In this study, we established a rapid acid digestion for determining Hf–Sr–Nd isotopic ratios of geological samples by using MC-ICP-MS. Conditions of 1600 °C for 1 min and 1400 °C for 1 min were adopted fo...In this study, we established a rapid acid digestion for determining Hf–Sr–Nd isotopic ratios of geological samples by using MC-ICP-MS. Conditions of 1600 °C for 1 min and 1400 °C for 1 min were adopted for fusing intrusive rocks and extrusive rocks, respectively. The rapid acid digestion technique is superior in digestion time compared with high-pressure PTFE bomb method. The procedural blanks of the method were also lower than that flux fusion. Replicate analyses of international certified reference materials(CRMs) indicate that isotopic ratios of ^(176)Hf/^(177)Hf,^(87)Sr/^(86)Sr and^(143)Nd/^(144)Nd agree well with previously published data. The external reproducibility(2 SD, n = 5) of ten CRMs are ±0.000030 for87 Sr/86 Sr,±0.000030 for ^(143)Nd/^(144)Nd, and ±0.000018 for ^(176)Hf/^(177)Hf.展开更多
Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy ana...Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy analysis has been carriedout at the HF 6-31G展开更多
The demand for procedures aiming to rejuvenate the upper third part of the face and the periocular region has increased in the past several years.Blepharoplasty is one of the most frequently performed procedures world...The demand for procedures aiming to rejuvenate the upper third part of the face and the periocular region has increased in the past several years.Blepharoplasty is one of the most frequently performed procedures worldwide to date.Surgery is currently the first choice in order to achieve permanent and effective results;however,it is burdened by potential surgical complications feared by patients.There is an increasing trend in individuals to request less invasive,non-surgical,effective,and safe procedures for eyelid treatment.The aim of this minireview is to present a brief overview of non-surgical blepharoplasty techniques that have been reported in the literature in the past 10 years.Numerous modern techniques that provide a rejuvenation of the entire area have been described.Numerous less invasive methods have been proposed in the current literature and in modern-day routine clinical settings.Dermal fillers are a commonly chosen option for providing enhanced aesthetic results,especially considering that volume loss can be one of the main underlying causes of facial and periorbital aging.Deoxycholic acid use may be considered when the problem is represented by periorbital excess fat deposits.The simultaneous excess and loss of elasticity of the skin can be assessed with techniques such as lasers and plasma exeresis.Furthermore,techniques such as platelet-rich plasma injections and the insertion of twisted polydioxanone threads are emerging as viable methods to rejuvenate the periorbital region.展开更多
基金supported by the National Natural Science Foundation of China (Grant Nos. 41421002, 41427804, and 41373004)the MOST Research Foundation from the State Key Laboratory of Continental Dynamics (Grant Nos. BJ08132-1, 207010021, and 201210004)
文摘In this study, we established a rapid acid digestion for determining Hf–Sr–Nd isotopic ratios of geological samples by using MC-ICP-MS. Conditions of 1600 °C for 1 min and 1400 °C for 1 min were adopted for fusing intrusive rocks and extrusive rocks, respectively. The rapid acid digestion technique is superior in digestion time compared with high-pressure PTFE bomb method. The procedural blanks of the method were also lower than that flux fusion. Replicate analyses of international certified reference materials(CRMs) indicate that isotopic ratios of ^(176)Hf/^(177)Hf,^(87)Sr/^(86)Sr and^(143)Nd/^(144)Nd agree well with previously published data. The external reproducibility(2 SD, n = 5) of ten CRMs are ±0.000030 for87 Sr/86 Sr,±0.000030 for ^(143)Nd/^(144)Nd, and ±0.000018 for ^(176)Hf/^(177)Hf.
文摘Results of ab initio SCF calculations of tetrathiosquaric acid (3, 4-dithiohydroxy-3-cyclobuten-1, 2-dithione) are reported. The ZZ isomer is found to bethe most stable among the three isomers. An isodesmic energy analysis has been carriedout at the HF 6-31G
文摘The demand for procedures aiming to rejuvenate the upper third part of the face and the periocular region has increased in the past several years.Blepharoplasty is one of the most frequently performed procedures worldwide to date.Surgery is currently the first choice in order to achieve permanent and effective results;however,it is burdened by potential surgical complications feared by patients.There is an increasing trend in individuals to request less invasive,non-surgical,effective,and safe procedures for eyelid treatment.The aim of this minireview is to present a brief overview of non-surgical blepharoplasty techniques that have been reported in the literature in the past 10 years.Numerous modern techniques that provide a rejuvenation of the entire area have been described.Numerous less invasive methods have been proposed in the current literature and in modern-day routine clinical settings.Dermal fillers are a commonly chosen option for providing enhanced aesthetic results,especially considering that volume loss can be one of the main underlying causes of facial and periorbital aging.Deoxycholic acid use may be considered when the problem is represented by periorbital excess fat deposits.The simultaneous excess and loss of elasticity of the skin can be assessed with techniques such as lasers and plasma exeresis.Furthermore,techniques such as platelet-rich plasma injections and the insertion of twisted polydioxanone threads are emerging as viable methods to rejuvenate the periorbital region.
