In recent years there has been an exponential growth in the number of publications related to theory and applications of Data Envelopment Analysis (DEA). Charnes, Cooper, and Rhodes (1978) introduced ...DEA as a tool for measuring efficiency and productivity of decision making units. DEA has immediately been recognized as a modern tool for performance measurement. Since then, a large and considerable amount of articles has been appeared, including significant breakthroughs in theory and a great portion of works on DEA applications, both public and private sectors, to assess the efficiency and productivity of their activities. Although there have been several bibliographic collections reported, a comprehensive analysis and listing of DEA-related articles covering its first four decades of history is still missing. This paper, thus, aims to report an extensive listing of DEA-related articles including theory and methodology developments and "real" applications in diversified scenarios from 1978 to end of 2016. Some summary statistics of the publications' growth, the most utilized academic journals, authorship analysis, as well as keywords analysis are also provided.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
This paper studies the effect of export expansion on the US labour market over the last two decades. Exploiting foreign emerging markets’ unilateral liberalisation, this paper provides new empirical ...evidence for the importance of export expansion to the US labour market at the industry level. Using a novel instrumental variable strategy, the result confirms that US exports played a critical role in supporting manufacturing employment. Reduced‐form estimates imply that US exports to different markets created more than 1.6 million manufacturing jobs between 1991 and 2007, which is comparable to the estimated job losses attributed to the import competition from China. Meanwhile, there is substantial heterogeneity in this positive employment effect across export destinations and industries. Industries not only respond differently to various export shocks, but could also experience differential employment growth facing the same export shock. I find that the job creation effect is larger for industries with a higher initial share of workers who are older, less‐educated or non‐white, and performing routine‐based tasks. In addition, the effect is more pronounced for industries that had higher labour market concentration.
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FZAB, GIS, IJS, IZUM, KILJ, NLZOH, NUK, ODKLJ, OILJ, PILJ, SAZU, SBCE, SBMB, UL, UM, UPUK
The huge land areas in China provide highly diverse habitats for macrofungi. Of these macrofungi, many are directly related to people’s daily life and have been utilized by ancient Chinese for at ...least 6800 years. In this study, we evaluate the current known resource diversity of Chinese macrofungi. A total of 1662 taxa are summarized, and all species names and their authorities have been checked and corrected according to authentic mycological databases. Among the 1662 taxa, 1020, 692, and 480 are considered to be edible, medicinal and poisonous mushrooms, respectively. A few of edible macrofungi in China are commonly used for commercial production. All known medicinal functions are labeled for medicinal species. The most common medicinal functions possessed by Chinese macrofungi are antitumor or anticancer, followed by antioxidant and antimicrobial. A total of 277 Chinese macrofungi are edible simultaneously with certain medicinal functions and without known toxicity. These species could be treated as “Gold Mushrooms”. Contrarily, 193 edible and/or medicinal species are also recognized as poisonous mushrooms. To avoid poisoning caused by these species, ingestion either in a proper way or in small amounts is important. However, the mycotoxins metabolized by these poisonous species could be a huge wealth of natural products yet to be explored. How to utilize these Chinese macrofungal resources is a critical to benefit humans worldwide.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
The emergence of flash drought has attracted widespread attention due to its rapid onset. However, little is known about the recent evolution of flash droughts in terms of the speed of onset and the ...causes of such a rapid onset phase of flash droughts. Here, we present a comprehensive assessment of the onset development of flash droughts and the underlying mechanisms on a global scale. We find that 33.64-46.18% of flash droughts with 5-day onset of drying, and there is a significant increasing trend in the proportion of flash droughts with the 1-pentad onset time globally during the period 2000-2020. Flash droughts do not appear to be occurring more frequently in most global regions, just coming on faster. In addition, atmospheric aridity is likely to create a flash drought-prone environment, and the joint influence of soil moisture depletion and atmospheric aridity further accelerates the rapid onset of flash droughts.
Organic electrochemistry has a rich history in organic synthesis and has been considered as a promising alternative to traditional chemical oxidants and reductants because it obviates the use of ...stoichiometric amount of dangerous and toxic reagents. In particular, the electrochemical C—H bonds functionalization is one of the most desirable approaches for the construction of carbon–carbon (C—C) and carbon–heteroatom (C—X) bonds. This review summarizes the substantial progress made in the last few years in C—H functionalization via organic electrochemistry. It is divided into sections on C—C, C—N, C—O, C—S, C–Halogen and C—P bond formation.
