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Structural insight into palladium-nickel clusters over mordenite zeolite for carbene-insertion reaction

Frontiers of Chemical Science and Engineering 2024年第9期18卷 89-99页

作者： Guangchao Li ping-Luen Baron Ho Bryan Kit Yue Ng Tai-Sing wu pawel Rymarz Shik Chi Edman tsang Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHong Kong 999077China Department of Chemistry University of OxfordOxford OX13QRUK Synchrotron Radiation Research Center Hsinchu 30076China

The advancement of heterogeneous catalysts incorporating metal clusters in the nanometric size range has garnered significant attention due to their extraordinary catalytic activity and *** detailed characterization and understanding of the atomic structure of these metal clusters within catalysts is crucial for elucidating the underlying reaction *** the present study,a distinctive three-atom pdNi cluster,characterized by two pd atoms at terminal positions and a central Ni atom,was synthesized over mordenite *** presence of atomic pdNi clusters within the eight-membered ring side pocket area was confirmed by multiple advanced analytical techniques,including magic-angle spinning nuclear magnetic resonance spectroscopy,synchrotron X-ray powder diffraction,extended X-ray absorption fine structure spectroscopy,and high-angle annular dark-field scanning transmission electron *** catalytic activity of the confined active species was examined by the carbene-mediated reactions of ethyl-2-diazoacetate to ethyl-2-methoxyacetate as a model *** to the pd-mordenite and Ni-mordenite,the pdNi-mordenite catalyst incorporates a pdNi cluster,which demonstrates a superior performance,achieving 100%conversion and high selectivity under the same reaction *** study elucidates the potential of constructing bimetallic clusters in zeolites,providing valuable insights for developing new heterogeneous catalysts applicable to a wide range of catalytic processes.

关键词： zeolite metal cluster synchrotron X-ray diffraction carbene-mediated reaction

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post-fontan circulation hepatocellular carcinoma:Open and laparoscopic hepatectomy

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Hepatobiliary & pancreatic Diseases International 2024年第1期23卷 90-93页

作者： Karin KY Ho wong Hoi She Simon HY tsang Kevin S Lo Tan To Cheung Department of Surgery The University of Hong Kong102 Pok Fu Lam RoadHong KongChina Department of Anaesthesiology Queen Mary Hospital102 Pok Fu Lam RoadHong KongChina

To the Editor:Fontan-associated liver disease shows increasing incidence as advances in pediatric cardiology have prolonged life expectancy in patients with single ventricle congenital heart defects[1].Their unique physiology and procedure-related sequelae present an increasingly relevant challenge in hepatic *** hereby reported a series of patients suffering from hepatocellular carcinoma(HCC)who successfully underwent open and laparoscopic hepatectomy.

关键词： hepatocellular hepatectomy surgery

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Correlations of baryon and charge stopping in heavy ion collisions

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Chinese physics C 2024年第4期48卷 89-94页

作者：吕文棣李洋李子阳马荣荣唐泽波 prithwish Tribedy Chun Yuen tsang 许长补查王妹 State Key Laboratory of particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China physics Department Brookhaven National LaboratoryUptonNY 11973USA Department of physics Kent State UniversityKentOH 44242USA

Baryon numbers are theorized to be carried by valence quarks in the standard QCD picture of the baryon *** theory proposed an alternative baryon number carrier,a non-perturbative Y-shaped configuration of the gluon field,called the baryon junction in the ***,neither of these theories has been verified ***,searching for the baryon junction by investigating the correlation of net-charge and net-baryon yields at midrapidity in heavy-ion collisions has been *** paper presents studies of such correlations in collisions of various heavy ions from oxygen to uranium with the UrQmD monte Carlo *** UrQmD model implements valence quark transport as the primary means of charge and baryon stopping at *** studies are also conducted for isobaric ^(96)_(40)Zr+^(96)_(40)Zr and ^(96)_(44)Ru+^(96)_(44)Ru *** found a universal trend of charge stopping with respect to baryon stopping and discovered that the charge stopping is always greater than the baryon *** study provides a model baseline in valence quark transport for what is expected in net-charge and net-baryon yields at the midrapidity of relativistic heavy-ion collisions.

