The estimation of chronologic age based on the stages of third-molar development was evaluated by using the eight stages （A–H） method of Demirjian and the third-molar development was compared, in terms of sex and a...The estimation of chronologic age based on the stages of third-molar development was evaluated by using the eight stages （A–H） method of Demirjian and the third-molar development was compared, in terms of sex and age, with results of previous studies. The samples consisted of 291 orthopantomograms from young Chinese subjects of known chronologic age and sex （including 139 males with a mean age of 14.67±3.62 y and 152 females with a mean age of 14.85±3.70 y）. Statistical analysis was performed by employing the Mann-Whitney U-test and the t-test. Regression analysis was conducted to obtain regression formulas for calculating dental age from the chronologic age. Our results showed statistically significant differences （P〈0.05） in third-molar development between males and females, at the calcification stages D, E and H. And a strong correlation was found between age and third-molar development in both males （r2=0.65） and females （r2=0.61）. New equations （Age=8.76＋1.32 Development stage） for estimating chronologic age were derived. It is concluded that third-molar genesis took place earlier in males than in females. The use of third molars as a developmental marker is appropriate in young adults of Central China. The formula obtained in the present study can be used as a guide for estimation of dental maturity and a standard for age estimation for young adults of Central China.展开更多
Objective The western Qinling belongs to the western part of the Qinling-Dabie-Sulu orogen between the North China Block and South China Block. Multiple orogenic events might be responsible for different types of gold...Objective The western Qinling belongs to the western part of the Qinling-Dabie-Sulu orogen between the North China Block and South China Block. Multiple orogenic events might be responsible for different types of gold mineralization, making the western Qinling gold region one of the most important gold metallogenic belts in China. This region has demonstrated a total gold resource of 〉500 t and more than ten gold deposits with gold resource of 〉20 t. Almost all gold deposits in the western Qinling gold region can be classified into two distinct genetic types as orogenic （such as the Shuangwang,展开更多
Recent embryological evidence of studies of seedlings of Cupressus L.along with chemotaxonomic studies of heartwood components has demonstrated that Cupressus lusitanica Mill.did indeed originate from the country of I...Recent embryological evidence of studies of seedlings of Cupressus L.along with chemotaxonomic studies of heartwood components has demonstrated that Cupressus lusitanica Mill.did indeed originate from the country of India.In the mid-sixteenth century,Portuguese merchants established early trade routes between India and Portugal.The trade developed from the spice industry confirms Miller’s (1768) original description that Cupressus lusitanica did indeed originate from India.Later authors suggested that Cupressus lusitanica cultivated in Portugal was introduced from wild populations of Cupressus in Mexico.However,this latter theory was never accepted by native botanist in the country of Mexico,including noted botanist M.martinez (1948).In fact,all Cupressus species in India seem to have a different embryology than that of all Cupressus species in Nepal, Bhutan, China and Vietnam (Silba,1994).展开更多
Using a sample of 655 individuals from 15-year olds to 79-year olds, the present research found that teenagers want to be older than their age and older people above 20-24 want to be younger than their age. Furthermor...Using a sample of 655 individuals from 15-year olds to 79-year olds, the present research found that teenagers want to be older than their age and older people above 20-24 want to be younger than their age. Furthermore, life satisfaction has a major impact on the age people want to be in crises years, before the age of 40, 50, 60 and 70. Those with high life satisfaction more than those with low life satisfaction tend to have a more realistic ideal age, that is, closer to their actual age.展开更多
There have been conflicting ideas about the Indosinian mineralization in E. Xinjiang, a subject that has attracted many geologists' attention over a long period. Isotopic dating shows that the Shiyingtan gold depo...There have been conflicting ideas about the Indosinian mineralization in E. Xinjiang, a subject that has attracted many geologists' attention over a long period. Isotopic dating shows that the Shiyingtan gold deposit located on the southern margin of the Turpan-Hami basin has a quartz fluid inclusion Rb-Sr isochron age of 237±9 Ma (95% conf.); the Shuangfengshan gold deposit on the southern margin of the Junggar orogenic belt has a quartz fluid inclusion Rb-Sr isochron age of 226 ±21 Ma (95% conf.); the Weiya vanadium-titanium magnetite in the E. Tianshan mountains has a mineral-whole rock Sm-Nd isochron age of 220 ±30 Ma (95% conf.); the Jinwozi and Jinwozi 210 gold deposits in the E. Tianshan mountains have quartz fluid inclusion Rb-Sr isochron ages of 228±22 Ma (95% conf.) and 230±6 Ma (95% conf.), respectively; and the Xiaobaishitouquan scheelite deposit in the E. Tianshan mountains has a quartz fluid inclusion Rb-Sr isochron age of 248±7 Ma (95% conf.). The metallogenetic ages mentioned above prove the existence of Indosinian mineralization in E. Xinjiang, and the metallogenetic event might have been related to Triassic intraplate magmatic evolution, intra-continent subduction, strike-slip shoving and ductile shearing in the studied area, representing another mineralization peak after the Late Paleozoic.展开更多
