Regime Period Research Articles

Analysis of the temporal and spatial variability of the temperature and humidity regime of the spring-summer period in the south of Russia for the cultivation of fruit crops (on the example of the Stavropol Territory)

The normal growth and development of the fruit plant requires certain living conditions, primarily the optimal temperatures for the successful passage of all phases of ontogenesis during the year. The amount of precipitation is a very important indicator, although this factor (unlike temperature) can be regulated by irrigating. The North Caucasus is the main region of the country's fruit growing, especially for the cultivation of particularly valuable southern fruit crops. In all of its republics and the edges, critical temperatures of the winter-spring period of various forces, uncomfortable for harvesting fruit crops or even destructive are occupied. No less important factors in the south of Russia for the successful development of fruit growing are elevated summer period temperatures, exceeding them more than 30 °C suspends the processes of the development of seed and bone crops. Stavropol Territory differs from other ecological and geographical zones of the North Caucasus with frequent manifestation of such high temperatures during the growing season and disadvantage of falling precipitation (300-500 mm), which creates additional problems for crops, so all gardens in the Stavropol Territory require watering to create effective fruit production. Square of gardens of seed and bone cultures in recent years (2019, 2020) gradually increase in this zone. Solving the problem of environmental management when the climate change is currently requires an assessment of the time and spatial variability of the temperature and humidity regime in the expanding zones of gardening of the Stavropol Territory. It is also necessary for the optimal placement of various cultures and varieties of fruit crops.

A Cul-de-Sac or a Blazing Trail? The Significance and Long-Term Impact of the Numerus Clausus Legislation

ABSTRACT This essay discusses the origins and the short- and long-term consequences of Hungary’s numerus clausus legislation of 1920. The legislation enjoyed widespread support in the non-Jewish middle class and played an important role in the rise of a stable social coalition, which provided the backbone of popular support for the Horthy regime in the interwar period.

Bank lending and interest on excess reserves: An empirical investigation

This paper econometrically tests for effects on bank lending of the Federal Reserve’s policy of paying interest on excess reserves (IOER). Following the 2008 financial crisis, US banks decreased their loan allocations and increased holdings of excess reserves. A model of bank asset allocation shows that when the rate of IOER is higher than other short-term rates, banks will switch from zero excess reserves to a regime with higher excess reserves and lower lending. Using a sample of panel data on US banks from 2000 through 2018, we find evidence of a switch to a positive excess reserve regime in the post-crisis period. Controlling for market interest rates, loan demand, and economic activity, we find that IOER accounts for the majority of the decline in bank lending after the financial crisis.

Role of effective discharge on morphological changes for a regulated macrochannel river system

Effective discharge plays a major part in sediment and nutrient transport, landscape modification, and river restoration. However, a complete understanding of effective discharge is still missing because of heterogeneity in various fluvial processes. The present study investigates the role of effective discharge for suspended sediment transport in a regulated macrochannel river system, the Brahmani River, India. The natural flow-sediment regime and channel pattern of the Brahmani River have been altered by the Rengali dam. The effective discharge is estimated with both analytical and deterministic methods using long-term hydrological data. The results show the control of regulated flow and sediment regime in the post-dam period contributes to the reduction in effective discharge (1849 m3/s to 820 m3/s), where frequent moderate floods are able to transport a maximum portion of sediment load. An effective discharge integrated stream power curve is formulated, which accurately predicts the channel transition (from sinuous to weakly braided) in the post-dam period. Finally, the proposed probability of braiding captures the chute formation correctly, which further highlights the hierarchy of energy dissipation and morphological continuum in the Brahmani River.

