检索结果-内蒙古大学图书馆

An assessment of the potential of a single anaerobic/aerobic/anoxic airlift bioreactor for PHA production: effect of different wastewaters

引用

JOURNAL Of THE IRANIAN CHEMICAL SOCIETY 2021年第12期18卷 3341-3356页

作者： Ahmadi, f. Zinatizadeh, A. A. Asadi, A. Razi Univ Environm Res Ctr ERC Fac Chem Dept Appl Chem Kermanshah Iran Univ South Africa Coll Agr & Environm Sci Dept Environm Sci POB 392 ZA-1710 Florida South Africa Univ Yasuj Dept Gas & Petr Gachsaran *** Iran

In the present study, the interactive effects of two numerical variables, viz. feed to biomass concentration (f/M) ratio and dissolved oxygen (DO) concentration, and a categorical variable (type of carbon sources) on polyhydroxyalkanoate (PHA) production by activated sludge generated from an airlift bioreactor were evaluated. Three different carbon sources including acetate, soft drink industrial wastewater, and faraman industrial wastewater (industrial estate in Kermanshah, Iran) were used as single feed to accumulation bioreactor. The yield of PHA on substrate, specific PHA production rate, and specific substrate uptake rate were evaluated as responses. The maximum PHA content was obtained around 34.2, 4.8, and 11.3% (mg PHA/mg VSS) using acetate, soft drink industrial wastewater, and faraman industrial wastewater as carbon sources, respectively, at the optimum condition with f/M ratio of 3.5 mg COD-S/mg VSS and a DO concentration of 2 mg/L. The PHA content was mainly poly (3-hydroxybutyrate) (PHB) when acetate and soft drink industrial wastewater were used as a solo carbon source, while faraman industrial wastewater resulted in the production of copolymer P(3HB-co-3HV).

关键词： PHA production f M ratio Carbon sources DO concentration

来源：评论

学校读者我要写书评

暂无评论

Cement debonding behaviors of the various tibial components of the ATTUNE knee system and its predecessors: Is a cement-in-cement revision an alternative?

引用

KNEE 2021年 33卷 185-192页

作者： Jaeger, Sebastian Eissler, Marvin Schwarze, Martin Schonhoff, Mareike Kretzer, Jan Philippe Bitsch, Rudi G. Heidelberg Univ Hosp Lab Biomech & Implant Res Clin Orthoped & Trauma Surg Schlierbacher Landstr 200a D-69118 Heidelberg Germany Heidelberg Univ Hosp Clin Orthoped & Trauma Surg Heidelberg Germany ATOS Clin Heidelberg Heidelberg Germany

Background: Aseptic loosening remains one of the most common causes of revision of the tibial component for total knee arthroplasty. A stable bond between implant and cement is essential for appropriate long-term results. The aim of our in vitro study was to investigate the maximum failure load of tibial ATTUNE prosthesis design alternatives compared with a previous design. In addition, cement-in-cement revision was considered as a potential strategy after tibial component debonding. Methods: The experimental investigations of the maximum failure load of the implant-cement interface were performed under optimal conditions, without potential contamination. We compared the designs of the tibial components of the ATTUNE, ATTUNE S+ and P.f.C. Sigma. In addition, we investigated the cement-in-cement revision for the ATTUNE knee system replacing it with an ATTUNE S+. Results: The maximum failure load showed no significant difference between P.f.C. Sigma and ATTUNE groups (P = 0.087), but there was a significant difference between the P.f.C. Sigma and the ATTUNE S+ groups (P < 0.001). The analysis also showed a significant difference (P < 0.001) between the ATTUNE and the ATTUNE S+ groups for the maximum failure load. The ATTUNE S+ cement-in-cement revision group showed a significant higher failure load (P < 0.001) compared with the P.f.C. Sigma and ATTUNE groups. No significant differences (P = 1.000) were found between the ATTUNE S+ cement-in-cement and ATTUNE S + group. Conclusion: Based on these results, we found no design-specific evidence of increased debonding risk with the ATTUNE and ATTUNE S+ components compared with the P.f.C Sigma. furthermore, the cement-in-cement revision seems to be an alternative for the revision surgery. (c) 2021 Elsevier B.V. All rights reserved.

关键词： ATTUNE P f C Sigma Cement debonding Implant stability Cement-in-cement revision

来源：评论

学校读者我要写书评

暂无评论

Establishment of fitted Models for Topographical factors and Coexisting Plants Influencing Distribution of Natural Wild Jujube

引用

fORESTS 2023年第3期14卷 439页

作者： Wu, Yansheng Wang, Yanchao Niu, Weitao Zhang, Pengfei Wu, Lina Li, Huan Wang, Senghu Xingtai Univ Coll Biosci & Engn Xingtai 054001 Peoples R China Hebei Xingzaoren Utilizat Technol Innovat Ctr Xingtai 054001 Peoples R China

fitting mathematical models to describe the influence of topographic factors and coexisting plants on wild jujube distribution was performed to provide a scientific basis for wild jujube forestation. Investigation quadrats, with straight-line distances between adjacent quadrats of longer than 100 m, were set up in areas of wilderness or low human disturbance, which were rich in wild plant species. Data concerning altitude, slope aspect, slope position and slope degree of each investigation quadrat, as well as the type and number of coexisting wild plants, were collected. Based on this, correlations with the average number, occurrence probability and density of wild jujube and these variables were analyzed, and data models were established. Results of analyses show that topographic factors such as altitude, aspect, gradient, slope and position, play an important role in the distribution of wild jujube;and that Vitex negundo var. heterophylla (franch.) Rehd. coexistence is related to wild jujube distribution. Both average number and occurrence probability of wild jujube conform to a GaussAmp model with altitude. The highest average number was recorded at 581.24 +/- 13.78 m above sea level, and the highest occurrence probability at 462.53 +/- 36.67 m above sea level. Average number and occurrence probability of wild jujube were fit to a linear model with slope aspect-with mathematical slope 0.49 +/- 0.16-indicating that wild jujube is a light-loving and drought-tolerant plant. Average number and density of wild jujubes were fit to GaussAmp models with slope position. The highest average number and the highest density of wild jujube appears on the upper part of the middle slope. Wild jujube occurrence probability was correlated to slope degree in a quadratic equation model. With an increase in slope degree, the distribution number of wild jujube increased sharply. The survey data of slope position and slope degree further reinforced the observed drought-resistance quali

关键词： wild jujube (Ziziphus jujuba Mill var spinosa (Bunge) Hu ex H f Chow) altitude slope aspect slope position slope degree Vitex negundo var heterophylla

来源：评论

学校读者我要写书评

暂无评论

Improvement of Optical and Electrical Properties of AZO Thin films by Controlling fluorine Concentration

KOREAN JOURNAL OF MATERIALS RESEARCH

引用

KOREAN JOURNAL Of MATERIALS RESEARCH 2021年第3期31卷 150-155页

作者： Jang, Suyoung Jang, Jun Sung Jo, Eunae Karade, Vijay Chandraknt Kim, Jihun Moon, Jong-Ha Kim, Jin Hyeok Chonnam Natl Univ Dept Mat Sci & Engn 77 Youngbong Ro Gwangju 61186 South Korea Chonnam Natl Univ Optoelect Convergence Res Ctr 77 Youngbong Ro Gwangju 61186 South Korea Gwangju Inst Sci & Technol Sch Integrated Technol 123 Cheomdangwagi Ro Gwangju 61005 South Korea

Zinc oxide (ZnO) based transparent conducting oxides (TCO) thin films, are used in many applications such as solar cells, flat panel displays, and LEDs due to their wide bandgap nature and excellent electrical properties. In the present work, fluorine and aluminium-doped ZnO targets are prepared and thin films are deposited on soda-lime glass substrate using a Rf magnetron sputtering unit. The aluminium concentration is fixed at 2 wt%, and the fluorine concentration is adjusted between 0 to 2.0 wt% with five different concentrations, namely, Al2ZnO98(AZO), f(0.5)AZO(97.5)(fAZO1), f(1)AZO(97)(fAZO2), f(1.5)AZO(96.5)(fAZO3), and f(2)AZO(96)(fAZO(4)). Thin films are deposited with an Rf power of 40 W and working pressure of 5 m Ton - at 270 degrees C. The morphological analysis performed for the thin film reveals that surface roughness decreases in fAZO1 and fAZO2 samples when doped with a small amount of fluorine. further, optical and electrical properties measured for fAZO1 sample show average optical transmissions of over 89 % in the visible region and 82.5 % in the infrared region, followed by low resistivity and sheet resistance of 3.59 x 10(-4) Omega cm and 5.52 Omega/sq, respectively. In future, these thin films with excellent optoelectronic properties can be used for thin-film solar cell and other optoelectronics applications.

关键词： solar cells thin films transparent conducting electrode f Al co-doped ZnO (fAZO)

来源：评论

学校读者我要写书评

暂无评论

Resistance forms on Self-Similar Sets with finite Ramification of finite Type

引用

POTENTIAL ANALYSIS 2021年第4期54卷 581-606页

作者： Cao, Shiping Qiu, Hua Cornell Univ Dept Math White Hall Ithaca NY 14853 USA Nanjing Univ Dept Math Nanjing 210093 Peoples R China

In this paper, we introduce the finite neighboring type and the finite chain length conditions for a connected self-similar set K. We show that with these two conditions, K is a finitely ramified graph directed (f.r.g.d.) fractal defined by Hambly and Nyberg (Proc. Edinb. Math. Soc. (2) 46(1), 1-34 2003). We give some nontrivial examples and compute the harmonic structures on them explicitly. furthermore, for a f.r.g.d. self-similar set K, we provide an equivalent description, the finitely ramified of finite type (f.r.f.t.) cell structure of K, and investigate the relationship of harmonic structures associated with different f.r.f.t. cell structures of K.

关键词： fractal analysis Resistance forms f r g d fractals Graph-directed Harmonic structures

来源：评论

学校读者我要写书评

暂无评论

RAD sequencing of common whelk, Buccinum undatum, reveals fine-scale population structuring in Europe and cryptic speciation within the North Atlantic

引用

ECOLOGY AND EVOLUTION 2021年第6期11卷 2616-2629页

作者： Goodall, Jake Westfall, Kristen Marie Magnusdottir, Hildur Palsson, Snaebjorn Ornolfsdottir, Erla Bjork Jonsson, Zophonias O. Univ Iceland Fac Life & Environm Sci Reykjavik Iceland Holar Univ Dept Aquaculture & Fish Biol Sauoarkrokur Iceland Vor Marine Res Ctr Breioafjorour Olafsvik Iceland Fisheries & Oceans Canada Pacific Biol Stn Nanaimo BC Canada

Buccinum undatum is a subtidal gastropod that exhibits clear spatial variation in several phenotypic shell traits (color, shape, and thickness) across its North Atlantic distribution. Studies of spatial phenotypic variation exist for the species;however, population genetic studies have thus far relied on a limited set of mitochondrial and microsatellite markers. Here, we greatly expand on previous work by characterizing population genetic structure in B. undatum across the North Atlantic from SNP variation obtained by RAD sequencing. There was a high degree of genetic differentiation between Canadian and European populations (Iceland, faroe Islands, and England) consistent with the divergence of populations in allopatry (f-ST > 0.57 for all pairwise comparisons). In addition, B. undatum populations within Iceland, the faroe Islands, and England are typified by weak but significant genetic structuring following an isolation-by-distance model. finally, we established a significant correlation between genetic structuring in Iceland and two phenotypic traits: shell shape and color frequency. The works detailed here enhance our understanding of genetic structuring in B. undatum and establish the species as an intriguing model for future genome-wide association studies.

关键词： divergence f (ST) genetics phylogeography speciation

来源：评论

学校读者我要写书评

暂无评论

Performance of Asphalt Mastic and Asphalt Mixture with Harmless Municipal Solid Waste Incineration fly Ash

引用

BUILDINGS 2023年第2期13卷 498页

作者： Li, Erxin Zhang, Xiangyu Wang, Liyong Wang, Rui Zhang, Wei Chen, Chengqin Zhang, Wengang Highway Dev Ctr Gansu Prov Lanzhou 730030 Peoples R China China Highway Engn Consulting Corp Beijing 100089 Peoples R China Northwest Minzu Univ Sch Civil Engn Lanzhou 730030 Peoples R China Shandong Univ Technol Sch Civil & Architectural Engn Zibo 255049 Peoples R China

In this paper, harmless municipal solid waste incineration fly ash (H-MSWIfA) was used to replace part of the mineral powder in asphalt mastic prepared with different ratios of filler to asphalt (f/A). Cone penetration (CPT), rotational viscosity, low-temperature bending, and full section fracture energy(fSfET) tests on the prepared H-MSWIfA asphalt mastic were carried out to evaluate the viscosity at room temperature, viscosity at high temperature, tensile property at low temperature, and crack resistance at room temperature of the asphalt mastic with different f/A and different H-MSWIfA content. An asphalt concrete mixture with a nominal maximum particle size of 13 mm (AC-13) with different f/A and H-MSWIfA replacement ratios was prepared. The effects of f/A and H-MSWIfA content on the high-temperature stability, water stability, and low-temperature cracking resistance of the asphalt mixture were studied. The results showed that the shear strength and viscosity of the asphalt mastic increased after H-MSWIfA replaced part of the mineral powder;and the greater the f/A, the greater the shear strength and viscosity of the asphalt mastic. H-MSWIfA can greatly improve the viscosity of asphalt mastic at high temperatures, and with the increase in H-MSWIfA content, the improvement effect becomes more obvious. The high-temperature stability of the asphalt mixture is not related to H-MSWIfA content but mainly depends on the f/A. Both the f/A and the H-MSWIfA replacement ratio can significantly affect the water stability of the asphalt mixture, specifically, the water stability reaches the best value when the f/A is around 1.0, and the addition of H-MSWIfA harms water stability. Both the f/A and the H-MSWIfA replacement ratio can significantly affect the low-temperature cracking resistance of the asphalt mixture. The higher the f/A, the worse the low-temperature crack resistance. At the same time, the addition of H-MSWIfA harms low-temperature cracking resistance. from the p

关键词： H-MSWIfA f A H-MSWIfA content asphalt mastic asphalt mixture

来源：评论

学校读者我要写书评

暂无评论

Thermal stability and oxidation resistance of non-equimolar ratio AlTiVCrNb refractory high-entropy alloys

引用

INTERMETALLICS 2023年第1期160卷

作者： Xu, Tong Chen, Qingjun Ji, Li Wang, Hao Qu, Shoujiang feng, Aihan Nanchang Hangkong Univ Sch Mat Sci & Engn Nanchang 330063 Peoples R China Univ Shanghai Sci & Technol Interdisciplinary Ctr Addit Mfg ICAM Sch Mat & Chem Shanghai 200093 Peoples R China Tongji Univ Sch Mat Sci & Engn Shanghai 201804 Peoples R China

In this work, we investigated the thermal stability, oxidation resistance and high temperature mechanical properties of refractory high entropy alloys Ti75Al10V5Cr5Nb5, Ti67Al12V7Cr7Nb7 and Ti55Al15V10Cr10Nb10(at.%). It is found that the second phase would be precipitated and occurs order-disorder transformation in refractory high entropy alloys at high temperature. The HCP phase produced orderly B2 phase and decreased the orderly B2 phase precipitation with the increasement of temperature in Ti67Al12V7Cr7Nb7 and Ti55Al15V10Cr10Nb10. According to the oxidation kinetics of high entropy alloys after 100h oxidation at 800 degrees C, the oxidation index factor n is between 1.1 and 1.2 and the degree of oxidation is between oxidized and inoxidized, all three refractory high entropy alloys formed oxides with rutile structure, the Ti67Al12V7Cr7Nb7 being less oxidation resistant due to the generation of Nb2O5 which is less stable at high temperature. Ti67Al12V7Cr7Nb7 has a yield strength of 522 MPa with 50% elongation at 650 degrees C. Ti75Al10V5Cr5Nb5 and Ti67Al12V7Cr7Nb7 have lower strength but 150% deformation without fracture when stretched at 750 degrees C. The multi-component intermetallic compound nanoparticles formed by the second phase and ordered phase together in the refractory high entropy alloys have an Orowan strengthening effect, to improve the mechanical properties at high temperature since it effectively prevents dislocation movement and stores dislocations.

关键词： A High -entropy alloys B Thermal stability Oxidation f X -ray diffraction Mechanical testing

来源：评论

学校读者我要写书评

暂无评论

Terrestrial animal livers as a source of PCDD/fs, PCBs and PBDEs in the diet

引用

SCIENCE Of THE TOTAL ENVIRONMENT 2023年第1期867卷 161508页

作者： Pietron, Wojciech Jerzy Warenik-Bany, Malgorzata Natl Vet Res Inst Radiobiol Dept PL-24100 Pulawy Poland

The livers of terrestrial animals are an important source of vitamins and minerals, but with the liver being the major filtering and detoxifying organ, it retains xenobiotic material, especially persistent organic pollutants (POPs). The aim of the study was human health risk assessment related to the presence of certain POPs, namely polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/fs), polychlorinated biphenyls (PCBs), and polybrominated diphenyl ethers (PBDEs) in terrestrial animals' livers. HRGC-HRMS was used to determine analyte concentrations in 99 liver samples of chicken, pork, beef, and mutton livers obtained from Polish farms. The ovine livers were the most contam-inated by IPCDD/f/dl-PCBs (0.06-2.21 pg WHO-TEQ g-1 wet weight), Indl-PCBs (0.036-1.54 ng g-1 wet weight) and IPBDEs (0.21-2.27 ng g-1 wet weight). Samples were found of ovine and pork livers that exceeded the maximum concentration limits established for PCDD/fs. The Kruskal-Wallis test showed that there were statistical differences between regions in the concentrations of the IPCDD/fs and IPCDD/f-PCBs, but none in those of the Idl-PCBs, Indl-PCBs or IPBDEs. According to Dunnett's test results, ovine liver samples from the Podlaskie province contained fewer IPCDD/f than those from the Dolnoslaskie (p < 0.027) and Malopolskie (p < 0.0342) voivodeships. Taking into account PCDD/f contents and Tolerable Weekly Intake (2 pg WHO-TEQ/kg BW) (TWI2018), the lowest risk was asso-ciated with chicken liver consumption (TWI up to 11 % in the 95th percentile), pork (62 %) and bovine (92 %) livers should be eaten in limited amounts for risk avoidance, while mutton liver (400 %) should not be eaten at all. Addition-ally, there is no risk of ingestion of a harmful amount of PBDEs associated with consumption of the livers of terrestrial animals from Poland based on the margin of exposure values (>15).

关键词： Liver PCDD f PCB PBDE Exposure Risk assessment

来源：评论

学校读者我要写书评

暂无评论

Influence of annealing on microstructure and cavitation erosion resistance of iron-based metallic glass coatings synthesized by HVOf thermal spraying

引用

INTERMETALLICS 2023年第1期161卷

作者： Qiao, Lei Wu, Yuping Hong, Sheng Cheng, Jiangbo Zhu, Shuaishuai Hohai Univ Coll Mech & Mat Nanjing 211100 Peoples R China Jiangsu Univ Sci & Technol Sch Mat Sci & Engn Zhenjiang 212003 Peoples R China Nanjing Inst Technol Sch Mat Engn Nanjing 211167 Peoples R China

This study aimed to deposit a novel iron-based metallic glass coating onto 316L stainless steel and analyze the microstructures, phases, mechanical properties, and cavitation erosion resistances of the as-sprayed and annealed coatings. The coatings were annealed at temperatures of 540, 640, and 740 degrees C, resulting in varying crystal contents. As the annealing temperature increased, the amorphous content of the iron-based coatings decreased from 90% to 62%, 35%, and 29%, respectively, while the microhardness increased from 849 HV0.2 to 944, 970, and 860 HV0.2, respectively. The coating annealed at 640 degrees C exhibited the best resistance to cavitation erosion, whereas the coating annealed at 740 degrees C had the poorest resistance. Cavitation erosion always initiated from defects in the amorphous/nanocrystal coatings, such as pores, microcracks, or phase interfaces, and then propagated along these defects, eventually causing the stripping of particles. During cavitation erosion, the wellbound particles fragmented under repeated shocks, and the amorphous phase crystallized into nanocrystals, leading to detachment of particles in small sizes.

关键词： A metallic glasses B annealing cavitation C coatings D microstructure f electron microscopy Scanning

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：