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In this paper, the effects of four different types of nucleating agents, namely, α-nucleating agent CH-6N, HPN-715, TMP-7 and β-nucleating agent TMB-5, as well as the effects of compounding of different types of nucleating agents on the mechanical, optical and crystalline properties of polypropylene were investigated. The results show that the nucleating agent can effectively increase the crystallization temperature and crystallinity. α-nucleating agent CH-6N has the best rigidity effect. The bending modulus and bending strength of polypropylene are 2 390 MPa and 60.6 MPa respectively with the addition of 0.2% CH-6N. The α nucleating agent can reduce the toughness of polypropylene. Adding 0.2% CH-6N, the impact strength of polypropylene is only 2.7 kJ/m². The β -nucleating agent TMB-5 can effectively improve the toughness of polypropylene, but reduce the rigidity. The toughening effect of 0.1 % TMB-5 is the best. The impact strength of polypropylene is 20.7 kJ/m2, and the elongation at break is 530%. In terms of optical properties, α nucleating agent CH-6N has the best modification effect, and after the addition of 0.1% CH-6N, the yellow index of polypropylene is only 0.46. The combination of α nucleating agent and β nucleating agent can not only improve the toughness of polypropylene, but also improve its rigidity, and achieve the balance of rigidity-toughness. The compound modification effect of 0.1% CH-6N and 0.1% TMB-5 is good, and the impact strength of polypropylene is 5.5 kJ/m², the bending modulus is 2 140 MPa, and the tensile strength is 41.1 MPa. [ABSTRACT FROM AUTHOR]

Cellulose ether (hydroxyethyl cellulose ether, hydroxypropyl methyl cellulose ether) was used to modify the bonding properties of fly ash-based thin spray materials, and the effects of viscosity and substituent of cellulose ether on the bonding strength, consistency, and its tensile strength and compressive strength of the fly ash-based thin spray materials were studied, and the microstructure of the fly ash-based thin spray materials before and after the incorporation of cellulose ether into the 28 d specimens was studied by scanning electron microscopy. The results showed that the bond strength of the thin-sprayed materials was significantly improved af ter the addition of cellulose ether, with a maximum increase of 294.23% compared with that of the unadulterated cellulose ether group. Under the same substituent, the bonding performance of the cellulose ether samples with low viscosity was higher. Under different substituents, the bond strength of hydroxyethyl cellulose ether specimens was higher, and the adverse effect on mechanical properties was smaller. The 28 d bond strength of fly ash-based thin spray material incorporated with 0.05% (mass percentage of cementitious material) hydroxyethyl cellulose ether (HEC) reached 1.67 MPa, and the compressive strength was 11.4 MPa. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Beijing University of Traditional Chinese Medicine is the property of Journal of Beijing University of Traditional Chinese Medicine and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Urban Mass Transit is the property of Urban Mass Transit Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The shape of the connecting section of the shaft spillway directly affects the flow pattern of the tunnel, the vibration characteristics of the shaft and the energy dissipation effect. At present, the research on the shape of connecting section is mostly single factor, and few multi-factor studies. In engineering design practice, the optimization of shaft shape mostly refers to similar engineering experience, and there is no more systematic optimization method. In this paper, the numerical orthogonal test is used to analyze the sensitivity of the length-width ratio, the contraction ratio of the exit pressure slope and the compression slope ratio of the connecting section. The results show that the length-width ratio has the most significant effect on the outlet turbulent kinetic energy, followed by the compression slope ratio and the lowest contraction ratio. The research results can provide some reference for the optimization of the joint shape of the shaft spillway tunnel in engineering design. [ABSTRACT FROM AUTHOR]

The coastline of the Yellow River Delta has undergone significant alterations due to fluctuations in fluvial water and sediment conditions. To analyze changes in the coastline of the Yellow River Delta from 1976 to 2020, this study considered the effects of various factors, such as tide levels, water calculation indices, and high and low tide stages on coastline extraction. Coastlines were extracted utilizing tools like ArcGIS and ENVI, and the Digital Shoreline Analysis System was used to quantify the coastline characteristics. The study found that selecting remote sensing images with good imaging quality and similar tide levels during the ebb phase, along with the use of the Modified Normalized Difference Water Index for calculation, resulted in higher accuracy in coastline extraction. Based on the extracted coastline data, it was found that the coastline of the Yellow River Delta has undergone spatio-temporal variations. The Shenxiangou-Diaokouhe lobe coastline has been eroding since 1976, while the coastline from Dongying port to Gudong oilfield has remained stable since the 1990s due to an artificial seawall for protection. The changes in the coastline near the estuary were found to be related to the amount of fluvial sediment. When there was enough sediment, the coastline tended to accumulate or deposit, while it eroded and retreated when there wasn't enough sediment. Other factors, such as deltaic channel avulsions and oceanic dynamics, also had an impact on the coastline of the Yellow River Delta. The findings of this study can serve as valuable guidance for future comprehensive management planning of the Yellow River Delta. [ABSTRACT FROM AUTHOR]

Due to their underdeveloped physiological maturity, preterm infants often face challenges related to sucking, breathing, and swallowing coordination during initial feeding. This lack of coordination may lead to episodes of apnea and choking, resulting in unstable vital signs. Preterm infants with this issue must gradually learn oral feeding skills appropriate to their developmental stage. Registered nurses play a critical role in assessing the right time to transition from tube to oral feeding and in providing a safe and positive oral feeding experience. In this article, three validated assessment tools for feeding premature infants are introduced, accompanied by clinical research data demonstrating their use in clinical practice. These three tools include: (1) the Neonatal Oral Motor Assessment Scale, which is applied to evaluate oral motor skills using observations of nonnutritive sucking and the sucking state during the two minutes before feeding; (2) the Premature Oral Feeding Readiness Assessment Scale, which is used to assess readiness for oral feeding in preterm infants; and (3) the Early Feeding Skills assessment, which is used to evaluate the oral feeding skills of preterm infants. These tools aid nurses in helping preterm infants achieve independent oral feeding, facilitating earlier discharge and return to home. The clinical implications and effectiveness of these tools are also discussed to provide to nurses the means and confidence necessary to apply them appropriately in clinical settings. [ABSTRACT FROM AUTHOR]

