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Deep decalcification of factory-provided freezing acidolysis solution to achieveα-high-strength gypsum

Chinese Journal of Chemical Engineering 2024年第5期69卷 143-151页

作者： Wencai Ye Yulu li Yonggang Dong lin Yang yun Yi Jianxin Cao School of Chemistry and Chemical Engineering Guizhou UniversityGuiyang 550025China Engineering Research Center of Efficient Utilization for Industrial Waste Guizhou UniversityGuiyang 550025China Key Laboratory of Guizhou Province for Green Chemical Industry and Clean Energy Technology Guizhou UniversityGuiyang 550025China

The freezing acidolysis solution of the nitric acid-phosphate fertilizer process has a high calcium content,which makes it difficult to produce fine phosphate and high water-soluble phosphate fertilizer ***,based on the potential crystallization principle of calcium sulfate in NH_(4)NO_(3)-H_(3)PO_(4)-H_(2)O,the deep decalcification(*** removal)technology to achieveα-high-strength gypsum originated from freezing acidolysis-solutions has been firstly proposed and ***,calcium can be removed from the factory-provided freezing acidolysis-solution by neutralizing it with ammonia,followed by the addition of ammonium sulfate *** a result,the formation of calcium sulfate in the reaction system undergoes the nucleation and growth of CaSO_(4)·2H_(2)O(DH),as well as its dissolution and crystallization into short columnarα-CaSO_(4)·0.5H_(2)O(α-HH).Remarkably,with the molar ratio of SO_(4)^(2-)/Ca^(2+)at 1.8,the degree of neutralization(NH_(3)/HNO_(3) molar ratio)at 1.7,the reaction temperature of 94℃,and the reaction time of 300 min,the decalcification rate can reach 86.89%,of which the high-strengthα-CaSO_(4)·0.5H_(2)O(α-HH)will be ***,the deep decalcification product meets the standards for the production of fine phosphates and highly water-soluble phosphate ***,the 2 h flexural strength ofα-HH is 5.3 MPa and the dry compressive strength is 36.8 MPa,which is up to the standard of commercialα-HH.

关键词： Nitrophosphate Ammonia neutralization Deep decalcification High-strengthα-hemihydrate gypsum Controlled crystallization at atmospheric pressure

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Co_(3)O_(4)as an efficient passive NO_(x) adsorber for emission control during cold-start of diesel engines

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Chinese Journal of Chemical Engineering 2024年第2期66卷 1-7页

作者： Jinhuang Cai Shijie Hao yun Zhang Xiaomin Wu Zhenguo li huawang Zhao Department of Environmental Science&Engineering College of Chemical EngineeringHuaqiao UniversityXiamen 361021China Wuxi Weifu Environmental Catalysts Co. LtdWuxi 214000China National Engineering Laboratory for Mobile Source Emission Control Technology China Automotive Technology&Research Center Co.Ltd.Tianjin 300300China

The Co_(3)O_(4)nanoparticles,dominated by a catalytically active(110)lattice plane,were synthesized as a low-temperature NO_(x) adsorbent to control the cold start emissions from *** nanoparticles boast a substantial quantity of active chemisorbed oxygen and lattice oxygen,which exhibited a NO_(x) uptake capacity commensurate with Pd/SSZ-13 at 100℃.The primary NO_(x) release temperature falls within a temperature range of 200-350℃,making it perfectly suitable for diesel *** characterization results demonstrate that chemisorbed oxygen facilitate nitro/nitrites intermediates formation,contributing to the NO_(x) storage at 100℃,while the nitrites begin to decompose within the 150-200℃***,lattice oxygen likely becomes involved in the activation of nitrites into more stable nitrate within this particular temperature *** concurrent processes of nitrites decomposition and its conversion to nitrates results in a minimal NO_(x) release between the temperatures of 150-200℃.The nitrate formed via lattice oxygen mainly induces the NO_(x) to be released as NO_(2) within a temperature range of 200-350℃,which is advantageous in enhancing the NO_(x) activity of downstream NH_(3)-SCR catalysts,by boosting the fast SCR reaction *** to its low cost,considerable NO_(x) absorption capacity,and optimal release temperature,Co_(3)O_(4)demonstrates potential as an effective material for passive NO_(x) adsorber applications.