THE EFFICIENCY OF CONTROL OF THE NUMBER OF RENAL CURRANT MITE (CECIDOPHYOPSIS RIBIS WESTW.) IN VARIETY AGROPHYTOCENOSIS OF BLACK CURRANT

The article reflects the results of studying the peculiarities of the development and formation of the number of a dangerous phytophage of black currant - the kidney mite (Cecidophyopsis ribis Westw.). A theoretical generalization of the prevalence of the pest in the research area, the study of the issue of its development cycle and the impact on the formation of the yield of black currant is made. The results of research by a number of authors on the relevance of research in this direction are summarized, highlighting relevant aspects of further research of measures to control and limit the number of kidney mites in modern intensive agrophytocenoses of black currant in Ukraine. The results of a general assessment of the influence of climatic factors during the research period on the favorableness of both the growth and development of black currant plants and fluctuations in the number of kidney currant mites, taking into account the hydrothermal regime of the vegetation period of plants and taking into account the biological characteristics of the life cycle of the phytophage, are presented. Based on the assessment of the population of the collection nursery of blackcurrant varieties, which includes 40 varieties of various ecological and geographical origin, the presence of sources of genotypic resistance of blackcurrant varieties to the kidney currant mite was studied, and conclusions were drawn about the differentiation of the studied varieties according to their prospects of use for the formation of resistant to the number of this pest cenoses in order to limit its number and reduce the level of pesticide load with obtaining berry products suitable for fresh consumption. The effectiveness of six variants of application of three acaricides, which are widespread in the practice of protecting black currant, in the format of three variants of the working concentration of the solution for each of the preparations has been investigated. The efficiency and feasibility of using each acaricide on a variety with minimal resistance to this phytophage and on the basis of a preliminary study of the population of the collection varieties by the pest and a decrease in the yield level of each of them in comparison with the level of population and damage control have been determined. On the basis of the long-term evaluation of using various compositions of the studied acaricides, the most effective option for the use of the acaricide Nissoran (Dr. Hexythiazox, 100 g / kg) with a working solution concentration of 0.6%, which ensures the maximum safety of the crop on the most unstable to the pest variety of black currant, has been established providing an increase in yield to control water treatment at the level of 229.5%. The attention has been focused on the prospect of further research in the option of studying the effectiveness of combining the use of classical acaricides with a number of biological products, as well as against the background of the use of foliar dressing of black currant with chelated micronutrient fertilizers in the context of the same collection of crop varieties corresponding to certain strategies for limiting the number of phytophages of agricultural crops, taking into account modern agrotechnological agricultural cultivation approaches.

Study of the water regime dynamics of cherry in the summer period

The research was carried out on the basis of the VNIISPK Laboratory of Fruit Plant Resistance Physiology in 2019-2020. The research object was the Novella cherry variety on the clonal rootstocks of the institute selection. The purpose of this research is to study the dynamics of the water regime of the Novella variety on clonal rootstocks and to identify the most adapted scion-rootstock cherry combinations. A strong relationship was determined between the cherry leaves hydration and the average daily air temperature (r = 0.99). During the ripening period of the fruits of the Novella variety scion-rootstock combinations, the maximum decrease in the total water in the leaves was recorded. The water content decreased as the age of the leaves increased. The decrease in water content in the Novella scion-rootstock combinations was accompanied by an increase in the dry matter content in the leaf tissues. There was a strong relationship between the dry matter accumulation in the leaves and the average daily air temperature (r = -0.99). The water deficit in the leaves depended on the hydrothermal regime of the summer period. Correlation (r = 0.76) between the leaves water deficit and the average daily air temperature, the amount of precipitation (r = -0.77) and the HTC (r = -0.83). The highest water deficiency indicator in leaves was found during shoots growth and formation of the leaf apparatus in the Novella variety on clonal rootstocks. The conducted studies allowed to identify adapted scion-rootstock combinations of Novella/Rubin, V-2-180, 74340, 74336, 74332, which, against the background of water content decrease and dry matter accumulation were characterized by the lowest water deficit of leaves in the summer.