Objective To explore the effect of homework time on myopia of primary school students and evaluate its differences among different grades. Methods A total of 183 districts in 21 cities of Sichuan Province were selected as research sites. Two primary schools were randomly selected from each research site, and students in grades 4-6 were selected form the whole class basis. At least 80 students from each school were selected for visual screening and questionnaire survey. Logistic regression analysis was used to analyze the effect of homework duration on myopia. Results 47 054 students from grades 4 to 6 were included in the study, including 32.5% in grade 4, 33.4% in grade 5 and 34.0% in grade 6. The myopia rate of students in grades 4-6 was 50.3%, and it increased with the increase of grade. After controlling covariates, the average daily homework time < 1 h was taken as reference, and the homework time of 1-2 hours was the risk factor for myopia (OR = 1.059, P = 0.008). Stratified by sex, the same effect was observed in male students (OR = 1.102, P = 0.001), and was most pronounced in male students in grade 5 (OR = 1.123, P = 0.026). The same effect was observed among students with good economic level (OR = 1.097, P = 0.005). Conclusion Homework may increase the risk of myopia of primary school students. It is suggested to arrange homework time scientifically and reasonably. [ABSTRACT FROM AUTHOR]

In the mid-7th century, in the Turfan region, the main type of funerary inscription changed from mubiao (tomb announcements) to muzhi (tomb epitaphs). This change is attributed to the influence of Central Plains' culture, which scholars have suggested was transmitted after the Tang Empire conquered the Qu's Gaochang kingdom and established the prefecture of Xizhou in the Turfan area. This article explores the reasons for this change from the perspective of regional interaction with a focus on the agency of the Turfan people in the process of cultural exchange. The article starts by defining the structure of mubiao and muzhi and proposes a new classification framework to sort the inscriptions according to how they were structured. After this sorting, it investigates the connections between each type of inscription and the time periods in which they were used. It then considers how each type of inscription refers to itself. I suggest that muzhi need to be understood by investigating the changes in the numbers of each type as well as the format and content of brick epitaphs in the mid-7th century. Many of the Gaochang elite were relocated to the two capitals after the fall of the Gaochang Kingdom; they were later moved back to Turfan, and it has been suggested that elements of Central Plains' epitaphs were introduced by them. However, the forms of the bricks and the locations of the brick epitaphs in tombs show a continuation of the traditions of the Gaochang kingdom. This continuation reveals that the Gaochang elite actively chose certain elements in the process of cultural exchange. [ABSTRACT FROM AUTHOR]

The study aims to select high-yielding and high-quality triticale cultivars that are well-suited for cultivation in northwest Henan region through an evaluation of six triticale varieties (Triticosecale wittmack) in terms of forage production, quality, seed yield, and composition factors. The findings indicated noteworthy disparities among the tested varieties concerning forage production, nutritional quality, and seed yield. Notably, the 'GN2' cultivar exhibited the highest hay yield (21.49 t/hm²), number of branches (9 330 500 /hm²), and crude protein content (11.86%). Furthermore, 'ZS1257' demonstrated the highest seed yield (6.55 t/hm²) and spiked grain count (56.00 grains). The yield of triticale varieties showed an increasing and then decreasing trend with the increase in the number of tillers, it gradually decreased with the increase in the weight of individual leaves and stems. The contribution of related factors to the grain yield was in the following order: number of grains per ear > thousand-grain weight > number of tillers. The study indicates that through comprehensive evaluation, 'GN2' ranks first and can be promoted as a forage-type triticale for planting in the northwest Henan region. [ABSTRACT FROM AUTHOR]

This study aimed to optimize the extraction process of total saponins from the fungal matrix resulting from the dual solid-state fermentation of Hericium erinaceus-Astragalus membranaceus residue (HAMTS) and to determine its antioxidant activity. The content of total saponins before and after fermentation was measured using the vanillin method. A response surface method combined with ultrasonication was employed to optimize the extraction of HAMTS, and the reducing power as well as the scavenging ability against DPPH and ABTS+ free radical of HAMTS were analyzed. The results showed that the content of HAMTS after fermentation was 10.34 mg/g, with an increase of 63.35%. Under the optimal extraction conditions: Liquid-to-solid ratio of 19 mL/g, ultrasonication time of 16 min, ethanol volume fraction of 74%, ultrasonic power of 62 W, the extraction amount of HAMTS was 11.48 mg/g. At a concentration of 10 g/L, the reducing power of HAMTS, as well as the DPPH and ABTS+ free radical scavenging rates, were 0.80, 96.48%, and 56.12%, respectively. The study indicates that the regression model established in the experiment can be used to predict the extraction amount of HAMTS, and HAMTS exhibits good antioxidant activity, demonstrating the potential for development as a feed additive. [ABSTRACT FROM AUTHOR]

To improve the energy efficiency of a coupled natural gas hydrate exploitation and reforming hydrogen production system, process design and modeling were conducted, and models for energy efficiency assessment and economic analysis were established. Focusing on the selection between fuel heating or electric reforming in the reforming process, whether offshore wind power is integrated in electric reforming, and the selection between membrane separation or amine scrubbing in H2 separation, the exergy efficiency ratio and annual total cost of different technical schemes were compared. The results show that System C, with electric reforming without offshore wind power integration and membrane separation, has the highest exergy efficiency ratio (2.25). System B, with fuel heating reforming and membrane separation, has the lowest annual total cost (5803.91 106 CNY/a). System F, which integrates offshore wind power and uses amine scrubbing for separation, has the highest annual total cost (5862.09 106 CNY/a), only about 1.0% higher than the most economically efficient System B, but with higher energy efficiency. This indicates that the application of membrane separation and offshore wind power on hydrate exploitation platforms has significant potential in both energy efficiency and economy. [ABSTRACT FROM AUTHOR]

Chloritization is a typical middle-low temperature hydrothermal alteration type of early ore-forming stage in Shulouqiu deposit of Changjiang rock mass in southern Zhuguang. In this paper, the chlorite in the horizontal alteration zone around the ore body are studied comprehensively by optical microscopy, electron probe and scanning electron microscopy. Based on the lithological characteristics and genesis of chlorite, they are divided into five types: fissure filling chlorite, biotite altered chlorite, feldspar altered chlorite, dolomite altered chlorite and spherical chlorite. The five types of chlorite are all trioctahedral iron-rich chlorite with the same structure type, belonging to three species: vermicular chlorite, ferromagnesian chlorite and uraninite chlorite. Then, the five types of chlorite may have formed in the same period of fluid action in the early ore-forming period, with the formation temperature between 219 ~ 282°C and log fo2 between -47.74 ~ -43.69. Combined with previous research results in the region, the early ore-forming fluid may be a crust-mantle mixed fluid dominated by mantle-derived materials, with strong reducibility. Its formation is related to the intrusion of regional basic veins, which provides a reducing field for the mineralization system, resulting in the reduction and precipitation of U6+ in the ore-forming fluid. [ABSTRACT FROM AUTHOR]

