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Differences in neuroplasticity after spinal cord injury in varying animal models and humans 预览
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作者 Mallory E. Filipp Benjamin J. Travis +5 位作者 Stefanie S. Henry Emma C. Idzikowski SarahA. Magnuson Megan YF Loh Daniel J. Hellenbrand Amgad S. Hanna 《中国神经再生研究:英文版》 SCIE CAS CSCD 2019年第1期7-19,共13页
关键词 动物模型 绳索 损害 四足动物 治疗学 老鼠 运动 小径
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Silver recovery as Ag~0 nanoparticles from ion-exchange regenerant solution using electrolysis
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作者 Tabish Nawaz Sukalyan Sengupta Chen-Lu Yang 《环境科学学报:英文版》 SCIE EI CAS CSCD 2019年第4期161-173,共13页
Many silver(Ag)containing consumer-products(e.g.textiles)release Ag into the environment,posing ecotoxicological risks.Ag recovery mitigates environmental hazards,recycles Ag,and leads to sustainability.In the present... Many silver(Ag)containing consumer-products(e.g.textiles)release Ag into the environment,posing ecotoxicological risks.Ag recovery mitigates environmental hazards,recycles Ag,and leads to sustainability.In the present work,Ag has been recovered as Ag~0nanoparticles from the spent solution(thiourea(TU)~0.5 mol/L pH~1.1–1.2,and Ag~550 mg/L)obtained from the regeneration of an Ag-loaded resin using a simple undivided electrolytic cell.The reclaimed regenerant solution has been recycled and reused in a closed-loop scheme over multiple cycles.The process parameters,i.e.,current(0.05 A)and stirring speed(600 r/min),have been optimized for Ag recovery of~94%and TU loss of~2%.The reclaimed regenerant solution has been shown to regenerate Ag-loaded resin samples with>90%regeneration efficiency over 4 cycles of consecutive extraction and regeneration.The recovered Ag~0nanoparticles are monodisperse,consistently spherical in shape,and have a mean diameter of~6 nm with standard deviation of the Gaussian fit as~2.66 nm. 展开更多
关键词 Silver RECOVERY Ag~0 NANOPARTICLES Waste management THIOUREA Sustainability Resource RECOVERY ELECTROWINNING
马钢2号高炉炉况处理实践 预览
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作者 尤石 曹海 +1 位作者 陶华 赵淑文 《安徽冶金科技职业学院学报》 2019年第2期25-28,共4页
对马钢2号高炉炉况波动的原因和处理进行了总结。2号高炉投产不久,也就是2018年2月中下旬炉况出现波动,从高炉上下部制度、焦炭的库存和质量等方面进行分析,并根据炉况波动不同的阶段采取相应措施,避免了炉况失常,实现炉况根本性的好转... 对马钢2号高炉炉况波动的原因和处理进行了总结。2号高炉投产不久,也就是2018年2月中下旬炉况出现波动,从高炉上下部制度、焦炭的库存和质量等方面进行分析,并根据炉况波动不同的阶段采取相应措施,避免了炉况失常,实现炉况根本性的好转,产量大幅度提高,取得较好效果。 展开更多
关键词 高炉 炉况处理 焦炭 恢复
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山西某铅金混合精矿铅金分离试验 预览
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作者 廖银英 杨远坤 +1 位作者 吴双桥 吕兵超 《有色金属:选矿部分》 CAS 北大核心 2019年第1期53-56,共4页
针对山西某金矿选矿厂铅金混合精矿铅未达到销售计价的品位、导致矿石价值下降的问题。试验采用一次粗选两次扫选两次精选的工艺流程,闭路试验可获得Pb品位60. 35%、含Au 54. 06 g/t、含Ag 2 708. 80 g/t的铅精矿,铅回收率为59. 41%、A... 针对山西某金矿选矿厂铅金混合精矿铅未达到销售计价的品位、导致矿石价值下降的问题。试验采用一次粗选两次扫选两次精选的工艺流程,闭路试验可获得Pb品位60. 35%、含Au 54. 06 g/t、含Ag 2 708. 80 g/t的铅精矿,铅回收率为59. 41%、Au回收率26. 05%、Ag回收率37. 79%;Au品位33. 34 g/t、Ag品位968. 97 g/t的金精矿,Au回收率为73. 95%、Ag回收率62. 21%。该工艺可使矿石中方铅矿得到充分回收利用,同时不影响金银的总回收率,提高了选矿厂的经济效益。 展开更多
