Flat electronic band structure and anisotropic optical, mechanical, and thermoelectric properties of two-dimensional fullerene networks

Nanoclusters like fullerenes as the unit to build intriguing two-dimensional topological structures is of great challenge. Here we propose three bridged fullerene monolayers and comprehensively investigate the novel fullerene monolayer as synthesized experimentally Zheng et al.,[Nature 606, 507-510 (2022)] by state of the art first principles calculations. Our results show that alpha-C60-2D has a direct bandgap of 1.49 eV owing to a flat conduction band bottom close to the experimental value, the optical linear dichroism with strong absorption in long-wave ultraviolet region, a small anisotropic Youngs modulus, the large hole mobility, and the ultrahigh Seebeck coefficient at middle low temperatures. Moreover, Li ions are found to migrate easily along the X path in alpha-C60-2D. It is unveiled that the anisotropic optical, mechanical, electrical, and thermoelectric properties of alpha-C60-2D originate from the asymmetric bridging arrangements between C60 clusters. Our study promises potential applications of monolayer fullerene networks in diverse fields

Thermally Driven Pure Spin and Valley Currents via the Anomalous Nernst Effect in Monolayer Group-VI Dichalcogenides

Spin and valley dependent anomalous Nernst effect are analyzed for monolayer MoS2 and other group-VI dichalcogenides. We find that pure spin and valley currents can be generated perpendicular to the applied thermal gradient in the plane of these two-dimensional materials. This effect provides a versatile platform for applications of spin caloritronics. A spin current purity factor is introduced to quantify this effect. When time reversal symmetry is violated, e.g. two-dimensional materials on an insulating magnetic substrate, a dip-peak feature appears for the total Nernst coefficient. For the dip state it is found that carriers with only one spin and from one valley are driven by the temperature gradient.Comment: 5 pages, 5 figures, will appear in Physical Review Letter

Spin-Caloritronic Batteries

The thermoelectric performance of a topological energy converter is analyzed. The H-shaped device is based on a combination of transverse topological effects involving the spin: the inverse spin Hall effect and the spin Nernst effect. The device can convert a temperature drop in one arm into an electric power output in the other arm. Analytical expressions for the output voltage, the figure-of-merit (ZT) and energy converting efficiency are reported. We show that the output voltage and the ZT can be tuned by the geometry of the device and the physical properties of the material. Importantly, contrary to a conventional thermoelectric device, here a low electric conductivity may in fact enhance the ZT value, thereby opening a path to new strategies in optimizing the figure-of-merit.Comment: 12 pages, 3 figures, accepted by Phys. Rev. Applie

Experience in nursing hydronephrosis with infection during pregnancy

目的  探讨妊娠合并肾积水伴感染患者的护理要点。方法  本组选取自2014年6月—2015年2月于徐州医学院附属医院住院的20例妊娠合并肾积水伴感染的患者，通过及早进行经尿道膀胱输尿管支架管置入术，并给予密切观察病情变化、预防感染及并发症、配合心理护理以及液体疗法。结果  20例患者全部顺利置入输尿管双J管，术中和术后无明显并发症，经抗炎治疗后所有患者48h内体温恢复正常，腰痛症状消失。胎儿出生后无畸形、智力障碍及先天性疾病报告。结论  根据妊娠期肾积水伴感染的特点进行早期护理干预、监测孕妇及胎儿情况并做好术前心理护理、完善术前准备；术中密切监测患者生命体征；术后做好并发症护理、完善出院指导对提高治愈率、促进患者早日康复有重要意义。Objective: To investigate the nursing points of hydronephrosis with infection during pregnancy. Methods: 20 cases of hydronephrosis with infection during pregnancy from June 2014 to January 2015 received bladder transurethral ureteral stent implantation. Close observation of the disease changes together with psychological care and fluid therapy was given for prevention of infection and complications. Results: Ureteral double J tubes were successfully implanted in 20 patients. No significant complications were detected during and after surgery. After anti-inflammatory treatment, body temperature and lumbago of all patients returned to normal within 48 h. No fetal malformations, mental retardation and congenital diseases were reported. Conclusion: Early nursing intervention for pregnant women and fetus should be performed according to characteristics of gestational hydronephrosis with infection during pregnancy, and monitor the situation, make the preoperative psychological nursing, and improve the preoperative preparation. Close intraoperative monitoring of vital signs of patients is essential. Postoperative nursing care of the complications and improvement of the discharge guidance are important to increase the cure rate and to promote the recovery of the patients

Apical-Basal Polarity Signaling Components, Lgl1 and aPKCs, Control Glutamatergic Synapse Number and Function.

Normal synapse formation is fundamental to brain function. We show here that an apical-basal polarity (A-BP) protein, Lgl1, is present in the postsynaptic density and negatively regulates glutamatergic synapse numbers by antagonizing the atypical protein kinase Cs (aPKCs). A planar cell polarity protein, Vangl2, which inhibits synapse formation, was decreased in synaptosome fractions of cultured cortical neurons from Lgl1 knockout embryos. Conditional knockout of Lgl1 in pyramidal neurons led to reduction of AMPA/NMDA ratio and impaired plasticity. Lgl1 is frequently deleted in Smith-Magenis syndrome (SMS). Lgl1 conditional knockout led to increased locomotion, impaired novel object recognition and social interaction. Lgl1+/- animals also showed increased synapse numbers, defects in open field and social interaction, as well as stereotyped repetitive behavior. Social interaction in Lgl1+/- could be rescued by NMDA antagonists. Our findings reveal a role of apical-basal polarity proteins in glutamatergic synapse development and function and also suggest a potential treatment for SMS patients with Lgl1 deletion