Structured matrices play an important role in scientific computing and engineering applications, such as Cauchy, Toeplitz, Vandermonde, and Hankel matrices. Although these matrices are dense, they can be expressed with only O(n) parameters (generators), where n is the dimension of the matrix. The core idea of the algorithm in this paper is to use matrix generators to explicitly construct local matrix blocks of each process, thereby reducing communication overhead. Additionally, by leveraging the numerical low-rank property of these matrix blocks. This paper further minimize computational overhead. Consequently, the proposed parallel structured matrix multiplication algorithm framework can simultaneously reduce both computational and communication costs, making it suitable for matrix multiplication algorithms like Cannon, Fox, and PUMMA. Extensive numerical tests were conducted on the Tianhe-2 supercomputer, and the results demonstrate that the proposed algorithm achieves an 8.96x speedup compared to the PDGEMM function in ScaLAPACK. [ABSTRACT FROM AUTHOR]

Aiming at the current problems of poor crushing effect, high energy consumption, slow decomposition speed and low degree of decomposition of banana straw after crushing etc., a banana straw crushing and returning machine with rotting agent spraying device was designed. The straight shaped knife was optimized, the arrangement of knife roller was symmetrical single helix arrangement, the crushing knife axle rotational speed range was 1 500~1 860 r·min-1, the spraying device selected 180 L tank and fan nozzle with spray angle of 90°, single nozzle flow rate was 0.8 L·min-1, and 4 nozzles were fixed to the drug pole at 370 mm intervals. A two-factor, three-level field test and a comparative test was conducted with the forward speed of the machine and the rotational speed of the knife roller as independent variables, and the qualified rate of straw crushing and unevenness of spreading as dependent variables. The results showed that the machine forward speed was 1.4 m·s-1 and the knife roller rotational speed was 1 860 r·min-1, and the qualified rate of banana straw crushing was 93.08% and the unevenness of spreading was 12.11%. This device realized the joint operation of banana straw crushing and rotting, which not only improved the crushing effect of straw but also promoted the decomposition of straw organic matter compared with the previous generation of machines, and provided technical references for the research of the subsequent banana straw rotting and field returning machine. [ABSTRACT FROM AUTHOR]

Abstract:Techniques based on deep learning neural network models are widely used in computer vision, natural language processing, and other fields. However, researchers have found that neural network models have significant security risks, such as vulnerability to adversarial sample attacks. Studying the techniques related to adversarial samples for image classification can help people recognize the vulnerability of neural network models, which in turn can promote the research of security hardening mechanisms for related models. To overcome the challenges of high time overhead and perturbation redundancy of the JSMA method, a fast JSMA adversarial example generation method with low disturbance redundancy called S-JSMA is proposed. The S-JSMA method replaces the iterative operation with a single-step one to simplify the work flow of the JSMA algorithm. Moreover, the proposed method adopts a simple perturbation rule rather than the salient graph based perturbation used in JSMA. Consequently, S-JSMA significantly reduces the time overhead and the disturbance redundancy of generating adversarial examples. The experimental results on the MNIST dataset demonstrate that, compared with the JSMA and the FGSM methods, the proposed S-JSMA achieves considerable attacking effects with a significantly shorter time period. [ABSTRACT FROM AUTHOR]

[Background] Dujiangyan irrigation area is an important grain producing area in Sichuan Province, and corn is the main grain crop in Sichuan Province. Dujiangyan Irrigation Project Water Conservancy Project has a large scale and reasonable layout. The area of Dujiangyan irrigation area has gradually increased, and the permanent population has reached 30.3 million. The agriculture is developed, and the water demand is large. The agricultural development in many areas is restricted by the supply capacity of water resources. [Objective] The irrigation water demand of Dujiangyan irrigation area in each growth period of corn was analyzed, and the reasonable regulation of water resources in Dujiangyan irrigation area was carried out, so as to realize the yield increase of corn in the irrigation area. [Method] Eight kinds of meteorological elements in Dujiangyan irrigation area in the past 15 years were collected to calculate water demand, effective precipitation, water profit and loss index and irrigation water demand during maize growth period in the past 15 years; Using the monthly irrigation water consumption model, the irrigation water is allocated at different growth stages of corn to maximize the corn yield in each sub irrigation area, and the irrigation water for corn at each growth stage in each sub irrigation area is determined. [Result] The average annual water demand of maize in Dujiangyan irrigation area is 376 mm, the average annual effective precipitation is 368 mm, the average annual water profit and loss index is -0.24, and the total irrigation water in the whole growth period of maize in the irrigation area is 420 million m m³, Among them, the outer river irrigation area is 30 million m m³, The irrigation area of Bihe River is 44 million m m³, The irrigation area of Tongjiyan is 19 million m m³, The Heilongtan irrigation area is 44 million m m³, The irrigation area of Renmin Canal is 96 million m m³, The second irrigation area of Renmin Canal is 112 million m³, The Dongfeng Canal irrigation area is 75 million m m³. [Conclusion] The water demand of maize in Dujiangyan irrigation area did not change significantly during its growth period, which was related to the planting varieties. During the three key growth stages of jointing, tasseling, and lactation, irrigation requires a large amount of water and requires timely regulation and replenishment of water. The water demand for corn irrigation in the Pihe irrigation area, Renmin Canal 1, and Renmin Canal 2 sub irrigation areas is relatively high, and some of them are located at the tail of the hills, which may cause problems such as seedling dehydration. Therefore, it is necessary to implement staggered scheduling in the plain irrigation area and hilly irrigation area, where water is transported from the plain irrigation area to the hilly irrigation area and stored in the hilly irrigation area. Therefore, this paper carries out precise water resources regulation and control in each growth period of maize sub irrigation areas in order to achieve the yield increase of maize in Dujiangyan irrigation area. [ABSTRACT FROM AUTHOR]

Mineral resources exploration in covered area is an important component of the new round of prospecting breakthrough strategy. It is urgent to summarize and popularize prospecting in covered areas to quickly obtain the information and samples of buried bedrocks through more green and effective drilling technology. Based on the concept of green exploration, this study uses portable shallow drilling equipment and air reverse circulation drilling technique to carry out drilling tests in the exploration of copper polymetallic deposits in the shallow covered area of Baoshan, southeast margin of Daxinganling Mountains, realizing the effect of quickly penetrating the cover layer to obtain the information of hidden bedrocks, verifying geophysical anomalies and collecting geochemical samples. The in-hole imaging technique is simultaneously combined to provide the basic data for distribution range and boundary of the buried lithostratigraphic units in covered areas. The test results show that the multi-method combination based on shallow green drilling technology and in-hole imaging, which provide test samples for rapid field geochemical analysis, can effectively solve the prospecting problem in shallow covered areas, with good promotion value in the process of mineral exploration. [ABSTRACT FROM AUTHOR]