FORECASTING OF SPRING WHEAT YIELD BY METEOROLOGICAL INDICATORS ON THE EXAMPLE OF THE TETYUSHSKY DISTRICT OF THE REPUBLIC OF TATARSTAN

The relationship between the spring wheat yield in the Tetyushsky municipal district of the Republic of Tatarstan and meteorological parameters characterizing the temperature and humidity regime in the 50-year period 1970-2019 is considered. A multiple regression equation is obtained, where the predictors are the yield of spring wheat, and the predictors are the average precipitation for may-June, the average amount of precipitation for the growing season (may-August), precipitation for the year and June, air temperature for June, and the average air temperature for the period may-June. Correlations were found between individual meteorological parameters, as well as between the actual yield and meteorological indicators. It is shown that meteorological conditions (precipitation and air temperature) of the spring-summer period (may-June) have the greatest impact on the crop. Analysis of the regression equations showed that there is a satisfactory agreement between the actual and calculated data on spring wheat yield, which allows using them for predictive purposes.

Çağdaş Görsel Sanatta Yeniden Üretim ve Sınırların Belirsizliğini Benjamin ve Adorno’nun İzinden Sürmek

İçinde bulunduğumuz çağın adını nasıl nitelendirirsek nitelendirelim, günümüzde her alanda bir parça yeniden üretim ve tekrarlama olduğunu inkâr etmemiz mümkün değildir. Çağdaş dönemin görsel rejimi, bir anlamda var olanı yeniden üretme ideolojisi üzerinden gerçekleşir. Bu bağlamda en önemli düşünürlerden Walter Benjamin ve Theodor Adorno’nun yeniden üretim yazıları başlangıç noktası olarak belirlenerek, aradan geçen yaklaşık seksen yılın ardından konunun günümüzde hangi noktaya geldiğine dair bir tartışma yapılmaktadır. İletişimi bir toplumsallaşma süreci olarak ele alırsak, bu sürecin alt sistemlerinden biri olan sanatın son dönemini tahlil etmek toplumsallaşmanın kendisini anlama adına önem kazanır. Dolayısıyla çalışmada çağdaş görsel sanat yapıtlarının son yüz yılından seçilen örnek çalışmalar, yeniden üretim bağlamında tartışılmaktadır. Çağdaş sanatın tekrarlama kapasitesinin yanı sıra, şok edicilik ve agresyon da önemli konvansiyonlardan biri olarak incelenmektedir. Bununla ilintili olarak gerek global düzeyde küreselleşme üzerinden gerekse sabit normların akışkanlaşması üzerinden düşünülerek, bunların çağdaş görsel sanatlardaki yansımaları bağlamında sınırların belirsizliği değerlendirilmeye çalışılmaktadır. Çalışma hem içerik hem de biçimsel olarak Benjamin’in ve Adorno’nun çalışmalarından ilham alarak yapılandırılmaya çalışılmaktadır. Görülebileceği gibi, çalışmanın bizatihi kendisi de self-refleksif bir şekilde yeniden üretim hakkında bir yeniden üretimdir. Arzulanan; nesnel ve genele dair betimleyici bir tasnifleme yapmak yerine, tıpkı Benjamin gibi numuneleri toplumsallıkları açısından analiz ederek, onların asıl bağlamlarına ulaşmaya çalışmaktır.

Enhanced recovery after surgery (ERAS) for the anaesthesiologist

Enhanced recovery after surgery (ERAS) protocol consists of entire spectrum of pre, intra and post-operative designed to enhance patient outcomes. Since its first introduction for major abdominal surgery in the 1990’s, ERAS protocols have been successfully used extensively in many countries in several major surgical procedures. When effectively implemented, ERAS resulted in reduction in hospitalization, improvement in satisfaction of the patients, and reduction in complication rate without an increase in re-admissions. Implementation of ERAS in India has also positively affected the patient experience and led to efficient utilization of valuable hospital resources.Many of the ERAS components are linked to the anaesthesia team. Anaesthesiologists help in preparing anaesthesia, they also ascertain the fasting regime in preoperative period, assess premedication, and introduce prophylaxis for post-operative nausea and vomiting (PONV). Intraoperatively, they introduce low sodium fluid therapy, help in preventing hypothermia, and utilize short acting drugs. They also help in important decision making during postoperative analgesia. An anaesthesiologist role is foremost important in the implementation of ERAS protocol. The article aims to discuss the various components of ERAS and the role of anaesthesiologist in implementing them.

