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Background General practitioners (GPs) are gatekeepers of residents' health, the rational allocation of resources is the basic guarantee for achieving fairness in health services. At present, research on the allocation of GPs in China mainly focuses on the whole country and individual provinces, lack of research on the allocation of human resources for general practitioners in the western region as the research object. Objective To comprehensively evaluate the current situation of GPs resource allocation in western China from 2015 to 2020, provide a reference for optimizing the resources distribution of GPs in the western region of China. Methods The data for this study were derived from the China Health and Family Planning Statistical Yearbook (2016-2017), the China Health Statistics Yearbook (2018-2022), and the China Statistical Yearbook (2016-2022). Using Atkinson index and location entropy to calculate and decompose the overall allocation of GPs resources in the western region. Using grey prediction model to predict the demand for GPs in the western region from 2022 to 2025. Results From 2015 to 2020, the number of GPs in the western region increased from 39 290 to 94 652, with an average annual growth rate of 19.23%. The Atkinson Index by population, economy, and geography in 2015 and 2020 respectively were 0.1265 and 0.049 3, 0.124 4 and 0.038 2, 0.786 5 and 0.694 4. The location entropy of population, economy, and geographical indicators in the western provinces in 2020 respectively ranged from 0.794 3 to 1.219 0, 0.697 0 to 1.337 3, and 0.043 2 to 7.7270. The location entropy of geographical allocation in the southwest region is greater than 1, while the location entropy of population allocation in the northwest region is better than geographical allocation.The location entropy of economic indicators in Gansu, Qinghai and Guangxi is greater than 1 during the research period.The grey model predicts that the resources of GPs in the western region will show an increasing trend from 2022 to 2025. Conciusion The allocation level of GPs in the western region is gradually improving, and the structure is gradually optimizing. However, there are still problems such as insufficient total quantity, uneven distribution, low registration rate, and poor fairness. Suggestions should be based on geographical classification as the standard, with the principle of "Adjust increment and optimize inventory", the goal of occupational attractiveness, and the guidance of resource integration and regional collaboration to further optimize the resource allocation of GPs in the western region.

In this paper, an end-to-end deep learning framework for reconstructing 3D models by computing depth maps from multiple views is proposed. An unsupervised 3D reconstruction method based on multi-view propagation is introduced, which addresses the issues of large GPU memory consumption caused by most current research methods using 3D convolution for 3D cost volume regularization and regression to obtain the initial depth map, as well as the difficulty in obtaining true depth values in supervised methods due to device limitations. The method is inspired by the Patchmatch algorithm, and the depth is divided into n layers within the depth range to obtain depth hypotheses through multi-view propagation. What's more, a multi-metric loss function is constructed based on luminosity consistency, structural similarity, and depth smoothness between multiple views to serve as a supervisory signal for learning depth predictions in the network. The experimental results show our proposed method has a very competitive performance and generalization on the DTU, Tanks & Temples and our self-made dataset; Specifically, it is at least 1.7 times faster and requires more than 75% less memory than the method that utilizes 3D cost volume regularization.

Objective: This study aimed to investigate the effects of different processing temperature on texture profile and flavor of dried edible bird's nest. Methods: With dried edible bird's nest as the main raw material, the texture profile analysis of edible bird's nest at different processing temperature was carried out by physical property analyzer. The volatile components of edible bird's nest at different processing temperature were determined by electronic nose and solid phase microextraction gas chromatography-mass spectrometry (SPME-GC-MS). Results: It was found that the adhesion of cooked edible bird's nest decreased significantly (P＜0.01), but its resilience increased significantly (P＜0.05) with the increase of temperature. 12 kinds of effective flavor substances were detected in the cooked edible bird's nest by SPME-GC-MS, including: 3 alcohols, 2 aldehydes, 2 esters, 3 ketones, 1 acid, and 1 ether, accounting for 6.23%, 49.34%, and 54.85% of the total detected substances in the cooked edible bird's nest at 95 ℃, 105 ℃ and 115 ℃, respectively. Conclusion: Different processing temperature affects the taste of edible bird's nest and the overall odor profile after processing. Moreover, higher cooking temperature tends to make the egg white-like flavor stronger. The volatile substances in the bird's nest stew at 95 ℃ are mainly acids, the bird's nest cooked at 105 ℃ mainly produces alcohols, and the edible bird's nest cooked at 115 ℃ mainly produces ketones and alcohols.

