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Crystalline covalent triazine frameworks manipulated by aliphatic amine modulator

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中国科学:化学英文版 2023年第9期66卷 2676-2682页

作者： Xunliang Hu Yantong Guo Ruixue sun Xiaoyan Wang bien Tan Key Laboratory of Material Chemistry for Energy Conversion and storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China

Crystallization is an unsolved challenge in the chemistry of covalent triazine frameworks(CTFs) due to the poorly controlled simultaneous polymerization and crystallization processes. Herein, the synthesis of crystalline CTFs via the introduction of aliphatic amine as a dynamic modulator is reported. By optimizing the amount of aliphatic amine, the crystallization process can be controlled in an open system, resulting in the synthesis of crystalline CTFs. These crystalline CTFs exhibit much better photocatalytic hydrogen evolution performance, with highly ordered CTF-1-C3 demonstrating superior performance(10 mmol g^(-1)h^(-1)) compared with most reported CTF-1. This approach also allows for the preparation of various crystalline CTFs.

关键词： covalent triazine frameworks crystallinity aliphatic amine modulator photocatalytic water splitting

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Discrete-frequency Convergence of Iterative Learning Control for Linear Time-invariant systems with Higher-order Relative Degree

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International Journal of Automation and computing 2015年第3期12卷 281-288页

作者： Xiao-E Ruan Zhao-Zhen Li Z.Z.bien school of Mathematics and statistics Xi an Jiaotong University Department of Electrical Engineering Korea Advanced Institute of Science and Technology

In this paper, a discrete-frequency technique is developed for analyzing sufficiency and necessity of monotone convergence of a proportional higher-order-derivative iterative learning control scheme for a class of linear time-invariant systems with higher-order relative degree. The technique composes of two steps. The first step is to expand the iterative control signals, its driven outputs and the relevant signals as complex-form Fourier series and then to deduce the properties of the Fourier coefficients. The second step is to analyze the sufficiency and necessity of monotone convergence of the proposed proportional higher-order-derivative iterative learning control scheme by assessing the tracking errors in the forms of Paserval s energy modes. numerical simulations are illustrated to exhibit the validity and the effectiveness.

关键词： Iterative learning control monotone convergence discrete frequency-domain spectrum Fourier series Parseval s energy equality rel

Burns infection profile of singapore:prevalence of multidrug-resistant Acinetobacter baumannii and the role of blood cultures

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Burns & Trauma 2016年第2期4卷 144-152页

作者： Christopher Tam song Jolie Hwee Colin song bien Keem Tan si Jack Chong University of Edinburgh EdinburghUK singapore General Hospital SingaporeSingapore Cape Clinic singapore SingaporeSingapore

Background:With various changes implemented such as perioperative antibiotics for tangential excision,this retrospective study reviews the infection profile of burn patients at singapore's only centralized burns ***,the appearance of multidrug-resistant(MDR)strains of Acinetobacter baumanni(***)continues to worsen patient *** study also surveys the role of blood cultures in burns at our ***:Four hundred fifty-two burn patients admitted to the unit between 2011 and 2013,and with cultures performed,were included in the *** yields of various cultures were evaluated and 2684 samples were amassed,of which 984(36.7%)were *** variables for predictors of MDR *** infection acquisition and bacteremia were evaluated through multivariate ***:Pseuodomonas aeruginosa(***)(67 patients)was the most common organism in those with total body surface area(TBsA)burnnts)was most prevalent in those with TBsA burn≥20%.We found a yield of 1.1%positive blood cultures for TBsA burnnd a yield of 18.6%positive cultures in TBsA burn≥20%.The median time between surgery and bacteremia was 6.5 days(range-18 to 68 days,interquartile range 4.5);2.9 and 8.8%of bacteremic episodes occurred within 24 and 48 h,*** is a decrease from a predeceasing study(45.3%for 24 h and 60%for 48 h).Multivariate analysis revealed that length of hospital stay and TBsA burn≥20%were predictors of MDR *** infection and positive blood ***:MDR *** infection burdens patient management,especially in those with TBsA burn≥20%and longer hospital *** antibiotics may reduce perioperative bacteremia,but their role in MDR infections needs to be *** role of blood cultures in TBsA burnneeds reconsideration.

