四路通住宅小区A区(山水文园三期)设计

整个山水文园项目包括已经建成的山水文园一、二期及四路通住宅小区。四路通住宅小区东临东四环隔离绿化带；北侧以弘燕路为界：西侧是一条从西北到东南走向的河流——萧太后河：南侧是一些现状用地。由于萧太后河和东四环路有一定交角．因此整个地块有点像一个倒三角形。在小区的中部一条L形的城市支路将小区自然分成A、B两个地块。     

氧含量对TC4 ELI钛合金棒材组织及力学性能的影响

采用自主制备的两种氧含量的TC4合金铸锭,通过开坯-锻造-退火等工艺制备出间隙元素含量远远低于GB/T 13810-2017及UNS R56401要求,性能优异的TC4 ELI钛合金棒材.通过化学分析、金相显微镜、拉伸试验和扫描电镜研究其性能,结果表明,经过开坯-锻造-退火,钛合金棒材氧氮氢等间隙元素含量较铸锭有较明显...     

基于阶跃激励稳态响应的感应电机匝间短路故障诊断方法研究

针对感应电机匝间短路故障,提出了一种基于阶跃激励稳态响应的故障诊断方法,并开展了理论与实验分析.首先,针对单相激励下电机不同绕组发生短路的情况,开展了对应电路网络的分析,推导了阶跃响应下电流的解析方程.其次,分析了故障对通路、支路电流阶跃稳态数值的影响,探究了特征矢量空间位置的移动规律.再次,提出了基于阶跃激励稳态响应...     

纳米材料在食品储藏领域应用的研究进展

近年来纳米材料发展迅速,由于其具有易加工、韧性强、能吸附和抑菌活性强等优良特性,在果疏等食品保鲜方面应用广泛。本文从纳米材料的制备及特性,人参、蔬菜和水果等食品的纳米涂膜复合保鲜和纳米包装材料保鲜等方面进行综述,通过与普通保鲜材料对比发现了纳米涂膜保鲜材料和纳米包装保鲜材料的强抑菌活性、高抗氧化活性、高V_C和叶绿素保持率、低失重率、绿色环保、易降解和抑制木质化劣变现象等优势。纳米保鲜材料主要通过形成高CO₂高湿和低O₂的环境,减弱呼吸作用,降低食品腐烂率,延长食品货架期。此外纳米保鲜材料还存在纳米迁移和细胞毒性等问题,未来要加强对纳米材料的安全性能评价,期望本文为纳米材料在人参等食品保鲜中的应用提供科技支撑。     

中国饲料成分及营养价值表

以稻花香、长粒香、赣晚籼40号3种稻谷米糠为原料,探究蒸汽爆破对不同品种稻谷米糠可溶性膳食纤维的影响。应用傅里叶变换红外光谱、X射线衍射和扫描电镜探究蒸汽爆破对米糠SDF结构的影响;以持水力、持油力、吸附胆固醇能力、吸附葡萄糖能力、α-淀粉酶活性抑制能力及抗氧化能力为评价指标,研究蒸汽爆破对米糠SDF功能特性的影响。结果表明,蒸汽爆破使米糠SDF红外光谱中部分吸收峰的吸收强度增加、结晶度降低、结构疏松多孔;稻花香、长粒香、赣晚籼40号稻谷米糠经汽爆后其SDF的含量较其对照分别增加了87.22%、94.72%、70.31%;3种蒸汽爆破米糠SDF的持水性、持油性、在人体胃液环境下吸附胆固醇能力、吸附葡萄糖能力以及对ABTS⁺·、·OH清除率和总抗氧化能力较其对照均显著增加（P<0.05）;蒸汽爆破长粒香和赣晚籼40号米糠SDF对α-淀粉酶活性的抑制能力较其对照分别增加了7.60%和21.72%。蒸汽爆破稻花香米糠SDF的持水力、吸附胆固醇的能力较强（pH2）以及对DPPH·的清除率最高,分别达到1.06 g/g、43.93 μmol/g和14.25%,而蒸汽爆破长粒香米糠SDF的持油力、对α-淀粉酶活性抑制能力和总抗氧化能力最高,分别达到4.02 g/g、86.53%和3.82 μmol/g;蒸汽爆破赣晚籼40号米糠SDF吸附葡萄糖的能力和对ABTS⁺·、·OH清除率较强,分别达到625.16 mg/g、98.26%和27.85%。综上,蒸汽爆破使3种米糠SDF的含量增加,功能特性较其对照得到改善,但3个蒸汽爆破品种米糠SDF的功能特性存在明显差异。

