再制造符合节能环保减排、可持续发展的国家政策而得到大力发展，并被写入国家法律。再制造成形技术以废旧零件为毛坯，通过离散／堆积的方式恢复零件的形状、尺寸和性能。GMAW堆焊因其具有高效、高结合强度、低成本、易于实现自动化、...再制造符合节能环保减排、可持续发展的国家政策而得到大力发展，并被写入国家法律。再制造成形技术以废旧零件为毛坯，通过离散／堆积的方式恢复零件的形状、尺寸和性能。GMAW堆焊因其具有高效、高结合强度、低成本、易于实现自动化、智能化等优势而成为一种重要的再制造成形技术，近年来引起了广泛的关注。装甲兵工程学院的朱胜构建了机器人GMAW成形再制造系统，制备了集约化成型材料，并探讨了该技术未来的发展趋势。该文发表在《Advances in Manufacturing}2013年第1期。展开更多
Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum chann...Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum channels. They gave the maximal probability of successful teleportation. Here we find that their operation is not the optimal and the successful probability of the teleportation is not maximum. Moreover, we give the optimal schemes operation and obtain maximal successful probability for teleportation.展开更多
Aim L-Arginine· L-aspartate, a double salt, has been recently reported toinhibit platelet aggregation and thrombosis, but its action mechanism is not clear yet. This studywas conducted to investigate its effect o...Aim L-Arginine· L-aspartate, a double salt, has been recently reported toinhibit platelet aggregation and thrombosis, but its action mechanism is not clear yet. This studywas conducted to investigate its effect on FITC-PAC-1, an anti-glycoprotein IIb/IIIa monoclonalantibody binding to activated platelets, and on correlative autacoid levels in plasma or inplatelets in order to explore its potential pathway of inhibiting platelet aggregation andthrombosis. Methods Monoclonal antibody binding to activated platelets was assayed by flowcytometry; NO was assessed by colorimetric method. cAMP, TXB_2 or 6-keto-PGF_(1α) levels wereassessed by radioimmunoassay. Results Gavaged 30 mg·kg^(-1) of L-arginine·L-aspartate increasedboth concentration of NO in plasma and 6-keto-PGF_(1) in incubated supernatant of aortic segment ofrats ex vivo (P < 0.05), but it did not influence cAMP content in platelets and the level of TXB_2or 6-keto-PGF_(1) in plasma of rats, whereas ASA significantly lowered TXB_2 or 6-keto-PGF_(1α) inplasma. Both 100 μmol-L^(-1) of L-arginine ·L-aspartate and ASA inhibited FITC-PAC-1 binding toactivated platelets in vitro. Conclusion The increase in NO and PGI_2 release from endo-thelialcells and consequent inhibition of platelet activation may contribute to the inhibition of plateletaggregation and thrombosis by L-arginine· L-aspartate; whereas arachidonic acid or cAMP metabolicpathway is not closely correlative with the studied effect.展开更多
Recent studies confirm that the emerging bifunctional catalysts consisting of metal oxide and zeolites can directly convert syngas into high-quality gasoline,however,the formation mechanism of iso-paraffins and the di...Recent studies confirm that the emerging bifunctional catalysts consisting of metal oxide and zeolites can directly convert syngas into high-quality gasoline,however,the formation mechanism of iso-paraffins and the difference with the conventional FT/zeolite catalyst have not been investigated.Herein,three one-dimensional SAPO zeolites with diverse micropore sizes were synthesized and assembled with ZnAlO_(x)with spinel structure.It was found that ZnAlO_(x)/SAPO-41 and ZnAlO_(x)/SAPO-11 with medium micropore sizes favored the formation of C_(5)–C_(11)hydrocarbons with a high content of iso-paraffins.The characterizations pointed out that the formation of iso-paraffins over SAPO-11 followed a pore-mouth catalysis mechanism,which means the isomerization of linear hydrocarbons can only take place near the pore mouth region of zeolites.This mechanism only allows the formation of mono-branched iso-paraffins in the C_(5)–C_(11)range,which are less prone to be cracked than their di-branched isomers.A careful comparative analysis between ZnAlO_(x)/SAPO-11 and Co/H-meso-ZSM-5 was also made in terms of product distribution,activity,and stability.展开更多
Objective To evaluate the clinical efficacy of incising spinal pia mater to relieve pressure and unilateral open-door laminoplasty with internal screw fixation for treatment of the dated spinal cord injury. Methods Fr...Objective To evaluate the clinical efficacy of incising spinal pia mater to relieve pressure and unilateral open-door laminoplasty with internal screw fixation for treatment of the dated spinal cord injury. Methods From March, 2009 to July, 2010, 16 cases with chronic cervical cord injury underwent spinal dura mater incision and unilateral open-door laminoplasty with internal screw fixation. Nerve functions of preand postoperation were evaluated by Frankel classification and the Japanese Orthopaedic Association (JOA) scale. The improvement rate of JOA score at the indicated time was recorded. Results Postoperative Frankel classification rating of 16 patients improved obviously. JOA scores at the 1st month, 3rd month, 6th month, and 12th month after surgery were 7.9±2.3, 8.5±1.6, 8.9±2.1, and 12.4±2.5, respectively, and significantly increased compared with that prior to surgery (5.5±0.6). At the end of follow-up period, JOA score was significantly higher than that of pre-treatment (P<0.05). The recovery was relatively rapid during the first 3 months following the surgery, then entered a platform period. Conclusion It is effective for patients with dated spinal cord injury to undergo spinal decompression and laminoplasty.展开更多