关键词： Emission control Cold-start Low-temperature adsorption Co_(3)O_(4) Nitrate formation

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盛唐集贤学士之文学地位与影响

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厦门大学学报（哲学社会科学版） 2017年第1期67卷 110-118页

作者：胡旭李芸华厦门大学中文系福建厦门361005

唐开元中期崇儒重文,以张说、张九龄等为中心的集贤学士地位崇高,文学活动十分频繁。他们在一定程度上整合了京城文坛,成为文学创作的核心。然而到了开元后期及天宝年间,随着意识形态上的慕道用法,文学之士风光不再,集贤院也不再是文学... 详细信息

唐开元中期崇儒重文,以张说、张九龄等为中心的集贤学士地位崇高,文学活动十分频繁。他们在一定程度上整合了京城文坛,成为文学创作的核心。然而到了开元后期及天宝年间,随着意识形态上的慕道用法,文学之士风光不再,集贤院也不再是文学中心,京城的文学队伍因之而变得松散。集贤学士显赫之时,上与帝王显贵游宴雅集,下与聚集于京师的各地才俊往还酬唱,促进了雅俗诗风的交融,使文学创作向更高的层次推进,于盛唐诗歌声律、风骨兼备特质的形成,意义重大。集贤学士在为文方面普遍崇雅黜浮,强调气益雄浑,对中唐古文运动的影响非常深刻。而且,一些位居中枢的集贤学士,培养、选拔了一批文学新人,为中唐文体文风的变革奠定了基础。盛唐文学的内容、风格及成因,与集贤学士的创作和影响皆有着某种程度的关联。

关键词：集贤学士文学中心雅俗诗风唐文三变

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Intestinal microecological transplantation for a patient with chronic radiation enteritis:A case report

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World Journal of Gastroenterology 2024年第19期30卷 2603-2611页

作者： lin Wang Yan li Yu-Jing Zhang li-hua Peng Department of Gastroenterology and Hepatology The First Medical CenterChinese PLA General HospitalBeijing 100853China Department of Gastroenterology and Hepatology Chinese PLA Medical SchoolBeijing 100853China

BACKGROUND The gut microbiota is strongly associated with radiation-induced gut *** study aimed to assess the effectiveness and safety of intestinal microecological transplantation for treating patients with chronic radiation *** SUMMARY A 64-year-old female with cervical cancer developed abdominal pain,diarrhea,and blood in the stool 1 year after *** electronic colonoscopy was performed to diagnose chronic radiation *** courses of intestinal microecological transplantation and full-length 16S rRNA microbiological analysis were *** patient experienced short-and long-term relief from symptoms without adverse *** 16S rRNA sequencing revealed significant differences in the intestinal flora’s composition between patient and healthy *** bacteria,such as Escherichia fergusonii and Romboutsia timonensis,were more in the *** bacteria such as Faecalibacterium prausnitzii,Fusicatenibacter saccharivorans,Ruminococcus bromii,and Bifidobacterium longum were more in the healthy *** microbiota transplantation resulted in a significant change in the patient's intestinal flora *** composition converged with the donor's flora,with an increase in core beneficial intestinal bacteria,such as Eubacterium rectale,and a decrease in pathogenic *** in the intestinal flora corresponded with the patients'alleviating clinical *** Intestinal microecological transplantation is an effective treatment for relieving the clinical symptoms of chronic radiation enteritis by altering the composition of the intestinal *** study provides a new approach for treating patients with chronic radiation enteritis.

