Yu Lan

Yu Lan
Chinese Academy of Sciences | CAS · Space Optical Technology Research Department

About

275
Publications
22,125
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5,036
Citations
Citations since 2016
156 Research Items
4124 Citations
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
201620172018201920202021202202004006008001,000
Introduction
Skills and Expertise

Publications

Publications (275)
Article
As the most important source of commodity grain in China, Northeast China plays a crucial role in guaranteeing national food security. The application of biochar in agricultural ecosystems has shown immense potential in ensuring crop yields while mitigating N2O emissions. However, the long-term impacts and mechanisms of successive application of co...
Article
Full-text available
Soil microbial organisms are conducive to SOC sequestration. However, little attention has been given to the contributions of living MBC and microbial necromass carbon to the SOC pool under biochar and straw amendments. The aims of the study were to explore (1) the effects of maize straw and biochar on MBC, POC, MAOC, DOC and microbial necromass ca...
Article
Full-text available
The application of biochar in agricultural ecosystems is a viable strategy for mitigating climate change and ensuring food security. Northeast China is China’s main maize-growing region, as well as the country's greatest commodity grain base. However, due to a lack of long-term field investigations, information on the effects of biochar on soil CO2...
Article
The NiMnGa alloy is a typical magnetic shape memory alloy with up to 6% immense strain, high energy density, and low effective elastic modulus. These comprehensive characteristics make it possible to realize a low-frequency underwater acoustic transducer. To describe the field-induced dynamic strain, an equivalent circuit model (ECM) of a longitudi...
Article
Full-text available
Turning maize straw into biochar is useful for improving soil fertility and mitigating climate change. However, the difference between straw and straw-derived biochar on soil aggregate associated humic substances has not been sufficiently studied in brown earth soil. The objective of this study was to investigate how different straw management prac...
Article
Full-text available
Biochar-based fertilizers are used to improve soil’s physiochemical and biological properties and increase fertilizer utilization rate. Therefore, a technological model of biochar-based fertilizers is essential for the reduced application. This study was conducted to determine the effects of the different levels of biochar-based fertilizer applicat...
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Full-text available
Seasonal influenza A (H3N2) virus has been a concern since its first introduction in humans in 1968. Accumulating antigenic changes in viral hemagglutinin (HA), particularly recent cocirculations of multiple HA genetic clades, allow H3N2 virus evade into humans annually. From 2010, the binding of neuraminidase (NA) to sialic acid made the tradition...
Article
Full-text available
Sub-micron spherical α-Si3N4 powder has been synthesized by direct nitridation of silicon saw dust recovered from photovoltaic industry in nitrogen at 1300 °C with halogen salts as additives. XRD analysis indicates that the formation of α-Si3N4 is enhanced and accelerated, as compared to the direct nitridation without the additive. SEM examination...
Article
Most broadband Tonpilz transducers are achieved by coupling first-order longitudinal mode with other modes introduced by an elaborately designed structure (e.g., flexural mode of the head mass). To further expand the bandwidth is difficult and, even if successful, inevitably makes the structure more complex. Longitudinal modes are the inherent vibr...
Article
In this paper, the two-layer 1–3 composite transducer using an unconventional part-excitation method is presented to achieve the ultra-wide operation band for the high-frequency underwater devices, in which the part-excitation refers to the method that only the lower-layer is excited, while the upper-layer in contact with the propagation medium is...
Article
The use of biochar as soil amendment might improve the soil structure and carbon sequestration. However, few studies have focused on the effects of biochar doses on soil aggregates in brown earth. A six-year field experiment was conducted from May 2013 to October 2018. Four biochar doses were tested: 0, 15.75, 31.5, and 47.25 t ha⁻¹ (control, BC1,...
Article
Potential shortages in the reserves of phosphorus (P) rock and low soil P availability are among the main limiting factors for agricultural development. Recent studies show that biochar plays a crucial role in regulating soil physicochemical properties and crop development. To further verify the contribution of biochar to availability of soil P and...
Article
The influence of biochar on soil urea hydrolysis process is associated with its potential ability on soil nitrogen amelioration. The objective of this study was to investigate the effect of biochar on urea hydrolysis and identify the main factors that drive their consequent behavior. The short-term incubation experiment was conducted to quantify th...