The term Jingluo,translated as meridian or channel,is a core component of traditional Chinese medicine(TCM)and has played a fundamental role in guiding the clinical practice of acupuncture for thousands of years.Howev...The term Jingluo,translated as meridian or channel,is a core component of traditional Chinese medicine(TCM)and has played a fundamental role in guiding the clinical practice of acupuncture for thousands of years.However,the essence of the meridian remains elusive and is a source of both confusion and debate for researchers.In this study,a“4 D”systemic view on the essence of the meridian,namely substantial,functional,chronological,and cultural dimensions,was proposed based on a review of the ancient medical classics,recent research developments,and results from clinical practice.Previous studies have primarily focused on the substantial dimension of the meridian system,with scant interpretation about its functional domain.Neither systemic data nor evaluations have been adequately documented.Additionally,a limited but increasing number of studies have focused on the chronological and cultural dimensions.More investigations that embody the holistic concept of TCM and integrate the systemic modes and advanced techniques with dominant diseases of TCM need to be performed to obtain a more comprehensive understanding of the essence of meridians.The goal of this study is to yield useful information in understanding the essence of meridians and provide a reference and perspective for further research.展开更多
: Using the single—zircon evaporation technique and U—Pb method, the authors have conducted an isotope geochonological study of the Huilanshan granulite and Shima garnet-bearing plagioclase gneiss (“country rocks”...: Using the single—zircon evaporation technique and U—Pb method, the authors have conducted an isotope geochonological study of the Huilanshan granulite and Shima garnet-bearing plagioclase gneiss (“country rocks” of the Shima eclogite) in the Dabie Mountains. The study shows that these rocks have peak metamorphic ages of 443–455 Ma, which are essentially consistent with that of the Caledonian high—ultrahigh pressure eclogites. This indicates the existence of the Caledonian collisional orogeny in the Dabie Mountains.展开更多
Since their discovery in 2011,MXenes,two-dimensional transition metal carbides and nitrides,have emerged as highly promising materials for smart textile applications.They offer exceptional properties such as high elec...Since their discovery in 2011,MXenes,two-dimensional transition metal carbides and nitrides,have emerged as highly promising materials for smart textile applications.They offer exceptional properties such as high electrical conductivity,optical tunability,and mechanical flexibility.These materials can also be produced at scale and readily solution-processed into textile formats,fueling a surge of interest in integrating MXenes into various smart textile applications,from strain sensors and wearable biosensors to adaptive thermal management and electromagnetic interference(EMI)shielding.However,despite this rapid growth,existing reviews of MXene-enabled smart textiles remain narrow in scope,often focusing on single fabrication methods or specific functionalities.Such a fragmented perspective makes it difficult for researchers to gain a comprehensive understanding of how the field has evolved and where it is headed.In response,we present a quantitative bibliographic analysis of MXene–textile research from 2017 through 2024,encompassing nearly 1000 publications.This review categorizes the literature by major functional domains(sensing,energy storage/harvesting,EMI shielding,and heating)and examines their shifts over time,providing reasons and examples for these changes in research interest.Additionally,detailed analyses of functions in each category were conducted in a similar fashion.Our holistic,data-driven assessment offers guidance for future research and commercialization of MXene-functionalized smart textiles by identifying high-impact areas,emerging opportunities,and critical gaps.展开更多
The discovery of granite gravel in Hefei Jurassic backland basin, which came from the Dabie Shan or North Huaiyang, has a great significance for probing into uplift and exhumation of the Dabie orogenic belt. Litho-che...The discovery of granite gravel in Hefei Jurassic backland basin, which came from the Dabie Shan or North Huaiyang, has a great significance for probing into uplift and exhumation of the Dabie orogenic belt. Litho-chemical and isotope chronological analyses on the granite gravel in the Sanjianpu Formation and the Fenghuangtai Formation in Jinzhai County prove that post-orogenic granite was developed in the major provenance of the Hefei Basin; that is, Dabie Shan or North Huaiyang. Discordant lower intersection point age of zircon U-Pb of granite gravel is about 214 Ma, and 40Ar/39Ar age of muscovite about 196 Ma, K-Ar age of K-spar about 181 Ma. The former is the diagenetic age of the sample, and the latter two represent the sealed ages of muscovite and K-spar respectively. The age of sedimentary rocks in which a lot of granite gravels appear in the sedimentary section may represent the newest age of the exhumation of the granite body, so we assume that the age is 166 Ma. Therefore, we calculated the展开更多
Ⅰ. INTRODUCTIONProfessor Pei Wen-zhong (W. C. Pei )discovered the first skull of Peking Man in December of 1929 at Zhoukoudian, 48 km from Beijing. But unfortunately, we do not know the burial age of this skull exact...Ⅰ. INTRODUCTIONProfessor Pei Wen-zhong (W. C. Pei )discovered the first skull of Peking Man in December of 1929 at Zhoukoudian, 48 km from Beijing. But unfortunately, we do not know the burial age of this skull exactly up to now.展开更多