The Derbugan metallogenic belt is located in the eastern Mongolia-Xing'an orogenic belt, between the Ertix-Zuolun-Heihe suture zone and Mongolia-Okhotsk suture zone. Affected by Yanshanian movement, magmatic intrusion is heavy in the area, accompanied by intense gold mineralization in Derbugan area. Through the study of Shabaosi, Xiajibaogou and Xiaoyinuogaigou gold deposits, the paper analyzes the metallogenic characteristics and tectonic background of the gold deposits. The deposits can be classified into four types, including epi-mesothermal altered rock type hosted by sandstone, epithermal type hosted by volcanic rock, magmatic hydrothermal altered rock type related to deep intrusive complex, and tectonic-hydrothermal altered rock type occurred in ductile shear zone. The mineralization time of different types of gold deposits is concentrated mainly in Late Jurassic-Early Cretaceous of Yanshanian. According to the H-O-Pb isotope results, the ore-forming hydrothermal fluid is mainly the mixtures of magmatic water and atmospheric precipitation, with the metallogenic material from mantle-derived magma, mixed with minor crustal material. Different types of gold deposits have certain internal genetic relations and belong to the product of magmatic evolution at various stages in the same magmatic source region. The metallogenesis of the endogenetic deposits of nonferrous and precious metals in the region is characteristically distributed at the intersections of a series of parallel NE-trending structural belts and NW-trending secondary structures. [ABSTRACT FROM AUTHOR]

The northern Daxinganling Mountains is an important part of Daxinganling metallogenic belt, where copper is the main mineral, dominated by porphyry type, large in scale, with great economic value and scientific research significance. Based on the systematic summary of regional geological background and mineralization process of copper deposits in different ages in northern Daxinganling Mountains, the paper summarizes the new exploration results in the area in recent years, and points out that the western margin of Ergun block, southeastern margin of Xing'an block, and suture zone of the two blocks are important for copper deposit prospecting. Attention should be also paid nearby the existing deposits and blind orebodies in the deep for the exploration of copper deposits in northern Daxinganling Mountains. [ABSTRACT FROM AUTHOR]

Liaodong Peninsula is an important part of North China Craton, where intense tectonic movement, magmatic activities and gold mineralization occurred in Mesozoic, and gold deposits of different scales are distributed with typical regional characteristics. Through the systematic summary of basic characteristics such as spatial distribution, ore-bearing wall rock, ore-controlling structures and mineralized alteration, as well as the metallogenesis of gold deposits, the paper analyzes the resources potential of gold deposits in Liaodong Peninsula. According to the spatial distribution of gold deposits, four gold deposit concentration areas are divided, including Maoling, Baiyun-Qingchengzi, Wulong-Sidaogou and Xinfang gold deposit concentration areas. The ore-bearing wall rocks of Maoling and Baiyun-Qingchengzi concentration areas are Paleoproterozoic sedimentary metamorphic rock series, with the mineralization of altered rock type and quartz vein type, and the orebodies mainly controlled by low-angle interlayer faults. The wall rocks of Wulong-Sidaogou concentration area are Middle Jurassic gneissic biotite granite and Paleoproterozoic sedimentary metamorphic rock series respectively, with the main mineralization of quartz vein type, followed by altered rock type, and the orebodies controlled by high-angle fault and low-angle interlayer fault. The wall rocks of Xinfang concentration area are Archean gneisses and Neoproterozoic Qingbaikouan metamorphic sandstone, granulite and marble, with the mineralization of quartz vein type and altered rock type. The orebodies are mostly in veins and controlled by the ductile-brittle secondary faults developed in the foot wall of metamorphic core complex detachment fault and by the structural fractures in the Neoproterozoic Qingbaikouou cap rock. The geochronological study shows that the gold mineralization epoch can be divided into Late Triassic (~220 Ma), Early Jurassic (~190 Ma) and Early Cretaceous (~120 Ma). The study on fluid inclusions indicates that fluid immiscibility is the main mechanism of gold mineralization. The H-O isotopes reveal the ore-forming fluid mainly comes from magmatic water, with atmospheric precipitation added in later period. The He-Ar isotopes show that the ore-forming fluid is mainly derived from crustal source and a little from mantle source. The S-Pb-Sr isotopes indicate that the metallogenic materials mainly come from the Mesozoic magma. Besides, the ore-bearing strata play an indispensable role. The geological characteristics and isotopic data show that the gold deposits in Liaodong Peninsula are of magmatic hydrothermal origin. Combined with regional tectonic evolution, it is believed that the Late Triassic gold deposits in the area are related to the deep subduction of Yangtze plate to North China plate, the Early Jurassic gold deposits related to the subduction and compression of Paleo-Pacific plate to Eurasian plate, and the Early Cretaceous gold deposits were formed in the subduction and exhumation extensional setting of Paleo-Pacific plate to Eurasian plate. According to the geological, regional geochemical and geophysical characteristics of typical deposits, 23 prospecting targets are delineated and 2 414.56 t of gold resources at 3 000 m below surface are predicted. [ABSTRACT FROM AUTHOR]

Copyright of China Mining Magazine is the property of China Mining Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to optimize the process parameters of the mechanical properties of PP/corn straw composites and further optimize the preparation process, the orthogonal test design of L16(44) was used to prepare PP/corn straw composites under different process parameters. The effects of wood-plastic ratio, hot pressing temperature, hot pressing time and hot pressing pressure on the mechanical properties of PP/corn straw composites were analyzed. The results showed that the wood-plastic ratio had the greatest influence on the mechanical properties of PP/corn straw composites among the four factors of wood-plastic ratio, hot pressing temperature, hot pressing time and hot pressing pressure. Secondly, the hot pressing pressure has a great influence on the flexural strength and impact strength of PP/corn straw composites, and the hot pressing temperature has a great influence on the tensile strength of PP/corn straw composites, the hot pressing time has the least influence on the properties of PP/corn straw. When the ratio of wood to plastic is 4:6, the hot pressing temperature is 185 °C, the hot pressing time is 10 min, and the hot pressing pressure is 2.5 MPa, the flexural strength is the maximum value of 39.58 MPa, and the impact strength is the smallest. When the ratio of wood to plastic is 4:6, the hot pressing temperature is 185 °C, the hot pressing time is 15 min, and the hot pressing pressure is 2.5 MPa, the tensile strength is 17.18 MPa. When the ratio of wood to plastic is 3:7, the hot pressing temperature is 190 °C, the hot pressing time is 15 min, and the hot pressing pressure is 2.5 MPa, the impact strength is the maximum value of 3.94 kJ/m², and the flexural and tensile strength are the smallest. By comparing the mechanical properties of these three processes, without considering the focus, the optimal preparation process was obtained as follows: wood-plastic ratio 4:6, hot pressing temperature 185 °C, hot pressing time 15 min, hot pressing pressure 2.5 MPa. [ABSTRACT FROM AUTHOR]

