Search

Solar driven nitrogen (N2) fixation to synthesize ammonia is a potential alternative for the traditional Haber-Bosch approach to meeting industrial demand, but is largely hampered by the difficulties in the harvesting of solar energy and activating inert N2. In this work, hollow CeF3 nanospheres co-doped with activator Tm3+ and sensitizer Yb3+ (Yb3+:Tm3+:CeF3) were prepared by microwave hydrothermal method. The product was employed as a catalyst for photo-driven N2 fixation by adjusting the molar ratio of Ce3+:Yb3+:Tm3+. Results show that the porous hollow structure enhances the light-harvesting by physical scattering and reflection. In addition, heteroatom doping generates abundant fluorine vacancies (FV) which provide abundant active sites for adsorption and activation of N2. The sample with molar ratio of CeF3:Yb3+:Tm3+ at 178:20:2 demonstrates the highest utilization of solar energy attributed to the strongest upconversion capability of near-infrared (NIR) light to visible and ultraviolet (UV) light, and the NH4+ concentration achieves the highest value of 15.06 μmol/(gcat∙h) under simulated sunlight while nearly 6.22 μmol/(gcat∙h) under NIR light. Current study offers a promising and sustainable strategy for the fixation of atmospheric N2 using full-spectrum solar energy.

Background Long-term care (LTC) services are a professional service-driven (PSD) system; to deliver appropriate care services to residents, health care providers first need to collect appropriate patient data and make a professional assessment. A well-designed LTC information system should therefore consider the information requirements of multidisciplinary health care providers to adequately support their care services. Objectives This study proposed a modified service blueprint—the PSD service blueprint—for visualizing interdisciplinary service providers' input and output information requirements, which correspond to their service activities. Methods The PSD service blueprint comprises five layers and seven elements. We also present a case study to illustrate the blueprint's application to daily LTC services. Results Our proposed approach could clearly illustrate the daily care activities, service providers (main actors), actors' input and output information, and suggestions for LTC information system–related applications. Conclusion The proposed PSD service blueprint can not only gather interdisciplinary LTC service providers' information system requirements but also act as a mapping tool for visualizing the care service process.

BACKGROUND Down syndrome (DS) is one of the most common chromosomal aneuploidy diseases. Prenatal screening and diagnostic tests can aid the early diagnosis, appropriate management of these fetuses, and give parents an informed choice about whether or not to terminate a pregnancy. In recent years, investigations have been conducted to achieve a high detection rate (DR) and reduce the false positive rate (FPR). Hospitals have accumulated large numbers of screened cases. However, artificial intelligence methods are rarely used in the risk assessment of prenatal screening for DS. AIM To use a support vector machine algorithm, classification and regression tree algorithm, and AdaBoost algorithm in machine learning for modeling and analysis of prenatal DS screening. METHODS The dataset was from the Center for Prenatal Diagnosis at the First Hospital of Jilin University. We designed and developed intelligent algorithms based on the synthetic minority over-sampling technique (SMOTE)-Tomek and adaptive synthetic sampling over-sampling techniques to preprocess the dataset of prenatal screening information. The machine learning model was then established. Finally, the feasibility of artificial intelligence algorithms in DS screening evaluation is discussed. RESULTS The database contained 31 DS diagnosed cases, accounting for 0.03% of all patients. The dataset showed a large difference between the numbers of DS affected and non-affected cases. A combination of over-sampling and under-sampling techniques can greatly increase the performance of the algorithm at processing non-balanced datasets. As the number of iterations increases, the combination of the classification and regression tree algorithm and the SMOTE-Tomek over-sampling technique can obtain a high DR while keeping the FPR to a minimum. CONCLUSION The support vector machine algorithm and the classification and regression tree algorithm achieved good results on the DS screening dataset. When the T21 risk cutoff value was set to 270, machine learning methods had a higher DR and a lower FPR than statistical methods.

Background The pandemic of SARS-CoV-2 (COVID-19), which began in December 2019, spread mostly from person to person through respiratory droplets. A recommendation was issued to postpone all elective surgical practices. However, some confirmed or suspected COVID-19 patients required life-saving emergent surgeries. Methods To facilitate emergent surgical interventions for these patients, we have reviewed the current literature and established an algorithm of precautions to be taken by operating room team members during the COVID-19 pandemic. Results The initial algorithm of preparation for surgical intervention during the COVID-19 pandemic was relatively simple. However, the abrupt increase of confirmed COVID-19 cases due to returned overseas travelers since mid-March 2020 disrupted the routine hospital clinical service. Due to the large number of febrile patients, the algorithm was therefore revised according to travel history, occupation, contact and cluster history (TOCC), unexplained fever/symptoms, and emergent/nonemergent surgery. TOCC (+) patients presenting with otherwise unexplained fever/symptoms would be regarded as belonging to the fifth category of "severe special infectious pneumonia." If the patient requires emergent surgery to relieve the non-life-threatening disorders, two times of negative COVID-19 tests are necessary before the operation is approved. For life-threatening situations without two negative results of COVID-19 tests, the operation schedule should be approved by the Chairman of Surgery Management Committee. Conclusion The application of a clear and integrated algorithm for operating room team members aids in effective personal protective equipment facilitation to keep both healthcare providers and patients safe as well as to prevent hospital-based transmission of COVID-19.

