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Manipulating guest-responsive spin transition to achieve switchable fluorescence in a Hofmann-type framework

Science China Chemistry 2024年第10期67卷 3339-3346页

作者： Xue-Ru Wu Shu-Qi Wu Zhi-Kun Liu ming-xing chen Jun Tao Osamu Sato Hui-Zhong Kou Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China Institute for Materials Chemistry and Engineering&IRCCS Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488China Analytical Instrumentation Center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The change of fluorescence emission manipulated by spin state transition attracts considerable attention owing to its potential applications in magneto-optical switching ***,we report two two-dimensional(2D)Hofmann-type spin crossover(SCO)metal-organic frameworks(MOFs)[Fe^(Ⅱ)(PNI)_(2){Ag^(Ⅰ)(CN)_(2)}_(2)]·CHCl_(3)(3Ag·CHCl_(3))and[FeⅡ(PNI)_(2){AuⅠ(CN)_(2)}_(2)]·CHCl_(3)(3Au·CHCl_(3))based on the fluorescent ligand N-(4-pyridylmethyl)-1,8-naphthalimide(PNI).Both complexes exhibit interesting SCO behaviors switched by guest solvent molecules,namely three-step transitions for the solvated complexes and complete onestep hysteretic SCO for the desolvated ones,verified by temperature-dependent magnetic susceptibility measurements,Mossbauer spectra,structural analyses,and differential scanning calorimetry ***,temperature-dependent fluorescence spectra exhibit double peaks(monomer and excimer emission)with both emission peaks change consistent with the change in SCO properties during the solvent molecule *** this study,we integrated guest-responsive SCO behavior into MOFs to manipulate the multistability of spin state and fluorescence switching,providing a rational strategy for the development of stimuli-responsive multifunctional materials.

关键词： spin crossover fluorescence multifunctional materials metal-organic frameworks Hofmann-type

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Lithium carbonate-induced giant goiter and subclinical hyperthyroidism in a patient with schizophrenia:A case report and review of literature

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World Journal of Clinical Cases 2024年第20期12卷 4357-4364页

作者： xing-ming chen Zhi-Li Jiang Xiang Wu Xu-Guang Li Department of Psychiatry The Affiliated Brain Hospital of Guangzhou Medical UniversityGuangzhou 510370Guangdong ProvinceChina Department of General Surgery The Affiliated Brain Hospital of Guangzhou Medical UniversityGuangzhou 510370Guangdong ProvinceChina Key Laboratory of Neurogenetics and Channelopathies of Guangdong Province The Ministry of Education of ChinaGuangzhou Medical UniversityGuangzhou 511436Guangdong ProvinceChina

BACKGROUND Lithium carbonate is used to manage various mood disorders,but it can cause thyroid abnormalities,including goiter,hypothyroidism,and *** rare cases,it can lead to giant goiter and subclinical hyperthyroidism,which may require surgical intervention in severe *** SUMMARY This case represents a rare development of giant goiter and subclinical hyperthyroidism in a schizophrenia patient who was subjected to prolonged lithium carbonate *** enlarged thyroid gland caused pressure on the airway and recurrent laryngeal nerve,which led to respiratory distress,hoarseness,and *** immediate danger of suffocation required urgent surgical *** this report,we describe the case of a 41-year-old Chinese *** sheds light on the etiology and challenges associated with managing a giant *** patient underwent a subtotal thyroidectomy to relieve airway compression and facilitate airway *** to the procedure,the patient was given iodine to ***,changes were made to the psychiatric medication *** surgery,the patient's respiratory function and vocal cord functionality improved significantly,and her mental state remained *** It is essential to monitor thyroid function,test thyroid antibody levels,and perform thyroid ultrasounds consistently in all patients undergoing long-term lithium carbonate *** vigilance helps prevent severe and potentially life-threatening thyroid enlargement.