Transparent polypropylene products usually have poor low-temperature resistance impact performance, and the application scope is greatly limited. The high impact strength transparent polypropylene RC-20M is also combined with the advantages of random transparent polypropylene and impact resistant copolymer polypropylene, which has the characteristics of excellent low temperature resistance, high transparency, and strong sealing. This article adopts a variety of analysis and test methods, and evaluates the basic performance and micro-structures of high impact strength transparent polypropylene RC-20M products. By optimizing the injection molding process, the influence of the injection molding process on the mechanical and optical properties of the product was investigated. The results show that RC-20M products have a high crystallization, the crystallization rate is fast, and has a good crystallization ability, which is conducive to shortening the molding cycle and improving the size stability of the product. The small particle size and high degree of homogeneity of the rubber phase of the product are the main reasons for the excellent impact resistance and optical properties of the product. The optical properties and impact resistance performance of the product are improved under the injection molding process of low melting temperature, short holding time, low glue speed, low glue pressure, and low injection speed. [ABSTRACT FROM AUTHOR]

Background: Approximately 30% of patients experience postoperative complications after surgery for early-stage lung cancer. However, the relationships among meridian energy during lung cancer surgery, changes in quality of life, and prognosis have not been investigated. Purpose: This study was designed to explore the associations among meridian energy, changes in quality of life, and prognosis in patients with newly diagnosed lung cancer undergoing surgery. Methods: A longitudinal, repeated-measures design was used. Basic data forms, meridian energy measurements, and a concise 12-item health status questionnaire were administered to the participants at the time of diagnosis, 2 weeks post-surgery, and 12 weeks post-surgery. During this period, changes were analyzed, and their association with postoperative risks was explored. Results: Forty-eight cases were investigated. Both meridian energy and quality of life were found to be significantly decreased 2 weeks after surgery. The high/low ratio of meridian energy, the physical component score of the Short Form 12-Item Health Survey Questionnaire, gender, cancer stage, and body mass index were identified as significantly associated with prognosis. Conclusion/Implications for Practice: The declining trends in meridian energy and quality of life during the 2 weeks after surgery in patients with lung cancer are associated with poor postoperative prognoses. Nurses may use the findings of this study to identify patients at high risk of postoperative complications and develop appropriate strategies to provide comprehensive care. [ABSTRACT FROM AUTHOR]

Exercise can effectively slow aging and prevent the onset and reduce the complications of chronic diseases in the elderly. However, roughly one-third of older adults are inactive. Joyful learning is an effective method for promoting physical activity, while using games is a feasible strategy for achieving joyful learning that enables individuals to fully immerse themselves in and enjoy an activity. Therefore, exploring gaming strategies to enhance physical activity among the elderly is worthwhile. In this paper, a set of gaming strategies based on the literature and practical experience is proposed. The name of this strategy, GAME, is an acronym of the following: goal setting and educational content development (G), activity design and game content creation (A), mechanics and dynamics implementation (M), and evaluation of qualitative and quantitative health outcomes (E). This systematic descriptive approach helps clearly demonstrate how gamification strategies can promote physical activity and health in older adults. The aim of this paper is to provide a reference and guide for education, research, and clinical practice in health promotion programs targeting older adults. [ABSTRACT FROM AUTHOR]

Objective The aim of this study was to investigate the impact and mechanisms of emodin on oxidative stress response in lipopolysaccharide (LPS)-induced murine mononuclear macrophages (RAW264.7). Methods Involved the use of LPS, RAW264.7 cells, and emodin. Experimental groups included a control group, LPS (1 µg/mL) group, and LPS (1 µg/mL) + emodin (15 µmmol/L) pretreatment group. Aldehyde malondialdehyde (MDA) content, intracellular reactive oxygen species (ROS) levels, and silent information regulator 2 (Sirt2) expression were evaluated at 6, 12, and 18 hours after LPS exposure. Additionally, RAW264.7 cells were pretreated with Sirt2 inhibitor AGK2 (20 «mol/L) followed by LPS stimulation, and the above-mentioned parameters were assessed at 6 hours. Results Compared to the control group, MDA content, ROS levels, Sirt2 mRNA, and protein expression in RAW264.7 cells in the LPS group increased at all time points (all P < 0.05). At 6 and 18 hours, MDA content and ROS levels in RAW264.7 cells in the LPS + emodin group decreased significantly (all P < 0.05), while at 12 hours, ROS levels were lower in the LPS group compared to the LPS + emodin group (P < 0.05). Sirt2 mRNA and protein levels significantly increased at all time points (all P < 0.05) compared to the LPS group. In the LPS + emodin + AGK2 group, Sirt2 mRNA and protein levels decreased, and MDA content and ROS levels increased compared to the LPS + emodin group (all P < 0.05) .Conclusion LPS-induced oxidative stress in RAW264.7 cells and emodin attenuate LPS-induced oxidative stress in RAW264.7 cells through Sirt2. [ABSTRACT FROM AUTHOR]