Organic electrochemistry has a rich history in organic synthesis and has been considered as a promising alternative to traditional chemical oxidants and reductants because it obviates the use of stoichiometric amount of dangerous and toxic reagents. In particular, the electrochemical C—H bonds functionalization is one of the most desirable approaches for the construction of carbon–carbon (C—C) and carbon–heteroatom (C—X) bonds.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
Conspectus Electrochemical synthesis of organic compounds has emerged as an attractive and environmentally benign alternative to conventional approaches for oxidation and reduction of organic ...compounds that utilizes electric current instead of chemical oxidants and reductants. As such, many useful transformations have been developed, including the Kolbe reaction, the Simons fluorination process, the Monsanto adiponitrile process, and the Shono oxidation, to name a few. Electrochemical C–H functionalization represents one of the most promising reaction types among many electrochemical transformations, since this process avoids prefunctionalization of substrates and provides novel retrosynthetic disconnections. However, site-selective anodic oxidation of C–H bonds is still a fundamental challenge due to the high oxidation potentials of C–H bonds compared to organic solvents and common functional groups. To overcome this issue, indirect electrolysis via the action of a mediator (a redox catalyst) is regularly employed, by which the selectivity can be controlled following reaction of said mediator with the substrate. Since the redox potentials of transition metal complexes can be easily tuned by modification of the ligand, the synergistic use of electrochemistry and transition metal catalysis to achieve site-selective C–H functionalization is an attractive strategy. In this Account, we summarize and contextualize our recent efforts toward transition metal-catalyzed electrochemical C–H functionalization proximal to a suitable directing group. We have developed C–H oxygenation, acylation, alkylation, and halogenation reactions in which a Pd(II) species is oxidized to a Pd(III) or Pd(IV) intermediate by anodic oxidation, followed by reductive elimination to form the corresponding C–O, C–C, and C–X bonds. Importantly, improved monofunctionalization selectivity is achieved in the Pd-catalyzed C(sp3)–H oxygenation compared to conventional approaches using PhI(OAc)2 as the chemical oxidant. Physical separators are sometimes used to prevent the electrochemical deposition of Pd black on the cathode resulting from reduction of high valent Pd species. We skirted this issue through the development a Cu-catalyzed electrochemical C(sp2)–H amination using n-Bu4NI as a redox cocatalyst in an undivided cell. In addition, we developed Ir-catalyzed electrochemical vinylic C–H functionalization of acrylic acids with alkynes in an undivided cell, affording various substituted α-pyrones in good to excellent yield. More importantly, chemical oxidants, including Ag2CO3, Cu(OAc)2, and PhI(OAc)2, resulted in much lower yields in the absence of electrical current under otherwise identical conditions. As elaborated below, progress in the area of electrochemical transition metal-catalyzed synthesis provides an effective platform for environmentally friendly and sustainable selective chemical transformations.
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IJS, KILJ, NUK, PNG, UL, UM
Polyporaceae is one of the most important families of Basidiomycota. Investigations on the species diversity, taxonomy and phylogeny of Polyporaceae in China are carried out. So far 217 species ...belonging to 42 genera are reported from China. Two new genera:
Amylosporia
gen. nov. and
Murinicarpus
gen. nov., twelve new species:
Coriolopsis dendriformis
sp. nov.,
C. hainanensis
sp. nov.,
Funalia cystidiata
sp. nov.,
Haploporus microsporus
sp. nov.,
Perenniporia citrinoalba
sp. nov.,
P. yinggelingensis
sp. nov.,
Picipes hainanensis
sp. nov.,
P. jiajinensis
sp. nov.,
P. pseudovarius
sp. nov.,
Trametes duplexa
sp. nov.,
T. ellipsoidea
sp. nov. and
T. stiptica
sp. nov., and six new combinations,
Amylosporia hattorii
comb. nov.,
Hornodermoporus latissimus
comb. nov.,
Murinicarpus subadustus
comb. nov.,
Picipes pumilus
comb. nov.,
Vanderbylia delavayi
comb. nov. and
Vanderbylia robiniophila
