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| 1 | Enabling highly efficient and broadband electromagnetic wave absorption by tuning impedance match in high-entropy transition metal diborides (HETMB_(2))显示文摘The advance in communication technology has triggered worldwide concern on electromagnetic wave pollution.To cope with this challenge,exploring high-performance electromagnetic(EM)wave absorbing materials with dielectric and magnetic losses coupling is urgently required.Of the EM wave absorbers,transition metal diborides(TMB2)possess excellent dielectric loss capability.However,akin to other single dielectric materials,poor impedance match leads to inferior performance.High-entropy engineering is expected to be effective in tailoring the balance between dielectric and magnetic losses through compositional design.Herein,three HE TMB2 powders with nominal equimolar TM including HE TMB2-I(TM=Zr,Hf,Nb,Ta),HE TMB2-2(TM=Ti,Zr,Hf,Nb,Ta),and HE TMB2-3(TM=Cr,Zr,Hf,Nb,Ta)have been designed and prepared by one-step boro/carbothermal reduction.As a result of synergistic effects of strong attenuation capability and impedance match,HE TMB2-1 shows much improved performance with the optimal minimum reflection loss(RL_(min))of-59.6 dB(8.48 GHz,2.68 mm)and effective absorption bandwidth(EAB)of 7.6 GHz(2.3 mm).Most impressively,incorporating Cr in HE TMB2-3 greatly improves the impedance match over 1-18 GHz,thus achieving the RLmin of-56.2 dB(8.48 GHz,2.63 mm)and the EAB of 11.0 GHz(2.2 mm),which is superior to most other EM wave absorbing materials.This work reveals that constructing high-entropy compounds,especially by incorporating magnetic elements,is effectual in tailoring the impedance match for highly conductive compounds,i.e.,tuning electrical conductivity and boosting magnetic loss to realize highly efficient and broadband EM wave absorption with dielectric and magnetic coupling in single-phase materials. | Weiming ZHANG Fu-Zhi DAI Huimin XIANG Biao ZHAO Xiaohui WANG Na NI Rajamallu KARRE Shijiang WU Yanchun ZHOU | 2021 | Journal of Advanced Ceramics2021，10，6： | 4 |
| 2 | 创伤后深静脉血栓的预防机械预防和药物预防的前瞻性、随机性比较显示文摘背景:骨创伤后的深静脉血栓是十分重要的问题,但相关研究甚少。本研究的目的是评估两种不同方法对预防钝性创伤后深静脉血栓和肺栓塞的有效性。
方法:共有224例住院患者参与此项预防创伤后静脉血栓形成的前瞻性随机性研究。200例患者最终完成研究,比较两种不同的预防方案。A组患者在钝性创伤后24-48h内使用依诺肝素(30mg,皮下,每天两次)。B组患者在人院后使用脉冲式足泵并延迟使用依诺肝素。所有患者在出院前均行静脉核磁共振和超声检查。
结果:A组共97例患者,B组共103例患者。22例患者(A组13人,B组9人)有深静脉血栓形成,其中A组2例还发生了肺栓塞。本组深静脉血栓的发生率为11%,A组13.4%,B组8.7%;A组和B组之间的差异无统计学意义。A组出现大的或闭塞性血栓共11例(发生率11.3%),B组仅3例(发生率2.9%)(p=0.025)。A组肺栓塞的发生率为2.1%,B组为0。A组有21例患者出现伤口并发症,B组为20例。住院期间发生深静脉血栓的患者人均用血7.4单位,无深静脉血栓的患者人均用血3.9单位(p〈0.05)。
结论:结果显示严重的肌肉骨骼创伤后,早期使用机械预防(足泵)并延迟使用依诺肝素对预防深静脉血栓是相当有效的。比较两组患者,B组患者大的或闭塞性血栓的发生率明显低于A组患者。
可信水平:治疗性研究,Ⅰ级。详细的可信水平描述参见作者须知。 | JAMES P. STANNARD ROBERT R. LOPEZ-BEN DAVID A. VOLGAS EDWARD R. ANDERSON MATT BUSBEE DONNA K. KARR GERALD R. McGWIN JR. JORGE E. ALONSO 罗从风(译) 费起礼(校) | 2006 | 骨科动态2006，2，3： | 2 |