Article
In this study, we assessed the effects of biochar application for five years on soil phosphorus (P) factions by chemical sequential P fractionation, phosphatase activity, and ³¹P NMR. Four treatments were included in this research: two biochar (0 and 2.63 t ha⁻¹) levels blended with two P fertilizer levels (0 and 26 kg P ha⁻¹), respectively. We fou...
Article
In the process of multiplexing acoustic orbital angular momentum to realize underwater acoustic communication, the demodulation process is always affected by the larger divergence angle of higher-order acoustic vortex beams. To restrain the influences of this problem, proposed here are discrete active helical arrays with different heights and radii...
Article
N2O emission from paddy soil is a potential environmental risk, especially when the soil moisture content of paddy soil changes and excessive nitrogen retention occurs. Biochar is known to have a positive effect on reducing N2O emissions. However, the influence of different types of biochar on N2O emission with varying soil moisture contents is unc...
Article
Single crystalline α-Si3N4 nanowhiskers were synthesized by direct nitridation of the NH3-pretreated silicon powders under N2/H2 atmosphere without adding any catalysts. The phase composition and microstructure of the as-obtained products were investigated. It is shown that the NH3 pretreatment has a great influence on the phase and microstructure...
Article
An abnormal urine composition is a key reason for kidney stone formation, but little is known about the roles of small metabolites in the urine during kidney stone formation. Here, we found urine glycine in patients with kidney calcium oxalate (CaOx) stone was significantly lower than that in healthy people via 1H NMR spectra detection, and investi...
Article
Full-text available
At present, high-speed underwater acoustic communication requires underwater transducers with the characteristics of low frequency and broadband. The low-frequency transducers also are expected to be low-frequency directional for realization of point-to-point communication. In order to achieve the above targets, this paper proposes a new type of fl...
Article
Full-text available
Return of crop straw and its biochar to the agricultural field decreases pressure on phosphorus (P) resources and reduces leaching and P runoff. We conducted a five‐year field trial from 2013 to 2017 to study the capability of maize straw and its biochar to retain soil P, which was quantified by investigating the distribution of P fractions in the...
Article
The mechanism and origin of selectivities of NHC-catalyzed arylation of azonaphthalenes with α-chloroaldehydes have been theoretically studied for the first time.
Article
Density functional theory (DFT) calculations have been performed to provide mechanistic insight into the Rh/Cu co-catalyzed multicomponent annulation of indoles, diazo compounds, and α,β-unsaturated esters. Indole can undergo electrophilic attack by a dirhodium–carbene complex to form a cyclopropane intermediate, which is transferred to an enolate...
Article
This study investigated the effect of corn straw biochar on the decomposition, nutrient transformation, and bacterial community characteristics in the corn straw decomposition process. A 90-day microcosm incubation experiment was performed to assess the effects of corn straw biochar (500 °C, 1 h) on the corn straw decomposition process and the resu...
Article
In the presence of multiple electrophiles, reaction sequence is a critical mechanistic problem. Here, we report a theoretical study on the mechanism of phosphine-catalyzed [8+2] cycloaddition of heptafulvenes and allenoate....
Article
Multicomponent catalytic processes that can generate multiple C(sp3)-C(sp3) bonds in a single step under mild conditions, particularly those that employ inexpensive catalysts and substrates, are highly sought-after in chemistry research for complex molecule synthesis. Here, we disclose an efficient Ni-catalyzed reductive protocol that chemoselectiv...
Article
The density functional theory (DFT) calculations were performed to gain insights into possible reaction mechanisms and origin of selectivities on phosphine catalyzed [2+3] and [2+4] annulations of saturated amine with allenoate for the first time. The computed results reveal that allenoate prefers to serve as a C3 synthon rather than C4 synthon und...
Article
Regulating the reactivity of nucleophiles is important in synthetic chemistry. As a weaker nucleophile is also a stronger Brønsted acid, it can be selectively deprotonated by a Brønsted base to give an anionic species that shows higher reactivity. Following this idea, the reactivity of nucleophiles can be controlled by using an appropriate Lewis ac...
Article
Silicon oxynitride nanopowders were successfully prepared by thermal explosion of the Si and SiO2 mixed powders with the different particle sizes in various molar ratio (x/y = 2.0, 1.5) under N2, supplemented by the subsequent gravity separation strategy. The effects of Si/SiO2 molar ratio, preheating temperature and insulation time on the phase co...