Abstract Aim To explore the impact of the Omicron variant on maternal and neonatal outcomes. Design Cross‐sectional cohort study of women giving live birth in a single hospital in Shanghai in December 2022. Methods Demographic characteristics, maternal and neonatal outcomes and laboratory testing results were retrieved from medical records. Propensity score matching was used to match COVID‐19‐positive and ‐negative women. Differential analysis was used to assess associations between COVID‐19 and in‐hospital maternal and neonatal outcomes. Results A total of 1508 women were included, comprising 729 natural births, 741 caesarean sections and 38 forceps deliveries. After 1:1 matching, 310 clients were included for analysis with each 155 in COVID‐19‐positive and ‐negative groups. Higher maternal fever was found in all modes of delivery, and higher preterm birth and lower pH value of blood gas of the umbilical artery in the vaginal delivery subgroup (p

Resistant starch has the benefits in the regulation of intestinal flora, improvement of intestinal function, control of cholesterol levels and glycemic index. In recent years, the most concerned is the prebiotic effect of resistant starch. Fermented milk has been considered as the best carrier of probiotics and prebiotics. Adding type III resistant starch to fermented milk could not only improve the quality of fermented milk, but also enhance the functionality of fermented milk. This paper briefly introduced the relationships between resistant starch and prebiotics, and summarized the application of type III resistant starch in fermented milk. This paper also expounded the effect of type III resistant starch on the quality of fermented milk and its probiotic evaluation, which could provide reference for the application and development of type III resistant starch in functional fermented milk.

Gastric cancer (GC) is a common cancer worldwide with high mortality. Sirtuin 1 (SIRT1) and apurinic/apyrimidinic endodeoxyribonuclease 1 (APE1) are abnormally expressed in GC cells and related to p53, which is involved in ferroptosis. Thus, we explore the mechanism via which SIRT1, APE1, and p53 impact ferroptosis in GC cells. Specifically, GC cells were transfected with small-interfering RNA for SIRT1 (SiSIRT1) or small-interfering RNA for APE1 (SiAPE1) or with short-hairpin RNA for p53, and the cell viability, Fe2+, malondialdehyde (MDA), and glutathione (GSH) contents were detected by cell counting kit-8 assay and enzyme-linked immunosorbent assay. Western blot, immunofluorescence, and quantitative real-time polymerase chain reaction were conducted to quantify SIRT1, APE1, p53, solute carrier family 7 member 11 (SLC7A11), and glutathione peroxidase 4 (GPX4) levels in GC cells. Silencing of SIRT1 decreased viability, GSH content, and expressions of GPX4 and SLC7A11, while increased Fe2+, MDA content, and p53 expression in GC cells. Such aforementioned effects were reversed by APE1 overexpression. Also, SiAPE1 generated the same effects as SiSIRT1 on the above aspects, which was offset by p53 silencing. In short, SIRT1/APE1 promotes the growth of GC cells by targeting p53 to inhibit ferroptosis.

Metrnl is a new cytokine with homologous orignination from neurotrophic factor Meteorin. Meanwhile, as a secreting protein, its gene and products show low tissue specificity and is widely expressed in different tissues of host. Similar to neurotrophic factor, adipocytokines, inflammatory factor and muscle factor, the protein plays a role in neural development, immune inflammatory response and metabolism and so on.

This paper reported a case of a 14-year-old female patient with schizophrenia of more than 2 years who had poor efficacy on atypical antipsychotics such as aripiprazole， risperidone and olanzapine， and who developed acute dystonia adverse effects during administration. Subsequently， the treatment was changed to clozapine therapy， and during this treatment， the patient's psychotic symptoms improved， but developed salivation and adverse effects such as clozapine-induced oculogyric crisis， slurred speech and dysphagia. This paper discussed this case with a view to providing a reference for clinicians in the recognition and management of oculogyric crisis caused by clozapine.