Calorie-dense starchy thickeners (CDSTs) are preferable for dysphagic individuals while in terms of both sufficient moisture and energy intake. In the present study, we evaluated the thickening and anti-sedimentation effects of five commercial CDSTs and pre-screened the best candidate of germ rice (GR) powder for further formulation with xanthan and guar gums (XG and GG). The formulated model food matrices (MFMs) with different concentrations of CDST were prepared: nectar-like, honey-like, and pudding-like defined as 200 ± 50 mPa·s, 1050 ± 50 mPa·s, and 1800 ± 50 mPa·s, respectively. These CDST-MFMs were also subjected to evaluations of their physicochemical properties and stability. The solubility of MFMs containing GR could be as high as 60.95%; whereas the oil binding capabilities ranged between 3.77 and 4.22%, which were significantly higher (p

Objective To indigenize the median of Down syndrome (DS) screening markers for first and second trimester, and compare the impact of the indigenized and built-in median data on the efficiency of DS screening. Materials and Methods Data derived from first and Second-trimester screening (FTS and STS) for DS, composed of selected pregnancies deemed to be normal, were examined in a retrospective study. Indigenization regression analysis was calculated by using five models to fit statistical the raw data. Multiple of median (MoM) values estimated by using indigenized medians were compared with those calculated by using built-in. Results This study established a regression equation which is more suitable for the median of each screening marker in the local pregnant women. The changes of median MoM of screening markers were statistically significant after indigenization. For FTS, the detection rate was 100% when the false positive rate was 5%, and the cut-off value was 1/262. On the other hand, for STS, the detection rate of the model with indigenized parameters was 77.42%, which is 16.13% higher than that of built-in parameters. Conclusion For the individual specific risk of pregnancy, when the indigenized parameters was used to calculate, is more accurately and screening effectiveness has been improved. This is a great reference significance for the current prenatal screening whether indigenized data should be used.

Defective crystalline semiconductor plays a significant role in photocatalytic nitrogen fixation, however the rapid recombination of photoexcited electron/hole pairs largely reduces the efficiency. Spontaneous polarization of the nonlinear optical (NLO) material has emerged as a promising strategy for addressing the problem. Herein, a defects-rich NLO crystalline LiNbO3 modulated by natural nano-mineral palygorskite (LiNbO3/Pal) has been synthesized via sol–gel method. The intrinsic polarization of LiNbO3/Pal is investigated by second harmonic generation (SHG) measurements, which indicates an intensity of about 3.1 times that of typical NLO material KH2PO4 (KDP). The strong polarization can facilitate the separation of photogenerated charge carriers in the bulk phase and on the surface of LiNbO3/Pal. The existence of oxygen vacancies in LiNbO3/Pal may originate from doping of metal ions and active groups on the surface of Pal during crystallization of LiNbO3, which shortens the bandgap of LiNbO3 and facilitates the absorption and activation of N2 molecules. As a result, the polarization effect and rich oxygen vacancies make the LiNbO3/Pal an exceptional photocatalyst for N2 fixation. The 40 wt% LiNbO3/Pal composite achieves an average rate of photocatalytic NH4+ production of 52.57 μmol gcat−1 h−1 under simulated solar light, which is about sixfold higher than that of bulk LiNbO3. This work not only presents a new perspective on mineral modification of NLO material but also offers a cost-effective photocatalyst for nitrogen fixation.

Photocatalytic fixation of nitrogen has been recognized as a green and promising strategy for ammonia synthesis under ambient conditions. However, the efficient reduction of nitrogen remains a challenge due to high activation energy of nitrogen and low utilization of solar energy. Herein, lanthanum oxyfluoride with different doping content of Pr3+ (LaOF:xPr3+) upconversion nanorods were synthesized by microwave hydrothermal method. Results indicated that the doping of Pr3+ generated considerable defects on the surface of LaOF which acted as the adsorption and activation center for nitrogen. Meanwhile, the Pr3+ ion narrowed the band gap and broadened the light response range of LaOF because LaOF:Pr3+ can upconvert visible light into ultraviolet light, which excite LaOF nanorods and improve the utilization of solar light. The doping amount of Pr3+ had critical effect on the photocatalytic nitrogen fixation performance which reached as high as 180 μmol·L−1·ho1 when the molar ratio of Pr3+ to LaOF was optimized to be 2%.

