Jiangsu University | Date: 2015-04-08
Jiangsu University | Date: 2015-04-30
A device and a method for laser-inducing cavitation strengthening with multi-system automatic coordination work. The device comprises a plurality of systems, including a clamping system, a lifting system, an imaging system, a computer control system, a laser system and an energy density amplifying system, etc. The device for laser-inducing cavitation strengthening comprises a laser cavitation device and a fixing platform. A water channel is formed in the fixing platform. A cushion block is equipped in the water channel. The wall of the water channel is provided with a temperature sensor. The temperature sensor is connected with a computer. The fixed platform is arranged on a lifting device. The lifting device is located on a two-axis coupling platform. The laser emitted by the laser cavitation device passes through the sidewall of the water channel to be focused in the water channel. The laser cavitation device is connected with the computer. The lifting device and the two-axis coupling platform are connected with the computer through a CNC servo system. The plurality of systems operate coordinately. The material is strengthened using the cavitation bubble generated by the laser inducing, so that the effect of prolonging the life of the material can be achieved. An operator can quickly and accurately obtain corresponding data and can quickly and efficiently strengthen such material.
Jiangsu University | Date: 2014-07-09
An adaptively positioned mitral valve closure plate blocker for repairing mitral regurgitation, comprising a suture and shaping ring (4.1) sutured on a mitral ring (2.1) and a closure plate (4.2); the closing plate (4.2) comprises a tongue-shaped plate and a strut (4.3) located at the top of the tongue-shaped plate and connected to the suture and shaping ring; the closing plate (4.2) can be connected to the suture and shaping ring (4.1), being capable of flapping back and forth and twisting left and right. The suture and shaping ring is sutured on the valve ring (2.1) of the mitral valve (2) of a patient in a thoracotomy and open heart surgery, thus shaping the disease expanded mitral ring (2.1), and supporting the closing plate (4.2); when a heart contracts and valve leaflets close, the closing plate (4.2) flaps and twists depending on the position of a regurgitation opening at the free edge of the valve leaflets to realize adaptive positioning of the closing plate (4.2), so that the closing plate (4.2) is at the free edge when two valve leaflets are closed, covering the regurgitation opening, and is tightly attached to the free edge of the valve leaflets, reducing or avoiding regurgitation of the mitral valve (2).
Jiangsu University | Date: 2014-07-11
A cutting longitudinal swaths grain harvesting and baling combine, includes a grain cutting and conveying system, a threshing and separation system, a grain cleaning apparatus, a grain collection and holding system, a straw compression and baling apparatus, a chassis travelling system, and a driving system; when the combine is harvesting grain in fields, the stalks are cut and conveyed to the threshing and separation system by the grain cutting and conveying system; the threshed and separated straw is compressed and baled by the straw compression and baling apparatus; the threshed and separated grain is cleaned by the grain cleaning apparatus; and the cleaned grain is conveyed by the grain collection and holding system to a grain storage bin. The combine can achieve harvesting of grain such as rice and wheat as well as compression and baling of threshed straw, having advantages of high working efficiency, stable performance, a simple process, and being time and labor saving.
Jiangsu University | Date: 2014-08-26
Provided is a laser shock peening method for obtaining a large-area uniform surface morphology. Using the relationship between the thickness of an absorption layer and a plastic deformation due to the laser shock peening and using a grid-shaped absorption layer (5) having a staggered distribution in thickness in cooperation with a two-layer interlaced laser shock processing method significantly reduce the height difference between micro-protrusions (10) and micro-pits (12) produced by an impact of a square light spot, and effectively reduce the roughness of the workpiece surface such that a large-area uniform surface morphology is formed on the workpiece surface.
Jiangsu University | Date: 2015-04-28
A microstructured optical fiber has periodically arranged high-index rods embedded in a low-index background, a high-index ring surrounding the high-index rods, and a high-index core located at the center. The high-index rods and the low-index background forms a microstructured cladding region which supports the guidance of supermodes. The fundamental and the highest supermodes form a cladding-mode band, wherein at least the effective index of a core mode lies in the cladding-mode band. Also provided is a technique for selectively filtering the fiber modes, to selectively filter out one or some of the high-order modes with the other modes still guided in the core with low loss. The cascade of optical fibers can filter out a group of fiber modes, marking guidance of a single high-order mode in a few-mode optical fiber possible.