关键词： baryon junction baryon number carrier baryon stopping relativistic heavy ion collisions

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precursor engineering enables high-performance all-inorganic CspbIBr_(2) perovskite solar cells with a record efficiency approaching 13%

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Journal of Energy Chemistry 2024年第3期90卷 16-22,I0003页

作者： Qingyan Chang Yidan An Huaiman Cao Yuzhen pan Liangyu Zhao Yulong Chen Yi we Sai-wing tsang Hin-Lap Yip Licheng Sun Ze Yu State Key Laboratory of Fine Chemicals Dalian University of Technology(DUT)Dalian 116024LiaoningChina Department of materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina School of Chemistry Dalian University of Technology(DUT)Dalian 116024LiaoningChina Key Laboratory of materials modification by Laser Ionand Electron Beams(Ministry of Education)Dalian University of Technology(DUT)Dalian 116024LiaoningChina School of Energy and Environment City University of Hong KongKowloon 999077Hong KongChina Center of Artificial photosynthesis for Solar Fuels and Department of Chemistry School of ScienceWestlake UniversityHangzhou 310024ZhejiangChina Department of Chemistry School of Engineering Sciences in ChemistryBiotechnology and HealthKTH Royal Institute of Technology10044 StockholmSweden

All-inorganic CspbIBr_(2) perovskite has attracted widespread attention in photovoltaic and other optoelectronic devices because of its superior thermal ***,the deposition of high-quality solutionprocessed CspbIBr_(2) perovskite films with large thicknesses remains ***,we develop a triple-component precursor(TCp) by employing lead bromide,lead iodide,and cesium bromide,to replace the most commonly used double-component precursor(DCp) consisting of lead bromide and cesium ***,the TCp system significantly increases the solution concentration to 1.3 m,leading to a larger film thickness(~390 nm) and enhanced light *** resultant CspbIBr_(2) films were evaluated in planar n-i-p structured solar cells,which exhibit a considerably higher optimal photocurrent density of 11.50 mA cm^(-2) in comparison to that of DCp-based devices(10.69 mA cm^(-2)).By adopting an organic surface passivator,the maximum device efficiency using TCp is further boosted to a record efficiency of 12.8% for CspbIBr_(2) perovskite solar cells.

关键词： All-inorganic perovskite solar cells CspbIBr_(2) precursor engineering Solubility High performance

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Seismic response of deep circular tunnels subjected to S-waves:Axial bending

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Underground Space 2024年第4期17卷 267-279页

作者： Chatuphat Savigamin Antonio Bobet Osvaldo p.m.Vitali HR Engineering Services Inc.MedleyFL 33166United States Lyles School of Civil Engineering Purdue UniversityWest LafayetteIN 47907United States Department of Civil Environmentaland Construction EngineeringUniversity of Hawaii at ManoaHonoluluHI 96822United States

Ovaling deformation of circular tunnels has received great interest from the tunneling community because this mode of seismicinduced deformation is considered the most ***,there is growing evidence that other deformation modes can also be important and thus need to be considered in *** study presents a new analytical solution to estimate axial bending(snaking),a mode of deformation caused by S-waves impinging on a tunnel parallel to the tunnel *** solution is developed using the soilstructure interaction approach with the assumption that the interface between the ground and the tunnel lining is frictionless(fullslip).Full dynamic numerical simulations are conducted to verify the new full-slip solution,together with the existing no-slip *** of dynamic amplification are also explored for both full-slip and no-slip interface conditions by changing the wavelength(or frequency)of the seismic input motions.

关键词： Seismic response of tunnels Analytical solutions Soil-structure interaction Axial bending Snaking S-waves

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Intraoperative application of three-dimensional printed guides in total hip arthroplasty: A systematic review

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world Journal of Orthopedics 2024年第7期15卷 660-667页

作者： Tim p Crone Bart m w Cornelissen Jakob Van Oldenrijk pieter Koen Bos Ewout S Veltman Department of Orthopedic Surgery and Sports medicine Erasmus Medical CenterRotterdam 3015 GDNetherlands Department of Oral and maxillofacial Surgery Erasmus Medical CenterRotterdam 3015 GDNetherlands