     

Lateral epitaxial growth of two-dimensional heterostructure linked by gold adatoms

Lateral two-dimensional(2D)heterostructures have great potential for device engineering at the atomistic scale.Their production is hindered by difficulties in obtaining atomically sharp interface free from intermixture.Here we report the continuous construction of a lateral heterostructure using blue phosphorene and tetrafluoro-tetracyanoquinodimethane(F₄TCNQ)as the building blocks.The lateral heterostructure is achieved by linking the semiconducting F₄TCNQ-Au metal organic framework and the metallic blue phosphorene-Au network via Au adatoms.The structural and electronic properties of the heterostructure have been investigated by means of scanning tunneling microscopy and spectroscopy(STM/S),complemented by density functional theory(DFT)calculations,demonstrating a structurally and electrically abrupt interface.Our approach offers the possibility of high flexibility and control that can be extended to other metal-organic species and 2D materials,establishing a foundation for the development of atomically thin in-plane superlattice and devices.     

右旋糖酐/蚕豆蛋白复合体系的流变及功能特性

该文以右旋糖酐（dextran,L12）和蚕豆蛋白（faba bean protein isolate,FPI）为原料,探究L12 浓度（1%、4%）对FPI-L12 复合体系流变及功能特性的影响。与纯蛋白对照组相比,流变学性质结果表明,随着L12 浓度增加,FPIL12 复合体系的表观黏度、黏弹性模量和滞后面积逐渐增大;功能特性结果表明,当L12 的浓度为4%时,FPI-L12 复合体系的乳化活性（emulsifying activity index,EAI）、乳化稳定性（emulsion stability index,ESI）、泡沫稳定性（foam stability,FS）分别增加至（47.47±1.77）m2/g、（92.64±4.62）%和（92.82±1.98）%,而起泡性（foamability,FA）在添加1%的L12时最高,为（92.00±2.16）%,且添加4%L12 时FA 低于对照组。此外,添加1%L12 使FPI-L12 复合体系的胶凝温度从86.43 ℃显著降低至56.20 ℃,而添加4%L12 复合体系的弹性模量（G′）与黏性模量（G″）无交点并且随着L12 浓度的升高,FPI-L12 复合凝胶的黏弹性模量逐渐增大。该研究为拓展FPI-L12 复合体系在食品中的应用提供理论依据。     

In-situ TEM observation of the evolution of helium bubbles &dislocation loops and their interaction in Pd during He+ irradiation

The microstructural evolution of purity Pd under 30 keV He+ irradiation at 573 K was investigated by in-situ transmission electron microscopy.The nucleation,growth,merging,annihilation,size change,number density variation,and types of dislocation loops were analyzed under the influence of irradiation fluence and sample thickness.Both perfect dislocation loops with b =1/2 < 110> and faulted dislocation loops with b =1/3 < 111> were formed.However,at low irradiation fluence,most of the loops were 1/3< 111> loops.The thickness of TEM foil obviously affected the ratio of 1 /3 < 111 > loop variants,the size and number density of dislocation loops,and the characteristics of bubble-loop complexes.With the increase of irradiation fluence,the size of dislocation loops increased,but loop volume number density remained almost constant until dislocation loops merged and evolved into dislocation network.There was an obvious interaction between dislocation loops and bubbles,indicating that 1 /3 < 111 > loop was first formed at the initial stage of irradiation,and when the loop grew to a certain size,obvious helium bubbles appeared inside its region.     

钢铁化学酸洗除锈清洁生产过程

文章简要阐述钢铁酸洗工艺过程,分析产污环节,指出污染的关键所在。通过初步经济衡算得出,添加酸洗抑雾剂和酸洗缓蚀剂可以节约酸洗原料的投入,减少产品的腐蚀量,减少污染物的排放。通过分析认为酸洗过程添加抑雾剂和缓蚀剂具有良好的环境经济效益。开展钢铁酸洗清洁生产,改革生产工艺,加强生产管理,采用始端预防技术替代末端治理具有良好的经济效益。