| 3 | Evaluating landscape health: integrating societal goals and biophysical process显示文摘 | D.J. Rapport C. Gaudet J.R. Karr J.S. Baron C. Bohlen W. Jackson B. Jones R.J. Naiman B. Norton M.M. Pollock | 1998 | Journal of Environmental Management1998，，1： | 2 |
| 4 | Effect of cracking on water and chloride permeability of concrete 显示文摘 | ALDEA C M SHAH S P KARR A | 1999 | J Mater Civil Eng1999，11，3： | 1 |
| 5 | Polysaccharide-degrading enzymes are unable to attack plant cell walls without prior action by a 'wall-modifying enzyme'显示文摘 | Karr L Jr Albersheim P | 1970 | Plant Physiology1970，46，： | 1 |
| 6 | A benthic index of biotic integrity (B-IBI)for rivers of the Tennessee Valley 显示文摘 | Kerans B L Karr J R | 1994 | Ecological Applications1994，4，： | 1 |
| 7 | Sustaining living rivers显示文摘 | Karr J R Chu E W | 2000 | Hydrobiologia2000，4，： | 1 |
| 8 | A benthic index of biotic integrity (B-Ibi) for rivers of the tennessee valley 显示文摘 | Kerans B L Karr J R | 1994 | Ecological Applications1994，4，4： | 1 |
| 9 | Citizen Access to Government Statistical Information显示文摘 | Karr A F | 2008 | Digital Government2008，，： | 1 |
| 10 | Discovery of the butenyl-spinosyn insecticides: Novel macrolides from the new bacterial strain Saccharopolyspora pogona显示文摘 | Paul Lewer Donald R. Hahn Laura L. Karr Dennis O. Duebelbeis Jeffrey R. Gilbert Gary D. Crouse Thomas Worden Thomas C. Sparks Pat McKamey Rex Edwards Paul R. Graupner | 2009 | Bioorganic & Medicinal Chemistry2009，，12： | 1 |
| 11 | Adhesive properties of modified soybean flour in wheat straw particleboard显示文摘 | Cheng E Z Sun X Z Karr S G | 2004 | Composites:Part A:Applied Science and Manufacturing2004，35，3： | 1 |
| 12 | Design,scale-up,and applications of the reciprocating plate extraction显示文摘 | Karr A E | 1980 | Column Separation Science and Technology1980，15，4： | 1 |
| 13 | Bidirectional incompatibility between conspecilic populations of Drosophila simulans显示文摘 | O'Neill S L Karr T L | 1990 | Nature1990，348，6297： | 1 |
| 14 | Breeding birds of isolated woodlots: area and habitat relationships 显示文摘 | Blake J G Karr J R | 1987 | Ecology1987，68，6： | 1 |
| 15 | Sustaining living rivers 显示文摘 | Karr J R Chu E W | 2000 | Hydrobiologia2000，，： | 1 |
| 16 | Developmental variability in expression and regulation of inducible nitric oxide synthase in rat intestine显示文摘 | Morin M J Karr S M Faris R A | 2001 | Am J Physiol Gastrointest Liver Physiol2001，281，2： | 1 |
| 17 | Sustaining living rivers显示文摘 | Karr J R Chu E W | 2000 | Hydrobiologia2000，，4： | 1 |
| 18 | Habitat structure and stream fish communities显示文摘 | GORMAN O T KARR J R | 1978 | Ecology1978，59，3： | 1 |
| 19 | Defining and Measuring River Health显示文摘 | Karr J R | 1999 | Freshwater Biology1999，41，： | 1 |
| 20 | Repellency of dried bay leaves (Laurus nobilis) Wrigley's spearmint gum,raw Osage orange fruit (Maclura pomifera),and extracts of orange fruit to the german cockroach显示文摘 | Coats J R | 1991 | Insecticide and Acaricide Test1991，17，： | 1 |
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