Stress-induced neuroepigenetic programming gains growing more and more interest in the studies of the etiology of posttraumatic stress disorder (PTSD). However, seldom attention is focused on DNA demethylation in fear memory generalization, which is the core characteristic of PTSD. Here, we show that ten-eleven translocation protein 3 (TET3), the most abundant DNA demethylation enzyme of the TET family in neurons, senses environmental stress and bridges neuroplasticity with behavioral adaptation during fear generalization. Foot shock strength dependently induces fear generalization and TET3 expression in nucleus accumbens (NAc) in mice. Inhibition of DNA demethylation by infusing demethyltransferase inhibitors or AAV-Tet3-shRNA virus in NAc enhances the fear generalization and anxiety-like behavior. Furthermore, TET3 knockdown impairs the dendritic spine density, PSD length, and thickness of neurons, decreases DNA hydroxymethylation (5hmC), reduces the expression of synaptic plasticity-related genes including Homer1, Cdkn1a, Cdh8, Vamp8, Reln, Bdnf, while surprisingly increases immune-related genes Stat1, B2m, H2-Q7, H2-M2, C3, Cd68 shown by RNA-seq. Notably, knockdown of TET3 in NAc activates microglia and CD39-P2Y12R signaling pathway, and inhibition of CD39 reverses the effects of TET3 knockdown on the fear memory generalization and anxiety. Overexpression of TET3 by Crispr-dSaCas9 virus delivery to activate endogenous Tet3 in NAc increases dendritic spine density of neurons in NAc and reverses fear memory generalization and anxiety-like behavior in mice. These results suggest that TET3 modulates fear generalization and anxiety via regulating synaptic plasticity and CD39 signaling pathway.

Developing cost-effective photocatalyst which converts nitrogen to ammonia under mild conditions remains a great challenge from both academic and industrial perspective. In this work, we synthesize one dimensional attapulgite (ATP) mineral supported Pr3+:CeF3 nanocomposite by a microwave hydrothermal method. Results indicate that adequate doping of Pr3+ facilitates the conversion of visible light into ultraviolet light which expands the adsorption range of solar energy. The abundant fluorine vacancies which generate from the incorporation of partial metal ions of ATP into the crystal lattice of CeF3 act as active sites promoting the adsorption of N2 as well as weakening the N ≡ N triple bond in the photocatalysis reaction. The 40 wt% loading of Pr3+:CeF3 exhibits the highest photocatalytic nitrogen fixation performance attributed to the formation of Z-scheme structure which not only improves the separation of photoexcited charge carriers, but also preserve the high redox potential to reduce nitrogen. This work provides a sustainable way for nitrogen fixation using solar energy based on natural mineral and beyond.

Gouty arthritis (GA) is a multifactorial disease whose pathogenesis is utterly complex, and the current clinical treatment methods cannot wholly prevent GA development. Western medicine is the primary treatment strategy for gouty arthritis, but it owns an unfavorable prognosis. Therefore, the prevention and treatment of GA are essential. In China, traditional Chinese medicine (TCM) has been adopted for GA prevention and treatment for thousands of years. Gout patients are usually treated with TCM according to their different conditions, and long-term results can be achieved by improving their physical condition. And TCM has been proved to be an effective method to treat gout in modern China. Nevertheless, the pharmacological mechanism of TCM for gout is still unclear, which limits its spread. The theory of prevention and treatment of gout with TCM is more well acknowledged in China than in abroad. In this article, Chinese herbs and ancient formula for gout were summarized first. A total of more than 570 studies published from 2004 to June 2021 in PubMed, Medline, CNKI, VIP, Web of Science databases and Chinese Pharmacopoeia and traditional Chinese books were searched; the current status of TCM in the treatment of GA was summarized from the following aspects: articular chondrocyte apoptosis inhibition, antioxidative stress response, inflammatory cytokine levels regulation, uric acid excretion promotion, immune function regulation, uric acid reduction, and intestinal flora improvement in subjects with gout. The literature review concluded that TCM has a specific curative effect on the prevention and treatment of GA, particularly when combined with modern medical approaches. However, lacking a uniform definition of GA syndrome differentiation and the support of evidence-based medicine in clinical practice have provoked considerable concern in previous studies, which needs to be addressed in future research.

Osteoarthritis(OA) is a common clinical disease. The incidence of OA increases significantly with age, and the quality of life of patients is seriously affected. In the pathogenesis of OA, cartilage degeneration is the main cause. There are many long non-coding RNA (lncRNA) specifically expressed in osteoarthritis, which is closely related to the occurrence and development of osteoarthritis. Based on the latest research from 2014 to 2019, this paper summarizes the differential expression of lncRNA in osteoarthritis, the mechanism of lncRNA regulating chondrocyte function, and the mechanism of lncRNA regulating cartilage matrix metabolism. The fact that the expression of lncRNA is altered at different stages of OA development indicates that lncRNA can be developed forlife. The biomarkers and therapeutic targets can provide reference for the prevention, treatment and research of osteoarthritis.

Removal of hazardous NO at low temperature via photo-assisted selective catalytic reduction (photo-SCR) strategy is promising, however fully harvesting of solar energy and achieving high SO

Based on value engineering, the cost and function of human resource are analyzed in this paper. Then, the paper puts forward the measurement model of human resource integrating costs and corresponding function, i.e. comparing the cost with the discounted return of corporation and the weight of particular kinds of human resource in a specific year. In addition, several approaches to the enhancement of the efficiency of H&R investment are discussed.

