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Nie, Haitao,Wang, Ziyu,You, Jihao,Zhu, Gang,Wang, Hengchang,Wang, Feng Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.1
Objective: The effects of Pleurotus ostreatus on the feed utilization of broad bean stalks (BBS), rape straw (RS), paddy straw (PS), and corn stalk (CS) was examined. Methods: The four roughages were co-cultured with Pleurotus ostreatus. The chemical composition; enzyme activities of laccase, carboxymethylcellulase (CMCase) and xylanase; carbohydrate and protein fractions (based on The Cornell Net Carbohydrate and Protein System [CNCPS]) were assessed at different days after inoculation (7, 14, 21, 28 d) and un-inoculated roughages (control, 0 d). The digestibility of nutrient components and the gas production of roughage with various incubation times were monitored at 0, 2, 4, 6, 9, 12, 24, 36, 48, 60, and 72 h using an in vitro ruminal fermentation method. Results: A higher CMCase activity (0.1039 U/mL) and earlier time to peak (14 d) were detected in Pleurotus ostreatus cultured with CS (p<0.05). Significantly, the incubation length-dependent responses of cumulative gas production were observed from 24 to 72 hours post fermentation (p<0.05), and these incubation length-dependent effects on cumulative gas production of PS and CS appeared earlier (24 h) for PS and CS than those (48 h) for BBS and RS (p<0.05). The fast-degradable carbohydrate (CA) content for all four roughages significantly increased over time (p<0.05). Nonetheless, increased degradation efficiency for CA treated with Pleurotus ostreatus was detected at both 21 and 28 days of incubation (p<0.05). With the exception of PS (p<0.05), there were no significant difference among the roughages (p>0.05) in slowly-degradable carbohydrate (CB2) at different incubation times (p<0.05). Conclusion: Assessment of the alterations in chemical composition, CNCPS system fractions, and the fermentation kinetics after biological pretreatment may yield a valuable database for evaluating the biological pretreatment of Pleurotus ostreatus in ruminant feed.
Mechanical induced electrical failure of shock compressed PZT95/5 ferroelectric ceramics
Hengchang Nie,Jia Yang,Xuefeng Chen,Fuping Zhang,Yin Yu,Genshui Wang,Yusheng Liu,Hongliang He,Xianlin Dong 한국물리학회 2017 Current Applied Physics Vol.17 No.4
A comparative experimental study of shock compressed Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 (hereafter referred to as PZT95/5) ferroelectric ceramics within different insulation materials were performed in this study. It was found that the insulating materials play a significant role in the electrical failure behavior of PZT95/5 ferroelectric ceramic. The electrical breakdown behavior of PZT95/5 ferroelectric ceramics within epoxy resin was observed to aggravate at low temperature 55 C. Porous PZT95/5 ferroelectric ceramic was found to exhibit lower failure probability than its dense counterpart. Electrical failure of PZT95/5 ferroelectric ceramics under shock wave was found to be an extrinsic behavior and a tentative explanation was proposed based on the mechanical compressive stress-induced cracks initiation by epoxy resin.
Hengchang Bu,Qiyu Gao,Yun Li,Feiyun Wang,Xiaohong Zhan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Ti–6Al–4V alloy plates with a thickness of 4 mm were joined by electron beam welding (EBW) and laser beam welding(LBW). The comparison of LBW and EBW was performed according to grain morphology, microstructure, aluminum distribution,and microhardness of the joints. Results indicate that compared with LBW joint, more equiaxed grains are observedaround the central zone of the EBW joint. The microstructure in fusion zone (FZ) of EBW joint presents more uneven withobviously coarser acicular martensite α′. Moreover, the aluminum element content of EBW joint is substantially lower,which demonstrates a more significant burning loss behavior in EBW process. The lower aluminum content in the uppercenter areas of the joints is attributed to the more significant element burning loss caused by higher temperature, whereasmore uniform aluminum distribution in the upper part of the joints is ascribed to stronger convection form within the upperpart of the joint. In addition, the characteristics of convection and thermal field within the molten pool are recognized asvital factors influencing the aluminum distribution. The lower microhardness profile in FZ of the EBW joint is principallyattributed to coarser acicular martensite α′ and lower aluminum element in EBW joint.
Depoling of porous Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ferroelectric ceramics under shock wave load
Ningbo Feng,Hengchang Nie,Xuefeng Chen,Genshui Wang,Xianlin Dong,Hongliang He 한국물리학회 2010 Current Applied Physics Vol.10 No.6
Poled Pb0.99(Zr0.95Ti0.05)0.98Nb0.02O3 ferroelectric ceramics in different porosity depoled under shock wave load. Porosity and material dielectric characteristic effects on the depoling current evolution were discussed. The results showed that under open circuit condition, the dielectric constant of all samples exhibited obvious increase, but as the porosity increased, the dielectric constant decreased. As a result of lower dielectric constant of porous samples during depoling process, the charge-releasing rate is faster than that of dense sample.