关键词 铅金混合精矿 铅金分离 浮选 回收率
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电动汽车制动能量回收控制系统的设计 预览
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作者 马文静 《常州信息职业技术学院学报》 2019年第3期35-38,共4页
根据电动汽车的工作特性,设计了电动汽车制动能量回收控制系统。该控制系统以单片机为主控制器,控制永磁直流电机、IGBT、蓄电池组、机械传动系统等协调工作,来达到有效回收制动能量的目的。此控制系统操作简单、设计合理、可靠性高,有... 根据电动汽车的工作特性,设计了电动汽车制动能量回收控制系统。该控制系统以单片机为主控制器,控制永磁直流电机、IGBT、蓄电池组、机械传动系统等协调工作,来达到有效回收制动能量的目的。此控制系统操作简单、设计合理、可靠性高,有效提高了电动车的续航能力。 展开更多
关键词 电动汽车 制动能量 回收
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Transplantation of adult spinal cord grafts into spinal cord transected rats improves their locomotor function
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作者 He Shen Xi Chen +3 位作者 Xing Li Ke Jia Zhifeng Xiao Jianwu Dai 《中国科学:生命科学英文版》 SCIE CAS CSCD 2019年第6期725-733,共9页
Grafted embryonic central neural tissue pieces can recover function of hemisected spinal cord in neonatal rats and promote axonal growth in adults. However, spinal cord segments from adults have not been used as donor... Grafted embryonic central neural tissue pieces can recover function of hemisected spinal cord in neonatal rats and promote axonal growth in adults. However, spinal cord segments from adults have not been used as donor segments for allogeneic transplantation. Here, we utilized adult spinal cord tissue grafts(aSCGs) as donor constructs for repairing complete spinal cord injury(SCI). Moreover, to provide a favourable microenvironment for SCI treatment, a growth factor cocktail containing three growth factors(brain-derived neurotrophic factor, neurotrophin-3 and vascular endothelial growth factor), was applied to the aSCG transplants. We found that the locomotor function was significantly improved 12 weeks after transplantation of aSCGs into the spinal cord lesion site in adult rats. Transplantation of aSCGs combined with these growth factors enhanced neuron and oligodendrocyte survival and functional restoration. These encouraging results indicate that treatment of complete SCI by transplanting aSCGs, especially in the presence of growth factors, has a positive effect on motor functional recovery, and therefore could be considered as a possible therapeutic strategy for SCI. 展开更多
关键词 SPINAL CORD injury (SCI) TRANSPLANTATION ADULT SPINAL CORD GRAFTS (aSCGs) function recovery ADULT host transection
Stabilizing silica nan oparticles in high saline water by using polyvinylpyrrolidone for reduction of asphaltene precipitation damage under dynamic condition
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作者 Mohammad Reza Aghajanzadeh Mohammad Sharifi 《中国化学工程学报:英文版》 SCIE EI CAS CSCD 2019年第5期1021-1029,共9页