Evaluation of integrated impacts of climate and land use change on the river flow regime in Wamkurumadzi River, Shire Basin in Malawi

Abstract Climate and land use change (CC and LUC hereafter) are interlinked factors that can lead to river flow regime changes, as well as affecting hydrological extremes such as floods and drought. There is now considerable evidence of CC and LUC in many catchments in Malawi but without corresponding evaluations of their impacts on river flow regimes. Therefore, this study assessed how both factors affect the flow regime of Wamkurumadzi River, a key tributary of the major Shire River in southern Malawi. Land use and hydroclimatic data for the basin were first analyzed for spatial–temporal trends in the historical period between the years 1984 and 2015. The Soil and Water Assessment Tool (SWAT) model was then applied with different LUC and CC scenarios in order to assess their sole and combined impacts on the river flow regime. The model was calibrated and validated using the split sample method from the year 1984 to 1999 and from the year 2000 to 2015. Model performance was acceptable according to the selected evaluation criteria, with the Nash–Sutcliffe (NSE) coefficient of 0.78 and coefficient of determination (R2) of 0.96 during calibration and NSE of 0.93 and R2 of 0.98 during validation. Results of the integrated impacts of LUC and CC suggest a slight increase in river discharge of 0.05 m3/s for the period between the 1980s and 2000s. During the 1980s–1990s, both CC through rainfall decreased and LUC resulted in decreases in the mean river discharges by 1.58 and 0.37 m3/s, respectively. The study also found that CC through increased rainfall in the 1990s–2000s decades saw an overall increase of 1.39 m3/s in mean river discharge, while LUC shows the increase of mean river discharge by 0.25 m3/s. However, the study observed that reforestation efforts in the basin were greatly responsible for the alteration of the river flow regime in the later period.

Development of a flotation recovery model with CFD predicted collision efficiency

In this study, a novel flotation recovery model based on a first-order kinetics is proposed. The collision efficiency in the recovery model was directly obtained from 3D computational fluid dynamics (CFD) simulations involving a single-bubble-multi-particle aggregate system with typical flotation operating conditions (bubble diameter of 1 mm and particles diameter of 30 μm). The effect of the fluctuating flow field on collision was accounted using a large eddy simulation (LES) turbulence model for two turbulence intensity cases namely 4% and 20%, respectively. It was noted that the collision efficiency decreased in the radial direction away from the symmetry axis of the bubble. The normalized equivalent critical radius K1 for the overall collision efficiency, was found to be optimum at the lower turbulence intensity of 4%. A maximum bubble surface loading, 0.142 was determined by fitting the model-predicted bubble velocity with available experimental data. With this maximum bubble surface loading constraint, the recovery model predicted two regimes namely a loading regime in the early flotation period and a saturated regime wherein the bubble loading capability was entirely exhausted. Simulation of a batch flotation system suggested that loss in bubble surface loading capacity occurred faster in a dense pulp compared to a dilute pulp system and the predicted recovery decreased with increasing solids concentration for the same gas volume fraction. Similar to the collision efficiency, the optimum recovery was obtained at Ti = 4%. Further, the model predicted recovery was compared to a lab scale coal flotation test and reasonable agreement was obtained.