关键词： Chronic radiation enteritis Gut microbial transplantation Intestinal microecology Cancer Quality of life Case report

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Advances in Polysaccharide-Based Microneedle Systems for the Treatment of Ocular Diseases

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Nano-Micro Letters 2024年第12期16卷 233-284页

作者： Qingdong Bao Xiaoting Zhang Zhankun Hao Qinghua li Fan Wu Kaiyuan Wang Yang li Wenlong li hua Gao State Key Laboratory Cultivation Base Shandong Provincial Key Laboratory of OphthalmologyEye Institute of Shandong First Medical UniversityQingdao 266071People’s Republic of China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002People’s Republic of China Eye Hospital of Shandong First Medical University Jinan 250021People’s Republic of China College of Ophthalmology Shandong First Medical UniversityJinan 250000People’s Republic of China Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingapore 119074Singapore

The eye,a complex organ isolated from the systemic circulation,presents significant drug delivery challenges owing to its protective mechanisms,such as the blood-retinal barrier and corneal *** drug administration methods often fail to sustain therapeutic levels and may compromise patient safety and *** microneedles(PSMNs)have emerged as a transformative solution for ophthalmic drug ***,a comprehensive review of PSMNs in ophthalmology has not been published to *** this review,we critically examine the synergy between polysaccharide chemistry and microneedle technology for enhancing ocular drug *** provide a thorough analysis of PSMNs,summarizing the design principles,fabrication processes,and challenges addressed during fabrication,including improving patient comfort and *** also describe recent advances and the performance of various PSMNs in both research and clinical ***,we review the current regulatory frameworks and market barriers that are relevant to the clinical and commercial advancement of PSMNs and provide a final perspective on this research area.

关键词： Ocular delivery Polysaccharide Microneedles Drug administration

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中小学教师新课程适应性实证研究

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基础教育 2016年第2期13卷 82-88页

作者：李运华嘉应学院教育科学学院广东梅州514015

本文采用文献研究法、访谈法和调查法,随机抽取粤、赣、闽2000名中小学教师为样本,考察中小学教师新课程适应性水平。结果表明:(1)中小学教师新课程适应性由"新课程理念适应性、新教材适应性、教学实践适应性和适应能力"四因素组成,经... 详细信息

本文采用文献研究法、访谈法和调查法,随机抽取粤、赣、闽2000名中小学教师为样本,考察中小学教师新课程适应性水平。结果表明:(1)中小学教师新课程适应性由"新课程理念适应性、新教材适应性、教学实践适应性和适应能力"四因素组成,经探索性因素分析与验证性因素分析,表明中小学教师新课程适应性的内涵结构具有良好的信度和效度;(2)中小学教师基本能适应新课程,其中新课程理念适应性、教学实践适应性水平较高,新教材适应性处于中等水平,新课程适应能力水平较低;(3)影响中小学教师新课程适应性的主要因素有教师自身素质、教师主观努力和学校。

关键词：基础教育新课程适应性课程改革教师素质

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大学生创业意识实证研究——以广东11所高校为例

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武汉理工大学学报（社会科学版） 2013年第1期26卷 145-151页

作者：李运华广东省嘉应学院教育科学学院广东梅州514015

采用"当代大学生创业意识量表"和调查问卷,在2 053名大学生中考察了大学生创业意识。结果表明:大学生创业意识水平较高,但属于被动型创业意识;地方和重点高校、高低年级、男女生、不同专业学生等不同群体大学生的创业意识具有不同特点;... 详细信息

采用"当代大学生创业意识量表"和调查问卷,在2 053名大学生中考察了大学生创业意识。结果表明:大学生创业意识水平较高,但属于被动型创业意识;地方和重点高校、高低年级、男女生、不同专业学生等不同群体大学生的创业意识具有不同特点;高校对大学生创业意识影响作用很小,创业教育不尽人意。调研表明,各高校应发挥创业教育的主动性,设置特色创业教育内容,开发创业教育途径,提高创业教育成效。

关键词：大学生创业意识特征创业教育

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Machine learning for prediction of retained austenite fraction and optimization of processing in quenched and partitioned steels

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Journal of Iron and Steel Research International 2024年第8期31卷 2002-2013页

作者： Shuai Wang Jie li li-yang Zeng Xun-wei Zuo Nai-lu Chen Yong-hua Rongg Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The metastable retained austenite(RA)plays a significant role in the excellent mechanical performance of quenching and partitioning(Q&P)steels,while the volume fraction of RA(V_(RA))is challengeable to directly predict due to the complicated relationships between the chemical composition and process(like quenching temperature(Qr)).A Gaussian process regression model in machine learning was developed to predict V_(RA),and the model accuracy was further improved by introducing a metallurgical parameter of martensite fraction(fo)to accurately predict V_(RA) in Q&P *** developed machine learning model combined with Bayesian global optimization can serve as another selection strategy for the quenching temperature,and this strategy is very effcient as it found the"optimum"Qr with the maximum V_(RA) using only seven consecutive *** benchmark experiment also reveals that the developed machine learning model predicts V_(RA) more accurately than the popular constrained carbon equilibrium thermodynamic model,even better than a thermo-kinetic quenching-partitioning-tempering-local equilibrium model.