Article
In this study, a novel boehmite (AlOOH) nanowhiskers/polyethylene (PE) separator was initially prepared by the AlOOH nanowhiskers coating on the commercial PE separator using dip-coating method, in which the AlOOH nanowhiskers were directly synthetized by a facile hydrothermal method. It is shown that the needle-like AlOOH nanowhiskers with the rou...
Article
Full-text available
Higher-order cycloadditions are a powerful strategy for the construction of polycycles in one step. However, an efficient and concise version for the induction of asymmetry is lacking. N-heterocyclic carbenes are widely used organocatalysts for asymmetric synthesis and could be an ideal choice for enantioselective higher-order cycloadditions. Here,...
Article
Full-text available
Unlike the well-reported 1,2-difunctionalization of alkenes that is directed by classic pyridine and imine-containing directing groups, oxo-palladacycle intermediates featuring weak Pd-O coordination have been less demonstrated in C-H activated cascade transformations. Here we report a quadruple C-H activation cascade as well as hydro-functionaliza...
Article
The non‐noble metal‐catalyzed asymmetric hydrogenation of N‐heteroaromatics, quinolines, has been realized by using a well‐defined chiral pincer manganese catalyst, with up to 97 % ee and 3840 TON. Abstract The non‐noble metal‐catalyzed asymmetric hydrogenation of N‐heteroaromatics, quinolines, is reported. A new chiral pincer manganese catalyst s...
Article
The first example of non‐noble metal‐catalyzed asymmetric hydrogenation of N‐heteroaromatics is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of quinolines, affording high yields and enantioselectivities (up to 97% ee). A turnover number of 3840 was reached at a low catalyst l...
Preprint
div>Multicomponent catalytic processes that can generate multiple C(sp<sup>3</sup>)-C(sp<sup>3</sup>) bonds in a single step under mild conditions,particularly if the catalysts and substrates are inexpensive, are highly sought-after in chemistry research for complex molecule synthesis. Here, we disclose an efficient Ni-catalysed reductive protocol...
Preprint
p>The first example of non-noble metal-catalyzed asymmetric hydrogenation of aromatic N -heterocycles is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of a wide range of quinolines, affording high yields and excellent enantioselectivities (up to 97% ee ). A turnover number of...
Article
Full-text available
Phosphorus reuse by application of biochar is a recent concept that needs to be supported by long-term field data. To monitor biochar’s long-term effects on P turnover, one-off biochar was applied in 2013 with mineral NPK fertilizers being applied every year since then. Biochar application rates included 0 t ha−1 (CK), 15.75 t ha−1 (BC1), 31.5 t ha...
Article
An efficient iron‐catalyzed radical relay protocol enabled the rapid assembly of a wide array of structurally interesting fused pyridines from alkyne‐tethered oximes and alkenes (see scheme). Preliminary biological investigations suggest that some of the fused pyridines exhibit good anti‐inflammatory activity by restoring the imbalance of inflammat...
Article
The Ni-catalyzed reaction of ortho-fluoro-substituted aromatic amides with alkynes results in C-F/N-H annulation to give 1(2H)-isoquinolinones. A key to the success of the reaction is the use of KO t Bu or even weak base, such as Cs2CO3. The reaction proceeds in the absence of a ligand and under mild reaction conditions (40-60 °C). DFT calculations...
Article
Divergent synthesis for precise constructions of cyclic unsymmetrical diaryl disulfides or diselenides and polythiophenes from CF 3 -containing 1,3-enynes and S 8 was developed when the ortho group is F, Cl, Br and NO 2 on aromatic rings. Meanwhile, disulfides (diselenides) were also quickly constructed when the ortho group is H. These transformati...
Article
Full-text available
Medium-sized rings, including those embedded in bridged and fused bicyclic scaffolds, are common core structures of myriad bioactive molecules. Among various synthetic strategies towards their synthesis, intermolecular higher-order cycloaddition provides great potential to build complex medium-sized rings from simple building blocks. Unfortunately,...
Article
The origin and maintenance of axial chirality on the construction of naphthyl-C2-indoles via the asymmetric annulation of ortho-alkynylaniline catalyzed by a chiral Brønsted base (cinchonine-thiourea) have been systematically explored by density functional theory (DFT). Several key processes are included in the general mechanism of this kind of rea...