An asynchronous solution to the synchronisation problem for binary one-dimensional cellular automata

Because cellular automata rely on totally local and synchronous processing at the neighbourhood of each cell, the issue of global synchronisation of the cell states has a long tradition in cellular automata literature. Here, the following benchmark synchronisation problem in the context of one-dimensional binary cellular automata rule is addressed: in periodic boundary condition, a rule needs to be conceived so as to lead any initial configuration to converge, at some time in future, to a cyclic regime of period 2 characterised by all cells alternating between fully homogeneous configurations of 0s and 1s. In spite of its simplicity, the problem has recently been shown not to have a solution by synchronously updating the cell states. In contrast, we provide a perfect solution to the problem, with a 4-neighbour rule, by replacing the synchronous update of the cells of the lattice with a deterministic, block sequential asynchronous update schedule. Achieving synchrony by asynchronous means represents an example that makes it evident the fact that asynchrony can be explored to give more freedom to the cells of a CA, in terms of the local information they exchange with each other. Since synchronisation phenomena and problems are pervasive in many contexts in science and engineering, it is a valuable resource to understand how synchronisation can be achieved and controlled in simple computational models, such as cellular automata.

Effect of temperature history on swelling behavior of V-Fe binary alloy irradiated in a fast reactor Joyo

Abstract An on-line instrumented material irradiation rig (MARICO-II) was used for investigating temperature history effect for void swelling behavior in V-Fe binary alloys irradiated at a fast rector, Joyo. Neutron irradiation were performed at 477C with 7.5 dpa in the temperature control capsule (TC capsule) and at 482C maximum temperature with 20.4 dpa in the conventional capsule with monitoring temperature. In the TC capsule, voids was formed and distributed homogeneously, on the other hand a lot of tiny void formation or bimodal void distribution were observed in the conventional capsule, The void swelling rate of V-Fe alloys irradiated in the TC capsule was larger than that in the conventional capsule and it is caused by the imbalance of point defect flux to sink due to void nucleation at the low temperature transient regime in start-up and shutdown period of each cycle in neutron irradiation, that is temperature history effect for swelling behavior of V-Fe binary alloys during neutron irradiation.

The Fed’s “Ample-Reserves” Approach to Implementing Monetary Policy

We describe the Federal Reserve’s (the Fed’s) approach to implementing monetary policy in an ample-reserves regime. We use a stylized model to explain the factors the Fed considers and the tools it uses to ensure interest rate control when the quantity of reserves is ample. Then, we take a close look at the Fed’s experience operating in this regime in the post-crisis period, both as it has raised and lowered its policy rate. Looking ahead, we highlight some considerations relevant for maintaining a level of reserves consistent with the efficient and effective implementation of monetary policy, and conclude with an overview of the benefits of an ample-reserves regime. This primer is intended to enhance discussions and understanding of the Fed’s actions and communications regarding monetary policy implementation, as many resources on this topic may be out of date given the recent evolution of the policy environment.

More Than Anti-Communism: The Cold War and the Meanings of Democracy in Taiwan

ABSTRACT Governments across anti-communist Asia, with US backing or tacit consent, devised institutions and practices for marginalising popular forces. Such internalisation of the Cold War involved measures ranging from violence and ideological mobilisation to disciplinary modes of control. With democratisation, Cold War devices for domestic control could remain entrenched or be rolled back. Examining the relationship between democratic transformation and the unwinding of Cold War practices in Taiwan can shed new light on democratic change in the region. While the Kuomintang regime of the martial law period had abundant resources for suppression, electoral politics was left relatively undisciplined by anti-communist meanings of democracy. The limited elections produced a new group within the political elite, who negotiated for a more open electoral landscape. The rules governing electoral politics in Taiwan today reflect the principles of pluralism and inclusiveness that were at the heart of that elite bargain. As far as control over electoral politics is concerned, and in so far as the electoral sphere’s growth is taken as significant, democratisation moved Taiwan out of the shadow of the Cold War’s internalisation. Comparison with South Korea clarifies an alternative form of change.