Jiangsu University | Date: 2015-12-09
A testing device for integrated irrigation and disinfection includes a centrifugal pump, pressure sensors, flow sensors, an ion concentration sensor, and a control system. The testing device has comprehensive functions of fertilization, spray and drip irrigation load simulation, water and fertilizer parameter detection, fertilizer absorbing channel parameter detection and backflow channel parameter detection. The detection of nutrient ion concentration in a nutrient solution is combined with the aspects of irrigation, dynamic preparation of a nutrient solution and disinfection of a nutrient solution, to realize a high-precision dynamic preparation of a nutrient solution and irrigation area load simulation, and satisfy the requirements on a test system during a research and development process of an irrigation and fertilization system. The testing device is applicable to the research on the techniques and the development of a system for precise irrigation and accurate preparation of a nutrient solution in the field of facility agriculture.
Huang L.,Jiangsu University
Superlattices and Microstructures | Year: 2016
The barrier properties of platinum contacts to lightly and highly doped (1 × 1016 cm−3 and 1 × 1018 cm−3) 4H-SiC are investigated. The values of barrier height (BH) and ideality factor deduced from the experimental current-voltage data on the basis of thermionic emission (TE) theory for both samples are abnormally temperature dependent. The anomalies could be commented by a single Gaussian distribution (GD) of inhomogeneous BHs for the lightly doped sample, however a double Gaussianly distributed BHs for the highly doped sample. A theoretical model based on GD of inhomogeneous BHs is proposed to analyze the electrical characteristics of metal/SiC contact. The theoretical simulated characteristics are well agreement with the experimental data for the lightly doped sample. However, obvious discrepancies between the theoretical and experimental properties are observed for the highly doped sample in the low temperature range, suggesting that TE is not the dominant transport mechanism. The double GD of inhomogeneous BHs could be attributed to thermionic field emission mechanism at low temperatures. © 2016 Elsevier Ltd
Zheng W.,Jiangsu University
Mini-Reviews in Medicinal Chemistry | Year: 2013
Silent information regulator 2 (Sir2) enzymes or sirtuins are a family of evolutionarily conserved intracellular protein deacetylases that can catalyze the acetyl group removal from the specific Nε-acetyl-lysine (AcK) side chains on a variety of proteins from all kingdoms of life. Yeast Sir2 was the first sirtuin identified, and so far seven sirtuins (i.e. SIRT1-7) have been found in mammals including humans. The sirtuin-catalyzed deacetylation reaction has captured tremendous interest during the past a few years because of (i) its increasingly demonstrated importance in many crucial biological processes such as gene transcription, metabolism, and aging, and thus its therapeutic potential for metabolic and age-related diseases and cancer, and (ii) its unique deacetylation chemistry. Specifically, the sirtuin-catalyzed AcK side chain deacetylation is not merely an amide hydrolysis reaction, instead is coupled to the nicotinamide cleavage from β- nicotinamide adenine dinucleotide (β-NAD+ or NAD+) with the generation of three enzymatic products, i.e. the deacetylated protein species, nicotinamide, and 2'-O-acetyl-ADP-ribose (2'-O-AADPR). Here the author would like to review the past endeavors on developing mechanism-based sirtuin modulators (inhibitors and activators). The first part of this article will provide an updated mechanistic picture of the sirtuin-catalyzed deacetylation reaction. The second part will be focused on how the mechanistic knowledge has been exploited for the design of effective sirtuin modulators. © 2013 Bentham Science Publishers.
Wang Z.,Jiangsu University
Molecular genetics and genomics : MGG | Year: 2014
Data normalization is essential for reliable output of quantitative real-time reverse-transcription polymerase chain reaction (qRT-PCR) assays, as the unsuitable choice of reference gene(s), whose expression might be influenced by exogenous treatments in plant tissues, could cause misinterpretation of results. To date, no systematic studies on reference genes have been performed in stressed Brassica napus. In this study, we investigated the expression variations of nine candidate reference genes in 40 samples of B. napus leaves subjected to various exogenous treatments. Parallel analyses by geNorm and NormFinder revealed that optimal reference genes differed across the different sets of samples. The best-ranked reference genes were PP2A and TIP41 for salt stress, TIP41 and ACT7 for heavy metal (Cr(6+)) stress, PP2A and UBC21 for drought stress, F-box and SAND for cold stress, F-box and ZNF for salicylic acid stress, TIP41, ACT7, and PP2A for methyl jasmonate stress, TIP41 and ACT7 for abscisic acid stress, and TIP41, UBC21, and PP2A for Sclerotinia sclerotiorum stress. Two newly employed reference genes, TIP41 and PP2A, showed better performances, suggesting their suitability in multiple conditions. To further validate the suitability of the reference genes, the expression patterns of BnWRKY40 and BnMKS1 were studied in parallel. This study is the first systematic analysis of reference gene selection for qRT-PCR normalization in B. napus, an agriculturally important crop, under different stress conditions. The results will contribute toward more accurate and widespread use of qRT-PCR in gene analysis of the genus Brassica.