Based on the current situation, this article starts from the safety prevention and control pressure faced by the hotel and catering industry under the normalization of epidemic prevention and control, analyzes the current situation of hotel catering, and clarifies the safety responsibility of hotel catering and the significance of ensuring food safety in catering links. The practical work of safety prevention and control in the catering industry puts forward the practical and feasible safety management countermeasures.

ObjectiveTo investigate effect of conducting training of autism spectrum disorder （ASD） early screening skill on improving the ability to early identify ASD of medical staffs in primary care hospitals.MethodsIn September 2021， the training of ASD early screening skills was carried out for medical staffs from 20 primary care hospitals in Chengdu. After training， the training effect was evaluated. The numbers of referrals from primary care hospitals to superior hospitals， confirmed ASD as well as their average diagnostic age of children with ASD before and after training were used as evaluation indicators.ResultsAfter training， the number of children with suspected ASD referred by primary care hospitals was more than that before training ［（16.65±11.60） vs. （3.40±2.23）， t=5.431， P

Abstract Driven by their many unique features, perovskite solar cells (PSCs) have become one of the most promising candidates in the photovoltaic field. Two‐step preparation of perovskite film is advantageous for its higher stability and reproducibility compared to the one‐step method, which is more suitable for practical application. However, the incomplete conversion of the dense lead iodide (PbI2) layer during the sequential spin‐coating of formamidinium/methylammonium (FA+/MA+) organic amine salts severely affect the performance of PSCs. Herein, sodium bicarbonate (NaHCO3) is used to induce the formation of porous PbI2, which facilitates the penetration of the FA+/MA+ ions and the formation of a perovskite film with high crystallinity and large grain microstructure. Meanwhile, the introduction of Na+ not only improves the energetic alignment of the PSC, but also increases the conductivity via p‐doping. As a result, the optimized NaHCO3‐modified PSC achieves a champion power conversion efficiency of 24.0% with suppressed hysteresis. Moreover, the significant reduction in defect density and ion migration as well as a mild alkaline environment enhance the stability of device. The unencapsulated NaHCO3‐modified PSCs maintain over 90% of their original efficiency upon storage in ambient air (30%–40% relative humidity) for 2160 h. We have demonstrated an ingenious strategy for controlling the quality of perovskite and improving the performance of device by low‐temperature foaming of simple inorganic molecules of NaHCO3.

The aim of this study was to verify the biological function of miR-1273h-5p in gastric cancer (GC) and its underlying mechanisms. The differential expression of microRNAs between GC and tumor-adjacent normal tissues was detected using microarrays, miR-1273h-5p, and chemokine (C-X-C motif) ligand 12 (CXCL12) mRNA, and protein levels were evaluated using polymerase chain reaction and Western blotting methods, cell proliferation, apoptosis, migration, and invasion were determined by CCK-8, flow cytometry, and transwell assay. Compared to tumor-adjacent normal tissue and gastric epithelial mucosa cell line cells, miR-1273h-5p was significantly downregulated in tissues and cells of GC. The overexpression of miR-1273h-5p could inhibit cell proliferation, migration, invasion, and promote cell apoptosis; in contrast, inhibition of miR-1273h-5p expression could reverse this process. Moreover, a significant upregulation of CXCL12 was observed when the miR-1273h-5p was downregulated in GC cells. Additionally, miR-1273h-5p significantly reduces tumor volume and weight. Thus, this study suggests that miR-1273h-5p regulates cell proliferation, migration, invasion, and apoptosis during GC progression by directly binding to CXCL12 mRNA 3′-untranslational regions, which may be a novel diagnostic and therapeutic target in GC.