In this study, the performance of stable nanofluid containing SiO2 nanoparticles dispersed and stabilized in high salinity brine for asphaltene inhibition in dynamic condition is evaluated. In the first stage of this ... In this study, the performance of stable nanofluid containing SiO2 nanoparticles dispersed and stabilized in high salinity brine for asphaltene inhibition in dynamic condition is evaluated. In the first stage of this work, the stability of silica nanoparticles in different range of water salinity(0–100000 mg·L-1) is investigated. Next, stable nanofluid containing highest salinity is selected as asphaltene inhibitor agent to inject into the damaged core sample. The estimated values of oil recovery for base case, after damage process and after inhibition of asphaltene precipitation using nanofluid are 51.6%, 36.1% and 46.7%, respectively. The results showed the reduction in core damage after using nanofluid. In addition, the relative permeability curves are plotted for the base case, after damage process and also after inhibition of asphaltene precipitation using nanofluid. Comparison of relative permeability curves shows, relative permeability of oil phase decreased after damage process as compared with the base case. But after using nanofluid the oil relative permeability curve has shifted to the right and effective permeability of oil phase has been improved. 展开更多
关键词 Formation DAMAGE Enhanced oil recovery SALINITY ASPHALTENE Core FLOODING Nano particles
丁香酚对黄斑篮子鱼幼鱼麻醉效果的研究 预览
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作者 曹晓聪 黄小林 +4 位作者 孙莘溢 林黑着 舒琥 杨育凯 黄忠 《南方水产科学》 CAS CSCD 北大核心 2019年第3期50-56,共7页
该研究在水温为(29.3±1.1)℃的自然海水条件下,测定了不同质量浓度丁香酚对体质量为(4.83±1.30)g的黄斑篮子鱼(Siganus oramin)的麻醉效果。结果显示,在30~80 mg·L^–1时,黄斑篮子鱼幼鱼的入麻时间随其浓度的升高而减少... 该研究在水温为(29.3±1.1)℃的自然海水条件下,测定了不同质量浓度丁香酚对体质量为(4.83±1.30)g的黄斑篮子鱼(Siganus oramin)的麻醉效果。结果显示,在30~80 mg·L^–1时,黄斑篮子鱼幼鱼的入麻时间随其浓度的升高而减少,复苏时间随其浓度的升高而增加。麻醉过程中,呼吸频率在浅麻时略微上升,深麻时快速下降,直至麻醉过度呼吸停止。研究发现,丁香酚质量浓度在30~100 mg·L^–1时,黄斑篮子鱼幼鱼均能在3 min内进入4期麻醉,4 min内完全复苏,成活率100%。入麻后在空气中暴露时间少于8 min时,复苏时间随暴露时间的增加而减少,大于8 min时,复苏时间随暴露时间的增加而延长,且复苏率逐渐下降。结果表明,丁香酚对黄斑篮子鱼幼鱼具有入麻快、复苏时间短、复苏率高等优点,是其理想的麻醉剂;建议生产上使用的质量浓度为30 mg·L^–1,且入麻后人工操作不宜超过6 min,若追求更快麻醉,丁香酚质量浓度也不宜超过80 mg·L^–1。 展开更多
关键词 黄斑篮子鱼 丁香酚 麻醉 复苏 呼吸频率
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混合光交换网络失效数据恢复方法仿真 预览
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作者 吴应桦 《计算机仿真》 北大核心 2019年第4期404-407,424共5页
对混合光交换网络失效数据进行恢复,能够有效提高混合光交换网络的通信质量。针对当前混合光交换网络失效数据恢复方法存在的恢复过程复杂、恢复速度慢、恢复后数据质量较差的问题,提出一种基于灰色GM(1,N)模型的混合光交换网络失效数... 对混合光交换网络失效数据进行恢复,能够有效提高混合光交换网络的通信质量。针对当前混合光交换网络失效数据恢复方法存在的恢复过程复杂、恢复速度慢、恢复后数据质量较差的问题,提出一种基于灰色GM(1,N)模型的混合光交换网络失效数据恢复方法。通过对混合光交换网络的失效数据进行灰色相关分析,建立灰色GM(1,N)模型,并通过残差修正的方法,提高失效数据的恢复质量。对失效数据的缺失数据点进行定位,将缺失数据集划分为完备和不完备数据集,按照完整度大小确定不完备数据集在完备数据集中的k近邻,根据误差平方和最小原则对重构权值进行计算,通过重构权值实现失效数据的恢复。实验结果表明,所提方法恢复速度较快,恢复后数据丢包率较低,数据可靠度较高。 展开更多
关键词 混合光交换网络 失效数据 恢复
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空调冷凝水回收专利技术分析 预览
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作者 陈若男 唐恺 《河南科技》 2019年第6期59-61,共3页
本文根据国内外空调冷凝水回收利用领域的专利技术,对本领域的专利申请进行统计分析,着重介绍了本领域国内外的专利申请年度分布趋势、主要技术来源国及本领域的重要申请人,为空调冷凝水回收利用的进一步研究提供思路。
关键词 空调 冷凝水 回收 专利
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响应面法优化含锰钛白废水制备碳酸锰的工艺 预览
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作者 何海霞 万亚萌 +3 位作者 陈欢哲 杨昆鹏 李涛 任保增 《化工进展》 EI CAS CSCD 北大核心 2019年第6期2649-2657,共9页
