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Self-calibrating luminescent thermometry employing luminescence within the optical transparency windows provides a promising prospect for temperature measurement in the biological fields. In this work, a new Nd3+/Yb3+-codoped metal–organic framework Nd0.95Yb0.05BPTC showing three-dimensional anionic network, obtained by reacting ligand [1,1′-biphenyl]-3,3′,5,5′-tetracarboxylic acid (H4BPTC) with Nd3+ and Yb3+ ions under solvothermal conditions, is reported. Upon 808 nm photoexcitation, Nd0.95Yb0.05BPTC simultaneously emits the characteristic near-infrared luminescence of Nd3+ and Yb3+ ions based on the efficient energy transfer from Nd3+ to Yb3+ ions. In addition, the emission intensity ratio of Yb3+ and Nd3+ shows good exponential-like response to temperature in the physiological range of 293–323 K. The feature properties of Nd0.95Yb0.05BPTC include near-infrared absorption and emission, favorable temperature sensitivity and accurate temperature uncertainty, as well as good chemical stability, making such system useful in biomedical applications.

Fabrication of dual-emitting materials for H2S sensing under environmental and biological conditions is currently of great interest. In this work, a new chemically stable metal supramolecular complex [Zn2(pda)2(H2O)3]·(H2O)0.5 (Znpda, pda = 1,10-phenanthroline-2,9-dicarboxylic acid), with accessible uncoordinated carboxylic oxygen sites, is solvothermally synthesized. It can serve as a host in luminescent hybrid composites. By incorporating Eu3+ and Cu2+ in the supramolecular coordination network, we obtained the dual-emitting hybrid material Eu3+/Cu2+@Znpda, which simultaneously shows intense ligand and weak Eu3+ emissions in HEPES buffer solution. Since H2S can easily chelate with Cu2+ and recover the blocked "antenna effect" between the ligand and Eu3+, Eu3+/Cu2+@Znpda possesses both the turn-on and ratiomectric fluorescence response to H2S. Accordingly, we designed an IMPLICATION logic gate for H2S recognition by employing the fluorescence intensity ratio between the ligand and Eu3+ as the output signal. In addition, Eu3+/Cu2+@Znpda shows a fast response (

Transform invariant low-rank textures, referred to as TILT, can accurately and robustly extract textural or geometric information in a 3D from user-specified windows in 2D in spite of significant corruptions and warping. It was discovered that the task can be characterized, both theoretically and numerically, by solving a sequence of matrix nuclear-norm and $$\ell _1$$ -norm involved convex minimization problems. For solving this problem, the direct extension of alternating direction method of multipliers (ADMM) in an usual Gauss–Seidel manner often performs numerically well in practice but there is no theoretical guarantee on its convergence. In this paper, we resolve this dilemma by using the novel symmetric Gauss–Seidel (sGS)-based ADMM developed by Li et al. (Math Program 155:333–373, 2016). The sGS-ADMM is guaranteed to converge, and we shall demonstrate in this paper that it is also practically efficient than the directly extended ADMM. When the sGS technique is applied to this particular problem, we show that only one variable needs to be re-updated, and this updating hardly imposes any excessive computational cost. The sGS decomposition theorem of Li et al. (Math. Program., 2018. https://doi.org/10.1007/s10107-018-1247-7 ) establishes the equivalent between sGS-ADMM and the classical ADMM with an additional semi-proximal term, so the convergence result is followed directly. Extensive experiments illustrate that the sGS-ADMM and its generalized variant have superior numerical efficiency over the directly extended ADMM.

The recent designed non-linear conjugate gradient method of Dai and Kou [SIAM J Optim. 2013;23:296–320] is very efficient currently in solving large-scale unconstrained minimization problems due to its simpler iterative form, lower storage requirement and its closeness to the scaled memoryless BFGS method. Just because of these attractive properties, this method was extended successfully to solve higher dimensional symmetric non-linear equations in recent years. Nevertheless, its numerical performance in solving convex constrained monotone equations has never been explored. In this paper, combining with the projection method of Solodov and Svaiter, we develop a family of non-linear conjugate gradient methods for convex constrained monotone equations. The proposed methods do not require the Jacobian information of equations, and even they do not store any matrix in each iteration. They are potential to solve non-smooth problems with higher dimensions. We prove the global convergence of the class of the pro...

