Efficient and rapid capture of uranium(Ⅵ) in wastewater via multiamine modified β-cyclodextrin porous polymer

It is quite important to ensure the safety and sustainable development of nuclear energy for the treatment of radioactive wastewater. To treat radioactive wastewater efficiently and rapidly, two multi-amine β-cyclodextrin polymers(diethylenetriamine β-cyclodextrin polymer(DETA-TFCDP) and triethylenetetramine β-cyclodextrin polymer(TETA-TFCDP)) were prepared and applied to capture uranium. Results exhibited that DETA-TFCDP and TETA-TFCDP displayed the advantages of high adsorption amounts(612.2and 628.2 mg·g-1, respectively) and rapid adsorption rates, which can reach(88 ± 1)% of their equilibrium adsorption amounts in 10 min. Moreover, the adsorbent processes of DETA-TFCDP and TETATFCDP on uranium(Ⅵ) followed the Langmuir model and pseudo-second-order model, stating they were mainly chemisorption and self-endothermic. Besides, TETA-TFCDP also showed excellent selectivity in the presence of seven competing cations and could be effectively reused five times via Na2CO3as the desorption reagent. Meanwhile, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy illustrated that the enriched multi-amine groups and oxygen-containing functional groups on the surface of TETA-TFCDP were the main active sites for capturing uranium(Ⅵ). Hence, multi-amine β-cyclodextrin polymers are a highly efficient, rapid, and promising adsorbent for capturing uranium(Ⅵ)from radioactive wastewater.

海藻酸钠基凝胶吸附材料对Cr(VI)吸附性能研究

海藻酸钠(SA)是一种天然生物质材料,其来源广、价格低,聚乙烯亚胺是一种含有氨基(-NH_(2))的水溶性高分子聚合物,螯合重金属离子能力强,众多研究者将二者结合其制备成吸附剂去除水溶液中的金属离子。本研究以海藻酸钠为基体,加入碳酸钙和聚乙烯亚胺,以戊二醛为交联剂,经冷冻干燥后形成吸附较好的海藻酸钠-聚乙烯亚胺吸附材料。采用吸附实验研究了材料对水中Cr(VI)的吸附性能,并研究初始浓度、溶液pH、吸附时间、吸附剂用量等对吸附效果的影响。实验结果表明:在Cr(VI)溶液初始浓度为15 mg/L、吸附剂用量0.4 g、吸附时间200 min,吸附温度为313 K时,Cr(VI)去除率达90%以上。

应用型背景下标志与VI设计课程实施课程思政的路径研究

全面推进课程思政建设是落实立德树人根本任务的战略举措。为适应新时代对课程思政高质量发展的要求,该文基于高校“三全育人”工作需求,在应用型背景下,探索课程思政元素有机融入艺术设计类专业课程的路径。针对标志与VI设计课程,首先根据神经语言程序学者罗伯特·迪尔茨关于人的认知的六个层次理论,设计课程思政元素体系,进而通过详细解读和挖掘六种层次描述课程思政元素体系的设计思路,最后提出从五个讲授部分和三个实践部分,在课程实施过程中融入课程思政元素的具体策略和路径,以期促进艺术设计类专业教学与课程思政有机融合,充分发挥课程思政在高校艺术设计类专业课程中的育人作用,为标志与VI设计课程的思政教学设计与教学改革提供参考。

电纺丝制备磁性单晶BiFeO_(3)纳米纤维并用于Cr(VI)的可见光催化还原

本工作提出一种将溶胶凝胶与静电纺丝结合的分步快速烧结技术,成功制备了单晶BiFeO_(3)纳米纤维。通过热重差热分析(TG-DTG)、XRD、SEM、TEM、EDS、紫外可见漫反射光谱和氮气吸附脱附曲线等测试对所制备材料的结构和形貌进行表征。同时,考察了BiFeO_(3)纳米纤维在可见光下对水中Cr(VI)的光催化还原性能。结果显示,相比于传统方式制备的纳米颗粒,该材料因更大的比表面积而具有更高的光催化活性。空穴消耗剂酒石酸的加入能够促进该材料对Cr(VI)的光催化还原反应,使还原效率提高87%。总之,本文制备的BiFeO_(3)材料能在可见光下响应,并在常温下具有弱磁性,能通过磁场力回收,在环境净化领域具有广阔的应用前景。

Permeability evolution mechanism and the optimum permeability determination of uranium leaching from low-permeability sandstone treated with low-frequency vibration