以硫酸法钛白粉生产过程产生的含锰废水为原料,以碳酸氢铵溶液为沉淀剂,十二烷基硫酸钠为添加剂,采用液相沉淀法对废水中的锰进行资源化回收。在单因素实验基础上,采用响应面法中的Box-Behnken Design优化实验设计,分别考察了反应温度... 以硫酸法钛白粉生产过程产生的含锰废水为原料,以碳酸氢铵溶液为沉淀剂,十二烷基硫酸钠为添加剂,采用液相沉淀法对废水中的锰进行资源化回收。在单因素实验基础上,采用响应面法中的Box-Behnken Design优化实验设计,分别考察了反应温度、过量系数、pH和陈化时间四因素对碳酸锰沉淀率的影响,建立了响应值与影响因素间的回归方程,并确定了优化条件为:反应温度33.3℃、过量系数1.06、pH=7.2、陈化时间2.0h,在该条件下锰的沉淀率预测值为99.30%,相应的实验值为98.90%,预测值与实验值相对误差仅0.4%,表明响应面法所建立的预测锰沉淀率的模型可靠;所得产品经电感耦合等离子体发射光谱仪(ICP-AES)分析锰含量为43.53%,符合工业碳酸锰(HG/T 4203-2011)质量标准中对碳酸锰纯度的要求。研究结果为含锰废水的资源化回收提供了新思路。 展开更多
关键词 钛白废水 液相沉淀法 碳酸锰 响应面法 回收
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Network-centric medicine for peripheral nerve injury:treating the whole to boost endogenous mechanisms of neuroprotection and regeneration 预览
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作者 David Romeo-Guitart Caty Casas 《中国神经再生研究:英文版》 SCIE CAS CSCD 2019年第7期1122-1128,共7页
Peripheral nerve injuries caused by accidents may lead to paralysis,sensory disturbances,anaesthesia,and lack of autonomic functions.Functional recovery after disconnection of the motoneuronal soma from target tissue ... Peripheral nerve injuries caused by accidents may lead to paralysis,sensory disturbances,anaesthesia,and lack of autonomic functions.Functional recovery after disconnection of the motoneuronal soma from target tissue with proximal rupture of axons is determined by several factors:motoneuronal soma viability,proper axonal sprouting across inhibitory zones and elongation toward specific muscle,effective synapse contact rebuilding,and prevention of muscle atrophy.Therapies,such as adjuvant drugs with pleiotropic effects,that promote functional recovery after peripheral nerve injury are needed.Toward this aim,we designed a drug discovery workflow based on a network-centric molecular vision using unbiased proteomic data and neural artificial computational tools.Our focus is on boosting intrinsic capabilities of neurons for neuroprotection;this is in contrast to the common approach based on suppression of a pathobiological pathway known to be associated with disease condition.Using our workflow,we discovered neuroheal,a combination of two repurposed drugs that promotes motoneuronal soma neuroprotection,is anti-inflammatory,enhances axonal regeneration after axotomy,and reduces muscle atrophy.This drug discovery workflow has thus yielded a therapy that is close to its clinical application. 展开更多
关键词 MOTONEURON NEURODEGENERATION AXONAL REGENERATION muscle ATROPHY systems biology neuroheal PI3K/AKT SIRTUIN 1 motor function recovery
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Effects of Seaweed Extracts on Promoting Growth and Improving Stress Resistance in Sugarcane 预览
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作者 Diwen CHEN Ying HUANG +6 位作者 Dachun SHEN Wenling ZHOU Junhua AO Yong JIANG Zhenrui HUANG Hassan Munir Fahd Rasul 《亚洲农业研究:英文版》 2019年第4期69-72,76共5页
