Recovery technology of spent hydrogenation catalysts -A review.

Spent hydrogenation catalysts (HDCs) contain many Mo, V, Co, Ni, and AlO carriers, which are valuable secondary resources. However, improper disposal can also lead to environmental pollution risks. In the past decade, research reviews on the recovery of valuable metals from spent HDCs have been somewhat reported, mainly summarizing basic technical processes.

Strategy and Technical Progress of Recycling of Spent Vanadium-Titanium-Based Selective Catalytic Reduction Catalysts.

Selective catalytic reduction denitration technology, abbreviated as SCR, is essential for the removal of nitrogen oxide from the flue gas of coal-fired power stations and has been widely used. Due to the strong demand for energy and the requirements for environmental protection, a large amount of SCR catalyst waste is produced. The spent SCR catalyst contains high-grade valuable metals, and proper disposal or treatment of the SCR catalyst can protect the environment and realize resource recycling.

Impact of the climatic changes in the Pliocene-Pleistocene transition on Irano-Turanian species. The radiation of genus Jurinea (Compositae).

The Irano-Turanian region is one of the world's richest floristic regions and the centre of diversity for numerous xerophytic plant lineages. However, we still have limited knowledge on the timing of evolution and biogeographic history of its flora, and potential drivers of diversification remain underexplored. To fill this knowledge gap, we focus on the Eurasian genus Jurinea (ca.

Interface Effects on Magnetic Flux Pinning in LaSrMnO/YBa CuO Bilayers.

The magnetic pinning properties of a ferromagnet/superconductor hybrid structure consisting of a LaSrMnO(LSMO) layer with various thicknesses on top of a fixed thickness YBaCuO (YBCO) layer are investigated in this article. The existence of a weakly magnetic layer was identified at the interface between YBCO and LSMO by a ferromagnetic resonance (FMR) study. Magnetic moment and anisotropy of the interfacial layer were probed using the angular-dependent FMR study.

Advanced genome-editing technologies enable rapid and large-scale generation of genetic variants for strain engineering and synthetic biology.

Targeted genome editing not only improves our understanding of fundamental rules in life sciences but also affords us versatile toolkits to improve industrially relevant phenotypes in various host cells. In this review, we summarize the recent endeavor to develop efficient genome-editing tools, and emphasize the utility of these tools to generate massive scale of genetic variants. We categorize these tools into traditional recombination-based tools, and more advanced CRISPR as well as RNA-based genome-editing tools.

Correlation of grain orientations and the thickness of gradient MoS films.

In this study, we synthesized gradient MoS films with a home-made suspended mask and characterized them by transmission electron microscopy (TEM) and Raman spectroscopy. The advantage of using gradient films is to simultaneously produce numerous samples under the same growth condition but with different thicknesses. The cross-sectional TEM images and their Fourier transform spectra revealed the thickness dependency of the grain orientations for synthetic MoS films.

Phylogeny, origin, and dispersal of Dubyaea (Asteraceae) based on Hyb-Seq data.

Dubyaea DC. is a small genus of Asteraceae that is almost exclusively endemic to the Pan-Himalayan region. Within Dubyaea, phylogenetic relationships remain poorly understood.

Respiratory tract infections in children with allergic asthma on allergen immunotherapy during influenza season.

To describle how respiratory tract infections (RTIs) that occurred in children with allergic asthma (AA) on allergen immunotherapy (AIT) during an influenza season. Data including clinical symptoms and treatment history of children (those with AA on AIT and their siblings under 14 years old), who suffered from RTIs during an influenza season (Dec 1st, 2019-Dec 31st, 2019), were collected (by face to face interview and medical records) and analyzed. Children on AIT were divided into 2 groups: stage 1 (dose increasing stage) and stage 2 (dose maintenance stage).

Phylogeny, origin and dispersal of Saussurea (Asteraceae) based on chloroplast genome data.

Saussurea is one of the largest genera of the tribe Cardueae of Asteraceae, comprising about 460 species from the Northern Hemisphere with most species distributed in QTPss and adjacent areas. Here, we established a well-supported phylogenetic framework for Saussurea based on whole chloroplast genomes of 136 taxa plus 16 additional taxa of Cardueae using Bayesian inference and Maximum Likelihood. Our phylogenetic results are inconsistent with previous subgeneric classifications of Saussurea.

[Research progress of microphone array based front-end speech enhancement technology for cochlear implant].

Microphone array based methods are gradually applied in the front-end speech enhancement and speech recognition improvement for cochlear implant in recent years. By placing several microphones in different locations in space, this method can collect multi-channel signals containing a lot of spatial position and orientation information. Microphone array can also yield specific beamforming mode to enhance desired signal and suppress ambient noise, which is particularly suitable to be applied in face-to-face conversation for cochlear implant users.

[Research of front-end speech enhancement and beamforming algorithm based on dual microphoneforcochlear implant].

Speech enhancement methods based on microphone array adopt many microphones to record speech signal simultaneously. As spatial information is increased, these methods can increase speech recognition for cochlear implant in noisy environment. Due to the size limitation, the number of microphones used in the cochlear implant cannot be too large, which limits the design of microphone array beamforming.