Low-frequency vibrations can effectively improve natural sandstone permeability,and higher vibration frequency is associated with larger permeability.However,the optimum permeability and permeability evolution mechanism for uranium leaching and the relationship between permeability and the change of chemical reactive rate affecting uranium leaching have not been determined.To solve the above problems,in this study,identical homogeneous sandstone samples were selected to simulate lowpermeability sandstone;a permeability evolution model considering the combined action of vibration stress,pore water pressure,water flow impact force,and chemical erosion was established;and vibration leaching experiments were performed to test the model accuracy.Both the permeability and chemical reactions were found to simultaneously restrict U6þleaching,and the vibration treatment increased the permeability,causing the U6þleaching reaction to no longer be diffusion-constrained but to be primarily controlled by the reaction rate.Changes of the model calculation parameters were further analyzed to determine the permeability evolution mechanism under the influence of vibration and chemical erosion,to prove the correctness of the mechanism according to the experimental results,and to develop a new method for determining the optimum permeability in uranium leaching.The uranium leaching was found to primarily follow a process consisting of(1)a permeability control stage,(2)achieving the optimum permeability,(3)a chemical reactive rate control stage,and(4)a channel flow stage.The resolution of these problems is of great significance for facilitating the application and promotion of lowfrequency vibration in the CO_(2)+O_(2) leaching process.

Assessment of the Greenhouse Gas Footprint and Environmental Impact of CO_(2)and O_(2)in situ Uranium Leaching

Under the new development philosophy of carbon peaking and carbon neutrality,CO_(2)and O_(2)in situ leaching(ISL)has been identified as a promising technique for uranium mining in China,not only because it solves carbon dioxide utilization and sequestration,but it also alleviates the environmental burden.However,significant challenges exist in assessment of CO_(2)footprint and water-rock interactions,due to complex geochemical processes.Herein this study conducts a three-dimensional,multicomponent reactive transport model(RTM)of a field-scale CO_(2)and O_(2)ISL process at a typical sandstone-hosted uranium deposit in Songliao Basin,China.Numerical simulations are performed to provide new insight into quantitative interpretation of the greenhouse gas(CO_(2))footprint and environmental impact(SO_(4)^(2–))of the CO_(2)and O_(2)ISL,considering the potential chemical reaction network for uranium recovery at the field scale.RTM results demonstrate that the fate of the CO_(2)could be summarized as injected CO_(2)dissolution,dissolved CO_(2)mineralization and storage of CO_(2)as a gas phase during the CO_(2)and O_(2)ISL process.Furthermore,compared to acid ISL,CO_(2)and O_(2)ISL has a potentially smaller environmental footprint,with 20%of SO_(4)^(2–)concentration in the aquifer.The findings improve our fundamental understanding of carbon utilization in a long-term CO_(2)and O_(2)ISL system and provide important environmental implications when considering complex geochemical processes.

基于VI视觉识别系统的饲料品牌策划

VI视觉识别系统是具有统一性、系统性的视觉符号系统,在饲料品牌策划中能起到树立品牌形象,扩大品牌知名度和影响力,增强品牌信任感等显著效果,所以能为饲料品牌发展提供有力支撑。而在应用VI视觉识别系统的过程中,要注意把握好饲料品牌策划的原则,力求通过标志设计、标准色设计、包装设计以及信息推广等途径不断优化饲料品牌策划方案,确保饲料品牌能在激烈的市场竞争中脱颖而出,以良好的品牌为饲料企业带来溢价效应和增值效应。

Efficient removal of U(VI) from wastewater by a sponge-like 3D porous architecture with hybrid electrospun nanofibers

Removal of uranium(VI)from nuclear wastewater is urgent due to the global nuclear energy exploitation.This study synthesized novel sponge-like 3D porous materials for enhanced uranium adsorption by combining electrospinning and fibrous freeze-shaping techniques.The materials possessed an organic-inorganic hybrid architecture based on the electrospun fibers of polyacrylonitrile(PAN)and SiO_(2).As a sup-porting material,the surface of fibrous SiO_(2) could be further functionalized by cyano groups via(3-cyanopropyl)triethoxysilane.All the cyano groups were turned into amidoxime(AO)groups to obtain a amidoxime-functionalized sponge(PAO/SiO_(2)-AO)through the subsequent ami-doximation process.The proposed sponge exhibited enhanced uranium adsorption performance with a high removal capacity of 367.12 mg/g,a large adsorption coefficient of 4.0×10^(4)mL/g,and a high removal efficiency of 97.59%.The UO_(2)^(2+)adsorption kinetics perfectly conformed to the pseudo-second-order reaction.The sorbent also exhibited an excellent selectivity for UO_(2)^(2+) with other interfering metal ions.2023 Hohai University.Production and hosting by Elsevier B.V.