It is well known that, when studying the metallogenic epochs of tungsten deposits, the predecessors generally used rocks related to metallization or alteration minerals coexisting with tungsten veins as the dating mat...It is well known that, when studying the metallogenic epochs of tungsten deposits, the predecessors generally used rocks related to metallization or alteration minerals coexisting with tungsten veins as the dating materials whose isotopic ages can, in most cases, reflect only the forming ages of wallrocks or primary rocks or crystallization time of minerals and then they speculate indirectly about the mineralization epochs of ore deposits. With Rb-Sr and Sm-Nd isochron technique, T. J. Shepherd et al. respectively展开更多
Granitoid gravels are discovered from alluvial fan conglomerates, the base of Jurassic Fenghuangtai Formation (J22), in the north margin of Dabie block and the south part of the Hefei Basin. These granitoid gravels ma...Granitoid gravels are discovered from alluvial fan conglomerates, the base of Jurassic Fenghuangtai Formation (J22), in the north margin of Dabie block and the south part of the Hefei Basin. These granitoid gravels make up 5%-10% of all gravels by volume percent. For the four components, K-feldspar, biotite, amphibole and whole rock divided from two selected granitoid gravel samples, their Rb-Sr isotopes are measured, which gives two formation ages of granitoids: (428±20) Ma and (430±54) Ma, and means that the Early Paleozoic granitoid intrusive rocks once existed in the Dabie Mountain provenances of Jurassic. The granitoids occur in the tectonic setting of post-collision upliftaccording to lithogeochemical discriminant analysis.展开更多
This paper reviews the studies on the event that King Wu of the Western Zhou Dynasty defeated King Zhou of the late Shang Dynasty, an important historical event in Chinese history, and questions on the year in which t...This paper reviews the studies on the event that King Wu of the Western Zhou Dynasty defeated King Zhou of the late Shang Dynasty, an important historical event in Chinese history, and questions on the year in which this event took place determined by researchers of the Xia-Shang-Zhou Chronology Project of China in 2000. This paper also discusses on how to obtain primordial materials and how to use astronomical methods in the chronological studies of Chinese history. With both the new astronomical methods (the Moon Age Calendar Method and the Direct Solving Method) and the calculation based on the confirmed real-time materials, especially scriptures on oracle bones and bronze vessels, this paper obtains a more accurate and reliable result, putting the event at BC 1040 to BC 1030.展开更多
Benefited from the performance of the Xia-Shang-Zhou Chronology Project(XSZP) in China and our new astronomical chronology method designed and processed for Chinese particular 60-day-cycle Ganzhi(the heavenly stems an...Benefited from the performance of the Xia-Shang-Zhou Chronology Project(XSZP) in China and our new astronomical chronology method designed and processed for Chinese particular 60-day-cycle Ganzhi(the heavenly stems and earthly branches)date records,we launch a Date Recovery System(DRS)for ancient China. Of high analysis function,this software can recover and convert the complete or incomplete date information originally from Ganzhi style in the historical period of China to the Gregorian Calendar System,which may have wide applications in the area of literary history,archaeology and cultural relic,etc.,and solve the Goldbach Puzzles of Chinese nations.As an example,we give the detailed process for the sculptures on four bronze wares with the Ganzhi data and afterwards employ this software and provide their possible dates corresponding to Gregorian system.展开更多
Cenozoic trachytes are characteristic of some active volcanic fields in China.In particular,the origin and mechanisms of the evolution of trachytes from the Tianchi(Changbaishan)volcano(TV,China/North Korea)are poorly...Cenozoic trachytes are characteristic of some active volcanic fields in China.In particular,the origin and mechanisms of the evolution of trachytes from the Tianchi(Changbaishan)volcano(TV,China/North Korea)are poorly known.Here,we present new geochronological,geochemical and isotopic data on two trachytic suites outcropping on the northern and southern upper slopes of TV.Detailed zircon laser ablation-multicollector-inductively coupled plasma-mass spectrometry(LA-MC-ICP-MS)U-Pb dating,Rb-Sr isochron dating of plagioclase and hornblende,^(40)Ar/^(39)Ar chronology with mineral chemistry,whole-rock element and Sr-Nd-Pb isotope data are used to explore their origins and evolutionary mechanisms during the late Middle Pleistocene.Our data indicate that the trachytes mainly consist of sanidine,orthoclase and plagioclase,with minor albite,quartz and hornblende.They formed at 0.353-0.346 Ma(lava flow from the northern slope)and 0.383-0.311 Ma(lava flow from the southern slope),respectively.The TV trachytes are characterized by high K_(2)O/Na_(2)O and AR values,with low A/CNK and Mg~#values.They are enriched in rare earth elements(REEs;except Eu),depleted in Sr and Ba,crystallizing at 742-858℃.The TV trachytes have high(^(87)Sr/^(86)Sr)_i values(0.70776-0.71195),positiveε_(Nd)(t)values(0.61-2.93)and radiogenic^(206)Pb/^(204)Pb values(17.515-17.806).These values are similar to those of the Pleistocene and Holocene TV trachytes.Geochemical data indicate that they were formed by fractional crystallization from a basaltic melt and assimilated upper crust material.The trace element pattern of the studied trachytes is consistent with an evolution from basaltic melts representative of an enriched mantle source.The vent from which the trachytic magma was erupted probably collapsed inside the caldera during the TV'Millennium'eruption(ME)in 946 AD.The contemporaneous emission of basaltic and trachytic magma during the Middle-Late Pleistocene suggests the coexistence of fissural basaltic volcanism and central-type trachytic volcanism,the latter of which was associated with a magma chamber in the upper crust during the TV cone-construction stage.展开更多