关键词： Drug resistant Burns Acinetobacter baumanni Blood cultures Epidemiology singapore Infection

A thioether-functionalized pyrene-based covalent organic framework anchoring ultrafine Au nanoparticles for efficient photocatalytic hydrogen generation

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Chinese Journal of Catalysis 2022年第10期43卷 2699-2707页

作者： Zhiming Zhou Chuanbiao Bie Peize Li bien Tan Yan shen Wuhan national Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina Key Laboratory of Material Chemistry for Energy Conversion and storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074HubeiChina Laboratory of solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina

Covalent organic frameworks(COFs)have lately emerged as a blooming class of potential materials for photocatalytic water splitting because of their high crystallinity,huge surface areas,and structural ***,the photocatalytic performance for most pure COFs face some limitations factors,such as the significant recombination of photogenerated carriers and slow charge ***,a novel thioether-functionalized pyrene-based COF(s_(4)-COF)was effectively produced and chosen as a support for the immobilization of ultrafine gold nanoparticles(Au nPs).s_(4)-COF photocatalyst with Au as cocatalyst demonstrates remarkable photocatalytic activity with a H_(2) generation rate of 1377μmol g^(−1) h^(−1) under visible light(>420 nm),which is ca.4.5-fold increase comparing to that of pure s_(4)-COF(302μmol g^(−1) h^(−1)).Au nPs anchored on s_(4)-COF possess an ultrafine size distribution ranging from 1.75 to 6.25 nm with an average size centered at 3.8 nm,which benefits from the coordination interaction between thioether groups and ***,the produced Au@s_(4)-COF can generate a stable photocatalytic H_(2) generation during the four recycles and preserve its crystallinity structure after the stability *** Au nPs anchored on the s_(4)-COF photocatalyst can greatly accelerate the separation of photogenerated carriers and increase charge transfer because of the combined function of Au nPs and thioether *** a method can not only prevent the aggregation of Au nPs onto thioether-containing COFs to achieve long-term photostability but also allow uniform dispersion for an ordered structure of *** work provides a rational strategy for designing and preparing COF-based photocatalysts for solar-driven H_(2) production.

关键词： Photocatalysis Covalent organic framework Thioether functionalization Gold nanoparticle Coordination interaction Photogenerated carrier separation

Combined Effect of Infiltration, Capillary Barrier and sloping Layered soil on Flow and solute Transfer in a Heterogeneous Lysimeter

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Open Journal of Modern Hydrology 2013年第3期3卷 138-153页

作者： Le Binh bien Dieuseul Predelus Laurent Lassabatere Thierry Winiarski Rafael Angulo-Jaramillo Laboratoire d’Ecologie des Hydrosystèmes naturels et Anthropisés UMR 5023 CNRS-ENTPE-UCBL Université de Lyon Lyon France Laboratoire d’Ecologie des Hydrosystèmes naturels et Anthropisés UMR 5023 CNRS-ENTPE-UCBL Université de Lyon Lyon France.

This aim of this paper is to describe a study of the combined effect of infiltration, capillary barrier and sloping layered soil on both flow and solute transport processes in a large, physical model (1 × 1 × 1.6 m3) called LUGH (Lysimeter for Urban Groundwater Hydrology) and a 3D numerical flow model. sand and a soil composed of a bimodal sand-gravel mixture were placed in the lysimeter to simulate one of the basic structural and textural elements of the heterogeneity observed in the vadose zone under an infiltration basin of Lyon (France). Water and an inert tracer (KBr) were injected from the top of the lysimeter using a specific water sprinkler system and collected at 15 different outlets at the bottom. The outlet flows and the 15 breakthrough curves obtained presented high heterogeneity, emphasising the establishment of preferential flows resulting from both capillary barrier and soil layer dip effects. numerical modelling led to better understanding of the mechanisms responsible for these heterogeneous transfers and it was also used to perform a sensitivity analysis of the effects of water velocity (water and solute flux fed by the sprinkler) and the slope interface. The results show that decreasing velocity and increasing the slope of the interface can lead to the development of preferential flows. In addition, the offset of the centre of gravity of the flow distribution at the output increases linearly as a function of the slope angle of the layered soil. This paper provides relevant information on the coupling between hydrodynamic processes and pollutant transfer in unsaturated heterogeneous soil and emphasizes the role of the geometry of the interfaces between materials and boundary conditions as key factors for preferential flow.

关键词： Capillary Barrier Lysimeter Preferential Flow Unsaturated soil

Assessment of Establishing Commodity R＆D Model in East Asia by Taiwan Manufacturers

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Assessment of Establishing Commodity R＆D Model in East Asia...

2011 International Conference on sociality and Economics Development（ICsED 2011）

作者： Min-Wei Hsu Tsai-Yun Lo bien-shoujen The Graduate Institute of Design science Tatung University Jinwen University of science and Technology

The organization of 2009 Beijing Olympic Games and the World Expo 2010 shanghai has contributed to the rapid economic growth of *** to the economic data released by national Bureau of statistics in 2011,China’s GDP in 2010 showed that China has become the world’s second largest economy in *** gained an increasingly important role in the global economy,China’s increasingly close ties to the world have formed relative threats to Taiwan and southeast Asian *** relocation of Taiwan manufacturing companies has further evolved into the necessary trend in international competition of "creating a self-brand." Due to the parallelism of social and economic system and industry standards between Taiwan and Western countries,the "financial crisis" triggered by the Us subprime mortgage crisis leading to the merger integration among Tier1 manufacturers has already brought dramatic impacts on the mass production models of Taiwan’s sME conventional *** the implementation of case study in "Conventional Industry Technology Development" from Taiwan’s Ministry of Economic Affairs （Project no.:s09800053-099） and at the economic reversal,the paper proposes a design method for R＆D quality enhancement planning for the case manufacturers of exploration,presenting how "OEM," "ODM" or even "OBM" plays a role on the different stages of evolution,followed by implementing the plans and design of establishing self-brands after enhancing the design *** study will provide a detailed description on the innovative brand development model of industrial restructuring for manufacturing and one of the important reference models for strengthening the competitiveness of industry.

