硬件设计、软件设计三个方面描述了一个以MCS-51单片机为控制核心的洗衣机控制系统。给出了硬件线路框图和相关的控制程序流程图。     

欧盟RoHS指令在洗衣机产品中的实践

本文简要介绍了RoHS指令要求及在国内外的落实和进展情况,详述了该指令的实施步骤及过程,针对海尔洗衣机产品在落实RoHS指令中遇到的一些问题和难点进行了分析、讨论,文中给出了一部分零部件具体详实的测试数据,做必要的对比说明,并肯定了这一新技术要求在洗衣机产品中全面落实是可行的。     

精密异型钛材热处理工艺研究

采用清洗—碱洗—酸洗工艺对眼镜用精密异型钛材进行真空退火前的预处理,给出了工艺控制条件并进行了讨论。对氢脆的危害进行了探讨,得出了适宜的真空退火条件。试验表明,按确定的真空退火前预处理工艺和真空退火工艺条件处理后的精密异型钛材,能够获得非常光亮的表面,满足后续加工工艺和产品质量要求。     

浅谈ISA阴极铜加工机组

本文主要对泰铜(简称TCI)的ISA电解阴极铜加工机组进行介绍,并和江西铜业集团公司贵溪冶炼厂(简称JCC)的ISA电解阴极铜加工机组进行比较。     

Effects of Quillaja saponaria extract and Nα-lauroyl-l-arginine ethyl ester on reducing selected foodborne pathogens in vitro and maintaining quality of fresh-cut endive (Cichorium endivia L.) at pilot plant scale

The aim of the present study was to evaluate the applicability of Quillaja saponaria extract (QSE) and N^α-lauroyl-l-arginine ethyl ester (LAE) as antimicrobial wash water additives in fresh-cut lettuce processing. Antibacterial activities of LAE and QSE against selected strains of the foodborne pathogens Salmonella enterica, Bacillus cereus, Staphylococcus aureus, Pseudomonas aeruginosa, and Listeria monocytogenes were examined in vitro. Minimum inhibitory concentrations determined by broth microdilution assay demonstrated that LAE exhibited a strong antimicrobial activity with MICs between 4 and 32 μg/mL against all tested strains, whereas QSE showed a weaker antimicrobial activity with MICs >512 μg/mL. On a pilot-plant scale, the effects of warm water washing at 45 °C for 120 s with and without 40 mg/L QSE or 100 mg/L LAE as well as cold water washing at 4 °C for 120 s with QSE or LAE, respectively, of shredded endive (Cichorium endivia L.) were investigated regarding microbiological and sensory quality as well as physiological properties. Samples were analyzed for headspace O₂ and CO₂ levels, phenylalanine-ammonia-lyase activity and contents of nitrite and nitrate during nine days of cold storage at 4 °C. By analogy to its antimicrobial effect against the foodborne pathogens in vitro, LAE allowed up to 4 log₁₀ cfu/mL reduction of the microbial load in the washing water of the pilot plant, and might therefore reduce cross-contamination while saving water. The addition of LAE to warm washing water impaired sensory properties of fresh-cut endive during storage, which was predicted by chlorophyll fluorescence imaging analyses. QSE treatment combined with warm water washing best retained sensory appearance throughout our study, being possibly suitable for the production of premium products.     

一种高效清除井壁滤饼的新型固井冲洗液

为有效清除水基钻井液滤饼,提高固井界面胶结强度和固井质量,基于水溶性纤维的强冲刷原理和滤饼氧化分解原理,研究出一种新型的固井冲洗液（WD-C） ：0.5%WF-H纤维+2.2%WF-O氧化剂+0.35%FeSO₄ +1.8%KCl+3.0%膨胀珍珠岩粉+水,密度为1.03 g/cm³。为此,系统地测试评价了该冲洗液对水基钻井液滤饼的清洗效率和改善固井界面胶结强度的性能,并通过红外光谱（IR）、扫描电镜（SEM）和元素分析（EDS）等方法分析了其对界面胶结物的理化特征和微观结构的影响。结果表明,该冲洗液对水基钻井液滤饼具有良好的冲洗作用（冲洗干净时间在10 min内）,且界面胶结处的水泥颗粒能够正常水化,生成水化硅酸钙凝胶、Ca（OH）₂和棒状钙矾石（AFt）晶体,并相互交织并形成致密网络结构,能显著提高固井二界面胶结强度,进而提高固井质量。该研究成果为解决高效快速清除水基钻井液滤饼、提高固井二界面胶结强度技术难题提供了又一种新的技术方法。     

SHELL气化洗涤塔出口合成气带水原因分析及对策

通过对洗涤塔内部结构的分析,阐述了洗涤塔出口合成气带水的现象及危害,找出引起洗涤塔工艺气带水的原因、带液后的处理措施,以及对洗涤塔减少带水的改造方向。     

鄱阳湖现代冲淤动态分析

通过对鄱阳湖现代动力分析,分析了鄱阳湖物质来源主要是五河带来的泥沙为主,水流是输沙的主要动力,叙述了五河入湖口扩散区、湖体冲淤动态。     

竹炭的改性及对PP废塑料性能影响的研究

首先用硅烷偶联剂γ-氨丙基三乙氧基硅烷(KH550)处理竹炭(BC)得到K-BC,再通过熔融共混制备了一系列的K-BC/聚丙烯废洗衣机料(X-PP)复合材料,通过扫描电子显微镜(SEM)表征了BC的形貌,分析了K-BC含量对复合材料物理性能、尺寸稳定性、热变形温度(HDT)及维卡软化温度(VST)的影响.结果发现,BC...