Manufacturing of GaAs MMICs for Wireless Communications Applications
Ho, Wu-Jing,Liu, Joe,Chou, Hengchang,Wu, Chan Shin,Tsai, Tsung Chi,Chang, Wei Der,Chou, Frank,Wang, Yu-Chi The Institute of Electronics and Information Engin 2006 Journal of semiconductor technology and science Vol.6 No.3
Two major processing technologies of GaAs HBT and pHEMT have been released in production at Win Semiconductors corp. to address the strong demands of power amplifiers and switches for both handset and WLAN communications markets. Excellent performance with low processing cost and die shrinkage features is reported from the manufactured MMICs. With the stringent tighter manufacturing quality control WIN has successfully become one of the major pure open foundry house to serve the communication industries. The advancing of both technologies to include E/D-pHEMTs and BiHEMTs likes for multifunctional integration of PA, LNA, switch and logics is also highlighted.
Libing Chen,Ruihong Liang,Genshui Wang,Hengchang Nie,Zhiyong Zhou,Fei Cao,Xianlin Dong 한국물리학회 2014 Current Applied Physics Vol.14 No.11
Pure and Nb-doped Pb(Zr1xTix)O3 (x ¼ 0.47, 0.48, 0.50) ceramics were prepared by conventional solidstate reaction technique. Dielectric anomalies are observed in both kinds of samples near room temperature. The anomalies could be depressed by donor doping and prefer to be significant in ceramics with tetragonal crystallographic phase. Phase transition mechanism and domain wall pinning effect are proposed to explain this anomaly, and the former is considered as the dominated reason. Further results of the pyroelectric measurements confirm the existence of the ferroelectriceferroelectric phase transition.
Manufacturing of GaAs MMICs for Wireless Communications Applications
Wu-Jing Ho,Joe Liu,Hengchang Chou,Chan Shin Wu,Tsung Chi Tsai,Wei Der Chang,Frank Chou,Yu-Chi Wang 대한전자공학회 2006 Journal of semiconductor technology and science Vol.6 No.3
Two major processing technologies of GaAs HBT and pHEMT have been released in production at Win Semiconductors corp. to address the strong demands of power amplifiers and switches for both handset and WLAN communications markets. Excellent performance with low processing cost and die shrinkage features is reported from the manufactured MMICs. With the stringent tighter manufacturing quality control WIN has successfully become one of the major pure open foundry house to serve the communication industries. The advancing of both technologies to include E/D-pHEMTs and BiHEMTs likes for multifunctional integration of PA, LNA, switch and logics is also highlighted.
Yibo Yang,Baixi Chen,Weizhen Zeng,Yanjun Li,Qiaohui Chen,Wenying Guo,Hengchang Wang,Yingqin Chen 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.5
To reduce the cost of lightweight concrete (LWC) partition panels and to address recycling concrete waste, this work utilized completely recycled fine aggregate (CRFA) to replace the natural fine aggregate and ceramsite in the preparation of LWC and LWC partition panels. To this end, an autoclave-free curing process and an air-entraining agent were used to prepare the CRFA-LWC. The workability, compressive strength, drying shrinkage, and pore structure of the CRFA-LWC and the performance of the CRFA-LWC partition panels were then investigated. The results show that the optimal ratio of the CRFA to the cement is 2.2 for the lightweight concrete, and the optimal panel cross section is a rounded rectangular one. All the pores in the CRFA-LWC have a diameter of smaller than 0.17 mm, and the diameter of 89% of them is less than 0.05 mm. In order to satisfy the drying shrinkage requirements stipulated by Chinese code JC/T 169-2016, the CRFA-LWC should be cured for at least 10 days. The economic analysis concludes that the material cost of CRFA-LWC is 40% lower than that of the autoclaved ceramsite concrete. In addition, utilizing CRFA in lightweight concrete can ease the shortage of natural aggregate.
Performances of Concrete Columns with Modular UHPC Permanent Formworks Under Axial Load
Yibo Yang,Baixi Chen,Yong Chen,Huanyang Zhou,Fucai Liu,Xiangming Xie,Junsheng Chen,Wenying Guo,Hengchang Wang 한국콘크리트학회 2023 International Journal of Concrete Structures and M Vol.17 No.5
This research proposed the modular prefabricated permanent formwork system made of ultra-high-performance concrete (UHPC). Two kinds of modular formwork shapes were designed: the flat formwork and the ribbed. The experimental investigation on the axial compression performance of the composite columns that consist of the normal strength concrete (NSC) core and the modular UHPC permanent formwork was demonstrated. Compared with the flat formwork, the ribbed formwork exhibited better bonding with the NSC core. As observed from the test results, the composite column with the ribbed formwork presented a similar axial behavior as the NSC column with a slight improvement in ultimate loads. Therefore, the modular UHPC ribbed permanent formwork could be regarded as the additional cover to the conventional NSC column. In addition, the finite element analysis (FEA) model was also developed to simulate the composite columns numerically. The predicted capacities agreed with the experimental results, which validated the numerical models. The crack pattern estimated by the FEA model revealed that the interaction between the permanent formwork and the inner concrete introduced many tiny cracks to the concrete core. However, as protected by the UHPC permanent formwork, the overall durability of the composite columns can still be enhanced.