关键词： Economics and Development studies Business strategy Design Process Product R&D Model

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中越网络零售市场发展状况对比研究

世界经济探索 2023年第4期12卷 396-404页

作者： HuaThi bien HuaThi Phe 常州大学商学院江苏常州北京理工大学管理与经济学院北京

随着互联网的发展和消费者的消费观念已经逐步改变,世界的电子商务得到飞速发展。中国是全球最大的网络零售市场之一。而作为中国直接接壤的邻国,越南零售市场如何能够进行快速发展,如何借鉴中国的一些成功经验?本研究通过分析近年来中... 详细信息

随着互联网的发展和消费者的消费观念已经逐步改变,世界的电子商务得到飞速发展。中国是全球最大的网络零售市场之一。而作为中国直接接壤的邻国,越南零售市场如何能够进行快速发展,如何借鉴中国的一些成功经验?本研究通过分析近年来中越电子商务零售业数据,包括对比中国和越南的市场规模和增长速度、参与者和竞争格局以及消费者的支付方式偏好,旨在指出两国零售市场之间的相同和差异点。研究分析结果指出,中越网络零售市场共同点,包括一些方面:移动互联网普及、电子商务快速增长、市场竞争、电子支付。此外,两国的零售市场也存在着一些差异点,如:市场规模、电子支付的普及等。同时,从中国零售市场的发展经验本研究也为越南零售市场提供了启示和政策建议。

关键词：网络零售电子商务发展趋势市场规模

论卢卡奇对文化及经济优先性的理解——技术时代的人、经济与文化

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洛阳师范学院学报 2010年第4期29卷 26-28页

作者：约瑟夫.宾林建成密苏里大学哲学系北京交通大学人文学院北京100044

对技术时代的人、经济与文化的关系,卢卡奇认为经济的优先性既是人的物化的表现,也是文化被扭曲的表现,但它仅限于阶级社会。经济统治的终结是真正文化产生的必要前提。真正的文化是把反映人的自由活动作为自身目的的文化,这样的文化对... 详细信息

对技术时代的人、经济与文化的关系,卢卡奇认为经济的优先性既是人的物化的表现,也是文化被扭曲的表现,但它仅限于阶级社会。经济统治的终结是真正文化产生的必要前提。真正的文化是把反映人的自由活动作为自身目的的文化,这样的文化对社会的经济基础保持着自己的自由。

关键词：文化经济人

自身免疫起源的迟发性癫痫流行率和临床结局:一项前瞻性观察性人群队列研究

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癫痫杂志 2018年第3期4卷 242-248页

作者： Felix von Podewils Marie suesse Julia Geithner 张颖颖童馨慕洁 Gaida B Wang ZI Lange J Dressel A Grothe M Kessler C Langner s Runge U bien CG

众所周知,随着年龄增长新发癫痫的发病率增加。通常,这些患者的病因难以明确。研究调查了有非诱导性迟发性癫痫发作且不合并肿瘤(可能患有副肿瘤性脑炎)患者的潜在自身免疫反应情况。在4.75年内前瞻性连续纳入了66例患者(至少有一次癫... 详细信息

众所周知,随着年龄增长新发癫痫的发病率增加。通常,这些患者的病因难以明确。研究调查了有非诱导性迟发性癫痫发作且不合并肿瘤(可能患有副肿瘤性脑炎)患者的潜在自身免疫反应情况。在4.75年内前瞻性连续纳入了66例患者(至少有一次癫痫或癫痫发作,病程≤6个月,36例女性,年龄≥55岁)。检测所有患者的血清、脑脊液抗体和神经细胞表面、细胞内抗原。45例患者(68%)进行了核磁共振(MRI)检查。对于抗体阳性的患者随访时间至少6个月。2例患者血清、脑脊液中抗接触蛋白相关性蛋白样-2(Contactin associated protein-like 2,CAsPR2)抗体滴度高,符合明确边缘性脑炎的诊断标准。另外2例患者MRI显示双侧脑颞区炎性异常,尽管血清、脑脊液抗体阴性,也符合明确边缘性脑炎的诊断标准。这4例患者年龄55~70岁之间,均接受了抗免疫治疗和(或)抗癫痫治疗之后变成癫痫再无发作。该研究发现提示自身免疫应该被认为是迟发型癫痫患者的一个重要病因。对于这些患者,神经元抗体检测和大脑MRI可能是有价值的检查手段。

关键词：自身免疫性病因迟发型癫痫神经元抗体