In this paper, trellis shaping is applied to reducing the Peak-to-Average Power Ratio(PAPR) of NC-OFDM signals due to the fact that the total number of active subcarriers and their locations might change continuously ...In this paper, trellis shaping is applied to reducing the Peak-to-Average Power Ratio(PAPR) of NC-OFDM signals due to the fact that the total number of active subcarriers and their locations might change continuously in a dynamic spectrum access network.A new branch metric of trellis shaping is proposed which reduces the PAPR of OFDM signals through minimizing the variance of the power by VA decoder.The overall performance considerably depends on the type of signal mapping, and therefore a new type of 64QAM mapping method is designed.Simulation results show that this scheme significantly reduces the PAPR.Finally, a significant phenomenon is demonstrated that the PAPR of NC-OFDM signals in which the deactivated carriers is distributed in the Bernoulli distribution has better performance than that of OFDM signals.展开更多
Objectives To explore the intrinsic factors related to the pathogenesis of acute arterial thrombosis （AAT） and to elucidate the patho- genesis of AAT on the basis of differentially expressed genes. Methods Patients ...Objectives To explore the intrinsic factors related to the pathogenesis of acute arterial thrombosis （AAT） and to elucidate the patho- genesis of AAT on the basis of differentially expressed genes. Methods Patients with acute myocardial infarction （AMI）, stable angina （SA） and healthy controls （n = 20 per group） were recruited, and the whole human genome microarray analysis was performed to detect the differentially expressed genes among these subjects. Results Patients with AMI had disease-specific gene expression pattern. Biological functional analysis showed the function of T cells was significantly reduced, the mitochondrial metabolism significantly decreased, the ion metabolism was abnormal, the cell apoptosis and inflammatory reaction increased, the phagocytosis elevated, the neutrophil-mediated immunity increased and the post-traumatic repair of cells and tissues increased in AMI patients. The biological function in SA group and healthy controis remained stable and was comparable. Conclusions The reduced function ofT cell gene models in AAT showed the dysfunction of the immune system. The pathogenesis of AAT may be related to the inflammatory reaction after arterial intima infection caused by potential pathogenic microorganisms.展开更多
文摘再制造符合节能环保减排、可持续发展的国家政策而得到大力发展，并被写入国家法律。再制造成形技术以废旧零件为毛坯，通过离散／堆积的方式恢复零件的形状、尺寸和性能。GMAW堆焊因其具有高效、高结合强度、低成本、易于实现自动化、智能化等优势而成为一种重要的再制造成形技术，近年来引起了广泛的关注。装甲兵工程学院的朱胜构建了机器人GMAW成形再制造系统，制备了集约化成型材料，并探讨了该技术未来的发展趋势。该文发表在《Advances in Manufacturing}2013年第1期。
基金Supported by the National Natural Science Foundation of China under Grant No. 10902083the Natural Science Foundation of Shannxi Province under Grant No. 2009GM1007
文摘Recently, Xiu et al. [Commun. Theor. Phys. 49 （2008） 905] proposed two schemes of teleporting an N particle arbitrary and unknown state when N groups of three particle general W states are utilized a.s quantum channels. They gave the maximal probability of successful teleportation. Here we find that their operation is not the optimal and the successful probability of the teleportation is not maximum. Moreover, we give the optimal schemes operation and obtain maximal successful probability for teleportation.
文摘Aim L-Arginine· L-aspartate, a double salt, has been recently reported toinhibit platelet aggregation and thrombosis, but its action mechanism is not clear yet. This studywas conducted to investigate its effect on FITC-PAC-1, an anti-glycoprotein IIb/IIIa monoclonalantibody binding to activated platelets, and on correlative autacoid levels in plasma or inplatelets in order to explore its potential pathway of inhibiting platelet aggregation andthrombosis. Methods Monoclonal antibody binding to activated platelets was assayed by flowcytometry; NO was assessed by colorimetric method. cAMP, TXB_2 or 6-keto-PGF_(1α) levels wereassessed by radioimmunoassay. Results Gavaged 30 mg·kg^(-1) of L-arginine·L-aspartate increasedboth concentration of NO in plasma and 6-keto-PGF_(1) in incubated supernatant of aortic segment ofrats ex vivo (P < 0.05), but it did not influence cAMP content in platelets and the level of TXB_2or 6-keto-PGF_(1) in plasma of rats, whereas ASA significantly lowered TXB_2 or 6-keto-PGF_(1α) inplasma. Both 100 μmol-L^(-1) of L-arginine ·L-aspartate and ASA inhibited FITC-PAC-1 binding toactivated platelets in vitro. Conclusion The increase in NO and PGI_2 release from endo-thelialcells and consequent inhibition of platelet activation may contribute to the inhibition of plateletaggregation and thrombosis by L-arginine· L-aspartate; whereas arachidonic acid or cAMP metabolicpathway is not closely correlative with the studied effect.