关键词： Lithium carbonate Giant goiter Subclinical hyperthyroidism Schizophrenia Subtotal thyroidectomy Case report

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深圳市坪山区正本清源工程治理探讨

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工程建设与设计 2024年第18期 55-57页

作者：明星辰深圳市市政设计研究院有限公司广东深圳518029

以深圳市坪山区正本清源工程为例,简述了该项目存在基础资料难溯源、涉及区域大、产权复杂、建设条件差、机械进场难以及排水系统等难点,对住宅管网、工业管网、建筑立管设计3个方面展开研究。研究结果表明,通过对能修复的管道进行修复... 详细信息

以深圳市坪山区正本清源工程为例,简述了该项目存在基础资料难溯源、涉及区域大、产权复杂、建设条件差、机械进场难以及排水系统等难点,对住宅管网、工业管网、建筑立管设计3个方面展开研究。研究结果表明,通过对能修复的管道进行修复,不能修复的管道有规划地对立管进行改造,解决了网线错综复杂及因排水不当而造成的环境污染等问题。

关键词：排水管网正本清源设计方案面源污染

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High-temperature chlorination of gold with transformation of iron phase

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Rare Metals 2016年第11期35卷 881-886页

作者： Zheng-Yao Li Wei-Wei Wang Kun Yue ming-xing chen School of Civil and Environmental Engineering University of Science and Technology Beijing

Gold in cyanide tailings from Shandong Province is mainly encapsulated by hematite and magnetite at distribution rates of 76.49 % and 10.88 %, ***-reduction one-step roasting of cyanide tailings was conducted under the following conditions： calcium chloride dosage of 6 %, bituminous coal dosage of 30 %, calcium oxide dosage of 10 %（all dosages are *** mass of cyanide tailings） at 1000 ℃ of roasting temperature. X-ray diffraction（XRD）, scanning electron microscopy（SEM）, and chemical-phase analysis were performed to investigate the effects of iron phase transformation on the high-temperature chlorination of *** indicate that the lattice structure of hematite undergoes expansion, pulverization, and reorganization when hematite is reduced to magnetite, which leads to42.03 % gold exposure, and the high-temperature chlorination rate of gold is 41.17 % at the same time. The structure of wustite formed by the reduction in magnetite is porous and loose, and thus 44.02 % of gold is exposed. The high-temperature chlorination rate of gold is increased by41.98 percentage points. When wustite is reduced to metallic iron, 4.42 % of gold is exposed, and the hightemperature chlorination rate of gold is increased by3.38 percentage points. Accordingly, the high-temperature chlorination of gold mainly occurs in two stages, in which Fe_2O_3 is reduced to Fe_3O_4, and Fe_3O_4 is reduced to Fe_xO finally.

关键词： Cyanide tailings Chlorination-reduction one-step roasting Transformation of iron phase Gold

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Rare narrow QRS tachycardia with atrioventricular dissociation: A case report

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World Journal of Clinical Cases 2020年第21期8卷 5420-5425页

作者： Chao Zhu ming-xing chen Gui-Jian Zhou Department of Cardiology The Affiliated Hospital of Yangzhou UniversityYangzhou UniversityYangzhou 225009Jiangsu ProvinceChina

BACKGROUND Most Mahaim fibers are right free-wall atriofascicular accessory pathways with only antegrade *** Mahaim fiber is not very rare;however,concealed nodoventricular fiber is a very rare kind of retrograde accessory pathway in supraventricular tachycardia with atrioventricular(AV)*** a few cases about successful ablation of the nodoventricular accessory pathway have been *** describe the case of a 32-year-old woman who underwent an electrophysiology study and radiofrequency(RF)ablation of a rare narrow QRS tachycardia with AV *** SUMMARY A 32-year-old woman with a history of paroxysmal palpitation was admitted to our hospital for RF *** revealed a narrow QRS complex tachycardia with the same morphology in sinus *** showed no structural heart disease.A right-sided concealed AV accessory pathway and a right-sided concealed nodoventricular accessory pathway were involved in the orthodromic atrioventricular reciprocating *** bundle-ventricular interval during tachycardia was the same as that in sinus *** tachycardia could be initiated and entrained by ventricular *** right ventricular stimulus introduced during the His-bundle refractory period when tachycardia occurred was able to advance the next atrial *** earliest atrial activation was mapped near the proximal slow AV nodal *** ablation of both accessary pathways was successfully performed under the guidance of a three-dimensional mapping system by recording the earliest retrograde atrial potential,and tachycardia could no longer be *** Narrow QRS tachycardia with AV dissociation is inducible by concealed nodoventricular fiber and ablated by recording the earliest retrograde atrial potential.