Effects of IFRS Adoption on the Financial Performance and Value of Listed Banks in Nigeria

This study examined the effect of IFRS adoption on the financial performance and value of the listed banks in Nigeria. Using a sample of 5 banks,(8 years observation) that have adopted the international financial reporting standard (IFRS) from 2012 to 2015 and pre-IFRS period from 2008 to 2011, we can investigate performance and value of the listed banks. As the main objective of the study, we introduced panel data analysis on Return on Asset, Return on Equity and earnings per share (EPS) and IFRS dummy variable as the independent variables into the model. The paper uses the Fixed Effect Model as the appropriate estimator for analysis of the data. The estimated coefficient on the regime period (RR) term is statistically insignificant and positive in the models. The results suggest that the adoption of IFRS in Nigeria has not lead to higher performance and increased value. Overall, results suggest that the findings of this study are utmost important financial analyst, policy-makers and concerned stakeholder to ensuring that all firms adopt IFRS and create easy access for comparability. This will enable relevant and reliable financial information to be passed to the capital market for investors to take an informed and relevant decision

Allegory and realistic regime criticism in the context of the relationship between literature and sociology

Toplumsal yapıda meydana gelen değişimleri ve
 sonuçlarını gözlemleyerek ortaya çıkan sosyal problemler üzerinde yorum yapan
 entelektüel, edebiyatçı, aydın ya da sanatçı, toplumda, toplumsal yaşamın
 dönüşümü ve etkileri konusunda bir farkındalık yaratma niyetiyle toplumsal
 fayda adına gözlemlerini kamuoyu ile paylaşır. Entelektüel, edebiyatçı, edebi
 eserin işlevsel niteliğini sanatsal niteliğinden daha ön plana çıkararak zaman
 zaman edebi eseri propaganda metnine zaman zaman da sistemi eleştiren edebî bir
 metine dönüştürebilir. Özellikle toplumların rejim değişikliği ile karşı
 karşıya kaldığı dönemde siyasetin sosyal yapı üzerindeki etkilerini konu edinen
 edebi eserlerin ve bu edebi eserleri veren sanatçıların dâhil olduğu edebî
 akımların ve sanat akımlarının ortaya çıkışı ve niteliği pek çok araştırmanın
 konusu olmuştur. Bu çalışmada farklı siyasi düşünceyi benimsemiş dönemin
 entelektüeli olarak kabul edilebilecek edebiyatçıların tek parti döneminin
 rejim eleştirisini yapan alegorik ve gerçekçi nitelikteki eserleri edebî eserin
 mevcut siyasi rejimi eleştirme niteliği ele alınarak incelenecektir. 

Пространственное распределение ихтиопланктона у Крымского полуострова в летний сезон 2013 г.

Проанализированы данные, полученные в пяти комплексных экспедициях НИС «Профессор Водяницкий», которые были проведены с мая по сентябрь 2013 г., в летний нерестовый сезон. Представлена динамика видового разнообразия и пространственного распределения ихтиопланктона в связи с особенностями гидрологического режима в различных районах шельфовых и открытых вод Чёрного моря у Крымского полуострова. В ихтиопланктоне идентифицированы 17 видов икринок и личинок рыб из 13 семейств. Количество видов в ихтиопланктоне было максимальным в июне. Средняя численность икринок и личинок за нерестовый сезон составляла 50,5 и 9,2 экз.·м-2 соответственно. Наибольшая численность икринок (109,9 экз.·м-2) и личинок (9,2 экз.·м-2) наблюдалась в июле. Преобладали икринки и личинки хамсы Engraulis encrasicolus (Linnaeus, 1758): их доля в открытых водах в разгар нерестового сезона достигала 96 и 94 % соответственно. Максимальные показатели индексов видового разнообразия и выровненности (значимости каждого вида) наблюдались в мае, когда доминантные виды только начинали нерест и их численность в ихтиопланктоне была сравнительно низкой. Индексы видового богатства достигали наибольших величин в июне, когда количество видов в ихтиопланктоне было максимальным. Видовой состав и пространственное распределение ихтиопланктона зависели от термогидродинамической структуры морских вод в районах исследований, а выживанию личинок рыб способствовало снижение прессинга желетелого планктона на их кормовую базу. Наиболее значимыми факторами, определяющими термогидродинамическую структуру моря в летний нерестовый сезон 2013 г., являлись: региональные особенности режима прогрева поверхности моря в весенне-летний период и его выхолаживания в осенний гидрологический сезон; адвективный вклад поверхностных течений (прежде всего Основного черноморского течения); сгонно-нагонные процессы в прибрежных районах; локальные термохалинные неоднородности в областях смешения распреснённых речных вод с шельфовыми в северо-западной части моря и азовоморских вод в Керченском предпроливье — с водами открытого моря.