A high spectral resolution lidar (HSRL) system based on injection-seeded Nd:YAG laser and iodine absorption filter has been developed for the quantitative measurement of aerosol and cloud. The laser frequency is stabilized at 80 MHz by a frequency locking system and the absorption line of iodine cell is selected at the 1111 line with 2 GHz width. The observations show that the HSRL can provide vertical profiles of particle extinction coefficient, backscattering coefficient and lidar ratio for cloud and aerosol up to 12 km altitude, simultaneously. For the measured cases, the lidar ratios are 10~20 sr for cloud, 28~37 sr for dust, and 58~70 sr for urban pollution aerosol. It reveals the potential of HSRL to distinguish the type of aerosol and cloud. Time series measurements are given and demonstrate that the HSRL has ability to continuously observe the aerosol and cloud for day and night.

Removal of hazardous NO at low temperature via photo-assisted selective catalytic reduction (photo-SCR) strategy is promising, however fully harvesting of solar energy and achieving high SO2/H2O tolerance still remain a challenge. Herein, the phosphoric acid modified natural attapulgite(P-ATP) was employed as a matrix to immobilize CeVO4 by microwave hydrothermal method. Results show that P-ATP provides abundant active sites facilitating the in situ grow of CeVO4 nanorods on its surface which hierarchically construct a dendritic-like photocatalyst. The near-infrared (NIR) light is upconverted to visible and UV light through CeVO4 which not only broaden the absorption range of solar light, but also build Z-scheme heterostructure with P-ATP enhancing the redox potential of charge carriers. The CeVO4/P-ATP nanocomposite can reach as high as 92 % for NO conversion under full-spectrum solar irradiation, while retaining nearly 60 % conversion under NIR light. Moreover, the catalyst exhibits outstanding tolerance with SO2 and H2O due to the presence of Ce species which can prevent NH3 from being sulfated, while ATP prevent catalyst from being corroded by H2O. This work may open up a new window for full-spectrum driven SCR of NO based on cost-effective mineral catalyst.

The accuracy of visibility measurement from night light sources image is usually affected by the circumstance light and noise. This paper presents an auto-layering wavelet transfer method to remove the circumstance effect and noise simultaneously. Firstly, the light propagation through the fog at night condition is formulized, where the model and features of night image with circumstance effect and noise is given. Secondly, we propose to use multi-scale features of wavelet transfer to decompose the image to remove the circumstance effect and noise, where an auto-layering method is used based on the energy ratio of wavelet coefficients. Experiments show that our method is able to remove the circumstance effect and noise simultaneously and to adjust the decomposed layering number automatically. Our method is not only suitable for many wavelet functions, but also preserves the light sources as well as their glows in the digital images. The relative error of using db4 is 3.16%, and the relative error of using sym2 is 2.02%.

Accurately achieve the luminance of light sources at night images is significantly important to vision-based night visibility estimation. In this paper, we propose a practical night visibility algorithm. This algorithm contains two main parts, light sources recognition and edge extraction. Firstly, we give the model of vision-based visibility estimation, and propose the framework of algorithm. Secondly, we give the method to extract light sources from multiple potential targets by the prior knowledge of space information. Then, we analysis the features of light source image, and explain the expanded temple to cut sub-image of light source, and induce in PS level set to segment the edge. Experiments show that, the light source average recognition precision is approach to 0.95 at the condition of moderate breeze, and compared with the manual segment, the precision of light source segment is approach to 0.99 at the condition of real visibility larger than 500m.

Explosive welding is an efficient method for metals welding. However, in explosive welding, the shock wave generated by the explosion can not only damage the sensitive structure in the area of the process, but also can actually destroy a welded joint immediately after its creation. By placing an additional structure (anvil) can reduce the influence of shock waves. The influence of different anvil on the explosive welding of aluminum and magnesium plates has been investigated by using AUTODYN Software in this paper. The results show that the steel anvil is much more appropriate than sand and magnesium.

In this paper, the measurement conditions of heavy metal enriched on the filter membrane using X-ray fluorescence were talked about. According to the heavy metal enriched on the film, the specific parameters were analysed. Through many experiments, the suitable parameters were decided. In order to excite mainly heavy metal in air, the excitation voltage should be not less than 30kV. The excitation current should be between 20μA and 60μA. The measured distance should be between 4mm and 15mm. The best choice of pulse shaping time is around 6.4μs. These parameters setting should have very good application value in air heavy metal measurement.

Research on measuring night visibility using digital images mainly focused on low visibility conditions nowadays. Also, the long term observation leads to fluctuations of the single light source, which would undermine the measuring range and precision. In this context, this paper presents the dual light sources measurement method to eliminate the fluctuations of single source and to achieve both high measuring range and precision at night conditions. The source of visibility measuring error is firstly formulated through an error analysis. Then we propose a dual light sources framework that yields two identical beams to measure the visibility, which is advantageous over the single light source method and capable of measuring high visibility. In the experiments, the stability of the dual light sources is firstly tested by a 72-hour running. The average luminance ration of dual light sources is 0.9932 and the average relative error is 0.04%. The relative error of dual light sources luminance ration is only 0.2% when the fluctuations of single source is as high as 2.28%. Then the dual light sources is applied in the digital image night visibility measuring system to evaluate its validity. The result shows that the dual light sources method is capable of measuring the range of 390 times of baseline (40m baseline) with the error less than 15%, which fully meets the meteorological demands.