关键词： Q&P steel Retained austenite fraction Machine learning Quenching temperature Gaussian process regression model

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Recent progress of Pt-based oxygen reduction reaction catalysts for proton exchange membrane fuel cells

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Rare Metals 2024年第6期43卷 2444-2468页

作者： Feng Zhan Kun-Song Hu Jin-hua Mai li-Sheng Zhang Zhen-Guo Zhang huan He Xin-hua liu School of Resources Environment and MaterialsGuangxi UniversityNanning530004China School of Transportation Science and Engineering Beihang UniversityBeijing 102206China IDTECH(Suzhou)Co.Ltd Suzhou 215217China Dyson School of Design Engineering Imperial College LondonLondon SW72AZUK

With the increasing consumption of fossil fuels,proton exchange membrane fuel cells(PEMFCs)have attracted considerable attention as green and sustainable energy conversion *** slow kinetics of the cathodic oxygen reduction reaction(ORR)has a major impact on the performance of PEMFCs,and although platinum(Pt)can accelerate the reaction rate of the ORR,the scarcity and high cost of Pt resources still limit the development of ***,the development of low-cost high-performance ORR catalysts is essential for the commercial application and development of *** paper reviews the research progress of researchers on Pt-based ORR catalysts in recent years,including Pt/C catalysts,Pt-based alloy catalysts,Pt-based intermetallic compounds,and Pt-based single-atom catalysts(SACs),with a focus on Pt-based alloy catalysts with different *** described in detail the difficulties and solutions in the research process of various ORR catalysts and explained the principle of their activity enhancement with density functional theory(DFT).In addition,an outlook on the development of Pt-based catalysts is given,and reducing the amount of Pt used and improving the performance of catalysts are the directions to work on in the coming period.

关键词： Pt-based catalysts PEMFCs Pt-based intermetallic compounds Single-atom catalysts

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Gastric metastasis of small cell lung carcinoma:Three case reports and review of literature

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World Journal of Gastroenterology 2024年第31期30卷 3717-3725页

作者： Shan Yang Qing-yun He Qing-Jing Zhao Han-Tao Yang Zheng-Yi Yang Wen-Yi Che hua-Mei li Hui-Chao Wu Department of Gastroenterology The Affiliated Hospital of Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina Department of Gastroenterology Guizhou Hospital of The First Affiliated HospitalSun Yat-sen UniversityGuiyang 550000Guizhou ProvinceChina Department of Gastroenterology Zhejiang Provincial People's Hospital Bijie HospitalBijie 551700Guizhou ProvinceChina Department of Gastroenterology Zunyi Medical UniversityZunyi 563000Guizhou ProvinceChina

BACKGROUND Small cell lung carcinoma(SCLC)is highly susceptible to metastasis in the early stages of the ***,the stomach is an uncommon site of metastasis in SCLC,and only a few cases of this type of metastasis have been ***,SCLC gastric metastases have not been systematically characterized and are easily missed and *** SUMMARY We report three cases of gastric metastasis from SCLC in this *** first patient presented primarily with cough,hemoptysis,and epigastric *** other two patients presented primarily with abdominal discomfort,epigastric distension,and *** patients underwent gastroscopy and imaging ***,the immunohistochemical results of the lesions in three patients were suggestive of small cell ***,the three patients were diagnosed with gastric metastasis of SCLC through a comprehensive *** three patients did not receive appropriate treatment and died within a short *** Here,we focused on summarizing the characteristics of gastric metastasis of SCLC to enhance clinicians'understanding of this disease.

关键词： Small cell lung cancer Gastric neoplasms Neoplasm metastasis Diagnosis Case report

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