The Ning-Wu Basin is an important part of the Middle-Lower Yangtze River Metallogenic Belt in eastern China.It contains well-preserved Mesozoic volcanic sequences that document significant geodynamic evolution.However...The Ning-Wu Basin is an important part of the Middle-Lower Yangtze River Metallogenic Belt in eastern China.It contains well-preserved Mesozoic volcanic sequences that document significant geodynamic evolution.However,uncertainties surrounding the ages of eruptions and the temporal relationships between the four main volcanic cycles—the Longwangshan,Dawangshan,Gushan and Niangniangshan formations—have hindered our understanding of magmatic pulsation and its connection to iron mineralisation.Here,high-precision LA-ICP-MS zircon U-Pb dating of four fresh volcanic samples(one per formation)reveals weighted mean ages of 132.3±1.0 Ma(Longwangshan;MSWD=1.3),130.4±1.6 Ma(Dawangshan;MSWD=1.3),128.1±1.9 Ma(Gushan;MSWD=2.0)and 127.2±1.1 Ma(Niangniangshan;MSWD=0.23).These dates constrain volcanic activity to the Early Cretaceous Valanginian-Hauterivian interval and show a systematic trend of increasingly younger ages spanning~8 Ma(133-125 Ma).This magmatism can be subdivided into three phases:initiation(133-132 Ma),peak activity(132-130 Ma)and cessation(128-125 Ma).The episodic volcanism correlates with the accelerating rollback of the Pacific subduction zone,which drives crustal melting and asthenospheric upwelling.Notably,these cycles supplied the thermal energy,fluids and iron-rich melts that were essential for the formation of porphyritic iron deposits in the basin.By establishing a highresolution chronostratigraphic framework,this study sheds light on the spatiotemporal evolution of the Ning-Wu Basin,elucidating the coupling between crust-mantle dynamics,volcanic cyclicity and ore-forming processes across eastern China’s metallogenic belt.展开更多
The Tong’an-Baishuidong mining district(TBMD),located in the eastern section of the Jiangnan Orogen,is a newly discovered granite-type lithium mining district.Thisstudy presents new monazite U-Pb chronological,whole-...The Tong’an-Baishuidong mining district(TBMD),located in the eastern section of the Jiangnan Orogen,is a newly discovered granite-type lithium mining district.Thisstudy presents new monazite U-Pb chronological,whole-rock geochemical,and Nd-Pb isotopic data to reveal the petrogenesis and geodynamic setting of the Wutang granites in the TBMD.The monazite U-Pb age of 145.8±1.0 Ma indicates that the granites were emplaced at the end of the Late Jurassic.Whole-rock geochemical results demonstrate that the Wutang granites are enriched in SiO_(2)(72.80-73.40 wt%)but depleted in CaO(0.44-0.90 wt%)and MgO+TiO_(2)+TFeO(1.79-2.05 wt%).These granites exhibit negative Eu anomalies(δEu=0.3−0.4)and high aluminum saturation indexes(A/CNK=1.2−1.6),differentiation indexes(DI=90-92),and Rb/Sr ratios(4.7-8.1).They also have moderate Ba contents(239-278 ppm)and low Sr contents(52.7-82.0 ppm)as well as low Nb/Ta(2.2-5.3)and Zr/Hf(21.3-31.5)ratios.All these indicate that they are highly fractionated granites.Additionally,these granites contain 5-10 wt%muscovite but no hornblende,with calculated corundum contents of 2.3-5.5 wt%.They have low high-field strength element(HFSE)contents(Zr+Nb+Ce+Y=182-202 ppm)and zircon saturation temperatures(700-770℃),with Th and Y negatively linked with Rb.These petrographic and geochemi-cal features further reveal that the Wutang granites belong to highly fractionated S-type granites.TheεNd(t)values of these granites range from−9.03 to−8.23,corresponding to two-stage model ages(T DM2)of 1488-1553 Ma.The initial Pb isotope ratios are:(206 Pb/^(204)Pb)i=18.38-18.55,(^(207)Pb/^(204)Pb)i=15.67-15.68,and(^(208)Pb/^(204)Pb)i=38.62-38.67.These Nd-Pb isotopic results demonstrate that the parental magma originated from the partial melting of ancient crustal materials.In the meantime,the TBMD in the eastern section of the Jiangnan Orogen was in a compression-extension transitional setting associated with the episodic subduction of the Paleo-Pacific Plate.展开更多
A huge thrust system, the North Lhasa Thrust (NLT), was discovered in the northern Lhasa block of the Tibetan Plateau based on geological mapping of the Damxung region and its vicinity, the Deqen-Lunpola traverse and ...A huge thrust system, the North Lhasa Thrust (NLT), was discovered in the northern Lhasa block of the Tibetan Plateau based on geological mapping of the Damxung region and its vicinity, the Deqen-Lunpola traverse and the Amdo-Bam Co profile. The NLT consists of the Dongqiao-Lunpola thrust (DLT), the west Namco thrust (WNT) and the south Damxung thrust (SDT) and ductile shear zones, ophiolite slices and folds extending in a WNW direction. Major thrust faults of the NLT seem to merge into a single deep-seated detachment of the upper-crust and totally displaced southward as far as 100-120 km. Chronological analyses with 39Ar-40Ar of plagioclase and hornblende, Rb-Sr isochron of minerals and fission-tracks of apatite from mylonite within the WNT yield ages of 174-173 Ma, 109 Ma and 44 Ma, showing 3 periods of thrusting in the north Lhasa block caused by subduction of the Tethys oceanic plate and the India-Eurasia continental collision respectively.展开更多