Off-site investment relations among enterprises often bring the flow of capital, logistics, talent, information, and technology across cities, representing a new avenue for studying the urban network. Therefore, an increasing number of studies are investigating urban networks from the perspective of firm relations. Most of these studies mainly use data from intra-firm branches or mega firms' investment to quantify the linkages among cities. However, these studies have neglected the linkages among small-sized enterprises that are often located in small and medium-sized cities, resulting in the lack of authenticity in establishing urban networks. Recently, a small amount of research has begun to use wholesale enterprises' off-site investment data to construct urban networks. However, such research has neglected the indirect linkages and transit effects on enterprise investment routes. Therefore, this study uses investment data of all-industry enterprises from the Industrial and Commercial Enterprise Registration Database to propose a new method for establishing a directed weighted urban network by identifying off-site investment routes among enterprises, which could fill the gap in constructing urban networks from the perspective of micro capital flow. To verify the evolutionary characteristics of urban network structure before and after the implementation of major policies, this study considers the Yangtze River Delta as the empirical study area. Wholesale enterprise investment data from 2006 to 2020 in the Yangtze River Delta are used to construct three urban networks in three time stages. The main conclusions are as follows: (1) The growth model of the urban network scale shows that the growth of off-site investment routes drives the growth of off-site investment scale. The scale of enterprise nodes linked by off-site investment relations significantly increased from 2011 to 2015. However, after 2016, the proportion of off-site investment in the total investment of the Yangtze River Delta increased accordingly. (2) From the perspective of spatial patterns, the urban network of the study area has shifted from a polygonal network structure of interconnected core cities to a V-shaped structure centered around Shanghai, and then to a Z-shaped structure centered around Shanghai and Hangzhou. (3) In terms of network centrality, the cities exhibit a clear hierarchical structure. Although the network is evolving, the hierarchical structure has not changed significantly. However, the linkages between cities show a trend of clustering from low- to high-level cities. (4) In terms of network betweenness, the betweenness of most cities matches their centrality. Notably, the betweenness of Hefei and Wuhu is significantly stronger than their centrality. At different stages of the urban network evolution, cities with high betweenness, such as Shanghai, Hangzhou, and Hefei, play different intermediary roles in the network. This study constructs urban networks from a micro scale perspective of capital flow, thereby filling the gap in existing research. Additionally, unlike previous studies on urban networks that focus on static network structures, this study analyzes the structural evolution of urban networks based on long-term comprehensive data and verifies the characteristics of changes in the network structure, which has certain theoretical value and practical significance. [ABSTRACT FROM AUTHOR]

The AlphaGUARD radon meter is generally widely used as a radon standard instrument for value transfer. This article studied the accuracy of the AlphaGUARD radon meter in low range and consistency in high range, and established a linear relationship for value transfer within the range of 0. 6 ~142. 4 Bq • L-1. Based on tracing to reference standards, radon standard instruments are used to transfer values to circulating radon sources. Quantity transfer experiments based on circulating radon sources, as well as quantity transfer experiments based on standard instruments and certain concentration water samples (greater than 5 Bq • L-1), are conducted separately. Seven technical schemes for transmitting measurement values using radon standard instruments have been developed for four new types of radon meters used in the underground fluid network in recent years, and have been applied in more than 40 radon observation stations nationwide. The continuous application of 12 observation stations for 2 years has shown that the radon value transmission technology scheme is scientifically feasible. Among the 12 radon observation stations, the relative deviation coefficients was less than 5%. This technology scheme can meet the calibration needs of existing radon observations. In addition, uncertainty evaluation experiments were conducted on the transmission scheme. Taking the DDL radon meter as an example, its minimum uncertainty can reach 5. 5% (coverage factor k = 2). The radon measurement value transmission technology established in this study is scientifically feasible, and the application plan can effectively ensure the stability and reliability of the new radon measurement instrument. [ABSTRACT FROM AUTHOR]

Carbon-based materials have large specific surface area, well-developed pores, and a large number of oxygencontaining functional groups on the surface, which have excellent mechanical properties. Introducing carbon-based materials into the hydrogel system can increase adsorption sites, improve mechanical properties, enrich network structure, realize complementary advantages, and overcome performance defects, which is the main idea for developing highperformance hydrogel adsorbents. In this paper, the structural characteristics of different types of carbon based composite hydrogels were summarized, and the mechanism of carbon based materials to enhance the performance of hydrogels was emphatically introduced. The preparation methods of composite hydrogels and their applications in the field of water purification were reviewed. The prospects, limitations and future research potential of carbon based composite hydrogels adsorbents were analyzed. [ABSTRACT FROM AUTHOR]

In order to improve the flame retardancy of EPS insulation materials, different volume ratios of magnesium oxychloride cement (MOC) were added to EPS and its properties were studied. The results show that the mechanical properties of EPS insulation materials gradually increase with the increase of MOC volume ratio. As the volume ratio of MOC increases, the dry density and thermal conductivity of EPS insulation materials continue to increase, indicating a continuous decrease in insulation performance. The limited oxygen index (LOI) of pure EPS is only 18.1%. As the MOC volume ratio increases, the LOI of EPS insulation material gradually increases and combustion becomes more difficult, significantly improving its flame retardancy. When the MOC volume ratio is 9%, EPS insulation material can self extinguish in a short period of time. As the volume ratio of MOC increases, the combustion performance level of EPS insulation materials gradually increases from flammable B3 level to non flammable A2 level. Based on the requirements for the performance of EPS insulation materials in JG/T 536--2017, when the volume ratio of MOC is 9%, the comprehensive performance of EPS insulation materials is optimal. At this time, the compressive strength and tensile strength of EPS insulation materials are 0.256 MPa and 0.198 MPa, respectively, with a dry density of 149 kg/m³, a thermal conductivity of 0.055 3 W/(m·K), and a flame retardant grade of A2. [ABSTRACT FROM AUTHOR]

The development of large-scale models has led to the widespread application of model inference services. Constructing a stable and reliable architectural support for model inference services has become a focus for cloud service providers. Serverless computing is a cloud service computing paradigm with fine-grained resource granularity and high abstraction level. It offers advantages such as on-demand billing and elastic scalability, which can effectively improve the computational efficiency of model inference services. However, the multi-stage nature of model inference service workflows makes it challenging for independent serverless computing frameworks to ensure optimal execution of each stage. Therefore, the key problem to be addressed is how to leverage the performance characteristics of different serverless computing frameworks to achieve online switching of model inference service workflows and reduce the overall execution time. This paper discusses the switching problem of model inference services on different serverless computing frameworks. Firstly, a pre-trained model is used to construct model inference service functions and derive the performance characteristics of heterogeneous serverless computing frameworks. Secondly, a machine learning technique is employed to build a binary classifica- tion model that combines the performance characteristics of heterogeneous serverless computing frameworks, enabling online switching of the model inference service framework. Finally, a testing platform is established to generate model inference service workflows and evaluate the performance of the online switching framework prototype. Preliminary experimental results indicate that compared with the independent serverless computing framework, the online switching framework prototype can reduce the execution time of model inference service workflows by up to 57%. [ABSTRACT FROM AUTHOR]