A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality at... A field investigation was executed in sugarcane producing area of Zhanjiang,Guangdong Province with YT03-373 as the test variety to understand the possible impacts of seaweed extracts on phenology,yield and quality attributes of sugarcane. Foliar application of seaweed extracts were carried out on sugarcane at seedling and tillering stages. Agronomic traits,yield,sugar content,leaf drought resistance and pest resistance of sugarcane were analyzed for optimization of application time at proper phenological stages. The results that compared to the control,the application of seaweed extracts at different stages of sugarcane enhanced production of sugarcane with increase rate of 10. 83%-12. 87%,and improved theoretical sugar yield of sugarcane up to 1. 9 t/ha while enhancing water retention capacity and water content of sugarcane leaves that consequently led to wilting risk reduction by escaping drought and improved resilience to drought impact on sugarcane. Seaweed extracts also performed excellent in pest management of sugarcane,and they exerted different control effects on sugarcane borers,aphids and thrips. An increase in output of sugarcane was observed to be 15. 09% compared to control,while the net income was improved by up to 32. 64% in the seaweed extracts application treatment. Foliar application of seaweed extracts not only enhanced growth,cold resistance,pest resistance,output value but also improved economic returns,giving a positive affirmation for the recommendation of seaweed extract application. 展开更多
关键词 SEAWEED extracts FOLIAR application SUGAR recovery DROUGHT RESISTANCE Pest RESISTANCE
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Exogenous neural stem cell transplantation for cerebral ischemia 预览
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作者 Ling-Yi Liao Benson Wui-Man Lau +1 位作者 Dalinda Isabel Sánchez-Vida?a Qiang Gao 《中国神经再生研究:英文版》 SCIE CAS CSCD 2019年第7期1129-1137,共9页
Cerebral ischemic injury is the main manifestation of stroke,and its incidence in stroke patients is 70–80%.Although ischemic stroke can be treated with tissue-type plasminogen activator,its time window of effectiven... Cerebral ischemic injury is the main manifestation of stroke,and its incidence in stroke patients is 70–80%.Although ischemic stroke can be treated with tissue-type plasminogen activator,its time window of effectiveness is narrow.Therefore,the incidence of paralysis,hypoesthesia,aphasia,dysphagia,and cognitive impairment caused by cerebral ischemia is high.Nerve tissue regeneration can promote the recovery of the aforementioned dysfunction.Neural stem cells can participate in the reconstruction of the damaged nervous system and promote the recovery of nervous function during self-repair of damaged brain tissue.Neural stem cell transplantation for ischemic stroke has been a hot topic for more than 10 years.This review discusses the treatment of ischemic stroke with neural stem cells,as well as the mechanisms of their involvement in stroke treatment. 展开更多
关键词 nerve REGENERATION STEM CELL therapy NEURAL STEM cells CELL transplantation ischemic stroke cerebral ischemia NEUROPLASTICITY functional recovery NEURAL REGENERATION