关键词： Atrioventricular dissociation Nodoventricular pathways Ablation Narrow QRS wave tachycardia Mahaim fiber Case report

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Physical and Electrochemical Characterization of Hydrothermal Prepared α'-NaV_2O_5 Crystals

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Chemical Research in Chinese Universities 2010年第2期26卷 291-293页

作者： HU Fang WEI Ying-jin JIANG Tao ming xing chen Gang WANG Chun-zhong College of Physics State Key Laboratory of Superhard Materials Jilin University Changchun 130012 P. R. China

a＇-NaV2O5 was prepared by a simple hydrothermal process. X-ray diffraction confirmed the orthorhombic structure of a＇-NaV2O5, with preferential growth along the （001） direction. Scanning electron microscopy showed a＇-NaV205 was composed of flake-shaped crystals. X-ray photoelectron spectroscopy confirmed the co-existence of V^4＋ and V^5＋ in a＇-NaV2O5, which results in an average V^4.5＋ oxidation state of a＇-NaV2O5. The observed Raman bands are ascribed to different V-O vibrations, a＇-NaV205 shows a reversible specific capacity of about 100 mA·h·g^-1 between 3.5 and 1.0 V, with a good capacity retention. The good electrochemical stability of the material is attributed to its structural stability during Li^＋ intercalation.

关键词： Lithium ion battery Vanadium bronze Electrochemical performance

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Fluorescence emission modulation in cyanido-bridged Fe(Ⅱ)spin crossover coordination polymers

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Science China Chemistry 2022年第8期65卷 1569-1576页

作者： Xue-Ru Wu Zhi-Kun Liu Min Zeng ming-xing chen Jun Tao Shu-Qi Wu Hui-Zhong Kou Department of Chemistry Tsinghua UniversityBeijing 100084China Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488China Analytical Instrumentation Center College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China Institute for Materials Chemistry and Engineering&IRCCS Kyushu University744 MotookaNishi-kuFukuoka 819-0395Japan

Synergistic fluorescent spin crossover(SCO)bifunctional molecular materials have novel applications in the molecule-based magneto-optical ***,we report two novel three-dimensional(3D)Hofmann-type fluorescent SCO complexes[Fe^(II)-(tppe)MI(CN)_(2)]ClO_(4)·nSolv(tppe=tetra-(4-pyridylphenyl)ethene,M=Ag(tppe-Ag),Au(tppe-Au)).Both complexes show one-step abrupt SCO with the transition temperature of 230 K for tppe-Ag,and 245 K for tppe-Au accompanied by a color change from red to light *** SCO process is confirmed by the variable-temperature single-crystal X-ray diffraction analysis on *** the first time,the abnormal increase in emission intensity and concomitant large bathochromic shifts in the fluorescence spectra during the SCO process are realized in the 3D Hofmann-type coordination polymers expanded by the tetradentate tppe ***,tppe-Ag exhibits the unprecedented fluorescence emission from green to the edge of yellow.

关键词： fluorescence spin crossover multifunctional materials coordination polymers synergetic effect

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Using ketamine in a patient with a near-occlusion tracheal tumor undergoing tracheal resection and reconstruction: A case report

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World Journal of Clinical Cases 2022年第23期10卷 8417-8421页

作者： Xiao-Han Xu Hui Gao xing-ming chen Hao-Bo Ma Yu-Guang Huang Department of Anesthesiology Peking Union Medical College HospitalBeijing 100730China Department of Otolaryngology-Head and Neck Surgery Peking Union Medical College HospitalBeijing 100730China Department of Anesthesia Critical Care and Pain MedicineBeth Israel Deaconess Medical CenterBostonMA 02215United States