After several decades of aeromagnetic surveys, the measured data now cover nearly the entire Chinese continent and part of the China Sea. These data were first applied in this research and could provide important insights into the distribution of igneous rocks beneath the earth’s surface. Because different types of igneous rocks have a magnetic difference and produce distinct aeromagnetic anomalies on aeromagnetic ΔT image with reduction to the pole or other data calculating maps. By analyzing more than 240 thousand magnetic susceptibility data points and aeromagnetic anomalies of known igneous rocks in the Chinese continent, it was determined that mafic-ultramafic rocks commonly have a high magnetic susceptibility and cause linear and strong positive aeromagnetic anomalies. Intermediate-felsic rocks have a stable and low magnetic susceptibility and show a flat gradient variation and regular shape. Volcanic rocks have large variability in regard to magnetic susceptibility and romance; therefore, the aeromagnetic anomalies are always random or show variation within a planar area and decrease rapidly when an upward continuation is applied. Following the aeromagnetic data and calculating the maps of the vertical first order derivative and the tilt derivative, and combining this information with known outcrops of igneous rocks, we renewed the boundaries of 82 known mafic-ultramafic rocks, 228 known intermediate-felsic rocks and 131 known volcanic rocks. In addition, we newly mapped concealed igneous rocks of 203 mafic-ultramafic rocks, 2322 intermediate-felsic rocks and 494 volcanic rocks. The igneous rocks can be identified as nine ultra-mafic belts, 10 mafic belts (or regions), 27 intermediate-felsic belts and eight volcanic blocks. The results indicate that the mafic-ultramafic rocks are mainly distributed in Tibet, Erenhot of Inner Mongolia and northern Qilian and the smaller zones in the western Kunlun, Tianshan, western Junggar, eastern Tibet, Maqin in Gansu and the Ailao Mountain (Mtn.) areas. The mafic rocks are mostly outcropped in northern Tibet, southwestern Sanjiang, Kangdian in Sichuan, Baise and Rongjiang in Guangxi, Yinjiang in Guizhou, Dabashan Mtn., Southern Dabie Mtn, Bangbu in Anhui, Qiemo in Xinjiang. The intermediate-felsic rocks are mainly located in the orogenic system and rarely within the craton. Volcanic rocks are widely developed in eastern and western China such as the circumference of Songliao Basin, Erlian Basin, the southern Yellow Sea - Subei Basin, Bohai Bay Basin, eastern Zhejiang, the circumference of Hainan Island, southern Sichuan - northern Yunan, central Tibet, the Bachu area in Tarim Basin, Junggar Basin and Turpan-Hami Basin.

We review the latest aeromagnetic geological data of continental China. We discuss the latest achievements in geological mapping and the newly detected features based on aeromagnetic data. Using aeromagnetic data collected for more than 50 years, a series of 1:5000000 and 1:1000000 aeromagnetic maps of continental China were compiled using state-of-the-art digital technology, and data processing and transformation. Guided by plate tectonics and continental dynamics, rock physical properties, and magnetic anomalies, we compiled maps of the depth of the magnetic basement of continental China and the major geotectonic units, and presented newly detected geological structures based on the aeromagnetic data.

The degradation of biphenol A polycarbonate under the combined action of the photo- and thermal-irradiation in the presence of humidity and oxygen was studied by tensile testing and physicochemical characterizations. A ductile-brittle-ductile transition dissimilar to previously reported aging-induced-embrittlement (ductile-brittle transition) has been revealed in the present article. Further increasing aging time (longer than 650 h) after ductile-brittle transition leads to the rejuvenation in ductile rather than continuous deterioration. Occurring with the second brittle-ductile transition, a competition between oxidation-induced chain scission and crosslinking has also been recorded by FTIR and DSC. Meanwhile, SEM results exclude the possibility that the rejuvenation in ductile is from the change in surface morphology upon aging. Thus, the aging-induced ductile-brittle-ductile transition could result from, at least partly, the competition between oxidation-induced chain-scission and chain crosslinking.