BACKGROUND Acetabular component positioning in total hip arthroplasty(THA)is of key importance to ensure satisfactory post-operative outcomes and to minimize the risk of *** majority of acetabular components are aligned freehand,without the use of navigation *** specific instruments(pSI)and three-dimensional(3D)printing of THA placement guides are increasingly used in primary THA to ensure optimal *** To summarize the literature on 3D printing in THA and how they improve acetabular component *** pubmed was used to identify and access scientific studies reporting on different 3D printing methods used in *** studies with 236 hips in 228 patients were *** studies could be divided into two main categories;3D printed models and 3D printed *** 3D printing in THA helped improve preoperative cup size planning and post-operative Harris hip scores between intervention and control groups(p=0.019,p=0.009).Otherwise,outcome measures were heterogeneous and thus difficult to *** overarching consensus between the studies is that the use of 3D guidance tools can assist in improving THA cup positioning and reduce the need for revision THA and the associated *** The implementation of 3D printing and pSI for primary THA can significantly improve the positioning accuracy of the acetabular cup component and reduce the number of complications caused by malpositioning.

关键词： Total hip arthroplasty Three-dimensional printing Hip replacement surgery Three-dimensional planning Surgical guides

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Intertype superconductivity evoked by the interplay of disorder and multiple bands

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Frontiers of physics 2024年第4期19卷 81-89页

作者： p.m.marychev A.A.Shanenko A.V.Vagov HSE University 101000 MoscowRussia Center for Advanced mesoscience and Nanotechnology MIPTDolgoprudny141700Russia

Nonmagnetic impurity scattering is known to shift up the Ginzburg-Landau parameter k of a *** this case,when the system is initially in type I,it can change its magnetic response,crossing the intertype domain with k~1 between the two standard superconductivity types and arriving at type *** the present work we demonstrate that the impact of disorder can be much more profound in the presence of the multiband structure of the charge carrier *** particular,when the band diffusivities differ from each other,the intertype domain tends to expand significantly,including points with k>>1 that belong to deep type-Ⅱ in conventional single-band *** finding sheds light on the nontrivial disorder effect and significantly complements earlier results on the enlargement of the intertype domain in clean multiband superconductors.

关键词： superconductivity disorder intertype superconductivity twoband model

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mechanisms behind the environmental sensitivity of carbon fiber reinforced polytetrafluoroethylene(pTFE)

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Friction 2024年第5期12卷 997-1015页

作者： pontus JOHANSSON p.mARKLUND m.BJORLING Y.SHI Division of machine Element LuleåUniversity of TechnologyLuleåSE-97187Sweden

Carbon fiber reinforced polytetrafluoroethylene (CF/pTFE) composites are known for their exceptional tribological performance when sliding against steel or cast iron in inert gas environments. Compared to experiments in humid air, about an order of magnitude lower wear rate and several times lower coefficient of friction have been reported for tests conducted in dry nitrogen and hydrogen. moreover, trace moisture has been shown to affect the friction and wear significantly of this tribosystem, although a possible effect of oxygen cannot be ruled out due to uncertainties regarding the oxygen concentrations. while several studies have pointed out the environmental sensitivity of CF/pTFE, the understanding of the underlying mechanisms are very limited. The objective of this research is to investigate the individual and combined effect of oxygen and moisture on the tribological behavior of CF/pTFE sliding against steel. Additionally, this study aims to elucidate the underlying mechanisms that govern the environmental sensitivity of the system. Climate-controlled three-pin-on-disc experiments were conducted in nitrogen atmospheres at various concentrations of oxygen and moisture. The tribological results clearly demonstrate that both moisture and oxygen contribute to increased friction and wear. However, the adverse effect was much more pronounced for oxygen than moisture. A qualitative method was developed to estimate the tribofilm coverage on the CF/pTFE surface. Results showed strong correlation between high coverage of strongly adhered tribofilm and low wear rate. moreover, a loosely adhered tribofilm was observed on top of the CF/pTFE surface in presence of moisture. FTIR analysis indicated that the loosely adhered tribofilm found in the moisture-enriched environment contained a significant amount of adsorbed water, which may explain the lower coefficient of friction in presence of moisture compared to oxygen. The adsorbed water in the loosely adhered tribofilm coul

关键词： polymer composite tribofilm tribochemistry atmosphere

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Indications of pro-inflammatory cytokines in laparoscopic and open liver resection for early-stage hepatocellular carcinoma