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从铅锌废渣中氨浸锌试验研究 预览
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作者 石振武 杨守洁 薛群虎 《湿法冶金》 CAS 北大核心 2019年第4期271-275,286共6页
研究了采用氨浸法从铅锌废渣中回收锌,以及用溶剂蒸发法制备碱式碳酸锌,考察了浸出温度、浸出时间、总氨浓度和液固体积质量比对锌浸出率的影响。结果表明:影响锌浸出率的因素排序为液固体积质量比>浸出时间>浸出温度>总氨浓度... 研究了采用氨浸法从铅锌废渣中回收锌,以及用溶剂蒸发法制备碱式碳酸锌,考察了浸出温度、浸出时间、总氨浓度和液固体积质量比对锌浸出率的影响。结果表明:影响锌浸出率的因素排序为液固体积质量比>浸出时间>浸出温度>总氨浓度;在浸出温度30℃、浸出时间2h、总氨浓度4mol/L、液固体积质量比7mL/g适宜条件下,锌浸出率为81.99%;所制备的碱式碳酸锌为无定形状态,化学式为Zn5(CO3)2(OH)6·2H2O。 展开更多
关键词 铅锌废渣 氨浸 回收
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Fish Assemblage Responses to a Low-head Dam Removal in the Lancang River 预览
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作者 DING Chengzhi JIANG Xiaoming +11 位作者 WANG Lieen FAN Hui CHEN Liqiang HU Jinming WANG Hailong CHEN Yifeng SHI Xiaotao CHEN Hao PAN Bohui DING Liuyong ZHANG Chao HE Daming 《中国地理科学:英文版》 SCIE CSCD 2019年第1期26-36,共11页
Dam removal is becoming an effective approach for aquatic biodiversity restoration in damming river in order to balance the aquatic ecosystem conservation with large-scale cascade damming. However, the effects of dam ... Dam removal is becoming an effective approach for aquatic biodiversity restoration in damming river in order to balance the aquatic ecosystem conservation with large-scale cascade damming. However, the effects of dam removal on fish communities in Asian mountainous rivers, which are dominated by Cypriniformes fishes, are still not well known. To determine whether dam removal on a mountainous river benefit restoration of fish diversity, we investigated the response of fish assemblage to dam removal using a before-after-control-impact design in two tributaries of the Lancang River(dam removal river: the Jidu River, and control river: the Fengdian River). Fish surveys were conducted one year prior to dam removal(2012) and three years(2013–2015) following dam removal. We observed rapidly and notably spatio-temporal changes in fish biodiversity metrics and assemblage structure, occurring in the Jidu River within the first year after dam removal. Overall, fish species richness, density and Shannon-Wiener diversity all increased immediately in above-and below-dam sites, and maintained a stable level in subsequent years, compared to unchanged situation in the control river. All sites in the Jidu River experienced shifts in fish composition after dam removal, with the greatest temporal changes occurred in sites below-and above-the former dam, resulting in a temporal homogenization tendency in the dam removed river. These findings suggest that dam removal can benefit the recovery of habitat conditions and fish community in Asian mountainous rivers, but the results should be further evaluated when apply to other dammed rivers since the dam age, fluvial geomorphology and situation of source populations could all affect the responses of fish assemblages. 展开更多
关键词 fish diversity DAM DEMOLITION HABITAT recovery CYPRINIFORMES international RIVERS
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东胜气田试采井放空气回收工艺研究 预览