Daily meteorological data from 1981 to 2022 and citrus growth periods data were used in this paper. The daily mean temperature, daily maximum temperature and their duration were selected as indicators of heat stress in citrus to clarify the spatial distribution characteristic and temporal variation trend of heat stress during citrus growth periods. The spatial and temporal differences of heat stress in different growing periods of citrus were compared using a paired t-test. The results show that (1) the average frequency, times and intensity of heat stress during flowering-fruit expanding stage of citrus are 87.73%, 2.23times•y-1 and 5.28d•times -1, respectively. High-value areas are mainly concentrated in the southeast of Jiangxi province. The average frequency, times and intensity of heat stress during the fruit expanding-fruit coloring stage of citrus are 56.43%, 1.15times•y-1 and 2.74d•times -1, respectively. High-value areas are mainly in the northern and central parts of Jiangxi province. (2) The station ratios, times and intensity of heat stress during the flowering-fruit expanding stage of citrus show a decreasing trend, with an average decrease of 0.90 percent points, 0.02 times and 0.06 d•time -1 every 10 years, respectively. The station ratios, times and intensity of heat stress during fruit expanding-fruit coloring stage of citrus show an increasing trend, with an average increase of 6.80 percent points, 0.26times and 0.50d•times -1 every 10 years, respectively. (3) The paired t-test results show that, the frequency, times and intensity of heat stress during flowering-fruit expanding stage of citrus are significantly higher than that during fruit expanding-fruit coloring stage of citrus. However, the climate tendency of times and intensity of heat stress during flowering-fruit expanding stage of citrus are significantly lower than that during fruit expanding-fruit coloring stage of citrus. The flowering-fruit expanding stage of citrus in Jiangxi province is the most frequent period of heat stress. For now, it is necessary to strengthen citrus defenses against heat stress during the flowering-fruit expanding stage. In the future, we should improve the prevention of heat stress in citrus during the fruit expanding-fruit coloring stage. [ABSTRACT FROM AUTHOR]

Soil denitrification is an important pathway of soil nitrogen loss. The large amount of nitrogen fertilizer applied in agricultural production leads to the increase of soil N2O emission, and it has caused environmental problems such as the enhanced greenhouse effect. At the same time, soil denitrification is also the main way of N2O reduction, so controlling the ratio of soil denitrification products N2O/(N2O+N2) is the key to reduce soil N2O emission. Based on a large quantity of relevant researches, this paper summarized the measurement methods and influencing factors of denitrification product ratio in soil and the mechanism of biochar addition affecting soil denitrification product ratio. The results showed that there was still existing uncertainty about the effect of biochar application on denitrification product ratio, and whether biochar addition could effectively regulate denitrification product ratio and reduce N2O emission was affected by some influencing factors, such as soil physicochemical properties, biochar properties and application amount. Based on the above research status, the future prospects for improving the measurement methods of denitrification products and clarifying the quantitative effects of biochar addition denitrification products ratio and its key influencing factors were proposed. [ABSTRACT FROM AUTHOR]

Soy sauce is a traditional Chinese condiment that is produced through fermentation by a variety of microorganisms, whose raw materials include soybean, wheat, and salt. Enzymes are effective means for enhancing the taste and flavor of soy sauce during microbial fermentation. The unique flavor of soy sauce is derived from the balance between flavor, aroma, and color. In the process of soy sauce fermentation, the proteins and starch in the raw materials are hydrolyzed into amino acids and sugars under the combined action of various enzymes. On the one hand, the chemical reactions between amino acids and sugars lead to the rich color of soy sauce. On the other hand, these enzymatic hydrolysates directly enhance the taste of soy sauce, as well as are further metabolized by a variety of microorganisms into various organic acids and aromatic compounds, resulting in a unique flavor and aroma. In addition, Aspergillus oryzae is an essential microorganism in soy sauce production, producing various enzymes for the decomposition of raw materials and playing a vital role in the fermentation of soy sauce. In this paper, the classification and sources of key enzymes in soy sauce fermentation and their applications in soy sauce are introduced in detail. The application progress of related microbial improvement technology and enzyme preparation in soy sauce fermentation are also discussed. Furthermore, existing problems and future development trends are presented. The findings of this study provide theoretical support for improving the quality of original soy sauce. [ABSTRACT FROM AUTHOR]

Objective To focus on the efficacy at variable frequency stimulation (VFS) after deep brain stimulation (DBS) for the treatment of axial symptoms in Parkinson's disease (PD). Methods Clinical data of 12 patients with PD who underwent bilateral DBS followed by VFS more than one year from January 2018 to June 2022 at Tianjin Huanhu Hospital, Tianjin University were retrospectively analyzed. Axial symptoms were assessed using Unified Parkinson's Disease Rating Scale (UPDRS)-gait posture, Timed Up and Go Test (TUGT) time and the occurrence of freezing of gait (FOG), The Freezing of Gait - Questionnaire (FOG - Q), and Berg Balance Scale (BBS). The above indicators were recorded one week before DBS surgery and in the drug "off" period (baseline), at the end of high frequency stimulation (the end of HFS), at one month follow-up of VFS (short-term VFS), and at one year or more follow-up of VFS (long-term VFS). Results Compared with baseline, BBS scores increased at the end of HFS (t = - 2.845, P = 0.008); UPDRS-gait posture (t = 12.703, P = 0.000; t = 11.737, P = 0.000), TUGT time (t = 8.923, P = 0.000; t = 8.025, P = 0.000) and the occurrence of FOG (t = 4.448, P = 0.000; t = 4.181, P = 0.000), and FOG Q scores (t = 9.186, P = 0.000; t = 8.186, P = 0.000) decreased, while the BBS scores increased (t = - 7.686, P = 0.000; t = - 6.106, P = 0.000) in both short-term VFS and long-term VFS. Compared with the end of HFS, UPDRS-gait posture (t = 11.583, P = 0.000; t = 10.618, P = 0.000), TUGT time (t = 6.922, P = 0.000; t = 6.022, P = 0.000) and the occurrence of FOG (t = 3.612, P = 0.001; t = 3.344, P = 0.002), and FOG-Q scores (t = 7.915, P = 0.000; t = 6.915, P = 0.000) decreased, while the BBS scores increased (t = - 4.842, P = 0.000; t = - 3.262, P = 0.003) in short-term VFS and long-term VFS. Conclusions For PD patients with HFS but poor axial symptoms efficacy after DBS, the use of VFS significantly improves multifaceted axial symptoms with reliable long-term efficacy. [ABSTRACT FROM AUTHOR]