VI创意设计提升奢侈品皮具品牌影响力探析

随着社会经济的发展,VI的创意设计对于品牌影响力的作用越来越受到品牌方和消费者的重视。如何通过VI创意设计来提升奢侈品皮具品牌的影响力也是一个值得探讨的过程。本文从VI的概念、VI创意设计在奢侈品皮具中的表现形式和如何提升奢侈品皮具品牌的影响力等方面进行分析,以达到抛砖引玉的作用。

Effective Elimination of Hazardous Chromium (VI) Using Periodic Elements and Contemporary Adsorption Methods by Using Magnesium Ferrite Nanoparticle: A Review

A well-known hazardous metal and top contaminant in wastewater is hexavalent chromium. The two forms of most commonly found chromium are chromate ( CrO 4 2− ) and dichromate ( Cr 2 O 7 2− ). Leather tanning, cooling tower blow-down, plating, electroplating, rinse water sources, anodizing baths etc. are the main sources of Cr (VI) contamination. The Cr (VI) is not only non-biodegradable in the environment but also carcinogenic to living population. It is still difficult to treat Cr contaminated waste water effectively, safely, eco-friendly, and economically. As a result, many techniques have been used to treat Cr (VI)-polluted wastewater, including adsorption, chemical precipitation, coagulation, ion-exchange, and filtration. Among these practices, the most practical method is adsorption for the removal of Cr (VI) from aqueous solutions, which has gained widespread acceptance due to the ease of use and affordability of the equipment and adsorbent. It has been revealed that Fe-based adsorbents’ oxides and hydroxides have high adsorptive potential to lower Cr (VI) content below the advised threshold. Fe-based adsorbents were also discovered to be relatively cheap and toxic-free in Cr (VI) treatment. Fe-based adsorbents are commonly utilized in industry. It has been discovered that nanoparticles of Fe-, Ti-, and Cu-based adsorbents have a better capacity to remove Cr (VI). Cr (VI) was effectively removed from contaminated water using mixed element-based adsorbents (Fe-Mn, Fe-Ti, Fe-Cu, Fe-Zr, Fe-Cu-Y, Fe-Mg, etc.). Initial findings suggest that Cr (VI) removal from wastewater may be accomplished by using magnesium ferrite nanomaterials as an efficient adsorbent.

Apatite Fission Track Thermochronology of Granite from the Xiazhuang Uranium Ore Field,South China:Implications for Exhumation History and Ore Preservation

Xiazhuang uranium ore field,located in the southern part of the Nanling Metallogenic Belt,is considered one of the largest granite-related U regions in South China.In this paper,we contribute new apatite fission track data and thermal history modeling to constrain the exhumation history and evaluate preservation potential of the Xiazhuang Uranium ore field.Nine Triassic outcrop granite samples collected from different locations of Xiazhuang Uranium ore field yield AFT ages ranging from 43 to 24 Ma with similar mean confined fission track lengths ranging from 11.8±2.0 to 12.9±1.9μm and Dpar values between 1.01 and 1.51μm.The robustness time-temperature reconstructions of samples from the hanging wall of Huangpi fault show that the Xiazhuang Uranium ore field experienced a time of monotonous and slow cooling starting from middle Paleocene to middle Miocene(~60-10 Ma),followed by relatively rapid exhumation in the late Miocene(~10-5 Ma)and nearly thermal stability in the Pliocene-Quaternary(~5-0 Ma).The amount of exhumation after U mineralization since the Middle Paleogene was estimated as~4.3±1.8 km according to the integrated thermal history model.Previous studies indicate that the ore-forming ages of U deposits in the Xiazhuang ore field are mainly before Middle Paleocene and the mineralization depths are more than 4.4±1.2 km.Therefore,the exhumation history since middle Paleocene plays important roles in the preservation of the Xiazhuang Uranium ore field.

乡村振兴战略背景下“VI设计与制作”课程思政教学探索与实践——以农产品包装设计项目为例

2023年中央一号文件《中共中央国务院关于做好2023年全面推进乡村振兴重点工作的意见》中提到实施文化产业赋能乡村振兴计划,如何引领乡村产业发展,推动乡村振兴战略,提升农产品消费引力,成为业界关注的热点。产品包装设计是品牌形象的直接展示,对于农产品的品牌打造、提档升级、促进销售有着重要作用。本文以农产品包装设计项目为例,探究如何将思政元素融入到“VI设计与制作”课程中,以创意设计赋能新农村建设为切入,让设计助力乡村振兴,提升学生服务国家乡村振兴的意识,实现培养“重民生、强素质、懂设计、会创新”的人才目标。

多媒体时代“VI设计”课程教学创新研究

“VI设计”课程是视觉传达设计专业的专业核心课程。传统VI设计以企业或品牌的基础系统和应用系统设计为主,随着多媒体技术时代的涌入,VI设计着重以品牌形象塑造为设计理念,通过品牌元素与IP形象等应用延展,树立品牌意识和观念。分析了“VI设计”课程教学存在的问题,阐述了“VI设计”课程教学创新策略。