comb. nov., are proposed. All the species are described based on the Chinese collections. Keys to genera of Polyporaceae occurring in China and keys to species of each genus are provided. This monograph provides a revised classification of Polyporaceae in China according to the modern taxonomy. The phylogeny of Polyporaceae from China are reconstructed based on DNA sequences of multiple loci including the internal transcribed spacer (ITS) regions, the large subunit nuclear ribosomal RNA gene (nLSU), the small subunit nuclear ribosomal RNA gene (nSSU), the small subunit mitochondrial rRNA gene sequences (mtSSU), the translation elongation factor 1-α gene (TEF1), the β-tubulin gene (TBB1), the RNA polymerase II largest subunit (RPB1) and second largest subunit (RPB2) genes. In addition, full morphological descriptions, illustrations, color photographs, taxonomic notes, ecology and all the available sequences of Polyporaceae species found from China are provided.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OBVAL, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
This paper is focused on code-domain non-orthogonal multiple access (CD-NOMA), which is an emerging paradigm to support massive connectivity for future machine-type wireless networks. We take a ...comparative approach to study two types of overloaded CD-NOMA, i.e., sparse code multiple access (SCMA) and dense code multiple access (DCMA), which are distinctive from each other in terms of their codebooks having sparsity or not. By analysing their individual diversity orders (DO) in Rayleigh fading channels, it is found that DCMA can be designed with the aid of generalized sphere decoder (i.e., a nonlinear multiuser detector) to enjoy full DO which is equal to the maximum number of resource nodes in the system. This is in contrast to SCMA whose error rate suffers from limited DO equal to the codebook sparsity (i.e., the effective number of resource nodes occupied by each user). We conduct theoretical analysis for the codebook design criteria and propose to use generalized sphere decoder for DCMA detection. We numerically evaluate two types of multiple access schemes under "<inline-formula> <tex-math notation="LaTeX">4\times 6 </tex-math></inline-formula>" (i.e., six users communicate over four subcarriers) and "<inline-formula> <tex-math notation="LaTeX">5\times 10 </tex-math></inline-formula>" NOMA settings and reveal that DCMA gives rise to significantly improved error rate performance in Rayleigh fading channels, whilst having decoding complexity comparable to that of SCMA.
Abstract The rising incidence of bone disorders has resulted in the need for more effective therapies to meet this demand, exacerbated by an increasing ageing population. Bone tissue engineering is ...seen as a means of developing alternatives to conventional bone grafts for repairing or reconstructing bone defects by combining biomaterials, cells and signalling factors. However, skeletal tissue engineering has not yet achieved full translation into clinical practice as a consequence of several challenges. The use of additive manufacturing techniques for bone biofabrication is seen as a potential solution, with its inherent capability for reproducibility, accuracy and customisation of scaffolds as well as cell and signalling factor delivery. This review highlights the current research in bone biofabrication, the necessary factors for successful bone biofabrication, in addition to the current limitations affecting biofabrication, some of which are a consequence of the limitations of the additive manufacturing technology itself.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK, ZRSKP
The scarcity of reliable methods for synthesizing chiral gem‐diarylmethine borons limits their applications. Herein, we report a method for highly enantioselective dirhodium‐catalyzed B−H bond ...insertion reactions with diaryl diazomethanes as carbene precursors. These reactions afforded chiral gem‐diarylmethine borane compounds in high yield (up to 99 % yield), high activity (turnover numbers up to 14 300), high enantioselectivity (up to 99 % ee) and showed unprecedented broad functional group tolerance. The borane compounds synthesized by this method could be efficiently transformed into diaryl methanol, diaryl methyl amine, and triaryl methane derivatives with good stereospecificity. Mechanistic studies suggested that the borane adduct coordinated to the rhodium catalyst and thus interfered with decomposition of the diazomethane, and that insertion of a rhodium carbene (generated from the diaryl diazomethane) into the B−H bond was most likely the rate‐determining step.
We report highly enantioselective dirhodium‐catalyzed B−H bond insertion reactions with diaryl diazomethanes as carbene precursors. These reactions afforded chiral gem‐diarylmethine borane compounds in high yield (up to 99 % yield), high activity (turnover numbers up to 14 300), high enantioselectivity (up to 99 % ee) and showed unprecedented broad functional group tolerance.
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BFBNIB, FZAB, GIS, IJS, KILJ, NLZOH, NUK, OILJ, SBCE, SBMB, UL, UM, UPUK
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