The repairing of damaged composite materials becomes a hot research subject in the late 1990s. In this paper a new technology of repairing composite materials is given on the basis of our previous ...research. The light wave of 675 nm transmitted by optical fiber is used as repairing light source, special repairable adhesive which can be stimulated by the light is adopted. By comparing the stiffness of the composite material before and after being damaged, it can be concluded that the mechanical property will not be changed with the feasible repairing technology.PUBLICATION ABSTRACT
In this paper a new reactive mechanism based on perception-action bionics for multi-sensory integration applied to Unmanned Aerial Vehicles (UAVs) navigation is proposed. The strategy is inspired by ...the olfactory bulb neural activity observed in rabbits subject to external stimuli. The new UAV navigation technique exploits the use of a multiscroll chaotic system which is able to be controlled in real-time towards less complex orbits, like periodic orbits or equilibrium points, considered as perceptive orbits. These are subject to real-time modifications on the basis of environment changes acquired through a Synthetic Aperture Radar (SAR) sensory system. The mathematical details of the approach are given including simulation results in a virtual environment. The results demonstrate the capability of autonomous navigation for UAV based on chaotic bionics theory in complex spatial environments.
Low light stress is one of the most important factors affecting photosynthesis and growth in winter production of cucumber (Cucumis sativus L.) in solar greenhouses in northern China. Here, two ...genotypes of cucumber (Deltastar and Jinyan 2) are used to determine the effect of low light stress on Rubisco expression and photosynthesis of leaves from emergence to senescence. During leaf development, the net photosynthetic rate (PN), stomatal conductance (gs), Rubisco initial activity and activation state, transcript levels of rbcL and rbcS, and the abundance of rbcL and rbcS DNA in these two genotypes increase rapidly to reach maximum in 10-20 d, and then decrease gradually. Meanwhile, the actual photosystem II efficiency (PSII) of cucumber leaves slowly increased in the early leaf developing stages, but it declined quickly in leaf senescent stages, accompanied by an increased non-photochemical quenching (NPQ). Moreover, PN, gs, initial Rubisco activity, and abundance of protein, mRNA and DNA of Rubisco subunits of leaves grown under 100 μmol m-2 s-1 are lower, and require more time to reach their maxima than those grown under 600 μmol m-2 s-1 during leaf development. All these results suggest that lower photosynthetic capacity of cucumber leaves from emergence to senescence under low light stress is probably due to down-regulated Rubisco gene expression in transcript and protein levels, and decreased initial and total activity as well as activation state of Rubisco. Deltastar performs better than Jinyan 2 under low light stress.
Nearby electrolyte solution may have a negative effect on the performance of UHF RFID tags. In this paper, we designed a dynamic testing system and conducted a series of experiments, investigating ...how they affect the read range of RFID tags. The main reason for the decrease of read range is that the boundary conditions near the solution surface reduce antenna gain and transmission coefficient. With the conductivity of the electrolyte solution increasing or the distance between a tag and electrolyte solution reducing, the read range of the RFID system decreases. Moreover, the simulation of maximum read range was carried out with our proposed theoretical formula. The theoretical results were found to be in good agreement with experimental data.
Background： A large proportion of the patients with papillary thyroid microcarcinoma are young women. Therefore, minimally invasive endoscopic thyroidectomy with central neck dissection （CND） emerged ...and showed well-accepted results with improved cosmetic outcome, accelerated healing, and comforting the patients. This study aimed to evaluate the safety and effectiveness of robotic total thyroidectomy with CND via bilateral axillo-breast approach （BABA）, compared with conventional open procedure in papillary thyroid microcarcinoma. Methods： One-hundred patients with papillary thyroid microcarcinoma from March 2014 to January 2015 in Jinan Military General Hospital of People＇s Liberation Army （PLA） were randomly assigned to robotic group or conventional open approach group （17 = 50 in each group）. The total operative time, estimated intraoperative blood loss, numbers of lymph node removed, visual analog scale （VAS）, postoperative hospital stay time, complications, and numerical scoring system （NSS, used to assess cosmetic effect） were analyzed. Results： The robotic total thyroidectomy with CND via BABA was successfully performed in robotic group. There were no conversion from the robotic surgeries to open or endoscopic surgery. The subclinical central lymph node metastasis rate was 35%. The mean operative time of the robotic group was longer than that of the conventional open approach group （118.8± 16.5 min vs. 90.7± 10.3 min, P 〈 0.05）. The study showed significant differences between the two groups in terms of the VASs （2.1 ± 1.0 vs. 3.8 ±~ 1.2, P 〈 0.05） and NSS （8.9 ± 0.8 vs. 4.8 ± 1.7, P 〈 0.05）. The differences between the two groups in the estimated intraoperative blood loss, postoperative hospital stay time, numbers of lymph node removed, postoperative thyroglobulin levels, and complications were not statistically significant （all P 〉 0.05）. Neither iatrogenic implantation nor metastasis occurred in punctured porous channel or chest wall in both groups. Postoperative cosmetic results were very satisfactory in the robotic group. Conclusions： Robotic total thyroidectomy with CND via BABA is safe and effective for Chinese patients with papillary thyroid microcarcinoma who worry about the neck scars.