Mark VIe控制系统在燃驱压缩机组控制系统升级改造中的应用

针对当前集成了不同厂家几套子系统的一些燃驱压缩机组控制系统结构复杂、维护成本高等问题,应用基于Mark VIe控制平台来升级改造该系统。以某改造项目为例,应用双冗余Mark VIe控制系统架构,Mark VIe SIL3模件作为紧急停机和火气保护系统的硬件,同时采用Mark VIe ControlST统一软件平台。结果表明:新控制系统采用了一体化硬件、软件设计,提高了机组控制系统的安全可靠性,有利于日常运行维护,而且新系统具有在线监测功能,有助于系统故障排查。

沉浸式教学模式的探索实践——以《VI设计》为例

文章首先对沉浸式教学模式的概念进行了阐述,分析了视觉传达专业《VI设计》的教学现状,并论述了沉浸式教学模式在高校教学活动中的探索与实践。具体来说,文章以《VI设计》课程为例,从教师授课内容、学生研究方法、作业成绩评定等方面对沉浸式教学模式展开论述,通过教学模式与沉浸式的结合,探讨了全球数字化背景下高校教学模式的新思路。

本科教育VI设计教学中传统图形融入探索

本科教育VI设计教学中融入传统图形,有助于培养学生创新思维和设计思维,还能培养学生文化意识,传承我国传统文化。基于此,本文分析本科教育VI设计教学中传统图形的艺术表现,探讨本科教育传统图形融入VI设计教学实践流程,并从案例教学、教学方法多样化、学生文化意识培育、小组讨论学习、传统图形的基本信息介绍等方面出发,探索本科教育VI设计教学中传统图形融入策略和方法,旨在提供一些有益参考,提高VI设计教学效率。

民族装饰元素融入品牌VI设计课程的教学改革探析

探讨了品牌VI设计中民族装饰元素的融合方法与表现方式,并将其归纳成了一定的教育改革方法,用于优化目前我国高校品牌VI设计课程中同质化严重、缺乏针对我国场域的独立完整模块的情况。将民族装饰元素作为切入点进行教学改革,以建立更好的知识模块与学科架构。

艺术设计课程中的VI设计课程的教学改革研究

通过推动VI设计课程教学改革,不仅可以培养学生艺术设计实践能力和艺术设计创意思维,还能提升学生艺术设计专业综合素质。基于此。本文阐述艺术设计课程中VI设计课程教学改革价值,分析艺术设计课程中VI设计课程教学改革的现实困境,并从教学资源、理论实践混合式教学、课程设置、项目实践等方面出发,探究艺术设计课程中的VI设计课程的教学改革策略,旨在提供一些有益参考,提高VI设计课程教学效率。

基于项目式教学的中职“VI设计”课程教学内容重构策略研究

“VI设计”课程是中职计算机广告制作专业的一门核心课程。文章作者在分析“VI设计”课程教学现状的基础上,依据计算机广告制作专业工学一体化课程设置方案、广告行业标准和广告设计师岗位需求,以项目式教学为主要教学模式,从增加设计项目类型、融入中华优秀传统文化、优化课程结构体系三个方面提出了“VI设计”课程内容重构的研究创新点。本研究对提高计算机广告制作专业课程教学质量,推动教学改革,培养有文化、有担当、有创新意识的高素质广告设计人才有着重要意义。

Mistreatment during Childbirth: Impact on Maternal Outcomes and Importance of Provider Perspectives

Background: Dying in childbirth is one of the most common causes of death for women. While maternal mortality rates, defined as deaths per 100,000 live births, have been steadily dropping in most countries worldwide, maternal mortality rates have doubled in the United States in the last twenty years. This commentary examines the various contributing factors to this trend. Methods: A literature review was performed using the keywords: maternal mortality, United States, disrespectful maternity care, obstetric violence, provider perspectives, and disparities. Maternal mortality statistics were obtained from the World Health Organization website. Results: Medical factors associated with maternal mortality include increased maternal age and cardiovascular conditions. Social factors include barriers to healthcare access, delays in receiving medical care, reduction in reproductive health services in some states, and non-obstetrical deaths such as accidents, domestic violence, and suicide. Racial inequities and disparities of care are reflected in higher maternal mortality rates for minorities and people of color. Disrespectful maternity care or obstetric violence has been reported worldwide as a factor in delay of lifesaving obstetrical care and reluctance by a pregnant person to access the healthcare system. About one in five US women has reported experiencing mistreatment, varying from verbal abuse to lack of privacy, from coerced procedures to neglect during childbirth. Conclusion: This commentary highlights the importance of inclusion of providers in research on respectful maternity care. Provider burnout, moral distress, limited time, and burden of clinical responsibilities are known challenges to respectful and comprehensive medical care. The association of disrespectful care with poor maternal outcomes needs to be studied. Exploring root causes of disrespectful childbirth care can empower nurses, midwives, and physicians to improve their environment and find solutions to reduce a potential cause of maternal mortality.