AIM To investigate the clinical utility of biological age(BA) measurement in screening colonoscopy for the detection of colorectal adenomas in the average-risk population.METHODS A consecutive series of asymptomatic s...AIM To investigate the clinical utility of biological age(BA) measurement in screening colonoscopy for the detection of colorectal adenomas in the average-risk population.METHODS A consecutive series of asymptomatic subjects aged ≥ 30 years who underwent colonoscopy in routine check-ups were enrolled. Colorectal adenoma was classified according to size, number, and location. BAs were calculated using the MEDIAGETM Biological Age Measurement System.RESULTS A total of 2696 subjects were investigated(1876 men and 820 women). The mean chronological age(CA) was 46.0 years and the mean BA was 44.7 years. Metabolic syndrome(MS) was diagnosed in 218 subjects(8.1%). The prevalence of overall colorectal adenoma was 23.1%(622/2,696). When the subjects were divided into four groups based on BA(≤ 39 years; 40-49 years; 50-59 years; ≥ 60 years), the prevalence of colorectal adenoma was increased as BA increased(P < 0.001). Colorectal adenoma located in the proximal colon was more prevalent in the BA-dominant group(BA-CA ≥ 5years) than the CA-dominant group(CA-BA ≥ 5 years)(P = 0.034). When the subjects were categorized into four groups according to MS and age gap between BA and CA, the incidence of colorectal adenoma increased with MS and BA-dominance(P < 0.05).CONCLUSION Measurement of BA may help to assess the risk of colorectal adenoma in screening colonoscopy.展开更多
文摘The estimation of chronologic age based on the stages of third-molar development was evaluated by using the eight stages （A–H） method of Demirjian and the third-molar development was compared, in terms of sex and age, with results of previous studies. The samples consisted of 291 orthopantomograms from young Chinese subjects of known chronologic age and sex （including 139 males with a mean age of 14.67±3.62 y and 152 females with a mean age of 14.85±3.70 y）. Statistical analysis was performed by employing the Mann-Whitney U-test and the t-test. Regression analysis was conducted to obtain regression formulas for calculating dental age from the chronologic age. Our results showed statistically significant differences （P〈0.05） in third-molar development between males and females, at the calcification stages D, E and H. And a strong correlation was found between age and third-molar development in both males （r2=0.65） and females （r2=0.61）. New equations （Age=8.76＋1.32 Development stage） for estimating chronologic age were derived. It is concluded that third-molar genesis took place earlier in males than in females. The use of third molars as a developmental marker is appropriate in young adults of Central China. The formula obtained in the present study can be used as a guide for estimation of dental maturity and a standard for age estimation for young adults of Central China.
基金financially supported by the National Natural Science Foundation of China(grants No. 41573036 and 41030423)the Xiangtanzi Gold Deposit Prospecting Program of the Zhaojin Mining Industry Company Limited(3-4-2016-061)
文摘Objective The western Qinling belongs to the western part of the Qinling-Dabie-Sulu orogen between the North China Block and South China Block. Multiple orogenic events might be responsible for different types of gold mineralization, making the western Qinling gold region one of the most important gold metallogenic belts in China. This region has demonstrated a total gold resource of 〉500 t and more than ten gold deposits with gold resource of 〉20 t. Almost all gold deposits in the western Qinling gold region can be classified into two distinct genetic types as orogenic （such as the Shuangwang,
文摘Recent embryological evidence of studies of seedlings of Cupressus L.along with chemotaxonomic studies of heartwood components has demonstrated that Cupressus lusitanica Mill.did indeed originate from the country of India.In the mid-sixteenth century,Portuguese merchants established early trade routes between India and Portugal.The trade developed from the spice industry confirms Miller’s (1768) original description that Cupressus lusitanica did indeed originate from India.Later authors suggested that Cupressus lusitanica cultivated in Portugal was introduced from wild populations of Cupressus in Mexico.However,this latter theory was never accepted by native botanist in the country of Mexico,including noted botanist M.martinez (1948).In fact,all Cupressus species in India seem to have a different embryology than that of all Cupressus species in Nepal, Bhutan, China and Vietnam (Silba,1994).
文摘Using a sample of 655 individuals from 15-year olds to 79-year olds, the present research found that teenagers want to be older than their age and older people above 20-24 want to be younger than their age. Furthermore, life satisfaction has a major impact on the age people want to be in crises years, before the age of 40, 50, 60 and 70. Those with high life satisfaction more than those with low life satisfaction tend to have a more realistic ideal age, that is, closer to their actual age.
基金China's National Key Basic Research Project(No.200ICB409810) China's National Scientific and Technical Project"Compositive Research of Exploration of Preponderant Metallic Resources in Xinjiang”(No.2001BA609A-07-18).
文摘There have been conflicting ideas about the Indosinian mineralization in E. Xinjiang, a subject that has attracted many geologists' attention over a long period. Isotopic dating shows that the Shiyingtan gold deposit located on the southern margin of the Turpan-Hami basin has a quartz fluid inclusion Rb-Sr isochron age of 237±9 Ma (95% conf.); the Shuangfengshan gold deposit on the southern margin of the Junggar orogenic belt has a quartz fluid inclusion Rb-Sr isochron age of 226 ±21 Ma (95% conf.); the Weiya vanadium-titanium magnetite in the E. Tianshan mountains has a mineral-whole rock Sm-Nd isochron age of 220 ±30 Ma (95% conf.); the Jinwozi and Jinwozi 210 gold deposits in the E. Tianshan mountains have quartz fluid inclusion Rb-Sr isochron ages of 228±22 Ma (95% conf.) and 230±6 Ma (95% conf.), respectively; and the Xiaobaishitouquan scheelite deposit in the E. Tianshan mountains has a quartz fluid inclusion Rb-Sr isochron age of 248±7 Ma (95% conf.). The metallogenetic ages mentioned above prove the existence of Indosinian mineralization in E. Xinjiang, and the metallogenetic event might have been related to Triassic intraplate magmatic evolution, intra-continent subduction, strike-slip shoving and ductile shearing in the studied area, representing another mineralization peak after the Late Paleozoic.