Background: The shortage of professional nurses is a global issue of critical importance. Improving the retention and recruitment of nurses is necessary to reduce this shortage. The ability to measure the quality of work life (QWL) of nurses is important to understand the current QWL status among nurses and to develop appropriate improvement strategies. The two instruments that are currently used in Taiwan both require excessive amounts of time to complete. Furthermore, the results that these two instruments generate are not easily interdisciplinary and international comparisons. Purpose: The aims of this study were to translate into Chinese the English version of the Work-Related Quality of Life Scale (WRQoL) that was developed by Van Laar, Edwards, and Easton (2007) and then to determine the reliability and validity of this Chinese-version scale in terms of measuring the QWL of nurses in Taiwan. Methods: The WRQoL was translated from English into Chinese using forward-translation with group discussions, back-translation, and verification of conceptual equivalence. Concurrent validity, test-retest reliability, and internal consistency reliability were determined in two samples of nurses (n = 30 and n = 213 for Phases 1 and 2, respectively) from a medical center in Taiwan during September 2009. Results: The 23-item Taiwanese version of the WRQoL showed satisfactory concurrent validity with a Taiwanese QWL scale (correlation = .75). The 3-week test-retest reliability was .89, and the Cronbach's alpha was .88, indicating high internal consistency reliability. Conclusions/Implications for Practice: The Taiwanese version of the WRQoL is acceptable for measuring the QWL of nurses in Taiwan. Larger scale studies are recommended for confirmatory factor analysis. This tool may be used for human resources management and policy-making applications, providing the potential to help retain and recruit nurses in Taiwan. Furthermore, the Taiwanese-version scale may be used to compare work-related quality of life between Taiwanese nurses and their counterparts overseas.

A numerical simulation approach is used to study the deformation and temperature distribution of W/Cu powders under shock compaction. A two-dimensional micromechanical model is employed where only a few particles are considered. The simulation is performed using plane strain element and Lagrange formulation. Shock compaction is achieved by bringing in the W/Cu powders an intense compression wave using a high-velocity rigid wall. The effects of compact velocity, particle size and friction on the particle deformation and temperature distribution are discussed based on the results of simulations. The study provides a detailed understanding of the micromechanical behavior of metal powders during shock compaction process.

In this paper, we present a numerical method to simulate the hypervelocity launcher (HVL) experiment in which the two-stage light-gas gun impact launches flyers to hypervelocity. HVL is a complex process in numerical simulation, which includes multi-materials, multi-interfaces, huge distortion, high densities and severe shock wave problems, etc. A two-step Euler high-resolution finite volume scheme is used to solve the multi-fluid hydrodynamic equations. The first step is the Lagrange step in which the computation cells are distorted to follow the material motion, and the second step is the Remap step where the distorted cells are mapped back to the Euler meshes. Based on the Volume of Fluids model (VOF) and parabolic piecewise method (PPM), a shock wave physics code named multi-fluid parabolic piecewise method (MFPPM) is developed to simulate the experimental configuration of the hypervelocity launchers and the resolution of the algorithm is also tested. We emphasize the distinguished features of the code that aid in understanding the sensitivity of hypervelocity launcher calculations to the numerical methodology. The MFPPM code is verified and validated by simulating a series of hypervelocity launcher experiments implemented in Sandia National Laboratories. Good agreements are shown when comparing the numerical results with experimental data. Besides, in our National Key Laboratory for Shock Wave and Detonation Physics Research, two new models of the high/low density (Tantalu m/ Titanium) flyer plates HVL experiment are simulated by the code. Again, the numerical results and experimental data agree well with each other.

Traditional endoscopic thoracic sympathicotomy is usually performed through an axillary incision with 5-mm thoracoscope under general anesthesia with endotrachea intubation. Nonintubated transareolar single-port thoracic sympathicotomy with a needle scope has rarely been attempted. The objective of this study is to evaluate the feasibility and safety of this minimally invasive technique in managing primary palmar hyperhidrosis (PPH). From May 2012 to May 2014, a total of 85 male patients with severe PPH underwent transareolar single-port thoracic sympathicotomy by use of a 2-mm needle scope under total intravenous anesthesia without endotrachea intubation. All procedures were successfully performed with a mean operating time of 13.5 min. The palms of all patients became dry and warm as soon as the sympathetic chain was cut off. There were no sore throat, and all the patients regained consciousness rapidly after surgery. Eighty-two patients (96.5 %) were discharged from the hospital on the first postoperative day. The postoperative complications were minor, and no patients developed Horner’s syndrome. At 6 months postoperatively, there is no obvious surgical scar on the chest wall, and none of the patients complained about postoperative pain. Compensatory sweating appeared in 31 patients. No recurrent symptoms were observed in our study. One-year follow-up revealed an excellent cosmetic result and degree of satisfaction. Nonintubated transareolar single-port needlescopic thoracic sympathicotomy is a safe, effective and minimally invasive therapeutic procedure, which can be performed in routine clinical practice for male PPH patients.