The area where vehicles conduct interchanges is designated as the on-ramp merging area. The traffic efficiency in the ramp merging area drastically decreases if the mainline and ramp traffic flow density reaches saturation. As a current research hotspot in transportation, intelligent network technology, relying on the high- precision motion control and high-efficiency communication of connected-automated vehicle (CAV), can significantly improve the traffic efficiency in the merging area. The fusion strategies used by CAV are assessed in this research utilizing three different control paradigms: feedback control, optimal control, and reinforcement learning. The shortcomings of the three methods in this scenario are summarized, and specific improvement measures are given by reviewing existing research. Also, it offers a thorough summary of the most recent developments and trends in this particular scientific field. [ABSTRACT FROM AUTHOR]

In order to clarify the influence of key cultivation measures on rapeseed oil quality, a single factor field experiments of sowing date, planting density, and nitrogen rate were carried out in Wuhan and Lanzhou with "Xiangzayou 518 (XZY518)" and "Dadi 199 (DD199)" as the experimental materials. The rapeseed was harvested at maturity stage, followed by cold pressing and oil content, oil extraction efficiency, color of rapeseed oil, peroxide value, total polar phenols, and phytosterol content were assessed, and rapeseed oil quality was evaluated comprehensively under each treatment. The results showed that sowing date, density, and nitrogen rate all significantly affected the key quality indexes of rapeseed oil, and the pattern of change of each index was not the same between the two varieties from two sites. Two varieties from two sites had higher oleic acid content in rapeseed oil under early sowing conditions, and as the sowing date was delayed, rapeseed oil color deepened, chlorophyll content increased, and the comprehensive quality decreased. The XZY518 from two sites at D2 density (4.5x105 hm-2) had a lower acid value, higher total polar phenol, total phytosterol, and total tocopherol contents, and better comprehensive quality. The DD 199 from two sites with increasing density, the chlorophyll content of rapeseed oil increased, the color deepened, the linoleic acid content decreased, and the comprehensive quality also decreased. Two varieties from two sites had higher oil content and oil extraction efficiency under low nitrogen (120 kg hm-2). With the increase of nitrogen rate, rapeseed oil color deepened, comprehensive quality declined. Principal component analysis showed that the effect of sowing date on the comprehensive quality of rapeseed oil was greater than that of planting density and nitrogen rate treatments, and that acid value, chlorophyll, total polar phenols, antioxidant power and total phytosterols were key quality indicators affecting rapeseed oils. Correlation analysis showed that seed oil content was significantly positively correlated with oil extraction efficiency, chlorophyll, carotenoids, and rapeseed oil color were all significantly positively correlated, and total polar phenols were significantly positively correlated with antioxidant power. In summary, early sowing at an appropriate date, reducing nitrogen fertilizer rate, and lowering planting density in production can improve the quality of pressed rapeseed oil. The findings of this study offer technical assistance to produce high-quality rapeseed oil raw materials. [ABSTRACT FROM AUTHOR]

After degradation of permafrost, the periodic freezing and melting in thawing areas will seriously damage the stability of oil pipelines. The 2D and 3D electrical resistivity tomography (ERT) are used respectively to detect the distribution and development status of permafrost in the buried area of crude oil pipelines. To further study the effectiveness of different exploration modes of ERT and resistivity response characteristics of permafrost, firstly, three models for unthawed, half-thawed and through-thawed permafrost are established in the space beneath the pipeline, and Earthlmager 2D and Earthlmager 3D software are applied for the forward modeling of finite element method and smoothness constrained least-squares inversion. On the basis of numerical simulation results, then, the resistivity response characteristics and differences of inversion results between the three models are compared and the exploration effects of 2D and 3D ERT are summarized. Finally, the results are further verified by exploration practice. The results show that the ERT is an effective method in permafrost survey. The detection effect of 2D ERT on the unthawed and through-thawed permafrost is better than on half-thawed permafrost. The data collected by 3D ERT is more abundant, the display of object morphology is more intuitive and precise, and the inversion results are closer to the theoretical model, which is suitable for permafrost of various melting states. The field examples further verify the numerical simulation results, and the application of 3D ERT also provides a new idea in the field of permafrost fine detection. [ABSTRACT FROM AUTHOR]

To identify favorable facies belt and high quality reservoir development area in northern Youfangzhuang area and expand the proved reserves in Ordos Basin, the paper studies the clastic particle composition and interstitial component of Chang 6 oil formation reservoir through various experimental means such as core thin section observation and mineral composition analysis with detailed experimental data. On this basis, the distribution rule of heavy and light minerals in Chang 6 reservoir is analyzed, and the indication significance of provenance and oil-gas coupling relation are discussed to supplement the scientific research results of reservoir petrology and provenance analysis in the area. The results show that Chang 6 sandstone reservoir is mainly feldspar sandstone, with minor lithic arkose. The interstitial materials are various in types and contents, including clay cement, carbonate cement and siliceous cement. The grains are mainly fine sand, sub-angular and above middle-level sorted. The cementation types are mainly film-pore, pore-film, pore, film and overgrowth-pore cementation. The standard deviation vs. average grain size diagram, heavy mineral association and light mineral composition of Chang 6 sandstone reservoir all indicate that the Chang 6 oil formation is mainly affected by the provenance from northeast, therefore the multi-stage superimposed delta front underwater distributary channel sand bodies are developed. Besides, the residual intergranular pores and feldspar dissolution pores are developed due to long distance transport. The mineral assemblage of feldspar, chlorite and kaolinite improves the physical properties of reservoir in the study area and increases the permeability of low resistivity reservoir. The underwater distributary channel reservoirs in Chang 61 and 62 oil formations are high quality reservoir development areas. [ABSTRACT FROM AUTHOR]

To evaluate the degree of unsaturation of different varieties of Camellia oil, it was necessary to establish a rapid evaluation method with a narrow iodine value range (iodine value difference less than 10). In this study, a rapid quantitative prediction model for iodine value of oil in high-resolution Raman spectroscopy based on linear regression and gradient descent method was established. The Raman signals (785 nm) about 39 group of Camellia oil samples and 10 group of commercially oils were firstly collected. Then, the intensity ratio of peaks of 1656 cm-1 and 1440 cm-1 (I1656/1440) were selected through smoothing algorithm least squares smoothing filter (Savitzky-Golay), polynomial fitting and deconvolution algorithm Lorentzian. A credible model was obtained through correlation analysis with the iodine value of corresponding oil samples. The coefficient of determination (R²) of the test set of the constructed quantitative model was >0.82, the mean square error (MSE) was <0.73 and the root mean square error (RMSE) was <0.85. This quantitative model of edible oil iodine value can accurately and efficiently predict the unsaturation degree of Camellia oil, etc. [ABSTRACT FROM AUTHOR]