Results 61 to 70 of about 2,245 (216)

On circulant chromatic number and circulant chromatic function

Discrete Mathematics, 2001
The circulant chromatic number (= star chromatic number, see \textit{A. Vince} [J. Graph Theory 12, No. 4, 551-559 (1988; Zbl 0658.05028)]) is accompanied with the new concept of a circulant chromatic function. Apart from basic facts and examples about this function the paper mainly investigates (in part with the help of this function) the relationship
Zhixiong Wang, Huishan Zhou
openaire   +3 more sources

Impact of Nitrate on the Removal of Pollutants from Water in Reducing Gas-Based Membrane Biofilm Reactors: A Review

Membranes
The membrane biofilm reactor (MBfR) is a novel wastewater treatment technology, garnering attention due to its high gas utilization rate and effective pollutant removal capability.
Zhiheng Zhang, Zhian Huang, Haixiang Li, Dunqiu Wang, Yi Yao, Kun Dong   +5 more
doaj   +1 more source

Bio‐Derived Carbon Nanoparticles: A Green Amendment for Alleviating Heavy Metals in Soil–Plant Systems

Land Degradation &Development, EarlyView.
ABSTRACT Heavy metal (HM) contamination of soil–plant systems poses persistent ecological and health risks, driving interest in nanoparticle‐based remediation. Although conventional chemically synthesized nanoparticles (CSNPs) are effective, their energy‐intensive production and residual toxicity limit sustainable deployment.
Babar Hussain, Muhammad Nauman, Zahid Hussain, Palanisamy Vasudhevan, Abdulaziz G. Alghamdi, Shiyong Sun, Shengyan Pu   +6 more
wiley   +1 more source

Features of Synthesis, Crystal Structure, Thermal and Electrical Properties, XPS/NEXAFS Study of Pyrochlore-Type Bi₂Cr_0.5Co_0.5Nb₂O_9+Δ

Chemistry
The phase-pure cubic pyrochlore of the Bi2Cr0.5Co0.5Nb2O9+Δ composition can be successfully synthesized by a modified sol–gel method (Pecini method-PM) and a traditional solid-phase method (SPM).
Nadezhda A. Zhuk, Nikolay A. Sekushin, Maria G. Krzhizhanovskaya, Vladislav V. Kharton, Danil V. Sivkov, Sergey V. Nekipelov   +5 more
doaj   +1 more source

The Rise of Layered Double Hydroxides (LDHs) in Hexavalent Chromium (Cr(VI)) Pollution Treatment: Performance, Optimization, and Challenges

Safety Science and Technology, EarlyView.
This article focus on the basic properties, adsorption processes, performance improvement strategies, and the facing challenges of LDHs. ABSTRACT Layered double hydroxides (LDHs), a class of inorganic materials with unique layered structures, exhibit significant potential in environmental remediation.
Wenqi Fan, Shuai Tian, Jiwen Lai, Zhiwu Min, Qingyang Qiu, Xian Li, Zuwen Liu   +6 more
wiley   +1 more source

The significance of chromate ingestion in patients allergic to chromate

Acta Dermato-Venereologica, 1977
A double-blind study was carried out to demonstrate the significance of chromate ingestion in the persistence of chromic chromate dermatitis. Each of 31 chromate-allergic patients was given one tablet containing 7.1 mg potassium dichromate, plus a placebo tablet.
K, Kaaber, N K, Veien
openaire   +2 more sources

Low-temperature preparation and characterization of phase-pure lanthanide chromates (V) by the citrate gel process

, 1993
Phase-pure, crystalline lanthanide chromates LnCrO4 (V), where Ln = La, Pr, Nd, Sm, Gd, Dy, Ho, Yb, Lu and Y, have been prepared by the controlled combustion of the corresponding lanthanide biscitrato chromium (III) complexes at comparatively low ...
Devi, Sujatha P, Rao, Subba M
core   +1 more source

Role of Mitochondrial Electron Transport Chain Dysfunction in Cr(VI)-Induced Cytotoxicity in L-02 Hepatocytes

Cellular Physiology and Biochemistry, 2014
Background: Hexavalent chromium [Cr(VI)] and its compounds (e.g. chromates), which are extensively used in numerous industrial processes including leather tanning and steel manufacturing, are considered as priority pollutants.
Fang Xiao, Yanhong Li, Lei Luo, Ying Xie, Ming Zeng, An Wang, Hanchun Chen, Caigao Zhong   +7 more
doaj   +1 more source

Integration of Micro‐CT and XRF Mapping for Multimodal 3D Analysis of Polychrome Wooden Artifacts

X-Ray Spectrometry, EarlyView.
ABSTRACT Over the past 5 years, computer applications have become crucial to archeological research. Since the 1990s, the focus has transitioned from data management tools to the development of virtual models. Recently, digital documentation of cultural heritage has gained considerable focus, with 3D modeling of objects.
Josiane E. Cavalcante, Olga Araujo, Alessandra Machado, Roberta M. P. S. Borges, Isis V. N. S. Franzi, Anderson G. de Paula, Roberta Leitão, Marcelino dos Anjos, Renato Freitas, Ricardo T. Lopes, Davi F. Oliveira   +10 more
wiley   +1 more source

Chromatics: Warm and Cool

Art & Perception
Abstract Artistically, an important bipartition of hues is with respect to their warm–cool quality. What might this correspond to in colorimetric terms? Various interpretations have been suggested, mostly informally. We attempt to compare them quantitatively, using either diverse data available from the literature, or formal means.
Jan J. Koenderink, Andrea J. van Doorn, Doris I. Braun   +2 more
openaire   +1 more source