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| 1 | Microstructure and giant baro-caloric effect induced by low pressure in Heusler Co_(51)Fe_(1)V_(33)Ga_(15) alloy undergoing martensitic transformation显示文摘Solid-state refrigeration based on the magneto-or mechano-caloric effect,including elasto-and barocaloric in ferroic phase transition materials is promising to replace the current vapor compression refrigeration in consideration of environmental-friendliness and energy-saving.However,both high driven field and small thermal changes in all of these caloric materials hinder the development of solid-state refrigeration.Here we report a giant baro-caloric effect near room temperature induced by a low hydrostatic pressure in Co-based Co_(51)Fe_(1) V_(33)Ga_(15) Heusler alloy.The maximum adiabatic temperature change under the applied pressure change ofΔp=0.1-100 MPa can be as high asΔ_(Tad)^(Max)=7.7 K(Δ_(Tad)^(Max)/Δpreaches up to~7.7 K kbar-1),surpassing theΔ_(Tad)^(Max)/Δpvalue reported hitherto in baro-caloric alloys.In addition,the microstructure is also studied by using the electron microscopes.Along with the austenite and martensite,the submicron V-rich particles are precipitated in this alloy,which are believed to account for enhancing mechanical properties. | Kai Liu Hai Zeng Ji Qi Xiaohua Luo Xuanwei Zhao Xianming Zheng Yuan Yuan Changcai Chen Shengcan Ma Ren Xie Bing Li Zhenchen Zhong | 2021 | Journal of Materials Science & Technology2021，，14： | 2 |
| 2 | Discussion on Individual Expected Maturity Age of Populus tomentosa Carr显示文摘Through the study of parse wood materials in Shandong Province,the fitting empirical equation of tree growth was obtained,a function with tree growth was a variable and time as an independent variable. Through mathematical operations such as function derivation,the mature age of tree growth was obtained. The obtained expected maturity age for Populus tomentosa forest was 11 a for pulp material,26 a for pillar materials and 41 a for peeler. And the application,research directions and precautions of the mature ages were proposed. | Changgang WANG Xuanwei MA Ailing Li Jinzhi ZHANG | 2018 | Agricultural Biotechnology2018，7，4： | 1 |
| 3 | Study on Correlation between Increment of Larix gmelinii and Annual Precipitation显示文摘Through the study on data of analytic tree,the fitting empirical equation for tree growth was obtained,i. e.,the function with increment as variable and annual precipitation as the independent variable. The threshold value of annual precipitation for tree growth was obtained through mathematical operation including derivation. It was concluded that Larix gmelinii grows the fast under the annual precipitation of about 545. 1 mm,and negative growth would occur if the annual precipitation is lower than 349 mm and higher than 1 132. 8 mm. Furthermore,the application value,research direction and matters needing attention were pointed out. | Xuanwei MA Changgang WANG Jilu QIN Jinzhi ZHANG | 2018 | Agricultural Biotechnology2018，7，4： | 0 |
| 4 | Large magnetocaloric effect and magnetoresistance in ErNi single crystal显示文摘The magnetic properties,magnetocaloric effect and magnetoresistance in Er Ni single crystal have been investigated in detail.With decreasing temperature,Er Ni single crystal undergoes two successive magnetic transitions:a paramagnetic to ferromagnetic transition at T_(C)=11 K and a spin-reorientation transition at TS_(R)=5 K.Meanwhile,a sharp field-induced metamagnetic transition is observed below the T_(C)along the a axis.Er Ni single crystal possesses a giant magnetocaloric effect around T_(C).The maximum magnetic entropy change is-36.1 J(kg K)^(-1)along the a axis under the field change of 0-50 k Oe.In particular,the rotating magnetocaloric effect in Er Ni single crystal reaches its maximum under a relatively low field,and the maximum rotating entropy change with a value of 9.3 J(kg K)^(-1)is obtained by rotating the applied field from the[011]to[100]directions under 13 k Oe.These results suggest that Er Ni could be a promising candidate for magnetic refrigeration working at liquid-helium temperature region.Moreover,a complicated transport behavior is uncovered in Er Ni single crystal,which is attributed to the complex magnetic states and magnetic polaronic effect.Both positive and negative magnetoresistance are observed.A considerable large magnetoresistance with the value of-34.5%is acquired at 8 K under50 k Oe when the field is along the[100]direction. | Xuanwei Zhao Xianming Zheng Xiaohua Luo Fei Gaod Hai Zeng Guang Yu Sajjad Ur Rehman Changcai Chen Shengcan Ma Weijun Ren Zhenchen Zhong | 2021 | Journal of Materials Science & Technology2021，，27： | 0 |
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