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| 1 | MODELLING AND STABILITY ANALYSIS OF POPULATION GROWTH WITH SPATIAL DIFFUSION显示文摘In recent years, population growth models with spatial diffusion have beenextensively studied by many authors (for example, see [1-5]). In this paper, a populationgrowth model is considered with a discrete age-dependence and spatial diffusion, and isinvestigated in a semigroup framework. The spectral properties of the population oper-ator are given. On the basis of such spectral consideration, the asymptotic behaviourof the semigroup generated by the population operator is obtained. Finally, a nonlinearpopulation growth model is considered and its stability is analyzed. | W.L.CHAN FENG Dexing Department of Mathematice,the Chinese University of Hong Kong,Shatin,N.T,Hong Kong Institute oj Systems Science, Academia Sinica, Beijing 100080, China | 1993 | Systems Science and Mathematical Sciences1993，6，4： | 10 |
| 2 | Extrusion-based additive manufacturing of Mg-Zn alloy scaffolds显示文摘Porous biodegradable Mg and its alloys are considered to have a great potential to serve as ideal bone substitutes.The recent progress in additive manufacturing(AM) has prompted its application to fabricate Mg scaffolds with geometrically ordered porous structures.Extrusionbased AM,followed by debinding and sintering,has been recently demonstrated as a powerful approach to fabricating such Mg scaffolds,which can avoid some crucial problems encountered when applying powder bed fusion AM techniques.However,such pure Mg scaffolds exhibit a too high rate of in vitro biodegradation.In the present research,alloying through a pre-alloyed Mg-Zn powder was ultilized to enhance the corrosion resistance and mechanical properties of AM geometrically ordered Mg-Zn scaffolds simultaneously.The in vitro biodegradation behavior,mechanical properties,and electrochemical response of the fabricated Mg-Zn scaffolds were evaluated.Moreover,the response of preosteoblasts to these scaffolds was systematically evaluated and compared with their response to pure Mg scaffolds.The Mg-Zn scaffolds with a porosity of 50.3% and strut density of 93.1% were composed of the Mg matrix and MgZn2second phase particles.The in vitro biodegradation rate of the Mg-Zn scaffolds decreased by 81% at day 1,as compared to pure Mg scaffolds.Over 28 days of static immersion in modified simulated body fluid,the corrosion rate of the Mg-Zn scaffolds decreased from 2.3± 0.9 mm/y to 0.7±0.1 mm/y.The yield strength and Young’s modulus of the Mg-Zn scaffolds were about 3 times as high as those of pure Mg scaffolds and remained within the range of those of trabecular bone throughout the biodegradation tests.Indirect culture of MC3T3-E1 preosteoblasts in Mg-Zn extracts indicated favorable cytocompatibility.In direct cell culture,some cells could spread and form filopodia on the surface of the Mg-Zn scaffolds.Overall,this study demonstrates the great potential of the extrusion-based AM Mg-Zn scaffolds to be further developed as biodegradable bone-substituting biomaterials. | J.Dong N.Tümer M.A.Leeflang P.Taheri L.E.Fratila-Apachitei J.M.C.Mol A.A.Zadpoor J.Zhou | 2022 | Journal of Magnesium and Alloys2022，10，9： | 2 |
| 3 | Anchors Aweigh:A Demonstration of Cross Modality Anchoring and magnitude priming显示文摘 | Oppenheimer D.M LeBocuf R.A Brewer N.T | | 0，，02： | 1 |
| 4 | μ-opioid receptor activation in the basolateral amygdala mediates the learning of increases but not decreases in the incentive value of a food reward显示文摘 | Wassum K.M Cely I.C Balleine B.W Maidment N.T | | 0，，05： | 1 |
| 5 | Differential dependence of Pavlovian incentive motivation and instrumental incentive learning processes on dopamine signaling显示文摘 | Wassum K.M Ostlund S.B Balleine B.W Maidment N.T | | 0，，： | 1 |
| 6 | Enhancing career development through the career success club显示文摘 | Wessel R.D Christian N.T Hoff A.K | | 0，，29： | 1 |
| 7 | Isolation and identification of phosphatidic acid targets from plants显示文摘 | Testerink C Dekker H.L Lim Z.Y Johns M.K Holmes A.B Koster C.G Ktistakis N.T and Munnik T | | 0，，04： | 1 |
| 8 | 查看详情显示文摘 | Whilton N.T Vickers P.J Mann S J | | 0，，： | 1 |
| 9 | The application of neural networks to vibrational diagnostics for multiple fault conditions显示文摘 | Hoffman A.J van der Merwe N.T | | 0，，02： | 1 |
| 10 | Perceptions of sole practitioners on ethics training in the profession显示文摘 | Eynon G Hill N.T Stevens K.T | | 0，，04： | 1 |
| 11 | Identification and characterization of lpfABCC'DE,a fimbrial operon of enterohemorrhagic Escherichia coli O157:H7显示文摘 | Torres A.G Giron J.A Perna N.T | | 0，，： | 1 |
| 12 | Suicidal ideation among medical students and young physicians:A nationwide and prospective study of prevalence and predictors显示文摘 | Tyssen R Vaglum P Gronvold N.T Ekeberg O | | 0，，01： | 1 |
| 13 | 查看详情显示文摘 | Tang J.K Hewitt I Madhu N.T Chastanet G. Wernsdorfer W. Anson C.E. Benelli C. Sessoli R. Powell A K | | 0，，： | 1 |
| 14 | 查看详情显示文摘 | Zimmerrnan H Kim N.T | | 0，，10： | 1 |
| 15 | 查看详情显示文摘 | Hoang S Guo S Hahn N.T Bard A.J Mullins C.B | | 0，，： | 1 |
| 16 | The Approach to Carrier Scheme Convergence Based on 4-Weighted Fractional Fourier Transform显示文摘 | MEI L SHA X.J ZHANG N.T | | 0，，06： | 1 |
| 17 | The immunobiology of gastrointestinal nematode infections in ruminants显示文摘 | Adam Balic Vernon M Bowles Els N.T Meeusen | 2000 | Advances in Parasitology2000，，： | 1 |
| 18 | Recent Results in French Research on Reinforced Earth显示文摘 | Schlosser F Long N.T | | 0，，03： | 1 |
| 19 | The effect of accounting restatements on earnings revisions and the estimated cost of capital显示文摘 | Hribar Jenkins N.T | | 0，，： | 1 |
| 20 | 查看详情显示文摘 | D.M.Chien N.N.Viet N.T.K. Van N.T P.Phong | | 0，，03： | 1 |
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