厌氧氨氧化生物脱氮技术浅析

厌氧氨氧化生物脱氮技术作为一种新的生物脱氮技术因其自身的优点,备受国内外水处理界的关注。本文阐述了厌氧氨氧化的发展、典型工艺及其应用,分析了它的影响因素,并提出了今后的技术展望。     

特种覆铜板实现产业化

“特种覆铜板”主要是指聚酰亚胺玻璃布覆铜板、微波电路用覆铜板及适应无铅化婴求的FR-4覆铜板。目前聚酰亚胺玻璃布覆铜板已在国营第七0四厂试产成功．微波电路用覆铜板、适应无铅化要求的FR-4覆铜板也即将投入大批量生产。     

单机架初轧机轧制圆钢孔型系统优化

针对单机架初轧机轧制圆钢设计出一种多角孔型系统，介绍了该系统的设计及优化过程，通过实施，提高了轧机作业率。     

深孔卸压爆破控制冲击地压的机理及应用

随着煤矿开采深度的增加,冲击地压危险越来越大,已成为严重威胁矿井安全生产的主要灾害。深入分析了深孔卸压爆破影响区域及其控制冲击矿压的机理,介绍了爆破卸压工艺,并对深孔卸压爆破效果进行了分析。实践证明,深孔卸压爆破可有效地减缓煤岩体应力集中,控制冲击地压的发生,实现煤矿安全生产。     

拉杆注射模具设计及制造

本文以拉杆为例详细阐述了两板式潜伏浇口注射模具的结构设计要点与工作过程,通过采用典型的型芯结构、多弹簧顶出复位系统,使得模具的使用寿命和可靠性大大提高;经过在实践中不断优化加工工艺、控制加工精度和改进配模技术,从而大大缩短了配模时间和模具的制造周期,提高了劳动生产效率,降低了模具的制造成本     

特种高压变压器绕制工艺技术研究

某特种高压变压器按工艺要求生产后,因外径尺寸偏小,放入灌注模具中,其高压引线柱不能伸进模具内壁的高压孔内,无法对高压变压器进行测试.对其留边量进行放大调整后,在测试电路中不能起振.经过分析研究和一系列绕制实验,找到了适合此特种高压变压器的留边量,使其符合灌注模具尺寸及耐压要求,又能在测试电路中正常起振.通过对绕制工艺的改进,解决了分布电容及漏感过大问题,高压变压器满足了使用要求.     

莱钢超设计规格40号槽钢的研发

介绍了40号槽钢的生产工艺,对生产过程中存在的工艺问题进行了分析,并制定了下一步的工艺优化方案.     

Water reconditioning by high power ultrasound combined with residual chemical sanitizers to inactivate foodborne pathogens associated with fresh-cut products

The suitability of high power ultrasound (HPU, 20 kHz, 0.28 kW/l) combined with residual chemical sanitizers for water reconditioning was studied. A synergetic disinfection effect was observed when HPU was combined with peroxyacetic acid (PAA) or a commercial mix of organic acids and phenolic compounds (OA/PC). In recycled water (RW) with a chemical oxygen demand (COD) of 500 mg O₂/l, PAA inactivated 2 log units of Escherichia coli O157:H7 at concentrations of 3.2, 6.4, 16 mg/l after 7 min, 2 min, 29 s, respectively. The OA/PC or HPU treatments alone needed 26 min treatments to achieve the same reduction. The addition of TiO₂ (5 g/l) to HPU (sonocatalysis) did not improve E. coli O157:H7 inactivation. However, when HPU was combined with a residual concentration of PAA (3.2 mg/l), the total inactivation of E. coli O157:H7 and Salmonella (6 log unit reductions) occurred after 11 min, but for Listeria monocytogenes only 1.7 log reductions were detected after 20 min. When HPU was combined with OA/PC, a synergistic effect for the inactivation of E. coli O157:H7 was also observed, but this sanitizer significantly modified the physical-chemical quality characteristics of the RW. These results show that the residual PAA concentration that can be found in the wash water combined with HPU could result in an environmentally friendlier and toxicologically safer strategy for water reconditioning of the fresh-cut industry. The use of the sanitizer alone requires higher concentrations and/or longer contacts times. Even though the residual PAA in combination with HPU was adequate for water reconditioning, it is not appropriate for the process wash water because this wash water must be instantaneously disinfected.     

食品感官分析技术在产品开发中的应用

食品感官分析技术是一门新兴学科和技术，在新产品的开发及改进中具有重要的意义。综述了食品感官分析技术的分类、方法及在产品开发中的应用。     

发酵牛肉香肠菌种的筛选及工艺优化

试验先对几种乳酸菌进行筛选试验,找到适合牛肉发酵香肠的菌种,然后对利用这些菌种制作发酵牛肉香肠的工艺进行优化。结果表明,经过筛选发现清酒乳杆菌、发酵乳杆菌和藤黄微球菌适合生产牛肉发酵香肠,最佳工艺条件为发酵剂的添加量为104cfu/100g、作用温度为30℃、作用时间为60h。