BACKGROUND Tracheal tumors may cause airway obstruction and pose a significant risk to ventilation and *** to its rarity,there is currently no established protocol or guideline for anesthetic management of resection of upper tracheal tumors,therefore individualized strategies are *** are limited number of reports regarding the anesthesthetic management of upper tracheal resection and reconstruction(TRR)in the *** successfully used intravenous ketamine to manage a patient with a near-occlusion upper tracheal tumor undergoing *** SUMMARY A 25-year-old female reported progressive dyspnea and *** showed an intratracheal tumor located one tracheal ring below the glottis,which occluded>90%of the tracheal *** patient was scheduled for *** the risk of complete airway collapse after the induction of general anesthesia,we decided to secure the airway with a tracheostomy with spontaneous *** surgeons needed to transect the trachea 1-2 cartilage rings below and above the tumor borders:a time-consuming *** and movement needed be minimized;thus,we added intravenous ketamine to local anesthetic *** tracheostomy,an endotracheal tube was placed into the distal trachea,and general anesthesia was *** surgeons resected four cartilage rings with the tumor attached and anastomosed the posterior tracheal *** performed a video-laryngoscopy to place a new endotracheal ***,the surgeons anastomosed the anterior tracheal *** patient was extubated *** Ketamine showed great advantages in the anesthesia of upper TRR by providing analgesia with minimal respiratory depression or airway collapse.

关键词： Ketamine Near-occlusion Upper tracheal tumor Tracheal resection and reconstruction Tracheostomy Case report

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Intelligent geochemical interpretation of mass chromatograms:Based on convolution neural network

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Petroleum Science 2024年第2期21卷 752-764页

作者： Kai-ming Su Jun-Gang Lu Jian Yu Zi-xing Lu Shi-Jia chen Hubei Key Laboratory of Petroleum Geochemistry and Environment Wuhan430100HubeiChina College of Resources and Environment Yangtze UniversityWuhan430100HubeiChina School of Geoscience and Technology Southwest Petroleum UniversityChengdu610500SichuanChina Changqing Oilfield Company PetroChinaXi'an710021ShaanxiChina

Gas chromatography-mass spectrometry(GC-MS)is an extremely important analytical technique that is widely used in organic *** is the only approach to capture biomarker features of organic matter and provides the key evidence for oil-source correlation and thermal maturity ***,the conventional way of processing and interpreting the mass chromatogram is both timeconsuming and labor-intensive,which increases the research cost and restrains extensive applications of this *** overcome this limitation,a correlation model is developed based on the convolution neural network(CNN)to link the mass chromatogram and biomarker features of samples from the Triassic Yanchang Formation,Ordos Basin,*** this way,the mass chromatogram can be automatically *** research first performs dimensionality reduction for 15 biomarker parameters via the factor analysis and then quantifies the biomarker features using two indexes(*** and PMI)that represent the organic matter thermal maturity and parent material type,***,training,interpretation,and validation are performed multiple times using different CNN models to optimize the model structure and hyper-parameter setting,with the mass chromatogram used as the input and the obtained MI and PMI values for supervision(label).The optimized model presents high accuracy in automatically interpreting the mass chromatogram,with R2values typically above 0.85 and0.80 for the thermal maturity and parent material interpretation results,*** significance of this research is twofold:(i)developing an efficient technique for geochemical research;(ii)more importantly,demonstrating the potential of artificial intelligence in organic geochemistry and providing vital references for future related studies.

关键词： Organic geochemistry Biomarker Mass chromatographic analysis Automated interpretation Convolution neural network Machine learning

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Effect of different bottom blowing elements on stirring characteristics of molten bath in converter

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Journal of Iron and Steel Research International 2024年第2期31卷 368-376页

作者： ming Lv Shuang-ping chen Hong-min Guo Yi-jie Hao Xiang-dong xing School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an710055ShaanxiChina Shaanxi Longmen Steel Company Hancheng715405ShaanxiChina

The bottom blowing element is the key equipment to ensure the bottom blowing effect of the *** types of bottom blowing elements,dispersive type(D1),double circular seam(D2)and straight cylinder type(D3),were built,and the effects of bottom blowing element type on molten bath flow,wall erosion and furnace bottom erosion were *** was found that when the bottom blowing elements of dispersive type(D1)and double circular seam(D2)were used,the dead zone area in the lower part of the molten bath was smaller,and the high-speed zone area was larger;therefore,the stirring effect on the bottom melt was *** the straight cylinder type(D3)bottom blowing element was used,the gas penetrated the molten bath at a faster rate to reach the surface of molten bath and failed to disperse in the bottom molten bath,and the wall shear stress near the nozzle outlet was *** argon was blown by three different bottom blowing elements,the area of the wall shear stress greater than 3 Pa was 4.8,5.6 and 8.7 cm2,respectively,within 0.2 m of the bottom blowing nozzle outlet.

关键词： Converter steelmaking Bottom blowing element Molten bath stirring Wall erosion

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