基金supported by funding from Zhejiang Provincial Planned Project of Philosophy and Social Sciences(No.20NDJC118YB)the Key National Social Science Fund of China(No.18ZDA322)+2 种基金the National Social Science Fund of China(No.19XXW005)the International Cooperation and Exchange Project of Sichuan Provincial Science and Technology Department(No.2017HH0004)Social Science Fund for Universities of Sichuan Province(No.2021XT17)。
文摘The term Jingluo,translated as meridian or channel,is a core component of traditional Chinese medicine(TCM)and has played a fundamental role in guiding the clinical practice of acupuncture for thousands of years.However,the essence of the meridian remains elusive and is a source of both confusion and debate for researchers.In this study,a“4 D”systemic view on the essence of the meridian,namely substantial,functional,chronological,and cultural dimensions,was proposed based on a review of the ancient medical classics,recent research developments,and results from clinical practice.Previous studies have primarily focused on the substantial dimension of the meridian system,with scant interpretation about its functional domain.Neither systemic data nor evaluations have been adequately documented.Additionally,a limited but increasing number of studies have focused on the chronological and cultural dimensions.More investigations that embody the holistic concept of TCM and integrate the systemic modes and advanced techniques with dominant diseases of TCM need to be performed to obtain a more comprehensive understanding of the essence of meridians.The goal of this study is to yield useful information in understanding the essence of meridians and provide a reference and perspective for further research.
基金This study was supported by the National Natural Science Foundation of China grants 49572146 and 49772147 and the Foundation for Development of Science and Technology in Geology grant 9514.
文摘: Using the single—zircon evaporation technique and U—Pb method, the authors have conducted an isotope geochonological study of the Huilanshan granulite and Shima garnet-bearing plagioclase gneiss (“country rocks” of the Shima eclogite) in the Dabie Mountains. The study shows that these rocks have peak metamorphic ages of 443–455 Ma, which are essentially consistent with that of the Caledonian high—ultrahigh pressure eclogites. This indicates the existence of the Caledonian collisional orogeny in the Dabie Mountains.
文摘Since their discovery in 2011,MXenes,two-dimensional transition metal carbides and nitrides,have emerged as highly promising materials for smart textile applications.They offer exceptional properties such as high electrical conductivity,optical tunability,and mechanical flexibility.These materials can also be produced at scale and readily solution-processed into textile formats,fueling a surge of interest in integrating MXenes into various smart textile applications,from strain sensors and wearable biosensors to adaptive thermal management and electromagnetic interference(EMI)shielding.However,despite this rapid growth,existing reviews of MXene-enabled smart textiles remain narrow in scope,often focusing on single fabrication methods or specific functionalities.Such a fragmented perspective makes it difficult for researchers to gain a comprehensive understanding of how the field has evolved and where it is headed.In response,we present a quantitative bibliographic analysis of MXene–textile research from 2017 through 2024,encompassing nearly 1000 publications.This review categorizes the literature by major functional domains(sensing,energy storage/harvesting,EMI shielding,and heating)and examines their shifts over time,providing reasons and examples for these changes in research interest.Additionally,detailed analyses of functions in each category were conducted in a similar fashion.Our holistic,data-driven assessment offers guidance for future research and commercialization of MXene-functionalized smart textiles by identifying high-impact areas,emerging opportunities,and critical gaps.
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 49772119 and 49732080).
文摘The discovery of granite gravel in Hefei Jurassic backland basin, which came from the Dabie Shan or North Huaiyang, has a great significance for probing into uplift and exhumation of the Dabie orogenic belt. Litho-chemical and isotope chronological analyses on the granite gravel in the Sanjianpu Formation and the Fenghuangtai Formation in Jinzhai County prove that post-orogenic granite was developed in the major provenance of the Hefei Basin; that is, Dabie Shan or North Huaiyang. Discordant lower intersection point age of zircon U-Pb of granite gravel is about 214 Ma, and 40Ar/39Ar age of muscovite about 196 Ma, K-Ar age of K-spar about 181 Ma. The former is the diagenetic age of the sample, and the latter two represent the sealed ages of muscovite and K-spar respectively. The age of sedimentary rocks in which a lot of granite gravels appear in the sedimentary section may represent the newest age of the exhumation of the granite body, so we assume that the age is 166 Ma. Therefore, we calculated the
文摘Ⅰ. INTRODUCTIONProfessor Pei Wen-zhong (W. C. Pei )discovered the first skull of Peking Man in December of 1929 at Zhoukoudian, 48 km from Beijing. But unfortunately, we do not know the burial age of this skull exactly up to now.
文摘It is well known that, when studying the metallogenic epochs of tungsten deposits, the predecessors generally used rocks related to metallization or alteration minerals coexisting with tungsten veins as the dating materials whose isotopic ages can, in most cases, reflect only the forming ages of wallrocks or primary rocks or crystallization time of minerals and then they speculate indirectly about the mineralization epochs of ore deposits. With Rb-Sr and Sm-Nd isochron technique, T. J. Shepherd et al. respectively
基金This work was supported by theMajor Project of the CAS (Grant No. KZ951-A1-401-07) and the Knowledge Innovation Project of the CAS (Grant No. KZCX1-07).
文摘Granitoid gravels are discovered from alluvial fan conglomerates, the base of Jurassic Fenghuangtai Formation (J22), in the north margin of Dabie block and the south part of the Hefei Basin. These granitoid gravels make up 5%-10% of all gravels by volume percent. For the four components, K-feldspar, biotite, amphibole and whole rock divided from two selected granitoid gravel samples, their Rb-Sr isotopes are measured, which gives two formation ages of granitoids: (428±20) Ma and (430±54) Ma, and means that the Early Paleozoic granitoid intrusive rocks once existed in the Dabie Mountain provenances of Jurassic. The granitoids occur in the tectonic setting of post-collision upliftaccording to lithogeochemical discriminant analysis.
