It is proposed in this paper the control system of a MEMS strong-link for PC authentication system,which is composed of MEMS strong-link, interface card and dedicated software. The strong-link is comprised of amulti-t...It is proposed in this paper the control system of a MEMS strong-link for PC authentication system,which is composed of MEMS strong-link, interface card and dedicated software. The strong-link is comprised of amulti-try counter-meshing gears （CMG） discrimination device based on micro electromeehanical system （MEMS）technology. The control system is consist of micro-motor driving system, electrical control system and dedicatedsoftware program. The PCI-7248 DIO extending card and L6234 bmshless DC motor driven IC are applied for thecontrol of MEMS strong-link. The authentication system on PC startup is controlled by the program in BIOS chip,which gets the control during the POST of PC. The discrimination device has the function of automatic resettingwith correct code, which can be tried 3 times. The success rate in 1000 times is 100%.展开更多
Background： Percutaneous brachytherapy is a valuable method for the treatment of lung cancer and mediastinal lymph nodes metastasis. However, in some of the metastatic lymph nodes in the middle mediastinum, the percu...Background： Percutaneous brachytherapy is a valuable method for the treatment of lung cancer and mediastinal lymph nodes metastasis. However, in some of the metastatic lymph nodes in the middle mediastinum, the percutaneous approach cannot be used safely due to possible damage to surrounding anatomical structures. We established an animal model （group of 12 pigs） to assess the safety and feasibility of computed tomography （CT）-guided vena cava puncture. Methods： Under CT guidance, an 18G needle was used to puncture the anterior wall of the anterior vena cava （AVC） in 12 pigs. The 18G needle was chosen as it is similar in size to the needles employed for clinical application in brachytherapy. The incidence of complications and vital signs was monitored during the procedure. Thoracotomy was performed to remove AVC specimens, which were analyzed for histological evidence of vessel wall damage and repair. Results： Following postoperative enhanced CT, two animals were found to have a small pneumothorax （one being hemopneumothorax）. The intraoperative oxygen saturation of both animals was not significantly decreased and was maintained at 93-100%. No animals developed mediastinal hematoma. Preoperative, intraoperative, and postoperative changes in blood pressure, heart rate, hemoglobin, and blood oxygen saturation were not significant. Histological evaluation of AVC specimens showed that by 7 days following the procedure, the endothelial layer was smooth with notable scar repair in the muscularis layer. Conclusions： CT performed after the procedure and histological preparations confirmed the safety of the procedure. This indicates that percutaneous brachytherapy for metastatic middle mediastinal lymph nodes can be carried out via the superior vena cava.展开更多
The incorporation of B element into π-conjugated system is an efficient strategy to tune the steric and electronic structure and thus optoelectronic properties of π-electron systems.The vacant p orbital on the trico...The incorporation of B element into π-conjugated system is an efficient strategy to tune the steric and electronic structure and thus optoelectronic properties of π-electron systems.The vacant p orbital on the tricoordinate B center makes it exhibit several electronic and steric features,such as electron-accepting ability through p-π~＊ conjugation,the high Lewis acidity to coordinate with Lewis bases,as well as the steric bulk arising from the aryl substituent on the B center to get enough kinetic stability.As a result,the boryl group is a very unique electron acceptor.When an electron-donating amino group is present,the triarylboranes would display intense intramolecular charge transfer transitions,which lead to interesting optoelectronic properties and great utilities.This short review summarizes the recent progress in π-electron systems,which contain both B and N elements and thus display intramolecular charge-transfer transitions.The triarylboranes are introduced based on their structural features,including the linear π-system with boryl and amino groups at the terminal positions,the lateral borylsubstituted π-system with amino groups at the terminal positions,the biphenyl π-system with an amino and a boryl groups at o,o＇-positions,nonconjugated U- and V-shaped π-system,macrocylcic π-system with B and N embedded in the ring,B,N-bridged ladder-type π-system,as well as the polycyclicπ-system with B embedded in the center.展开更多
基金supported by The Project-sponsored by SRF for ROCS,SEM,National Natural Science Foundation of China ( No. 51402258)Xiamen city science and technology plan (No. 3502Z20130050)
文摘It is proposed in this paper the control system of a MEMS strong-link for PC authentication system,which is composed of MEMS strong-link, interface card and dedicated software. The strong-link is comprised of amulti-try counter-meshing gears （CMG） discrimination device based on micro electromeehanical system （MEMS）technology. The control system is consist of micro-motor driving system, electrical control system and dedicatedsoftware program. The PCI-7248 DIO extending card and L6234 bmshless DC motor driven IC are applied for thecontrol of MEMS strong-link. The authentication system on PC startup is controlled by the program in BIOS chip,which gets the control during the POST of PC. The discrimination device has the function of automatic resettingwith correct code, which can be tried 3 times. The success rate in 1000 times is 100%.
文摘Background： Percutaneous brachytherapy is a valuable method for the treatment of lung cancer and mediastinal lymph nodes metastasis. However, in some of the metastatic lymph nodes in the middle mediastinum, the percutaneous approach cannot be used safely due to possible damage to surrounding anatomical structures. We established an animal model （group of 12 pigs） to assess the safety and feasibility of computed tomography （CT）-guided vena cava puncture. Methods： Under CT guidance, an 18G needle was used to puncture the anterior wall of the anterior vena cava （AVC） in 12 pigs. The 18G needle was chosen as it is similar in size to the needles employed for clinical application in brachytherapy. The incidence of complications and vital signs was monitored during the procedure. Thoracotomy was performed to remove AVC specimens, which were analyzed for histological evidence of vessel wall damage and repair. Results： Following postoperative enhanced CT, two animals were found to have a small pneumothorax （one being hemopneumothorax）. The intraoperative oxygen saturation of both animals was not significantly decreased and was maintained at 93-100%. No animals developed mediastinal hematoma. Preoperative, intraoperative, and postoperative changes in blood pressure, heart rate, hemoglobin, and blood oxygen saturation were not significant. Histological evaluation of AVC specimens showed that by 7 days following the procedure, the endothelial layer was smooth with notable scar repair in the muscularis layer. Conclusions： CT performed after the procedure and histological preparations confirmed the safety of the procedure. This indicates that percutaneous brachytherapy for metastatic middle mediastinal lymph nodes can be carried out via the superior vena cava.
基金the National Natural Science Foundation of China(Nos.21072117,21272141,21572120)for financial support
文摘The incorporation of B element into π-conjugated system is an efficient strategy to tune the steric and electronic structure and thus optoelectronic properties of π-electron systems.The vacant p orbital on the tricoordinate B center makes it exhibit several electronic and steric features,such as electron-accepting ability through p-π~＊ conjugation,the high Lewis acidity to coordinate with Lewis bases,as well as the steric bulk arising from the aryl substituent on the B center to get enough kinetic stability.As a result,the boryl group is a very unique electron acceptor.When an electron-donating amino group is present,the triarylboranes would display intense intramolecular charge transfer transitions,which lead to interesting optoelectronic properties and great utilities.This short review summarizes the recent progress in π-electron systems,which contain both B and N elements and thus display intramolecular charge-transfer transitions.The triarylboranes are introduced based on their structural features,including the linear π-system with boryl and amino groups at the terminal positions,the lateral borylsubstituted π-system with amino groups at the terminal positions,the biphenyl π-system with an amino and a boryl groups at o,o＇-positions,nonconjugated U- and V-shaped π-system,macrocylcic π-system with B and N embedded in the ring,B,N-bridged ladder-type π-system,as well as the polycyclicπ-system with B embedded in the center.