Shape Memory Alloy (SMA) optically activated is the key technology of optical SMA activator. According to the shape memory mechanism of SMA, researches are done on the activating response time and ...light wavelength of activating source etc of SMA optically activated to approach the parameters selection of optical activation. SMA has the optimum efficiency in the range of 13 seconds to 27 seconds when SMA is illuminated continuously by wavelength of 675nm; The power of light wave has a low effect on SMA; The longer the activating wavelength, the quicker the response time of SMA activated. If the proper activating time and activating wavelength are adopted, and the structure deformation of composite material of SMA imbedded may be actively controlled, an ideal effect will be gotten. The research provides an evidence for the design of optical SMA activator and is of great significance to its application. The research on smart structure has a wide application prospect.PUBLICATION ABSTRACT
A 59-year-old man underwent liver radiofrequency ablation under laparotomy for recurrent hepatic carcinoma located in the caudate lobe,however,near-fatal bleeding occurred 1 wk after the ...operation.The intraoperative ultrasound study during laparotomy revealed left hepatic artery pseudoaneurysm.Suture and packing with ribbon gauze was used to obtain hemostasis.A secondary hemorrhage followed 11 h later and hepatic angiography was performed immediately.Bleeding from the pseudoaneurysm in a branch of the left hepatic artery was found and the artery branch was embolized with coils.Other than slight bile leakage,post-embolization continued satisfactorily.Bleeding did not reoccur.The follow up visit 1 mo later found the pseudoaneurysm disappearing and no tumor recurrence.
Background： Collapsin response mediator protein-2 （CRMP2） has been shown to be involved in ischemia/hypoxia （IH） injury. We determined whether CRMP2 modulates ischemic injury in the retinal of Ocular ...ischemic syndrome （OIS）. This study was to explore the molecular mechanisms underlying O1S in a novel mice model. Methods： Experiments were performed oil adult male C57/BL6 mice that received bilateral internal carotid arteries ligation for 1,2, or 4 weeks. The mice received injection of calpeptin group before occlusion for 4 weeks or not. The expression of CRMP2 in the retinal was exalnined by western blotting （WB） analysis and immunohistochemical analysis （IHC）. The effects of ischemic injury on retinal were evaluated by fundus examination, fundus fluorescein angiography, electroretinogram, cell cotinting of retinal ganglion cell （RGC）, and measurement of the thickness of the retina. Results： The veins dilated after chronic ischemia. In the electroretinography, the amplitudes of a- and b-waves kept diminishing in an ischemia time-dependent manner. Moreover, the tail vein-retinal circulation time prolonged in the l- and 2-week group. In comparison, thickness of the retina decreased gradually with the ischemia time elapsed. WB analysis showed the CRMP2 and p-CRMP2 levels decreased in the 2- and 4-week groups. The results of IHC analysis were compatible with our results of WB. The loss of RGCs, decrease of the total reaction time and reduction of CRMP2 was alleviated by intravitreal injection of calpeptin. Conclusions： These results revealed that bilateral ligation of the internal carotid artery causes retinal ischemia in mice. Moreover, CRMP2 might play a pivotal role during the ischemic injury in the retina and inhibit the cleavage of CRM P2 can ameliorate the IH injury.
Aim： Embryonic stem （ES） cells are being widely investigated as a promising source of hepatocytes with their proliferative, renewable, and pluripotent capacities. However, controlled and scalable ES ...cell differentiation culture into functional hepatocytes is challenging. In this study, we examined the differentiat- ing potential of embryoid-body cells derived from ES cells into hepatocytes in alginate microbeads containing exogenous growth factors in vitro. Methods： Embryoid bodies were formed from ES cells by suspension methods. Embryoid bodies cultured for 5 d were treated with trypsin-EDTA. The disaggregated cells were encapsulated in alginate microbeads and stimulated with exogenous growth factors to induce hepatic differentiation. In the course of cell differentiation, cell morphology and viability were observed, and the expression patterns of some genes of the hepatocyte were confirmed by RT-PCR. An immunofluorescence analysis revealed the expression of albumin （ALB） and cytokeratin-18 （CK18）. Hepatocyte functional assays were confirmed by the secretion of ALB and urea. Results： We showed that embryoid-body cells could maintain cell viability in alginate microbeads in vitro. We also found that directed differentiated cells expressed several hepatocyte genes including ct-fetoprotein （AFP）, ALB, Cyp7a 1, CK18, transthyretin （TTR） and tyrosine aminotransferase （TAT） and produced ALB and urea in alginate microbeads. The directed differentiated cells expressed ALB and CK18 proteins on d 14. However, embryoid-body cells could not form hepatocytes without exogenous growth factors in alginate microbeads. Conclusion： The differentiation of embryoid-body cells into hepatocytes con- taining exogenous growth factors in alginate microbeads gives rise to functional hepatocytes and may develop scalable stem cell differentiation strategies for bioartificial livers and hepatocyte transplantation.
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