基金This work was supported by the National Natural Science Foundation of China (Grant No.19973011)
文摘This paper reviews the studies on the event that King Wu of the Western Zhou Dynasty defeated King Zhou of the late Shang Dynasty, an important historical event in Chinese history, and questions on the year in which this event took place determined by researchers of the Xia-Shang-Zhou Chronology Project of China in 2000. This paper also discusses on how to obtain primordial materials and how to use astronomical methods in the chronological studies of Chinese history. With both the new astronomical methods (the Moon Age Calendar Method and the Direct Solving Method) and the calculation based on the confirmed real-time materials, especially scriptures on oracle bones and bronze vessels, this paper obtains a more accurate and reliable result, putting the event at BC 1040 to BC 1030.
基金Supported by the Tianyuan Foundation of China(Grant No.A0324673)
文摘Benefited from the performance of the Xia-Shang-Zhou Chronology Project(XSZP) in China and our new astronomical chronology method designed and processed for Chinese particular 60-day-cycle Ganzhi(the heavenly stems and earthly branches)date records,we launch a Date Recovery System(DRS)for ancient China. Of high analysis function,this software can recover and convert the complete or incomplete date information originally from Ganzhi style in the historical period of China to the Gregorian Calendar System,which may have wide applications in the area of literary history,archaeology and cultural relic,etc.,and solve the Goldbach Puzzles of Chinese nations.As an example,we give the detailed process for the sculptures on four bronze wares with the Ganzhi data and afterwards employ this software and provide their possible dates corresponding to Gregorian system.
基金financially supported by the project of the National Observation and Research Station of the Institute of Geology,China Earthquake Administration(Grant No.NORSCBS22-06)the Youth Science and Technology Development Project of the Jilin Earthquake Agency(Grant No.JZQ-202402)+1 种基金the Earthquake Science and Technology Spark Project(Grant No.XH23013B)the China Scholarship Council(Grant No.202104190014)。
文摘Cenozoic trachytes are characteristic of some active volcanic fields in China.In particular,the origin and mechanisms of the evolution of trachytes from the Tianchi(Changbaishan)volcano(TV,China/North Korea)are poorly known.Here,we present new geochronological,geochemical and isotopic data on two trachytic suites outcropping on the northern and southern upper slopes of TV.Detailed zircon laser ablation-multicollector-inductively coupled plasma-mass spectrometry(LA-MC-ICP-MS)U-Pb dating,Rb-Sr isochron dating of plagioclase and hornblende,^(40)Ar/^(39)Ar chronology with mineral chemistry,whole-rock element and Sr-Nd-Pb isotope data are used to explore their origins and evolutionary mechanisms during the late Middle Pleistocene.Our data indicate that the trachytes mainly consist of sanidine,orthoclase and plagioclase,with minor albite,quartz and hornblende.They formed at 0.353-0.346 Ma(lava flow from the northern slope)and 0.383-0.311 Ma(lava flow from the southern slope),respectively.The TV trachytes are characterized by high K_(2)O/Na_(2)O and AR values,with low A/CNK and Mg~#values.They are enriched in rare earth elements(REEs;except Eu),depleted in Sr and Ba,crystallizing at 742-858℃.The TV trachytes have high(^(87)Sr/^(86)Sr)_i values(0.70776-0.71195),positiveε_(Nd)(t)values(0.61-2.93)and radiogenic^(206)Pb/^(204)Pb values(17.515-17.806).These values are similar to those of the Pleistocene and Holocene TV trachytes.Geochemical data indicate that they were formed by fractional crystallization from a basaltic melt and assimilated upper crust material.The trace element pattern of the studied trachytes is consistent with an evolution from basaltic melts representative of an enriched mantle source.The vent from which the trachytic magma was erupted probably collapsed inside the caldera during the TV'Millennium'eruption(ME)in 946 AD.The contemporaneous emission of basaltic and trachytic magma during the Middle-Late Pleistocene suggests the coexistence of fissural basaltic volcanism and central-type trachytic volcanism,the latter of which was associated with a magma chamber in the upper crust during the TV cone-construction stage.
基金supported by The Special Funds for Natural Resource Development in Jiangsu Province(2200113-35)The Central Financial Geological Survey Project of the China Geological Survey(DD20230800702).
文摘The Ning-Wu Basin is an important part of the Middle-Lower Yangtze River Metallogenic Belt in eastern China.It contains well-preserved Mesozoic volcanic sequences that document significant geodynamic evolution.However,uncertainties surrounding the ages of eruptions and the temporal relationships between the four main volcanic cycles—the Longwangshan,Dawangshan,Gushan and Niangniangshan formations—have hindered our understanding of magmatic pulsation and its connection to iron mineralisation.Here,high-precision LA-ICP-MS zircon U-Pb dating of four fresh volcanic samples(one per formation)reveals weighted mean ages of 132.3±1.0 Ma(Longwangshan;MSWD=1.3),130.4±1.6 Ma(Dawangshan;MSWD=1.3),128.1±1.9 Ma(Gushan;MSWD=2.0)and 127.2±1.1 Ma(Niangniangshan;MSWD=0.23).These dates constrain volcanic activity to the Early Cretaceous Valanginian-Hauterivian interval and show a systematic trend of increasingly younger ages spanning~8 Ma(133-125 Ma).This magmatism can be subdivided into three phases:initiation(133-132 Ma),peak activity(132-130 Ma)and cessation(128-125 Ma).The episodic volcanism correlates with the accelerating rollback of the Pacific subduction zone,which drives crustal melting and asthenospheric upwelling.Notably,these cycles supplied the thermal energy,fluids and iron-rich melts that were essential for the formation of porphyritic iron deposits in the basin.By establishing a highresolution chronostratigraphic framework,this study sheds light on the spatiotemporal evolution of the Ning-Wu Basin,elucidating the coupling between crust-mantle dynamics,volcanic cyclicity and ore-forming processes across eastern China’s metallogenic belt.