ECOSYSTEM OF KULUNDINSKOE LAKE IN THE PERIOD OF DEMINERALIZATION

Research on hyperhaline lakes began in 1977. Commercial interest to Artemia (at the stage of cysts) as a starting feed for hydrobionts served as the basis for monitoring of hyper haline lakes in the Altai Territory. Kulundinskoe lake is recognized as one of the largest basins in the Kulundinskaya plain of Ob-Irtyshskoye interfluve with population of fairy shrimp Artemia Leach, 1819. Comprehensive hydrobiological surveys in the growing season (April-October) 2018 show the dynamics of phytoplankton, zooplankton and stages of Artemia salina development in Kulundinskoe Lake . The researchers analyzed the impact of temperature regime and water salinity in the vegetation period of 2018 on Artemia salina status and productivity of the basin. Water mineralization varied within 83.4 - 93.0 g/l, which indicates lower salts concentration in the leach compared to the average many-year value which is explained by the change of water regressive stage to transgressive one. Monitoring of hyperhaline basin in the vegetation period of 2018 showed a depressive status of Artemia salina development due to demineralization of the basin. At the beginning of vegetation period, the temperature regime was unfavorable for Artemia salina development in the lake. That resulted in low numbers of copepods. Due to depressive development of Artemia salina in Kulundinskoye Lake in the vegetation period of 2018, the basin is seen to have lost its economic relevance.

No plate tectonic shutdown in the early Paleoproterozoic: Constraints from the ca. 2.4 Ga granitoids in the Quanji Massif, NW China

The global plate tectonic regime in the early Paleoproterozoic period is highly debated. Granitoids bear key information to address such a debate. Petrological, geochemical and geochronological studies are conducted on two post-collisional granitoid plutons in the Quanji Massif, northwestern China, to investigate the tectonic regime during this period. The granitoids are composed of syenogranite, monzogranite, and granodiorite, with minor tonalite, which intruded into the Delingha and Hudesheng regions at ca. 2.39–2.37 Ga. These plutons are high-K I-type granitoids with variable Ga/Al ratios, showing some characteristics of A2-type granitoids. They are characterized by enrichment of LILEs and LREEs and depletion of Sr, P, Ti, and Eu. They show depleted Nd and Hf isotope signatures with whole rock εNd(t) = +0.7 to +4.8 and zircon εHf(t) = −1.0 to +7.8, indicating a juvenile crustal growth event at ca. 2.44–2.37 Ga. Our new results together with other coeval post-collisional granitoids in the Quanji Massif suggest that the protracted post-collisional magmatism at ca. 2.39–2.34 Ga occurred just after a short interval of subduction and generation of juvenile magmas before or around ca. 2.4 Ga. Collectively, the formation of these ca. 2.4–2.3 Ga granitoids in the Quanji Massif may correlate with coeval granitoids in the Tarim and North China cratons, and is broadly coeval with magmatism in several other cratons in the West African and Canadian Shields. Thus, the globally well-documented magmatism at early Paleoproterozoic, or Siderian, provides further information for filling up the age gap of the so-called plate tectonic “shutdown” in the early Paleoproterozoic period worldwide. The geologic record therefore suggests no Siderian shutdown of plate tectonics, but instead, continuous global subduction and generation of juvenile magmas from the Archean through the Paleoproterozoic.