Article
A divergent synthesis for construction of cyclic unsymmetrical diaryl disulfides, diselenides, and polythiophenes from CF3‐containing 1,3‐enynes (ortho=F, Cl, Br, NO2, S8) was developed. Disulfides (diselenides) were constructed under mild conditions for ortho=H. These transformations undergo a cascade thiophene construction/selective C3‐position t...
Article
A palladium/DPEphos-catalyzed intermolecular trans-selective carbofunctionalization of internal alkynes has been established herein. This method proceeds through a formal anti-carbopalladation, forming trans-alkenyl palladium species, which was trapped by aryl boronic acids to provide all-carbon tetrasubstituted alkenes in 32−92% yields. The trans-...
Preprint
Full-text available
The higher-order cycloadditions are powerful strategies for construction of polycycles in one step, however an efficient and concise version for asymmetric induce is limited. N-heterocyclic carbenes are widely used organocatalysts for asymmetric synthesis and will be an ideal choice for enantioselective higher-order cycloadditions. Here we report a...
Article
Light-driven carbon dioxide (CO2) capture and utilization is one of the most fundamental reactions in Nature. Herein, we report the first visible-light-driven photocatalyst-free hydrocarboxylation of alkenes with CO2. Diverse acrylates and styrenes, including challenging tri- and tetrasubstituted ones, undergo anti-Markovnikov hydrocarboxylation wi...
Article
Catalytic difunctionalization of alkenes is a powerful and efficient tool to synthesize complex molecules from simple starting materials. Remote difunctionalization of unactivated alkenes is more challenging but highly attractive tactic to install two functional groups across long distances. Herein, we report the first remote difunctionalization of...
Article
Full-text available
The influence of biochar on the soil structure and aggregate stability has been debated in previous studies. To probe the action of biochar on soil aggregates, a 5-year field experiment was implemented in the brown earth soil of northeastern China. We determined the aggregate distribution (> 2000 μm, 250–2000 μm, 53–250 μm, and < 53 μm) and organic...
Article
Catalytic difunctionalization of alkenes is a powerful and efficient tool to synthesize complex molecules from simple starting materials. Remote difunctionalization of unactivated alkenes is more challenging but highly attractive tactic to install two functional groups across long distances. Herein, we report the first remote difunctionalization of...
Article
A theoretical study of the mechanism and regioselectivity of 1,3‐dipolar cycloaddition of nitrile oxides to 3‐methylene indolone has been performed by density functional theory at the M06‐2X/6‐311++G(d,p) level of theory. The results indicate that the concerted pathway is more favorable than the stepwise pathway. Investigation of the regioselectivi...
Article
Herein, we report microwave-assisted catalytic enantioselective amination of tetralin- and indane-derived alcohols to produce the corresponding chiral amines that are important structural motif in numerous biologically active entities. By the use of an iridium/phosphoric acid cooperative catalytic system, a range of easily accessible alcohol substr...
Article
The Cover Feature shows ortho‐bromophenylnaphthalenols and acetylene substrates that, just like the fish in the sea, jump through an energy barrier to achieve the spiroannulation product. In their Full Paper, X. Luo et al. performed DFT calculations to investigate the mechanism and enantioselectivity of Pd‐catalyzed spiroannulation of ortho‐bromoph...
Article
By switching the reactivity of Pd‐containing dipolar intermediates from all‐carbon 1,3‐dipoles to oxo‐1,5‐dipoles, Pd‐catalyzed asymmetric [5+2] cycloadditions of vinylcyclopropanes (VCPs) with photogenerated ketenes are achieved. A variety of chiral seven‐membered lactone‐fused polycyclic molecules are produced with good reaction efficiency and se...
Article
Vinylcyclopropanes (VCPs) are commonly used in transition metal‐catalyzed cycloadditions, and the exploitation of their recently realized reactivities to construct new cyclic architectures is of great significance in modern synthetic chemistry. Herein, a palladium‐catalyzed, visible light‐driven, asymmetric [5+2] cycloaddition of VCPs with α‐diazok...
Article
CF3-containing multi-borylated compounds are intriguing molecules that can serve as building blocks and readily transform into various significant molecules. Here, a series of Cu-catalyzed assembly of 1,3- and 1,4-diborylated compounds bearing CF3 group starting from readily available 1,3-enynes has been developed. This is the first example that co...