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Hepatobiliary & pancreatic Diseases International 2024年第3期23卷 257-264页

作者： Kevin Tak-pan Ng Li pang Jia-Qi wang wong Hoi She Simon Hing-Yin tsang Chung mau Lo Kwan man Tan To Cheung Department of Surgery HKU-SZH&School of Clinical MedicineLi Ka Shing Faculty of MedicineThe University of Hong KongHong KongChina State Key Laboratory of Liver Research The University of Hong KongHong KongChina

Background:Our clinical practice of laparoscopic liver resection(LLR)had achieved better short-term and long-term benefits for patients with hepatocellular carcinoma(HCC)over open liver resection(OLR),but the underlying mechanisms are not *** study was to find out whether systemic inflammation plays an important ***:A total of 103 patients with early-stage HCC under liver resection were enrolled(LLR group,n=53;OLR group,n=50).The expression of 9 inflammatory cytokines in patients at preoperation,postoperative day 1(pOD1)and pOD7 was quantified by Luminex multiplex *** relationships of the cytokines and the postoperative outcomes were compared between LLR and ***:Seven of the circulating cytokines were found to be significantly upregulated on pOD1 after LLR or OLR compared to their preoperative *** to OLR,the pOD1 levels of granulocytemacrophage colony-stimulating factor(Gm-CSF),interleukin-6(IL-6),IL-8,and monocyte chemoattractant protein-1(mCp-1)in the LLR group were significantly *** pOD1 levels of these cytokines were significantly correlated with longer operative time and higher volume of blood loss during *** levels of these cytokines were positively associated with postoperative liver injury,and the length of hospital ***,a high level of IL-6 at pOD1 was a risk factor for HCC recurrence and poor disease-free survival after liver ***:Significantly lower level of Gm-CSF,IL-6,IL-8,and mCp-1 after liver resection represented a milder systemic inflammation which might be an important mechanism to offer better short-term and long-term outcomes in LLR over OLR.

关键词： Laparoscopic liver resection Open liver resection Hepatocellular carcinoma postoperative cytokines Inflammatory responses

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Drought events influence nutrient canopy exchanges and green leaf partitioning during senescence in a deciduous forest

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Forest Ecosystems 2024年第1期11卷 110-119页

作者： J.Touche C.Calvaruso p.De Donato m.-p.Turpault INRAE BEFF-54000NancyFrance UmR 7359 GeoRessourcesFaculte des Sciences-Campus des Aiguillettes54506Vandoeuvre Les NancyFrance EcoSustain Environmental Engineering OfficeResearch and DevelopmentKanfen57330France

The increase in the frequency and intensity of drought events expected in the coming decades in western Europe may disturb forest biogeochemical cycles and create nutrient deficiencies in *** possible origin of nutrient deficiency is the disturbance of the partitioning of the green leaf pool during the leaf senescence period between resorption,foliar leaching and senesced ***,the effects of drought events on this partitioning and the consequences for the maintenance of tree nutrition are poorly *** experiment in a beech forest in meuse(France)was conducted to assess the effect of drought events on nutrient canopy exchanges and on the partitioning of the green leaf pool during the leaf senescence *** aim was to identify potential nutritional consequences of droughts for *** nutrient dynamics,including resorption,chemistry of green and senesced leaves,foliar absorption and leaching in mature beech stands from 2012 to 2019 allowed us to compare the nutrient exchanges for three nondry and three dry years(i.e.,with an intense drought event during the growing season).During dry years,we observed a decrease by almost a third of the potassium(K)partitioning to resorption(*** efficiency),thus reducing the K reserve in trees for the next growing *** result suggests that with the increased drought frequency and intensity expected for the coming decades,there will be a risk of potassium deficiency in trees,as already observed in a rainfall exclusion experiment on the same study *** foliar leaching and higher parititioning to the senesced leaves for K and phosphorus(p)were also *** addition,a slight increase in nitrogen(N)resorption efficiency occurred during dry years which is more likely to improve tree *** calcium(Ca)negative resorption decreased,with no apparent consequence in our study *** results show that nutrient exchanges in the canopy and the partitioning of the green leaf

关键词： Natural drought Beech forest Canopy Resorption Foliar leaching Senesced leaves Nutrition

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