Abstract Perovskite silicon tandem solar cells are one of the effective ways to further improve the photoelectric conversion efficiency (PCE) in the research and development of solar cells in the future. CsPbIBr2 can be used as the top cell material in tandem solar cells due to its wider bandgap and better long‐term stability. However, the serious defect density and carrier recombination limit its further improvement. In this work, Octylammonium Octyldithiocarbamate (ODTC) is added to the CsPbIBr2 precursor. Through its strong metal ion complexing ability, it combines with the uncoordinated Pb2+ in the CsPbIBr2, and then thermally decomposes to produce PbS during the annealing process. As an additive, ODTC modulates the crystallization of CsPbIBr2, increases the crystal size, reduces defect density, extends carrier lifetime, and improves charge transfer. Moreover, in situ‐generated PbS can also optimize photovoltaic performance of CsPbIBr2 perovskite solar cell (PSC). Consequently, the champion PCE of the devices can attain to 10.15% and still maintain an initial efficiency of 90% after 45 days. Therefore, the strategy is an effective way to prepare efficient and stable CsPbIBr2 PSCs.

Abstract Background Bone marrow mesenchymal stem cells have always been a heated research topic in bone tissue regeneration and repair because of their self-renewal and multi-differentiation potential. A large number of studies have been focused on finding the inducing factors that will promote the osteogenic differentiation of bone marrow mesenchymal stem cells. Previous studies have shown that macrophage exosomes or miRNA-26a-5p can make it work, but the function of this kind of substance on cell osteogenic differentiation has not been public. Methods M2 macrophages are obtained from IL-4 polarized bone marrow-derived macrophages. Exosomes were isolated from the supernatant of M2 macrophages and identified via transmission electron microscopy (TEM), western blotting, and DLS. Chondrogenic differentiation potential was detected by Alcian blue staining. Oil red O staining was used to detect the potential for lipogenic differentiation. And MTT would detect the proliferative capacity of cells. Western blot was performed to detect differential expression of osteogenic differentiation-related proteins. Results The results showed that M2 macrophage exosomes will promote bone differentiation and at the same time inhibit lipid differentiation. In addition, M2 macrophage-derived exosomes have the function of promoting the expression of SOX and Aggrecan suppressing the level of MMP13. The exosome inhibitor GW4689 suppresses miRNA-26a-5p in M2 macrophage exosomes, and the treated exosomes do not play an important role in promoting bone differentiation. Moreover, miRNA-26a-5p can enable to promote bone differentiation and inhibit lipid differentiation. miRNA-26a-5p can promote the expression of ALP (alkaline phosphatase), RUNX-2 (Runt-related transcription factor 2), OPN(osteopontin), and Col-2(collagen type II). Therefore, it is speculated that exosomal miRNA-26a-5p is indispensable in osteogenic differentiation. Conclusions The present study indicated that M2 macrophage exosomes carrying miRNA-26a-5p can induce osteogenic differentiation of bone marrow-derived stem cells to inhibit lipogenic differentiation, and miRNA-26a-5p will also promote the expression of osteogenic differentiation-related proteins ALP, RUNX-2, OPN, and Col-2.

BackgroundArid and semi-arid regions account for about 40% of the world’s land surface area, and are the most sensitive areas to climate change, leading to a dramatic expansion of arid regions in recent decades. Ephemeral plants are crucial herbs in this area and are very sensitive to climate change, but it is still unclear which factors can determine the distribution of ephemeral plants and how the distribution of ephemeral plants responds to future climate change across the globe.AimsUnderstanding the impact of climate change on ephemeral plant distribution is crucial for sustainable biodiversity conservation.MethodsThis study explored the potential distribution of three types of ephemeral plants in arid and semi-arid regions (cold desert, hot desert, and deciduous forest) on a global scale using the MaxEnt software. We used species global occurrence data and 30 environmental factors in scientific collections.ResultsOur results showed that (1) the average value of the area under the receiver operating curve (AUC) of each species was higher than 0.95, indicating that the MaxEnt model’s simulation accuracy for each species was good; (2) distributions of cold desert and deciduous forest species were mainly determined by soil pH and annual mean temperature; the key factor that determines the distribution of hot desert species was precipitation of the driest month; and (3) the potential distribution of ephemeral plants in the cold desert was increased under one-third of climate scenarios; in the hot desert, the potential suitable distribution for Anastatica hierochuntica was decreased in more than half of the climate scenarios, but Trigonella arabica was increased in more than half of the climate scenarios. In deciduous forests, the ephemeral plant Crocus alatavicus decreased in nearly nine-tenths of climate scenarios, and Gagea filiformis was increased in 75% of climate scenarios.ConclusionsThe potential suitable distributions of ephemeral plants in the different ecosystems were closely related to their specific adaptation strategies. These results contribute to a comprehensive understanding of the potential distribution pattern of some ephemeral plants in arid and semi-arid ecosystems.