In the present paper, we propose a novel night visibility inversion algorithm. The key idea is based on the curve evolution theory in the context of dual light sources. First, we describe the features of the dual light sources night visibility inversion method, and explain the relationship between fluctuation of light source intensity and curve evolution with the special characters. Then, level set method is introduced ito define the light source intensity and establish the model with visibility inversion, and the algorithm formula is detailed. Experiments results show that, the algorithm is characterized with a strong robustness and compared with the standard visibility, the correlation of visibility result reaches up to 0.98 in the range of 2,000 meter to 12,000 me- ter, which can be used in the visibility monitoring with a large range, high precision and strong robustness.

Haze, rain and snow bring a lot of inconvenience in our daily life, especially produce serious potential safety hazard for night transport. In the present paper the authors propose the vision-based dual light sources visibility method to estimate night visibility. This method is significantly advantaged with wide range, high precision and low cost, and has a good robustness in many kinds of weather conditions. Firstly, the authors give the basic visibility estimation model under the atmosphere multiple scattering theory. Secondly, the authors propose the dual light sources method to remove the luminance fluctuations of light sources and the atmosphere light effect, and formulize the algorithm to accurately gain information of light sources from the dual light sources image. At last, the authors design the dual light sources system and conduct a long time experiments under various atmosphere conditions. The experiments show that, with the baseline of 35 m, the visibility range is up to 15 000 m, and relative error is below 20%. This method and system can satisfy the demand of meteorological department and transport agency.

Larvae homozygous for the recessive lethal allele without children(rgl) (woc(rgl)) fail to pupariate. Application of exogenous 20-hydroxyecdysone elicits puparium formation and pupation. Ecdysteroid titer measurements on mutant larvae show an endocrine deficiency in the brain-ring gland complex, which normally synthesizes ecdysone, resulting in a failure of the larvae to achieve a threshold whole body hormone titer necessary for molting. Ultrastructural investigation revealed extensive degeneration of the prothoracic cells of the ring gland in older larvae. The woc gene, located in polytene chromosomal region 97F, consists of 11 exons. A 6.8-kb transcript is expressed throughout development but is absent in the mutant woc(rgl) larvae. The woc gene encodes a protein of 187 kDa. Eight zinc fingers of the C2-C2 type point to a possible function as a transcription factor. The woc protein shows considerable homology to human proteins which have been implicated in both mental retardation and a leukemia/lymphoma syndrome.

The degeneration of the prothoracic glands of Manduca sexta during pupal-adult metamorphosis was analyzed by both light and transmission electron microscopy, and correlated with a functional analysis of the ability of the prothoracic glands to synthesize ecdysteroids in vitro. Apoptosis of degenerating glandular cells was also examined by in situ indirect immunofluorescein detection of digoxigenin-labeled genomic DNA cleavage (the TUNEL method). The ability of the prothoracic gland to synthesize ecdysteroids reached a peak 4 days after pupation, decreased drastically on day 6 and then decreased further to the basal level 2 days later. Prothoracic gland degeneration was initiated on day 6 and was characterized by nuclear condensation, cytoplasmic budding, giant autophagic vacuoles, the disappearance of the smooth endoplasmic reticulum and intercellular channels, and the fragmentation of the cytoplasm into membrane-bound bodies. The cell debris of these degenerating cells was then engulfed by numerous phagocytic hemocytes. The results of the analysis of apoptosis by immunofluorescence detection are in complete accord with the histological, ultrastructural and radioimmunoassay data, suggesting that apoptosis is the basic mechanism for programmed cell death of the cells comprising these vital glands.

Summary A monoclonal antibody against a synthetic pentadecapeptide corresponding to the N-terminal end of Bombyx-prothoracicotropic hormone (PTTH: 1–15) and a monoclonal antibody against a synthetic decapeptide corresponding to the N-terminal portion of the A-chain of bombyxin-1, bombyxin (1–10), were used as parallel probes to localize both molecules at the cellular and subcellular levels in the brain-retrocerebral complex of Manduca sexta. Immunohistochemical analysis revealed that molecules immunochemically similar to Bombyx-PTTH were localized in the cytoplasm of two pairs of dorso-lateral neurosecretory cells (L-NSC III) and could be traced along their axons to the corpora cardiaca (CC) and corpora allata (CA), whereas bombyxin-like material was absent from these cells and was detected only in the cytoplasm of four pairs of median neurosecretory cells (M-NSCs). Immunocytochemical labelling at the ultrastructural level using the PTTH antibody showed high specificity with the 5 nm immunogold particles ...