[Research on spectrum feature of speech processing strategy for cochlear implant].

Cochlear implant (CI) in present Chinese environment will lose pitch information and result in low speech recognition. In order to research Chinese feature-based speech processing strategy for cochlear implant contrapuntally and to improve the speech recognition for CI recipients, we improve the CI front-end signal acquisition platform and research the signal features. Our search includes the waveform, spectrogram, energy intensity, pitch and formant parameters for different speech processing strategies of cochlear implant.

On merging sections and : Molecular and morphological evidence.

In this study, we expanded Acer sect. Rubra Pax to include A. sect.

Broadband beamforming compensation algorithm in CI front-end acquisition.

Background: To increase the signal to noise ratio (SNR) and to suppress directional noise in front-end signal acquisition, microphone array technologies are being applied in the cochlear implant (CI). Due to size constraints, the dual microphone-based system is most suitable for actual application. However, direct application of the array technology will result in the low frequency roll-off problem, which can noticeably distort the desired signal.

Real-time spectrum estimation-based dual-channel speech-enhancement algorithm for cochlear implant.

Background: Improvement of the cochlear implant (CI) front-end signal acquisition is needed to increase speech recognition in noisy environments. To suppress the directional noise, we introduce a speech-enhancement algorithm based on microphone array beamforming and spectral estimation. The experimental results indicate that this method is robust to directional mobile noise and strongly enhances the desired speech, thereby improving the performance of CI devices in a noisy environment.

[Studies on the lowering blood sugar substances from agrimony].

Objective: To isolate and identify the chemical constituents from the active section lowering blood sugar of agrimony.

Methods: The compounds were separated by repeated silica gel, Sephadex LH-20 and HPLC chromatographies. The structures of compounds isolated were identified by analysis of their spectral data and chemical properties.

2-Amino-6-nitro-1H-benzoimidazol-3-ium chloride.

In the cation of the title compound, C(7)H(7)N(4)O(2) (+)·Cl(-), the benzimidazole ring system is planar with a maximum deviation of -0.019 (3) Å. In the crystal structure, C-H⋯Cl, N-H⋯Cl, and N-H⋯Cl inter-actions link the mol-ecules into a two-dimensional network.

(2-Methyl-3-nitro-phen-yl)methanol.

The asymmetric unit of the title compound, C(8)H(9)NO(3), contains two crystallographically independent mol-ecules, whose aromatic rings are oriented at a dihedral angle of 83.29 (3)°. In the crystal structure, inter-molecular O-H⋯O hydrogen bonds link the mol-ecules into chains.

2-Methyl-3-nitro-benzyl cyanide.

The title compound, C(9)H(8)N(2)O, was prepared from o-xylene by nitration, oxidation, hydrolysis, reduction, chlorination and cyanation. There are two mol-ecules in the asymmetric unit with a dihedral angle of 20.15 (7)° between their aromatic rings.

Novel oxazabicycles as a new class of photochromic colorants.

A new photochromic colorant with an oxazabicyclic moiety has been synthesized by an efficient method. It turns pale red upon UV irradiation and undergoes reverse reaction while being heated. This work may open an exciting new avenue for future development of the photochromic dyes with novel molecular structures.

Five novel prenylated xanthones from Resina Garciniae.

Fourteen prenylated xanthone derivatives were isolated from gamboge, the dry latex of Garcinia hanburyi, and their structures were elucidated by a detailed spectroscopic analysis. Five of them, isogambogenic acid (1), desoxymorellinin (2), 10-methoxygambogenic acid (3), 10-methoxygambogic acid (4) and 10-ethoxy gambogic acid (5), are new compounds. All of them showed potent cytotoxicity against HL-60, SMMC-7721 and BGC-83 cells.

4-Bromo-2,6-dimethyl-anilinium bromide monohydrate.

In the title compound, C(8)H(11)BrN(+)·Br(-)·H(2)O, a network of N-H⋯O, N-H⋯Br and O-H⋯Br hydrogen bonds helps to consolidate the crystal packing.

Enzyme inhibition potency enhancement by active site metal chelating and hydrogen bonding induced conformation-restricted cyclopropanecarbonyl derivatives.

Two cyclopropanecarbonyl derivatives were independently found to be 15 and 14 times more potent than the corresponding isopropylcarbonyl analogues as inhibitors of 4-hydroxyphenylpyruvate dioxygenase and dihydroorotate dehydrogenase, respectively. A thorough examination of the co-crystal structures of available enzyme inhibitor complexes and the conformation of X-ray crystal structures of several synthesized cyclopropanecarbonyl derivatives revealed that this enhancement by one order of magnitude of inhibition potency exhibited by cyclopropanecarbonyl derivatives in both enzymes is probably caused by respective metal chelating and hydrogen bonding interactions at the ligand-receptor binding site. These specific interactions subsequently cause the cyclopropyl group of the molecules to adopt a fixed bisected conformation, which is unavailable for isopropylcarbonyl derivatives.