Article
A palladium-catalyzed asymmetric allylation of N-fluorenyl trifluoromethyl imine with allylic acetates is disclosed. This method provides scalable and efficient access to polysubstituted chiral α-trifluoromethyl amines bearing two adjacent stereocenters and one allyl group in high yields with excellent regio-, diastereo-, and enantioselectivity. Im...
Article
The possible mechanisms and origin of selectivities in N-heterocyclic carbene (NHC)-catalyzed reactions of an aliphatic ester with aminochalcone were studied using density functional theory. Herein, a general mechanistic map involving various types of possible intermediates was discovered, and the corresponding chemoselective pathways were systemat...
Article
Ir catalysis is widely used in hydrogenation reactions to transform unsaturated molecules to the corresponding saturated molecules. Understanding the reaction mechanism is helpful for design of new Ir-catalyzed hydrogenation reactions, as well as for controlling the regio/stereoselectivity. Density functional theory is a powerful tool for mechanist...
Article
The mechanism of copper-mediated coupling reactions has aroused widespread interest, and it has been found to not be as simple as initially thought. In this article, we give an overview of the recent advances in this field. Notably, we focus on whether the presence of CuIII is adopted in the catalytic cycle. Attention is paid to the key CuII specie...
Article
Higher‐order cycloadditions, particularly [8+2] cycloadditions, are a straightforward and efficient strategy for constructing significant medium‐sized architectures. Typically, configuration‐restrained conjugated systems are utilized as 8π‐components for higher‐order concerted cycloadditions. However, for this reason, 10‐membered monocyclic skeleto...
Article
With the help of visible‐light irradiation and a chiral palladium catalyst, enantioselective [8+2] cycloaddition of vinyl carbomates and α‐diazoketones has been accomplished with high peri‐, chemo‐ and stereoselectivity. This protocol provides an unprecedented and straightforward route to 10‐membered monocyclic products bearing chiral quaternary st...
Article
The reductive elimination from a high-valent late-transition-metal complex for the formation of a carbon-carbon or carbon-heteroatom bond represents a fundamental product-forming step in a number of catalytic processes. While reductive eliminations from well-defined Pt(IV), Pd(IV), Ni(III)/Ni(IV) and Au(III) complexes have been studied, the analogo...
Article
Full-text available
Purpose To compare the effects of maize stover and its biochar on soil P fractions and investigate the effects of different stover incorporation practices (direct return or pyrolysis) on the transformation of soil P fractions after a long-term field experiment. Materials and methods Total P, Olsen-P, inorganic P fractions, and organic P fractions...
Article
Pd‐catalyzed spiroannulation of bromophenylnaphthale‐nols with acetylenes to achieve asymmetric dearomatization is a powerful way to construct chiral spiro ‐compounds. DFT calculations with the M06 functional have been performed to reveal the mechanism and enantioselectivity of this reaction. After reversible oxidative addition of aryl bromide to P...
Article
In this work, millimeter-scale Si3N4@SiOx core-shell structure nanowires were synthesized using the direct nitridation method without the use of catalysts. The silicon powders used as raw materials were pretreated at 1300 °C for 3 h under ammonia. The ammonia was then converted into a nitrogen/hydrogen gas mixture and heated at 1350 °C for another...
Article
Hyperoxaluria is well known to cause renal injury and end-stage kidney disease. Previous studies suggested that the renal function of rats with hyperoxaluria was improved after dietary vinegar intake. However, its underlying mechanisms remain largely unknown. The aim of the present study was to examine changes of gut microbiota and blood and urinar...
Article
In this work, SiOx coatings with different crystallinity are successfully prepared on the surface of the silicon (Si) particles by dry oxidation and wet oxidation. The SiOx coatings formed by low-temperature dry oxidation are not only continuous and uniform, but also have the low crystallinity. Theoretically, the continuous, uniform and low-crystal...
Article
Protecting-group-free total syntheses of natural products norascyronone A and norascyronone B were accomplished in eight steps from the commercially available starting material 1-bromo-4-methoxy-2-methylbenzene. The key step was a Mn/Cu-mediated oxidative cascade annulation reaction that formed the tetracyclic core of the target molecules bearing v...