Experimental investigations and improvements for the 10 K G-M refrigerator

Abstract

With the wide application of high performance cryo-pumps, high and low temperature superconducting devices, MRI, infrared detectors and cryogenic electronics, the development of high efficient and reliable 10 K G-M refrigerator is of critical importance and awaited by cryogenic industries. In the past two years, systematic studies have been carried out, and detailed experimental tests indicated that the cooling performance of the 10 K G-M refrigerator was improved by adding two additional rectification meshes inside the low temperature regenerator and by optimizing the system charge pressure. Furthermore, a new labyrinth sealing displacer was proposed and fabricated to substitute the traditional piston-ring sealing displacer for improved operating stability and reliability of the 10 K G-M refrigerator. The detailed experimental results and improvements were summarized and their optimal cases were given in this paper.

Polymorphism in [Ag(bpetan)]n Coordination Polymers with Nitrate and Isophthalate Anions: Photocatalytic and Antibacterial Activity, Hemolysis Assay and Study of Cytotoxicity

“…, so that the metals adopt a non-trigonal tricoordinated geometry. The Ag-N bond lengths (Table S3) are comparable to those noticed in related complexes, [29][30][31][32] but slightly shorter by ca. 0.03 Å than those measured in CP1.…”

“…The Ag-N bond distances fall in the range 2.152(6)-2.193(6) Å, while Ag-O interactions are significantly longer, in between 2.630(6)-2.889(6) Å, as detected in similar complexes. [29][30][31][32] As a matter of fact Ag(I) ions 1,3,4,6,8 are tri-coordinated while 2,5,7 are tetracoordinated (Table S2). Figure 2 shows the slight different orientations assumed by the py rings and the different bridging mode of the eight nitrate anions that employ either two or three oxygen atoms to connect metals.…”

“…In this context, comparing the emission profile of the free ligands and of the Ag complexes, we can conclude that the emission behavior of CP1 and CP2 is a cumulative effect of the metal perturbed intra ligand π*-π and π*-n CT transitions. [29][30][31][32]…”

Synthesis and Characterization of 2D and 3D Zinc(II) Coordination Polymers with High Photocatalytic Activities for Removal of Methylene Blue Dye

“…[14][15][16][17] Organic multicarboxylate ligands present versatile coordination modes and are very effective building blocks for the construction of multidimensional CPs. [18][19][20] The mixed-ligands system of flexible bis(benzimidazole) and multicarboxylate Odonor ligands can yield unusual CPs with intriguing topologies and novel properties. [21,22] Two Zn II CPs {[Zn 2 (L)(MIPA) 2 ]·2H 2 O} n (1) and {[Zn(L)(H 2 FA)]·2H 2 O} n (2) were hydrothermally synthesized and structurally characterized.…”

CXCR7 expression correlates with tumor depth in cutaneous squamous cell carcinoma skin lesions and promotes tumor cell survival through ERK activation

“…It has also been proposed that CXCR7 may form functional heterodimers with CXCR4 and modulate CXCL12-mediated signalling (28). More recent investigations showed that activation of CXCR7 alone by CXCL12 may induce intracellular signalling, including activation of the MAP kinase, Akt and JAK2/STAT3 pathways (29)(30)(31)(32). These signalling pathways may be mediated through the recruitment of b-arrestin (33)(34)(35).…”