To observe the short-term therapeutic effects of Herbert screw fixation on type Mason II, Ill radial head fractures.From March 2008 to July 2010,15 patients with Mason II, III radial head fractures were treated by open reduction and Herbert screw fixation including 6 males and 9 females with the mean age of 32 years (from 18 to 55). Seven cases were left and 8 cases were right. The interval from injury to hospitalization ranged from 3 to 10 hours. The clinical symptoms were swelling, pain, restricted movement in elbow. Bonycrepitus were heard on the elbow joint and X-ray film showed radial head fractures. Mayo elbow scoring system was used to evaluate recovery of elbow function.All the incisions primarily healed without myositis ossificans. All the patients were followed up for 6 to 15 months. According to Mayo elbow score, the result was excellent in 8 cases, good in 5 cases and fair in 2 cases. Mayo score was (86.67+/-1.26) points, which including pain (53.33+/-9.76), joint function(27.33+/-4.58), joint stability(6.00+/-2.07) elbow joint mobility was 70 degrees-130 degrees with the average of (105+/-10) degrees, forearm rotation was 1000-1300 with the average of (120+/-16) degrees.Treatment of Mason II, II radial head fractures with Herbert screw fixation has advantages of satisfactory reduction, reliable fixation,easy operating and early movement of joint.

With the increasingly fierce market competition, enterprise pay more and more attention on customer relationship management. Customer loyalty, can effectively enhance the competitiveness of enterprises. This paper describes the research model of customer loyalty, and with the findings of the insurance companies, the formation of customer loyalty, impact factor and enhance programs is discussed in detail. Adopt empirical methods, such as the questionnaire survey to collect data, factor analysis to identify variables, a regression model. Explore notable influence on customer loyalty respectively for the different drive variables. The paper not only innovated the theory of customer loyalty, but also to have innovated instruction value for business practices.

The purpose of the study was to examine the effects of granulocyte-macrophage colony-stimulating factor (GM-CSF) and interleukin 4 (IL-4) on the bone-marrow-derived human adult mesenchymal stem cells (hMSCs).The hMSCs were isolated and cultured with GM-CSF and IL-4 for a period of one month. A single colony of transformed cells was then isolated and their phenotype was characterized by morphology, surface marker expression, and in vivo tumorigenesis.After one month culture, the transformed mesenchymal cells exhibited the morphology and phenotype similar to those of tumor cells, and also caused multiple fast growing lung deposits when it was injected into immunodeficient mice.Cytokines-driven malignant transformation of hMSCs may be a useful model for studying signaling pathways initiating malignant transformation of hMSC.

Dynamic signature reconfiguration is proposed to combat with eavesdroppers to enhance confidentiality over multi-rate optical code-division multiple-access (OCDMA) networks. The code reconfiguration is achieved by exclusively assigning to each network user a set of orthogonal or pseudo-orthogonal codes and randomly selecting one among them to represent each user's signature. A central node station is assumed to monitor network traffic condition and to signal transceiver coder-decoder pair to perform signature codes changing. We illustrate the confidentiality enhancement by dynamically reconfiguring user signatures using prime-lengths M-sequence codes. When the set of signature codes increases and the eavesdropper's codes detection becomes more difficult, thus network confidentiality is significantly increased.

Whether a business can make swift reaction to various markets needs become a crucial factor to gain excessive profit in intensive competition of speed economy. This article analyses the influences of speed economy cost system such as: normal and standardized cost system are not suitable for the calculation of individualized products. Cost information offered by traditional cost calculation method can not reflects the cost structure of individualized product under speed economy. The traditional cost control system concentrated on "cost maintain" is hardly to meet the need of cost control on the whole life cycle of products. Consequently, the paper puts forward the following suggestions: form dynamic cost calculation model based on the analysis of "activity chain & value chain". Establish collection system of cost information to restore the real fact of cost; set up bi-track cost control system facing small-sized manufacturing units.

Bone tissure engineering plays an important role in tissure engineering. It typically uses an osteoblasts, artificial extracellular matrix (scaffold), and osteoinductive factors which promote cell attachment, differentiation, and mineralized bone formation. So it contents three problems at least: osteoblasts culture in vivo and in vitro, scaffold studies and regulation factors. Bone defect caused by trauma, tumor and inflammation is a frequent and formidable problem in clinical orthopedics. It appears that artificial bone produced by bone tissure engineering can save the problem well. With the development of tissue engineering, bone tissue engineering is developing rapidly. However, seldom experiments are on human body, and fewer productions of bone tissure engineering are used in clinic.

Summary Ecdysteroid localization in target tissues of Drosophila melanogaster was demonstrated by the utilization of low temperature autoradiography and immunohistochemistry. Autoradiographic studies utilized high specific activity [3H]ponasterone A, an ecdysteroid with exceptional molting hormone activity in Drosophila. The data revealed a selective nuclear concentration of the labelled ligand in cells of the salivary gland, corpus allatum (source of juvenile hormone), prothoracic gland (source of ecdysone) and the central nervous system. Nuclear localization was also observed in epithelial cells of the esophagus and muscle cells of the pharynx and mandibles, etc. The specific labelling of cell nuclei was prevented by incubation of the tissue with [3H]ponasterone A in the presence of excess unlabelled ponasterone A. Nuclear localization of ponasterone A in the salivary gland was also observed when using an antiserum against ecdysteroids and an avidin-biotin-complex (ABC) detection system. The staining sh...