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作者 赵鹏飞 《山东化工》 CAS 2019年第13期121-122,共2页
为挖潜增效,最大限度地回收东胜气田试采井放空气,通过回收工艺方案比选,结合放空气排放特点,提出了适用于东胜气田的低成本天然气回收工艺方案,通过经济评价表明东胜气田可采用制CNG回收方案,放空气回收项目回收期短,内部收益率高,风... 为挖潜增效,最大限度地回收东胜气田试采井放空气,通过回收工艺方案比选,结合放空气排放特点,提出了适用于东胜气田的低成本天然气回收工艺方案,通过经济评价表明东胜气田可采用制CNG回收方案,放空气回收项目回收期短,内部收益率高,风险较低。 展开更多
关键词 东胜气田 放空气 回收 工艺 经济评价
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磨矿环境对方铅矿浮选行为的影响研究 预览
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作者 江宏强 李茂林 +2 位作者 崔瑞 邓小龙 卢义飞 《矿产综合利用》 CAS 北大核心 2019年第1期141-146,共6页
针对方铅矿单矿物,分别使用瓷罐瓷球与瓷罐铁球磨矿并进行浮选,考察磨矿时间、矿浆溶液的酸碱度、捕收剂的用量与方铅矿浮选效果的关系。结果表明,瓷介质磨矿比铁介质磨矿更有利于方铅矿的浮选;高碱环境有利于方铅矿的浮选;捕收剂用量... 针对方铅矿单矿物,分别使用瓷罐瓷球与瓷罐铁球磨矿并进行浮选,考察磨矿时间、矿浆溶液的酸碱度、捕收剂的用量与方铅矿浮选效果的关系。结果表明,瓷介质磨矿比铁介质磨矿更有利于方铅矿的浮选;高碱环境有利于方铅矿的浮选;捕收剂用量越高越有利于方铅矿的浮选;采用铁介质磨矿时,磨矿时间延长,方铅矿浮选回收率降低,而采用瓷介质磨矿,磨矿时间对其影响不大;采用铁介质磨矿,铁介质氧化生成羟基氧化铁覆盖在方铅矿表面,改变了方铅矿表面组成,增加了方铅矿亲水性,对方铅矿的浮选产生负面影响。 展开更多
关键词 方铅矿 磨矿环境 浮选 回收率
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高效液相色谱法测定S-诱抗素及对其设计浓度验证 预览
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作者 姚晨涛 刘铭钰 +3 位作者 孙晓 贾芳莹 彭宇漩 姜兴印 《现代农药》 CAS 2019年第3期32-35,共4页
建立了S-诱抗素的高效液相色谱检测方法,采用Pgrandsil-STC-C18分离,紫外检测器检测,以甲醇+甲酸水溶液为流动相,在260nm波长条件下测定S-诱抗素质量分数。在质量浓度为1.0~100.0mg/L时,S-诱抗素线性关系良好,回收率为100.08%~100.40%,... 建立了S-诱抗素的高效液相色谱检测方法,采用Pgrandsil-STC-C18分离,紫外检测器检测,以甲醇+甲酸水溶液为流动相,在260nm波长条件下测定S-诱抗素质量分数。在质量浓度为1.0~100.0mg/L时,S-诱抗素线性关系良好,回收率为100.08%~100.40%,标准偏差为0.08~3.33,变异系数为0.88。98%S-诱抗素原药对藻类生长抑制试验、溞类急性活动抑制试验和鱼类急性毒性试验结果表明供试物的实测浓度均不低于设计浓度的80%,可用设计浓度计算EC50值和LC50值。 展开更多
关键词 S-诱抗素 高效液相色谱法 回收率 水生生物
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Softening and recrystallization behavior of a new class of ferritic steel
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作者 Xiang-yu Xu Jian-zhe Li +4 位作者 Xue-min Wang Wei Zhang Qian-nan Liu Cheng-jia Shang R.D.K.Misra 《钢铁研究学报:英文版》 SCIE EI CAS CSCD 2019年第2期154-161,共8页
In order to clarify the recrystallization mechanism of low-densityδ-ferrite steel Fe-4AI-2Ni,interrupted and single-pass compression tests were carried out.In this regard,five deformation temperatures(750-950 at an i... In order to clarify the recrystallization mechanism of low-densityδ-ferrite steel Fe-4AI-2Ni,interrupted and single-pass compression tests were carried out.In this regard,five deformation temperatures(750-950 at an interval of 50°C)and different hold time were selected.It was observed that the softening and recrystallization fraction was enhaneed with increased deformation temperature and hold time.The original grain bounclaries were the preferred nucleation sites for recrystallized grains,and recrystallization had an impact on obtaining homogeneous and fine-grained structure.Recrystallization in the ferritic alloy commenced after a significant degree of softening,and the softening associated with recovery was appreciably less.The optimum rolling deformation temperature was identified to be greater than 900°C. 展开更多
关键词 Δ-FERRITE steel Interrupted compression test RECOVERY RECRYSTALLIZATION
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