Background: Millions of people suffer from Alzheimer's disease (AD) and Parkinson's disease (PD) worldwide. Due to their complex pathology, no effective pharmacological treatment has been found to date, despite extensive research. Developing new, effective therapeutic agents to cure these disease remains a major challenge. Although the cause of AD and PD remains illusive, numerous studies indicates that oxidative stress and neuro-inflammation lead to neurodegeneration in the central nervous system and play vital role in AD and PD morbidity and progression. Flavonoids, which are found widely in nature, exhibit anti-oxidative, anti-inflammatory, anti-mutative, anti-microbial, and neuroprotective properties, so have potential to treat these two kinds of diseases. Methods: In this review, we focus on the anti-oxidative and neuroprotective action of flavonoids in attenuating Alzheimer's and Parkinson's disease, and how they might be harnessed in the development of new pharmacological agents to treat these two diseases. Result: Some flavonoid compounds, like hesperidin, naringin, naringenin, tangeretin, nobiletin, silibinin, Epigallocatechin-3-gallate, displayed to be effective in both AD and PD. Conclusion: Considerable studies have demonstrated the anti-AD and anti-PD effects of flavonoids through various in vitro and in vivo models. However, more rigorous studies are needed to be done for flavonoids to develop into effective drugs and apply them to clinical practice.

Accumulated evidence indicates that geniposide exhibits neuroprotective effects in ischemic stroke. However, the potential targets of geniposide remain unclear.

Objective To investigate the diagnosis, treatment and prognosis of nonodontogenic periapical lesions and to provide a reference for clinical diagnosis and treatment. Methods A case of a patient with right upper molar pulp with apical penetration and local occlusion admitted to the West China Stomatological Hospital of Sichuan University was retrospectively analyzed, and the curative effect of microapical surgery and pith preservation was also analyzed. Results The imaging features of tooth 16 showed periradicular radiolucency combined with local radiopaque lesions around the distal buccal apical area. Endodontic microsurgery was performed under local anesthesia. Soft tissue coverage was observed in the distal buccal apical area during the surgery, and no radiopaque tissue was detected. The distal buccal root apex was cut by 3 mm, and mineral trioxide aggregate was used for root-end backfilling. The postoperative pathological results revealed fibrous connective tissue. One-week recall X-ray examination showed tight root-end backfilling and no periradicular radiolucency; an electrical test of pulp vitality showed positive results. The four-year follow-up showed that there was no discoloration in tooth 16 and no significant difference in thermal and electrical tests of pulp vitality compared with control teeth. Combining the clinical manifestations, imaging features, surgical exploration results and pathological reports, the case was most likely to be cemental hypoplasia. Through the literature review, the treatment and healthy pulp preservation of such cases by endodontic microsurgery under the premise of preserving teeth has not been reported.Conclusion For maxillary posterior teeth with periapical lesions but healthy pulp, accurate estimation of pulp status, endodontic microsurgical exploration and application of bioactive materials can achieve vital pulp preservation while removing the lesions.

C19H14Br3CdF6N3O5, triclinic, P1‾$‾{1}$ (no. 2), a = 9.2591(4) Å, b = 9.6573(5) Å, c = 16.9256(9) Å, α = 102.707(2) Å, β = 96.854(2) Å, γ = 112.550(2) Å, V = 1328.20(12) Å3, Z = 2, Rgt (F2) = 0.0291, wRref(F2) = 0.0625, T = 150.15 K.