文摘Recent studies confirm that the emerging bifunctional catalysts consisting of metal oxide and zeolites can directly convert syngas into high-quality gasoline,however,the formation mechanism of iso-paraffins and the difference with the conventional FT/zeolite catalyst have not been investigated.Herein,three one-dimensional SAPO zeolites with diverse micropore sizes were synthesized and assembled with ZnAlO_(x)with spinel structure.It was found that ZnAlO_(x)/SAPO-41 and ZnAlO_(x)/SAPO-11 with medium micropore sizes favored the formation of C_(5)–C_(11)hydrocarbons with a high content of iso-paraffins.The characterizations pointed out that the formation of iso-paraffins over SAPO-11 followed a pore-mouth catalysis mechanism,which means the isomerization of linear hydrocarbons can only take place near the pore mouth region of zeolites.This mechanism only allows the formation of mono-branched iso-paraffins in the C_(5)–C_(11)range,which are less prone to be cracked than their di-branched isomers.A careful comparative analysis between ZnAlO_(x)/SAPO-11 and Co/H-meso-ZSM-5 was also made in terms of product distribution,activity,and stability.
文摘Objective To evaluate the clinical efficacy of incising spinal pia mater to relieve pressure and unilateral open-door laminoplasty with internal screw fixation for treatment of the dated spinal cord injury. Methods From March, 2009 to July, 2010, 16 cases with chronic cervical cord injury underwent spinal dura mater incision and unilateral open-door laminoplasty with internal screw fixation. Nerve functions of preand postoperation were evaluated by Frankel classification and the Japanese Orthopaedic Association (JOA) scale. The improvement rate of JOA score at the indicated time was recorded. Results Postoperative Frankel classification rating of 16 patients improved obviously. JOA scores at the 1st month, 3rd month, 6th month, and 12th month after surgery were 7.9±2.3, 8.5±1.6, 8.9±2.1, and 12.4±2.5, respectively, and significantly increased compared with that prior to surgery (5.5±0.6). At the end of follow-up period, JOA score was significantly higher than that of pre-treatment (P<0.05). The recovery was relatively rapid during the first 3 months following the surgery, then entered a platform period. Conclusion It is effective for patients with dated spinal cord injury to undergo spinal decompression and laminoplasty.
基金Supported by the National Natural Science Foundation of China (No.60832008)National Basic Research Program of China (973 Program, No.2009CB320403)
文摘In this paper, trellis shaping is applied to reducing the Peak-to-Average Power Ratio(PAPR) of NC-OFDM signals due to the fact that the total number of active subcarriers and their locations might change continuously in a dynamic spectrum access network.A new branch metric of trellis shaping is proposed which reduces the PAPR of OFDM signals through minimizing the variance of the power by VA decoder.The overall performance considerably depends on the type of signal mapping, and therefore a new type of 64QAM mapping method is designed.Simulation results show that this scheme significantly reduces the PAPR.Finally, a significant phenomenon is demonstrated that the PAPR of NC-OFDM signals in which the deactivated carriers is distributed in the Bernoulli distribution has better performance than that of OFDM signals.
文摘Objectives To explore the intrinsic factors related to the pathogenesis of acute arterial thrombosis （AAT） and to elucidate the patho- genesis of AAT on the basis of differentially expressed genes. Methods Patients with acute myocardial infarction （AMI）, stable angina （SA） and healthy controls （n = 20 per group） were recruited, and the whole human genome microarray analysis was performed to detect the differentially expressed genes among these subjects. Results Patients with AMI had disease-specific gene expression pattern. Biological functional analysis showed the function of T cells was significantly reduced, the mitochondrial metabolism significantly decreased, the ion metabolism was abnormal, the cell apoptosis and inflammatory reaction increased, the phagocytosis elevated, the neutrophil-mediated immunity increased and the post-traumatic repair of cells and tissues increased in AMI patients. The biological function in SA group and healthy controis remained stable and was comparable. Conclusions The reduced function ofT cell gene models in AAT showed the dysfunction of the immune system. The pathogenesis of AAT may be related to the inflammatory reaction after arterial intima infection caused by potential pathogenic microorganisms.
