Two New Models for the Permeate Flux of the Outer-helical-flow Microfiltration Module

研究新型外旋流管式微滤膜器渗透通量的变化规律,建立渗透通量的稳态经验模型和动态衰减模型两个新模型.二者各有侧重,前者主要针对稳定过滤状态下的渗透通量,作者将影响渗透通量的因素归纳成膜器进口雷诺数和欧拉数等重要的无因次数群,提出了具体的公式;后者用于描述通量随时间衰减变化的过程,是一个幂函数模型,比原有线性模型更符合实际情况.通过实验对这两个通量模型进行验证,最大偏差分别为13.9%和30%.两个模型均有一定实用价值,前者为膜器放大优化设计奠定基础,后者有助于渗透通量的实时监控操作,两者统一,能进一步改善外旋流管式微滤膜器的实用效果.Variation regularities of the permeate flux in the new outer-helical-flow microfiltration module are tested,and then two new mathematical models which emphasize on different aspects in this equipment are presented.The first model stresses on the permeate flux in the stable stage of the filtration.Here we sum up the influence factors into some important dimensionless parameters like Re_θ and Eu which has been introduced for the first time to characterize the energy loss in this assembly,and consequently we conclude a concrete empirical formula for the permeate flux.The second one accentuates the dynamic attenuation process of the flux along with time,which is a power function equation and conforms to the real varying situation better than the existant linear one does.We also validate these new flux models with the experimental data.The deviations between the results predicted in these two equations and the experimental ones are less than 13.9% and 30%,respectively.In summary,although these two new models for the permeate flux in the outer-helical-flow microfiltration module have different perspective and meaning,they both have notable value in the practical use,for example,the former supplies a basis for the scale-up and the optimal design of the module and the latter is helpful for the real-time monitoring operation to the permeate flux.Therefore,integrate them with purpose and we will further advance the application effect of this novel microfiltration equipment.国家自然科学基金(29976025)资

甘薯生化转化技术研究

甘薯是营养丰富、具有保健功能的作物,为了改善目前甘薯加工产品同质化严重的问题,国家甘薯产业技术体系产后加工研究室以清洁生产为核心,利用酶及微生物进行了甘薯生化转化技术的研究。基于复合降黏酶的降黏技术可使甘薯黏度下降90%以上,高效乙醇发酵技术实现了在万吨级生产线上于30 h内乙醇浓度达12%(V/V),果酒酿造技术使甘薯酒浓度达11%(V/V),果醋酿造技术使甘薯醋浓度达36 g/L,乳酸益生菌饲料制备技术使甘薯淀粉加工废渣中乳酸菌数达3.04×108cfu/g,蛋白饲料制备技术将甘薯淀粉加工废渣中蛋白含量增加至18%。相关技术的研发和推广有助于拓展加工产品种类,推动甘薯加工向精、深加工发展

甘薯淀粉加工废渣生产蛋白饲料的工艺

以甘薯淀粉加工废渣为原料,研究了以酿酒酵母、产朊假丝酵母以及双菌混合培养生产菌体蛋白的工艺。结果表明:以酿酒酵母为菌种,其最佳培养条件为自然pH值、薯渣含水率75%、培养温度32℃、接种量10%、尿素1.5%、纤维素酶0.5%、异淀粉酶0.5%,薯渣中真蛋白质量分数达12.01%;以产朊假丝酵母为菌种,除尿素添加量为1%外,其利用甘薯渣生产菌体蛋白的最适培养条件与酿酒酵母一致,薯渣中真蛋白质量分数达16.36%;以酿酒酵母和产朊假丝酵母进行混合接种培养时,其最佳接种配比为1∶1,此时薯渣中真蛋白质量分数达18.08%

Technology of High-performance Fermentation from Tubers with High Viscosity for Bioethanol Production Promote theAdjustment of China’s Energy Structure

原料粘度高已成为限制薯类乙醇行业发展的问题,中国科学院成都生物研究所采用糖苷键单克隆抗体芯片技术阐明薯类原料粘度成因机制,并开发出具有自主知识产权的降粘酶系和相应的降粘预处理工艺;利用模拟的工业发酵压力条件,选育获得高产物反馈抑制耐性菌株;同时与发酵过程调控工艺、新型高传质反应器系统集成,建立薯类乙醇高效发酵技术体系并成功应用于生产,实现薯类乙醇发酵三大技术突破

绿色农业新技术集成研究与示范

一、该项目针对农业生产中食品安全和环境污染问题,开展了S-诱抗素、新奥霉素、壳寡糖、棉铃虫病毒杀虫剂与昆虫病原线虫生物制剂、功能性堆肥及其浸提液工业化生产等的试验和示范,立项准确,针对性强,意义重大。 二、项目研究出S-诱抗素等生物制剂及其生产工艺、工厂化技术;研究开发出昆虫病原线虫活体繁殖技术,实现了工厂化生产;研究开发了两种功能性堆肥及浸提液,提出了“功能性堆肥+秸秆生物反应堆+堆肥浸提液+S-诱抗素等生物制剂”健康、安全设施蔬菜生产模式;在宁夏实现了地上、地下,土壤、作物生物制剂联防技术体系,为低耗、高效、安全、健康农产品生产开辟了新途径。 三、在S-诱抗素、新奥霉素高产菌株的生产工艺,昆虫病原线虫活体繁殖工厂化生产方面取得了新突破;在S-诱抗素、新奥霉素、壳寡糖、棉铃虫病毒杀虫剂、功能性堆肥及其浸提液集成应用控制作物病虫害等方面有创新。研究成果达到了国内先进水平,S-诱抗素、新奥霉素高产菌株的生产工艺研究达到国际领先。 四、项目执行期间,在宁夏15个市县建立核心试验基地14个,示范推广点40个,累计推广面积17万亩,新增效益9600万元。获得发明专利4项,实用新型专利1项,制定地方标准5项,专著1部,发表论文19篇(其中SCI收录6篇)。培训农技人员300人次,农民4700多人次

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements