检索结果-内蒙古大学图书馆

2012 International Conference on Environmental and Materials Engineering(EME 2012)

作者： Phanawan Whangdee Siritida Chukasorn Viritpon Srimaneepong Tomoaki Watanabe Dujreutai Pongkao Kashima Research Unit of Advanced Ceramics Department of Materials ScienceFaculty of ScienceChulalongkorn University Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Unit Cell for Research and Development of Herbs and Natural Products for Dental Application Chulalongkorn University Department of Prosthetic Dentistry Faculty of DentistryChulalongkorn University Department of Applied Chemistry School of Science and TechnologyMeiji University

Anodization of Ti-6Al-4V is crucial for dental implants because it promotes the roughness,chemical species and hydrophilicity of the surface that leads to its *** anodized film was prepared by the galvanostatic method at a low current density in either 1 M HPO or 1 M NaOH as the *** as-anodized film showed a significant decrease in the water contact angle,likely to be due to an increased surface roughness（as revealed by scanning electron and atomic force microcopy）and change in the surface species（as revealed by X-ray photoelectron spectroscopy,XPS）.XPS analyses confirmed that the Ti2p spectra scarcely changed while the O1s spectra significantly changed due to Ti-OH ***,the O/Ti ratio of the as-anodized film was *** results suggest that anodization by the galvanostatic method at a low current density in 1 M HPO or 1 M NaOH could enhance the surface roughness and chemical surface species,and that both are likely to be important factors for enhancing the hydrophilicity of the anodized films.

关键词： Ti-6Al-4V Roughness Surface species Hydrophilicity Anodize Low current density

来源：评论

学校读者我要写书评

暂无评论

The pigment transporter Redboy confers programmed body colour transition in orchid mantises

引用

Nature ecology & evolution 2025年 2025 May 30页

作者： Xiao-Jin Pei Dong Zhao Jie Luo Pei-Yao Jia Yuan Luo Dong-Wei Yuan Wen-Xin Hou Zhan-Feng Zhang Dan-Yan Huang Jia-Xin Ni Hui-Ze Gao Zhanqi Chen Yun-Xia Luan Xue-Xin Chen Wei Zhang Sheng Li Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology Guangzhou Key Laboratory of Insect Development Regulation and Application Research Institute of Insect Science and Technology School of Life Sciences South China Normal University Guangzhou China. Guangmeiyuan R&D Center Guangdong Provincial Key Laboratory of Insect Developmental Biology and Applied Technology South China Normal University Meizhou China. Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou China. State Key Laboratory of Gene Function and Modulation Research School of Life Sciences Peking University Beijing China. Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University Beijing China. State Key Laboratory of Crop Stress Biology for Arid Areas and Key Laboratory of Integrated Pest Management on Crops in Northwestern Loess Plateau Ministry of Agriculture and Rural Affairs Northwest A&F University Yangling People's Republic of China. Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden Chinese Academy of Sciences Yunnan China. Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou China. xxchen@***. Ministry of Agriculture and Rural Affairs Key Lab of Molecular Biology of Crop Pathogens and Insect Pests Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province Institute of insect Sciences Zhejiang University Hangzhou China. xxchen@***. State Key Laboratory of Gene Function and Modulation Research School of Life Sciences Peking University Beijing China. weizhangvv@***. Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University Beijing China. weizhangvv@***. Institute of Ecology Peking University Beijing China. weizhangvv@***. Institute for Tibetan Plateau Research Peking University Beijing China. weizhangvv@***. Medog Biodiversity Observation and Research Station of Xizang Autonomous Region Nyingchi China

Programmed phenotypic transition is prevalent throughout the tree of life, yet the concrete mechanisms that underpin this phenomenon are poorly understood. The orchid mantis (Hymenopus coronatus, Mantodea) is a model study system for programmed body colour transitions that displays a prominent black-red body colour in first-instar nymphs, then switches to a flowery white body colour in later-instar nymphs. Here we reveal that this body colour transition is achieved by the simultaneous excretion of decarboxylated-xanthommatin (red pigment) and the accumulation of uric acid (white pigment) in the epidermis during the first moult. This change in pigmentation is associated with a novel subtype of ABCG pigment transporter that we call 'Redboy' in Polyneoptera, which is upregulated by insect steroid hormone (ecdysone) during the first moult of orchid mantises. RNAi assay and pigment analyses show that Redboy functions together with the co-transporter White, exporting red pigments from and concurrently importing white pigments into the epidermal cells. Spectral reflectance analyses and predation experiments reveal that Redboy-conferred programmed body colour transition enhances predator avoidance during the first instar, and both prey attraction and predator avoidance in later instars. Our findings clarify how gene family evolution and hormone regulation coordinate programmed phenotypic transition and promote ecological adaptation in orchid mantises.

关键词：

来源：评论

学校读者我要写书评

暂无评论

An in-situ defect passivation through a green anti-solvent approach for high-efficiency and stable perovskite solar cells

引用

science Bulletin 2021年第14期66卷 1419-1428,M0004页

作者： Chang Liu Lei Huang Xianyong Zhou Xingzhu Wang Jianxi Yao Zhike Liu Shengzhong Frank Liu Wanli Ma Baomin Xu Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Energy Conversion and Storage Technologies(Southern University of Science and Technology) Ministry of EducationShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education) Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Laborartory for Advanced Energy TechnologySchool of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China

Surface and grain boundary defects in halide perovskite solar cells are highly detrimental,reducing efficiencies and *** halide anion and organic cation defects usually aggravate ion diffusion and material degradation on the surfaces and at the grain boundaries of perovskite *** this study,we employ an in-situ green method utilizing nontoxic cetyltrimethylammonium chloride(CTAC)and isopropanol(IPA)as anti-solvents to effectively passivate both surface and grain boundary defects in hybrid *** vacancies can be readily passivated by the chloride group due to its high electronegativity,and cation defects can be synchronously passivated by the more stable cetyltrimethylammonium *** results show that the charge trap density was significantly reduced,while the carrier recombination lifetime was markedly *** a result,the power conversion efficiency of the cell can reach 23.4%with this in-situ green *** addition,the device retains 85%of its original power conversion efficiency after 600 h of operation under illumination,showing that the stability of perovskite solar cells is improved with this in-situ passivation *** work may provide a green and effective route to improve both the stability and efficiency of perovskite solar cells.

关键词： Perovskite solar cells In-situ defect passivation Green anti-solvent

来源：评论

学校读者我要写书评

暂无评论

Assignment testers: towards a combinatorial proof of the PCP-theorem

Assignment testers: towards a combinatorial proof of the PCP...

引用

Annual IEEE Symposium on Foundations of Computer science

作者： I. Dinur O. Reingold Miller Institute for basic research in science Computer Science department University of California Berkeley USA NEC Research Princeton NJ USA AT and T Research Laboratories Florham Park NJ USA Incumbent of the Walter and Elise Haas Career Development Chair Department of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot Israel Institute of Advanced Study in Science and Technology Princeton NJ USA

In this work, we look back into the proof of the PCP theorem, with the goal of finding new proofs that are "more combinatorial" and arguably simpler. For that, we introduce the notion of an assignment tester, which is a strengthening of the standard PCP verifier, in the following sense. Given a statement and an alleged proof for it, while the PCP verifier checks correctness of the statement, the assignment-tester checks correctness of the statement and the proof. This notion enables composition that is truly modular, i.e., one can compose two assignment-testers without any assumptions on how they are constructed. A related notion was independently introduced in (Ben-Sasson et. al. STOC 04). We provide a toolkit of (non-trivial) generic transformations on assignment testers. These transformations may be interesting in their own right, and allow us to present the following two main results: 1. The first is a new proof of the PCP theorem. This proof relies on a rather weak assignment tester given as a "black box". From this, we construct combinatorially the full PCP. An important component of this proof is a new combinatorial aggregation technique (i.e., a new transformation that allows the verifier to read fewer, though possibly longer, "pieces" of the proof). An implementation of the black-box tester can be obtained from the algebraic proof techniques that already appear in L. Babai et al., 1991 and U. Feige et al., 1991. Obtaining a combinatorial implementation of this tester would give a purely combinatorial proof for the PCP theorem, which we view as an interesting open problem. 2. Our second construction is a "standalone" combinatorial construction showing NP /spl sube/ PCP (S. Arora et al., 1998). This implies, for example, that approximating max-SAT is quasi-NP-hard. This construction relies on a transformation that makes an assignment tester "oblivious": so that the proof locations read are independent of the statement that is being proven. This eliminates, in

关键词： Testing Computer science Polynomials National electric code Career development Mathematics Heart Circuits

来源：评论

学校读者我要写书评

暂无评论

Control of photoelectron interference dynamics with two-color laser fields

引用

Physical Review research 2022年第1期4卷 013140-013140页

作者： Facheng Jin Weifeng Yang Xiwang Liu Hongdan Zhang Wenhui Dong Xiaohong Song Jing Chen Research Center for Advanced Optics and Photoelectronics Department of Physics College of Science Shantou University Shantou Guangdong 515063 China Faculty of Science Xi'an Aeronautical Institute Xi'an 710077 China Department of Physics School of Science Hainan University Haikou 570288 China Institute of Applied Physics and Computational Mathematics P.O. Box 8009 Beijing 100088 China HEDPS Center for Applied Physics and Technology Peking University Beijing 100084 China

We study the multiple interference structures in photoelectron momentum distributions (PMDs) of xenon atoms, whose dynamics can be manipulated effectively by a fundamental and weaker third-harmonic two-color laser fields, especially for an oblique interference pattern. It is found that this structure is only attributed to the contributions from the forward-scattered electrons as a Coulomb effect in strong-field physics. Further, the gross structure of the oblique interference arises from the forward-scattered electron ionized within a quarter-cycle of the fundamental field, and the fine structure is identified to originate from the intercycle interference of the trajectories. Moreover, we demonstrate that the multiple interference structure can be enhanced or suppressed by adjusting the relative phase of two colors. Our investigation shows that the two-color laser fields can be tailored with the purpose of manipulating specific dynamics process, which will be helpful to resolve ultrafast spatio-temporal information from the complex interference in strong-field ionization.

关键词： Atomic & molecular processes in external fields Multiphoton or tunneling ionization & excitation

来源：评论

学校读者我要写书评

暂无评论

Effect of anharmonicity on the thermal conductivity of amorphous silica

引用

Physical Review B 2022年第1期106卷 014305-014305页

作者： Xueyan Zhu Cheng Shao CAEP Software Center for High Performance Numerical Simulation Beijing 100088 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China Thermal Science Research Center Shandong Institute of Advanced Technology Jinan Shandong Province 250103 China Department of Mechanical Engineering The University of Tokyo 7-3-1 Hongo Bunkyo Tokyo 113-8656 Japan

Proper consideration of anharmonicity is important for the calculation of thermal conductivity. However, how the anharmonicity influences the thermal conduction in amorphous materials is still an open question. In this work, we uncover the role of anharmonicity on the thermal conductivity of amorphous silica (a−SiO2) by comparing the thermal conductivity predicted from the harmonic theory and the anharmonic theory. Moreover, we explore the effect of anharmonicity-induced frequency shift on the prediction of thermal conductivity. It is found that the thermal conductivity calculated by the recently developed anharmonic theory (quasi-harmonic Green-Kubo approximation) is higher than that calculated by the harmonic theory developed by Allen and Feldman. The use of anharmonic vibrational frequencies also leads to a higher thermal conductivity compared with that calculated using harmonic vibrational frequencies. The anharmonicity-induced frequency shift is a mechanism for the positive temperature dependence of the thermal conductivity of a−SiO2 at higher temperatures. Further investigation on the mode diffusivity suggests that although anharmonicity has a larger influence on locons than diffusons, the increase in thermal conductivity due to anharmonicity is mainly contributed by the anharmonicity-induced increase of the diffusivity of diffusons. Finally, it is found that the cross-correlations between diffusons and diffusons contribute most to the thermal conductivity of a−SiO2, and the locons contribute to the thermal conductivity mainly through collaboration with diffusons. These results offer new insights into the nature of the thermal conduction in a−SiO2.

关键词： Anharmonic lattice dynamics Heat transfer Lattice thermal conductivity Phonons Transport phenomena Glasses Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Thiamine deficiency underlies persistent gut dysbiosis and inflammation in people living with HIV on antiretroviral therapy

引用

Translational Medicine Communications 2024年第1期9卷 1-12页

作者： Ishizaka, Aya Koga, Michiko Mizutani, Taketoshi Suzuki, Yutaka Matano, Tetsuro Yotsuyanagi, Hiroshi Division of Infectious Diseases Advanced Clinical Research Center the Institute of Medical Science The University of Tokyo Tokyo Japan Department of Computational Biology and Medical Sciences Graduate School of Frontier Sciences The University of Tokyo Chiba Japan AIDS Research Center National Institute of Infectious Diseases Tokyo Japan Department of AIDS Vaccine Development Institute of Medical Science the University of Tokyo Tokyo Japan Department of Infectious Diseases and Applied Immunology IMSUT Hospital of Institute of Medical Science the University of Tokyo Tokyo Japan

Antiretroviral therapy (ART) has significantly improved the prognosis for people living with human immunodeficiency virus (PLWH). However, alterations in the gut microbiota of PLWH affect their metabolic environment and may contribute to chronic inflammation and premature aging, despite effective ART. Given that inflammation in the body have been shown to be risk factors for age-related diseases, elucidating changes in the gut microbiota and metabolic levels over time in individuals would be for understanding the dynamics in the body that lead to disease development. The study assessed changes in blood markers, gut microbiota, and metabolic environment of PLWH on ART for four years, with participants divided into two groups based on median CD4 cell count (580/µL). The high-CD4 group was more obese than the low-CD4 group, but there was no significant difference in comorbidities, such as diabetes, hypertension, and dyslipidemia. An investigation of the alterations in gut microbiota over a 4-year period revealed a reduction in specific groups of bacteria that produce short-chain fatty acids (SCFAs) and an increase in the occurrence of Enterobacteriaceae. In addition, a decline in bacterial thiamine synthesis was predicted, and a decreased abundance of the Ruminococcus gauvreauii group, which relies on supplementation with thiamine from symbiotic bacteria, was observed. The abundance of Collinsella and Catenibacterium at baseline was positively correlated with the predicted number of thiamine-synthesizing pathway. The presence of Catenibacterium at follow-up was inversely correlated with the rate of increase in plasma levels of lipopolysaccharide-binding protein, an indicator of a leaky gut. In terms of assessing the diversity of gut microbiota, a trend towards an increase in opportunistic bacteria with different genetic distances was observed in the high-CD4 group at follow-up. These observations suggested that, despite effective ART, the thiamine-deficient environment

关键词：

来源：评论

学校读者我要写书评

暂无评论

Allosteric activation of AMPK ADaM's site by structural analogs of Epigallocatechin and Galegine: computational molecular modeling investigation

引用

In silico pharmacology 2025年第1期13卷 19页

作者： Mohnad Abdalla Abdeen Tunde Ogunlana Modinat Wuraola Akinboade Ridwan Olajire Muraina Oyindamola Anthonia Adeosun Onyekachi Juliet Okpasuo Olamide Tosin Olaoba Abdulaziz Alouffi Aqel Albutti Zeyad Kurdee Nouf Omar AlAfaleq Ajibola Hannah Fatoberu Temitope Isaac Adelus Pediatric Research Institute Children's Hospital Affiliated to Shandong University Jinan 250022 Shandong China. Institute for Advanced Medical Research and Training College of Medicine University of Ibadan Ibadan Oyo State Nigeria. Computational Biology and Drug Discovery Laboratory Department of Biochemistry Faculty of Basic Medical Sciences Ladoke Akintola University of Technology Ogbomoso Oyo State Nigeria. Department of Molecular Microbiology and Immunology School of Medicine University of Missouri Columbia MO 65212 USA. Department of Surgery School of Medicine University of Missouri Columbia MO 65212 USA. NextGen Precision Health Institute University of Missouri Columbia MO 65212 USA. King Abdulaziz City for Science and Technology Riyadh 12354 Saudi Arabia. Department of Medical Biotechnology College of Applied Medical Sciences Qassim University Buraydah Saudi Arabia. Clinical Biochemistry Unit Department of Pathology College of Medicine King Saud University Riyadh 11461 Saudi Arabia. Department of Biochemistry College of Science King Saud University Riyadh Saudi Arabia. Cambridge University Hospital Cambridge UK.

5’-Adenosine Monophosphate Protein Kinase (AMPK) is a central protein involved in cellular energy homeostasis, turning on catabolic pathways when the energy level is depleted and inhibiting anabolic pathways utilizing ATP. AMPK is implicated in several diseases including but not limited to diabetes, cancer, and cardiovascular diseases. Regulation of AMPK is cogent for restoring cellular energy levels which mediates the pathways leading to these diseases. Allosteric activation of AMPK via a novel ADaM site is intended for study in this case. In the search for AMPK activators, this study engaged a database for a virtual screening campaign through the ZINC15 database involving pharmacophoric modeling of two reported natural bioactive AMPK activators- Galegine and Epigallocatechin. Generated pharmacophores were targeted against the AMPK-ADaM site by employing various tools within the structure-based drug discovery process among which include consensus molecular docking, physicochemical profiling, ADMET, and molecular dynamics simulation. advanced methods such as molecular mechanics (MM/GBSA) and quantitative structure-activity relationship (QSAR) were also performed. This investigation revealed promising pharmacophores that show better interactions and pharmacokinetic properties compared to the standards. This study proposes further development of these pharmacophores into potential drugs with better efficacies that could enhance the activation of the AMPK-ADaM site in ameliorating the aforementioned diseases.

关键词： AMPK-ADaM site And MM/GBSA Molecular dynamics simulation Molecular modeling Pharmacophoric analogs Virtual screening

来源：评论

学校读者我要写书评

暂无评论

Observation of momentum-dependent charge excitations in hole-doped cuprates using resonant inelastic x-ray scattering at the oxygen K edge

引用

Physical Review B 2017年第11期96卷 115148-115148页

作者： Kenji Ishii Takami Tohyama Shun Asano Kentaro Sato Masaki Fujita Shuichi Wakimoto Kenji Tustsui Shigetoshi Sota Jun Miyawaki Hideharu Niwa Yoshihisa Harada Jonathan Pelliciari Yaobo Huang Thorsten Schmitt Yoshiya Yamamoto Jun'ichiro Mizuki Synchrotron Radiation Research Center National Institutes for Quantum and Radiological Science and Technology Hyogo 679-5148 Japan Department of Applied Physics Tokyo University of Science Tokyo 125-8585 Japan Institute for Materials Research Tohoku University Sendai 980-8577 Japan Materials Sciences Research Center Japan Atomic Energy Agency Ibaraki 319-1195 Japan Computational Materials Science Research Team RIKEN Advanced Institute for Computational Science (AICS) Kobe Hyogo 650-0047 Japan Institute for Solid State Physics University of Tokyo Chiba 277-8581 Japan Research Department Synchrotron Radiation and Nanotechnology Paul Scherrer Institut CH-5232 Villigen PSI Switzerland Graduate School of Science and Technology Kwansei Gakuin University Hyogo 669-1337 Japan

We investigate electronic excitations in La2−x(Br,Sr)xCuO4 using resonant inelastic x-ray scattering (RIXS) at the oxygen K edge. RIXS spectra of the hole-doped cuprates show clear momentum dependence below 1 eV. The broad spectral weight exhibits positive dispersion and shifts to higher energy with increasing hole concentration. Theoretical calculation of the dynamical charge structure factor on oxygen orbitals in a three-band Hubbard model is consistent with the experimental observation of the momentum and doping dependence, and therefore the momentum-dependent spectral weight is ascribed to intraband charge excitations which have been observed in electron-doped cuprates. Our results confirm that the momentum-dependent charge excitations exist on the order of the transfer energy (t), and the broad spectral line shape indicates damped and incoherent character of the charge excitations at the energy range in the doped Mott insulators.

关键词： Electronic structure Impurities in superconductors Stripes Cuprates High-temperature superconductors Density matrix renormalization group Resonant inelastic x-ray scattering

来源：评论

学校读者我要写书评

暂无评论

Describing the Migdal effect with a bremsstrahlung-like process and many-body effects

引用

Physical Review D 2021年第5期104卷 056009-056009页

作者： Zheng-Liang Liang Chongjie Mo Fawei Zheng Ping Zhang College of Mathematics and Physics Beijing University of Chemical Technology Beijing 100029 China Beijing Computational Science Research Center Beijing 100193 China Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(MOE) School of Physics Beijing Institute of Technology Beijing 100081 China School of Physics and Physical Engineering Qufu Normal University Qufu 273165 China Institute of Applied Physics and Computational Mathematics Beijing 100088 China

Recent theoretical studies have suggested that the suddenly recoiled atom struck by dark matter (DM) particle is much more likely to excite or lose its electrons than expected. Such Migdal effect opens a new avenue for exploring the sub-GeV DM particles. There have been various attempts to describe the Migdal effect in liquid and semiconductor targets. In this paper we incorporate the treatment of the bremsstrahlung process and the electronic many-body effects to give a full description of the Migdal effect in bulk semiconductor targets diamond and silicon. Compared with the results obtained with the atom-centered localized Wannier functions (WFs) under the framework of the tight-binding (TB) approximation, the method proposed in this study yields much larger event rates in the low energy regime, due to a ω−4 scaling. We also find that the effect of the bremsstrahlung photon mediating the Coulomb interaction between recoiled ion and the electron-hole pair is equivalent to that of the exchange of a single phonon.

关键词： Particle dark matter Dark matter detectors Density functional calculations

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：