The degeneration of the prothoracic glands of Drosophila melanogaster during pupal-adult metamorphosis was analyzed by light microscopy, scanning, and transmission electron microscopy. The ultrastructural observations were correlated with the ability of the ring gland to synthesize ecdysteroids in vitro. The ring gland is prominent during larval life and is identifiable until just before adult eclosion but undergoes dramatic changes in location, shape, size, ultrastructure, and function during pupal-adult development. Prothoracic gland degeneration is characterized by: a gradual decrease in its ability to synthesize ecdysteroids; a decreasing quantity of smooth endoplasmic reticulum (SER) and mitochondria; the absence of intercellular channels; cytoplasmic fragmentation; and the separation of the prothoracic gland from the corpus allatum and corpus cardiacum. An ultrastructural analysis of the corpus allatum during larval-pupal-adult metamorphosis and adult life was also correlated with function, i.e., juvenile hormone biosynthesis, using a radiochemical assay of ring glands and adult corpora allata in vitro. A relatively high concentration of SER, mitochondria, and mitochondrion-scalariform junction complexes are typical features of an active corpus allatum cell. The migration of the corpus allatum from the ring gland to its position as a separate gland in the adult fly was studied in detail. The capacity of the corpus allatum to synthesize juvenile hormone is at its peak in the ring gland of the early wandering third instar larva, whereas the corpus allatum of 2-day-old female adults displayed the greatest synthetic activity during adult life. The physiological significance of the alterations in gland activity is discussed.

To investigate the effect of the immunosuppressant Tacrolimus (FK506) on the osteoblastic differentiation and in vivo osteogenic inducement of bone marrow-derived mesenchymal stem cells (MSCs).MSCs were derived from Fischer 344 rats. Some MSCs were cultured with L-ascorbic acid-2-phosphate (AsAP) and beta-glycerophosphate (beta-GP) or FK506 plus AsAP and beta-GP. The alkaline phosphatase (APase) activity and calcium deposition were detected 4, 8, 12, and 16 days after the culture. Scanning electron microscopy was used to examine the calcified nodules. Northern blotting was used to detect the mRNA expression of osteocalcium. Multiparous beta-tricalcium phosphate (beta-TCP) ceramic cubes were dipped into 2 kinds of suspension of MSCs, treated by FK506 + AsAP + beta-GP or AsAP + beta-GP, so as to produce 48 pieces of MSCs/beta-TCP complex that were randomly divided into 2 equal groups to be cultured with AsAP + beta-GP or AsAP + beta-GP + FK506 for 4 weeks. The these pieces were transplanted into the subcutaneous sites of the rats' backs and were taken out 4 and 8 weeks later respectively for histological examination.In vitro assays showed that the APase activity, calcium deposition, expression of osteocalcin mRNA of the FK506 + AsAP + beta-GP group at any time points were all significantly higher than those of the AsAP + beta-GP group (all P0.05). SEM showed that since the 16th day after culture calcified nodules began to be seen in the FK506 + AsAP + beta-GP group. Since the 4th weeks after transplantation remarkable new bone formation could be seen in the FK506 treated MSCs/beta-TCP complexes in comparison with those MSCs/beta-TCP complexes without treatment with FK506.Greatly enhancing the in vitro osteoblastic differentiation and in vivo osteogenesis of MSCs, FK506 has a potential value as a bone growth factor and may improve the clinical result of bone transplantation used to treat large bone defect. The results of this experiment also contributes to a better understanding on the mechanism of immunosuppressants.

Gender and sex role stereotyping are recognized as having the potential to limit the professional development of males within the nursing profession. The purpose of this study was to understand the relationships between demographic data and the dimensions of role stress, organizational commitment, and intentions to quit among male nurses in southern Taiwan. Research also investigated the correlations with three dependent variables and identified best predictors of male nurse intentions to quit the nursing profession. A total of 91 male nurses volunteered to participate in this cross-sectional research. Research results were based on data collected from questionnaires sent by mail to participants. A total of 76 valid questionnaires were returned and used in analysis (response rate = 83.5%). Findings pointed to patients, colleagues and society as the major sources of role stress for male nurses. These sources of stress, and the resultant intention to quit on the part of male nurses, are due in significant part to the widespread stereotyping of the profession of nursing as a "woman's occupation". Such stress pressures male nurses to consider quitting to take jobs in other professional fields. Role stress is correlated to intention to quit among male nurses. Role stress and years of service are highly relevant predictors of male nurse intention to quit and leave the nursing profession, explaining 33.8% of variability. We suggest that at various levels of education and society, promotion of male and female equality should be increased. There is also a need for psychological consultation as well as the promotion of male nurse role models to prevent male nurses turning away from nursing careers.