基金funded by the Program of Science and Technology Department of Jiangxi Province(2023KDG01002 and 2023KDG01003)the National Natural Science Foundation of China(42062006 and 41962007)+1 种基金the Key Research and Development Program of Jiangxi Province(20223BBG71015)the Personnel Training Project of Jiangxi Bureau of Geology(2023JXDZKJRC02,2022JXDZKJRC04,and 2024JXDZKJRC05).
文摘The Tong’an-Baishuidong mining district(TBMD),located in the eastern section of the Jiangnan Orogen,is a newly discovered granite-type lithium mining district.Thisstudy presents new monazite U-Pb chronological,whole-rock geochemical,and Nd-Pb isotopic data to reveal the petrogenesis and geodynamic setting of the Wutang granites in the TBMD.The monazite U-Pb age of 145.8±1.0 Ma indicates that the granites were emplaced at the end of the Late Jurassic.Whole-rock geochemical results demonstrate that the Wutang granites are enriched in SiO_(2)(72.80-73.40 wt%)but depleted in CaO(0.44-0.90 wt%)and MgO+TiO_(2)+TFeO(1.79-2.05 wt%).These granites exhibit negative Eu anomalies(δEu=0.3−0.4)and high aluminum saturation indexes(A/CNK=1.2−1.6),differentiation indexes(DI=90-92),and Rb/Sr ratios(4.7-8.1).They also have moderate Ba contents(239-278 ppm)and low Sr contents(52.7-82.0 ppm)as well as low Nb/Ta(2.2-5.3)and Zr/Hf(21.3-31.5)ratios.All these indicate that they are highly fractionated granites.Additionally,these granites contain 5-10 wt%muscovite but no hornblende,with calculated corundum contents of 2.3-5.5 wt%.They have low high-field strength element(HFSE)contents(Zr+Nb+Ce+Y=182-202 ppm)and zircon saturation temperatures(700-770℃),with Th and Y negatively linked with Rb.These petrographic and geochemi-cal features further reveal that the Wutang granites belong to highly fractionated S-type granites.TheεNd(t)values of these granites range from−9.03 to−8.23,corresponding to two-stage model ages(T DM2)of 1488-1553 Ma.The initial Pb isotope ratios are:(206 Pb/^(204)Pb)i=18.38-18.55,(^(207)Pb/^(204)Pb)i=15.67-15.68,and(^(208)Pb/^(204)Pb)i=38.62-38.67.These Nd-Pb isotopic results demonstrate that the parental magma originated from the partial melting of ancient crustal materials.In the meantime,the TBMD in the eastern section of the Jiangnan Orogen was in a compression-extension transitional setting associated with the episodic subduction of the Paleo-Pacific Plate.
文摘A huge thrust system, the North Lhasa Thrust (NLT), was discovered in the northern Lhasa block of the Tibetan Plateau based on geological mapping of the Damxung region and its vicinity, the Deqen-Lunpola traverse and the Amdo-Bam Co profile. The NLT consists of the Dongqiao-Lunpola thrust (DLT), the west Namco thrust (WNT) and the south Damxung thrust (SDT) and ductile shear zones, ophiolite slices and folds extending in a WNW direction. Major thrust faults of the NLT seem to merge into a single deep-seated detachment of the upper-crust and totally displaced southward as far as 100-120 km. Chronological analyses with 39Ar-40Ar of plagioclase and hornblende, Rb-Sr isochron of minerals and fission-tracks of apatite from mylonite within the WNT yield ages of 174-173 Ma, 109 Ma and 44 Ma, showing 3 periods of thrusting in the north Lhasa block caused by subduction of the Tethys oceanic plate and the India-Eurasia continental collision respectively.
文摘AIM To investigate the clinical utility of biological age(BA) measurement in screening colonoscopy for the detection of colorectal adenomas in the average-risk population.METHODS A consecutive series of asymptomatic subjects aged ≥ 30 years who underwent colonoscopy in routine check-ups were enrolled. Colorectal adenoma was classified according to size, number, and location. BAs were calculated using the MEDIAGETM Biological Age Measurement System.RESULTS A total of 2696 subjects were investigated(1876 men and 820 women). The mean chronological age(CA) was 46.0 years and the mean BA was 44.7 years. Metabolic syndrome(MS) was diagnosed in 218 subjects(8.1%). The prevalence of overall colorectal adenoma was 23.1%(622/2,696). When the subjects were divided into four groups based on BA(≤ 39 years; 40-49 years; 50-59 years; ≥ 60 years), the prevalence of colorectal adenoma was increased as BA increased(P < 0.001). Colorectal adenoma located in the proximal colon was more prevalent in the BA-dominant group(BA-CA ≥ 5years) than the CA-dominant group(CA-BA ≥ 5 years)(P = 0.034). When the subjects were categorized into four groups according to MS and age gap between BA and CA, the incidence of colorectal adenoma increased with MS and BA-dominance(P < 0.05).CONCLUSION Measurement of BA may help to assess the risk of colorectal adenoma in screening colonoscopy.