C7H4CuF6NO4, triclinic, P1̄ (no. 2), a = 8.5122(5) Å, b = 8.5458(6) Å, c = 8.8674(6) Å, α = 75.042(3)°, β = 68.601(2)°, γ = 89.809(3)°, V = 577.26(7) Å3, Z = 2, Rgt(F) = 0.0247, wRref(F2) = 0.0625, T = 152.41 K.

The parameters of processing instant water chestnut was optimized with quality score and dehydration rate as indexes.The results showed that the sucrose concentration in impregnating solution was 15%,the ratio of water chestnut to impregnating solution was 1∶12 g/mL,impregnated for 9 h,dried at 60 ℃for 2 h.The products instant water chestnuttasted sweet and crisp with light yellow surface,the quality score was 95.6 and dehydration rate was 10.5%.The floating range of the color difference was less than 2.5 and lustre value was 81.05 after storage for 60 days,the color and lustre of instant water chestnutwas basically stable.

Storage and transportation are one of the primary restrictions on the approach involving hydrogen energy. The traditional hydrogen storage methods, including high-pressure gas cylinder and cryogenic liquid tank show unfavorable economy, thus hindering their further industrial application and development. Metal hydrides can reversibly react with hydrogen and accomplish the hydriding/dehydriding process under mild operation conditions, which feature advantages such as large hydrogen storage amount, low operation pressure and energy consumption. This process is expected to replace the conventional hydrogen storage and transportation. Meanwhile, considering the strong endothermal/exothermic effect during hydrogenation/dehydrogenation, the prompt heat removal/support inside the metal hydride reactor is a key parameter for H2 absorption/desorption rate and H2 storage efficiency. To improve the heat transfer and absorption/desorption rates of metal hydride reactor, comprehensive analysis and evaluation were conducted. Based on the heat and mass transfer intensification, a new elliptical spiral mini-tube bundle reactor (ESMBR) with high efficiency was designed and proposed; the reactor possesses numerous features, such as high heat transfer speed, compact structure, high reaction rate, and convenient operation. All the hydrogen storage reactor models were established, and both the model accuracy and effectiveness were experimentally validated. Numerical simulations of ESMBR, spiral mini-tube bundle reactor, and mini-tube bundle reactor were calculated and compared by COMSOL. ESMBR was proven to exhibit favorable heat and mass transfer performance during the H2 storage. Results of further analysis indicate that the sensitivity order of elliptical spiral structure parameters as follows: Dc > A > B > Pt > α. A multi-element valued model was used to evaluate the reactor schemes systematically, and the calculation results show the integrated superiority of ESMBR could achieve a value of 0.845. The comparison results indicate that the ESMBR presents an outstanding performance compared with other reactors and features a broad application prospect in the field of hydrogen energy.

Aiming at the requirement of the hybrid sky-surface network for radar receiver, the design of analog front-end for dual-band multi-channel digital radar receiver based on software radio idea is proposed and implemented. The design takes an analog-to-digital conversion chip as the core, which achieves the amplification and sampling of 8-channel dual-band receive signals , ensures the consistency of the channel gain, and simplifies the circuit when keeping the flexibility. Finally, through the system simulation and field test of the receiver, the correctness of the design is proved, and it can meet the practical application requirements.

C30H21F9N4NiO8, monoclinic, P21/c (no. 13), a = 10.0630(11) Å, b = 9.625(1) Å, c = 18.196(2) Å, β = 116.10(3)°, V = 1582.7(5) Å3, Z = 2, Rgt(F) = 0.0511, wRref(F2) = 0.1261, T = 293(2) K.

Tin oxide (SnO2), as electron transport material to substitute titanium oxide (TiO2) in perovskite solar cells (PSCs), has aroused wide interests. However, the performance of the PSCs based on SnO2 is still hard to compete with the TiO2-based devices. Herein, a novel strategy is designed to enhance the photovoltaic performance and long-term stability of PSCs by integrating rare-earth ions Ln3+ (Sc3+, Y3+, La3+) with SnO2 nanospheres as mesoporous scaffold. The doping of Ln promotes the formation of dense and large-sized perovskite crystals, which facilitate interfacial contact of electron transport layer/perovskite layer and improve charge transport dynamics. Ln dopant optimizes the energy level of perovskite layer, reduces the charge transport resistance, and mitigates the trap state density. As a result, the optimized mesoporous PSC achieves a champion power conversion efficiency (PCE) of 20.63% without hysteresis, while the undoped PSC obtains an efficiency of 19.01%. The investigation demonstrates that the rare-earth doping is low-cost and effective method to improve the photovoltaic performance of SnO2-based PSCs.

The effects of salt stress (100, 200, 300 mmol/L) on physiological characteristics of Solanum nigrum seedlings were studied by pot experiment. The results showed that the contents of chlorophyll a, chlorophyll b, carotenoids and total chlorophyll in S. nigrum leaves showed a trend of first flattening and then increasing with the aggravation of salt stress. With the aggravation of salt stress, the net photosynthetic rate, stomatal conductance and intercellular CO2 concentration of S. nigrum decreased gradually, and reached the lowest value when the NaCl concentration was 300 mmol/L. With the increase of NaCl concentration, the SOD activity of S. nigrum leaves decreased gradually. When the concentration of NaCl was 300 mmol/L, the SOD activity of S. nigrum decreased by 53.39% (P < 0.05). The activities of POD, CAT and soluble protein in S. nigrum increased first and then decreased with the increase of NaCl concentration. When the concentration of NaCl was 100 mmol/L, the activities of POD, CAT and the content of soluble protein reached the maximum.

In terms of the mechanism of scientific and technological service promoting innovation and entrepreneurship, innovation can significantly improve labor productivity and labor factor efficiency, and promote the optimization and upgrading of industrial structure. Sustainable economic development must rely on technological innovation. This paper designs an innovative science and technology service system to achieve the goal of industrial economic development from five aspects: market-oriented mechanism, demand-oriented mechanism, industry university research collaborative innovation mechanism, scientific and technological financial system construction, and scientific and technological talent team construction.

Modernized urban organization relies more on the foundation of ecological infrastructure (EI) with the planning objectives based more on synthetical benefits of economy, society and ecological environment. The effect of multiple factors ought to be taken into consideration in the urban scenic spot planning and and the process of formulating the related plan faces a challenge of how to organically bound environmental factors to tour function of urban scenic spot. This thesis, taking YunLong Lake, a scenic spot in XuZhou, JiangSu province as an example, studies how to ameliorate the planning of urban scenic spot combined with the ecological chain and reversed-planning theory. The result shows that utilizing the theory flexibly when analyzing the urban scenic spot planning design can ensure the existing ecological connection between each system and maintain the ecological stability of urban scenic spot. Thus, with the basis of ecological chain and reversed-planning theory, this paper puts forward a new planning concept and work flow, in order to provide new ideas for modernized urban scenic spot planning.

Double arc gears are widely used in high load speed reducers,and the inherent mode has an important influence on the performance of the reducer. Computational modal analysis is an efficient method for modal analysis of components using finite element software. In this paper,the modal analysis of the double arc gear was carried out using ABAQUS / CAE software,and discussed the gear in the gear spiral angle on the impact of modal. It will provide basis for dynamic performance optimization,vibration fault analysis and prediction.

Based on the merits of solvent-free extraction of gaseous samples by needle trap, closed circulating purge system consisting of needle trap and water sample by peristaltic pump is established to enhance the Henry's law constant of analytes in the gas/liquid phase. In this study, the method for determination of dichlorvos, phorate, methyl parathion and malathion in groundwater by circulating extraction with needle trap coupled with Gas Chromatography was established. This method integrated sampling, extraction, purification, concentration, and chromatography. The optimum conditions for the extraction by needle trap include sampling flow rate of 11.11 mL/min and extraction temperature of 40℃. Under these conditions, the maximum breakthrough volume of 1 mg/L methyl parathion is 600 mL. The recoveries range from 62.3% to 103.0% for 5 μg/L, 50 μg/L and 200 μg/L analytes. Low level dichlorvos has a relative standard deviation of 26.1%, and other components are lower than 7.7%. The detection limits of the proposed method range from 0.016 to 0.157 μg/L, close to, or better than the current standard results and related study results.